wrappedcontent.java

java写的qq代码实现qq的部分功能

/*
* LumaQQ - Java QQ Client
*
* Copyright (C) 2004 luma <[e-mail]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package edu.tsinghua.lumaqq.widgets.rich;

import org.eclipse.swt.graphics.GC;

/**
 * 包含一个rich content，使其具有wrap功能
 * 
 * @author luma
 */
public class WrappedContent implements IWrappedRichContent {
    private static final int LINE_OFFSET = 0; 
    private static final int LINE_LENGTH = 1;
    
    private RichBox richbox;
    private IRichContent unwrappedContent;
    private ContentHelper unwrappedHelper;
    private WrappedLineStyler styler;
    private ContentHelper helper;
    
    // 存放硬行wrap之后各个硬行的软行偏移
    private int[] wrapped;
    // 软行总数
    private int softLineCount;
    // 软行偏移和长度数组
    private int[][] softLines;
	
	/**
	 * 创建content
	 */
	public WrappedContent(RichBox box, IRichContent content, ImageResolver resolver) {
	    richbox = box;
	    unwrappedContent = content;
	    unwrappedHelper = content.getContentHelper();
	    styler = new WrappedLineStyler(this, content.getLineStyler());
	    helper = new ContentHelper(this, resolver);
	    int lineCount = content.getLineCount();
	    wrapped = new int[lineCount];
	    softLines = new int[10][2];
	}
	
	/**
	 * 删除wrap偏移数据
	 * 
	 * @param start
	 * @param length
	 */
	private void removeWrapped(int start, int length) {
        if(start + length < wrapped.length)
            System.arraycopy(wrapped, start + length, wrapped, start, wrapped.length - start - length);
	}
	
	/**
	 * 插入空间到wrap数组
	 * 
	 * @param startIndex
	 * @param numLines
	 * @param oldLineCount
	 */
	private void insertWrapped(int startIndex, int numLines, int oldLineCount) {
        while(oldLineCount + numLines > wrapped.length)
            expandWrappedDouble();
        System.arraycopy(wrapped, startIndex, wrapped, startIndex + numLines, oldLineCount - startIndex);
	}
	
	/**
	 * 插入空间到行偏移长度数组
	 * 
	 * @param startIndex
	 * @param numLines
	 * @param oldLineCount
	 */
	private void insertSoftLines(int startIndex, int numLines, int oldLineCount) {
        while(oldLineCount + numLines > softLines.length)
            expandLineDouble();
        System.arraycopy(softLines, startIndex, softLines, startIndex + numLines, oldLineCount - startIndex);
	}
	
	/**
	 * 删除行
	 * 
	 * @param start
	 * @param length
	 */
	private void removeSoftLines(int start, int length) {
        if(start + length < softLines.length)
            System.arraycopy(softLines, start + length, softLines, start, softLines.length - start - length);
	}
	
	/**
	 * 扩展wrap数组
	 */
	private void expandWrappedDouble() {
        int[] newArray = new int[wrapped.length << 1];
        System.arraycopy(wrapped, 0, newArray, 0, wrapped.length);
        wrapped = newArray;	  
	}
	
	/**
	 * 保证wrap数组能满足一个容量的需求
	 * 
	 * @param minimum
	 */
	private void ensureWrappedSize(int minimum) {
	    if(minimum > wrapped.length) {
	        int[] newArray = new int[minimum + 10];
	        System.arraycopy(wrapped, 0, newArray, 0, wrapped.length);
	        wrapped = newArray;	        
	    }
	}

    /**
     * 成倍增加行数
     */
    private void expandLineDouble() {
        int[][] newLines = new int[softLines.length << 1][];
        System.arraycopy(softLines, 0, newLines, 0, softLines.length);
        softLines = newLines;
    }
    
    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#getLineCount()
     */
    public int getLineCount() {
        return softLineCount;
    }

    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#getLine(int)
     */
    public String getLine(int lineIndex) {
        int start = softLines[lineIndex][0];
        int length = softLines[lineIndex][1];
        while (length - 1 >= 0 && isDelimit(start + length - 1) )
            length--;
        return unwrappedContent.getText(start, length);
    }

    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#getLineAtOffset(int)
     */
    public int getLineAtOffset(int offset) {
        int low = 0;
        int high = softLineCount - 1;
        int middle = (low + high) >>> 1;
        for(; low < high; middle = (low + high) >>> 1) {
            if(offset >= softLines[middle][0])
                low = (middle == low) ? (low + 1) : middle;
            else
                high = (middle == high) ? (high - 1) : middle;
        }
        
        if(offset >= softLines[low][0])
            return low;
        else
            return low - 1;
    }

    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#getLineStartOffset(int)
     */
    public int getLineStartOffset(int lineIndex) {
        if(lineIndex < softLineCount)
            return softLines[lineIndex][0];
        else
            return getCharCount();
    }

    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#getText(int, int)
     */
    public String getText(int start, int length) {
        return unwrappedContent.getText(start, length);
    }

    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#getCharCount()
     */
    public int getCharCount() {
        return unwrappedContent.getCharCount();
    }

    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#setText(java.lang.String)
     */
    public void setText(String text) {
        unwrappedContent.setText(text);
        wrap(richbox.getClientArea().width - richbox.getLeftMargin() - richbox.getRightMargin());
    }

    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#isDelimit(int)
     */
    public boolean isDelimit(int i) {
        return unwrappedContent.isDelimit(i);
    }

    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.widgets.IRichContent#isImageTag(int)
     */
    public boolean isImageTag(int i) {
        return unwrappedContent.isImageTag(i);
    }