Hello,
See my previous mail sent this saturday Oct 26, 2013 at 1:30 pm concerning
the problem.
I spent my saturday understanding how the new Decorator model works in
Qooxdoo 3.0, and understood why dynamic decorators don't work. Here are the
issues I found:
- first issue - dispose an old decorator before assigning a new one
If the decorator is disposed before assigning the new one to the component,
the component _applyDecorator() method calls getCssClassName() on a
disposed object, which returns qx-undefined, and the old decorator class is
not removed from the component
- second dissue - dispose an old decorator after assigning a new one
In qooxdoo 3.0, the decorator class is removed from the HTML component, but
not from the style sheet.
As object hashes are re-used from disposed objects, a new decorator may use
a hash from a disposed decorator.
When so, the new decorator will have the same css classname as the disposed
one, and when Widget._applyDecorator() calls
qx.theme.manager.Decoration.addCssClass(), the new decorator properties
will not be applied, as they already exist in the style sheet for this hash.
So, the new decorator properties will not be applied !
Here is how I temporarily? solved the problem:
- I use a subclassed version of qx.ui.decoration.Decorator, that only
defines a destructor which:
. gets the selector of the decorator to dispose
. removes the selector from the style sheet
destruct : function() {
var selector =
"."+qx.theme.manager.Decoration.getInstance().getCssClassName(this);
qx.ui.style.Stylesheet.getInstance().removeRule( selector);
}
- I only dispose an old decorator after assigning the new one to the widget.
I hope everything was clear. I don't know if this solution is fine. I'm
waiting for some feedback now. Maybe better solutions exist.
Regards,
Cyrille
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