1berry/qtbase
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Reduce excessive painting caused by transient scrollbars

Browse Source 
The step logic in scrollByDelta() made scrollbar position to go
temporarily outside its min/max boundaries, and then setValue()
corrected it immediately back within its bounds. The false change
notifications caused by this position vs. value ping pong caused
plenty of unnecessary updates.

Task-number: QTBUG-30316
Change-Id: I32dd5bdb7b0c578dfc5dfa1deecceb19bb98a2b3
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@theqtcompany.com>
This commit is contained in:
J-P Nurmi 2015-01-10 20:01:38 +01:00
parent 940530ab67
commit ce84a1bde3
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/widgets/widgets/qabstractslider.cpp
View File

@ -728,7 +728,7 @@ bool QAbstractSliderPrivate::scrollByDelta(Qt::Orientation orientation, Qt::Keyb
stepsToScroll = -stepsToScroll;
int prevValue = value;
position = overflowSafeAdd(stepsToScroll); // value will be updated by triggerAction()
position = bound(overflowSafeAdd(stepsToScroll)); // value will be updated by triggerAction()
q->triggerAction(QAbstractSlider::SliderMove);
if (prevValue == value) {