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594 lines
15 KiB
594 lines
15 KiB
/* This file is part of the KDE project
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Copyright (C) 2001 Wilco Greven <greven@kde.org>
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Copyright (C) 2002-2004 Stefan Kebekus <kebekus@kde.org>
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Copyright (C) 2004-2005 Wilfried Huss <Wilfried.Huss@gmx.at>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <kdebug.h>
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#include <tqcursor.h>
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#include <tqpainter.h>
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#include <tqrect.h>
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#include <math.h>
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#include "pageView.h"
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#include "pageNumber.h"
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PageView::PageView( TQWidget* parent, const char* name )
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: TQScrollView( parent, name, WStaticContents | WNoAutoErase)
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{
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moveTool = true;
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widgetList = 0;
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viewport()->setFocusPolicy(TQWidget::StrongFocus);
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setResizePolicy(TQScrollView::Manual);
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setVScrollBarMode(TQScrollView::Auto);
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setHScrollBarMode(TQScrollView::Auto);
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viewport()->setBackgroundMode(TQt::NoBackground);
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setResizePolicy(Manual);
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setDragAutoScroll(false);
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enableClipper(true);
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nrCols = 1;
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nrRows = 1;
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continuousViewmode = true;
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fullScreen = false;
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connect(this, TQT_SIGNAL(contentsMoving(int, int)), this, TQT_SLOT(calculateCurrentPageNumber(int, int)));
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}
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void PageView::addChild( TQPtrVector<DocumentWidget> *wdgList )
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{
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if( wdgList == 0 ) {
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kdError(1223) << "PageView::addChild(...) called with invalid arguments" << endl;
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return;
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}
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widgetList = wdgList;
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layoutPages();
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}
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bool PageView::atTop() const
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{
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return verticalScrollBar()->value() == verticalScrollBar()->minValue();
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}
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bool PageView::atBottom() const
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{
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return verticalScrollBar()->value() == verticalScrollBar()->maxValue();
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}
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bool PageView::readUp()
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{
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if( atTop() )
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return false;
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else {
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// Coordinate of the top of the viewport
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int top = contentsY();
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DocumentWidget* widget = 0;
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// Find the widget(s) that intersect the top of the viewport
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// TODO: It would be better to use a binary search.
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for(TQ_UINT16 i=0; i<widgetList->size(); i++)
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{
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widget = widgetList->at(i);
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if (childY(widget) < top && childY(widget) + widget->height() > top)
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{
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// Draw scrollguide
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widget->drawScrollGuide(top - childY(widget));
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}
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}
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int newValue = TQMAX( verticalScrollBar()->value() - (int)(height() * 0.9),
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verticalScrollBar()->minValue() );
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verticalScrollBar()->setValue( newValue );
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return true;
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}
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}
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bool PageView::readDown()
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{
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if( atBottom() )
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return false;
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else {
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// Coordinate of the bottom of the viewport
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int bottom = contentsY() + visibleHeight();
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DocumentWidget* widget = 0;
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// Find the widget(s) that intersect the bottom of the viewport
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// TODO: It would be better to use a binary search.
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for(TQ_UINT16 i=0; i<widgetList->size(); i++)
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{
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widget = widgetList->at(i);
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if (childY(widget) < bottom && childY(widget) + widget->height() > bottom)
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{
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// Draw scrollguide
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widget->drawScrollGuide(bottom - childY(widget));
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}
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}
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int newValue = TQMIN( verticalScrollBar()->value() + (int)(height() * 0.9),
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verticalScrollBar()->maxValue() );
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verticalScrollBar()->setValue( newValue );
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return true;
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}
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}
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void PageView::scrollRight()
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{
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horizontalScrollBar()->addLine();
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}
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void PageView::scrollLeft()
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{
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horizontalScrollBar()->subtractLine();
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}
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void PageView::scrollDown()
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{
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verticalScrollBar()->addLine();
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}
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void PageView::scrollUp()
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{
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verticalScrollBar()->subtractLine();
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}
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void PageView::scrollBottom()
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{
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verticalScrollBar()->setValue( verticalScrollBar()->maxValue() );
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}
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void PageView::scrollTop()
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{
