Categories: Java | Java ME | Code Examples

This page was last modified 23:04, 3 July 2008.

From Forum Nokia Wiki

The following example adds copy and paste (clipboard) operations to a TextBox component.

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
 
 
 
public class SimpleClipBoard extends MIDlet implements CommandListener {
    private Display display; // Reference to Display object
    private TextBox tbClip; // Main textbox
    private Command cmExit; // Command to exit
    private Command cmStartMark; // Command to start marking a block
    private Command cmCopy; // Command to copy to clipboard
    private Command cmPaste; // Command to paste into textbox
    private int beginOffset = 0; // The start index of copy
    private char[] clipBoard = null; // The clipboard
    private int clipBoardChars = 0; // 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();
        }
    }
}