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/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.text;


/**
 * This event is sent to implementers of
 * {@link org.eclipse.jface.text.ITextListener}. It represents a change applied
 * to text viewer. The change is specified as a replace command using offset,
 * length, inserted text, and replaced text. The text viewer issues a text event
 * after the viewer has been changed either in response to a change of the
 * viewer's document or when the viewer's visual content has been changed. In
 * the first case, the text event also carries the original document event.
 * Depending on the viewer's presentation mode, the text event coordinates are
 * different from the document event's coordinates.
 * 
 * An empty text event usually indicates a change of the viewer's redraw state.
 * 
 * Clients other than text viewer's don't create instances of this class.
 *
 * @see org.eclipse.jface.text.ITextListener
 * @see org.eclipse.jface.text.ITextViewer
 * @see org.eclipse.jface.text.DocumentEvent
 */
public class TextEvent {

	/** Start offset of the change */
	private int fOffset;
	/** The length of the change */
	private int fLength;
	/** Inserted text */
	private String fText;
	/** Replaced text */
	private String fReplacedText;
	/** The original document event, may by null */
	private DocumentEvent fDocumentEvent;
	/**
	 * The redraw state of the viewer issuing this event
	 * @since 2.0
	 */
	private boolean fViewerRedrawState;

	/**
	 * Creates a new TextEvent based on the specification.
	 *
	 * @param offset the offset
	 * @param length the length
	 * @param text the inserted text
	 * @param replacedText the replaced text
	 * @param event the associated document event or null if none
	 * @param viewerRedrawState the redraw state of the viewer
	 */
	protected TextEvent(int offset, int length, String text, String replacedText, DocumentEvent event, boolean viewerRedrawState) {
		fOffset= offset;
		fLength= length;
		fText= text;
		fReplacedText= replacedText;
		fDocumentEvent= event;
		fViewerRedrawState= viewerRedrawState;
	}

	/**
	 * Returns the offset of the event.
	 *
	 * @return the offset of the event
	 */
	public int getOffset() {
		return fOffset;
	}

	/**
	 * Returns the length of the event.
	 *
	 * @return the length of the event
	 */
	public int getLength() {
		return fLength;
	}

	/**
	 * Returns the text of the event.
	 *
	 * @return the text of the event
	 */
	public String getText() {
		return fText;
	}

	/**
	 * Returns the text replaced by this event.
	 *
	 * @return the text replaced by this event
	 */
	public String getReplacedText() {
		return fReplacedText;
	}

	/**
	 * Returns the corresponding document event that caused the viewer change
	 *
	 * @return the corresponding document event, null if a visual change only
	 */
	public DocumentEvent getDocumentEvent() {
		return fDocumentEvent;
	}

	/**
	 * Returns the viewer's redraw state.
	 *
	 * @return true if the viewer's redraw state is true
	 * @since 2.0
	 */
	public boolean getViewerRedrawState() {
		return fViewerRedrawState;
	}
}