path: root/src/corelib
diff options
authorShawn Rutledge <>2016-04-22 15:30:26 +0200
committerShawn Rutledge <>2016-05-15 08:05:29 +0000
commit28fab275033a6b4f8d6e78da0f729837144b0420 (patch)
treef85e7c891df3b5518c2f58d4573e8a55215c5e50 /src/corelib
parentdc40abe925db4a6d4f4236f61bb0c55b585c75da (diff)
add AA_CompressHighFrequencyEvents to control compression on xcb
7edd10e6c added this compression feature, but some applications may need to disable it. [ChangeLog][X11] It's now possible to unset AA_CompressHighFrequencyEvents to disable the new X event compression feature that was added in 5.6.0. This is a replacement for the WA_NoX11EventCompression flag in Qt 4. Task-number: QTBUG-44964 Change-Id: I37a9c8a4831f1c02eda0f03b54125f3255d25500 Reviewed-by: Gatis Paeglis <>
Diffstat (limited to 'src/corelib')
2 files changed, 12 insertions, 0 deletions
diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index c73ceb9503..2a0b8461cd 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -508,6 +508,7 @@ public:
AA_UseStyleSheetPropagationInWidgetStyles = 22, // ### Qt 6: remove me
AA_DontUseNativeDialogs = 23,
AA_SynthesizeMouseForUnhandledTabletEvents = 24,
+ AA_CompressHighFrequencyEvents = 25,
// Add new attributes before this line
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index 60ce1fc916..3c53a23896 100644
--- a/src/corelib/global/qnamespace.qdoc
+++ b/src/corelib/global/qnamespace.qdoc
@@ -239,6 +239,17 @@
to mouse events instead. This attribute is enabled
by default. This value has been added in Qt 5.7.
+ \value AA_CompressHighFrequencyEvents Enables compression of certain frequent events.
+ On the X11 windowing system, the default value is true, which means that
+ QEvent::MouseMove, QEvent::TouchUpdate, and changes in window size and
+ position will be combined whenever they occur more frequently than the
+ application handles them, so that they don't accumulate and overwhelm the
+ application later. On other platforms, the default is false.
+ (In the future, the compression feature may be implemented across platforms.)
+ You can test the attribute to see whether compression is enabled.
+ If your application needs to handle all events with no compression,
+ you can unset this attribute. This value has been added in Qt 5.7.
The following values are obsolete:
\value AA_ImmediateWidgetCreation This attribute is no longer fully