Add an error signal to QQuickWindow

When nothing is connected to this signal, an error will be printed or,
in case of Windows, a message box will be shown. If there is something
connected, it is up to the application to handle the error.

[ChangeLog] Added a new sceneGraphError() signal to QQuickWindow
which applications can use to detect errors like OpenGL context creation
failures and react in their own custom ways.

Task-number: QTBUG-36138
Change-Id: I33b1e5e0e3f25872af67c5bb5ae937e3470b25f3
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/quick/items/qquickwindow.h b/src/quick/items/qquickwindow.h
index ced232467b..8be6cc88b7 100644
--- a/src/quick/items/qquickwindow.h
+++ b/src/quick/items/qquickwindow.h
@@ -79,6 +79,11 @@ public:
 
     Q_DECLARE_FLAGS(CreateTextureOptions, CreateTextureOption)
 
+    enum SceneGraphError {
+        ContextNotAvailable = 1
+    };
+    Q_ENUMS(SceneGraphError)
+
     QQuickWindow(QWindow *parent = 0);
 
     virtual ~QQuickWindow();
@@ -142,6 +147,7 @@ Q_SIGNALS:
     Q_REVISION(1) void closing(QQuickCloseEvent *close);
     void colorChanged(const QColor &);
     Q_REVISION(1) void activeFocusItemChanged();
+    void sceneGraphError(QQuickWindow::SceneGraphError error, const QString &message);
 
 public Q_SLOTS:
     void update();