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HandlerUtil.currentSelection returns null [message #542337]

Thu, 24 June 2010 14:49

david borsodi

Messages: 19
Registered: July 2009

Junior Member

Hello

I'm quite new to RPC dev, and also to this forum. (So I hope "Come here to participate in technical discussions about how to use the Rich Client Platform (RCP)." covers my question as well, if not, please tell me where to post it)

I have the following problem:
1. I have a view with a treeviewer.
2. a command, which adds a new element to the tree
so far, it works.
In the handler, I call
TreeSelection selection = (TreeSelection) HandlerUtil.getCurrentSelection(event);
to get the current selection so if a node is selected, that one will be the default parent. But! This returns null, even if I already selected a node.
After debugging it turned out that the selection variable is set to a plain "Object" object in the runtime framework, and at this point, in HandlerUtil.getVariable()
return var == IEvaluationContext.UNDEFINED_VARIABLE ? null : var;
null is returned.
I think, this might be the source of the problem, but I don't know why this happens...
My command handler is registered through the plugin.xml for my plugin.
please help me. If more details are required I can post them
thanks
david

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Re: HandlerUtil.currentSelection returns null [message #542351 is a reply to message #542337]

Thu, 24 June 2010 15:13

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

What code did you use in your createPartControl(*) to hook up your
viewer to the system?

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse .platform.doc.isv/guide/workbench.htm

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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Re: HandlerUtil.currentSelection returns null [message #542357 is a reply to message #542351]

Thu, 24 June 2010 15:26

david borsodi

Messages: 19
Registered: July 2009

Junior Member

This:
fileTree = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
fileTree.setContentProvider(new FileBrowserContentProvider());
fileTree.setLabelProvider(new FileBrowserLabelProvider());
BrowserTreeNode root = initTree();
fileTree.setInput(root);

david

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