NonRuleBasedDamagerRepairer.java

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// Copyright (C) 2006-2016 Talend Inc. - www.talend.com
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package com.amalto.workbench.widgets.xmlviewer;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.text.presentation.IPresentationDamager;
import org.eclipse.jface.text.presentation.IPresentationRepairer;
import org.eclipse.swt.custom.StyleRange;

/**
 * DOC hbhong  class global comment. Detailled comment
 */
public class NonRuleBasedDamagerRepairer implements IPresentationDamager, IPresentationRepairer {

    protected IDocument document;

    protected TextAttribute defaultTextAttribute;

    public NonRuleBasedDamagerRepairer(TextAttribute defaultTextAttribute) {
        this.defaultTextAttribute = defaultTextAttribute;
    }

    public void setDocument(IDocument document) {
        this.document = document;
    }

    protected int endOfLineOf(int offset) throws BadLocationException {
        IRegion info = document.getLineInformationOfOffset(offset);
        if (offset <= info.getOffset() + info.getLength()) {
            return info.getOffset() + info.getLength();
        }
        int line = document.getLineOfOffset(offset);
        try {
            info = document.getLineInformation(line + 1);
            return info.getOffset() + info.getLength();
        } catch (BadLocationException _ex) {
            return document.getLength();
        }
    }

    public IRegion getDamageRegion(ITypedRegion partition, DocumentEvent event, boolean documentPartitioningChanged) {
        if (!documentPartitioningChanged)
            try {
                IRegion info = document.getLineInformationOfOffset(event.getOffset());
                int start = Math.max(partition.getOffset(), info.getOffset());
                int end = event.getOffset() + (event.getText() != null ? event.getText().length() : event.getLength());
                if (info.getOffset() <= end && end <= info.getOffset() + info.getLength()) {
                    end = info.getOffset() + info.getLength();
                } else {
                    end = endOfLineOf(end);
                }
                end = Math.min(partition.getOffset() + partition.getLength(), end);
                return new Region(start, end - start);
            } catch (BadLocationException _ex) {
            }
        return partition;
    }

    public void createPresentation(TextPresentation presentation, ITypedRegion region) {
        addRange(presentation, region.getOffset(), region.getLength(), defaultTextAttribute);
    }

    protected void addRange(TextPresentation presentation, int offset, int length, TextAttribute attr) {
        if (attr != null) {
            presentation
                    .addStyleRange(new StyleRange(offset, length, attr.getForeground(), attr.getBackground(), attr.getStyle()));
        }
    }
}