From 60ed6a433a1d51d5ca7ccdeff3fce55e2350d20c Mon Sep 17 00:00:00 2001 From: Shawn Rutledge Date: Thu, 7 Aug 2014 13:57:50 +0200 Subject: Add Window attached property on Item An Item sometimes needs to know a few things about the window in which it is being displayed; this attached property can expose them without needing to go up the heirarchy to find the window. Instead of adding the QQuickWindow pointer as a property on Item as in 8f49f50a169db85401eb37daf4fe3a0fc3280603, having an attached property means that it will not be found by introspection; and it solves the problem that Window is in the QtQuick.Window module: you must import the module to use the attached property, instead of having access to a pointer whose type might not be defined if you didn't import it. The Window attached property is created on-demand (so the memory cost adds up if you use it in too many places); the tradeoff is that it can exist even when the item is not yet being shown in a window, so bindings at startup work. The API is purposely incomplete compared to that in QQuickWindow so that we can introduce what is needed in a controlled fasion over time. For now we know of use cases for visibility, active and activeFocusItem. [ChangeLog][QtQuick][Window] Added Item.Window attached property Change-Id: I649404cbd1383326678aa2144f790b2f2542dbbc Reviewed-by: J-P Nurmi --- src/quick/items/qquickwindow.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'src/quick/items/qquickwindow.h') diff --git a/src/quick/items/qquickwindow.h b/src/quick/items/qquickwindow.h index 6353f6a30c..04a89b1d3d 100644 --- a/src/quick/items/qquickwindow.h +++ b/src/quick/items/qquickwindow.h @@ -47,6 +47,7 @@ #include #include #include +#include QT_BEGIN_NAMESPACE @@ -55,6 +56,7 @@ class QQuickItem; class QSGTexture; class QInputMethodEvent; class QQuickWindowPrivate; +class QQuickWindowAttached; class QOpenGLFramebufferObject; class QQmlIncubationController; class QInputMethodEvent; @@ -156,6 +158,8 @@ public: void scheduleRenderJob(QRunnable *job, RenderStage schedule); + static QQuickWindowAttached *qmlAttachedProperties(QObject *object); + Q_SIGNALS: void frameSwapped(); Q_REVISION(2) void openglContextCreated(QOpenGLContext *context); @@ -220,6 +224,7 @@ private: QT_END_NAMESPACE Q_DECLARE_METATYPE(QQuickWindow *) +QML_DECLARE_TYPEINFO(QQuickWindow, QML_HAS_ATTACHED_PROPERTIES) #endif // QQUICKWINDOW_H -- cgit v1.2.3