Add LayoutMirroring attached property for mirroring QML layouts

Task-number: QTBUG-17280
Reviewed-by: Martin Jones
Change-Id: I34a623b49ce0fd5c05ae7a7ea5d0437c107b8a9b

1 files changed, 29 insertions, 1 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativepositioners_p_p.h b/src/declarative/graphicsitems/qdeclarativepositioners_p_p.h
index df105c6..e80129d 100644
--- a/src/declarative/graphicsitems/qdeclarativepositioners_p_p.h
+++ b/src/declarative/graphicsitems/qdeclarativepositioners_p_p.h
@@ -75,7 +75,7 @@ public:
     QDeclarativeBasePositionerPrivate()
         : spacing(0), type(QDeclarativeBasePositioner::None)
         , moveTransition(0), addTransition(0), queuedPositioning(false)
-        , doingPositioning(false), anchorConflict(false)
+        , doingPositioning(false), anchorConflict(false), layoutDirection(Qt::LeftToRight)
     {
     }
 
@@ -100,6 +100,9 @@ public:
     bool doingPositioning : 1;
     bool anchorConflict : 1;
 
+    Qt::LayoutDirection layoutDirection;
+
+
     void schedulePositioning()
     {
         Q_Q(QDeclarativeBasePositioner);
@@ -109,6 +112,18 @@ public:
         }
     }
 
+    void mirrorChange() {
+        Q_Q(QDeclarativeBasePositioner);
+        if (type != QDeclarativeBasePositioner::Vertical)
+            q->prePositioning();
+    }
+    bool isLeftToRight() const {
+        if (type == QDeclarativeBasePositioner::Vertical)
+            return true;
+        else
+            return effectiveLayoutMirror ? layoutDirection == Qt::RightToLeft : layoutDirection == Qt::LeftToRight;
+    }
+
     virtual void itemSiblingOrderChanged(QDeclarativeItem* other)
     {
         Q_UNUSED(other);
@@ -139,6 +154,19 @@ public:
         Q_Q(QDeclarativeBasePositioner);
         q->positionedItems.removeOne(QDeclarativeBasePositioner::PositionedItem(item));
     }
+
+    static Qt::LayoutDirection getLayoutDirection(const QDeclarativeBasePositioner *positioner)
+    {
+        return positioner->d_func()->layoutDirection;
+    }
+
+    static Qt::LayoutDirection getEffectiveLayoutDirection(const QDeclarativeBasePositioner *positioner)
+    {
+        if (positioner->d_func()->effectiveLayoutMirror)
+            return positioner->d_func()->layoutDirection == Qt::RightToLeft ? Qt::LeftToRight : Qt::RightToLeft;
+        else
+            return positioner->d_func()->layoutDirection;
+    }
 };
 
 QT_END_NAMESPACE