First of all, Thank You Adam. This is one of those things that I spent
like 4 hours on and finally just asked about.
I put my absolute positioning code inside a DefferedCommand. Have not
seen it fail yet. So thank you, it seems to work.
Still, I do wonder. What is the deterministically appropriate way to
deal with this? For all I know the DefferedCommand may be the
appropriate way to deal with this, as it may truly guarantee that code
is not run till after all other events are run. Assuming that
"repositioning stuff as things are added to the DOM" is just another
event, then as long as DefferedCommand always guarantees that it will
add to the end, then it is probably correct.
However, is there some more direct way to do this. Like, could I wrap
a widget in something (or override some handler) such that I can
guarantee execution of code only after the widget has been fully
positioned and their currently exist not other DOM modifying events in
the queue?
Also, in closing, is there more information somewhere on exactly how
widgets are added, positioned, and rendered. I would also be
interested in any callbacks (or equivalent) that I can override at any
point in said process. Thanks all.
On May 1, 11:14 pm, Adam T <adam.t...@gmail.com> wrote:
> sometimes it's worth wrapping any repositioning up in a
> DeferredCommand to give the browser a chance, i.e. take you code that
> does something like this:
>
> int x = X.getAbsoluteTop;
> int h = X.getOffsetHeight();
> W.setWidgetPostition(x,y);
> W.setWidth(h/2+"px");
>
> and make it
>
> DeferredCommand.addCommand(new Command(){
> public void execute(){
> int x = X.getAbsoluteTop;
> int h = X.getOffsetHeight();
> W.setWidgetPostition(x,y);
> W.setWidth(h/2+"px");
> }
>
> });
>
> now the positioning code will execute a little later giving the
> browser chance to have redrawn everything and you should get more
> consistent answers.
>
> //Adam
>
> On 2 Maj, 01:12, Stephen Cagle <same...@gmail.com> wrote:
>
> > I have a Composite widget within which I have overridden the onResize
> > () method. Some of the element widgets of this widget position
> > themselves relative to other widgets. That is to say, I sometimes
> > position widget X using .getAbsoluteTop() and .getOffsetHeight().
> > Unfortunately, sometimes .getAbsoluteTop sometimes returns a pretty
> > random value. I think this is because I am re-populating/creating a
> > lot of the widgets upon resize. So maybe I am getting the size of the
> > widget "as it is being built". What should I do to deal with this. I
> > need to position things absolutely relative to other widgets, but
> > within the onResize() method, I am getting (occasionally) odd results?
>
>
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