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为textbox组件创建简单的剪贴板(matrix-corej2me系列)
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：
/*--------------------------------------------------
* 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();
}
}
}
源代码下载:下载
关于翻译作者:bruceyuki,java c#技术爱好者，现就读于新西兰奥克兰大学，正参与大学的一个ai项目,可以点击http://www.matrix.org.cn/user_view.asp?username=bruceyuki查看他的个人信息
