126 lines
4 KiB
C++
126 lines
4 KiB
C++
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/*****************************************************************
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This file is part of the KDE project.
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Copyright (C) 2009 Lubos Lunak <l.lunak@kde.org>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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******************************************************************/
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#include "paintredirector.h"
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#include <kdebug.h>
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#include <qevent.h>
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#include <qpainter.h>
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namespace KWin
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{
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PaintRedirector::PaintRedirector( QWidget* w )
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: widget( w )
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, recursionCheck( false )
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{
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timer.setSingleShot( true );
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connect( &timer, SIGNAL( timeout()), SIGNAL( paintPending()));
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added( w );
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}
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QPixmap PaintRedirector::performPendingPaint()
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{
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//qDebug() << "### performing paint, pending:" << pending.boundingRect();
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QPixmap pixmap( pending.boundingRect().size());
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pixmap.fill( Qt::transparent );
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recursionCheck = true;
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// do not use DrawWindowBackground, it's ok to be transparent
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widget->render( &pixmap, QPoint(), pending.boundingRect(), QWidget::DrawChildren );
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recursionCheck = false;
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pending = QRegion();
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return pixmap;
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}
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bool PaintRedirector::isToolTip( QWidget *object ) const
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{
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// ### We need a more reliable way of doing this
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return object->metaObject()->className() == QString("QWidget") &&
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object->objectName() != QString("decoration widget");
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}
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bool PaintRedirector::eventFilter( QObject* o, QEvent* e )
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{
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switch( e->type())
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{
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case QEvent::ChildAdded:
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{
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QChildEvent* c = static_cast< QChildEvent* >( e );
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if( c->child()->isWidgetType() && !isToolTip( static_cast< QWidget* >( c->child() ) ) )
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added( static_cast< QWidget* >( c->child()));
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break;
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}
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case QEvent::ChildRemoved:
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{
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QChildEvent* c = static_cast< QChildEvent* >( e );
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if( c->child()->isWidgetType())
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removed( static_cast< QWidget* >( c->child()));
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break;
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}
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case QEvent::Paint:
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{
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if( !recursionCheck )
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{
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QPaintEvent* pe = static_cast< QPaintEvent* >( e );
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QWidget* w = static_cast< QWidget* >( o );
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pending |= pe->region().translated( w->mapTo( widget, QPoint( 0, 0 )));
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timer.start( 0 );
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return true; // filter out
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}
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}
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default:
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break;
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}
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return false;
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}
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QRegion PaintRedirector::pendingRegion() const
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{
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return pending;
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}
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void PaintRedirector::added( QWidget* w )
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{
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w->installEventFilter( this );
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foreach( QObject* o, w->children())
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{
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if( o->isWidgetType() && !isToolTip( static_cast< QWidget* >( o ) ) )
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added( static_cast< QWidget* >( o ));
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}
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}
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void PaintRedirector::removed( QWidget* w )
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{
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foreach( QObject* o, w->children())
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{
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if( o->isWidgetType())
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removed( static_cast< QWidget* >( o ));
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}
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w->installEventFilter( this );
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}
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} // namespace
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#include "paintredirector.moc"
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