tdepim/kmail/kmheaders.cpp

// -*- mode: C++; c-file-style: "gnu" -*-
// kmheaders.cpp

#include <config.h>

#include "kmheaders.h"
#include "headeritem.h"
using KMail::HeaderItem;

#include "kcursorsaver.h"
#include "kmcommands.h"
#include "kmmainwidget.h"
#include "kmfiltermgr.h"
#include "undostack.h"
#include "kmmsgdict.h"
#include "kmdebug.h"
#include "kmfoldertree.h"
#include "folderjob.h"
using KMail::FolderJob;
#include "actionscheduler.h"
using KMail::ActionScheduler;
#include "messagecopyhelper.h"
using KMail::MessageCopyHelper;
#include "broadcaststatus.h"
using KPIM::BroadcastStatus;
#include "progressmanager.h"
using KPIM::ProgressManager;
using KPIM::ProgressItem;
#include <maillistdrag.h>
#include "globalsettings.h"
using namespace KPIM;
#include "messageactions.h"

#include <kapplication.h>
#include <kaccelmanager.h>
#include <kglobalsettings.h>
#include <kmessagebox.h>
#include <kiconloader.h>
#include <kpopupmenu.h>
#include <kimageio.h>
#include <kconfig.h>
#include <klocale.h>
#include <kdebug.h>

#include <tqbuffer.h>
#include <tqeventloop.h>
#include <tqfile.h>
#include <tqheader.h>
#include <tqptrstack.h>
#include <tqptrqueue.h>
#include <tqpainter.h>
#include <tqtextcodec.h>
#include <tqstyle.h>
#include <tqlistview.h>

#include <mimelib/enum.h>
#include <mimelib/field.h>
#include <mimelib/mimepp.h>

#include <stdlib.h>
#include <errno.h>

#include "textsource.h"

TQPixmap* KMHeaders::pixNew = 0;
TQPixmap* KMHeaders::pixUns = 0;
TQPixmap* KMHeaders::pixDel = 0;
TQPixmap* KMHeaders::pixRead = 0;
TQPixmap* KMHeaders::pixRep = 0;
TQPixmap* KMHeaders::pixQueued = 0;
TQPixmap* KMHeaders::pixTodo = 0;
TQPixmap* KMHeaders::pixSent = 0;
TQPixmap* KMHeaders::pixFwd = 0;
TQPixmap* KMHeaders::pixFlag = 0;
TQPixmap* KMHeaders::pixWatched = 0;
TQPixmap* KMHeaders::pixIgnored = 0;
TQPixmap* KMHeaders::pixSpam = 0;
TQPixmap* KMHeaders::pixHam = 0;
TQPixmap* KMHeaders::pixFullySigned = 0;
TQPixmap* KMHeaders::pixPartiallySigned = 0;
TQPixmap* KMHeaders::pixUndefinedSigned = 0;
TQPixmap* KMHeaders::pixFullyEncrypted = 0;
TQPixmap* KMHeaders::pixPartiallyEncrypted = 0;
TQPixmap* KMHeaders::pixUndefinedEncrypted = 0;
TQPixmap* KMHeaders::pixEncryptionProblematic = 0;
TQPixmap* KMHeaders::pixSignatureProblematic = 0;
TQPixmap* KMHeaders::pixAttachment = 0;
TQPixmap* KMHeaders::pixInvitation = 0;
TQPixmap* KMHeaders::pixReadFwd = 0;
TQPixmap* KMHeaders::pixReadReplied = 0;
TQPixmap* KMHeaders::pixReadFwdReplied = 0;


//-----------------------------------------------------------------------------
KMHeaders::KMHeaders(KMMainWidget *aOwner, TQWidget *parent,
                     const char *name) :
  KListView( parent, name ),
  mIgnoreSortOrderChanges( false )
{
  static bool pixmapsLoaded = false;
  //qInitImageIO();
  KImageIO::registerFormats();
  mOwner  = aOwner;
  mFolder = 0;
  noRepaint = false;
  getMsgIndex = -1;
  mTopItem = 0;
  setSelectionMode( TQListView::Extended );
  setAllColumnsShowFocus( true );
  mNested = false;
  nestingPolicy = OpenUnread;
  mNestedOverride = false;
  mSubjThreading = true;
  mMousePressed = false;
  mSortInfo.dirty = true;
  mSortInfo.fakeSort = 0;
  mSortInfo.removed = 0;
  mSortInfo.column = 0;
  mSortCol = 2; // 2 == date
  mSortDescending = false;
  mSortInfo.ascending = false;
  mReaderWindowActive = false;
  mRoot = new SortCacheItem;
  mRoot->setId(-666); //mark of the root!
  setStyleDependantFrameWidth();
  // popup-menu
  header()->setClickEnabled(true);
  header()->installEventFilter(this);
  mPopup = new KPopupMenu(this);
  mPopup->insertTitle(i18n("View Columns"));
  mPopup->setCheckable(true);
  mPopup->insertItem(i18n("Status"),          KPaintInfo::COL_STATUS);
  mPopup->insertItem(i18n("Important"),       KPaintInfo::COL_IMPORTANT);
  mPopup->insertItem(i18n("Action Item"),     KPaintInfo::COL_TODO);
  mPopup->insertItem(i18n("Attachment"),      KPaintInfo::COL_ATTACHMENT);
  mPopup->insertItem(i18n("Invitation"),      KPaintInfo::COL_INVITATION);
  mPopup->insertItem(i18n("Spam/Ham"),        KPaintInfo::COL_SPAM_HAM);
  mPopup->insertItem(i18n("Watched/Ignored"), KPaintInfo::COL_WATCHED_IGNORED);
  mPopup->insertItem(i18n("Signature"),       KPaintInfo::COL_SIGNED);
  mPopup->insertItem(i18n("Encryption"),      KPaintInfo::COL_CRYPTO);
  mPopup->insertItem(i18n("Size"),            KPaintInfo::COL_SIZE);
  mPopup->insertItem(i18n("Receiver"),        KPaintInfo::COL_RECEIVER);

  connect(mPopup, TQT_SIGNAL(activated(int)), this, TQT_SLOT(slotToggleColumn(int)));

  setShowSortIndicator(true);
  setFocusPolicy( TQ_WheelFocus );

  if (!pixmapsLoaded)
  {
    pixmapsLoaded = true;
    pixNew                   = new TQPixmap( UserIcon( "kmmsgnew"                   ) );
    pixUns                   = new TQPixmap( UserIcon( "kmmsgunseen"                ) );
    pixDel                   = new TQPixmap( UserIcon( "kmmsgdel"                   ) );
    pixRead                  = new TQPixmap( UserIcon( "kmmsgread"                  ) );
    pixRep                   = new TQPixmap( UserIcon( "kmmsgreplied"               ) );
    pixQueued                = new TQPixmap( UserIcon( "kmmsgqueued"                ) );
    pixTodo                  = new TQPixmap( UserIcon( "kmmsgtodo"                  ) );
    pixSent                  = new TQPixmap( UserIcon( "kmmsgsent"                  ) );
    pixFwd                   = new TQPixmap( UserIcon( "kmmsgforwarded"             ) );
    pixFlag                  = new TQPixmap( UserIcon( "kmmsgflag"                  ) );
    pixWatched               = new TQPixmap( UserIcon( "kmmsgwatched"               ) );
    pixIgnored               = new TQPixmap( UserIcon( "kmmsgignored"               ) );
    pixSpam                  = new TQPixmap( UserIcon( "kmmsgspam"                  ) );
    pixHam                   = new TQPixmap( UserIcon( "kmmsgham"                   ) );
    pixFullySigned           = new TQPixmap( UserIcon( "kmmsgfullysigned"           ) );
    pixPartiallySigned       = new TQPixmap( UserIcon( "kmmsgpartiallysigned"       ) );
    pixUndefinedSigned       = new TQPixmap( UserIcon( "kmmsgundefinedsigned"       ) );
    pixFullyEncrypted        = new TQPixmap( UserIcon( "kmmsgfullyencrypted"        ) );
    pixPartiallyEncrypted    = new TQPixmap( UserIcon( "kmmsgpartiallyencrypted"    ) );
    pixUndefinedEncrypted    = new TQPixmap( UserIcon( "kmmsgundefinedencrypted"    ) );
    pixEncryptionProblematic = new TQPixmap( UserIcon( "kmmsgencryptionproblematic" ) );
    pixSignatureProblematic  = new TQPixmap( UserIcon( "kmmsgsignatureproblematic"  ) );
    pixAttachment            = new TQPixmap( UserIcon( "kmmsgattachment"            ) );
    pixInvitation            = new TQPixmap( UserIcon( "kmmsginvitation"            ) );
    pixReadFwd               = new TQPixmap( UserIcon( "kmmsgread_fwd"              ) );
    pixReadReplied           = new TQPixmap( UserIcon( "kmmsgread_replied"          ) );
    pixReadFwdReplied        = new TQPixmap( UserIcon( "kmmsgread_fwd_replied"      ) );
  }

  header()->setStretchEnabled( false );
  header()->setResizeEnabled( false );

  mPaintInfo.subCol      = addColumn( i18n("Subject"), 310 );
  mPaintInfo.senderCol   = addColumn( i18n("Sender"),  170 );
  mPaintInfo.dateCol     = addColumn( i18n("Date"),    170 );
  mPaintInfo.sizeCol     = addColumn( i18n("Size"),      0 );
  mPaintInfo.receiverCol = addColumn( i18n("Receiver"),  0 );

  mPaintInfo.statusCol         = addColumn( *pixNew           , "", 0 );
  mPaintInfo.importantCol      = addColumn( *pixFlag          , "", 0 );
  mPaintInfo.todoCol           = addColumn( *pixTodo          , "", 0 );
  mPaintInfo.attachmentCol     = addColumn( *pixAttachment    , "", 0 );
  mPaintInfo.invitationCol     = addColumn( *pixInvitation    , "", 0 );
  mPaintInfo.spamHamCol        = addColumn( *pixSpam          , "", 0 );
  mPaintInfo.watchedIgnoredCol = addColumn( *pixWatched       , "", 0 );
  mPaintInfo.signedCol         = addColumn( *pixFullySigned   , "", 0 );
  mPaintInfo.cryptoCol         = addColumn( *pixFullyEncrypted, "", 0 );

  setResizeMode( TQListView::NoColumn );

  // only the non-optional columns shall be resizeable
  header()->setResizeEnabled( true, mPaintInfo.subCol );
  header()->setResizeEnabled( true, mPaintInfo.senderCol );
  header()->setResizeEnabled( true, mPaintInfo.dateCol );

  connect( this, TQT_SIGNAL( contextMenuRequested( TQListViewItem*, const TQPoint &, int )),
           this, TQT_SLOT( rightButtonPressed( TQListViewItem*, const TQPoint &, int )));
  connect(this, TQT_SIGNAL(doubleClicked(TQListViewItem*)),
          this,TQT_SLOT(selectMessage(TQListViewItem*)));
  connect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
          this,TQT_SLOT(highlightMessage(TQListViewItem*)));
  resetCurrentTime();

  mSubjectLists.setAutoDelete( true );

  mMoveMessages = false;
  connect( this, TQT_SIGNAL(selectionChanged()), TQT_SLOT(updateActions()) );
}


//-----------------------------------------------------------------------------
KMHeaders::~KMHeaders ()
{
  if (mFolder)
  {
    writeFolderConfig();
    writeSortOrder();
    mFolder->close("kmheaders");
  }
  writeConfig();
  delete mRoot;
}

//-----------------------------------------------------------------------------
bool KMHeaders::eventFilter ( TQObject *o, TQEvent *e )
{
  if ( e->type() == TQEvent::MouseButtonPress &&
      TQT_TQMOUSEEVENT(e)->button() == Qt::RightButton &&
      o->isA(TQHEADER_OBJECT_NAME_STRING) )
  {
    // if we currently only show one of either sender/receiver column
    // modify the popup text in the way, that it displays the text of the other of the two
    if ( mPaintInfo.showReceiver )
      mPopup->changeItem(KPaintInfo::COL_RECEIVER, i18n("Receiver"));
    else
      if ( mFolder && (mFolder->whoField().lower() == "to") )
        mPopup->changeItem(KPaintInfo::COL_RECEIVER, i18n("Sender"));
      else
        mPopup->changeItem(KPaintInfo::COL_RECEIVER, i18n("Receiver"));

    mPopup->popup( TQT_TQMOUSEEVENT(e)->globalPos() );
    return true;
  }
  return KListView::eventFilter(o, e);
}

//-----------------------------------------------------------------------------

void KMHeaders::slotToggleColumn(int id, int mode)
{
  bool *show = 0;
  int  *col  = 0;
  int  width = 0;
  int moveToCol = -1;

  switch ( static_cast<KPaintInfo::ColumnIds>(id) )
  {
    case KPaintInfo::COL_SIZE:
    {
      show  = &mPaintInfo.showSize;
      col   = &mPaintInfo.sizeCol;
      width = 80;
      break;
    }
    case KPaintInfo::COL_ATTACHMENT:
    {
      show  = &mPaintInfo.showAttachment;
      col   = &mPaintInfo.attachmentCol;
      width = pixAttachment->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_INVITATION:
    {
      show  = &mPaintInfo.showInvitation;
      col   = &mPaintInfo.invitationCol;
      width = pixAttachment->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_IMPORTANT:
    {
      show  = &mPaintInfo.showImportant;
      col   = &mPaintInfo.importantCol;
      width = pixFlag->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_TODO:
    {
      show  = &mPaintInfo.showTodo;
      col   = &mPaintInfo.todoCol;
      width = pixTodo->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_SPAM_HAM:
    {
      show  = &mPaintInfo.showSpamHam;
      col   = &mPaintInfo.spamHamCol;
      width = pixSpam->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_WATCHED_IGNORED:
    {
      show  = &mPaintInfo.showWatchedIgnored;
      col   = &mPaintInfo.watchedIgnoredCol;
      width = pixWatched->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_STATUS:
    {
      show  = &mPaintInfo.showStatus;
      col   = &mPaintInfo.statusCol;
      width = pixNew->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_SIGNED:
    {
      show  = &mPaintInfo.showSigned;
      col   = &mPaintInfo.signedCol;
      width = pixFullySigned->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_CRYPTO:
    {
      show  = &mPaintInfo.showCrypto;
      col   = &mPaintInfo.cryptoCol;
      width = pixFullyEncrypted->width() + 8;
      if ( *col == header()->mapToIndex( *col ) )
        moveToCol = 0;
      break;
    }
    case KPaintInfo::COL_RECEIVER:
    {
      show  = &mPaintInfo.showReceiver;
      col   = &mPaintInfo.receiverCol;
      width = 170;
      break;
    }
    case KPaintInfo::COL_SCORE: ; // only used by KNode
    // don't use default, so that the compiler tells us you forgot to code here for a new column
  }

  assert(show);

  if (mode == -1)
    *show = !*show;
  else
    *show = mode;

  mPopup->setItemChecked(id, *show);

  if (*show) {
    header()->setResizeEnabled(true, *col);
    setColumnWidth(*col, width);
    if ( moveToCol >= 0 )
      header()->moveSection( *col, moveToCol );
  }
  else {
    header()->setResizeEnabled(false, *col);
    header()->setStretchEnabled(false, *col);
    hideColumn(*col);
  }

  // if we change the visibility of the receiver column,
  // the sender column has to show either the sender or the receiver
  if ( static_cast<KPaintInfo::ColumnIds>(id) ==  KPaintInfo::COL_RECEIVER ) {
    TQString colText = i18n( "Sender" );
    if ( mFolder && (mFolder->whoField().lower() == "to") && !mPaintInfo.showReceiver)
      colText = i18n( "Receiver" );
    setColumnText( mPaintInfo.senderCol, colText );
  }

  if (mode == -1)
    writeConfig();
}

//-----------------------------------------------------------------------------
// Support for backing pixmap
void KMHeaders::paintEmptyArea( TQPainter * p, const TQRect & rect )
{
  if (mPaintInfo.pixmapOn)
    p->drawTiledPixmap( rect.left(), rect.top(), rect.width(), rect.height(),
                        mPaintInfo.pixmap,
                        rect.left() + contentsX(),
                        rect.top() + contentsY() );
  else
    p->fillRect( rect, colorGroup().base() );
}

bool KMHeaders::event(TQEvent *e)
{
  bool result = KListView::event(e);
  if (e->type() == TQEvent::ApplicationPaletteChange)
  {
     readColorConfig();
  }
  return result;
}


