Add support for xlib backend X Event filters

Change-Id: Id1e7995f98395de748ce47a27365e4bdd564ea49
Reviewed-by: Simon Hausmann <simon.hausmann@nokia.com>

src/plugins/platforms/xlib/qxlibintegration.cpp

@@ -68,7 +68,7 @@ QXlibIntegration::QXlibIntegration()
 
     XInitThreads();
 
-    mPrimaryScreen = new QXlibScreen();
+    mPrimaryScreen = new QXlibScreen(mNativeInterface);
     mScreens.append(mPrimaryScreen);
     screenAdded(mPrimaryScreen);
 }

src/plugins/platforms/xlib/qxlibintegration.h

@@ -54,6 +54,7 @@
 QT_BEGIN_NAMESPACE
 
 class QXlibScreen;
+class QXlibNativeInterface;
 
 class QXlibIntegration : public QPlatformIntegration
 {
@@ -82,7 +83,7 @@ private:
     QList<QPlatformScreen *> mScreens;
     QPlatformFontDatabase *mFontDb;
     QPlatformClipboard *mClipboard;
-    QPlatformNativeInterface *mNativeInterface;
+    QXlibNativeInterface *mNativeInterface;
     QAbstractEventDispatcher *mEventDispatcher;
 };
 

src/plugins/platforms/xlib/qxlibnativeinterface.cpp

@@ -92,6 +92,17 @@ void * QXlibNativeInterface::nativeResourceForWindow(const QByteArray &resourceS
     }
     return result;
 }
+QPlatformNativeInterface::EventFilter QXlibNativeInterface::setEventFilter(const QByteArray &eventType, QPlatformNativeInterface::EventFilter filter)
+{
+    EventFilter oldFilter = m_eventFilters.value(eventType);
+    m_eventFilters.insert(eventType, filter);
+    return oldFilter;
+}
+
+QPlatformNativeInterface::EventFilter QXlibNativeInterface::eventFilterForEventType(const QByteArray& eventType) const
+{
+    return m_eventFilters.value(eventType);
+}
 
 void * QXlibNativeInterface::displayForWindow(QWindow *window)
 {

src/plugins/platforms/xlib/qxlibnativeinterface.h

@@ -60,6 +60,9 @@ public:
 
     void *nativeResourceForWindow(const QByteArray &resourceString, QWindow *window);
 
+    EventFilter setEventFilter(const QByteArray &eventType, EventFilter filter);
+    EventFilter eventFilterForEventType(const QByteArray& eventType) const;
+
     void *displayForWindow(QWindow *window);
     void *eglDisplayForWindow(QWindow *window);
     void *connectionForWindow(QWindow *window);
@@ -68,6 +71,7 @@ public:
     void *eglContextForWindow(QWindow *window);
 
 private:
+    QHash<QByteArray, EventFilter> m_eventFilters;
     static QXlibScreen *qPlatformScreenForWindow(QWindow *window);
 };
 

src/plugins/platforms/xlib/qxlibscreen.cpp

@@ -50,6 +50,7 @@
 #include "qxlibstatic.h"
 #include "qxlibclipboard.h"
 #include "qxlibdisplay.h"
+#include "qxlibnativeinterface.h"
 
 #include <QtCore/QDebug>
 #include <QtCore/QSocketNotifier>
@@ -190,8 +191,9 @@ qDebug() << "qt_x_errhandler" << err->error_code;
     return 0;
 }
 
-QXlibScreen::QXlibScreen()
+QXlibScreen::QXlibScreen(QXlibNativeInterface *nativeInterface)
-        : mFormat(QImage::Format_RGB32)
+        : mNativeInterface(nativeInterface)
+        , mFormat(QImage::Format_RGB32)
 #if !defined(QT_NO_OPENGL) && defined(QT_OPENGL_ES_2)
         , mEGLDisplay(0)
 #endif
@@ -263,6 +265,11 @@ unsigned long QXlibScreen::whitePixel()
 
 bool QXlibScreen::handleEvent(XEvent *xe)
 {
+    if (QPlatformNativeInterface::EventFilter filter = mNativeInterface->eventFilterForEventType(QByteArrayLiteral("XEvent"))) {
+        if (filter(xe, 0))
+            return true;
+    }
+
     int quit = false;
     QXlibWindow *platformWindow = QXlibWindow::platformWindowForXWindow(xe->xany.window);
     if (!platformWindow)

src/plugins/platforms/xlib/qxlibscreen.h

@@ -55,7 +55,7 @@ class QXlibScreen : public QObject, public QPlatformScreen
 {
     Q_OBJECT
 public:
-    QXlibScreen();
+    QXlibScreen(QXlibNativeInterface *nativeInterface);
 
     ~QXlibScreen();
 
@@ -93,6 +93,7 @@ public slots:
 private:
 
     void handleSelectionRequest(XEvent *event);
+    QXlibNativeInterface *mNativeInterface;
     QRect mGeometry;
     QSizeF mPhysicalSize;
     int mDepth;