Added setSwitchPolicy to MeeGo graphicssystem helper API.

This lets the application control whether or not automatic switching
should be used, and also to completely disable switching if desired.

Reviewed-by: Armin Berres

6 files changed, 58 insertions, 7 deletions

diff --git a/src/plugins/graphicssystems/meego/qmeegographicssystem.cpp b/src/plugins/graphicssystems/meego/qmeegographicssystem.cpp
index cb66695..c904c3c 100644
--- a/src/plugins/graphicssystems/meego/qmeegographicssystem.cpp
+++ b/src/plugins/graphicssystems/meego/qmeegographicssystem.cpp
@@ -67,6 +67,8 @@ QHash <Qt::HANDLE, QPixmap*> QMeeGoGraphicsSystem::liveTexturePixmaps;
 
 QList<QMeeGoSwitchCallback> QMeeGoGraphicsSystem::switchCallbacks;
 
+QMeeGoGraphicsSystem::SwitchPolicy QMeeGoGraphicsSystem::switchPolicy = QMeeGoGraphicsSystem::AutomaticSwitch;
+
 QMeeGoGraphicsSystem::QMeeGoGraphicsSystem()
 {
     qDebug("Using the meego graphics system");
@@ -122,14 +124,14 @@ void QMeeGoGraphicsSystemSwitchHandler::addWidget(QWidget *widget)
 
 void QMeeGoGraphicsSystemSwitchHandler::handleMapNotify()
 {
-    if (m_widgets.isEmpty())
+    if (m_widgets.isEmpty() && QMeeGoGraphicsSystem::switchPolicy == QMeeGoGraphicsSystem::AutomaticSwitch)
         QTimer::singleShot(0, this, SLOT(switchToMeeGo()));
 }
 
 void QMeeGoGraphicsSystemSwitchHandler::removeWidget(QObject *object)
 {
     m_widgets.removeOne(static_cast<QWidget *>(object));
-    if (m_widgets.isEmpty())
+    if (m_widgets.isEmpty() && QMeeGoGraphicsSystem::switchPolicy == QMeeGoGraphicsSystem::AutomaticSwitch)
         QTimer::singleShot(0, this, SLOT(switchToRaster()));
 }
 
@@ -153,7 +155,9 @@ int QMeeGoGraphicsSystemSwitchHandler::visibleWidgets() const
 
 bool QMeeGoGraphicsSystemSwitchHandler::eventFilter(QObject *object, QEvent *event)
 {
-    if (event->type() == QEvent::WindowStateChange) {
+    if (event->type() == QEvent::WindowStateChange
+        && QMeeGoGraphicsSystem::switchPolicy == QMeeGoGraphicsSystem::AutomaticSwitch)
+    {
         QWindowStateChangeEvent *change = static_cast<QWindowStateChangeEvent *>(event);
         QWidget *widget = static_cast<QWidget *>(object);
 
@@ -380,7 +384,7 @@ QString QMeeGoGraphicsSystem::runningGraphicsSystemName()
 
 void QMeeGoGraphicsSystem::switchToMeeGo()
 {
-    if (meeGoRunning())
+    if (switchPolicy == NoSwitch || meeGoRunning())
         return;
 
     if (QApplicationPrivate::instance()->graphics_system_name != QLatin1String("runtime"))
@@ -397,7 +401,7 @@ void QMeeGoGraphicsSystem::switchToMeeGo()
 
 void QMeeGoGraphicsSystem::switchToRaster()
 {
-    if (runningGraphicsSystemName() == QLatin1String("raster"))
+    if (switchPolicy == NoSwitch || runningGraphicsSystemName() == QLatin1String("raster"))
         return;
 
     if (QApplicationPrivate::instance()->graphics_system_name != QLatin1String("runtime"))
@@ -522,4 +526,9 @@ void qt_meego_register_switch_callback(QMeeGoSwitchCallback callback)
     QMeeGoGraphicsSystem::registerSwitchCallback(callback);
 }
 
+void qt_meego_set_switch_policy(int policy)
+{
+    QMeeGoGraphicsSystem::switchPolicy = QMeeGoGraphicsSystem::SwitchPolicy(policy);
+}
+
 #include "qmeegographicssystem.moc"
diff --git a/src/plugins/graphicssystems/meego/qmeegographicssystem.h b/src/plugins/graphicssystems/meego/qmeegographicssystem.h
index ecc85b2..3528425 100644
--- a/src/plugins/graphicssystems/meego/qmeegographicssystem.h
+++ b/src/plugins/graphicssystems/meego/qmeegographicssystem.h
@@ -52,6 +52,8 @@ extern "C" typedef void (*QMeeGoSwitchCallback)(int type, const char *name);
 class QMeeGoGraphicsSystem : public QGraphicsSystem
 {
 public:
+    enum SwitchPolicy { AutomaticSwitch, ManualSwitch, NoSwitch };
+
     QMeeGoGraphicsSystem();
     ~QMeeGoGraphicsSystem();
 