//-----------------------------------------------------------------------------
void KMHeaders::readColorConfig (void)
{
  KConfig* config = KMKernel::config();
  // Custom/System colors
  KConfigGroupSaver saver(config, "Reader");
  TQColor c1=TQColor(kapp->palette().active().text());
  TQColor c2=TQColor("red");
  TQColor c3=TQColor("blue");
  TQColor c4=TQColor(kapp->palette().active().base());
  TQColor c5=TQColor(0,0x7F,0);
  TQColor c6=TQColor(0,0x98,0);
  TQColor c7=TDEGlobalSettings::alternateBackgroundColor();

  if (!config->readBoolEntry("defaultColors",true)) {
    mPaintInfo.colFore = config->readColorEntry("ForegroundColor",&c1);
    mPaintInfo.colBack = config->readColorEntry("BackgroundColor",&c4);
    TQPalette newPal = kapp->palette();
    newPal.setColor( TQColorGroup::Base, mPaintInfo.colBack );
    newPal.setColor( TQColorGroup::Text, mPaintInfo.colFore );
    setPalette( newPal );
    mPaintInfo.colNew = config->readColorEntry("NewMessage",&c2);
    mPaintInfo.colUnread = config->readColorEntry("UnreadMessage",&c3);
    mPaintInfo.colFlag = config->readColorEntry("FlagMessage",&c5);
    mPaintInfo.colTodo = config->readColorEntry("TodoMessage",&c6);
    c7 = config->readColorEntry("AltBackgroundColor",&c7);
  }
  else {
    mPaintInfo.colFore = c1;
    mPaintInfo.colBack = c4;
    TQPalette newPal = kapp->palette();
    newPal.setColor( TQColorGroup::Base, c4 );
    newPal.setColor( TQColorGroup::Text, c1 );
    setPalette( newPal );
    mPaintInfo.colNew = c2;
    mPaintInfo.colUnread = c3;
    mPaintInfo.colFlag = c5;
    mPaintInfo.colTodo = c6;
  }
  setAlternateBackground(c7);
}

//-----------------------------------------------------------------------------
void KMHeaders::readConfig (void)
{
  KConfig* config = KMKernel::config();

  // Backing pixmap support
  { // area for config group "Pixmaps"
    KConfigGroupSaver saver(config, "Pixmaps");
    TQString pixmapFile = config->readEntry("Headers");
    mPaintInfo.pixmapOn = false;
    if (!pixmapFile.isEmpty()) {
      mPaintInfo.pixmapOn = true;
      mPaintInfo.pixmap = TQPixmap( pixmapFile );
    }
  }

  { // area for config group "General"
    KConfigGroupSaver saver(config, "General");
    bool show = config->readBoolEntry("showMessageSize");
    slotToggleColumn(KPaintInfo::COL_SIZE, show);

    show = config->readBoolEntry("showAttachmentColumn");
    slotToggleColumn(KPaintInfo::COL_ATTACHMENT, show);

    show = config->readBoolEntry("showInvitationColumn");
    slotToggleColumn(KPaintInfo::COL_INVITATION, show);

    show = config->readBoolEntry("showImportantColumn");
    slotToggleColumn(KPaintInfo::COL_IMPORTANT, show);

    show = config->readBoolEntry("showTodoColumn");
    slotToggleColumn(KPaintInfo::COL_TODO, show);

    show = config->readBoolEntry("showSpamHamColumn");
    slotToggleColumn(KPaintInfo::COL_SPAM_HAM, show);

    show = config->readBoolEntry("showWatchedIgnoredColumn");
    slotToggleColumn(KPaintInfo::COL_WATCHED_IGNORED, show);

    show = config->readBoolEntry("showStatusColumn");
    slotToggleColumn(KPaintInfo::COL_STATUS, show);

    show = config->readBoolEntry("showSignedColumn");
    slotToggleColumn(KPaintInfo::COL_SIGNED, show);

    show = config->readBoolEntry("showCryptoColumn");
    slotToggleColumn(KPaintInfo::COL_CRYPTO, show);

    show = config->readBoolEntry("showReceiverColumn");
    slotToggleColumn(KPaintInfo::COL_RECEIVER, show);

    mPaintInfo.showCryptoIcons = config->readBoolEntry( "showCryptoIcons", false );
    mPaintInfo.showAttachmentIcon = config->readBoolEntry( "showAttachmentIcon", true );
    mPaintInfo.showInvitationIcon = config->readBoolEntry( "showInvitationIcon", false );

    KMime::DateFormatter::FormatType t =
      (KMime::DateFormatter::FormatType) config->readNumEntry("dateFormat", KMime::DateFormatter::Fancy ) ;
    mDate.setCustomFormat( config->readEntry("customDateFormat") );
    mDate.setFormat( t );
  }

  readColorConfig();

  // Custom/System fonts
  { // area for config group "General"
    KConfigGroupSaver saver(config, "Fonts");
    if (!(config->readBoolEntry("defaultFonts",true)))
    {
      TQFont listFont( TDEGlobalSettings::generalFont() );
      listFont = config->readFontEntry( "list-font", &listFont );
      setFont( listFont );
      mNewFont = config->readFontEntry( "list-new-font", &listFont );
      mUnreadFont = config->readFontEntry( "list-unread-font", &listFont );
      mImportantFont = config->readFontEntry( "list-important-font", &listFont );
      mTodoFont = config->readFontEntry( "list-todo-font", &listFont );
      mDateFont = TDEGlobalSettings::fixedFont();
      mDateFont = config->readFontEntry( "list-date-font", &mDateFont );
    } else {
      mNewFont= mUnreadFont = mImportantFont = mDateFont = mTodoFont =
        TDEGlobalSettings::generalFont();
      setFont( mDateFont );
    }
  }

  // Behavior
  {
    KConfigGroupSaver saver(config, "Geometry");
    mReaderWindowActive = config->readEntry( "readerWindowMode", "below" ) != "hide";
  }
}

//-----------------------------------------------------------------------------
void KMHeaders::restoreColumnLayout( KConfig *config, const TQString &group )
{
  // KListView::restoreLayout() will call setSorting(), which is reimplemented by us.
  // We don't want to change the sort order, so we set a flag here that is checked in
  // setSorting().
  mIgnoreSortOrderChanges = true;
  restoreLayout( config, group );
  mIgnoreSortOrderChanges = false;
}

//-----------------------------------------------------------------------------
void KMHeaders::reset()
{
  int top = topItemIndex();
  int id = currentItemIndex();
  noRepaint = true;
  clear();
  TQString colText = i18n( "Sender" );
  if ( mFolder && (mFolder->whoField().lower() == "to") && !mPaintInfo.showReceiver)
    colText = i18n( "Receiver" );
  setColumnText( mPaintInfo.senderCol, colText );
  noRepaint = false;
  mItems.resize(0);
  updateMessageList();
  setCurrentMsg(id);
  setTopItemByIndex(top);
  ensureCurrentItemVisible();
}

//-----------------------------------------------------------------------------
void KMHeaders::refreshNestedState(void)
{
  bool oldState = isThreaded();
  NestingPolicy oldNestPolicy = nestingPolicy;
  KConfig* config = KMKernel::config();
  KConfigGroupSaver saver(config, "Geometry");
  mNested = config->readBoolEntry( "nestedMessages", false );

  nestingPolicy = (NestingPolicy)config->readNumEntry( "nestingPolicy", OpenUnread );
  if ((nestingPolicy != oldNestPolicy) ||
    (oldState != isThreaded()))
  {
    setRootIsDecorated( nestingPolicy != AlwaysOpen && isThreaded() );
    reset();
  }

}

//-----------------------------------------------------------------------------
void KMHeaders::readFolderConfig (void)
{
  if (!mFolder) return;
  KConfig* config = KMKernel::config();

  KConfigGroupSaver saver(config, "Folder-" + mFolder->idString());
  mNestedOverride = config->readBoolEntry( "threadMessagesOverride", false );
  mSortCol = config->readNumEntry("SortColumn", mSortCol+1 /* inited to  date column */);
  mSortDescending = (mSortCol < 0);
  mSortCol = abs(mSortCol) - 1;

  mTopItem = config->readNumEntry("Top", 0);
  mCurrentItem = config->readNumEntry("Current", 0);
  mCurrentItemSerNum = config->readNumEntry("CurrentSerialNum", 0);

  mPaintInfo.orderOfArrival = config->readBoolEntry( "OrderOfArrival", false );
  mPaintInfo.status = config->readBoolEntry( "Status", false );

  { //area for config group "Geometry"
    KConfigGroupSaver saver(config, "Geometry");
    mNested = config->readBoolEntry( "nestedMessages", false );
    nestingPolicy = (NestingPolicy)config->readNumEntry( "nestingPolicy", OpenUnread );
  }

  setRootIsDecorated( nestingPolicy != AlwaysOpen && isThreaded() );
  mSubjThreading = config->readBoolEntry( "threadMessagesBySubject", true );
}


//-----------------------------------------------------------------------------
void KMHeaders::writeFolderConfig (void)
{
  if (!mFolder) return;
  KConfig* config = KMKernel::config();
  int mSortColAdj = mSortCol + 1;

  KConfigGroupSaver saver(config, "Folder-" + mFolder->idString());
  config->writeEntry("SortColumn", (mSortDescending ? -mSortColAdj : mSortColAdj));
  config->writeEntry("Top", topItemIndex());
  config->writeEntry("Current", currentItemIndex());
  HeaderItem* current = currentHeaderItem();
  ulong sernum = 0;
  if ( current && mFolder->getMsgBase( current->msgId() ) )
    sernum = mFolder->getMsgBase( current->msgId() )->getMsgSerNum();
  config->writeEntry("CurrentSerialNum", sernum);

  config->writeEntry("OrderOfArrival", mPaintInfo.orderOfArrival);
  config->writeEntry("Status", mPaintInfo.status);
}

//-----------------------------------------------------------------------------
void KMHeaders::writeConfig (void)
{
  KConfig* config = KMKernel::config();
  saveLayout(config, "Header-Geometry");
  KConfigGroupSaver saver(config, "General");
  config->writeEntry("showMessageSize"         , mPaintInfo.showSize);
  config->writeEntry("showAttachmentColumn"    , mPaintInfo.showAttachment);
  config->writeEntry("showInvitationColumn"    , mPaintInfo.showInvitation);
  config->writeEntry("showImportantColumn"     , mPaintInfo.showImportant);
  config->writeEntry("showTodoColumn"          , mPaintInfo.showTodo);
  config->writeEntry("showSpamHamColumn"       , mPaintInfo.showSpamHam);
  config->writeEntry("showWatchedIgnoredColumn", mPaintInfo.showWatchedIgnored);
  config->writeEntry("showStatusColumn"        , mPaintInfo.showStatus);
  config->writeEntry("showSignedColumn"        , mPaintInfo.showSigned);
  config->writeEntry("showCryptoColumn"        , mPaintInfo.showCrypto);
  config->writeEntry("showReceiverColumn"      , mPaintInfo.showReceiver);
}

//-----------------------------------------------------------------------------
void KMHeaders::setFolder( KMFolder *aFolder, bool forceJumpToUnread )
{
  CREATE_TIMER(set_folder);
  START_TIMER(set_folder);

  int id;
  TQString str;

  mSortInfo.fakeSort = 0;
  if ( mFolder && static_cast<KMFolder*>(mFolder) == aFolder ) {
    int top = topItemIndex();
    id = currentItemIndex();
    writeFolderConfig();
    readFolderConfig();
    updateMessageList(); // do not change the selection
    setCurrentMsg(id);
    setTopItemByIndex(top);
  } else {
    if (mFolder) {
    // WABA: Make sure that no KMReaderWin is still using a msg
    // from this folder, since it's msg's are about to be deleted.
      highlightMessage(0, false);

      disconnect(mFolder, TQT_SIGNAL(numUnreadMsgsChanged(KMFolder*)),
          this, TQT_SLOT(setFolderInfoStatus()));

      mFolder->markNewAsUnread();
      writeFolderConfig();
      disconnect(mFolder, TQT_SIGNAL(msgHeaderChanged(KMFolder*,int)),
                 this, TQT_SLOT(msgHeaderChanged(KMFolder*,int)));
      disconnect(mFolder, TQT_SIGNAL(msgAdded(int)),
                 this, TQT_SLOT(msgAdded(int)));
      disconnect(mFolder, TQT_SIGNAL( msgRemoved( int, TQString ) ),
                 this, TQT_SLOT( msgRemoved( int, TQString ) ) );
      disconnect(mFolder, TQT_SIGNAL(changed()),
                 this, TQT_SLOT(msgChanged()));
      disconnect(mFolder, TQT_SIGNAL(cleared()),
                 this, TQT_SLOT(folderCleared()));
      disconnect(mFolder, TQT_SIGNAL(expunged( KMFolder* )),
                 this, TQT_SLOT(folderCleared()));
      disconnect(mFolder, TQT_SIGNAL(closed()),
                 this, TQT_SLOT(folderClosed()));
      disconnect( mFolder, TQT_SIGNAL( statusMsg( const TQString& ) ),
                  BroadcastStatus::instance(), TQT_SLOT( setStatusMsg( const TQString& ) ) );
      disconnect(mFolder, TQT_SIGNAL(viewConfigChanged()), this, TQT_SLOT(reset()));
      writeSortOrder();
      mFolder->close("kmheaders");
      // System folders remain open but we also should write the index from
      // time to time
      if (mFolder->dirty()) mFolder->writeIndex();
    }

    mSortInfo.removed = 0;
    mFolder = aFolder;
    mSortInfo.dirty = true;

    mOwner->useAction()->setEnabled( mFolder ?
                         ( kmkernel->folderIsTemplates( mFolder ) ) : false );
    mOwner->messageActions()->replyListAction()->setEnabled( mFolder ?
                         mFolder->isMailingListEnabled() : false );
    if ( mFolder ) {
      connect(mFolder, TQT_SIGNAL(msgHeaderChanged(KMFolder*,int)),
              this, TQT_SLOT(msgHeaderChanged(KMFolder*,int)));
      connect(mFolder, TQT_SIGNAL(msgAdded(int)),
              this, TQT_SLOT(msgAdded(int)));
      connect(mFolder, TQT_SIGNAL(msgRemoved(int,TQString)),
              this, TQT_SLOT(msgRemoved(int,TQString)));
      connect(mFolder, TQT_SIGNAL(changed()),
              this, TQT_SLOT(msgChanged()));
      connect(mFolder, TQT_SIGNAL(cleared()),
              this, TQT_SLOT(folderCleared()));
      connect(mFolder, TQT_SIGNAL(expunged( KMFolder* )),
                 this, TQT_SLOT(folderCleared()));
      connect(mFolder, TQT_SIGNAL(closed()),
                 this, TQT_SLOT(folderClosed()));
      connect(mFolder, TQT_SIGNAL(statusMsg(const TQString&)),
              BroadcastStatus::instance(), TQT_SLOT( setStatusMsg( const TQString& ) ) );
      connect(mFolder, TQT_SIGNAL(numUnreadMsgsChanged(KMFolder*)),
          this, TQT_SLOT(setFolderInfoStatus()));
      connect(mFolder, TQT_SIGNAL(viewConfigChanged()), this, TQT_SLOT(reset()));

      // Not very nice, but if we go from nested to non-nested
      // in the folderConfig below then we need to do this otherwise
      // updateMessageList would do something unspeakable
      if (isThreaded()) {
        noRepaint = true;
        clear();
        noRepaint = false;
        mItems.resize( 0 );
      }

      readFolderConfig();

      CREATE_TIMER(kmfolder_open);
      START_TIMER(kmfolder_open);
      mFolder->open("kmheaders");
      END_TIMER(kmfolder_open);
      SHOW_TIMER(kmfolder_open);

      if (isThreaded()) {
        noRepaint = true;
        clear();
        noRepaint = false;
        mItems.resize( 0 );
      }
    }

    CREATE_TIMER(updateMsg);
    START_TIMER(updateMsg);
    updateMessageList(true, forceJumpToUnread);
    END_TIMER(updateMsg);
    SHOW_TIMER(updateMsg);
    makeHeaderVisible();
    setFolderInfoStatus();

    TQString colText = i18n( "Sender" );
    if (mFolder && (mFolder->whoField().lower() == "to") && !mPaintInfo.showReceiver)
      colText = i18n("Receiver");
    setColumnText( mPaintInfo.senderCol, colText);

    colText = i18n( "Date" );
    if (mPaintInfo.orderOfArrival)
      colText = i18n( "Order of Arrival" );
    setColumnText( mPaintInfo.dateCol, colText);

    colText = i18n( "Subject" );
    if (mPaintInfo.status)
      colText = colText + i18n( " (Status)" );
    setColumnText( mPaintInfo.subCol, colText);
  }

  updateActions();

  END_TIMER(set_folder);
  SHOW_TIMER(set_folder);
}

//-----------------------------------------------------------------------------
void KMHeaders::msgChanged()
{
  if (mFolder->count() == 0) { // Folder cleared
    mItems.resize(0);
    clear();
    return;
  }
  if (!isUpdatesEnabled()) return;

  // Remember selected messages, current message and some scrollbar data, as we have to restore it
  const TQValueList<int> oldSelectedItems = selectedItems();
  const int oldCurrentItemIndex = currentItemIndex();
  const bool scrollbarAtTop = verticalScrollBar() &&
                              verticalScrollBar()->value() == verticalScrollBar()->minValue();
  const bool scrollbarAtBottom = verticalScrollBar() &&
                                 verticalScrollBar()->value() == verticalScrollBar()->maxValue();
  const HeaderItem * const oldFirstVisibleItem = dynamic_cast<HeaderItem*>( itemAt( TQPoint( 0, 0 ) ) );
  const int oldOffsetOfFirstVisibleItem = itemRect( oldFirstVisibleItem ).y();
  const uint oldSerNumOfFirstVisibleItem = oldFirstVisibleItem ? oldFirstVisibleItem->msgSerNum() : 0;

