import org.eclipse.jface.text.link.ProposalPosition; //导入依赖的package包/类
/** Trigger content assist on choice positions */
private void triggerContentAssist() {
	if (fFramePosition instanceof ProposalPosition) {
		ProposalPosition pp = (ProposalPosition) fFramePosition;
		ICompletionProposal[] choices = pp.getChoices();
		if (choices != null && choices.length > 0) {
			fAssistant.setCompletions(choices);
			fAssistant.showPossibleCompletions();
			return;
		}
	}

	fAssistant.setCompletions(new ICompletionProposal[0]);
	fAssistant.hidePossibleCompletions();
}
 

import org.eclipse.jface.text.link.ProposalPosition; //导入依赖的package包/类
private void goToLinkedMode(ITextViewer viewer, int offset, IDocument doc, int exitPos, int iPar,
        List<Integer> offsetsAndLens) throws BadLocationException {
    if (!goToLinkedMode) {
        return;
    }
    if (offsetsAndLens.size() > 0) {
        LinkedModeModel model = new LinkedModeModel();

        for (int i = 0; i < offsetsAndLens.size(); i++) {
            Integer offs = offsetsAndLens.get(i);
            i++;
            Integer len = offsetsAndLens.get(i);
            if (i == 1) {
                firstParameterLen = len;
            }
            int location = offset + iPar + offs + 1;
            LinkedPositionGroup group = new LinkedPositionGroup();
            ProposalPosition proposalPosition = new ProposalPosition(doc, location, len, 0,
                    new ICompletionProposal[0]);
            group.addPosition(proposalPosition);
            model.addGroup(group);
        }

        model.forceInstall();

        final LinkedModeUI ui = new EditorLinkedModeUI(model, viewer);
        ui.setDoContextInfo(true); //set it to request the ctx info from the completion processor
        ui.setExitPosition(viewer, exitPos, 0, Integer.MAX_VALUE);
        Runnable r = new Runnable() {
            @Override
            public void run() {
                ui.enter();
            }
        };
        RunInUiThread.async(r);

    }
}
 

import org.eclipse.jface.text.link.ProposalPosition; //导入依赖的package包/类
@Override
public void apply(IDocument document) {
    try {
        //default apply
        int lineOfOffset = document.getLineOfOffset(fReplacementOffset);
        document.replace(fReplacementOffset, fReplacementLength, fReplacementString);

        if (SharedCorePlugin.inTestMode()) {
            return;
        }
        int lineOffset = document.getLineOffset(lineOfOffset);
        int lineLength = document.getLineLength(lineOfOffset);
        String lineDelimiter = document.getLineDelimiter(lineOfOffset);
        int lineDelimiterLen = lineDelimiter != null ? lineDelimiter.length() : 0;

        ISourceViewer viewer = sourceViewer;

        LinkedModeModel model = new LinkedModeModel();
        LinkedPositionGroup group = new LinkedPositionGroup();

        //the len-3 is because of the end of the string: " = " because the replacement string is
        //something like "xxx = " 
        ProposalPosition proposalPosition = new ProposalPosition(document, fReplacementOffset,
                fReplacementString.length() - 3, 0, new ICompletionProposal[0]);
        group.addPosition(proposalPosition);

        model.addGroup(group);
        model.forceInstall();

        final LinkedModeUI ui = new EditorLinkedModeUI(model, viewer);
        ui.setExitPosition(viewer, lineOffset + lineLength - lineDelimiterLen, 0, Integer.MAX_VALUE);
        Runnable r = new Runnable() {
            @Override
            public void run() {
                ui.enter();
            }
        };
        RunInUiThread.async(r);

    } catch (Throwable x) {
        // ignore
        Log.log(x);
    }
}