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verticalScrollBar()->setValue( verticalScrollBar()->minValue() );
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}
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void PageView::keyPressEvent( TQKeyEvent* e )
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{
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switch ( e->key() ) {
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case Key_Up:
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scrollUp();
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break;
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case Key_Down:
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scrollDown();
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break;
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case Key_Left:
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scrollLeft();
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break;
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case Key_Right:
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scrollRight();
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break;
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default:
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e->ignore();
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return;
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}
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e->accept();
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}
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void PageView::contentsMousePressEvent( TQMouseEvent* e )
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{
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if (e->button() == TQt::LeftButton)
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{
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if (moveTool)
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{
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setCursor(TQt::SizeAllCursor);
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dragGrabPos = e->globalPos();
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}
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else
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{
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// we are in selection mode
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}
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}
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else
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{
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setCursor(TQt::arrowCursor);
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}
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}
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void PageView::contentsMouseReleaseEvent( TQMouseEvent* )
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{
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setCursor(TQt::arrowCursor);
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}
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void PageView::contentsMouseMoveEvent( TQMouseEvent* e )
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{
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TQPoint newPos = e->globalPos();
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if (e->state() == TQt::LeftButton && moveTool)
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{
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TQPoint delta = dragGrabPos - newPos;
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scrollBy(delta.x(), delta.y());
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}
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dragGrabPos = newPos;
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}
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void PageView::viewportResizeEvent( TQResizeEvent* e )
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{
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TQScrollView::viewportResizeEvent( e );
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if (!widgetList)
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return;
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layoutPages();
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emit viewSizeChanged( viewport()->size() );
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}
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void PageView::setNrColumns( TQ_UINT8 cols )
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{
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nrCols = cols;
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}
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void PageView::setNrRows( TQ_UINT8 rows )
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{
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nrRows = rows;
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}
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void PageView::setContinuousViewMode(bool continuous)
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{
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continuousViewmode = continuous;
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}
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bool PageView::singlePageFullScreenMode()
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{
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return (nrCols == 1 && nrRows == 1 && !continuousViewmode && fullScreen);
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}
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void PageView::slotShowScrollbars(bool status)
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{
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if (status == true) {
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setVScrollBarMode(TQScrollView::Auto);
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setHScrollBarMode(TQScrollView::Auto);
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} else {
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setVScrollBarMode(TQScrollView::AlwaysOff);
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setHScrollBarMode(TQScrollView::AlwaysOff);
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}
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}
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void PageView::setFullScreenMode(bool fullScreen)
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{
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this -> fullScreen = fullScreen;
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if (fullScreen == true)
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{
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setVScrollBarMode(TQScrollView::AlwaysOff);
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setHScrollBarMode(TQScrollView::AlwaysOff);
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oldFrameStyle = frameStyle();
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setFrameStyle(TQFrame::NoFrame);
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backgroundColor = viewport()->paletteBackgroundColor();
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if (singlePageFullScreenMode())
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{
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viewport()->setPaletteBackgroundColor( TQt::black ) ;
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}
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}
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else
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{
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viewport()->setPaletteBackgroundColor( backgroundColor ) ;
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setFrameStyle(oldFrameStyle);
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}
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}
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void PageView::layoutPages(bool zoomChanged)
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{
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// Paranoid safety check
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if (widgetList == 0)
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return;
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// If there are no widgets, e.g. because the last widget has been
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// removed, the matter is easy: set the contents size to 0. If there
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// are no widgets because previously existing widgets were removed
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// (we detect that by looking at the contentsWidth and -Height).
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if (widgetList->isEmpty()) {
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if ((contentsWidth() != 0) || (contentsHeight() != 0)) {
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TQScrollView::resizeContents(0,0);
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}
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return;
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}
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// Ok, now we are in a situation where we do have some widgets that
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// shall be centered.
