If I have a property chain like this:
controller.selection[0].info.status
and I want to run some custom code if the status changes, I have used in
the past the following pattern:
controller.bind('selection[0].info.status', null, '', {
onUpdate: function() {
self._updateButtons();
}});
});
This would run my function:
- When the status flag changes.
- When the info object changes.
- When the selection changes.
- When the controller model changes.
In the current git master, this is broken (at least in source mode)
because if qx.debug is set, it will validate the arguments and refuse
the allow the null value.
Fair enough. But what is the alternative? What the databinding can do
here in watching the chain is highly useful, and highly complex. It's
not feasable to to add listeners to the selection, selection[0],
selection[0].info and seletion[0].info.status manually (and then manage
updating the listeners for the children as the parent objects change).
I can use a dummy-object with a dummy property as a target, but that
seems quite stupid.
Michael
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