Implement X11 event merging in krandrtray

This closes Bug 758

kcontrol/randr/krandrapp.cpp

@@ -28,13 +28,20 @@
 KRandRApp::KRandRApp()
 	: m_tray(new KRandRSystemTray(0L, "RANDRTray"))
 {
+	connect(&m_eventMergingTimer, TQT_SIGNAL(timeout()), this, TQT_SLOT(handleX11ConfigChangeEvent()));
 	m_tray->show();
 }
 
+void KRandRApp::handleX11ConfigChangeEvent()
+{
+	m_eventMergingTimer.stop();
+	m_tray->configChanged();
+}
+
 bool KRandRApp::x11EventFilter(XEvent* e)
 {
 	if (e->type == m_tray->screenChangeNotifyEvent()) {
-		m_tray->configChanged();
+		m_eventMergingTimer.start(1000, TRUE);
 	}
 	return KApplication::x11EventFilter( e );
 }

kcontrol/randr/krandrapp.h

@@ -19,6 +19,7 @@
 #ifndef KRANDRAPP_H
 #define KRANDRAPP_H
 
+#include <tqtimer.h>
 #include <kuniqueapplication.h>
 
 class KRandRSystemTray;
@@ -32,8 +33,12 @@ public:
 
 	virtual bool x11EventFilter(XEvent * e);
 
+private slots:
+	void handleX11ConfigChangeEvent();
+
 private:
 	KRandRSystemTray*	m_tray;
+	TQTimer			m_eventMergingTimer;
 };
 
 #endif