  TQString msgIdMD5;
  TQListViewItem *item = currentItem();
  HeaderItem *hi = dynamic_cast<HeaderItem*>(item);
  if (item && hi) {
    // get the msgIdMD5 to compare it later
    KMMsgBase *mb = mFolder->getMsgBase(hi->msgId());
    if (mb)
      msgIdMD5 = mb->msgIdMD5();
  }
//  if (!isUpdatesEnabled()) return;
  // prevent IMAP messages from scrolling to top
  disconnect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
             this,TQT_SLOT(highlightMessage(TQListViewItem*)));

  updateMessageList(); // do not change the selection

  // Restore scrollbar state and selected and current messages
  setCurrentMsg( oldCurrentItemIndex );
  setSelectedByIndex( oldSelectedItems, true );
  if ( scrollbarAtTop ) {
    setContentsPos( 0, 0 );
  } else if ( scrollbarAtBottom ) {
    setContentsPos( 0, contentsHeight() );
  } else if ( oldSerNumOfFirstVisibleItem > 0 ) {
    for ( uint i = 0; i < mItems.size(); ++i ) {
      const KMMsgBase * const mMsgBase = mFolder->getMsgBase( i );
      if ( mMsgBase->getMsgSerNum() == oldSerNumOfFirstVisibleItem ) {
        setContentsPos( 0, itemPos( mItems[i] ) - oldOffsetOfFirstVisibleItem );
        break;
      }
    }
  }

  connect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
          this,TQT_SLOT(highlightMessage(TQListViewItem*)));

  // if the current message has changed then emit
  // the selected signal to force an update

  // Normally the serial number of the message would be
  // used to do this, but because we don't yet have
  // guaranteed serial numbers for IMAP messages fall back
  // to using the MD5 checksum of the msgId.
  item = currentItem();
  hi = dynamic_cast<HeaderItem*>(item);
  if (item && hi) {
    KMMsgBase *mb = mFolder->getMsgBase(hi->msgId());
    if (mb) {
      if (msgIdMD5.isEmpty() || (msgIdMD5 != mb->msgIdMD5()))
        emit selected(mFolder->getMsg(hi->msgId()));
    } else {
      emit selected(0);
    }
  } else
    emit selected(0);
}


//-----------------------------------------------------------------------------
void KMHeaders::msgAdded(int id)
{
  HeaderItem* hi = 0;
  if (!isUpdatesEnabled()) return;

  CREATE_TIMER(msgAdded);
  START_TIMER(msgAdded);

  assert( mFolder->getMsgBase( id ) ); // otherwise using count() is wrong

  /* Create a new SortCacheItem to be used for threading. */
  SortCacheItem *sci = new SortCacheItem;
  sci->setId(id);
  if (isThreaded()) {
    // make sure the id and subject dicts grow, if necessary
    if (mSortCacheItems.count() == (uint)mFolder->count()
        || mSortCacheItems.count() == 0) {
      kdDebug (5006) << "KMHeaders::msgAdded - Resizing id and subject trees of " << mFolder->label()
       << ": before=" << mSortCacheItems.count() << " ,after=" << (mFolder->count()*2) << endl;
      mSortCacheItems.resize(mFolder->count()*2);
      mSubjectLists.resize(mFolder->count()*2);
    }
    TQString msgId = mFolder->getMsgBase(id)->msgIdMD5();
    if (msgId.isNull())
      msgId = "";
    TQString replyToId = mFolder->getMsgBase(id)->replyToIdMD5();

    SortCacheItem *parent = findParent( sci );
    if (!parent && mSubjThreading) {
      parent = findParentBySubject( sci );
      if (parent && sci->isImperfectlyThreaded()) {
        // The parent we found could be by subject, in which case it is
        // possible, that it would be preferrable to thread it below us,
        // not the other way around. Check that. This is not only
        // cosmetic, as getting this wrong leads to circular threading.
        if (msgId == mFolder->getMsgBase(parent->item()->msgId())->replyToIdMD5()
         || msgId == mFolder->getMsgBase(parent->item()->msgId())->replyToAuxIdMD5())
          parent = NULL;
      }
    }

    if (parent && mFolder->getMsgBase(parent->id())->isWatched())
      mFolder->getMsgBase(id)->setStatus( KMMsgStatusWatched );
    else if (parent && mFolder->getMsgBase(parent->id())->isIgnored())
      mFolder->getMsgBase(id)->setStatus( KMMsgStatusIgnored );
    if (parent)
      hi = new HeaderItem( parent->item(), id );
    else
      hi = new HeaderItem( this, id );

    // o/` ... my buddy and me .. o/`
    hi->setSortCacheItem(sci);
    sci->setItem(hi);

    // Update and resize the id trees.
    mItems.resize( mFolder->count() );
    mItems[id] = hi;

    if ( !msgId.isEmpty() )
      mSortCacheItems.replace(msgId, sci);
    /* Add to the list of potential parents for subject threading. But only if
     * we are top level. */
    if (mSubjThreading && parent) {
      TQString subjMD5 = mFolder->getMsgBase(id)->strippedSubjectMD5();
      if (subjMD5.isEmpty()) {
        mFolder->getMsgBase(id)->initStrippedSubjectMD5();
        subjMD5 = mFolder->getMsgBase(id)->strippedSubjectMD5();
      }
      if( !subjMD5.isEmpty()) {
        if ( !mSubjectLists.find(subjMD5) )
          mSubjectLists.insert(subjMD5, new TQPtrList<SortCacheItem>());
        // insertion sort by date. See buildThreadTrees for details.
        int p=0;
        for (TQPtrListIterator<SortCacheItem> it(*mSubjectLists[subjMD5]);
            it.current(); ++it) {
          KMMsgBase *mb = mFolder->getMsgBase((*it)->id());
          if ( mb->date() < mFolder->getMsgBase(id)->date())
            break;
          p++;
        }
        mSubjectLists[subjMD5]->insert( p, sci);
        sci->setSubjectThreadingList( mSubjectLists[subjMD5] );
      }
    }
    // The message we just added might be a better parent for one of the as of
    // yet imperfectly threaded messages. Let's find out.

    /* In case the current item is taken during reparenting, prevent qlistview
     * from selecting some unrelated item as a result of take() emitting
     * currentChanged. */
    disconnect( this, TQT_SIGNAL(currentChanged(TQListViewItem*)),
           this, TQT_SLOT(highlightMessage(TQListViewItem*)));

    if ( !msgId.isEmpty() ) {
      TQPtrListIterator<HeaderItem> it(mImperfectlyThreadedList);
      HeaderItem *cur;
      while ( (cur = it.current()) ) {
        ++it;
        int tryMe = cur->msgId();
        // Check, whether our message is the replyToId or replyToAuxId of
        // this one. If so, thread it below our message, unless it is already
        // correctly threaded by replyToId.
        bool perfectParent = true;
        KMMsgBase *otherMsg = mFolder->getMsgBase(tryMe);
        if ( !otherMsg ) {
          kdDebug(5006) << "otherMsg is NULL !!! tryMe: " << tryMe << endl;
          continue;
        }
        TQString otherId = otherMsg->replyToIdMD5();
        if (msgId != otherId) {
          if (msgId != otherMsg->replyToAuxIdMD5())
            continue;
          else {
            if (!otherId.isEmpty() && mSortCacheItems.find(otherId))
              continue;
            else
              // Thread below us by aux id, but keep on the list of
              // imperfectly threaded messages.
              perfectParent = false;
          }
        }
        TQListViewItem *newParent = mItems[id];
        TQListViewItem *msg = mItems[tryMe];

        if (msg->parent())
          msg->parent()->takeItem(msg);
        else
          takeItem(msg);
        newParent->insertItem(msg);
        HeaderItem *hi = static_cast<HeaderItem*>( newParent );
        hi->sortCacheItem()->addSortedChild( cur->sortCacheItem() );

        makeHeaderVisible();

        if (perfectParent) {
          mImperfectlyThreadedList.removeRef (mItems[tryMe]);
          // The item was imperfectly thread before, now it's parent
          // is there. Update the .sorted file accordingly.
          TQString sortFile = KMAIL_SORT_FILE(mFolder);
          FILE *sortStream = fopen(TQFile::encodeName(sortFile), "r+");
          if (sortStream) {
            mItems[tryMe]->sortCacheItem()->updateSortFile( sortStream, mFolder );
            fclose (sortStream);
          }
        }
      }
    }
    // Add ourselves only now, to avoid circularity above.
    if (hi && hi->sortCacheItem()->isImperfectlyThreaded())
      mImperfectlyThreadedList.append(hi);
  } else {
    // non-threaded case
    hi = new HeaderItem( this, id );
    mItems.resize( mFolder->count() );
    mItems[id] = hi;
    // o/` ... my buddy and me .. o/`
    hi->setSortCacheItem(sci);
    sci->setItem(hi);
  }
  if (mSortInfo.fakeSort) {
    TQObject::disconnect(header(), TQT_SIGNAL(clicked(int)), this, TQT_SLOT(dirtySortOrder(int)));
    KListView::setSorting(mSortCol, !mSortDescending );
    mSortInfo.fakeSort = 0;
  }
  appendItemToSortFile(hi); //inserted into sorted list

  msgHeaderChanged(mFolder,id);

  if ((childCount() == 1) && hi) {
    setSelected( hi, true );
    setCurrentItem( firstChild() );
    setSelectionAnchor( currentItem() );
    highlightMessage( currentItem() );
  }

  /* restore signal */
  connect( this, TQT_SIGNAL(currentChanged(TQListViewItem*)),
           this, TQT_SLOT(highlightMessage(TQListViewItem*)));

  emit msgAddedToListView( hi );
  END_TIMER(msgAdded);
  SHOW_TIMER(msgAdded);
}


//-----------------------------------------------------------------------------
void KMHeaders::msgRemoved(int id, TQString msgId )
{
  if (!isUpdatesEnabled()) return;

  if ((id < 0) || (id >= (int)mItems.size()))
    return;
  /*
   * qlistview has its own ideas about what to select as the next
   * item once this one is removed. Sine we have already selected
   * something in prepare/finalizeMove that's counter productive
   */
  disconnect( this, TQT_SIGNAL(currentChanged(TQListViewItem*)),
              this, TQT_SLOT(highlightMessage(TQListViewItem*)));

  HeaderItem *removedItem = mItems[id];
  if (!removedItem) return;
  HeaderItem *curItem = currentHeaderItem();

  for (int i = id; i < (int)mItems.size() - 1; ++i) {
    mItems[i] = mItems[i+1];
    mItems[i]->setMsgId( i );
    mItems[i]->sortCacheItem()->setId( i );
  }

  mItems.resize( mItems.size() - 1 );

  if (isThreaded() && mFolder->count()) {
    if ( !msgId.isEmpty() && mSortCacheItems[msgId] ) {
      if (mSortCacheItems[msgId] == removedItem->sortCacheItem())
        mSortCacheItems.remove(msgId);
    }
    // Remove the message from the list of potential parents for threading by
    // subject.
    if ( mSubjThreading && removedItem->sortCacheItem()->subjectThreadingList() )
      removedItem->sortCacheItem()->subjectThreadingList()->removeRef( removedItem->sortCacheItem() );

    // Reparent children of item.
    TQListViewItem *myParent = removedItem;
    TQListViewItem *myChild = myParent->firstChild();
    TQListViewItem *threadRoot = myParent;
    while (threadRoot->parent())
      threadRoot = threadRoot->parent();
    TQString key = static_cast<HeaderItem*>(threadRoot)->key(mSortCol, !mSortDescending);

    TQPtrList<TQListViewItem> childList;
    while (myChild) {
      HeaderItem *item = static_cast<HeaderItem*>(myChild);
      // Just keep the item at top level, if it will be deleted anyhow
      if ( !item->aboutToBeDeleted() ) {
        childList.append(myChild);
      }
      myChild = myChild->nextSibling();
      if ( item->aboutToBeDeleted() ) {
        myParent->takeItem( item );
        insertItem( item );
        mRoot->addSortedChild( item->sortCacheItem() );
      }
      item->setTempKey( key + item->key( mSortCol, !mSortDescending ));
      if (mSortInfo.fakeSort) {
        TQObject::disconnect(header(), TQT_SIGNAL(clicked(int)), this, TQT_SLOT(dirtySortOrder(int)));
        KListView::setSorting(mSortCol, !mSortDescending );
        mSortInfo.fakeSort = 0;
      }
    }

    for (TQPtrListIterator<TQListViewItem> it(childList); it.current() ; ++it ) {
      TQListViewItem *lvi = *it;
      HeaderItem *item = static_cast<HeaderItem*>(lvi);
      SortCacheItem *sci = item->sortCacheItem();
      SortCacheItem *parent = findParent( sci );
      if ( !parent && mSubjThreading )
        parent = findParentBySubject( sci );

      Q_ASSERT( !parent || parent->item() != removedItem );
      myParent->takeItem(lvi);
      if ( parent && parent->item() != item && parent->item() != removedItem ) {
        parent->item()->insertItem(lvi);
        parent->addSortedChild( sci );
      } else {
        insertItem(lvi);
        mRoot->addSortedChild( sci );
      }

      if ((!parent || sci->isImperfectlyThreaded())
                      && !mImperfectlyThreadedList.containsRef(item))
        mImperfectlyThreadedList.append(item);

      if (parent && !sci->isImperfectlyThreaded()
          && mImperfectlyThreadedList.containsRef(item))
        mImperfectlyThreadedList.removeRef(item);
    }
  }
  // Make sure our data structures are cleared.
  if (!mFolder->count())
      folderCleared();

  mImperfectlyThreadedList.removeRef( removedItem );
#ifdef DEBUG
  // This should never happen, in this case the folders are inconsistent.
  while ( mImperfectlyThreadedList.findRef( removedItem ) != -1 ) {
    mImperfectlyThreadedList.remove();
    kdDebug(5006) << "Remove doubled item from mImperfectlyThreadedList: " << removedItem << endl;
  }
#endif
  delete removedItem;
  // we might have rethreaded it, in which case its current state will be lost
  if ( curItem ) {
    if ( curItem != removedItem ) {
      setCurrentItem( curItem );
      setSelectionAnchor( currentItem() );
    } else {
      // We've removed the current item, which means it was removed from
      // something other than a user move or copy, which would have selected
      // the next logical mail. This can happen when the mail is deleted by
      // a filter, or some other behind the scenes action. Select something
      // sensible, then, and make sure the reader window is cleared.
      emit maybeDeleting();
      int contentX, contentY;
      HeaderItem *nextItem = prepareMove( &contentX, &contentY );
      finalizeMove( nextItem, contentX, contentY );
    }
  }
  /* restore signal */
  connect( this, TQT_SIGNAL(currentChanged(TQListViewItem*)),
           this, TQT_SLOT(highlightMessage(TQListViewItem*)));
}


//-----------------------------------------------------------------------------
void KMHeaders::msgHeaderChanged(KMFolder*, int msgId)
{
  if (msgId<0 || msgId >= (int)mItems.size() || !isUpdatesEnabled()) return;
  HeaderItem *item = mItems[msgId];
  if (item) {
    item->irefresh();
    item->repaint();
  }
}


//-----------------------------------------------------------------------------
void KMHeaders::setMsgStatus (KMMsgStatus status, bool toggle)
{
  //  kdDebug() << k_funcinfo << endl;
  SerNumList serNums = selectedVisibleSernums();
  if (serNums.empty())
    return;

  KMCommand *command = new KMSeStatusCommand( status, serNums, toggle );
  command->start();
}


TQPtrList<TQListViewItem> KMHeaders::currentThread() const
{
  if (!mFolder) return TQPtrList<TQListViewItem>();

  // starting with the current item...
  TQListViewItem *curItem = currentItem();
  if (!curItem) return TQPtrList<TQListViewItem>();

  // ...find the top-level item:
  TQListViewItem *topOfThread = curItem;
  while ( topOfThread->parent() )
    topOfThread = topOfThread->parent();

  // collect the items in this thread:
  TQPtrList<TQListViewItem> list;
  TQListViewItem *topOfNextThread = topOfThread->nextSibling();
  for ( TQListViewItemIterator it( topOfThread ) ;
        it.current() && it.current() != topOfNextThread ; ++it )
    list.append( it.current() );
  return list;
}

void KMHeaders::setThreadStatus(KMMsgStatus status, bool toggle)
{
  TQPtrList<TQListViewItem> curThread;

  if (mFolder) {
    TQPtrList<TQListViewItem> topOfThreads;

    // for each selected item...
    for (TQListViewItem *item = firstChild(); item; item = item->itemBelow())
      if (item->isSelected() ) {
        // ...find the top-level item:
        TQListViewItem *top = item;
        while ( top->parent() )
          top = top->parent();
        if (!topOfThreads.contains(top)) {
          topOfThreads.append(top);
        }
      }

    // for each thread found...
    for ( TQPtrListIterator<TQListViewItem> it( topOfThreads ) ;
          it.current() ; ++ it ) {
        TQListViewItem *top = *it;

