I currently try to create classes for a paint-like WPF application. I have to base classes LineMovement (line from StartPoint to EndPoint) and PathMovement (line going through all points specified in a property Points of type PointCollection). These classes inherit from Control and get their looks through a ControlTemplate.
The ControlTemplate also adds an Adorner to the AdornerLayer of the Movement objects containing a little visual marker for every moveable point of the specific line. These markers support dragging with a mouse.
The problem I have is that somehow my Movement classes don’t repaint when their points are moved. I debugged my code with Mole and found out that the Polyline used to visualize the line gets the changed point values (visible in its Points property) but it just doesn’t repaint.
How can I force a repaint of a WPF control?
TemplateBinding doesn’t support two-way data binding (i.e. updating the Points collection with the new values of the Polyline). It’s meant only for one-way data binding for use in control templates. See Bea Stollnitz’s blog entry: http://bea.stollnitz.com/blog/?p=38