Quick: Support reparenting

To support reparenting, we make the compositing surface independent of
the window by using gfx::TEXTURE_TRANSPORT. We also need to be able to
keep frame data across window changes so we can reconstruct the QSGNode
tree in a new context, so extract that data into DelegatedFrameNodeData
class. Any context-specific data is still stored in DelegatedFrameNode.

Also hook up window changes to WebContents::WasShown/Hidden for Quick.
Remove checking of Qt isVisible state, this mechanism is used to sync
Chromium with Qt, not the other way around. WasShown/Hidden is
orthogonal to Show/Hide, and can use different triggers. However for
Widgets it probably makes sense to hook both up to widget visibility.

Change-Id: I1ef4b50cd61b8e54b791e03f0b41929c42fec8bf
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/src/webengine/api/qquickwebengineview.cpp b/src/webengine/api/qquickwebengineview.cpp
index 792102631..049e353b6 100644
--- a/src/webengine/api/qquickwebengineview.cpp
+++ b/src/webengine/api/qquickwebengineview.cpp
@@ -453,6 +453,18 @@ void QQuickWebEngineView::geometryChanged(const QRectF &newGeometry, const QRect
     }
 }
 
+void QQuickWebEngineView::itemChange(ItemChange change, const ItemChangeData &value)
+{
+    Q_D(QQuickWebEngineView);
+    if (change == ItemSceneChange || change == ItemVisibleHasChanged) {
+        if (window() && isVisible())
+            d->adapter->wasShown();
+        else
+            d->adapter->wasHidden();
+    }
+    QQuickItem::itemChange(change, value);
+}
+
 QQuickWebEngineViewHandle::QQuickWebEngineViewHandle()
 {
 }
diff --git a/src/webengine/api/qquickwebengineview_p.h b/src/webengine/api/qquickwebengineview_p.h
index 6b7b44e63..abc46d55f 100644
--- a/src/webengine/api/qquickwebengineview_p.h
+++ b/src/webengine/api/qquickwebengineview_p.h
@@ -111,6 +111,7 @@ Q_SIGNALS:
 
 protected:
     void geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry);
+    void itemChange(ItemChange, const ItemChangeData &);
 
 private:
     Q_DECLARE_PRIVATE(QQuickWebEngineView)