Tree: support indirect selection (aka checkbox tree)

[David Schwartz]

Ticket #7485 describes the notion of indirect selection. The tree widget should also support indirect selection. See the image below for an example of indirect selection within a hierarchical widget.

[bill]

bumping 1.4 tickets to 1.5, and most 1.3 tickets to 1.4

[Adam Peller]

My quick experiment to implement this feature in a subclass. Needs more work, particularly in initializing, storing, and accessing the states. Note that the toggle boxes here are vertically aligned on the far left and would likely be implemented as image hide/show via css, but could also be a standard checkbox

[bill]

Note that the checkboxes need to be tri-state, to indicate when some (but not all) of a parent's children are selected, see #12468.

[bill]

Also see ​http://www.thejekels.com/blog/dojo/dijit-tree-with-multi-state-checkboxes/, although need to find out if that person has a CLA (it's not even obvious whose blog that is).

[vvoovv]

There is also an implementation from Google: ​http://earth-api-samples.googlecode.com/svn/trunk/demos/dom-tree/index.html. Press "Load KML or KMZ" button to see the tree.

Though checkboxes there have only 2 states.

[bill]

Peter Jekel has checked in such a Tree as a separate project, at ​https://github.com/pjekel/cbtree. So closing this ticket.

See also his demo at ​http://www.thejekels.com/cbtree/demos/ and his blog post ​http://www.thejekels.com/blog/featured/the-new-dijit-checkbox-tree/. Report issues at ​https://github.com/pjekel/cbtree/issues.