        // collect the items in this thread:
        TQListViewItem *topOfNextThread = top->nextSibling();
        for ( TQListViewItemIterator it( top ) ;
              it.current() && it.current() != topOfNextThread ; ++it )
          curThread.append( it.current() );
    }
  }

  TQPtrListIterator<TQListViewItem> it( curThread );
  SerNumList serNums;

  for ( it.toFirst() ; it.current() ; ++it ) {
    int id = static_cast<HeaderItem*>(*it)->msgId();
    KMMsgBase *msgBase = mFolder->getMsgBase( id );
    serNums.append( msgBase->getMsgSerNum() );
  }

  if (serNums.empty())
    return;

  KMCommand *command = new KMSeStatusCommand( status, serNums, toggle );
  command->start();
}

//-----------------------------------------------------------------------------
int KMHeaders::slotFilterMsg(KMMessage *msg)
{
  if ( !msg ) return 2; // messageRetrieve(0) is always possible
  msg->setTransferInProgress(false);
  int filterResult = kmkernel->filterMgr()->process(msg,KMFilterMgr::Explicit);
  if (filterResult == 2) {
    // something went horribly wrong (out of space?)
    kmkernel->emergencyExit( i18n("Unable to process messages: " ) + TQString::fromLocal8Bit(strerror(errno)));
    return 2;
  }
  if (msg->parent()) { // unGet this msg
    int idx = -1;
    KMFolder * p = 0;
    KMMsgDict::instance()->getLocation( msg, &p, &idx );
    assert( p == msg->parent() ); assert( idx >= 0 );
    p->unGetMsg( idx );
  }

  return filterResult;
}


void KMHeaders::slotExpandOrCollapseThread( bool expand )
{
  if ( !isThreaded() ) return;
  // find top-level parent of currentItem().
  TQListViewItem *item = currentItem();
  if ( !item ) return;
  clearSelection();
  item->setSelected( true );
  while ( item->parent() )
    item = item->parent();
  HeaderItem * hdrItem = static_cast<HeaderItem*>(item);
  hdrItem->setOpenRecursive( expand );
  if ( !expand ) // collapse can hide the current item:
    setCurrentMsg( hdrItem->msgId() );
  ensureItemVisible( currentItem() );
}

void KMHeaders::slotExpandOrCollapseAllThreads( bool expand )
{
  if ( !isThreaded() ) return;

  TQListViewItem * item = currentItem();
  if( item ) {
    clearSelection();
    item->setSelected( true );
  }

  for ( TQListViewItem *item = firstChild() ;
        item ; item = item->nextSibling() )
    static_cast<HeaderItem*>(item)->setOpenRecursive( expand );
  if ( !expand ) { // collapse can hide the current item:
    TQListViewItem * item = currentItem();
    if( item ) {
      while ( item->parent() )
        item = item->parent();
      setCurrentMsg( static_cast<HeaderItem*>(item)->msgId() );
    }
  }
  ensureItemVisible( currentItem() );
}

//-----------------------------------------------------------------------------
void KMHeaders::setStyleDependantFrameWidth()
{
  // set the width of the frame to a reasonable value for the current GUI style
  int frameWidth;
  if( style().isA("KeramikStyle") )
    frameWidth = style().pixelMetric( TQStyle::PM_DefaultFrameWidth ) - 1;
  else
    frameWidth = style().pixelMetric( TQStyle::PM_DefaultFrameWidth );
  if ( frameWidth < 0 )
    frameWidth = 0;
  if ( frameWidth != lineWidth() )
    setLineWidth( frameWidth );
}

//-----------------------------------------------------------------------------
void KMHeaders::styleChange( TQStyle& oldStyle )
{
  setStyleDependantFrameWidth();
  KListView::styleChange( oldStyle );
}

//-----------------------------------------------------------------------------
void KMHeaders::setFolderInfoStatus ()
{
  if ( !mFolder ) return;
  TQString str;
  const int unread = mFolder->countUnread();
  if ( static_cast<KMFolder*>(mFolder) == kmkernel->outboxFolder() )
    str = unread ? i18n( "1 unsent", "%n unsent", unread ) : i18n( "0 unsent" );
  else
    str = unread ? i18n( "1 unread", "%n unread", unread ) : i18n( "0 unread" );
  const int count = mFolder->count();
  str = count ? i18n( "1 message, %1.", "%n messages, %1.", count ).arg( str )
              : i18n( "0 messages" ); // no need for "0 unread" to be added here
  if ( mFolder->isReadOnly() )
    str = i18n("%1 = n messages, m unread.", "%1 Folder is read-only.").arg( str );
  BroadcastStatus::instance()->setStatusMsg(str);
}

//-----------------------------------------------------------------------------
void KMHeaders::applyFiltersOnMsg()
{
  if (ActionScheduler::isEnabled() ||
      kmkernel->filterMgr()->atLeastOneOnlineImapFolderTarget()) {
    // uses action scheduler
    KMFilterMgr::FilterSet set = KMFilterMgr::Explicit;
    TQValueList<KMFilter*> filters = kmkernel->filterMgr()->filters();
    ActionScheduler *scheduler = new ActionScheduler( set, filters, this );
    scheduler->setAutoDestruct( true );

    int contentX, contentY;
    HeaderItem *nextItem = prepareMove( &contentX, &contentY );
    TQPtrList<KMMsgBase> msgList = *selectedMsgs(true);
    finalizeMove( nextItem, contentX, contentY );

    for (KMMsgBase *msg = msgList.first(); msg; msg = msgList.next())
      scheduler->execFilters( msg );
  } else {
    int contentX, contentY;
    HeaderItem *nextItem = prepareMove( &contentX, &contentY );

    //prevent issues with stale message pointers by using serial numbers instead
    TQValueList<unsigned long> serNums = KMMsgDict::serNumList( *selectedMsgs() );
    if ( serNums.isEmpty() )
      return;

    finalizeMove( nextItem, contentX, contentY );
    CREATE_TIMER(filter);
    START_TIMER(filter);

    KCursorSaver busy( KBusyPtr::busy() );
    int msgCount = 0;
    int msgCountToFilter = serNums.count();
    ProgressItem* progressItem =
      ProgressManager::createProgressItem( "filter"+ProgressManager::getUniqueID(),
                                           i18n( "Filtering messages" ) );
    progressItem->setTotalItems( msgCountToFilter );

    for ( TQValueList<unsigned long>::ConstIterator it = serNums.constBegin();
          it != serNums.constEnd(); ++it ) {
      msgCount++;
      if ( msgCountToFilter - msgCount < 10 || !( msgCount % 20 ) || msgCount <= 10 ) {
        progressItem->updateProgress();
        TQString statusMsg = i18n("Filtering message %1 of %2");
        statusMsg = statusMsg.arg( msgCount ).arg( msgCountToFilter );
        KPIM::BroadcastStatus::instance()->setStatusMsg( statusMsg );
        TDEApplication::kApplication()->eventLoop()->processEvents( TQEventLoop::ExcludeUserInput, 50 );
      }

      KMFolder *folder = 0;
      int idx;
      KMMsgDict::instance()->getLocation( *it, &folder, &idx );
      KMMessage *msg = 0;
      if (folder)
        msg = folder->getMsg(idx);
      if (msg) {
        if (msg->transferInProgress())
          continue;
        msg->setTransferInProgress(true);
        if (!msg->isComplete()) {
          FolderJob *job = mFolder->createJob(msg);
          connect(job, TQT_SIGNAL(messageRetrieved(KMMessage*)),
                  this, TQT_SLOT(slotFilterMsg(KMMessage*)));
          job->start();
        } else {
          if (slotFilterMsg(msg) == 2)
            break;
        }
      } else {
        kdDebug (5006) << "####### KMHeaders::applyFiltersOnMsg -"
                          " A message went missing during filtering " << endl;
      }
      progressItem->incCompletedItems();
    }
    progressItem->setComplete();
    progressItem = 0;
    END_TIMER(filter);
    SHOW_TIMER(filter);
  }
}


//-----------------------------------------------------------------------------
void KMHeaders::setMsgRead (int msgId)
{
  KMMsgBase *msgBase = mFolder->getMsgBase( msgId );
  if (!msgBase)
    return;

  SerNumList serNums;
  if (msgBase->isNew() || msgBase->isUnread()) {
    serNums.append( msgBase->getMsgSerNum() );
  }

  KMCommand *command = new KMSeStatusCommand( KMMsgStatusRead, serNums );
  command->start();
}


//-----------------------------------------------------------------------------
void KMHeaders::deleteMsg ()
{
  //make sure we have an associated folder (root of folder tree does not).
  if (!mFolder)
    return;

  int contentX, contentY;
  HeaderItem *nextItem = prepareMove( &contentX, &contentY );
  KMMessageList msgList = *selectedMsgs(true);
  finalizeMove( nextItem, contentX, contentY );

  KMCommand *command = new KMDeleteMsgCommand( mFolder, msgList );
  connect( command, TQT_SIGNAL( completed( KMCommand * ) ),
           this, TQT_SLOT( slotMoveCompleted( KMCommand * ) ) );
  command->start();

  BroadcastStatus::instance()->setStatusMsg("");
  //  triggerUpdate();
}


//-----------------------------------------------------------------------------
void KMHeaders::moveSelectedToFolder( int menuId )
{
  if (mMenuToFolder[menuId])
    moveMsgToFolder( mMenuToFolder[menuId] );
}

//-----------------------------------------------------------------------------
HeaderItem* KMHeaders::prepareMove( int *contentX, int *contentY )
{
  HeaderItem *ret = 0;
  emit maybeDeleting();

  disconnect( this, TQT_SIGNAL(currentChanged(TQListViewItem*)),
              this, TQT_SLOT(highlightMessage(TQListViewItem*)));

  TQListViewItem *curItem;
  HeaderItem *item;
  curItem = currentItem();
  while (curItem && curItem->isSelected() && curItem->itemBelow())
    curItem = curItem->itemBelow();
  while (curItem && curItem->isSelected() && curItem->itemAbove())
    curItem = curItem->itemAbove();
  item = static_cast<HeaderItem*>(curItem);

  *contentX = contentsX();
  *contentY = contentsY();

  if (item  && !item->isSelected())
    ret = item;

  return ret;
}

//-----------------------------------------------------------------------------
void KMHeaders::finalizeMove( HeaderItem *item, int contentX, int contentY )
{
  emit selected( 0 );
  clearSelection();

  if ( item ) {
    setCurrentItem( item );
    setSelected( item, true );
    setSelectionAnchor( currentItem() );
    mPrevCurrent = 0;
    highlightMessage( item, false);
  }

  setContentsPos( contentX, contentY );
  makeHeaderVisible();
  connect( this, TQT_SIGNAL(currentChanged(TQListViewItem*)),
           this, TQT_SLOT(highlightMessage(TQListViewItem*)));
}


//-----------------------------------------------------------------------------
void KMHeaders::moveMsgToFolder ( KMFolder* destFolder, bool askForConfirmation )
{
  if ( destFolder == mFolder ) return; // Catch the noop case
  if ( mFolder->isReadOnly() ) return;

  KMMessageList msgList = *selectedMsgs();
  if ( msgList.isEmpty() ) return;
  if ( !destFolder && askForConfirmation &&    // messages shall be deleted
       KMessageBox::warningContinueCancel(this,
         i18n("<qt>Do you really want to delete the selected message?<br>"
              "Once deleted, it cannot be restored.</qt>",
              "<qt>Do you really want to delete the %n selected messages?<br>"
              "Once deleted, they cannot be restored.</qt>", msgList.count() ),
	 msgList.count()>1 ? i18n("Delete Messages") : i18n("Delete Message"), KStdGuiItem::del(),
	 "NoConfirmDelete") == KMessageBox::Cancel )
    return;  // user canceled the action

  // remember the message to select afterwards
  int contentX, contentY;
  HeaderItem *nextItem = prepareMove( &contentX, &contentY );
  msgList = *selectedMsgs(true);
  finalizeMove( nextItem, contentX, contentY );

  KMCommand *command = new KMMoveCommand( destFolder, msgList );
  connect( command, TQT_SIGNAL( completed( KMCommand * ) ),
           this, TQT_SLOT( slotMoveCompleted( KMCommand * ) ) );
  command->start();
}

void KMHeaders::slotMoveCompleted( KMCommand *command )
{
  kdDebug(5006) << k_funcinfo << command->result() << endl;
  bool deleted = static_cast<KMMoveCommand *>( command )->destFolder() == 0;
  if ( command->result() == KMCommand::OK ) {
    // make sure the current item is shown
    makeHeaderVisible();
    BroadcastStatus::instance()->setStatusMsg(
       deleted ? i18n("Messages deleted successfully.") : i18n("Messages moved successfully") );
  } else {
    /* The move failed or the user canceled it; reset the state of all
     * messages involved and repaint.
     *
     * Note: This potentially resets too many items if there is more than one
     *       move going on. Oh well, I suppose no animals will be harmed.
     * */
    for (TQListViewItemIterator it(this); it.current(); it++) {
      HeaderItem *item = static_cast<HeaderItem*>(it.current());
      if ( item->aboutToBeDeleted() ) {
        item->setAboutToBeDeleted ( false );
        item->setSelectable ( true );
        KMMsgBase *msgBase = mFolder->getMsgBase(item->msgId());
        if ( msgBase->isMessage() ) {
          KMMessage *msg = static_cast<KMMessage *>(msgBase);
          if ( msg ) msg->setTransferInProgress( false, true );
        }
      }
    }
    triggerUpdate();
    if ( command->result() == KMCommand::Failed )
      BroadcastStatus::instance()->setStatusMsg(
           deleted ? i18n("Deleting messages failed.") : i18n("Moving messages failed.") );
    else
      BroadcastStatus::instance()->setStatusMsg(
           deleted ? i18n("Deleting messages canceled.") : i18n("Moving messages canceled.") );
 }
 mOwner->updateMessageActions();
}

bool KMHeaders::canUndo() const
{
    return ( kmkernel->undoStack()->size() > 0 );
}

//-----------------------------------------------------------------------------
void KMHeaders::undo()
{
  kmkernel->undoStack()->undo();
}

//-----------------------------------------------------------------------------
void KMHeaders::copySelectedToFolder(int menuId )
{
  if (mMenuToFolder[menuId])
    copyMsgToFolder( mMenuToFolder[menuId] );
}


//-----------------------------------------------------------------------------
void KMHeaders::copyMsgToFolder(KMFolder* destFolder, KMMessage* aMsg)
{
  if ( !destFolder )
    return;

  KMCommand * command = 0;
  if (aMsg)
    command = new KMCopyCommand( destFolder, aMsg );
  else {
    KMMessageList msgList = *selectedMsgs();
    command = new KMCopyCommand( destFolder, msgList );
  }

  command->start();
}


//-----------------------------------------------------------------------------
void KMHeaders::setCurrentMsg(int cur)
{
  if (!mFolder) return;
  if (cur >= mFolder->count()) cur = mFolder->count() - 1;
  if ((cur >= 0) && (cur < (int)mItems.size())) {
    clearSelection();
    setCurrentItem( mItems[cur] );
    setSelected( mItems[cur], true );
    setSelectionAnchor( currentItem() );
  }
  makeHeaderVisible();
  setFolderInfoStatus();
}

//-----------------------------------------------------------------------------
void KMHeaders::setSelected( TQListViewItem *item, bool selected )
{
  if ( !item )
    return;

  if ( item->isVisible() )
    KListView::setSelected( item, selected );

  // If the item is the parent of a closed thread recursively select
  // children .
  if ( isThreaded() && !item->isOpen() && item->firstChild() ) {
      TQListViewItem *nextRoot = item->itemBelow();
      TQListViewItemIterator it( item->firstChild() );
      for( ; (*it) != nextRoot; ++it ) {
        if ( (*it)->isVisible() )
           (*it)->setSelected( selected );
      }
  }
}

void KMHeaders::setSelectedByIndex( TQValueList<int> items, bool selected )
{
  for ( TQValueList<int>::Iterator it = items.begin(); it != items.end(); ++it )
  {
    if ( ((*it) >= 0) && ((*it) < (int)mItems.size()) )
    {
      setSelected( mItems[(*it)], selected );
    }
  }
}

void KMHeaders::clearSelectableAndAboutToBeDeleted( TQ_UINT32 serNum )
{
  // fugly, but I see no way around it
  for (TQListViewItemIterator it(this); it.current(); it++) {
    HeaderItem *item = static_cast<HeaderItem*>(it.current());
    if ( item->aboutToBeDeleted() ) {
      KMMsgBase *msgBase = mFolder->getMsgBase( item->msgId() );
      if ( serNum == msgBase->getMsgSerNum() ) {
        item->setAboutToBeDeleted ( false );
        item->setSelectable ( true );
      }
    }
  }
  triggerUpdate();
}

//-----------------------------------------------------------------------------
KMMessageList* KMHeaders::selectedMsgs(bool toBeDeleted)
{
  mSelMsgBaseList.clear();
  for (TQListViewItemIterator it(this); it.current(); it++) {
    if ( it.current()->isSelected() && it.current()->isVisible() ) {
      HeaderItem *item = static_cast<HeaderItem*>(it.current());
      if ( !item->aboutToBeDeleted() ) { // we are already working on this one
        if (toBeDeleted) {
          // make sure the item is not uselessly rethreaded and not selectable
          item->setAboutToBeDeleted ( true );
          item->setSelectable ( false );
        }
        KMMsgBase *msgBase = mFolder->getMsgBase(item->msgId());
        mSelMsgBaseList.append(msgBase);
      }
    }
  }
  return &mSelMsgBaseList;
}

