Bug 148357 [Field Assist] - API - provide access for closing the proposal popup
I think that the field assist API needs more hooks to be customizable. For example : 1) There is no way to manually close/open the popup. Most of the times, this is the easier thing for a user to ask to implement his custom behaviour. 2) There is no way to intercept keystrokes/events directed to the field. 3) There is no way to control focus.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
Shell controlShell = control.getShell();
					controlShell.removeListener(SWT.Move, this);
					controlShell.removeListener(SWT.Resize, this);
				}
			}
		}
		/*
		 * The listener we will install on the target control.
		 */
		private final class TargetControlListener implements Listener {
			
			public void handleEvent(Event e) {
				if (!isValid()) {
					return;
				}
				char key = e.character;
				
				
				if (e.type == SWT.Traverse) {
					
					
					
					
					
					if (key != 0) {
						e.doit = false;
						return;
					}