更新zest中的節點的標籤/圖標2

Question

我正在使用GraphViewer和SpaceTreeLayoutAlgorithm並嘗試在圖形創建後更新節點的標籤/圖標。

在與各刷新組合

viewer.refresh(node, true); 

和

viewer.refresh(viewer.getGraphModelNode(node), true); 

已經測試的變體/重繪觀察者或其圖形控制的方法，但沒有成功。

的觀衆使用更多的細節：

GraphViewer viewer = new GraphViewer(parent, SWT.BORDER); 
ArrayContentProvider content = new MyArrayContentProvider(..); 

viewer.setContentProvider(content); 
LabelProvider glp = new MyGraphLabelProvider(..); 
viewer.setLabelProvider(glp); 

List<MyNodeClass> nodes = .. //list of all node elements 
viewer.setInput(nodes); 

TriangleSubgraphFactory subGraphFactory = new TriangleSubgraphFactory(); 
SpaceTreeLayoutAlgorithm spaceTreeAlg = new SpaceTreeLayoutAlgorithm(); 

viewer.getGraphControl().setSubgraphFactory(subGraphFactory); 
viewer.getGraphControl().setExpandCollapseManager(
    spaceTreeAlg.getExpandCollapseManager()); 
viewer.setLayoutAlgorithm(spaceTreeAlg, true); 

的代碼按預期工作，除了我上面提到的刷新。

我想我可能會做一些錯誤的事情，因爲根據Fabian的建議調用viewer.setInput（..）會導致錯誤。我也沒有設法使用SpaceTreeLayoutAlgorithm（int方向）除了TOP_DOWN以外的任何方向，否則我得到一個NPE。

調用viewer.setInput後來導致此：

Caused by: java.util.NoSuchElementException 
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:813) 
at java.util.HashMap$KeyIterator.next(HashMap.java:845) 
at org.eclipse.zest.core.widgets.custom.TriangleSubgraph.updateFigure(TriangleSubgraph.java:169) 
at org.eclipse.zest.core.widgets.custom.TriangleSubgraph$1.defaultHandle(TriangleSubgraph.java:147) 
at org.eclipse.zest.layouts.algorithms.TreeLayoutObserver$TreeListener.nodeRemoved(TreeLayoutObserver.java:308) 
at org.eclipse.zest.layouts.algorithms.TreeLayoutObserver$1.nodeRemoved(TreeLayoutObserver.java:344) 
at org.eclipse.zest.core.widgets.InternalLayoutContext.fireNodeRemovedEvent(InternalLayoutContext.java:399) 
at org.eclipse.zest.core.widgets.InternalNodeLayout.dispose(InternalNodeLayout.java:327) 
at org.eclipse.zest.core.widgets.Graph.removeNode(Graph.java:977) 
at org.eclipse.zest.core.widgets.GraphNode.dispose(GraphNode.java:188) 
at org.eclipse.zest.core.viewers.AbstractStructuredGraphViewer.inputChanged(AbstractStructuredGraphViewer.java:494) 
at org.eclipse.zest.core.viewers.GraphViewer.inputChanged(GraphViewer.java:136) 
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:280) 
at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1690) 

用於刷新以下的作品，但這不可能是使用目的：

GraphLabelProvider glp 
GraphNode n = viewer.getGraphModelNode(node); 
n.setText(glp.getText(node)); 
n.setImage(glp.getImage(node)); 

Answer 1

我不知道你怎麼樣完全使用查看器，但最簡單的方法可能是將查看器的輸入重置爲想要可視化的新數據（您在內容和標籤提供程序中處理的數據）。當您設置輸入時，圖表會自動更新：

viewer.setInput(myChangedDataToBeVisualized);