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author | Shawn Rutledge <shawn.rutledge@digia.com> | 2014-08-07 13:57:50 +0200 |
---|---|---|
committer | J-P Nurmi <jpnurmi@digia.com> | 2014-08-08 19:28:34 +0200 |
commit | 60ed6a433a1d51d5ca7ccdeff3fce55e2350d20c (patch) | |
tree | 494b2eced9e2665aa0fc8e3546d2fc1230fc1663 /src/quick/items/qquickwindowmodule.cpp | |
parent | b4b27168ac03d61f6dfa146c9262df44097eadfe (diff) |
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 <jpnurmi@digia.com>
Diffstat (limited to 'src/quick/items/qquickwindowmodule.cpp')
-rw-r--r-- | src/quick/items/qquickwindowmodule.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/quick/items/qquickwindowmodule.cpp b/src/quick/items/qquickwindowmodule.cpp index 51053ea801..f472d5b867 100644 --- a/src/quick/items/qquickwindowmodule.cpp +++ b/src/quick/items/qquickwindowmodule.cpp @@ -40,6 +40,7 @@ ****************************************************************************/ #include "qquickwindowmodule_p.h" +#include "qquickwindowattached_p.h" #include "qquickscreen_p.h" #include "qquickview_p.h" #include <QtQuick/QQuickWindow> @@ -173,6 +174,10 @@ void QQuickWindowModule::defineModule() { const char uri[] = "QtQuick.Window"; + // Since Window is both an attached property and a createable type, + // the attached property declaration must come first so that it can + // be overridden below. + qmlRegisterUncreatableType<QQuickWindow>(uri, 2, 2, "Window", QQuickWindow::tr("Window is available via attached properties")); qmlRegisterType<QQuickWindow>(uri, 2, 0, "Window"); qmlRegisterRevision<QWindow,1>(uri, 2, 1); qmlRegisterRevision<QWindow,2>(uri, 2, 2); |