//-----------------------------------------------------------------------------
TQValueList<int> KMHeaders::selectedItems()
{
  TQValueList<int> items;
  for ( TQListViewItemIterator it(this); it.current(); it++ )
  {
    if ( it.current()->isSelected() && it.current()->isVisible() )
    {
      HeaderItem* item = static_cast<HeaderItem*>( it.current() );
      items.append( item->msgId() );
    }
  }
  return items;
}

//-----------------------------------------------------------------------------
int KMHeaders::firstSelectedMsg() const
{
  int selectedMsg = -1;
  TQListViewItem *item;
  for (item = firstChild(); item; item = item->itemBelow())
    if (item->isSelected()) {
      selectedMsg = (static_cast<HeaderItem*>(item))->msgId();
      break;
    }
  return selectedMsg;
}

//-----------------------------------------------------------------------------
void KMHeaders::nextMessage()
{
  TQListViewItem *lvi = currentItem();
  if (lvi && lvi->itemBelow()) {
    clearSelection();
    setSelected( lvi, false );
    selectNextMessage();
    setSelectionAnchor( currentItem() );
    ensureCurrentItemVisible();
  }
}

void KMHeaders::selectNextMessage()
{
  KMMessage *cm = currentMsg();
  if ( cm && cm->isBeingParsed() )
    return;
  TQListViewItem *lvi = currentItem();
  if( lvi ) {
    TQListViewItem *below = lvi->itemBelow();
    TQListViewItem *temp = lvi;
    if (lvi && below ) {
      while (temp) {
        temp->firstChild();
        temp = temp->parent();
      }
      lvi->repaint();
      /* test to see if we need to unselect messages on back track */
      (below->isSelected() ? setSelected(lvi, false) : setSelected(below, true));
      setCurrentItem(below);
      makeHeaderVisible();
      setFolderInfoStatus();
    }
  }
}

//-----------------------------------------------------------------------------
void KMHeaders::prevMessage()
{
  TQListViewItem *lvi = currentItem();
  if (lvi && lvi->itemAbove()) {
    clearSelection();
    setSelected( lvi, false );
    selectPrevMessage();
    setSelectionAnchor( currentItem() );
    ensureCurrentItemVisible();
  }
}

void KMHeaders::selectPrevMessage()
{
  KMMessage *cm = currentMsg();
  if ( cm && cm->isBeingParsed() )
    return;
  TQListViewItem *lvi = currentItem();
  if( lvi ) {
    TQListViewItem *above = lvi->itemAbove();
    TQListViewItem *temp = lvi;

    if (lvi && above) {
      while (temp) {
        temp->firstChild();
        temp = temp->parent();
      }
      lvi->repaint();
      /* test to see if we need to unselect messages on back track */
      (above->isSelected() ? setSelected(lvi, false) : setSelected(above, true));
      setCurrentItem(above);
      makeHeaderVisible();
      setFolderInfoStatus();
    }
  }
}


void KMHeaders::incCurrentMessage()
{
  KMMessage *cm = currentMsg();
  if ( cm && cm->isBeingParsed() )
    return;
  TQListViewItem *lvi = currentItem();
  if ( lvi && lvi->itemBelow() ) {

    disconnect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
               this,TQT_SLOT(highlightMessage(TQListViewItem*)));
    setCurrentItem( lvi->itemBelow() );
    ensureCurrentItemVisible();
    setFocus();
    connect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
               this,TQT_SLOT(highlightMessage(TQListViewItem*)));
  }
}

void KMHeaders::decCurrentMessage()
{
  KMMessage *cm = currentMsg();
  if ( cm && cm->isBeingParsed() )
    return;
  TQListViewItem *lvi = currentItem();
  if ( lvi && lvi->itemAbove() ) {
    disconnect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
               this,TQT_SLOT(highlightMessage(TQListViewItem*)));
    setCurrentItem( lvi->itemAbove() );
    ensureCurrentItemVisible();
    setFocus();
    connect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
            this,TQT_SLOT(highlightMessage(TQListViewItem*)));
  }
}

void KMHeaders::selectCurrentMessage()
{
  setCurrentMsg( currentItemIndex() );
  highlightMessage( currentItem() );
}

//-----------------------------------------------------------------------------
void KMHeaders::findUnreadAux( HeaderItem*& item,
                                        bool & foundUnreadMessage,
                                        bool onlyNew,
                                        bool aDirNext )
{
  KMMsgBase* msgBase = 0;
  HeaderItem *lastUnread = 0;
  /* itemAbove() is _slow_ */
  if (aDirNext)
  {
    while (item) {
      msgBase = mFolder->getMsgBase(item->msgId());
      if (!msgBase) continue;
      if (msgBase->isUnread() || msgBase->isNew())
        foundUnreadMessage = true;

      if (!onlyNew && (msgBase->isUnread() || msgBase->isNew())) break;
      if (onlyNew && msgBase->isNew()) break;
      item = static_cast<HeaderItem*>(item->itemBelow());
    }
  } else {
    HeaderItem *newItem = static_cast<HeaderItem*>(firstChild());
    while (newItem)
    {
      msgBase = mFolder->getMsgBase(newItem->msgId());
      if (!msgBase) continue;
      if (msgBase->isUnread() || msgBase->isNew())
        foundUnreadMessage = true;
      if ( ( !onlyNew && (msgBase->isUnread() || msgBase->isNew()) )
          || ( onlyNew && msgBase->isNew() ) )
        lastUnread = newItem;
      if (newItem == item) break;
      newItem = static_cast<HeaderItem*>(newItem->itemBelow());
    }
    item = lastUnread;
  }
}

//-----------------------------------------------------------------------------
int KMHeaders::findUnread(bool aDirNext, int aStartAt, bool onlyNew, bool acceptCurrent)
{
  HeaderItem *item, *pitem;
  bool foundUnreadMessage = false;

  if (!mFolder) return -1;
  if (mFolder->count() <= 0) return -1;

  if ((aStartAt >= 0) && (aStartAt < (int)mItems.size()))
    item = mItems[aStartAt];
  else {
    item = currentHeaderItem();
    if (!item) {
      if (aDirNext)
        item = static_cast<HeaderItem*>(firstChild());
      else
        item = static_cast<HeaderItem*>(lastChild());
    }
    if (!item)
      return -1;

    if ( !acceptCurrent ) {
        if (aDirNext) {
            item = static_cast<HeaderItem*>(item->itemBelow());
        }
        else {
            item = static_cast<HeaderItem*>(item->itemAbove());
        }
    }
  }

  pitem =  item;

  findUnreadAux( item, foundUnreadMessage, onlyNew, aDirNext );

  // We have found an unread item, but it is not necessary the
  // first unread item.
  //
  // Find the ancestor of the unread item closest to the
  // root and recursively sort all of that ancestors children.
  if (item) {
    TQListViewItem *next = item;
    while (next->parent())
      next = next->parent();
    next = static_cast<HeaderItem*>(next)->firstChildNonConst();
    while (next && (next != item))
      if (static_cast<HeaderItem*>(next)->firstChildNonConst())
        next = next->firstChild();
      else if (next->nextSibling())
        next = next->nextSibling();
      else {
        while (next && (next != item)) {
          next = next->parent();
          if (next == item)
            break;
          if (next && next->nextSibling()) {
            next = next->nextSibling();
            break;
          }
        }
      }
  }

  item = pitem;

  findUnreadAux( item, foundUnreadMessage, onlyNew, aDirNext );
  if (item)
    return item->msgId();


  // A kludge to try to keep the number of unread messages in sync
  int unread = mFolder->countUnread();
  if (((unread == 0) && foundUnreadMessage) ||
      ((unread > 0) && !foundUnreadMessage)) {
    mFolder->correctUnreadMsgsCount();
  }
  return -1;
}

//-----------------------------------------------------------------------------
bool KMHeaders::nextUnreadMessage(bool acceptCurrent)
{
  if ( !mFolder || !mFolder->countUnread() ) return false;
  int i = findUnread(true, -1, false, acceptCurrent);
  if ( i < 0 && GlobalSettings::self()->loopOnGotoUnread() !=
        GlobalSettings::EnumLoopOnGotoUnread::DontLoop )
  {
    HeaderItem * first = static_cast<HeaderItem*>(firstChild());
    if ( first )
      i = findUnread(true, first->msgId(), false, acceptCurrent); // from top
  }
  if ( i < 0 )
    return false;
  setCurrentMsg(i);
  ensureCurrentItemVisible();
  return true;
}

void KMHeaders::ensureCurrentItemVisible()
{
    int i = currentItemIndex();
    if ((i >= 0) && (i < (int)mItems.size()))
        center( contentsX(), itemPos(mItems[i]), 0, 9.0 );
}

//-----------------------------------------------------------------------------
bool KMHeaders::prevUnreadMessage()
{
  if ( !mFolder || !mFolder->countUnread() ) return false;
  int i = findUnread(false);
  if ( i < 0 && GlobalSettings::self()->loopOnGotoUnread() !=
        GlobalSettings::EnumLoopOnGotoUnread::DontLoop )
  {
    HeaderItem * last = static_cast<HeaderItem*>(lastItem());
    if ( last )
      i = findUnread(false, last->msgId() ); // from bottom
  }
  if ( i < 0 )
    return false;
  setCurrentMsg(i);
  ensureCurrentItemVisible();
  return true;
}


//-----------------------------------------------------------------------------
void KMHeaders::slotNoDrag()
{
  // This causes Kolab issue 1569 (encrypted mails sometimes not dragable)
  // This was introduced in r73594 to fix interference between dnd and
  // pinentry, which is no longer reproducable now. However, since the
  // original problem was probably a race and might reappear, let's keep
  // this workaround in for now and just disable it.
//   mMousePressed = false;
}


//-----------------------------------------------------------------------------
void KMHeaders::makeHeaderVisible()
{
  if (currentItem())
    ensureItemVisible( currentItem() );
}

//-----------------------------------------------------------------------------
void KMHeaders::highlightMessage(TQListViewItem* lvi, bool markitread)
{
  // shouldnt happen but will crash if it does
  if (lvi && !lvi->isSelectable()) return;

  HeaderItem *item = static_cast<HeaderItem*>(lvi);
  if (lvi != mPrevCurrent) {
    if (mPrevCurrent && mFolder)
    {
      KMMessage *prevMsg = mFolder->getMsg(mPrevCurrent->msgId());
      if (prevMsg && mReaderWindowActive)
      {
        mFolder->ignoreJobsForMessage(prevMsg);
        if (!prevMsg->transferInProgress())
          mFolder->unGetMsg(mPrevCurrent->msgId());
      }
    }
    mPrevCurrent = item;
  }

  if (!item) {
    emit selected( 0 ); return;
  }

  int idx = item->msgId();
  KMMessage *msg = mFolder->getMsg(idx);
  if (mReaderWindowActive && !msg) {
    emit selected( 0 );
    mPrevCurrent = 0;
    return;
  }

  BroadcastStatus::instance()->setStatusMsg("");
  if (markitread && idx >= 0) setMsgRead(idx);
  mItems[idx]->irefresh();
  mItems[idx]->repaint();
  emit selected( msg );
  setFolderInfoStatus();
}

void KMHeaders::highlightCurrentThread()
{
  TQPtrList<TQListViewItem> curThread = currentThread();
  TQPtrListIterator<TQListViewItem> it( curThread );

  for ( it.toFirst() ; it.current() ; ++it ) {
      TQListViewItem *lvi = *it;
      lvi->setSelected( true );
      lvi->repaint();
  }
}

void KMHeaders::resetCurrentTime()
{
    mDate.reset();
    // only reset exactly during minute switch
    TQTimer::singleShot( ( 60-TQTime::currentTime().second() ) * 1000,
        this, TQT_SLOT( resetCurrentTime() ) );
}

//-----------------------------------------------------------------------------
void KMHeaders::selectMessage(TQListViewItem* lvi)
{
  HeaderItem *item = static_cast<HeaderItem*>(lvi);
  if (!item)
    return;

  int idx = item->msgId();
  KMMessage *msg = mFolder->getMsg(idx);
  if (msg && !msg->transferInProgress())
  {
    emit activated(mFolder->getMsg(idx));
  }

//  if (kmkernel->folderIsDraftOrOutbox(mFolder))
//    setOpen(lvi, !lvi->isOpen());
}


//-----------------------------------------------------------------------------
void KMHeaders::updateMessageList( bool set_selection, bool forceJumpToUnread )
{
  mPrevCurrent = 0;
  noRepaint = true;
  clear();
  mItems.resize(0); // will contain deleted pointers
  noRepaint = false;
  KListView::setSorting( mSortCol, !mSortDescending );
  if (!mFolder) {
    repaint();
    return;
  }
  readSortOrder( set_selection, forceJumpToUnread );
  emit messageListUpdated();
}


//-----------------------------------------------------------------------------
// KMail Header list selection/navigation description
//
// If the selection state changes the reader window is updated to show the
// current item.
//
// (The selection state of a message or messages can be changed by pressing
//  space, or normal/shift/cntrl clicking).
//
// The following keyboard events are supported when the messages headers list
// has focus, Ctrl+Key_Down, Ctrl+Key_Up, Ctrl+Key_Home, Ctrl+Key_End,
// Ctrl+Key_Next, Ctrl+Key_Prior, these events change the current item but do
// not change the selection state.
//
// Exception: When shift selecting either with mouse or key press the reader
// window is updated regardless of whether of not the selection has changed.
void KMHeaders::keyPressEvent( TQKeyEvent * e )
{
    bool cntrl = (e->state() & ControlButton );
    bool shft = (e->state() & ShiftButton );
    TQListViewItem *cur = currentItem();

    if (!e || !firstChild())
      return;

    // If no current item, make some first item current when a key is pressed
    if (!cur) {
      setCurrentItem( firstChild() );
      setSelectionAnchor( currentItem() );
      return;
    }

    // Handle space key press
    if (cur->isSelectable() && e->ascii() == ' ' ) {
        setSelected( cur, !cur->isSelected() );
        highlightMessage( cur, false);
        return;
    }

    if (cntrl) {
      if (!shft)
        disconnect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
                   this,TQT_SLOT(highlightMessage(TQListViewItem*)));
      switch (e->key()) {
      case Key_Down:
      case Key_Up:
      case Key_Home:
      case Key_End:
      case Key_Next:
      case Key_Prior:
      case Key_Escape:
        KListView::keyPressEvent( e );
      }
      if (!shft)
        connect(this,TQT_SIGNAL(currentChanged(TQListViewItem*)),
                this,TQT_SLOT(highlightMessage(TQListViewItem*)));
    }
}

//-----------------------------------------------------------------------------
// Handle RMB press, show pop up menu
void KMHeaders::rightButtonPressed( TQListViewItem *lvi, const TQPoint &, int )
{
  if (!lvi)
    return;

  if (!(lvi->isSelected())) {
    clearSelection();
  }
  setSelected( lvi, true );
  slotRMB();
}

//-----------------------------------------------------------------------------
void KMHeaders::contentsMousePressEvent(TQMouseEvent* e)
{
  mPressPos = e->pos();
  TQListViewItem *lvi = itemAt( contentsToViewport( e->pos() ));
  bool wasSelected = false;
  bool rootDecoClicked = false;
  if (lvi) {
     wasSelected = lvi->isSelected();
     rootDecoClicked =
        (  mPressPos.x() <= header()->cellPos(  header()->mapToActual(  0 ) ) +
           treeStepSize() * (  lvi->depth() + (  rootIsDecorated() ? 1 : 0 ) ) + itemMargin() )
        && (  mPressPos.x() >= header()->cellPos(  header()->mapToActual(  0 ) ) );

     if ( rootDecoClicked ) {
        // Check if our item is the parent of a closed thread and if so, if the root
        // decoration of the item was clicked (i.e. the +/- sign) which would expand
        // the thread. In that case, deselect all children, so opening the thread
        // doesn't cause a flicker.
        if ( !lvi->isOpen() && lvi->firstChild() ) {
           TQListViewItem *nextRoot = lvi->itemBelow();
           TQListViewItemIterator it( lvi->firstChild() );
           for( ; (*it) != nextRoot; ++it )
              (*it)->setSelected( false );
        }
     }
  }

  // let klistview do it's thing, expanding/collapsing, selection/deselection
  KListView::contentsMousePressEvent(e);
  /* TQListView's shift-select selects also invisible items. Until that is
     fixed, we have to deselect hidden items here manually, so the quick
     search doesn't mess things up. */
  if ( e->state() & ShiftButton ) {
    TQListViewItemIterator it( this, TQListViewItemIterator::Invisible );
    while ( it.current() ) {
      it.current()->setSelected( false );
      ++it;
    }
  }

  if ( rootDecoClicked ) {
      // select the thread's children after closing if the parent is selected
     if ( lvi && !lvi->isOpen() && lvi->isSelected() )
        setSelected( lvi, true );
  }

  if ( lvi && !rootDecoClicked ) {
    if ( lvi != currentItem() )
      highlightMessage( lvi );
    /* Explicitely set selection state. This is necessary because we want to
     * also select all children of closed threads when the parent is selected. */