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int distance = distanceBetweenWidgets;
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if (singlePageFullScreenMode())
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{
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// In single page fullscreen mode we don't want a margin around the pages
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distance = 0;
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}
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TQMemArray<TQ_UINT32> colWidth(nrCols);
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for(TQ_UINT8 i=0; i<colWidth.size(); i++)
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colWidth[i] = 0;
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TQ_UINT16 numRows;
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if(nrCols <= 2)
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{
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numRows = (widgetList->size()+2*nrCols-2) / nrCols;
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}
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else
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{
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numRows = (TQ_INT16)ceil(((double)widgetList->size()) / nrCols);
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}
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TQMemArray<TQ_UINT32> rowHeight(numRows);
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for(TQ_UINT16 i=0; i<rowHeight.size(); i++)
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rowHeight[i] = 0;
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// Now find the widths and heights of the columns
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for(TQ_UINT16 i=0; i<widgetList->size(); i++)
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{
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TQ_UINT8 col;
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TQ_UINT16 row;
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if (nrCols == 2) {
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// In two-column display, start with the right column
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col = (i+1+nrCols) % nrCols;
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row = (i+1+nrCols) / nrCols - 1;
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} else {
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col = (i+nrCols) % nrCols;
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row = (i+nrCols) / nrCols - 1;
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}
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colWidth[col] = TQMAX(colWidth[col], (TQ_UINT32)widgetList->at(i)->pageSize().width());
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rowHeight[row] = TQMAX(rowHeight[row], (TQ_UINT32)widgetList->at(i)->pageSize().height());
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}
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// Calculate the total width and height of the display
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TQ_UINT32 totalHeight = 0;
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for(TQ_UINT16 i=0; i<rowHeight.size(); i++)
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totalHeight += rowHeight[i];
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totalHeight += (numRows+1)*distance;
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TQ_UINT32 totalWidth = 0;
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for(TQ_UINT8 i=0; i<colWidth.size(); i++)
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totalWidth += colWidth[i];
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totalWidth += (nrCols+1)*distance;
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TQSize newViewportSize = viewportSize( totalWidth, totalHeight );
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TQ_UINT32 centeringLeft = 0;
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if( (TQ_UINT32)newViewportSize.width() > totalWidth )
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centeringLeft = ( newViewportSize.width() - totalWidth )/2;
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TQ_UINT32 centeringTop = 0;
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if( (TQ_UINT32)newViewportSize.height() > totalHeight )
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centeringTop = ( newViewportSize.height() - totalHeight)/2;
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// Resize the viewport
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if (((TQ_UINT32)contentsWidth() != totalWidth) || ((TQ_UINT32)contentsHeight() != totalHeight))
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{
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// Calculate the point in the coordinates of the contents which is currently at the center of the viewport.
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TQPoint midPoint = TQPoint(visibleWidth() / 2 + contentsX(), visibleHeight() / 2 + contentsY());
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double midPointRatioX = (double)(midPoint.x()) / contentsWidth();
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double midPointRatioY = (double)(midPoint.y()) / contentsHeight();
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resizeContents(totalWidth,totalHeight);
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// If the zoom changed recenter the former midPoint
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if (zoomChanged)
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center((int)(contentsWidth() * midPointRatioX), (int)(contentsHeight() * midPointRatioY));
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}
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// Finally, calculate the left and top coordinates of each row and
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// column, respectively
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TQMemArray<TQ_UINT32> colLeft(nrCols);
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colLeft[0] = distance;
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for(TQ_UINT8 i=1; i<colLeft.size(); i++)
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colLeft[i] = colLeft[i-1]+colWidth[i-1]+distance;
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TQMemArray<TQ_UINT32> rowTop(numRows);
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rowTop[0] = distance;
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for(TQ_UINT16 i=1; i<rowTop.size(); i++)
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rowTop[i] = rowTop[i-1]+rowHeight[i-1]+distance;
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for(TQ_UINT16 i=0; i<widgetList->size(); i++)
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{
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TQ_UINT8 col;
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TQ_UINT16 row;
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if (nrCols == 2)
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{
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// In two column-mode start with the right column.
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col = (i+nrCols-1) % nrCols;
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row = (i+nrCols-1) / nrCols;
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}
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else
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{
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col = (i+nrCols) % nrCols;
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row = i / nrCols;
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}
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if (nrCols == 2)
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{
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// in 2-column mode right justify the first column, and leftjustify the second column
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int width = widgetList->at(i)->width();
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int left;
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if (col == 0)
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left = centeringLeft + colLeft[col] + colWidth[col]-width + distance/2;
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else
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left = centeringLeft + colLeft[col];
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moveChild( widgetList->at(i), left, centeringTop+rowTop[row]);
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}
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else
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{
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// in single column and overview mode center the widgets
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int widgetWidth = widgetList->at(i)->width();
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int left = centeringLeft + colLeft[col] + ((int)colWidth[col]-widgetWidth)/2;
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moveChild(widgetList->at(i), left, centeringTop+rowTop[row]);
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}
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}
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calculateCurrentPageNumber();
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}
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void PageView::contentsWheelEvent ( TQWheelEvent * e )
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{
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emit(wheelEventReceived(e));
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}
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void PageView::moveViewportToWidget(TQWidget* widget, int y)
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{
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int verticalPos = 0;
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int verticalPosTop = 0;
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if (y != 0)
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{
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verticalPosTop = childY(widget) + y - visibleHeight()/2;
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verticalPos = childY(widget) + y;
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}
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else
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{
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verticalPos = childY(widget) - distanceBetweenWidgets;
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verticalPosTop = verticalPos;
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}
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if (nrCols == 1)
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{
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// In single column viewmodes, we change the vertical position only, to make it
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// easier to work with high zoomlevels where not the whole pagewidth is visible.
