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>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/widgets/kernel/qwidgetwindow_qpa.cpp b/src/widgets/kernel/qwidgetwindow_qpa.cpp
index c2524567f1..c04d8a9dc3 100644
--- a/src/widgets/kernel/qwidgetwindow_qpa.cpp
+++ b/src/widgets/kernel/qwidgetwindow_qpa.cpp
@@ -150,6 +150,12 @@ bool QWidgetWindow::event(QEvent *event)
         handleWindowStateChangedEvent(static_cast<QWindowStateChangeEvent *>(event));
         return true;
 
+    case QEvent::ThemeChange: {
+        QEvent widgetEvent(QEvent::ThemeChange);
+        QGuiApplication::sendSpontaneousEvent(m_widget, &widgetEvent);
+    }
+        return true;
+
     default:
         break;
     }