GMF:如何让网格显示在background，而不是foreground

喜欢ヅ旅行 2021-11-09 13:26 245阅读 0赞

**前言**

很久没写文章了，准备写一系列关于Eclipse RCP /Plugin的文章。 这些文章都是trouble shooting性质的，不准备写的很细，当你碰到这样的问题，google到时，能帮你把问题解决了，这就ok了。另外有些问题我也是不求甚解的，哈。

**正文**

GMF中，Grid，也就是用来对齐的网格，默认是显示在foreground的，这样网格就会覆盖在你的图形上面，看上去很糟糕。解决办法是在Editor中configureGraphicalViewer()方法添加如下代码

protected void configureGraphicalViewer() {
    	super.configureGraphicalViewer();
    	DiagramEditorContextMenuProvider provider = new DiagramEditorContextMenuProvider(this, getDiagramGraphicalViewer());
    	getDiagramGraphicalViewer().setContextMenu(provider);
    	getSite().registerContextMenu(ActionIds.DIAGRAM_EDITOR_CONTEXT_MENU, provider, getDiagramGraphicalViewer());
    	
    	//ADDED START
    	DiagramRootEditPart root = (DiagramRootEditPart) getDiagramGraphicalViewer().getRootEditPart();
    	Layer printableLayers = (Layer)root.getLayer(LayerConstants.PRINTABLE_LAYERS);
    	Layer gridLayer = (Layer)root.getLayer(LayerConstants.GRID_LAYER);
    	if (printableLayers != null && gridLayer != null){
    		LayeredPane paneForPrintable = (LayeredPane)printableLayers.getParent();
    		LayeredPane paneForGrid = (LayeredPane)gridLayer.getParent();
    		if (paneForGrid == paneForPrintable) {
    			paneForGrid.removeLayer(LayerConstants.GRID_LAYER);
    			paneForGrid.addLayerBefore(gridLayer, LayerConstants.GRID_LAYER, LayerConstants.PRINTABLE_LAYERS);
    		}
    	}
    	//ADDED END
    }

解决方案来自[http://www.eclipse.org/forums/index.php/t/296417/][http_www.eclipse.org_forums_index.php_t_296417]

转载于:https://www.cnblogs.com/Binhua-Liu/p/3266784.html

[http_www.eclipse.org_forums_index.php_t_296417]: http://www.eclipse.org/forums/index.php/t/296417/