    // unless ctrl mask, set selected if it isn't already
    if ( !( e->state() & ControlButton ) && !wasSelected )
      setSelected( lvi, true );
    // if ctrl mask, toggle selection
    if ( e->state() & ControlButton )
      setSelected( lvi, !wasSelected );

    if ((e->button() == Qt::LeftButton) )
      mMousePressed = true;
  }

  // check if we are on a status column and toggle it
  if ( lvi && e->button() == Qt::LeftButton  && !( e->state() & (ShiftButton | ControlButton | AltButton | MetaButton) ) ) {
    bool flagsToggleable = GlobalSettings::self()->allowLocalFlags() || !(mFolder ? mFolder->isReadOnly() : true);
    int section = header()->sectionAt( e->pos().x() );
    HeaderItem *item = static_cast<HeaderItem*>( lvi );
    KMMsgBase *msg = mFolder->getMsgBase(item->msgId());
    if ( section == mPaintInfo.flagCol && flagsToggleable ) {
      setMsgStatus( KMMsgStatusFlag, true );
    } else if ( section == mPaintInfo.importantCol && flagsToggleable ) {
      setMsgStatus( KMMsgStatusFlag, true );
    } else if ( section == mPaintInfo.todoCol && flagsToggleable ) {
      setMsgStatus( KMMsgStatusTodo, true );
    } else if ( section == mPaintInfo.watchedIgnoredCol && flagsToggleable ) {
      if ( msg->isWatched() || msg->isIgnored() )
        setMsgStatus( KMMsgStatusIgnored, true );
      else
        setMsgStatus( KMMsgStatusWatched, true );
    } else if ( section == mPaintInfo.statusCol ) {
      if ( msg->isUnread() || msg->isNew() )
        setMsgStatus( KMMsgStatusRead );
      else
        setMsgStatus( KMMsgStatusUnread );
    }
  }
}

//-----------------------------------------------------------------------------
void KMHeaders::contentsMouseReleaseEvent(TQMouseEvent* e)
{
  if (e->button() != Qt::RightButton)
    KListView::contentsMouseReleaseEvent(e);

  mMousePressed = false;
}

//-----------------------------------------------------------------------------
void KMHeaders::contentsMouseMoveEvent( TQMouseEvent* e )
{
  if (mMousePressed &&
      (e->pos() - mPressPos).manhattanLength() > TDEGlobalSettings::dndEventDelay()) {
    mMousePressed = false;
    TQListViewItem *item = itemAt( contentsToViewport(mPressPos) );
    if ( item ) {
      MailList mailList;
      unsigned int count = 0;
      for( TQListViewItemIterator it(this); it.current(); it++ )
        if( it.current()->isSelected() ) {
          HeaderItem *item = static_cast<HeaderItem*>(it.current());
          KMMsgBase *msg = mFolder->getMsgBase(item->msgId());
          // FIXME: msg can be null here which crashes.  I think it's a race
          //        because it's very hard to reproduce. (GS)
          MailSummary mailSummary( msg->getMsgSerNum(), msg->msgIdMD5(),
                                   msg->subject(), msg->fromStrip(),
                                   msg->toStrip(), msg->date() );
          mailList.append( mailSummary );
          ++count;
        }
      MailListDrag *d = new MailListDrag( mailList, viewport(), new KMTextSource );

      // Set pixmap
      TQPixmap pixmap;
      if( count == 1 )
        pixmap = TQPixmap( DesktopIcon("message", KIcon::SizeSmall) );
      else
        pixmap = TQPixmap( DesktopIcon("kmultiple", KIcon::SizeSmall) );

      // Calculate hotspot (as in Konqueror)
      if( !pixmap.isNull() ) {
        TQPoint hotspot( pixmap.width() / 2, pixmap.height() / 2 );
        d->setPixmap( pixmap, hotspot );
      }
      if ( mFolder->isReadOnly() )
        d->dragCopy();
      else
        d->drag();
    }
  }
}

void KMHeaders::highlightMessage(TQListViewItem* i)
{
    highlightMessage( i, false );
}

//-----------------------------------------------------------------------------
void KMHeaders::slotRMB()
{
  if (!topLevelWidget()) return; // safe bet
  mOwner->updateMessageActions();

  // check if the user clicked into a status column and only show the respective menues
  TQListViewItem *item = itemAt( viewport()->mapFromGlobal( TQCursor::pos() ) );
  if ( item ) {
    int section = header()->sectionAt( viewportToContents( viewport()->mapFromGlobal( TQCursor::pos() ) ).x() );
    if ( section == mPaintInfo.flagCol || section == mPaintInfo.importantCol
         || section == mPaintInfo.todoCol || section == mPaintInfo.statusCol ) {
      mOwner->statusMenu()->popup( TQCursor::pos() );
      return;
    }
    if ( section == mPaintInfo.watchedIgnoredCol ) {
      mOwner->threadStatusMenu()->popup( TQCursor::pos() );
      return;
    }
  }

  TQPopupMenu *menu = new TQPopupMenu(this);

  mMenuToFolder.clear();

  mOwner->updateMessageMenu();

  bool out_folder = kmkernel->folderIsDraftOrOutbox( mFolder );
  bool tem_folder = kmkernel->folderIsTemplates( mFolder );
  if ( tem_folder ) {
     mOwner->useAction()->plug( menu );
  } else {
    // show most used actions
    mOwner->messageActions()->replyMenu()->plug( menu );
    mOwner->forwardMenu()->plug( menu );
    if( mOwner->sendAgainAction()->isEnabled() ) {
      mOwner->sendAgainAction()->plug( menu );
    } else {
      mOwner->editAction()->plug( menu );
    }
  }
  menu->insertSeparator();

  TQPopupMenu *msgCopyMenu = new TQPopupMenu(menu);
  mOwner->folderTree()->folderToPopupMenu( KMFolderTree::CopyMessage, TQT_TQOBJECT(this),
      &mMenuToFolder, msgCopyMenu );
  menu->insertItem(i18n("&Copy To"), msgCopyMenu);

  if ( !mFolder->canDeleteMessages() ) {
    int id = menu->insertItem( i18n("&Move To") );
    menu->setItemEnabled( id, false );
  } else {
    TQPopupMenu *msgMoveMenu = new TQPopupMenu(menu);
    mOwner->folderTree()->folderToPopupMenu( KMFolderTree::MoveMessage, TQT_TQOBJECT(this),
        &mMenuToFolder, msgMoveMenu );
    menu->insertItem(i18n("&Move To"), msgMoveMenu);
  }
  menu->insertSeparator();
  mOwner->statusMenu()->plug( menu ); // Mark Message menu
  if ( mOwner->threadStatusMenu()->isEnabled() ) {
    mOwner->threadStatusMenu()->plug( menu ); // Mark Thread menu
  }

  if ( !out_folder && !tem_folder ) {
    menu->insertSeparator();
    mOwner->filterMenu()->plug( menu ); // Create Filter menu
    mOwner->action( "apply_filter_actions" )->plug( menu );
  }

  menu->insertSeparator();
  mOwner->printAction()->plug(menu);
  mOwner->saveAsAction()->plug(menu);
  mOwner->saveAttachmentsAction()->plug(menu);
  menu->insertSeparator();
  if ( mFolder->isTrash() ) {
    mOwner->deleteAction()->plug(menu);
    if ( mOwner->trashThreadAction()->isEnabled() )
      mOwner->deleteThreadAction()->plug(menu);
  } else {
    mOwner->trashAction()->plug(menu);
    if ( mOwner->trashThreadAction()->isEnabled() )
      mOwner->trashThreadAction()->plug(menu);
  }
  menu->insertSeparator();
  mOwner->messageActions()->createTodoAction()->plug( menu );

  KAcceleratorManager::manage(menu);
  kmkernel->setContextMenuShown( true );
  menu->exec(TQCursor::pos(), 0);
  kmkernel->setContextMenuShown( false );
  delete menu;
}

//-----------------------------------------------------------------------------
KMMessage* KMHeaders::currentMsg()
{
  HeaderItem *hi = currentHeaderItem();
  if (!hi)
    return 0;
  else
    return mFolder->getMsg(hi->msgId());
}

//-----------------------------------------------------------------------------
HeaderItem* KMHeaders::currentHeaderItem()
{
  return static_cast<HeaderItem*>(currentItem());
}

//-----------------------------------------------------------------------------
int KMHeaders::currentItemIndex()
{
  HeaderItem* item = currentHeaderItem();
  if (item)
    return item->msgId();
  else
    return -1;
}

//-----------------------------------------------------------------------------
void KMHeaders::setCurrentItemByIndex(int msgIdx)
{
  if (!mFolder->isOpened()) setFolder(mFolder);

  if ((msgIdx >= 0) && (msgIdx < (int)mItems.size())) {
    clearSelection();
    bool unchanged = (currentItem() == mItems[msgIdx]);
    setCurrentItem( mItems[msgIdx] );
    setSelected( mItems[msgIdx], true );
    setSelectionAnchor( currentItem() );
    if (unchanged)
       highlightMessage( mItems[msgIdx], false);
    makeHeaderVisible();
  }
}

//-----------------------------------------------------------------------------
int KMHeaders::topItemIndex()
{
  HeaderItem *item = static_cast<HeaderItem*>( itemAt( TQPoint( 1, 1 ) ) );
  if ( item )
    return item->msgId();
  else
    return -1;
}

//-----------------------------------------------------------------------------
void KMHeaders::setTopItemByIndex( int aMsgIdx)
{
  if ( aMsgIdx < 0 || static_cast<unsigned int>( aMsgIdx ) >= mItems.size() )
    return;
  const TQListViewItem * const item = mItems[aMsgIdx];
  if ( item )
    setContentsPos( 0, itemPos( item ) );
}

//-----------------------------------------------------------------------------
void KMHeaders::setNestedOverride( bool override )
{
  mSortInfo.dirty = true;
  mNestedOverride = override;
  setRootIsDecorated( nestingPolicy != AlwaysOpen
                      && isThreaded() );
  TQString sortFile = mFolder->indexLocation() + ".sorted";
  unlink(TQFile::encodeName(sortFile));
  reset();
}

//-----------------------------------------------------------------------------
void KMHeaders::setSubjectThreading( bool aSubjThreading )
{
  mSortInfo.dirty = true;
  mSubjThreading = aSubjThreading;
  TQString sortFile = mFolder->indexLocation() + ".sorted";
  unlink(TQFile::encodeName(sortFile));
  reset();
}

//-----------------------------------------------------------------------------
void KMHeaders::setOpen( TQListViewItem *item, bool open )
{
  if ((nestingPolicy != AlwaysOpen)|| open)
      ((HeaderItem*)item)->setOpenRecursive( open );
}

//-----------------------------------------------------------------------------
const KMMsgBase* KMHeaders::getMsgBaseForItem( const TQListViewItem *item ) const
{
  const HeaderItem *hi = static_cast<const HeaderItem *> ( item );
  return mFolder->getMsgBase( hi->msgId() );
}

//-----------------------------------------------------------------------------
void KMHeaders::setSorting( int column, bool ascending )
{
  if ( mIgnoreSortOrderChanges )
    return;

  if (column != -1) {
  // carsten: really needed?
//    if (column != mSortCol)
//      setColumnText( mSortCol, TQIconSet( TQPixmap()), columnText( mSortCol ));
    if(mSortInfo.dirty || column != mSortInfo.column || ascending != mSortInfo.ascending) { //dirtied
        TQObject::disconnect(header(), TQT_SIGNAL(clicked(int)), this, TQT_SLOT(dirtySortOrder(int)));
        mSortInfo.dirty = true;
    }

    assert(column >= 0);
    mSortCol = column;
    mSortDescending = !ascending;

    if (!ascending && (column == mPaintInfo.dateCol))
      mPaintInfo.orderOfArrival = !mPaintInfo.orderOfArrival;

    if (!ascending && (column == mPaintInfo.subCol))
      mPaintInfo.status = !mPaintInfo.status;

    TQString colText = i18n( "Date" );
    if (mPaintInfo.orderOfArrival)
      colText = i18n( "Order of Arrival" );
    setColumnText( mPaintInfo.dateCol, colText);

    colText = i18n( "Subject" );
    if (mPaintInfo.status)
      colText = colText + i18n( " (Status)" );
    setColumnText( mPaintInfo.subCol, colText);
  }
  KListView::setSorting( column, ascending );
  ensureCurrentItemVisible();
  // Make sure the config and .sorted file are updated, otherwise stale info
  // is read on new imap mail. ( folder->folderComplete() -> readSortOrder() ).
  if ( mFolder ) {
    writeFolderConfig();
    writeSortOrder();
  }
}

//Flatten the list and write it to disk
static void internalWriteItem(FILE *sortStream, KMFolder *folder, int msgid,
                              int parent_id, TQString key,
                              bool update_discover=true)
{
  unsigned long msgSerNum;
  unsigned long parentSerNum;
  msgSerNum = KMMsgDict::instance()->getMsgSerNum( folder, msgid );
  if (parent_id >= 0)
    parentSerNum = KMMsgDict::instance()->getMsgSerNum( folder, parent_id ) + KMAIL_RESERVED;
  else
    parentSerNum = (unsigned long)(parent_id + KMAIL_RESERVED);

  fwrite(&msgSerNum, sizeof(msgSerNum), 1, sortStream);
  fwrite(&parentSerNum, sizeof(parentSerNum), 1, sortStream);
  TQ_INT32 len = key.length() * sizeof(TQChar);
  fwrite(&len, sizeof(len), 1, sortStream);
  if (len)
    fwrite(key.unicode(), TQMIN(len, KMAIL_MAX_KEY_LEN), 1, sortStream);

  if (update_discover) {
    //update the discovered change count
      TQ_INT32 discovered_count = 0;
      fseek(sortStream, KMAIL_MAGIC_HEADER_OFFSET + 20, SEEK_SET);
      fread(&discovered_count, sizeof(discovered_count), 1, sortStream);
      discovered_count++;
      fseek(sortStream, KMAIL_MAGIC_HEADER_OFFSET + 20, SEEK_SET);
      fwrite(&discovered_count, sizeof(discovered_count), 1, sortStream);
  }
}

void KMHeaders::folderCleared()
{
    mSortCacheItems.clear(); //autoDelete is true
    mSubjectLists.clear();
    mImperfectlyThreadedList.clear();
    mPrevCurrent = 0;
    emit selected(0);
}


void KMHeaders::folderClosed()
{
  if ( mFolder->open( "kmheaders" ) == 0 )
    updateMessageList();
  else
    folderCleared();
}

bool KMHeaders::writeSortOrder()
{
  TQString sortFile = KMAIL_SORT_FILE(mFolder);

  if (!mSortInfo.dirty) {
    struct stat stat_tmp;
    if(stat(TQFile::encodeName(sortFile), &stat_tmp) == -1) {
        mSortInfo.dirty = true;
    }
  }
  if (mSortInfo.dirty) {
    if (!mFolder->count()) {
      // Folder is empty now, remove the sort file.
      unlink(TQFile::encodeName(sortFile));
      return true;
    }
    TQString tempName = sortFile + ".temp";
    unlink(TQFile::encodeName(tempName));
    FILE *sortStream = fopen(TQFile::encodeName(tempName), "w");
    if (!sortStream)
      return false;

    mSortInfo.ascending = !mSortDescending;
    mSortInfo.dirty = false;
    mSortInfo.column = mSortCol;
    fprintf(sortStream, KMAIL_SORT_HEADER, KMAIL_SORT_VERSION);
    //magic header information
    TQ_INT32 byteOrder = 0x12345678;
    TQ_INT32 column = mSortCol;
    TQ_INT32 ascending= !mSortDescending;
    TQ_INT32 threaded = isThreaded();
    TQ_INT32 appended=0;
    TQ_INT32 discovered_count = 0;
    TQ_INT32 sorted_count=0;
    fwrite(&byteOrder, sizeof(byteOrder), 1, sortStream);
    fwrite(&column, sizeof(column), 1, sortStream);
    fwrite(&ascending, sizeof(ascending), 1, sortStream);
    fwrite(&threaded, sizeof(threaded), 1, sortStream);
    fwrite(&appended, sizeof(appended), 1, sortStream);
    fwrite(&discovered_count, sizeof(discovered_count), 1, sortStream);
    fwrite(&sorted_count, sizeof(sorted_count), 1, sortStream);

    TQPtrStack<HeaderItem> items;
    {
      TQPtrStack<TQListViewItem> s;
      for (TQListViewItem * i = firstChild(); i; ) {
        items.push((HeaderItem *)i);
        if ( i->firstChild() ) {
          s.push( i );
          i = i->firstChild();
        } else if( i->nextSibling()) {
          i = i->nextSibling();
        } else {
            for(i=0; !i && s.count(); i = s.pop()->nextSibling())
              ;
        }
      }
    }

