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Cover browser: Debounce re-renders

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Only re-render cover browser 100msec after resize/slide
change/reset/etc. Avoids unnecessary work, if a
dataChanged/setSlideIndex/resize occur in quick succession,
such as during program startup
This commit is contained in:
Kovid Goyal 2015-04-30 13:28:56 +05:30
parent ba1d07f73d
commit 9b131a5247
1 changed files with 10 additions and 10 deletions
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20
src/calibre/gui2/pictureflow/pictureflow.cpp
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@ -411,7 +411,7 @@ private:
QRect renderSlide(const SlideInfo &slide, int alpha=256, int col1=-1, int col=-1);
QRect renderCenterSlide(const SlideInfo &slide);
QImage* surface(int slideIndex);
void triggerRender();
void triggerRender(int after_msecs);
void resetSlides();
void render_text(QPainter*, int);
};
@ -447,7 +447,7 @@ PictureFlowPrivate::PictureFlowPrivate(PictureFlow* w, int queueLength_)
void PictureFlowPrivate::dataChanged() {
surfaceCache.clear();
resetSlides();
triggerRender();
triggerRender(100);
}
void PictureFlowPrivate::setImages(FlowImages *images)
@ -474,7 +474,7 @@ void PictureFlowPrivate::setSlideSize(QSize size)
slideWidth = size.width();
slideHeight = size.height();
recalc(buffer.width(), buffer.height());
triggerRender();
triggerRender(100);
}
QImage PictureFlowPrivate::slide(int index) const
@ -500,7 +500,7 @@ void PictureFlowPrivate::setCurrentSlide(int index)
target = centerIndex;
slideFrame = ((long long)centerIndex) << 16;
resetSlides();
triggerRender();
triggerRender(100);
widget->emitcurrentChanged(centerIndex);
}
@ -510,7 +510,7 @@ bool PictureFlowPrivate::showReflections() const {
void PictureFlowPrivate::setShowReflections(bool show) {
doReflections = show;
triggerRender();
triggerRender(100);
}
void PictureFlowPrivate::showPrevious()
@ -566,7 +566,7 @@ void PictureFlowPrivate::resize(int w, int h)
fontSize = MAX(int(h/15.), 12);
recalc(w, h);
resetSlides();
triggerRender();
triggerRender(100);
}
@ -702,9 +702,9 @@ QImage* PictureFlowPrivate::surface(int slideIndex)
// Schedules rendering the slides. Call this function to avoid immediate
// render and thus cause less flicker.
void PictureFlowPrivate::triggerRender()
void PictureFlowPrivate::triggerRender(int after_msecs)
{
triggerTimer.start();
triggerTimer.start(after_msecs);
}
void PictureFlowPrivate::render_text(QPainter *painter, int index) {
@ -1150,7 +1150,7 @@ void PictureFlowPrivate::updateAnimation()
{
resetSlides();
animateTimer.stop();
triggerRender();
triggerRender(0);
step = 0;
fade = 256;
return;
@ -1193,7 +1193,7 @@ void PictureFlowPrivate::updateAnimation()
if(target > index) if(step < 0)
step = 1;
triggerRender();
triggerRender(0);
}