Drawer: reparent to the overlay by default

Drawer is a special type of popup that always resides at one of the
window edges. Therefore it makes sense for drawers to operate on window
coordinates. Re-parenting drawers to the window overlay achieves that.

Now that the window overlay is guaranteed to always exist and the
ApplicationWindow.overlay attached property works even with plain QML
Window, we can reliably use it as a parent for Drawer.

Task-number: QTBUG-53168
Change-Id: I37c727001350217ea1d2d9c52d73b4cae44d7c8d
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/quicktemplates2/qquickdrawer.cpp b/src/quicktemplates2/qquickdrawer.cpp
index 0f5e5824..4c850473 100644
--- a/src/quicktemplates2/qquickdrawer.cpp
+++ b/src/quicktemplates2/qquickdrawer.cpp
@@ -69,6 +69,28 @@ QT_BEGIN_NAMESPACE
             of the window.
     \endtable
 
+    \code
+    import QtQuick 2.7
+    import QtQuick.Controls 2.0
+
+    ApplicationWindow {
+        id: window
+        visible: true
+
+        Drawer {
+            id: drawer
+            width: 0.66 * window.width
+            height: window.height
+        }
+    }
+    \endcode
+
+    Drawer is a special type of popup that resides at one of the window \l {edge}{edges}.
+    By default, Drawer re-parents itself to the window \l {ApplicationWindow::}{overlay},
+    and therefore operates on window coordinates. It is also possible to manually set the
+    \l {Popup::}{parent} to something else to make the drawer operate in a specific
+    coordinate space.
+
     In the image above, the application's contents are \e "pushed" across the
     screen. This is achieved by applying a translation to the contents: