Question

我试图在日食轮廓视图中显示我的GEF编辑器中包含的图形的微缩视图，但在大纲中它显示“轮廓不可用”。这是我创建的ContentOutlinePage：

import org.eclipse.draw2d.LightweightSystem;
import org.eclipse.draw2d.Viewport;
import org.eclipse.draw2d.parts.ScrollableThumbnail;
import org.eclipse.gef.GraphicalViewer;
import org.eclipse.gef.LayerConstants;
import org.eclipse.gef.editparts.ScalableRootEditPart;
import org.eclipse.gef.ui.parts.ContentOutlinePage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;

public class OverviewContentPage extends ContentOutlinePage {

  private ScrollableThumbnail thumbnail;
  private DisposeListener disposeListener;
  private GraphicalViewer viewer;

  public OverviewContentPage(GraphicalViewer viewer) {
    super(viewer);
    this.viewer = viewer;
  }

  @Override
  public void createControl(Composite parent) {
    Canvas canvas = new Canvas(new SashForm(parent, SWT.VERTICAL), SWT.BORDER);
    LightweightSystem lws = new LightweightSystem(canvas);
    thumbnail = new ScrollableThumbnail(
    (Viewport) ((ScalableRootEditPart) viewer.getRootEditPart()).getFigure());
    thumbnail.setSource(((ScalableRootEditPart) viewer.getRootEditPart()).getLayer(LayerConstants.PRINTABLE_LAYERS));
    lws.setContents(thumbnail);

    disposeListener = new DisposeListener() {
      @Override
      public void widgetDisposed(DisposeEvent e) {
         if (thumbnail != null) {
             thumbnail.deactivate();
              thumbnail = null;
         }
      }
    };

    viewer.getControl().addDisposeListener(disposeListener);
  }

  @Override
  public void dispose() {
    if(viewer != null) {
      if (viewer.getControl() != null && !viewer.getControl().isDisposed())
        viewer.getControl().removeDisposeListener(disposeListener);
      super.dispose();
    }
  }
}

在我的GEF编辑器中，我添加了以下几行：

@Override
  public Object getAdapter(Class type) {
    ...
    if(type == IContentOutlinePage.class) {
      return new OverviewContentPage(getGraphicalViewer());
    }
    return super.getAdapter(type);
  }

我错过了什么吗？

Answer 1

重写方法getControl（）解决了问题：

private SashForm sash;

...

@Override
public Control getControl() {
    return sash;
}

其中sash是在createControl（）中传递给LightweightSystem的SashForm。

Answer 2

基于user2035039的解决方案，我创建了GraphicalOutlineEditPartViewer，以便可以省略自己的OverviewContentPage实现。

public class GraphicalOutlineEditPartViewer extends AbstractEditPartViewer {

    public GraphicalOutlineEditPartViewer(GraphicalViewer graphicalViewer) {
        setRootEditPart(graphicalViewer.getRootEditPart());
    }

    @Override
    public Control createControl(Composite parent) {
        SashForm sashForm = new SashForm(parent, SWT.VERTICAL);
        Canvas canvas = new Canvas(sashForm, SWT.BORDER);
        RootEditPart rootEditPart = getRootEditPart();
        if (rootEditPart instanceof GraphicalEditPart) {
            GraphicalEditPart graphicalEditPart = (GraphicalEditPart) rootEditPart;

            IFigure figure = graphicalEditPart.getFigure();
            if (figure instanceof Viewport) {
                Viewport viewport = (Viewport) figure;

                ScrollableThumbnail thumbnail = new ScrollableThumbnail(viewport);
                DisposeListener disposeListener = new DisposeListener() {
                    @Override
                    public void widgetDisposed(DisposeEvent e) {
                        if (thumbnail != null) {
                            thumbnail.deactivate();
                        }
                        sashForm.removeDisposeListener(this);
                    }
                };
                sashForm.addDisposeListener(disposeListener);

                LightweightSystem lws = new LightweightSystem(canvas);
                lws.setContents(thumbnail);

                if (graphicalEditPart instanceof LayerManager) {
                    LayerManager layerManager = (LayerManager) graphicalEditPart;
                    IFigure printableLayer = layerManager.getLayer(LayerConstants.PRINTABLE_LAYERS);
                    thumbnail.setSource(printableLayer);
                }
            }
        }

        return sashForm;
    }


    @Override
    public EditPart findObjectAtExcluding(Point location, Collection exclusionSet, Conditional conditional) {
        return null;
    }
}

我仅使用由org.eclipse.gef.ui.parts.ContentOutlinePage提供的大纲页面

@Override
public Object getAdapter(Class type) {
    if (IContentOutlinePage.class.isAssignableFrom(type)) {
        GraphicalViewer graphicalViewer = getGraphicalViewer();
        GraphicalOutlineEditPartViewer viewer = new GraphicalOutlineEditPartViewer(graphicalViewer);
        return new ContentOutlinePage(viewer);
    }
    return super.getAdapter(type);
}

从GEF编辑器创建微缩轮廓视图

2 个答案: