Add a ThemeChange event.

- Pass it from QWindowSystemInterface via QWindow to the widgets.
- Add handler code from 4.8 / qapplication_win.cpp to qwidget.cpp.

Change-Id: Ic759563aa00cb93fe014c1bf41020446c1927dec
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

5 files changed, 29 insertions, 0 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 5ca6364fbb..4d80aafea5 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -661,6 +661,10 @@ void QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePriv
         QGuiApplicationPrivate::reportLogicalDotsPerInchChange(
                 static_cast<QWindowSystemInterfacePrivate::ScreenLogicalDotsPerInchEvent *>(e));
         break;
+    case QWindowSystemInterfacePrivate::ThemeChange:
+        QGuiApplicationPrivate::processThemeChanged(
+                    static_cast<QWindowSystemInterfacePrivate::ThemeChangeEvent *>(e));
+        break;
     case QWindowSystemInterfacePrivate::Map:
         QGuiApplicationPrivate::processMapEvent(static_cast<QWindowSystemInterfacePrivate::MapEvent *>(e));
         break;
@@ -888,6 +892,14 @@ void QGuiApplicationPrivate::processWindowStateChangedEvent(QWindowSystemInterfa
     }
 }
 
+void QGuiApplicationPrivate::processThemeChanged(QWindowSystemInterfacePrivate::ThemeChangeEvent *tce)
+{
+    if (QWindow *window  = tce->window.data()) {
+        QEvent e(QEvent::ThemeChange);
+        QGuiApplication::sendSpontaneousEvent(window, &e);
+    }
+}
+
 void QGuiApplicationPrivate::processGeometryChangeEvent(QWindowSystemInterfacePrivate::GeometryChangeEvent *e)
 {
     if (e->tlw.isNull())
diff --git a/src/gui/kernel/qguiapplication_p.h b/src/gui/kernel/qguiapplication_p.h
index 5f2e92c504..7fafe0336d 100644
--- a/src/gui/kernel/qguiapplication_p.h
+++ b/src/gui/kernel/qguiapplication_p.h
@@ -125,6 +125,7 @@ public:
     static void reportGeometryChange(QWindowSystemInterfacePrivate::ScreenGeometryEvent *e);
     static void reportAvailableGeometryChange(QWindowSystemInterfacePrivate::ScreenAvailableGeometryEvent *e);
     static void reportLogicalDotsPerInchChange(QWindowSystemInterfacePrivate::ScreenLogicalDotsPerInchEvent *e);
+    static void processThemeChanged(QWindowSystemInterfacePrivate::ThemeChangeEvent *tce);
 
     static void processMapEvent(QWindowSystemInterfacePrivate::MapEvent *e);
     static void processUnmapEvent(QWindowSystemInterfacePrivate::UnmapEvent *e);
diff --git a/src/gui/kernel/qwindowsysteminterface_qpa.cpp b/src/gui/kernel/qwindowsysteminterface_qpa.cpp
index f4f7551c04..e6c4454104 100644
--- a/src/gui/kernel/qwindowsysteminterface_qpa.cpp
+++ b/src/gui/kernel/qwindowsysteminterface_qpa.cpp
@@ -340,6 +340,12 @@ void QWindowSystemInterface::handleScreenLogicalDotsPerInchChange(QScreen *scree
     QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
 }
 
+void QWindowSystemInterface::handleThemeChange(QWindow *tlw)
+{
+    QWindowSystemInterfacePrivate::ThemeChangeEvent *e = new QWindowSystemInterfacePrivate::ThemeChangeEvent(tlw);
+    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
+}
+
 void QWindowSystemInterface::handleMapEvent(QWindow *tlw)
 {
     QWindowSystemInterfacePrivate::MapEvent *e = new QWindowSystemInterfacePrivate::MapEvent(tlw);
diff --git a/src/gui/kernel/qwindowsysteminterface_qpa.h b/src/gui/kernel/qwindowsysteminterface_qpa.h
index 28ec68ec59..78152a1178 100644
--- a/src/gui/kernel/qwindowsysteminterface_qpa.h
+++ b/src/gui/kernel/qwindowsysteminterface_qpa.h
@@ -130,6 +130,8 @@ public:
     static void handleScreenAvailableGeometryChange(QScreen *screen, const QRect &newAvailableGeometry);
     static void handleScreenLogicalDotsPerInchChange(QScreen *screen, qreal newDpiX, qreal newDpiY);
 
+    static void handleThemeChange(QWindow *tlw);
+
     // For event dispatcher implementations
     static bool sendWindowSystemEvents(QAbstractEventDispatcher *eventDispatcher, QEventLoop::ProcessEventsFlags flags);
     static int windowSystemEventsQueued();
diff --git a/src/gui/kernel/qwindowsysteminterface_qpa_p.h b/src/gui/kernel/qwindowsysteminterface_qpa_p.h
index 0bd9ba017a..661b39da88 100644
--- a/src/gui/kernel/qwindowsysteminterface_qpa_p.h
+++ b/src/gui/kernel/qwindowsysteminterface_qpa_p.h
@@ -64,6 +64,7 @@ public:
         ScreenGeometry,
         ScreenAvailableGeometry,
         ScreenLogicalDotsPerInch,
+        ThemeChange,
         Map,
         Unmap,
         Expose
@@ -230,6 +231,13 @@ public:
         qreal dpiY;
     };
 
+    class ThemeChangeEvent : public WindowSystemEvent {
+    public:
+        explicit ThemeChangeEvent(QWindow * w)
+            : WindowSystemEvent(ThemeChange), window(w) { }
+        QWeakPointer<QWindow> window;
+    };
+
     class MapEvent : public WindowSystemEvent {
     public:
         MapEvent(QWindow *mapped)