    KMMsgBase *kmb;
    while(HeaderItem *i = items.pop()) {
      int parent_id = -1; //no parent, top level
      if (threaded) {
        kmb = mFolder->getMsgBase( i->msgId() );
        assert(kmb); // I have seen 0L come out of this, called from
                   // KMHeaders::setFolder(0xgoodpointer, false);
                   // I see this crash too. after rebuilding a broken index on a dimap folder. always
        TQString replymd5 = kmb->replyToIdMD5();
        TQString replyToAuxId = kmb->replyToAuxIdMD5();
        SortCacheItem *p = NULL;
        if(!replymd5.isEmpty())
          p = mSortCacheItems[replymd5];

        if (p)
          parent_id = p->id();
        // We now have either found a parent, or set it to -1, which means that
        // it will be reevaluated when a message is added, for example. If there
        // is no replyToId and no replyToAuxId and the message is not prefixed,
        // this message is top level, and will always be, so no need to
        // reevaluate it.
        if (replymd5.isEmpty()
            && replyToAuxId.isEmpty()
            && !kmb->subjectIsPrefixed() )
          parent_id = -2;
        // FIXME also mark messages with -1 as -2 a certain amount of time after
        // their arrival, since it becomes very unlikely that a new parent for
        // them will show up. (Ingo suggests a month.) -till
      }
      internalWriteItem(sortStream, mFolder, i->msgId(), parent_id,
                        i->key(mSortCol, !mSortDescending), false);
      //double check for magic headers
      sorted_count++;
    }

    //magic header twice, case they've changed
    fseek(sortStream, KMAIL_MAGIC_HEADER_OFFSET, SEEK_SET);
    fwrite(&byteOrder, sizeof(byteOrder), 1, sortStream);
    fwrite(&column, sizeof(column), 1, sortStream);
    fwrite(&ascending, sizeof(ascending), 1, sortStream);
    fwrite(&threaded, sizeof(threaded), 1, sortStream);
    fwrite(&appended, sizeof(appended), 1, sortStream);
    fwrite(&discovered_count, sizeof(discovered_count), 1, sortStream);
    fwrite(&sorted_count, sizeof(sorted_count), 1, sortStream);
    if (sortStream && ferror(sortStream)) {
        fclose(sortStream);
        unlink(TQFile::encodeName(sortFile));
        kdWarning(5006) << "Error: Failure modifying " << sortFile << " (No space left on device?)" << endl;
        kdWarning(5006) << __FILE__ << ":" << __LINE__ << endl;
        kmkernel->emergencyExit( i18n("Failure modifying %1\n(No space left on device?)").arg( sortFile ));
    }
    fclose(sortStream);
    ::rename(TQFile::encodeName(tempName), TQFile::encodeName(sortFile));
  }

  return true;
}

void KMHeaders::appendItemToSortFile(HeaderItem *khi)
{
  TQString sortFile = KMAIL_SORT_FILE(mFolder);
  if(FILE *sortStream = fopen(TQFile::encodeName(sortFile), "r+")) {
    int parent_id = -1; //no parent, top level

    if (isThreaded()) {
      SortCacheItem *sci = khi->sortCacheItem();
      KMMsgBase *kmb = mFolder->getMsgBase( khi->msgId() );
      if(sci->parent() && !sci->isImperfectlyThreaded())
        parent_id = sci->parent()->id();
      else if(kmb->replyToIdMD5().isEmpty()
           && kmb->replyToAuxIdMD5().isEmpty()
           && !kmb->subjectIsPrefixed())
        parent_id = -2;
    }

    internalWriteItem(sortStream, mFolder, khi->msgId(), parent_id,
                      khi->key(mSortCol, !mSortDescending), false);

    //update the appended flag FIXME obsolete?
    TQ_INT32 appended = 1;
    fseek(sortStream, KMAIL_MAGIC_HEADER_OFFSET + 16, SEEK_SET);
    fwrite(&appended, sizeof(appended), 1, sortStream);
    fseek(sortStream, KMAIL_MAGIC_HEADER_OFFSET + 16, SEEK_SET);

    if (sortStream && ferror(sortStream)) {
        fclose(sortStream);
        unlink(TQFile::encodeName(sortFile));
        kdWarning(5006) << "Error: Failure modifying " << sortFile << " (No space left on device?)" << endl;
        kdWarning(5006) << __FILE__ << ":" << __LINE__ << endl;
        kmkernel->emergencyExit( i18n("Failure modifying %1\n(No space left on device?)").arg( sortFile ));
    }
    fclose(sortStream);
  } else {
    mSortInfo.dirty = true;
  }
}

void KMHeaders::dirtySortOrder(int column)
{
    mSortInfo.dirty = true;
    TQObject::disconnect(header(), TQT_SIGNAL(clicked(int)), this, TQT_SLOT(dirtySortOrder(int)));
    setSorting(column, mSortInfo.column == column ? !mSortInfo.ascending : true);
}

// -----------------
void SortCacheItem::updateSortFile( FILE *sortStream, KMFolder *folder,
                                      bool waiting_for_parent, bool update_discover)
{
    if(mSortOffset == -1) {
        fseek(sortStream, 0, SEEK_END);
        mSortOffset = ftell(sortStream);
    } else {
        fseek(sortStream, mSortOffset, SEEK_SET);
    }

    int parent_id = -1;
    if(!waiting_for_parent) {
        if(mParent && !isImperfectlyThreaded())
            parent_id = mParent->id();
    }
    internalWriteItem(sortStream, folder, mId, parent_id, mKey, update_discover);
}

static bool compare_ascending = false;
static bool compare_toplevel = true;
static int compare_SortCacheItem(const void *s1, const void *s2)
{
    if ( !s1 || !s2 )
        return 0;
    SortCacheItem **b1 = (SortCacheItem **)s1;
    SortCacheItem **b2 = (SortCacheItem **)s2;
    int ret = (*b1)->key().compare((*b2)->key());
    if(compare_ascending || !compare_toplevel)
        ret = -ret;
    return ret;
}

// Debugging helpers
void KMHeaders::printSubjectThreadingTree()
{
    TQDictIterator< TQPtrList< SortCacheItem > > it ( mSubjectLists );
    kdDebug(5006) << "SubjectThreading tree: " << endl;
    for( ; it.current(); ++it ) {
      TQPtrList<SortCacheItem> list = *( it.current() );
      TQPtrListIterator<SortCacheItem> it2( list ) ;
      kdDebug(5006) << "Subject MD5: " << it.currentKey() << " list: " << endl;
      for( ; it2.current(); ++it2 ) {
        SortCacheItem *sci = it2.current();
        kdDebug(5006) << "     item:" << sci << " sci id: " << sci->id() << endl;
      }
    }
    kdDebug(5006) << endl;
}

void KMHeaders::printThreadingTree()
{
    kdDebug(5006) << "Threading tree: " << endl;
    TQDictIterator<SortCacheItem> it( mSortCacheItems );
    kdDebug(5006) << endl;
    for( ; it.current(); ++it ) {
      SortCacheItem *sci = it.current();
      kdDebug(5006) << "MsgId MD5: " << it.currentKey() << " message id: " << sci->id() << endl;
    }
    for (int i = 0; i < (int)mItems.size(); ++i) {
      HeaderItem *item = mItems[i];
      int parentCacheId = item->sortCacheItem()->parent()?item->sortCacheItem()->parent()->id():0;
      kdDebug( 5006 ) << "SortCacheItem: " << item->sortCacheItem()->id() << " parent: " << parentCacheId << endl;
      kdDebug( 5006 ) << "Item: " << item << " sortCache: " << item->sortCacheItem() << " parent: " << item->sortCacheItem()->parent() << endl;
    }
    kdDebug(5006) << endl;
}

// -------------------------------------

void KMHeaders::buildThreadingTree( TQMemArray<SortCacheItem *> sortCache )
{
    mSortCacheItems.clear();
    mSortCacheItems.resize( mFolder->count() * 2 );

    // build a dict of all message id's
    for(int x = 0; x < mFolder->count(); x++) {
        KMMsgBase *mi = mFolder->getMsgBase(x);
        TQString md5 = mi->msgIdMD5();
        if(!md5.isEmpty())
            mSortCacheItems.replace(md5, sortCache[x]);
    }
}


void KMHeaders::buildSubjectThreadingTree( TQMemArray<SortCacheItem *> sortCache )
{
    mSubjectLists.clear();  // autoDelete is true
    mSubjectLists.resize( mFolder->count() * 2 );

    for(int x = 0; x < mFolder->count(); x++) {
        // Only a lot items that are now toplevel
        if ( sortCache[x]->parent()
          && sortCache[x]->parent()->id() != -666 ) continue;
        KMMsgBase *mi = mFolder->getMsgBase(x);
        TQString subjMD5 = mi->strippedSubjectMD5();
        if (subjMD5.isEmpty()) {
            mFolder->getMsgBase(x)->initStrippedSubjectMD5();
            subjMD5 = mFolder->getMsgBase(x)->strippedSubjectMD5();
        }
        if( subjMD5.isEmpty() ) continue;

        /* For each subject, keep a list of items with that subject
         * (stripped of prefixes) sorted by date. */
        if (!mSubjectLists.find(subjMD5))
            mSubjectLists.insert(subjMD5, new TQPtrList<SortCacheItem>());
        /* Insertion sort by date. These lists are expected to be very small.
         * Also, since the messages are roughly ordered by date in the store,
         * they should mostly be prepended at the very start, so insertion is
         * cheap. */
        int p=0;
        for (TQPtrListIterator<SortCacheItem> it(*mSubjectLists[subjMD5]);
                it.current(); ++it) {
            KMMsgBase *mb = mFolder->getMsgBase((*it)->id());
            if ( mb->date() < mi->date())
                break;
            p++;
        }
        mSubjectLists[subjMD5]->insert( p, sortCache[x]);
        sortCache[x]->setSubjectThreadingList( mSubjectLists[subjMD5] );
    }
}


SortCacheItem* KMHeaders::findParent(SortCacheItem *item)
{
    SortCacheItem *parent = NULL;
    if (!item) return parent;
    KMMsgBase *msg =  mFolder->getMsgBase(item->id());
    TQString replyToIdMD5 = msg->replyToIdMD5();
    item->setImperfectlyThreaded(true);
    /* First, try if the message our Reply-To header points to
     * is available to thread below. */
    if(!replyToIdMD5.isEmpty()) {
        parent = mSortCacheItems[replyToIdMD5];
        if (parent)
            item->setImperfectlyThreaded(false);
    }
    if (!parent) {
        // If we dont have a replyToId, or if we have one and the
        // corresponding message is not in this folder, as happens
        // if you keep your outgoing messages in an OUTBOX, for
        // example, try the list of references, because the second
        // to last will likely be in this folder. replyToAuxIdMD5
        // contains the second to last one.
        TQString  ref = msg->replyToAuxIdMD5();
        if (!ref.isEmpty())
            parent = mSortCacheItems[ref];
    }
    return parent;
}

SortCacheItem* KMHeaders::findParentBySubject(SortCacheItem *item)
{
    SortCacheItem *parent = NULL;
    if (!item) return parent;

    KMMsgBase *msg =  mFolder->getMsgBase(item->id());

    // Let's try by subject, but only if the  subject is prefixed.
    // This is necessary to make for example cvs commit mailing lists
    // work as expected without having to turn threading off alltogether.
    if (!msg->subjectIsPrefixed())
        return parent;

    TQString replyToIdMD5 = msg->replyToIdMD5();
    TQString subjMD5 = msg->strippedSubjectMD5();
    if (!subjMD5.isEmpty() && mSubjectLists[subjMD5]) {
        /* Iterate over the list of potential parents with the same
         * subject, and take the closest one by date. */
        for (TQPtrListIterator<SortCacheItem> it2(*mSubjectLists[subjMD5]);
                it2.current(); ++it2) {
            KMMsgBase *mb = mFolder->getMsgBase((*it2)->id());
            if ( !mb ) return parent;
            // make sure it's not ourselves
            if ( item == (*it2) ) continue;
            int delta = msg->date() - mb->date();
            // delta == 0 is not allowed, to avoid circular threading
            // with duplicates.
            if (delta > 0 ) {
                // Don't use parents more than 6 weeks older than us.
                if (delta < 3628899)
                    parent = (*it2);
                break;
            }
        }
    }
    return parent;
}

bool KMHeaders::readSortOrder( bool set_selection, bool forceJumpToUnread )
{
    if (!mFolder->isOpened()) mFolder->open("kmheaders");

    //all cases
    TQ_INT32 column, ascending, threaded, discovered_count, sorted_count, appended;
    TQ_INT32 deleted_count = 0;
    bool unread_exists = false;
    bool jumpToUnread = (GlobalSettings::self()->actionEnterFolder() ==
                         GlobalSettings::EnumActionEnterFolder::SelectFirstUnreadNew) ||
                        forceJumpToUnread;
    HeaderItem *oldestItem = 0;
    HeaderItem *newestItem = 0;
    TQMemArray<SortCacheItem *> sortCache(mFolder->count());
    bool error = false;

    //threaded cases
    TQPtrList<SortCacheItem> unparented;
    mImperfectlyThreadedList.clear();

    //cleanup
    mItems.fill( 0, mFolder->count() );
    sortCache.fill( 0 );

    mRoot->clearChildren();

    TQString sortFile = KMAIL_SORT_FILE(mFolder);
    FILE *sortStream = fopen(TQFile::encodeName(sortFile), "r+");
    mSortInfo.fakeSort = 0;

    if(sortStream) {
        mSortInfo.fakeSort = 1;
        int version = 0;
        if (fscanf(sortStream, KMAIL_SORT_HEADER, &version) != 1)
          version = -1;
        if(version == KMAIL_SORT_VERSION) {
          TQ_INT32 byteOrder = 0;
          fread(&byteOrder, sizeof(byteOrder), 1, sortStream);
          if (byteOrder == 0x12345678)
          {
            fread(&column, sizeof(column), 1, sortStream);
            fread(&ascending, sizeof(ascending), 1, sortStream);
            fread(&threaded, sizeof(threaded), 1, sortStream);
            fread(&appended, sizeof(appended), 1, sortStream);
            fread(&discovered_count, sizeof(discovered_count), 1, sortStream);
            fread(&sorted_count, sizeof(sorted_count), 1, sortStream);

            //Hackyness to work around qlistview problems
            KListView::setSorting(-1);
            header()->setSortIndicator(column, ascending);
            TQObject::connect(header(), TQT_SIGNAL(clicked(int)), this, TQT_SLOT(dirtySortOrder(int)));
            //setup mSortInfo here now, as above may change it
            mSortInfo.dirty = false;
            mSortInfo.column = (short)column;
            mSortInfo.ascending = (compare_ascending = ascending);

            SortCacheItem *item;
            unsigned long serNum, parentSerNum;
            int id, len, parent, x;
            TQChar *tmp_qchar = 0;
            int tmp_qchar_len = 0;
            const int mFolderCount = mFolder->count();
            TQString key;

            CREATE_TIMER(parse);
            START_TIMER(parse);
            for(x = 0; !feof(sortStream) && !error; x++) {
                off_t offset = ftell(sortStream);
                KMFolder *folder;
                //parse
                if(!fread(&serNum, sizeof(serNum), 1, sortStream) || //short read means to end
                   !fread(&parentSerNum, sizeof(parentSerNum), 1, sortStream) ||
                   !fread(&len, sizeof(len), 1, sortStream)) {
                    break;
                }
                if ((len < 0) || (len > KMAIL_MAX_KEY_LEN)) {
                    kdDebug(5006) << "Whoa.2! len " << len << " " << __FILE__ << ":" << __LINE__ << endl;
                    error = true;
                    continue;
                }
                if(len) {
                    if(len > tmp_qchar_len) {
                        tmp_qchar = (TQChar *)realloc(tmp_qchar, len);
                        tmp_qchar_len = len;
                    }
                    if(!fread(tmp_qchar, len, 1, sortStream))
                        break;
                    key = TQString(tmp_qchar, len / 2);
                } else {
                    key = TQString(""); //yuck
                }

