Make the windowcontainer example more robust

The QWindow tends to get mouse releases on Windows when
maximizing the window for example. This is likely a problem
in the platform, but the example should be improved too to
be more robust and ignore such unwanted events.

Task-number: QTBUG-42842
Change-Id: Iecf916a2f753ed1b37d644721ee212ca7c728c49
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>

1 files changed, 11 insertions, 7 deletions

diff --git a/examples/widgets/windowcontainer/windowcontainer.cpp b/examples/widgets/windowcontainer/windowcontainer.cpp
index 022b6dafc4..a38a10e6f6 100644
--- a/examples/widgets/windowcontainer/windowcontainer.cpp
+++ b/examples/widgets/windowcontainer/windowcontainer.cpp
@@ -92,10 +92,12 @@ public:
     }
 
     void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE {
-        m_mouseDown = true;
-        m_polygon.clear();
-        m_polygon.append(e->pos());
-        renderLater();
+        if (!m_mouseDown) {
+            m_mouseDown = true;
+            m_polygon.clear();
+            m_polygon.append(e->pos());
+            renderLater();
+        }
     }
 
     void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE {
@@ -106,9 +108,11 @@ public:
     }
 
     void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE {
-        m_mouseDown = false;
-        m_polygon.append(e->pos());
-        renderLater();
+        if (m_mouseDown) {
+            m_mouseDown = false;
+            m_polygon.append(e->pos());
+            renderLater();
+        }
     }
 
     void focusInEvent(QFocusEvent *) Q_DECL_OVERRIDE {