Add SmoothedFollow element to qml

The SmoothedFollow is the same as the old EaseFollow, so it's not an
animation, but its main use case is to be used as a property value
source to automatically follow the 'to' property, as in the example below.

Rectangle {
    color: "green"
    width: 60; height: 60;
    SmoothedFollow on x { to: rect1.x - 5; velocity: 200 }
    SmoothedFollow on y { to: rect1.y - 5; velocity: 200 }
}

This element shares the internal implementation with SmoothedAnimation,
both providing the same easing function, but with SmoothedFollow it's
easier to set a start value to animate intially and then start to follow,
while SmoothedAnimation is still convenient for using inside Behaviors
and Transitions.

Reviewed-by: Michael Brasser

1 files changed, 40 insertions, 0 deletions

diff --git a/tests/auto/declarative/qmlvisual/qdeclarativesmoothedanimation/smoothedfollow.qml b/tests/auto/declarative/qmlvisual/qdeclarativesmoothedanimation/smoothedfollow.qml
new file mode 100644
index 0000000..5dee0c6
--- /dev/null
+++ b/tests/auto/declarative/qmlvisual/qdeclarativesmoothedanimation/smoothedfollow.qml
@@ -0,0 +1,40 @@
+import Qt 4.6
+
+Rectangle {
+    width: 800; height: 240; color: "gray"
+
+    Rectangle {
+        id: rect
+        width: 50; height: 20; y: 30; color: "black"
+        SequentialAnimation on x {
+            loops: Animation.Infinite
+            NumberAnimation { from: 50; to: 700; duration: 2000 }
+            NumberAnimation { from: 700; to: 50; duration: 2000 }
+        }
+    }
+
+    Rectangle {
+        width: 50; height: 20; y: 60; color: "red"
+        SmoothedFollow on x { to: rect.x; velocity: 400; enabled: true }
+    }
+
+    Rectangle {
+        width: 50; height: 20; y: 90; color: "yellow"
+        SmoothedFollow on x { to: rect.x; velocity: 300; reversingMode: SmoothedAnimation.Immediate; enabled: true }
+    }
+
+    Rectangle {
+        width: 50; height: 20; y: 120; color: "green"
+        SmoothedFollow on x { to: rect.x; reversingMode: SmoothedAnimation.Sync; enabled: true }
+    }
+
+    Rectangle {
+        width: 50; height: 20; y: 150; color: "purple"
+        SmoothedFollow on x { to: rect.x; maximumEasingTime: 200; enabled: true }
+    }
+
+    Rectangle {
+        width: 50; height: 20; y: 180; color: "blue"
+        SmoothedFollow on x { to: rect.x; duration: 300; enabled: true }
+    }
+}