\class KFadeWidgetEffect kfadewidgeteffect.h KFadeWidgetEffect
Animates changes fading the new UI over the old look.
This widget will put itself above the widget that will change and show a fading transition from
the old to the new UI. It will delete itself after the animation is finished.
Example:
KFadeWidgetEffect *animation = new KFadeWidgetEffect(widgetThatWillChange);
// do changes on widgetThatWillChange
// ...
animation->start();
The widget that changes needs to have a parent widget. KFadeWidgetEffect does not work
for toplevel widgets (windows).
Author Matthias Kretz
\since 4.1
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