Now, this has gone from fun to just downright frustrating. I'm stuck at
the point of finding and wrapping the submit button. I get the ubiquitous,
"A widget that has an existing parent widget may not be added to the detach
list". Looked through the dozens of posts regarding that message. The
most common response is "don't use wrap() the way are using it". There's
also, "that's not the use case for wrap()". Maybe one of these is true in
my case.
Code is fairly simple.
*uibinder*:
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
xmlns:g="urn:import:com.google.gwt.user.client.ui">
<g:ScrollPanel width="100%" height="100%" ui:field="mainScrollPanel"/>
</ui:UiBinder>
*The view class's onLoad()* (this is an Activites and Places app that uses
MVP). So this view is on the right side of a splitterpanel. The left side
has a stackpanel (think of the mail example). When the appropriate stack
panel item is selected, this view appears on the right of the splitter.
public class ReviewView extends ResizeComposite
{
...
@UiField ScrollPanel mainScrollPanel;
private String html; // Set in a separate method and called before
onLoad(). This HTML comes from an external source.
...
public void onLoad()
{
mainScrollPanel.clear();
HTMLPanel htmlPanel = new HTMLPanel( html );
mainScrollPanel.add( htmlPanel );
Element submitButtonElement = htmlPanel.getElementById( "save" ); //
This appears to work, without being deferred. I tried it defered also.
Button submitButton = Button.wrap( submitButtonElement );
// This is where the assert exception occurs.
}
}
Of course the HTMLPanel has a parent widget, the ReviewView. And it is
nested inside of a ScrollPanel, which is nested in a SplitterLayoutPanel,
which is inside a RootLayoutPanel. There are probably widgets attached to
all of those. So, can this be done? One solution in the posts is to wrap()
from the inside out. With an A&P app this seems nearly impossible as
Widgets are always embedded in Widgets. What is the point of wrap() if it
is so finicky()?
I also tried deferred method, replacing HTMLPanel with MyHtmlPanel:
*onLoad()* looks like this:
MyHtmlPanel htmlPanel = new MyHtmlPanel( html );
mainScrollPanel.add( htmlPanel );
And *MyHtmlPanel *looks like this:
private class MyHtmlPanel extends HTMLPanel
{
public MyHtmlPanel( String html )
{
super( html );
}
protected void onAttach()
{
Element submitButtonElement = this.getElementById( "save" ); // Appears
to work.
Button submitButton = Button.wrap( submitButtonElement ); // Same
error occurs here.
}
protected void onDetach()
{
}
}
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