@@ -84,6 +86,8 @@ public:
 
     static void registerSwitchCallback(QMeeGoSwitchCallback callback);
 
+    static SwitchPolicy switchPolicy;
+
 private:
     static bool meeGoRunning();
     static EGLSurface getSurfaceForLiveTexturePixmap(QPixmap *pixmap);
@@ -93,7 +97,6 @@ private:
     static bool surfaceWasCreated;
     static QHash<Qt::HANDLE, QPixmap*> liveTexturePixmaps;
     static QList<QMeeGoSwitchCallback> switchCallbacks;
-
 };
 
 /* C api */
@@ -118,6 +121,7 @@ extern "C" {
     Q_DECL_EXPORT void qt_meego_switch_to_raster(void);
     Q_DECL_EXPORT void qt_meego_switch_to_meego(void);
     Q_DECL_EXPORT void qt_meego_register_switch_callback(QMeeGoSwitchCallback callback);
+    Q_DECL_EXPORT void qt_meego_set_switch_policy(int policy);
 }
 
 #endif 
diff --git a/tools/qmeegographicssystemhelper/qmeegographicssystemhelper.cpp b/tools/qmeegographicssystemhelper/qmeegographicssystemhelper.cpp
index 3f39bda..6778bd5 100644
--- a/tools/qmeegographicssystemhelper/qmeegographicssystemhelper.cpp
+++ b/tools/qmeegographicssystemhelper/qmeegographicssystemhelper.cpp
@@ -136,6 +136,11 @@ void QMeeGoGraphicsSystemHelper::setSwapBehavior(SwapMode mode)
         QGLWindowSurface::swapBehavior = QGLWindowSurface::KillSwap;
 }
 
+void QMeeGoGraphicsSystemHelper::setSwitchPolicy(SwitchPolicy policy)
+{
+    QMeeGoRuntime::setSwitchPolicy(policy);
+}
+
 void QMeeGoGraphicsSystemHelper::enableSwitchEvents()
 {
     QMeeGoRuntime::enableSwitchEvents();
diff --git a/tools/qmeegographicssystemhelper/qmeegographicssystemhelper.h b/tools/qmeegographicssystemhelper/qmeegographicssystemhelper.h
index 9e50652..4612190 100644
--- a/tools/qmeegographicssystemhelper/qmeegographicssystemhelper.h
+++ b/tools/qmeegographicssystemhelper/qmeegographicssystemhelper.h
@@ -112,6 +112,7 @@ public:
      If switch events are enabled, two events will be emitted for each switch --
      one before the switch (QMeeGoSwitchEvent::WillSwitch) and one after the
      switch (QMeeGoSwitchEvent::DidSwitch).
+     If the switch policy is set to NoSwitch, this function has no effect.
     */
     static void switchToMeeGo();
 
@@ -124,9 +125,27 @@ public:
      Calling this function will emit QMeeGoSwitchEvent to the top level widgets. If switch
      events are enabled, two events will be emitted for each switch -- one before the
      switch (QMeeGoSwitchEvent::WillSwitch) and one after the switch (QMeeGoSwitchEvent::DidSwitch).
+     If the switch policy is set to NoSwitch, this function has no effect.
     */
     static void switchToRaster();
 
+    //! Used to specify the policy for graphics system switching.
+    enum SwitchPolicy {
+        AutomaticSwitch,    /**< Automatic switching */
+        ManualSwitch,       /**< Switching is controleld by the application */
+        NoSwitch            /**< Switching is disabled completely */
+    };
+
+    //! Sets the policy of graphicssystem switching
+    /*!
+     By default, the switch to raster happens automatically when all windows are either
+     minimized or when the last window is destroyed. This function lets the application
+     change the graphicssystem switching policy to prevent the switching from happening
+     automatically (that is if the application doesn't want switching at all or wishes
+     to control the switching manually).
+    */
+    static void setSwitchPolicy(SwitchPolicy policy);
+
     //! Returns the name of the active graphics system
     /*!
      Returns the name of the currently active system. If running with 'runtime' graphics 
diff --git a/tools/qmeegographicssystemhelper/qmeegoruntime.cpp b/tools/qmeegographicssystemhelper/qmeegoruntime.cpp
index 15f9cdf..928d01a 100644
--- a/tools/qmeegographicssystemhelper/qmeegoruntime.cpp
+++ b/tools/qmeegographicssystemhelper/qmeegoruntime.cpp
@@ -75,6 +75,7 @@ typedef void (*QMeeGoInvalidateLiveSurfacesFunc) (void);
 typedef void (*QMeeGoSwitchToRasterFunc) (void);
 typedef void (*QMeeGoSwitchToMeeGoFunc) (void);
 typedef void (*QMeeGoRegisterSwitchCallbackFunc) (void (*callback)(int type, const char *name));
+typedef void (*QMeeGoSetSwitchPolicyFunc) (int policy);
 
