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| author | Richard Moe Gustavsen <richard.gustavsen@nokia.com> | 2009-12-07 14:02:01 (GMT) |
|---|---|---|
| committer | Richard Moe Gustavsen <richard.gustavsen@nokia.com> | 2009-12-07 14:06:07 (GMT) |
| commit | 5cd4bad136878af59d368b1749a76b9cbbd246ec (patch) | |
| tree | 17d3db0e9f3ad910407df103b2f93fdd92067a64 | |
| parent | 35a740fa663d4669a45ada9c37c46546e59bbb82 (diff) | |
| download | Qt-5cd4bad136878af59d368b1749a76b9cbbd246ec.zip Qt-5cd4bad136878af59d368b1749a76b9cbbd246ec.tar.gz Qt-5cd4bad136878af59d368b1749a76b9cbbd246ec.tar.bz2 | |
Fix performance issue with live resize
Calling [NSView addTrackingArea] is slow. So doing this for
views that are not even visible on screen is unnecesary. This
patch will greatly improve the speed for some (perhaps extreme)
cases.
Task-number: QT-1610
Reviewed-by: MortenS
| -rw-r--r-- | src/gui/kernel/qcocoaview_mac.mm | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/gui/kernel/qcocoaview_mac.mm b/src/gui/kernel/qcocoaview_mac.mm index 212684b..1039a75 100644 --- a/src/gui/kernel/qcocoaview_mac.mm +++ b/src/gui/kernel/qcocoaview_mac.mm @@ -555,6 +555,10 @@ extern "C" { - (void)updateTrackingAreas { + // [NSView addTrackingArea] is slow, so bail out early if we can: + if (NSIsEmptyRect([self visibleRect])) + return; + QMacCocoaAutoReleasePool pool; if (NSArray *trackingArray = [self trackingAreas]) { NSUInteger size = [trackingArray count]; |