On Thu, Jan 5, 2012 at 3:21 PM, Rob <[email protected]> wrote:
> Hi,
>
> Why does this not work? "Header top" appears, but nothing else. The
> divs inside the dock layout have zero height. HeaderPanel calls
> onResize for it's 'content' element. Is that not enough to work with
> LayoutPanels? If I remove the HeaderPanel, the DockLayoutPanel works
> as expected. I want to use HeaderPanel, because I want a top div that
> is sized naturally by the browser.
>
Calling onResize() is not sufficent, no, its really only used for being
notified that the size has changed, not for setting the size. A LayoutPanel
needs to be either added to another LayoutPanel, such as RootLayoutPanel,
or be given a size explicitly. Unfortunately HeaderPanel is not a
LayoutPanel (though it does need to be put inside one itself) so I'm not
sure the best way to do this....
Just looking at how RootLayoutPanel does its business, in its onLoad()
method, it has:
@Override
protected void onLoad() {
getLayout().onAttach();
getLayout().fillParent();
}
So maybe extending LayoutPanel and doing something similar would do the
job, but really I don't know if this is a good idea or not! Your other
options would be to use a static sized header, or use a DockLayoutPanel
with a 'north' section that re-sizes itself when ever the content height
changes (you can use the 'scrollHeight' property of the container element
to measure how much height you need) but that's obviously a pretty ugly way
to do it.
I'd be interested to hear if getLayout().fillParent() does in fact work for
this, or if anyone else uses it successfully. I think you'd have to call
your custom LayoutPanel's onResize() method yourself, whenever the headers
content/size changes.. so that any child widgets that need onResize() get
notified of less/more space available. So, not much different than
re-sizing your header manually.. :(
Probably best to use a static height header if you want to save some time!
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