利用sirius定义图形样式

定义图形样式（custom style）的三种方法：

1、通过扩展 StyleConfiguration扩展点 2、CustomStyle以及EditPartProvider GMF扩展点 3、GMF提供的扩展点

通过扩展CustomStyle以及EditPartProvider 扩展点来定义custom style

1、EditPart描述了Node的appearance，EditPart是一个GEF类，它reference了它所要展示的东西的Model element和shape。

2、GMF在GEF的基础上添加了一层，然后将GMF它自己的EditPart API暴露在外。这个API的基类型是org.eclipse.gmf.runtime.diagram.ui.editparts当中的IGraphicalEditPart。

3、所有定制样式的Edit Part都必须实现IStyleEditPart接口。从语义上来说，一种定制的Edit part应该是不可选择的，只有当包含它的形状或者连接被选中的时候，它才是可以被选中的。所以，所有的定制的样式（custom style）都必须重载isselectable（）方法并且返回false。也可以继承抽象类AbstractNotSelectableShapeNodeEditPart，这个类已经重载了这个方法。

应用示例

先通过sirius specification editor 给某个Node定义一个CustomStyle

每一个CustomStyle只用一个Id来标识，通过这个Id来引用具体的CustomStyle。

定义一个Custom Style

public class InstanceRoleStyleEditPart extends AbstractNotSelectableShapeNodeEditPart implements IStyleEditPart {

    /**
     * the content pane.
     */
    protected IFigure contentPane;

    /**
     * the primary shape.
     */
    protected ImageFigure primaryShape;

    /**
     * Create a new {@link ChangingImageEditPart}.
     *
     * @param view
     *            the view.
     */
    public InstanceRoleStyleEditPart(View view) {
        super(view);
    }

    public DragTracker getDragTracker(Request request) {
        return getParent().getDragTracker(request);
    }

    protected NodeFigure createNodeFigure() {
        NodeFigure figure = createNodePlate();
        figure.setLayoutManager(new XYLayout());
        IFigure shape = createNodeShape();
        figure.add(shape);
        contentPane = setupContentPane(shape);
        return figure;
    }

    private NodeFigure createNodePlate() {
        DefaultSizeNodeFigure result = new AirStyleDefaultSizeNodeFigure(getMapMode().DPtoLP(40), getMapMode().DPtoLP(40));
        return result;
    }

    /**
     * Create the instance role figure.
     *
     * @return the created figure.
     */
    protected ImageFigure createNodeShape() {
        if (primaryShape == null) {
            primaryShape = new ImageFigure();
        }
        return primaryShape;
    }

    /**
     * Return the instance role figure.
     *
     * @return the instance role figure.
     */
    public ImageFigure getPrimaryShape() {
        return primaryShape;
    }

    /**
     * Default implementation treats passed figure as content pane. Respects
     * layout one may have set for generated figure.
     *
     * @param nodeShape
     *            instance of generated figure class
     * @return the figure
     */
    protected IFigure setupContentPane(IFigure nodeShape) {
        return nodeShape; // use nodeShape itself as contentPane
    }

    public IFigure getContentPane() {
        if (contentPane != null) {
            return contentPane;
        }
        return super.getContentPane();
    }

    protected void refreshVisuals() {
        CustomStyle customStyle = (CustomStyle) this.resolveSemanticElement();
        if (customStyle.eContainer() instanceof DNode) {
            this.getPrimaryShape().setImage(SiriusPlugin.getDefault().getBundledImage(((DNode) customStyle.eContainer()).getName()));
        }
    }

    protected void createDefaultEditPolicies() {
        // empty.
    }
}
           

引用扩展点，定义一个edit part provider

（扩展点的编辑可以在编辑框里面编辑）

<extension point="org.eclipse.gmf.runtime.diagram.ui.editpartProviders">
  <editpartProvider class="com.example.diagseq.provider.DiagSeqEditPartProvider">
    <Priority name="High"/>
  </editpartProvider>
</extension>
           

（EditPartProvider 代码段）

public class DiagSeqEditPartProvider extends AbstractEditPartProvider {
    @Override
    protected Class getNodeEditPartClass(View view) {
        if (view.getElement() instanceof CustomStyle) {
            CustomStyle customStyle = (CustomStyle) view.getElement();
            //通过Id来确定引用哪一个Edit Part Provider
            if (customStyle.getId().equals(DiagSeqConstants.INSTANCE_ROLE_STYLE_ID)) {
                return InstanceRoleStyleEditPart.class;
            }
        }
        return super.getNodeEditPartClass(view);
    }
}