Palette的多种样式

前几天看一个开源项目，发现GEF中的Palette样式与自己经常用的样式不一样
见图一和图二，我觉得图二的样式比较好看，呵呵


    于是查看了下代码，最后定位到PaletteViewerProvider类上，

/**
 * This method is invoked from {@link #configurePaletteViewer(PaletteViewer)}.  It
 * configures the given viewer's settings.
 * @param	viewer	the viewer that is to be configured
 */
protected void configurePaletteViewer(PaletteViewer viewer) {
	viewer.setContextMenu(new PaletteContextMenuProvider(viewer));
}

从上面的代码可以看出PaletteViewer 增加了一个右键菜单，而PaletteContextMenuProvider中则提供了好多样式

/**
 * This is the method that builds the context menu.
 * 
 * @param	menu	The IMenuManager to which actions for the palette's context menu can 
 *                  be added.
 * @see ContextMenuProvider#buildContextMenu(org.eclipse.jface.action.IMenuManager)
 */
public void buildContextMenu(IMenuManager menu) {
	GEFActionConstants.addStandardActionGroups(menu);

	Object selectedPart = getPaletteViewer().getSelectedEditParts().get(0);
	if (selectedPart instanceof DrawerEditPart 
					&& ((DrawerEditPart)selectedPart).canBePinned()) {
		menu.appendToGroup(GEFActionConstants.MB_ADDITIONS, 
						new PinDrawerAction((DrawerEditPart)selectedPart));
	}
	menu.appendToGroup(GEFActionConstants.GROUP_VIEW, new LayoutAction(
			getPaletteViewer().getPaletteViewerPreferences()));
	menu.appendToGroup(GEFActionConstants.GROUP_VIEW, new ChangeIconSizeAction(
			getPaletteViewer().getPaletteViewerPreferences()));
	if (getPaletteViewer().getCustomizer() != null) {
		menu.appendToGroup(GEFActionConstants.GROUP_REST, 
							new CustomizeAction(getPaletteViewer()));
	}
	menu.appendToGroup(GEFActionConstants.GROUP_REST, 
						new SettingsAction(getPaletteViewer()));
}

剩下的事情就好办了，在GraphicalEditorWithFlyoutPalette的实现类中覆盖下面方法

	@Override
	protected PaletteViewerProvider createPaletteViewerProvider() {
		return new PaletteViewerProvider(getEditDomain()) {
			@Override
			protected void configurePaletteViewer(PaletteViewer viewer) {
				viewer.addDragSourceListener(new TemplateTransferDragSourceListener(viewer));
				viewer.setContextMenu(new PaletteContextMenuProvider(viewer));
			}

			@Override
			public PaletteViewer createPaletteViewer(Composite parent) {
				pViewer = new PaletteViewer();
				pViewer.createControl(parent);
				configurePaletteViewer(pViewer);
				hookPaletteViewer(pViewer);
				return pViewer;
			}
		};
	}

这下在Palette上点击右键的时候就可以看到弹出菜单，菜单中拥有了一些给定的样式
，图三的右键弹出菜单

可是如果要程度打开的时候就显示图二的样式应该怎么办呢，下面代码段可以实现

		pViewer.getPaletteViewerPreferences().setLayoutSetting(PaletteViewerPreferences.LAYOUT_COLUMNS);
		pViewer.getPaletteViewerPreferences().setUseLargeIcons(PaletteViewerPreferences.LAYOUT_COLUMNS, true);

但要把它放在

@Override
	protected void configureGraphicalViewer()

方法中，否则会报空指针

评论

1 楼 凝血神抓 2009-06-25