KSplash engine Moodin - splash screen engine
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ksplash-engine-moodin/src/effectwidget.cpp

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/***************************************************************************
* Copyright Sean Meiners 2004 <Sean.Meiners@LinspireInc.com> *
* Copyright (C) by *
* - 2005: Christian Leh <moodwrod@web.de> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License (version 2) as *
* published by the Free Software Foundation. (The original KSplash/ML *
* codebase (upto version 0.95.3) is BSD-licensed.) *
* *
***************************************************************************/
#include <tqwidget.h>
#include <tqstyle.h>
#include <tqtimer.h>
#include <tqpainter.h>
#include <tqimage.h>
#include "effectwidget.h"
TQImage* EffectWidget::bgImage = 0;
EffectWidget::EffectWidget(TQWidget* parent, const char* name)
:TQWidget(parent, name)
{
timer = 0;
delayMS = 20;
currentStep = 0;
totalSteps = 0;
playing = false;
loop = false;
beginOpacity = 20.0;
endOpacity = 80.0;
setBackgroundMode(NoBackground);
setBackgroundOrigin(TQWidget::ParentOrigin);
updateCache();
}
void EffectWidget::setImage(TQImage *i)
{
image = i;
}
void EffectWidget::setDelay(int delayInMS)
{
delayMS = delayInMS;
if (timer)
timer->changeInterval(delayMS);
}
void EffectWidget::setLoop(bool loop)
{
this->loop = loop;
}
void EffectWidget::setSteps(int steps)
{
totalSteps = steps;
}
void EffectWidget::start()
{
if ((playing) || (!image) || (totalSteps < 1) || (image->isNull()))
return;
if (!timer)
{
timer = new TQTimer(this);
connect(timer,TQT_SIGNAL(timeout()),this,TQT_SLOT(timerTick()));
}
playing = true;
update();
timer->start(delayMS);
}
void EffectWidget::stop()
{
if ((!playing) || (!timer))
return;
timer->stop();
playing = false;
}
void EffectWidget::setStart(float begin, float end, bool reverse)
{
beginOpacity = begin;
endOpacity = end - beginOpacity;
if (reverse)
{
float h = beginOpacity;
beginOpacity = endOpacity;
endOpacity = h;
}
}
void EffectWidget::rewind()
{
stop();
currentStep = 0;
}
void EffectWidget::timerTick()
{
if (loop)
{
currentStep ++;
currentStep %= totalSteps;
}
else if (currentStep + 1 < totalSteps)
currentStep ++;
else
timer->stop();
update();
}
void EffectWidget::moveEvent(TQMoveEvent *)
{
updateCache();
}
void EffectWidget::resizeEvent(TQResizeEvent *)
{
updateCache();
}
void EffectWidget::updateCache()
{
if (!bgImage)
return;
TQPoint pos(mapToParent(TQPoint(0, 0)));
background = bgImage->copy(pos.x(), pos.y(), width(), height());
bitBlt(this, 0, 0, &background);
}
void EffectWidget::paintEvent(TQPaintEvent *)
{
if (background.isNull())
return;
TQImage upper = image->copy();
TQImage lower = background.copy();
KImageEffect::blendOnLower(upper, lower, KImageEffect::Centered, (currentStep + 1 == totalSteps) ? 1.0 : endOpacity / float(totalSteps) * float(currentStep) + beginOpacity);
bitBlt(this, 0, 0, &lower);
}
#include "effectwidget.moc"