gef connection 改变颜色

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1. installEditPolicy(EditPolicy.SELECTION_FEEDBACK_ROLE, new SelectionEditPolicy()); 

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public class SelectionEditPolicy extends SelectionEditPolicy {  

 

    protected void hideSelection() {  

        BlockEditpart editpart = (BlockEditpart)getHost();  

        setConnectionVisible(editpart.getSourceConnections(),false,null);  

        setConnectionVisible(editpart.getTargetConnections(),false,null);  

    }  

      

    protected void showPrimarySelection() {  

        BlockEditpart editpart = (BlockEditpart)getHost();  

        editpart.refreshConnections();  

        setConnectionVisible(editpart.getSourceConnections(),true,ColorConstants.red);  

        setConnectionVisible(editpart.getTargetConnections(),true,ColorConstants.red);  

    }  

 

    protected void showSelection() {  

        BlockEditpart editpart = (BlockEditpart)getHost();  

        setConnectionVisible(editpart.getSourceConnections(),true,ColorConstants.green);  

        setConnectionVisible(editpart.getTargetConnections(),true,ColorConstants.green);  

    }  

      

    private void setConnectionVisible(List> Connections, boolean b, Color fg) {  

        for(Object o : Connections) {  

            if(o instanceof ConnectionEditPart) {  

                ConnectionEditPart cep = (ConnectionEditPart)o;  

                cep.setVisible(b,fg);  

            }  

        }  

    }  

} 

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