利用sirius定義圖形樣式

定義圖形樣式（custom style）的三種方法：

1、通過擴充 StyleConfiguration擴充點 2、CustomStyle以及EditPartProvider GMF擴充點 3、GMF提供的擴充點

通過擴充CustomStyle以及EditPartProvider 擴充點來定義custom style

1、EditPart描述了Node的appearance，EditPart是一個GEF類，它reference了它所要展示的東西的Model element和shape。

2、GMF在GEF的基礎上添加了一層，然後将GMF它自己的EditPart API暴露在外。這個API的基類型是org.eclipse.gmf.runtime.diagram.ui.editparts當中的IGraphicalEditPart。

3、所有定制樣式的Edit Part都必須實作IStyleEditPart接口。從語義上來說，一種定制的Edit part應該是不可選擇的，隻有當包含它的形狀或者連接配接被選中的時候，它才是可以被選中的。是以，所有的定制的樣式（custom style）都必須重載isselectable（）方法并且傳回false。也可以繼承抽象類AbstractNotSelectableShapeNodeEditPart，這個類已經重載了這個方法。

應用示例

先通過sirius specification editor 給某個Node定義一個CustomStyle

每一個CustomStyle隻用一個Id來辨別，通過這個Id來引用具體的CustomStyle。

定義一個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.
    }
}
           

引用擴充點，定義一個edit part provider

（擴充點的編輯可以在編輯框裡面編輯）

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

（EditPartProvider 代碼段）

public class DiagSeqEditPartProvider extends AbstractEditPartProvider {
    @Override
    protected Class getNodeEditPartClass(View view) {
        if (view.getElement() instanceof CustomStyle) {
            CustomStyle customStyle = (CustomStyle) view.getElement();
            //通過Id來确定引用哪一個Edit Part Provider
            if (customStyle.getId().equals(DiagSeqConstants.INSTANCE_ROLE_STYLE_ID)) {
                return InstanceRoleStyleEditPart.class;
            }
        }
        return super.getNodeEditPartClass(view);
    }
}