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tqt3/src/kernel/qdesktopwidget_x11.cpp

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/****************************************************************************
**
** Implementation of TQDesktopWidget class.
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the TQt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
** included in the packaging of this file. Licensees holding valid TQt
** Commercial licenses may use this file in accordance with the TQt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "ntqdesktopwidget.h"
#include "ntqapplication.h"
#include "ntqobjectlist.h"
#include "qt_x11_p.h"
#include <cstdlib>
// defined in qwidget_x11.cpp
extern int qt_x11_create_desktop_on_screen;
// defined in qapplication_x11.cpp
extern Atom qt_net_workarea;
extern bool qt_net_supports(Atom atom);
// function to update the workarea of the screen
static bool qt_desktopwidget_workarea_dirty = TRUE;
void qt_desktopwidget_update_workarea()
{
qt_desktopwidget_workarea_dirty = TRUE;
}
class TQSingleDesktopWidget : public TQWidget
{
public:
TQSingleDesktopWidget();
~TQSingleDesktopWidget();
};
TQSingleDesktopWidget::TQSingleDesktopWidget()
: TQWidget( 0, "desktop", WType_Desktop )
{
}
TQSingleDesktopWidget::~TQSingleDesktopWidget()
{
while ( children() )
removeChild( children()->getFirst() );
}
class TQDesktopWidgetPrivate
{
public:
TQDesktopWidgetPrivate();
~TQDesktopWidgetPrivate();
void init();
bool use_xinerama;
int defaultScreen;
int screenCount;
TQWidget **screens;
TQRect *rects;
TQRect *workareas;
};
TQDesktopWidgetPrivate::TQDesktopWidgetPrivate()
: use_xinerama(FALSE), defaultScreen(0), screenCount(1),
screens( 0 ), rects( 0 ), workareas( 0 )
{
}
TQDesktopWidgetPrivate::~TQDesktopWidgetPrivate()
{
if ( screens ) {
for ( int i = 0; i < screenCount; ++i ) {
if (i == defaultScreen) continue;
delete screens[i];
screens[i] = 0;
}
free(screens);
}
if ( rects ) delete [] rects;
if ( workareas ) delete [] workareas;
}
void TQDesktopWidgetPrivate::init()
{
// get the screen count
int newScreenCount;
#ifndef QT_NO_XINERAMA
XineramaScreenInfo *xinerama_screeninfo = 0;
int unused;
use_xinerama = (XineramaQueryExtension(TQPaintDevice::x11AppDisplay(),
&unused, &unused) &&
XineramaIsActive(TQPaintDevice::x11AppDisplay()));
if (use_xinerama) {
xinerama_screeninfo =
XineramaQueryScreens(TQPaintDevice::x11AppDisplay(), &newScreenCount);
if (xinerama_screeninfo)
defaultScreen = 0;
} else
#endif // QT_NO_XINERAMA
{
defaultScreen = DefaultScreen(TQPaintDevice::x11AppDisplay());
newScreenCount = ScreenCount(TQPaintDevice::x11AppDisplay());
use_xinerama = false;
}
delete [] rects;
rects = new TQRect[ newScreenCount ];
delete [] workareas;
workareas = new TQRect[ newScreenCount ];
// get the geometry of each screen
int i, j, x, y, w, h;
for ( i = 0, j = 0; i < newScreenCount; i++ ) {
#ifndef QT_NO_XINERAMA
if (use_xinerama) {
x = xinerama_screeninfo[i].x_org;
y = xinerama_screeninfo[i].y_org;
w = xinerama_screeninfo[i].width;
h = xinerama_screeninfo[i].height;
} else
#endif // QT_NO_XINERAMA
{
x = 0;
y = 0;
w = WidthOfScreen(ScreenOfDisplay(TQPaintDevice::x11AppDisplay(), i));
h = HeightOfScreen(ScreenOfDisplay(TQPaintDevice::x11AppDisplay(), i));
}
workareas[i] = TQRect();
rects[j].setRect(x, y, w, h);
// overlapping?
if (j > 0 && rects[j-1].intersects(rects[j])) {
// pick the bigger one, ignore the other
if ((rects[j].width()*rects[j].height()) >
(rects[j-1].width()*rects[j-1].height()))
rects[j-1] = rects[j];
}
else
j++;
}
if (screens) {
// leaks TQWidget* pointers on purpose, can't delete them as pointer escapes
screens = (TQWidget**) realloc(screens, j * sizeof(TQWidget*));
if (j > screenCount)
memset(&screens[screenCount], 0, (j-screenCount) * sizeof(TQWidget*));
}
screenCount = j;
#ifndef QT_NO_XINERAMA
if (use_xinerama && screenCount == 1)
use_xinerama = false;
if (xinerama_screeninfo)
XFree(xinerama_screeninfo);
#endif // QT_NO_XINERAMA
}
// the TQDesktopWidget itself will be created on the default screen
// as qt_x11_create_desktop_on_screen defaults to -1
TQDesktopWidget::TQDesktopWidget()
: TQWidget( 0, "desktop", WType_Desktop )
{
d = new TQDesktopWidgetPrivate();
/*
we don't call d->init() here, since the initial resize event
will end up calling init() a second time, which is inefficient.
instead, for the sending of all posted event to the desktop
widget (including the initial resize event, which calls
d->init()).
