[203] lG 槛~ 迈过去!

protected void configureGraphicalViewer() {
       ...
       viewer.setProperty(SnapToGrid.PROPERTY_GRID_ENABLED,Boolean.TRUE); // 网格功能可用
       viewer.setProperty(SnapToGrid.PROPERTY_GRID_VISIBLE,Boolean.TRUE); // 网格可视
       viewer.setProperty(SnapToGeometry.PROPERTY_SNAP_ENABLED, Boolean.TRUE); // 自动吸附
}

	/**
	 * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
	 */
	public Object getAdapter(Class adapter) {
		if (adapter == SnapToHelper.class) {
			List snapStrategies = new ArrayList();
			Boolean val = (Boolean)getViewer().getProperty(RulerProvider.PROPERTY_RULER_VISIBILITY);
			if (val != null && val.booleanValue())
				snapStrategies.add(new SnapToGuides(this));
			val = (Boolean)getViewer().getProperty(SnapToGeometry.PROPERTY_SNAP_ENABLED);
			if (val != null && val.booleanValue())
				snapStrategies.add(new SnapToGeometry(this));
			val = (Boolean)getViewer().getProperty(SnapToGrid.PROPERTY_GRID_ENABLED);
			if (val != null && val.booleanValue())
				snapStrategies.add(new SnapToGrid(this));
			
			if (snapStrategies.size() == 0)
				return null;
			if (snapStrategies.size() == 1)
				return snapStrategies.get(0);

			SnapToHelper ss[] = new SnapToHelper[snapStrategies.size()];
			for (int i = 0; i < snapStrategies.size(); i++)
				ss[i] = (SnapToHelper)snapStrategies.get(i);
			return new CompoundSnapToHelper(ss);
		}
		return super.getAdapter(adapter);
	}