Windows: Delay-initialize pluggable touch devices.

Move touch device initialization code to QWindowsContext and
replace the assert on the touch device in QWindowsMouseHandler
by a call to the initTouch().

Task-number: QTBUG-48849
Change-Id: If8573b8283ef94e7fd015f6edc626e3c8cc0b139
Reviewed-by: Joni Poikelin <joni.poikelin@theqtcompany.com>
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>
Reviewed-by: Andreas Holzammer <andreas.holzammer@kdab.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowscontext.h b/src/plugins/platforms/windows/qwindowscontext.h
index d2a3481b28..641e3ed41f 100644
--- a/src/plugins/platforms/windows/qwindowscontext.h
+++ b/src/plugins/platforms/windows/qwindowscontext.h
@@ -170,6 +170,9 @@ public:
     explicit QWindowsContext();
     ~QWindowsContext();
 
+    bool initTouch();
+    bool initTouch(unsigned integrationOptions); // For calls from QWindowsIntegration::QWindowsIntegration() only.
+
     int defaultDPI() const;
 
     QString registerWindowClass(const QWindow *w);