Java/J2ME

Материал из Java эксперт

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Font Canvas

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
public class FontCanvas extends Canvas {
  private Font systemFont, monospaceFont, proportionalFont;
  public FontCanvas() {
    this(Font.STYLE_PLAIN);
  }
  public FontCanvas(int style) {
    setStyle(style);
  }
  public void setStyle(int style) {
    systemFont = Font.getFont(Font.FACE_SYSTEM, style, Font.SIZE_MEDIUM);
    monospaceFont = Font.getFont(Font.FACE_MONOSPACE, style, Font.SIZE_MEDIUM);
    proportionalFont = Font.getFont(Font.FACE_PROPORTIONAL, style, Font.SIZE_MEDIUM);
  }
  public void paint(Graphics g) {
    int w = getWidth();
    int h = getHeight();
    // Clear the Canvas.
    g.setGrayScale(255);
    g.fillRect(0, 0, w - 1, h - 1);
    g.setGrayScale(0);
    g.drawRect(0, 0, w - 1, h - 1);
    int x = w / 2;
    int y = 20;
    y += showFont(g, "System", x, y, systemFont);
    y += showFont(g, "Monospace", x, y, monospaceFont);
    y += showFont(g, "Proportional", x, y, proportionalFont);
  }
  private int showFont(Graphics g, String s, int x, int y, Font f) {
    g.setFont(f);
    g.drawString(s, x, y, Graphics.TOP | Graphics.HCENTER);
    return f.getHeight();
  }
}





Font Canvas MIDlet

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class FontCanvasMIDlet extends MIDlet {
   public FontCanvasMIDlet() { // constructor
   }
   public void startApp() {
      Canvas canvas = new FontCanvas();
      Display display = Display.getDisplay(this);
      display.setCurrent(canvas);
   }
   public void pauseApp() {
   }
   public void destroyApp(boolean unconditional) {
   }
}
class FontCanvas extends Canvas {
   public void paint(Graphics g) {
      g.setColor(0xffffff);
      g.fillRect(0, 0, getWidth(), getHeight());
      g.setColor(0x000000);
      g.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_LARGE));
      g.drawString("System Font", 0, 0, g.LEFT | g.TOP);
      g.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM));
      g.drawString("Medium Size", 0, 15, g.LEFT | g.TOP);
      g.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_BOLD, Font.SIZE_MEDIUM));
      g.drawString("Bold Style", 0, 30, g.LEFT | g.TOP);
      g.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_ITALIC, Font.SIZE_MEDIUM));
      g.drawString("Italic Style", 0, 45, g.LEFT | g.TOP);
      g.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_UNDERLINED, Font.SIZE_MEDIUM));
      g.drawString("Underlined Style", 0, 60, g.LEFT | g.TOP);
   }
}





Font MIDlet

/*
Wireless Java 2nd edition 
Jonathan Knudsen
Publisher: Apress
ISBN: 1590590775 
*/
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class FontMIDlet extends MIDlet implements CommandListener {
  private FontCanvas mFontCanvas;
  private Command mBoldCommand, mItalicCommand, mUnderlineCommand;
 
  public FontMIDlet() {
    mFontCanvas = new FontCanvas();
    mBoldCommand = new Command("Bold", Command.SCREEN, 0);
    mItalicCommand = new Command("Italic", Command.SCREEN, 0);
    mUnderlineCommand = new Command("Underline", Command.SCREEN, 0);
    Command exitCommand = new Command("Exit", Command.EXIT, 0);
 
    mFontCanvas.addCommand(mBoldCommand);
    mFontCanvas.addCommand(mItalicCommand);
    mFontCanvas.addCommand(mUnderlineCommand);
    mFontCanvas.addCommand(exitCommand);
    mFontCanvas.setCommandListener(this);
  }
 
  public void startApp() {
    Display.getDisplay(this).setCurrent(mFontCanvas);
  }
 
  public void pauseApp() {}
  public void destroyApp(boolean unconditional) {}
 
  public void commandAction(Command c, Displayable s) {
    if (c.getCommandType() == Command.EXIT) {
      notifyDestroyed();
      return;
    }
 
    boolean isBold = mFontCanvas.isBold() ^ (c == mBoldCommand);
    boolean isItalic = mFontCanvas.isItalic() ^ (c == mItalicCommand);
    boolean isUnderline = mFontCanvas.isUnderline() ^
        (c == mUnderlineCommand);
 
    int style = 
        (isBold ? Font.STYLE_BOLD : 0) |
        (isItalic ? Font.STYLE_ITALIC : 0) |
        (isUnderline ? Font.STYLE_UNDERLINED : 0);
 
    mFontCanvas.setStyle(style);
    mFontCanvas.repaint();
  }
}


Источник — «http://jexp.ru/index.php/Java/J2ME»