displayable1.java

画格子的编程

package drawstringdemo;

import javax.microedition.lcdui.*;

public class Displayable1 extends Canvas implements CommandListener {
  private int currentFace = Font.FACE_SYSTEM;

  private Command monospaceCommand
      = new Command("monospace", Command.ITEM, 1);
  private Command proportionalCommand
      = new Command("proportional", Command.ITEM, 1);
  private Command systemCommand = new Command("system", Command.ITEM, 1);
  /** Constructor */
  public Displayable1() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  /**Component initialization*/
  private void jbInit() throws Exception {
    // Set up this Displayable to listen to command events
    setCommandListener(this);
    // add the Exit command
    addCommand(new Command("Exit", Command.EXIT, 1));
    setCommandListener(this);
    addCommand(monospaceCommand);
    addCommand(proportionalCommand);
    addCommand(systemCommand);
  }

  /**Handle command events*/
  public void commandAction(Command command, Displayable displayable) {
    /** @todo Add command handling code */
    if (command.getCommandType() == Command.EXIT) {
// stop the MIDlet
      MIDlet1.quitApp();
    }
    if (command == monospaceCommand) {
        currentFace = Font.FACE_MONOSPACE;
    } else if (command == proportionalCommand) {
        currentFace = Font.FACE_PROPORTIONAL;
    } else if (command == systemCommand) {
        currentFace = Font.FACE_SYSTEM;
    }
    repaint();
  }

  /** Required paint implementation */
  protected void paint(Graphics g) {
    /** @todo Add paint codes */
    String title;
    int height = 0;

    g.setColor(0x00000000);
    g.fillRect(0, 0, getWidth(), getHeight());

    g.setColor(0x00ffffff);
    switch (currentFace) {
    case Font.FACE_SYSTEM:
        title = "System";
        break;
    case Font.FACE_PROPORTIONAL:
        title = "Proportional";
        break;
    case Font.FACE_MONOSPACE:
        title = "Monospaced";
        break;
    default:
        title = "unknown";
        break;
    }
    g.drawString(title, 0, 0, Graphics.TOP|Graphics.LEFT);
    height += g.getFont().getHeight();

    g.setFont(Font.getFont(currentFace,
                           Font.STYLE_PLAIN,
                           Font.SIZE_LARGE));
    g.drawString("Regular plain", 0, height, Graphics.TOP|Graphics.LEFT);
    height += g.getFont().getHeight();

    g.setFont(Font.getFont(currentFace,
                           Font.STYLE_ITALIC,
                           Font.SIZE_LARGE));
    g.drawString("Regular ital", 0, height, Graphics.TOP|Graphics.LEFT);
    height += g.getFont().getHeight();

    g.setFont(Font.getFont(currentFace,
                           Font.STYLE_BOLD,
                           Font.SIZE_LARGE));
    g.drawString("Bold plain", 0, height, Graphics.TOP|Graphics.LEFT);
    height += g.getFont().getHeight();

    g.setFont(Font.getFont(currentFace,
                           Font.STYLE_BOLD|Font.STYLE_ITALIC,
                           Font.SIZE_LARGE));
    g.drawString("Bold ital", 0, height, Graphics.TOP|Graphics.LEFT);

  }

}