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// TODO: Smarter algorithm also for continuous facing viewmode.
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int top = (int)(contentsY() + 0.1 * visibleHeight());
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int bottom = (int)(contentsY() + 0.9 * visibleHeight());
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// Move the viewport if the target is currently not visible, or lies at the edge
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// of the viewport. If y = 0 always move the top of the targetpage to the top edge
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// of the viewport.
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if (verticalPos < top || verticalPos > bottom || y == 0)
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{
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setContentsPos(contentsX(), verticalPosTop);
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}
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}
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else
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{
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setContentsPos(childX(widget) - distanceBetweenWidgets, verticalPosTop);
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}
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}
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void PageView::viewportPaintEvent(TQPaintEvent* e)
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{
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// Region from which rectangles occupied by child widgets will by substracted.
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TQRegion backgroundArea(e->rect());
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if (widgetList != 0)
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{
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for (unsigned int i = 0; i < widgetList->count(); i++)
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{
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DocumentWidget* item = widgetList->at(i);
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// Check if the Widget needs to be updated.
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if (!item->geometry().intersects(e->rect()))
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continue;
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TQRect widgetGeometry = item->geometry();
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// Draw the widget.
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if (e->rect().intersects(widgetGeometry))
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{
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TQRect widgetRect = e->rect().intersect(widgetGeometry);
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widgetRect.moveBy(-widgetGeometry.left(), -widgetGeometry.top());
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item->update(widgetRect);
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}
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// Substract the painted area.
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backgroundArea -= widgetGeometry.intersect(e->rect());
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}
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}
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// Paint the background.
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TQPainter p(viewport());
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TQMemArray<TQRect> backgroundRects = backgroundArea.rects();
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for (unsigned int i = 0; i < backgroundRects.count(); i++)
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p.fillRect(backgroundRects[i], colorGroup().mid());
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}
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void PageView::calculateCurrentPageNumber(int x, int y)
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{
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// Safety check
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if (widgetList == 0)
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return;
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TQRect viewportRect(x, y, visibleWidth(), visibleHeight());
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//kdDebug() << "viewportRect(" << viewportRect.x() << ", " << viewportRect.y() << ", "
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// << viewportRect.width() << ", " << viewportRect.height() << ")" << endl;
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int maxVisiblePixels = 0;
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DocumentWidget* _currentWidget = 0;
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for (TQ_UINT16 i = 0; i < widgetList->size(); i++)
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{
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DocumentWidget* documentWidget = widgetList->at(i);
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// Safety check
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if (documentWidget == 0)
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continue;
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// Check if the Widget is visible
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int cx = childX(documentWidget);
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int cy = childY(documentWidget);
|
|
TQRect widgetRect(cx, cy, documentWidget->width(), documentWidget->height());
|
|
bool isVisible = widgetRect.intersects(viewportRect);
|
|
|
|
if (!isVisible)
|
|
continue;
|
|
|
|
// Calculate the number of visible pixels of the widget
|
|
TQRect visibleRect = widgetRect.intersect(viewportRect);
|
|
int visiblePixels = visibleRect.width() * visibleRect.height();
|
|
|
|
//kdDebug() << visiblePixels << " pixels are visible of page " << documentWidget->getPageNumber() << endl;
|
|
|
|
// If a bigger part of this widget as of the previous widgets is visible make it the current widget.
|
|
if (maxVisiblePixels < visiblePixels)
|
|
{
|
|
maxVisiblePixels = visiblePixels;
|
|
_currentWidget = documentWidget;
|
|
}
|
|
}
|
|
|
|
// No page is visible
|
|
if (_currentWidget == 0)
|
|
return;
|
|
|
|
// Return the number of the current page
|
|
emit currentPageChanged(_currentWidget->getPageNumber());
|
|
}
|
|
|
|
void PageView::calculateCurrentPageNumber()
|
|
{
|
|
calculateCurrentPageNumber(contentsX(), contentsY());
|
|
}
|
|
|
|
void PageView::slotEnableMoveTool(bool enable)
|
|
{
|
|
moveTool = enable;
|
|
}
|
|
|
|
#include "pageView.moc"
|