Mario Fetka
129 lines
3.2 KiB
C++
129 lines
3.2 KiB
C++
/***************************************************************************
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faderwidget.h - smoothly fades one widget to reveal a second
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based on the Qt "Fade-Effects" demo; updated to use a
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QWidget source.
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-------------------
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begin : Wednesday 05 Jan 2011
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copyright : (C) 2011 by Adam Goossens
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email : adam.goossens@gmail.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include <QTimeLine>
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#include <QPainter>
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#include <QSize>
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#include <stdint.h>
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#include "../kmessdebug.h"
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#include "faderwidget.h"
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/**
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* Construct a new FaderWidget.
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*
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* \arg begin is the source widget. A pixmap will be grabbed from this widget and will be
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* used as the fading source.
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*
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* \arg parent must be a valid QWidget and should be the widget you are fading out to.
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*
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* @param begin Source widget which will "fade out"
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* @param parent Widget which is being revealed.
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*/
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FaderWidget::FaderWidget( QWidget *begin, QWidget *parent )
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: QWidget( parent )
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{
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timeline_ = new QTimeLine( 1000, this ); // 1sec fade by default
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timeline_->setFrameRange( 1000, 0 );
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connect( timeline_, SIGNAL( frameChanged( int ) ),
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this, SLOT( update() ) );
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KMESS_ASSERT( parent );
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KMESS_ASSERT( begin );
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resize( parent->size() );
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setAttribute( Qt::WA_DeleteOnClose );
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pixmap_ = QPixmap::grabWidget( begin );
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}
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/**
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* Change the duration of the fade.
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*
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* The default is 1000ms (1sec)
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* @param milliseconds Fade duration
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*/
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void FaderWidget::setDuration( uint16_t milliseconds )
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{
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if ( timeline_->state() == QTimeLine::Running )
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{
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kWarning() << "Cannot change duration whilst fade is running";
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return;
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}
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timeline_->setDuration( milliseconds );
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}
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/**
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* Start the fade effect.
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*
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* Calling this whilst the fade is already running has no effect.
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*/
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void FaderWidget::start()
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{
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if ( timeline_->state() == QTimeLine::Running )
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{
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kWarning() << "Fade is already running.";
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return;
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}
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timeline_->start();
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show();
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}
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/**
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* Stop the fade effect.
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*
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* Calling this whilst already stopped has no effect.
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*/
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void FaderWidget::stop()
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{
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timeline_->stop();
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}
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/**
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* Paint the grabbed pixmap with a given opacity over our parent widget.
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*/
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void FaderWidget::paintEvent( QPaintEvent * )
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{
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QPainter painter( this );
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qreal frame = timeline_->currentFrame();
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painter.setOpacity( frame / 1000 ); // 1000 frames possible
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painter.drawPixmap( 0, 0, pixmap_ );
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if ( frame <= 0 )
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{
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close();
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}
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}
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#include "faderwidget.moc"
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