在Core J2ME Technology and MIDP一书中许多的可以在多个多行编辑组件(multiple TextBox)中共享剪贴板数据的例子。
注意：这个例子基于MIDP与CLDC 1.0.3版 本文得到作者John W. Muchow的允许，部分引用了Core J2ME Technology and MIDP, Sun Microsystems与Prentice Hall出版社 2002 Sun Microsystems Inc, 的内容。
源代码： [code]/*-------------------------------------------------- * SimpleClipBoard.java * * Example from the book: Core J2ME Technology * Copyright John W. Muchow http://www.CoreJ2ME.com * You may use/modify for any non-commercial purpose *-------------------------------------------------*/ import javax.microedition.midlet.*; import javax.microedition.lcdui.*;
public class SimpleClipBoard extends MIDlet implements CommandListener { private Display display; // 对显示对象的引用Reference to Display object private TextBox tbClip; // 主TextBox组件Main textbox private Command cmExit; // 退出命令Command to exit private Command cmStartMark; // 开始标记命令Command to start marking a block private Command cmCopy; // 复制剪贴板命令Command to copy to clipboard private Command cmPaste; // 粘贴剪贴板命令Command to paste into textbox private int beginOffset = 0; // 复制的开始索引The start index of copy private char[] clipBoard = null; // 剪贴板The clipboard private int clipBoardChars = 0; // 记录剪贴板中的字符Number of chars in clipboard
public SimpleClipBoard() { display = Display.getDisplay(this);
// Create the Commands. Notice the priorities assigned cmExit = new Command("Exit", Command.EXIT, 1); cmStartMark = new Command("Mark", Command.SCREEN, 2); cmCopy = new Command("Copy", Command.SCREEN, 3); cmPaste = new Command("Paste", Command.SCREEN, 4);
tbClip = new TextBox("Clip Board", "Tee to grn", 15, TextField.ANY); tbClip.addCommand(cmExit); tbClip.addCommand(cmStartMark); tbClip.addCommand(cmCopy); tbClip.addCommand(cmPaste); tbClip.setCommandListener(this);
// Allocate a clipboard big enough to hold the entire textbox clipBoard = new char[tbClip.getMaxSize()]; }
public void startApp() { display.setCurrent(tbClip); }
public void pauseApp() { }
public void destroyApp(boolean unconditional) { }
public void commandAction(Command c, Displayable s) { if (c == cmStartMark) { beginOffset = tbClip.getCaretPosition(); } else if (c == cmCopy && (tbClip.getCaretPosition() > beginOffset)) { // Allocate an array to hold the current textbox contents char[] chr = new char[tbClip.size()];
// Get the current textbox contents tbClip.getChars(chr);
// The count of characters in the clipboard clipBoardChars = tbClip.getCaretPosition() - beginOffset;
// Copy the text into the clipboard // arraycopy(source, sourceindex, dest, destindex, count) System.arraycopy(chr, beginOffset, clipBoard, 0, clipBoardChars); } else if (c == cmPaste) { // Make sure the paste will not overrun the textbox length. if ((tbClip.size() + clipBoardChars) <= tbClip.getMaxSize()) tbClip.insert(clipBoard, 0, clipBoardChars, tbClip.getCaretPosition()); } else if (c == cmExit) { destroyApp(false); notifyDestroyed(); } } }
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