On Thu, Jun 14, 2012 at 4:16 PM, Derrell Lipman <
[email protected]> wrote:
> I am trying to respond to touchstart and touchmove events on a container.
> When I receive a touchstart or touchmove event, I start with
> widget=e.getTarget() and walk up the the layout parent chain with
> widget=widget.getLayoutParent() until I find a container on which I which I
> can operate.
>
> I'm finding, however, that if I add a qx.ui.mobile.list.List() to one of
> my containers, I get a parent of null during that walk, because
> e.getTarget() returns a qx.ui.mobile.container.Composite whose parent is a
> qx.ui.mobile.list.renderer.Default, which has a parent of null. This
> Default renderer is not properly in the layout chain!
>
> If the touchstart begins on a list item, how can I figure out which
> container the list is in?
>
> Thanks,
>
> Derrell
>
I've been thinking about this overnight, and I believe that the current
design is actually flawed. Here's why (from bug 6519 that I just posted)...
qx.ui.mobile.list.renderer.Default is a container, but it, itself, does not
contain anything. A layout parent is the container in which a widget is
contained. It should be possible to walk the widget tree from the root
container to all leaf widgets using _getChildren(), and conversely, it
should be possible to walk the widget tree from any leaf widget up to the
root widget, using _getLayoutParent(). At present, that doesn't work,
because list items have a layout parent (renderer.Default) which does not
have a layout parent. To fix this, list items should have their layout
parent set to be the list in which they are contained. Although the
renderer calls itself a container, it really isn't a container; rather, it
is really just a tool used to lay out the list item within the list.
In qx.Desktop, it is, I believe, always possible to walk the widget tree in
either direction. It should be possible in qx.Mobile as well.
Derrell
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