[news.eclipse.platform.rcp] Re: How to add content assist in a form-base

[Channing Walton <channingwalton@xxxxxxx>]

Hi,
upon reflection I think I posted this to the wrong group. I'll try over at the SWT group.

Channing

Channing Walton wrote:
> Hi,
> I am trying to add content assist to a Text instance on a Form in a 
> Form-based editor in an RCP app, but have two problems:
>
> 1. the completion keybinding does not activate the content assist (do I 
> need to create the keybinding?)
>
> 2. after modifying the text in the Text widget, saving the editor 
> results in an exception from the SaveAction:
> org.eclipse.jface.util.Assert$AssertionFailedException: Assertion 
> failed: parent control has CueHandler: LayoutComposite {}
>     at org.eclipse.jface.util.Assert.isTrue(Assert.java:180)
>     at 
> org.eclipse.jface.contentassist.AbstractControlContentAssistSubjectAdapter$SmartFieldController$FieldFocusListener.install(AbstractControlContentAssistSubjectAdapter.java:622) 
>
>     at 
> org.eclipse.jface.contentassist.AbstractControlContentAssistSubjectAdapter$SmartFieldController$FieldFocusListener.focusGained(AbstractControlContentAssistSubjectAdapter.java:603) 
>
>     at 
> org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:105)
>     at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
>     at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1412)
>     at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1436)
>     at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1417)
>     at org.eclipse.swt.widgets.Control.sendFocusEvent(Control.java:1995)
>     at org.eclipse.swt.widgets.Control.forceFocus(Control.java:637)
>     at 
> org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:674)
>     at 
> org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2137)
>     at 
> org.eclipse.ui.internal.SaveableHelper.runProgressMonitorOperation(SaveableHelper.java:122) 
>
>     at 
> org.eclipse.ui.internal.SaveableHelper.savePart(SaveableHelper.java:100)
>     at 
> org.eclipse.ui.internal.EditorManager.savePart(EditorManager.java:1140)
>     at 
> org.eclipse.ui.internal.WorkbenchPage.savePart(WorkbenchPage.java:2741)
>     at 
> org.eclipse.ui.internal.WorkbenchPage.saveEditor(WorkbenchPage.java:2754)
>
> ----
>
> This is what I am doing to add the content assist:
>
> // add content assist to functionText
> private void addContentAssist() {
>         TextContentAssistSubjectAdapter adapter = new 
> TextContentAssistSubjectAdapter(functionText);
>         final SubjectControlContentAssistant assistant = new 
> SubjectControlContentAssistant();
>
>         assistant.enableAutoActivation(true);
>         assistant.enableAutoInsert(true);
>         assistant.enablePrefixCompletion(false);
>         assistant.setContentAssistProcessor(new 
> FieldDescriptorContentAssistProcessor(fieldDescriptors), 
> IDocument.DEFAULT_CONTENT_TYPE);
>
>         assistant.install(adapter);
>
>         ContentAssistHandler contentAssistHandler = 
> ContentAssistHandler.createHandlerForText(functionText, assistant);
>         contentAssistHandler.setEnabled(true);
>  }
>
> The content assistant is really basic with computeCompletionProposals 
> returning a set of Strings, but its never being called.
>
> I cannot find an example of using content assist in a formbased editor, 
> so any help is much appreciated.
>
> Channing