                KMMsgDict::instance()->getLocation(serNum, &folder, &id);
                if (folder != mFolder) {
                    ++deleted_count;
                    continue;
                }
                if (parentSerNum < KMAIL_RESERVED) {
                    parent = (int)parentSerNum - KMAIL_RESERVED;
                } else {
                    KMMsgDict::instance()->getLocation(parentSerNum - KMAIL_RESERVED, &folder, &parent);
                    if (folder != mFolder)
                        parent = -1;
                }
                if ((id < 0) || (id >= mFolderCount) ||
                    (parent < -2) || (parent >= mFolderCount)) { // sanity checking
                    kdDebug(5006) << "Whoa.1! " << __FILE__ << ":" << __LINE__ << endl;
                    error = true;
                    continue;
                }

                if ((item=sortCache[id])) {
                    if (item->id() != -1) {
                        kdDebug(5006) << "Whoa.3! " << __FILE__ << ":" << __LINE__ << endl;
                        error = true;
                        continue;
                    }
                    item->setKey(key);
                    item->setId(id);
                    item->setOffset(offset);
                } else {
                    item = sortCache[id] = new SortCacheItem(id, key, offset);
                }
                if (threaded && parent != -2) {
                    if(parent == -1) {
                        unparented.append(item);
                        mRoot->addUnsortedChild(item);
                    } else {
                        if( ! sortCache[parent] ) {
                            sortCache[parent] = new SortCacheItem;
                        }
                        sortCache[parent]->addUnsortedChild(item);
                    }
                } else {
                    if(x < sorted_count )
                        mRoot->addSortedChild(item);
                    else {
                        mRoot->addUnsortedChild(item);
                    }
                }
            }
            if (error || (x != sorted_count + discovered_count)) {// sanity check
                kdDebug(5006) << endl << "Whoa: x " << x << ", sorted_count " << sorted_count << ", discovered_count " << discovered_count << ", count " << mFolder->count() << endl << endl;
                fclose(sortStream);
                sortStream = 0;
            }

            if(tmp_qchar)
                free(tmp_qchar);
            END_TIMER(parse);
            SHOW_TIMER(parse);
          }
          else {
              fclose(sortStream);
              sortStream = 0;
          }
        } else {
            fclose(sortStream);
            sortStream = 0;
        }
    }

    if (!sortStream) {
        mSortInfo.dirty = true;
        mSortInfo.column = column = mSortCol;
        mSortInfo.ascending = ascending = !mSortDescending;
        threaded = (isThreaded());
        sorted_count = discovered_count = appended = 0;
        KListView::setSorting( mSortCol, !mSortDescending );
    }
    //fill in empty holes
    if((sorted_count + discovered_count - deleted_count) < mFolder->count()) {
        CREATE_TIMER(holes);
        START_TIMER(holes);
        KMMsgBase *msg = 0;
        for(int x = 0; x < mFolder->count(); x++) {
            if((!sortCache[x] || (sortCache[x]->id() < 0)) && (msg=mFolder->getMsgBase(x))) {
                int sortOrder = column;
                if (mPaintInfo.orderOfArrival)
                    sortOrder |= (1 << 6);
                if (mPaintInfo.status)
                    sortOrder |= (1 << 5);
                sortCache[x] = new SortCacheItem(
                    x, HeaderItem::generate_key( this, msg, &mPaintInfo, sortOrder ));
                if(threaded)
                    unparented.append(sortCache[x]);
                else
                    mRoot->addUnsortedChild(sortCache[x]);
                if(sortStream)
                    sortCache[x]->updateSortFile(sortStream, mFolder, true, true);
                discovered_count++;
                appended = 1;
            }
        }
        END_TIMER(holes);
        SHOW_TIMER(holes);
    }

    // Make sure we've placed everything in parent/child relationship. All
    // messages with a parent id of -1 in the sort file are reevaluated here.
    if (threaded) buildThreadingTree( sortCache );
    TQPtrList<SortCacheItem> toBeSubjThreaded;

    if (threaded && !unparented.isEmpty()) {
        CREATE_TIMER(reparent);
        START_TIMER(reparent);

        for(TQPtrListIterator<SortCacheItem> it(unparented); it.current(); ++it) {
            SortCacheItem *item = (*it);
            SortCacheItem *parent = findParent( item );
            // If we have a parent, make sure it's not ourselves
            if ( parent && (parent != (*it)) ) {
                parent->addUnsortedChild((*it));
                if(sortStream)
                    (*it)->updateSortFile(sortStream, mFolder);
            } else {
                // if we will attempt subject threading, add to the list,
                // otherwise to the root with them
                if (mSubjThreading)
                  toBeSubjThreaded.append((*it));
                else
                  mRoot->addUnsortedChild((*it));
            }
        }

        if (mSubjThreading) {
            buildSubjectThreadingTree( sortCache );
            for(TQPtrListIterator<SortCacheItem> it(toBeSubjThreaded); it.current(); ++it) {
                SortCacheItem *item = (*it);
                SortCacheItem *parent = findParentBySubject( item );

                if ( parent ) {
                    parent->addUnsortedChild((*it));
                    if(sortStream)
                      (*it)->updateSortFile(sortStream, mFolder);
                } else {
                    //oh well we tried, to the root with you!
                    mRoot->addUnsortedChild((*it));
                }
            }
        }
        END_TIMER(reparent);
        SHOW_TIMER(reparent);
    }
    //create headeritems
    CREATE_TIMER(header_creation);
    START_TIMER(header_creation);
    HeaderItem *khi;
    SortCacheItem *i, *new_kci;
    TQPtrQueue<SortCacheItem> s;
    s.enqueue(mRoot);
    compare_toplevel = true;
    do {
        i = s.dequeue();
        const TQPtrList<SortCacheItem> *sorted = i->sortedChildren();
        int unsorted_count, unsorted_off=0;
        SortCacheItem **unsorted = i->unsortedChildren(unsorted_count);
        if(unsorted)
            qsort(unsorted, unsorted_count, sizeof(SortCacheItem *), //sort
                  compare_SortCacheItem);

        /* The sorted list now contains all sorted children of this item, while
         * the (aptly named) unsorted array contains all as of yet unsorted
         * ones. It has just been qsorted, so it is in itself sorted. These two
         * sorted lists are now merged into one. */
        for(TQPtrListIterator<SortCacheItem> it(*sorted);
            (unsorted && unsorted_off < unsorted_count) || it.current(); ) {
            /* As long as we have something in the sorted list and there is
               nothing unsorted left, use the item from the sorted list. Also
               if we are sorting descendingly and the sorted item is supposed
               to be sorted before the unsorted one do so. In the ascending
               case we invert the logic for non top level items. */
            if( it.current() &&
               ( !unsorted || unsorted_off >= unsorted_count
                ||
                ( ( !ascending || (ascending && !compare_toplevel) )
                  && (*it)->key() < unsorted[unsorted_off]->key() )
                ||
                (  ascending && (*it)->key() >= unsorted[unsorted_off]->key() )
                )
               )
            {
                new_kci = (*it);
                ++it;
            } else {
                /* Otherwise use the next item of the unsorted list */
                new_kci = unsorted[unsorted_off++];
            }
            if(new_kci->item() || new_kci->parent() != i) //could happen if you reparent
                continue;

            if(threaded && i->item()) {
                // If the parent is watched or ignored, propagate that to it's
                // children
                if (mFolder->getMsgBase(i->id())->isWatched())
                  mFolder->getMsgBase(new_kci->id())->setStatus(KMMsgStatusWatched);
                if (mFolder->getMsgBase(i->id())->isIgnored())
                  mFolder->getMsgBase(new_kci->id())->setStatus(KMMsgStatusIgnored);
                khi = new HeaderItem(i->item(), new_kci->id(), new_kci->key());
            } else {
                khi = new HeaderItem(this, new_kci->id(), new_kci->key());
            }
            new_kci->setItem(mItems[new_kci->id()] = khi);
            if(new_kci->hasChildren())
                s.enqueue(new_kci);
            // we always jump to new messages, but we only jump to
            // unread messages if we are told to do so
            if ( ( mFolder->getMsgBase(new_kci->id())->isNew() &&
                   GlobalSettings::self()->actionEnterFolder() ==
                   GlobalSettings::EnumActionEnterFolder::SelectFirstNew ) ||
                 ( ( mFolder->getMsgBase(new_kci->id())->isNew() ||
                     mFolder->getMsgBase(new_kci->id())->isUnread() ) &&
                   jumpToUnread ) )
            {
              unread_exists = true;
            }

            if ( !oldestItem || mFolder->getMsgBase( oldestItem->msgId() )->date() >
                  mFolder->getMsgBase( new_kci->id() )->date() ) {
              oldestItem = khi;
            }

            if ( !newestItem || mFolder->getMsgBase( newestItem->msgId() )->date() <
                  mFolder->getMsgBase( new_kci->id() )->date() ) {
              newestItem = khi;
            }
        }
        // If we are sorting by date and ascending the top level items are sorted
        // ascending and the threads themselves are sorted descending. One wants
        // to have new threads on top but the threads themselves top down.
        if (mSortCol == paintInfo()->dateCol)
          compare_toplevel = false;
    } while(!s.isEmpty());

    for(int x = 0; x < mFolder->count(); x++) {     //cleanup
        if (!sortCache[x]) { // not yet there?
            continue;
        }

        if (!sortCache[x]->item()) { // we missed a message, how did that happen ?
            kdDebug(5006) << "KMHeaders::readSortOrder - msg could not be threaded. "
                  << endl << "Please talk to your threading counselor asap. " <<  endl;
            khi = new HeaderItem(this, sortCache[x]->id(), sortCache[x]->key());
            sortCache[x]->setItem(mItems[sortCache[x]->id()] = khi);
        }
        // Add all imperfectly threaded items to a list, so they can be
        // reevaluated when a new message arrives which might be a better parent.
        // Important for messages arriving out of order.
        if (threaded && sortCache[x]->isImperfectlyThreaded()) {
            mImperfectlyThreadedList.append(sortCache[x]->item());
        }
        // Set the reverse mapping HeaderItem -> SortCacheItem. Needed for
        // keeping the data structures up to date on removal, for example.
        sortCache[x]->item()->setSortCacheItem(sortCache[x]);
    }

    if (getNestingPolicy()<2)
      for (HeaderItem *khi=static_cast<HeaderItem*>(firstChild()); khi!=0;khi=static_cast<HeaderItem*>(khi->nextSibling()))
        khi->setOpen(true);

    END_TIMER(header_creation);
    SHOW_TIMER(header_creation);

    if(sortStream) { //update the .sorted file now
        // heuristic for when it's time to rewrite the .sorted file
        if( discovered_count * discovered_count > sorted_count - deleted_count ) {
            mSortInfo.dirty = true;
        } else {
            //update the appended flag
            appended = 0;
            fseek(sortStream, KMAIL_MAGIC_HEADER_OFFSET + 16, SEEK_SET);
            fwrite(&appended, sizeof(appended), 1, sortStream);
        }
    }

    // Select a message, depending on the "When entering a folder:" setting
    CREATE_TIMER(selection);
    START_TIMER(selection);
    if(set_selection) {

        // Search for the id of the first unread/new item, should there be any
        int first_unread = -1;
        if (unread_exists) {
            HeaderItem *item = static_cast<HeaderItem*>(firstChild());
            while (item) {
              if ( ( mFolder->getMsgBase(item->msgId())->isNew() &&
                     GlobalSettings::self()->actionEnterFolder() ==
                     GlobalSettings::EnumActionEnterFolder::SelectFirstNew ) ||
                   ( ( mFolder->getMsgBase(item->msgId())->isNew() ||
                       mFolder->getMsgBase(item->msgId())->isUnread() ) &&
                     jumpToUnread ) )
              {
                first_unread = item->msgId();
                break;
              }
              item = static_cast<HeaderItem*>(item->itemBelow());
            }
        }

        // No unread message to select, so either select the newest, oldest or lastest selected
        if(first_unread == -1 ) {
            setTopItemByIndex( mTopItem );

            if ( GlobalSettings::self()->actionEnterFolder() ==
                 GlobalSettings::EnumActionEnterFolder::SelectNewest && newestItem != 0 ) {
              setCurrentItemByIndex( newestItem->msgId() );
            }
            else if ( GlobalSettings::self()->actionEnterFolder() ==
                      GlobalSettings::EnumActionEnterFolder::SelectOldest && oldestItem != 0 ) {
              setCurrentItemByIndex( oldestItem->msgId() );
            }
            else if ( mCurrentItem >= 0 )
              setCurrentItemByIndex( mCurrentItem );
            else if ( mCurrentItemSerNum > 0 )
              setCurrentItemBySerialNum( mCurrentItemSerNum );
            else
              setCurrentItemByIndex( 0 );

        // There is an unread item to select, so select it
        } else {
            setCurrentItemByIndex(first_unread);
            makeHeaderVisible();
            center( contentsX(), itemPos(mItems[first_unread]), 0, 9.0 );
        }

    // we are told to not change the selection
    } else {
        // only reset the selection if we have no current item
        if (mCurrentItem <= 0) {
          setTopItemByIndex(mTopItem);
          setCurrentItemByIndex(0);
        }
    }
    END_TIMER(selection);
    SHOW_TIMER(selection);
    if (error || (sortStream && ferror(sortStream))) {
        if ( sortStream )
            fclose(sortStream);
        unlink(TQFile::encodeName(sortFile));
        kdWarning(5006) << "Error: Failure modifying " << sortFile << " (No space left on device?)" << endl;
        kdWarning(5006) << __FILE__ << ":" << __LINE__ << endl;

        return true;
    }
    if(sortStream)
        fclose(sortStream);

    return true;
}

//-----------------------------------------------------------------------------
void KMHeaders::setCurrentItemBySerialNum( unsigned long serialNum )
{
  // Linear search == slow. Don't overuse this method.
  // It's currently only used for finding the current item again
  // after expiry deleted mails (so the index got invalidated).
  for (int i = 0; i < (int)mItems.size() - 1; ++i) {
    KMMsgBase *mMsgBase = mFolder->getMsgBase( i );
    if ( mMsgBase->getMsgSerNum() == serialNum ) {
      bool unchanged = (currentItem() == mItems[i]);
      setCurrentItem( mItems[i] );
      setSelected( mItems[i], true );
      setSelectionAnchor( currentItem() );
      if ( unchanged )
        highlightMessage( currentItem(), false );
      ensureCurrentItemVisible();
      return;
    }
  }
  // Not found. Maybe we should select the last item instead?
  kdDebug(5006) << "KMHeaders::setCurrentItem item with serial number " << serialNum << " NOT FOUND" << endl;
}

void KMHeaders::copyMessages()
{
  mCopiedMessages.clear();
  KMMessageList* list = selectedMsgs();
  for ( uint i = 0; i < list->count(); ++ i )
    mCopiedMessages << list->at( i )->getMsgSerNum();
  mMoveMessages = false;
  updateActions();
  triggerUpdate();
}

void KMHeaders::cutMessages()
{
  mCopiedMessages.clear();
  KMMessageList* list = selectedMsgs();
  for ( uint i = 0; i < list->count(); ++ i )
    mCopiedMessages << list->at( i )->getMsgSerNum();
  mMoveMessages = true;
  updateActions();
  triggerUpdate();
}

void KMHeaders::pasteMessages()
{
  new MessageCopyHelper( mCopiedMessages, folder(), mMoveMessages, TQT_TQOBJECT(this) );
  if ( mMoveMessages ) {
    mCopiedMessages.clear();
    updateActions();
  }
}

void KMHeaders::updateActions()
{
  KAction *copy = owner()->action( "copy_messages" );
  KAction *cut = owner()->action( "cut_messages" );
  KAction *paste = owner()->action( "paste_messages" );

  if ( selectedItems().isEmpty() ) {
    copy->setEnabled( false );
    cut->setEnabled( false );
  } else {
    copy->setEnabled( true );
    if ( folder() && !folder()->canDeleteMessages() )
      cut->setEnabled( false );
    else
      cut->setEnabled( true );
  }

  if ( mCopiedMessages.isEmpty() || !folder() || folder()->isReadOnly() )
    paste->setEnabled( false );
  else
    paste->setEnabled( true );
}

void KMHeaders::setCopiedMessages(const TQValueList< TQ_UINT32 > & msgs, bool move)
{
  mCopiedMessages = msgs;
  mMoveMessages = move;
  updateActions();
}

bool KMHeaders::isMessageCut(TQ_UINT32 serNum) const
{
  return mMoveMessages && mCopiedMessages.contains( serNum );
}

TQValueList< TQ_UINT32 > KMHeaders::selectedSernums()
{
  TQValueList<TQ_UINT32> list;
  for ( TQListViewItemIterator it(this); it.current(); it++ ) {
    if ( it.current()->isSelected() && it.current()->isVisible() ) {
      HeaderItem* item = static_cast<HeaderItem*>( it.current() );
      KMMsgBase *msgBase = mFolder->getMsgBase( item->msgId() );
      if ( msgBase ) {
        list.append( msgBase->getMsgSerNum() );
      }
    }
  }
  return list;
}

TQValueList< TQ_UINT32 > KMHeaders::selectedVisibleSernums()
{
  TQValueList<TQ_UINT32> list;
  TQListViewItemIterator it(this, TQListViewItemIterator::Selected|TQListViewItemIterator::Visible);
  while( it.current() ) {
    if ( it.current()->isSelected() && it.current()->isVisible() ) {
      if ( it.current()->parent() && ( !it.current()->parent()->isOpen() ) ) {
        // the item's parent is closed, don't traverse any more of this subtree
        TQListViewItem * lastAncestorWithSiblings = it.current()->parent();
        // travel towards the root until we find an ancestor with siblings
        while ( ( lastAncestorWithSiblings->depth() > 0 ) && !lastAncestorWithSiblings->nextSibling() )
          lastAncestorWithSiblings = lastAncestorWithSiblings->parent();
        // move the iterator to that ancestor's next sibling
        it = TQListViewItemIterator( lastAncestorWithSiblings->nextSibling() );
        continue;
      }
      HeaderItem *item = static_cast<HeaderItem*>(it.current());
      KMMsgBase *msgBase = mFolder->getMsgBase( item->msgId() );
      if ( msgBase ) {
        list.append( msgBase->getMsgSerNum() );
      }
    }
    ++it;
  }

  return list;
}

#include "kmheaders.moc"