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From de811eca72d17b7ef734afc1d44af00cc5952f22 Mon Sep 17 00:00:00 2001
From: Dmitry Kazakov <dimula73@gmail.com>
Date: Mon, 11 Mar 2019 13:18:06 +0300
Subject: [PATCH] Synthesize Enter/LeaveEvent for accepted QTabletEvent
When the tablet event is accepted, then Qt doesn't synthesize a mouse
event, it means that QApplicationPrivate::sendMouseEvent() will not be
called, and, therefore, enter/leave events will not be dispatched.
The patch looks a bit hackish. Ideally, the synthesize should happen
in QGuiApplicationPrivate::processTabletEvent(), which takes the decision
about synthesizing mouse events. But there is not enough information
on this level: neither qt_last_mouse_receiver nor the receiver widget
are known at this stage.
On Windows and other platforms where there is a parallel stream of
mouse events synthesized by the platform, we shouldn't generate these
events manually.
Change-Id: Ifbad6284483ee282ad129db54606f5d0d9ddd633
---
src/widgets/kernel/qwidgetwindow.cpp | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/src/widgets/kernel/qwidgetwindow.cpp b/src/widgets/kernel/qwidgetwindow.cpp
index fbc71cd0ea1..729a7f701ae 100644
--- a/src/widgets/kernel/qwidgetwindow.cpp
+++ b/src/widgets/kernel/qwidgetwindow.cpp
@@ -1051,6 +1051,18 @@ void QWidgetWindow::handleTabletEvent(QTabletEvent *event)
event->setAccepted(ev.isAccepted());
}
+ /**
+ * Synthesize Enter/Leave events if it is requested by the system and user
+ */
+ if (widget != qt_last_mouse_receiver &&
+ event->isAccepted() &&
+ !QWindowSystemInterfacePrivate::TabletEvent::platformSynthesizesMouse &&
+ qApp->testAttribute(Qt::AA_SynthesizeMouseForUnhandledTabletEvents)) {
+
+ QApplicationPrivate::dispatchEnterLeave(widget, qt_last_mouse_receiver, event->globalPos());
+ qt_last_mouse_receiver = widget;
+ }
+
if (event->type() == QEvent::TabletRelease && event->buttons() == Qt::NoButton)
qt_tablet_target = 0;
}
--
2.16.3
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