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CheckboxTreeViewer - correct CellEditor and Checkbox only at root elements? [message #23875]

Fri, 24 July 2009 10:50

Patrick Konemann

Messages: 116
Registered: July 2009

Senior Member

Hi everyone,

I am confused about the API of a CheckboxTreeViewer (Galileo Release).
The Javadoc for setCellEditors says:
"Since 3.3, an alternative API is available, see ViewerColumn.setEditingSupport(EditingSupport) for a more flexible way of editing values in a column viewer."

But the class TreeColumn doesn't seem to have the API mentioned.
Also the snippet in [1] refers to a TableViewer, not to a TreeViewer.
So what is the correct way of using cell editors here?
Still using setCellEditors, setColumnProperties, and setCellModifier?

And I am wondering if it is possible to have checkboxes only for root elements?
Right now, all elements in the tree have a checkbox attached.

Best regards
Patrick

[1] http://wiki.eclipse.org/JFaceSnippets#Snippet034CellEditorPe rRowNewAPI

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Re: CheckboxTreeViewer - correct CellEditor and Checkbox only at root elements? [message #23994 is a reply to message #23875]

Fri, 24 July 2009 14:44

Patrick Konemann

Messages: 116
Registered: July 2009

Senior Member

Hi again,

A follow-up question about checkboxes - I am not sure how to handle them:
If I use a cell editor to modify some data and call viewer.refresh(), all the checkbox states are gone, i.e. all items are unchecked again.
The workaround I see here is to manually iterate over all items again and set the checkbox state for each item.

Furthermore, after a refresh the entire tree is collapsed again.
Is there a trick how I can easily restore the state (collapsed/expanded items and the checkbox state) after a refresh?

Best regards
Patrick

On 24-07-2009 12:50, Patrick Könemann wrote:
> Hi everyone,
>
> I am confused about the API of a CheckboxTreeViewer (Galileo Release).
> The Javadoc for setCellEditors says:
> "Since 3.3, an alternative API is available, see
> ViewerColumn.setEditingSupport(EditingSupport) for a more flexible way
> of editing values in a column viewer."
>
> But the class TreeColumn doesn't seem to have the API mentioned.
> Also the snippet in [1] refers to a TableViewer, not to a TreeViewer.
> So what is the correct way of using cell editors here?
> Still using setCellEditors, setColumnProperties, and setCellModifier?
>
>
> And I am wondering if it is possible to have checkboxes only for root
> elements?
> Right now, all elements in the tree have a checkbox attached.
>
>
> Best regards
> Patrick
>
>
> [1] http://wiki.eclipse.org/JFaceSnippets#Snippet034CellEditorPe rRowNewAPI

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Re: CheckboxTreeViewer - correct CellEditor and Checkbox only at root elements? [message #24329 is a reply to message #23875]

Mon, 27 July 2009 16:55

Will Horn

Messages: 265
Registered: July 2009

Senior Member

"Patrick Könemann" <pk@imm.dtu.dk> wrote in message
news:h4c3lk$m31$1@build.eclipse.org...
> But the class TreeColumn doesn't seem to have the API mentioned.
Look at TreeViewerColumn.

> So what is the correct way of using cell editors here?
I'd use setEditingSupport.

> And I am wondering if it is possible to have checkboxes only for root
> elements?
> Right now, all elements in the tree have a checkbox attached.
I don't know the answer to this. I assume it is all or nothing with
checkboxes on a tree.

-Will

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Re: CheckboxTreeViewer - correct CellEditor and Checkbox only at root elements? [message #372840 is a reply to message #24329]

Wed, 29 July 2009 11:08

Patrick Konemann

Messages: 116
Registered: July 2009

Senior Member

Thanks Will, I'll give the TreeViewerColumn a try as soon as I have time.

Concerning the checkboxes, I use the workaround to mark the checkboxes gray of all elements which should not be checkable (using setGrayedElements).
Not the nicest solution, but it at least it works.

Best regards
Patrick

On 27-07-2009 18:55, Will Horn wrote:
>
> "Patrick Könemann" <pk@imm.dtu.dk> wrote in message
> news:h4c3lk$m31$1@build.eclipse.org...
>> But the class TreeColumn doesn't seem to have the API mentioned.
> Look at TreeViewerColumn.
>
>> So what is the correct way of using cell editors here?
> I'd use setEditingSupport.
>
>> And I am wondering if it is possible to have checkboxes only for root
>> elements?
>> Right now, all elements in the tree have a checkbox attached.
> I don't know the answer to this. I assume it is all or nothing with
> checkboxes on a tree.
>
> -Will

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Re: CheckboxTreeViewer - correct CellEditor and Checkbox only at root elements? [message #372841 is a reply to message #23994]

Wed, 29 July 2009 11:11

Patrick Konemann

Messages: 116
Registered: July 2009

Senior Member

Strange... I don't know what happened, but I cannot reproduce that behavior.
Now a refresh doesn't destroy the state of the tree any more :-D

Patrick

On 24-07-2009 16:44, Patrick Könemann wrote:
> Hi again,
>
> A follow-up question about checkboxes - I am not sure how to handle them:
> If I use a cell editor to modify some data and call viewer.refresh(),
> all the checkbox states are gone, i.e. all items are unchecked again.
> The workaround I see here is to manually iterate over all items again
> and set the checkbox state for each item.
>
> Furthermore, after a refresh the entire tree is collapsed again.
> Is there a trick how I can easily restore the state (collapsed/expanded
> items and the checkbox state) after a refresh?
>
> Best regards
> Patrick

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