path: root/src/gui/kernel/qwindowsysteminterface.cpp
diff options
Diffstat (limited to 'src/gui/kernel/qwindowsysteminterface.cpp')
1 files changed, 17 insertions, 0 deletions
diff --git a/src/gui/kernel/qwindowsysteminterface.cpp b/src/gui/kernel/qwindowsysteminterface.cpp
index 233c27dee7..e2087bd22f 100644
--- a/src/gui/kernel/qwindowsysteminterface.cpp
+++ b/src/gui/kernel/qwindowsysteminterface.cpp
@@ -303,6 +303,23 @@ QWindowSystemInterfacePrivate::ExposeEvent::ExposeEvent(QWindow *window, const Q
+/*! \internal
+ Handles an expose event.
+ The platform plugin sends expose events when an area of the window
+ is invalidated or window exposure changes. \a region is in window
+ local coordinates. An empty region indicates that the window is
+ obscured, but note that the exposed property of the QWindow will be set
+ based on what QPlatformWindow::isExposed() returns at the time of this call,
+ not based on what the region is. // FIXME: this should probably be fixed.
+ The platform plugin may omit sending expose events (or send obscure
+ events) for windows that are on screen but where the client area is
+ completely covered by other windows or otherwise not visible. Expose
+ event consumers can then use this to disable updates for such windows.
+ This is required behavior on platforms where OpenGL swapbuffers stops
+ blocking for obscured windows (like macOS).
QT_DEFINE_QPA_EVENT_HANDLER(void, handleExposeEvent, QWindow *window, const QRegion &region)
QWindowSystemInterfacePrivate::ExposeEvent *e =