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authorMorten Engvoldsen <morten.engvoldsen@nokia.com>2009-11-10 21:02:21 (GMT)
committerMorten Engvoldsen <morten.engvoldsen@nokia.com>2009-11-10 21:02:21 (GMT)
commit543cceb53795a1af8a3515a18025998f24ff4ca0 (patch)
tree3807e122a60e19f6f2118e9a902c32ae65224b6a /src/gui/kernel/qevent.cpp
parentbe8746da74abb213d25fa8aa51a296d193bd9be0 (diff)
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Documentation: Adding comments to QHoverEvent class
Explaining the difference between hover events and enter/leave/move events Task-number: QT-1116 Reviewed-by: Bjørn Erik Nilsen
Diffstat (limited to 'src/gui/kernel/qevent.cpp')
-rw-r--r--src/gui/kernel/qevent.cpp34
1 files changed, 34 insertions, 0 deletions
diff --git a/src/gui/kernel/qevent.cpp b/src/gui/kernel/qevent.cpp
index ff97405..c4a25e1 100644
--- a/src/gui/kernel/qevent.cpp
+++ b/src/gui/kernel/qevent.cpp
@@ -399,6 +399,40 @@ QMouseEventEx::~QMouseEventEx()
The function pos() gives the current cursor position, while oldPos() gives
the old mouse position.
+
+ There are a few similarities between the events QEvent::HoverEnter
+ and QEvent::HoverLeave, and the events QEvent::Enter and QEvent::Leave.
+ However, they are slightly different because we do an update() in the event
+ handler of HoverEnter and HoverLeave.
+
+ QEvent::HoverMove is also slightly different from QEvent::MouseMove. Let us
+ consider a top-level window A containing a child B which in turn contains a
+ child C (all with mouse tracking enabled):
+
+ \image hoverEvents.png
+
+ Now, if you move the cursor from the top to the bottom in the middle of A,
+ you will get the following QEvent::MouseMove events:
+
+ \list 1
+ \o A::MouseMove
+ \o B::MouseMove
+ \o C::MouseMove
+ \endlist
+
+ You will get the same events for QEvent::HoverMove, except that the event
+ always propagates to the top-level regardless whether the event is accepted
+ or not. It will only stop propagating with the Qt::WA_NoMousePropagation
+ attribute.
+
+ In this case the events will occur in the following way:
+
+ \list 1
+ \o A::HoverMove
+ \o A::HoverMove, B::HoverMove
+ \o A::HoverMove, B::HoverMove, C::HoverMove
+ \endlist
+
*/
/*!