Fix for multiple QExposeEvent under Windows.

TReed0803 · Jan 18, 2015 · f243e87 · f243e87
1 parent ccc0bc2
commit f243e87
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diff --git a/2_3DRendering/window.cpp b/2_3DRendering/window.cpp
@@ -2,6 +2,7 @@
 #include <QDebug>
 #include <QString>
 #include <QOpenGLShaderProgram>
+#include <QExposeEvent>
 #include "qvertex.h"
 
 // Front Verticies
@@ -143,6 +144,20 @@ void Window::update()
   QOpenGLWindow::update();
 }
 
+void Window::exposeEvent(QExposeEvent *ev)
+{
+  if (ev->region() != m_cachedRegion)
+  {
+    m_cachedRegion = ev->region();
+    QOpenGLWindow::exposeEvent(ev);
+  }
+  else
+  {
+    ev->ignore();
+  }
+
+}
+
 /*******************************************************************************
  * Private Helpers
  ******************************************************************************/

diff --git a/2_3DRendering/window.h b/2_3DRendering/window.h
@@ -8,6 +8,7 @@
 #include <QMatrix4x4>
 #include "qtransform3d.h"
 
+class QExposeEvent;
 class QOpenGLShaderProgram;
 
 class Window : public QOpenGLWindow,
@@ -25,6 +26,9 @@ protected slots:
   void teardownGL();
   void update();
 
+protected:
+  void exposeEvent(QExposeEvent *ev);
+
 private:
   // OpenGL State Information
   QOpenGLBuffer m_vertex;
@@ -37,6 +41,9 @@ protected slots:
   QMatrix4x4 m_projection;
   QTransform3D m_transform;
 
+  // Fix for Windows
+  QRegion m_cachedRegion;
+
   // Private Helpers
   void printVersionInformation();
 };