[news.eclipse.modeling.gmf] Re: Custom Layout in Compartment

[Balthasar Weitzel <balthasar@xxxxxx>]

Hi Alex, Sven and Srinath,

thanks a lot for your suggestions. Finally I found a solution using all 
of them:

Instead of using the ShapeCompartmentEditPart I directly used the 
ResizableCompartmentEditPart, copied what I need from 
ShapeCompartmentEditPart and customized it so that it has the right 
LayoutEditPolicy and the right Figures.
Furthermore I let my own layout extend XYLayout.

The complete solution:

public class MyCompartmentEditPart extends ResizableCompartmentEditPart{
...
    public IFigure createFigure() {
        ResizableCompartmentFigure rcf;
        if (getParent() == getTopGraphicEditPart()){
            rcf = (ResizableCompartmentFigure) super.createFigure();
        } else {
            rcf = new NestedResizableCompartmentFigure(getMapMode());
        }
        rcf.getContentPane().setLayoutManager(new MyLayoutManager());
            return rcf;
    }
...
    protected void createDefaultEditPolicies() {
        super.createDefaultEditPolicies();
        installEditPolicy(EditPolicy.LAYOUT_ROLE,
            new MyLayoutEditPolicy());
    }
}


My custom layout is a bit large, it arranges the children in a grid. For 
anyone who wants to do a custom layout in a compartment, too:
Take the XYLayout as a basis and look how calculatePreferredSize(..) and 
layout(..) is done there. At first I made the mistake that I did not use 
the constraints that the layout stores and directly called 
child.getPreferredSize(..). This returns much too big values, because an 
other layout manager of the child then tries to use the complete space.

Again, thank you all for your help, finally I got it working :-)

Cheers,
Balthasar