import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
public void documentAboutToBeChanged(DocumentEvent event) {

			// default behavior: any document change outside a linked position
			// causes us to exit
			int end = event.getOffset() + event.getLength();
			for (int offset = event.getOffset(); offset <= end; offset++) {
				if (!fModel.anyPositionContains(offset)) {
					ITextViewer viewer = fCurrentTarget.getViewer();
					if (fFramePosition != null && viewer instanceof IEditingSupportRegistry) {
						IEditingSupport[] helpers = ((IEditingSupportRegistry) viewer).getRegisteredSupports();
						for (int i = 0; i < helpers.length; i++) {
							if (helpers[i].isOriginator(null,
									new Region(fFramePosition.getOffset(), fFramePosition.getLength())))
								return;
						}
					}

					leave(ILinkedModeListener.EXTERNAL_MODIFICATION);
					return;
				}
			}

			// Make sure that any document change is done inside a compound
			// change
			beginCompoundChangeIfNeeded();

		}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
private IEditingSupport createViewerHelper() {
	return new IEditingSupport() {
		public boolean isOriginator(DocumentEvent event, IRegion subjectRegion) {
			return true; // assume true, since we only register while we are active
		}
		public boolean ownsFocusShell() {
			return fIsQueryShowing;
		}

	};
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
private void registerHelper(IEditingSupport helper, JavaEditor editor) {
	ISourceViewer viewer= editor.getViewer();
	if (viewer instanceof IEditingSupportRegistry) {
		IEditingSupportRegistry registry= (IEditingSupportRegistry) viewer;
		registry.register(helper);
	}
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
private void deregisterHelper(IEditingSupport helper, JavaEditor editor) {
	ISourceViewer viewer= editor.getViewer();
	if (viewer instanceof IEditingSupportRegistry) {
		IEditingSupportRegistry registry= (IEditingSupportRegistry) viewer;
		registry.unregister(helper);
	}
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
private IEditingSupport createViewerHelper(final ITextSelection selection, final SelectTypeQuery query) {
	return new IEditingSupport() {

		public boolean isOriginator(DocumentEvent event, IRegion subjectRegion) {
			return subjectRegion.getOffset() <= selection.getOffset() + selection.getLength() &&  selection.getOffset() <= subjectRegion.getOffset() + subjectRegion.getLength();
		}

		public boolean ownsFocusShell() {
			return query.isShowing();
		}

	};
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
private void registerHelper(IEditingSupport helper) {
	ISourceViewer viewer= fEditor.getViewer();
	if (viewer instanceof IEditingSupportRegistry) {
		IEditingSupportRegistry registry= (IEditingSupportRegistry) viewer;
		registry.register(helper);
	}
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
private void deregisterHelper(IEditingSupport helper) {
	ISourceViewer viewer= fEditor.getViewer();
	if (viewer instanceof IEditingSupportRegistry) {
		IEditingSupportRegistry registry= (IEditingSupportRegistry) viewer;
		registry.unregister(helper);
	}
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
public void shellDeactivated(ShellEvent e) {
	// TODO re-enable after debugging
	// if (true) return;

	// from LinkedPositionUI:

	// don't deactivate on focus lost, since the proposal popups may
	// take focus
	// plus: it doesn't hurt if you can check with another window
	// without losing linked mode
	// since there is no intrusive popup sticking out.

	// need to check first what happens on reentering based on an open
	// action
	// Seems to be no problem

	// Better:
	// Check with content assistant and only leave if its not the
	// proposal shell that took the
	// focus away.

	StyledText text;
	final ITextViewer viewer;
	Display display;

	if (fCurrentTarget == null || (text = fCurrentTarget.fWidget) == null || text.isDisposed()
			|| (display = text.getDisplay()) == null || display.isDisposed()
			|| (viewer = fCurrentTarget.getViewer()) == null) {
		leave(ILinkedModeListener.EXIT_ALL);
	} else {
		// Post in UI thread since the assistant popup will only get the
		// focus after we lose it.
		display.asyncExec(new Runnable() {
			public void run() {
				if (fIsActive && viewer instanceof IEditingSupportRegistry) {
					IEditingSupport[] helpers = ((IEditingSupportRegistry) viewer).getRegisteredSupports();
					for (int i = 0; i < helpers.length; i++) {
						if (helpers[i].ownsFocusShell())
							return;
					}
				}

				// else
				leave(ILinkedModeListener.EXIT_ALL);

			}
		});
	}
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
public void register(IEditingSupport helper) {
    viewer.register(helper);
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
public void unregister(IEditingSupport helper) {
    viewer.unregister(helper);
}
 

import org.eclipse.jface.text.IEditingSupport; //导入依赖的package包/类
public IEditingSupport[] getRegisteredSupports() {
    return viewer.getRegisteredSupports();
}