*/
TQApplication::sendPostedEvents( this, 0 );
}
TQDesktopWidget::~TQDesktopWidget()
{
delete d;
}
bool TQDesktopWidget::isVirtualDesktop() const
{
return d->use_xinerama;
}
int TQDesktopWidget::primaryScreen() const
{
return d->defaultScreen;
}
int TQDesktopWidget::numScreens() const
{
return d->screenCount;
}
TQWidget *TQDesktopWidget::screen( int screen )
{
if (d->use_xinerama)
return this;
if ( screen < 0 || screen >= d->screenCount )
screen = d->defaultScreen;
if ( ! d->screens ) {
d->screens = (TQWidget**) calloc( d->screenCount, sizeof(TQWidget*));
d->screens[ d->defaultScreen ] = this;
}
if ( ! d->screens[screen] || // not created yet
! d->screens[screen]->isDesktop() ) { // reparented away
qt_x11_create_desktop_on_screen = screen;
d->screens[screen] = new TQSingleDesktopWidget;
qt_x11_create_desktop_on_screen = -1;
}
return d->screens[screen];
}
const TQRect& TQDesktopWidget::availableGeometry( int screen ) const
{
if ( qt_desktopwidget_workarea_dirty ) {
// the workareas are dirty, invalidate them
for ( int i = 0; i < d->screenCount; ++i )
d->workareas[i] = TQRect();
qt_desktopwidget_workarea_dirty = FALSE;
}
if ( screen < 0 || screen >= d->screenCount )
screen = d->defaultScreen;
if ( d->workareas[screen].isValid() )
return d->workareas[screen];
if ( ! isVirtualDesktop() && qt_net_supports( qt_net_workarea ) ) {
Atom ret;
int format, e;
unsigned char *data = 0;
unsigned long nitems, after;
e = XGetWindowProperty( TQPaintDevice::x11AppDisplay(),
TQPaintDevice::x11AppRootWindow( screen ),
qt_net_workarea, 0, 4, False, XA_CARDINAL,
&ret, &format, &nitems, &after, &data );
if (e == Success && ret == XA_CARDINAL &&
format == 32 && nitems == 4) {
long *workarea = (long *) data;
d->workareas[screen].setRect( workarea[0], workarea[1],
workarea[2], workarea[3] );
} else {
d->workareas[screen] = screenGeometry(screen);
}
if ( data )
XFree( data );
} else {
d->workareas[screen] = screenGeometry(screen);
}
return d->workareas[screen];
}
const TQRect& TQDesktopWidget::screenGeometry( int screen ) const
{
if ( screen < 0 || screen >= d->screenCount )
screen = d->defaultScreen;
return d->rects[ screen ];
}
int TQDesktopWidget::screenNumber( TQWidget *widget ) const
{
if ( !widget )
return d->defaultScreen;
#ifndef QT_NO_XINERAMA
if (d->use_xinerama) {
// this is how we do it for xinerama
TQRect frame = widget->frameGeometry();
if ( !widget->isTopLevel() )
frame.moveTopLeft( widget->mapToGlobal( TQPoint( 0, 0 ) ) );
int maxSize = -1;
int maxScreen = -1;
for ( int i = 0; i < d->screenCount; ++i ) {
TQRect sect = d->rects[i].intersect( frame );
int size = sect.width() * sect.height();
if ( size > maxSize && sect.width() > 0 && sect.height() > 0 ) {
maxSize = size;
maxScreen = i;
}
}
return maxScreen;
}
#endif // QT_NO_XINERAMA
return widget->x11Screen();
}
int TQDesktopWidget::screenNumber( const TQPoint &point ) const
{
for ( int i = 0; i < d->screenCount; ++i ) {
if ( d->rects[i].contains( point ) )
return i;
}
return -1;
}
void TQDesktopWidget::resizeEvent( TQResizeEvent *event )
{
d->init();
qt_desktopwidget_workarea_dirty = TRUE;
TQWidget::resizeEvent( event );
}