Make "on" syntax mandatory for value sources and interceptors

Where you would have written

   x: NumberAnimation {}
   y: Behavior {}

you now must write

   NumberAnimation on x {}
   Behavior on y {}

This change also makes the parser more strict with respect to multiple
assignments to a single property - they're no longer allowed.  For example
this

   x: 10
   x: 11

is now an error.

3 files changed, 5 insertions, 5 deletions

diff --git a/demos/declarative/samegame/content/BoomBlock.qml b/demos/declarative/samegame/content/BoomBlock.qml
index 723e62a..e48194a 100644
--- a/demos/declarative/samegame/content/BoomBlock.qml
+++ b/demos/declarative/samegame/content/BoomBlock.qml
@@ -7,8 +7,8 @@ Item { id:block
     property int targetX: 0
     property int targetY: 0
 
-    x: SpringFollow { enabled: spawned; source: targetX; spring: 2; damping: 0.2 }
-    y: SpringFollow { source: targetY; spring: 2; damping: 0.2 }
+    SpringFollow on x { enabled: spawned; source: targetX; spring: 2; damping: 0.2 }
+    SpringFollow on y { source: targetY; spring: 2; damping: 0.2 }
 
     Image { id: img
         source: {
@@ -21,7 +21,7 @@ Item { id:block
             }
         }
         opacity: 0
-        opacity: Behavior { NumberAnimation { duration: 200 } }
+        Behavior on opacity { NumberAnimation { duration: 200 } }
         anchors.fill: parent
     }
 
diff --git a/demos/declarative/samegame/content/Dialog.qml b/demos/declarative/samegame/content/Dialog.qml
index 7769328..6d5d6b5 100644
--- a/demos/declarative/samegame/content/Dialog.qml
+++ b/demos/declarative/samegame/content/Dialog.qml
@@ -14,7 +14,7 @@ Rectangle {
     property Item text: myText
     color: "white"; border.width: 1; width: myText.width + 20; height: myText.height + 40;
     opacity: 0
-    opacity: Behavior {
+    Behavior on opacity {
         NumberAnimation { duration: 1000 }
     }
     Text { id: myText; anchors.centerIn: parent; text: "Hello World!" }
diff --git a/demos/declarative/samegame/samegame.qml b/demos/declarative/samegame/samegame.qml
index 50f6293..c81f292 100644
--- a/demos/declarative/samegame/samegame.qml
+++ b/demos/declarative/samegame/samegame.qml
@@ -39,7 +39,7 @@ Rectangle {
     Dialog {
         id: scoreName; anchors.centerIn: parent; z: 22;
         property int initialWidth: 0
-        width: Behavior{NumberAnimation{} enabled: initialWidth!=0}
+        Behavior on width {NumberAnimation{} enabled: initialWidth!=0}
         Text {
             id: spacer
             anchors.left: scoreName.left