Here is a summary of the solution in case it helps anyone. Because I had
chosen to implement the image code within a second pseudo-widget (...extends
Composite) that shared my UiBinder template with the main pseudo-widget
that implements most of my app's UI, I got into trouble. I neglected to add
this second pseudo-widget to the RootPanel as is normally done in the class
that implements EntryPoint. This left my Image widget unattached to the
widget chain, because its parent, the second pseudo-widget, was unattached.
And an Image widget must be attached to work.
What I ended up doing is moving the Image code back into my main app/GUI
class, i.e., into the first and now only pseudo-widget and abandoning the
special class for the Image code. I did that because it's simpler and the
Image code turns out not to be as long as I had originally thought -- not
deserving a separate class and .java file.
I still don't understand the purpose of the widget attachment chain/tree.
It seems not related to the DOM element/layout tree, as non-widget DOM
elements are not part the chain. Why, for instance, must an Image be
attached in order for it to be loaded with content?
On Tuesday, April 30, 2013 3:02:03 AM UTC-7, brec wrote:
>
> UiBinder template extract:
>
>> <div ui:field='myView' style='position:absolute; top:0; bot:0;
>> left:0; right:0;' class='{style.hidden}'>
>> <g:Image ui:field="myImage"/>
>> <g:Button ui:field='closeButton'
>> addStyleNames='{style.close-button}'>
>> <ui:text from='{strings.close}'/>
>> </g:Button>
>> </div>
>>
>
> The div's container is the HTMLPanel at the root of the template.
>
> @UiField Image myImage;
>> ...
>> myImage.setUrlAndVisibleRect(url, 0, 0, width, height);
>>
>
> By debugger inspection I see that at the point at which setUrl... is to be
> called, the Image has attached: false. What am I overlooking? (This is my
> first use of gwt-Image.)
>
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