Focus/default effect problem with JQuery UI Core Mouse Interaction Plugin

Focus/default effect problem with JQuery UI Core Mouse Interaction Plugin


Hi there -
We are noticing an issue with the core behaviour of the mouse plugin - it seems
that $.ui.mouse goes to some efforts to make sure that the event return code, for
example, for mouseDown is true/false as appropriate - but it would seem that
preventing the default event semantic could sometimes be problematic.
A particular case is its use, for example, in ui.draggable. Given that *all*
mouseDown events targetted at a node which is a draggable, which are
"acceptable drag start events" are trapped to return false, this means that
standard focus/blur semantics no longer operate in the node.
We have created a simple test case here:
file:///E:/workspace/fluid-components/src/webapp/tests/jquery-tests/manual/jQueryUI-focus-test.html
Without MIP applied to the node, clicking at different locations within it
operate default focus/blur. Once MIP is applied (in this case, via making it
draggable(), but this could have occurred by other means), it is no longer
possible to cause a blur() to be delivered via clicking within the node.
One solution to this might be to override the mouseCapture method to refine
the set of nodes which cause an MIP start on mouseDown - however, this would
seem to be more the responsibility of an extending widget rather than that
of clients of the widget themselves. Also, this still creates the situation
where a click which *might* be a drag start, does not also cause the default
browser blur() for some currently focused item.
What would be the consequences for overall JQuery UI architecture if
mouseDown never made a return of false?
Cheers,
Antranig.