在节点扩展/折叠的JFace TreeViewer中更改标签

我有一个TreeViewer，其中一些节点代表文件夹，所以我想在展开节点时显示打开文件夹的图标，并在折叠时显示关闭文件夹的图标。听起来很简单，我只需要添加一个树监听器（代码是Scala，但相当于Java应该很容易想象）：在节点扩展/折叠的JFace TreeViewer中更改标签

val tree = new TreeViewer(contents) 
tree.addTreeListener(folderIconFixingListener) 

private def folderIconFixingListener = new ITreeViewerListener { 
    def treeCollapsed(event: TreeExpansionEvent) { 
    tree.update(event.getElement, null) 
    } 

    def treeExpanded(event: TreeExpansionEvent) { 
    tree.update(event.getElement, null)  
    } 
}

不幸的是，这给出了一个例外：

Ignored reentrant call while viewer is busy. This is only logged once per viewer instance, but similar calls will still be ignored. 
java.lang.RuntimeException 
    at org.eclipse.jface.viewers.ColumnViewer.checkBusy(ColumnViewer.java:763) 
    at org.eclipse.jface.viewers.ColumnViewer.update(ColumnViewer.java:552) 
    at scsadmin.NodesTreeScreen$$anon$1.treeExpanded(NodesTreeScreen.scala:64) 
    at org.eclipse.jface.viewers.AbstractTreeViewer$3.run(AbstractTreeViewer.java:1101) 
    at org.eclipse.jface.util.SafeRunnable$1.run(SafeRunnable.java:128) 
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) 
    at org.eclipse.jface.viewers.AbstractTreeViewer.fireTreeExpanded(AbstractTreeViewer.java:1099) 
    at org.eclipse.jface.viewers.AbstractTreeViewer.handleTreeExpand(AbstractTreeViewer.java:1444) 
    at org.eclipse.jface.viewers.TreeViewer.handleTreeExpand(TreeViewer.java:937) 
    at org.eclipse.jface.viewers.AbstractTreeViewer$4.treeExpanded(AbstractTreeViewer.java:1453) 
    at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source) 
    at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source) 
    at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) 
    at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) 
    at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) 
    at org.eclipse.swt.widgets.Tree.gtk_test_expand_row(Unknown Source) 
    at org.eclipse.swt.widgets.Widget.windowProc(Unknown Source) 
    at org.eclipse.swt.widgets.Display.windowProc(Unknown Source) 
    at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method) 
    at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(Unknown Source) 
    at org.eclipse.swt.widgets.Display.eventProc(Unknown Source) 
    at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method) 
    at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(Unknown Source) 
    at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) 
    at org.eclipse.jface.window.Window.runEventLoop(Window.java:825) 
    at org.eclipse.jface.window.Window.open(Window.java:801) 
    at scsadmin.BootStrapper$.main(BootStrapper.scala:64) 
    at scsadmin.BootStrapper.main(BootStrapper.scala)

如何我能解决这个问题吗？

来源

2010-06-30 Alexey Romanov

你可以尝试把你的代码在你的听众变成asyncExec，推迟其执行了一下：

display.asyncExec(new Runnable(){ 
    public void run(){ 
     tree.update(.); 
    } 
});

来源

2010-07-04 10:00:13

的解决方案，我最终去与是在Tree控制自身使用TreeListener相反，哪些工作正常。

来源

2010-07-09 18:50:55

在节点扩展/折叠的JFace TreeViewer中更改标签

回答

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