 static QMeeGoImageToEglSharedImageFunc qt_meego_image_to_egl_shared_image = NULL;
 static QMeeGoPixmapDataFromEglSharedImageFunc qt_meego_pixmapdata_from_egl_shared_image = NULL;
@@ -95,6 +96,7 @@ static QMeeGoInvalidateLiveSurfacesFunc qt_meego_invalidate_live_surfaces = NULL
 static QMeeGoSwitchToRasterFunc qt_meego_switch_to_raster = NULL;
 static QMeeGoSwitchToMeeGoFunc qt_meego_switch_to_meego = NULL;
 static QMeeGoRegisterSwitchCallbackFunc qt_meego_register_switch_callback = NULL;
+static QMeeGoSetSwitchPolicyFunc qt_meego_set_switch_policy = NULL;
 
 extern "C" void handleSwitch(int type, const char *name)
 {
@@ -134,6 +136,7 @@ void QMeeGoRuntime::initialize()
         qt_meego_switch_to_raster = (QMeeGoSwitchToRasterFunc) library.resolve("qt_meego_switch_to_raster");
         qt_meego_switch_to_meego = (QMeeGoSwitchToMeeGoFunc) library.resolve("qt_meego_switch_to_meego");
         qt_meego_register_switch_callback = (QMeeGoRegisterSwitchCallbackFunc) library.resolve("qt_meego_register_switch_callback");
+        qt_meego_set_switch_policy = (QMeeGoSetSwitchPolicyFunc) library.resolve("qt_meego_set_switch_policy");
 
         if (qt_meego_image_to_egl_shared_image && qt_meego_pixmapdata_from_egl_shared_image && 
             qt_meego_pixmapdata_with_gl_texture && qt_meego_destroy_egl_shared_image && qt_meego_update_egl_shared_image_pixmap && 
@@ -141,7 +144,8 @@ void QMeeGoRuntime::initialize()
             qt_meego_pixmapdata_with_new_live_texture && qt_meego_pixmapdata_from_live_texture_handle &&
             qt_meego_live_texture_lock && qt_meego_live_texture_release && qt_meego_live_texture_get_handle &&
             qt_meego_create_fence_sync && qt_meego_destroy_fence_sync && qt_meego_invalidate_live_surfaces &&
-            qt_meego_switch_to_raster && qt_meego_switch_to_meego && qt_meego_register_switch_callback)
+            qt_meego_switch_to_raster && qt_meego_switch_to_meego && qt_meego_register_switch_callback &&
+            qt_meego_set_switch_policy)
         {
             qDebug("Successfully resolved MeeGo graphics system: %s %s\n", qPrintable(libraryPrivate->fileName), qPrintable(libraryPrivate->fullVersion));
         } else {
@@ -289,3 +293,10 @@ void QMeeGoRuntime::enableSwitchEvents()
         switchEventsEnabled = true;
     }
 }
+
+void QMeeGoRuntime::setSwitchPolicy(QMeeGoGraphicsSystemHelper::SwitchPolicy policy)
+{
+    ENSURE_INITIALIZED;
+    Q_ASSERT(qt_meego_set_switch_policy);
+    qt_meego_set_switch_policy(int(policy));
+}
diff --git a/tools/qmeegographicssystemhelper/qmeegoruntime.h b/tools/qmeegographicssystemhelper/qmeegoruntime.h
index 6279b4c..b898699 100644
--- a/tools/qmeegographicssystemhelper/qmeegoruntime.h
+++ b/tools/qmeegographicssystemhelper/qmeegoruntime.h
@@ -42,6 +42,8 @@
 #include <QPixmap>
 #include <QImage>
 
+#include "qmeegographicssystemhelper.h"
+
 class QMeeGoRuntime
 {
 public:
@@ -66,6 +68,7 @@ public:
     static void switchToRaster();
     static void switchToMeeGo();
     static void enableSwitchEvents();
+    static void setSwitchPolicy(QMeeGoGraphicsSystemHelper::SwitchPolicy policy);
 
 private:
     static bool initialized;