/// <summary>
/// This basically just sets the value of <see cref="Northwoods.GoXam.Node.Position"/>,
/// but with animated movement.
/// </summary>
/// <param name="node"></param>
/// <param name="newpos">a new position in model coordinates</param>
/// <remarks>
/// There is no animation if <see cref="Animated"/> is false,
/// if the <see cref="AnimationTime"/> is very small, or
/// if the original position and the new position are very near to each other
/// or offscreen.
/// </remarks>
public void MoveAnimated(Node node, Point newpos)
{
if (node == null)
{
return;
}
VerifyAccess();
Point oldloc = node.Location;
Rect oldb = node.Bounds;
//Diagram.Debug("LayoutManager.MoveAnimated: " + Diagram.Str(node) + " " + Diagram.Str(node.Position) + " -- > " + Diagram.Str(newpos));
// always move the node
node.Position = newpos;
if (this.Story != null)
{
// if MoveAnimated is called more than once for a Node, remove any previous saved animation
PointAnimation anim = null;
if (this.Animations.TryGetValue(node, out anim))
{
//Diagram.Debug(" removed animation for " + node.ToString());
this.Story.Children.Remove(anim);
}
}
// try not to bother with animations that won't be visibly useful
if (!this.Animated)
{
return;
}
if (this.AnimationTime <= 10)
{
return;
}
// two pixels or more (but that's in model coordinates)
if (Math.Abs(newpos.X - oldb.X) < 2 && Math.Abs(newpos.Y - oldb.Y) < 2)
{
return;
}
FrameworkElement elt = node.VisualElement;
if (elt == null)
{
return;
}
// only do animation for nodes whose new or old bounds are visible in the view
//?? this doesn't work reliably:
Diagram diagram = this.Diagram;
if (diagram == null || diagram.Panel == null)
{
return;
}
Rect nearRect = diagram.Panel.InflatedViewportBounds;
Rect newb = new Rect(newpos.X, newpos.Y, oldb.Width, oldb.Height);
if (!Geo.Intersects(nearRect, oldb) && !Geo.Intersects(nearRect, newb))
{
return;
}
// start an animation
//Diagram.Debug(" MoveAnimated " + Diagram.Str(new Point(oldb.X, oldb.Y)) + Diagram.Str(node.Position));
if (Double.IsNaN(oldloc.X))
{
oldloc.X = this.DefaultLocation.X;
}
if (Double.IsNaN(oldloc.Y))
{
oldloc.Y = this.DefaultLocation.Y;
}
PointAnimation a = new PointAnimation();
a.From = oldloc;
a.Duration = this.AnimationDuration;
Storyboard.SetTarget(a, elt);
Storyboard.SetTargetProperty(a, new PropertyPath(Node.LocationProperty));
Storyboard story = this.Story;
if (story == null) // when called from outside of DoLayoutDiagram
{
Storyboard singlestory = new Storyboard();
singlestory.Children.Add(a);
StartStoryboard(singlestory);
}
else
{
StartingLayoutAnimation();
story.Children.Add(a); // collect animations for later action, all at once
this.Animations[node] = a;
}
}