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problem with traversing thread items in mindmap tutorial [message #172334]

Tue, 12 February 2008 17:27

John Yotka

Messages: 144
Registered: July 2009

Senior Member

ThreadThreadItemCompartmentEditPart has the ListLayout set to true so
that it is a derived from a ListCompartmentEditPart. If you populate
this compartment with ThreadItems of varying string length you cannot
traverse the list using the up/down arrows as you would expect too.

The reason is that the navigateNextSibling/findSibling methods in
GraphicalViewerKeyHandler use the center point of the text (for each
ThreadItem) to compare positional relationships between the current
selected item and the other items in the compartment. If the next
item's text is sufficiently longer or shorter then the current item's
text, the comparison will consider that item to be either east or west
of the current item, not north or south. So it won't select it. In a
ListCompartmentEditPart the comparison point should be the center point
of the left edge, not the center point of the whole text!

My problem is that I have a compartment using the listLayout and need to
have the up/down arrows traverse as expected. Is there some way to
override these methods so that I can correct the behavior.

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Re: problem with traversing thread items in mindmap tutorial [message #172434 is a reply to message #172334]

Wed, 13 February 2008 14:18

Alexander Shatalin

Messages: 2928
Registered: July 2009

Senior Member

Hello John,

Try patching CompartmentEditPart.xpt in accordance and use it in code generation
process using "custom templates" GMF feature - this will help you to populate
this method into all the ListCompartmentEditParts in your generated diagram.
In addition you can file corresponding request for a GMF runtime.

-----------------
Alex Shatalin

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