| what should be returned by ILinkHelper.findSelection() ? [message #496821] |
Wed, 11 November 2009 08:50  |
Eclipse User |
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Originally posted by: yoduderoo.netscape.net
Hi,
Am developing an Eclipse RCP app.
I have implemented my first linkHelper extension. Works fine when I
click on the common navigator view. Correct editor, as programmed in my
ILinkHelper impl, appears.
My problem is the other way: what should I return in
ILinkHelper.findSelection() when one of the editors is clicked?
After findSelection() is fired, there is no selection any longer in my
navigator. I suspect I am returning something unknown which results in
deselecting in common navigator.
Do I have to have the common nav instance and call it directly? Or
should I be able to fired off a generic selection which is understand by
the navigator?
Here is my findSelection() implementation:
public IStructuredSelection findSelection(IEditorInput anInput) {
if (anInput instanceof MyEditorInput) {
MyEditorInput edInput = (MyEditorInput) anInput;
return new StructuredSelection(edInput);
}
return StructuredSelection.EMPTY;
}
Any insight much appreciated!
Thanks,y
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| Re: what should be returned by ILinkHelper.findSelection() ? [message #496851 is a reply to message #496821] |
Wed, 11 November 2009 09:44  |
| Eclipse User |
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| Quote: | I have implemented my first linkHelper extension. Works fine when I
click on the common navigator view. Correct editor, as programmed in my
ILinkHelper impl, appears.
My problem is the other way: what should I return in
ILinkHelper.findSelection() when one of the editors is clicked?
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Hi y,
For synchronizing the other way (finding an item in the Navigator when your editor is clicked), you must return a selection containing the item in the Navigator View you want selected. Most of the time, this will be an IFile (a workspace File) - unless it is some sort of virtual model item you have added to the Navigator View yourself.
Have a look at org.eclipse.ui.internal.navigator.resources.workbench.Resour ceLinkHelper for an example. This is what the default implementation does:
public IStructuredSelection findSelection(IEditorInput anInput) {
IFile file = ResourceUtil.getFile(anInput);
if (file != null) {
return new StructuredSelection(file);
}
return StructuredSelection.EMPTY;
}
The default ResourceLinkHelper implementation should find the selection for you if your editor input is a normal workspace File, which means you don't need to re-implement it yourself (your code can just return StructuredSelection.EMPTY and let the default implementation work). Otherwise, if you have non-File resources you need to find in the navigator, your code will have to track them down in the tree and return those items. I do this in my link helper. But note that you can use a TreePath - which makes it easier for weird object hierarchies you've added to the Navigator view. For example:
return new StructuredSelection(new TreePath(new Object[] {project, myModelItemParent, myModelItemChild}));
I hope this helps,
Mark.
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