Re: Image widget not attached?

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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