font_attribute_form.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch10;

import javax.microedition.lcdui.*;

//该类实现用户对字体属性的选择
public class Font_Attribute_Form
    extends Form
    implements ItemStateListener {

  //声明一个代表字体外观的int型属性变量
  int face;

  //声明一个代表字体样式的int型属性变量
  int style;

  //声明一个代表字体尺寸的int型属性变量
  int size;

  //声明一个代表字体外观选择组对象
  ChoiceGroup faceChoice;

  //声明一个代表字体样式选择组对象
  ChoiceGroup styleChoice;

  //声明一个代表字体尺寸选择组对象
  ChoiceGroup sizeChoice;

  /*
   3.构造器
   */
  public Font_Attribute_Form() {
    //设置窗体标题
    super("设置属性");

    faceChoice = new ChoiceGroup("外观", Choice.EXCLUSIVE);
    faceChoice.append("System字体", null);
    faceChoice.append("Monospace字体", null);
    faceChoice.append("Proportional字体", null);

    styleChoice = new ChoiceGroup("样式", Choice.MULTIPLE);
    styleChoice.append("黑体", null);
    styleChoice.append("斜体", null);
    styleChoice.append("下划线", null);

    sizeChoice = new ChoiceGroup("尺寸", Choice.EXCLUSIVE);
    sizeChoice.append("小字体", null);
    sizeChoice.append("中字体", null);
    sizeChoice.append("大字体", null);

    append(faceChoice);
    append(styleChoice);
    append(sizeChoice);

    setItemStateListener(this);
  }

  //设置字体外观属性值
  public void setFace(int face) {
    this.face = face;
  }

  //获取字体外观属性值
  public int getFace() {
    return face;
  }

  //设置字体样式属性值
  public void setStyle(int style) {
    this.style = style;
  }

  //获取字体样式属性值
  public int getStyle() {
    return style;
  }

  //设置字体尺寸属性值
  public void setSize(int size) {
    this.size = size;
  }

  //获取字体尺寸属性值
  public int getSize() {
    return size;
  }

  /*
   4.响应条目选择事件
   */
  public void itemStateChanged(Item item) {
    if (item == faceChoice) {
      int f = faceChoice.getSelectedIndex();
      switch (f) {
        case 0:
          face = Font.FACE_SYSTEM;
          break;
        case 1:
          face = Font.FACE_MONOSPACE;
          break;
        case 2:
          face = Font.FACE_PROPORTIONAL;
          break;
      }
    }
    else if (item == styleChoice) {
      style = 0;
      if (styleChoice.isSelected(0)) {
        style += Font.STYLE_BOLD;
      }
      if (styleChoice.isSelected(1)) {
        style |= Font.STYLE_ITALIC;
      }
      if (styleChoice.isSelected(2)) {
        style |= Font.STYLE_UNDERLINED;
      }
    }
    else if (item == sizeChoice) {
      int s = sizeChoice.getSelectedIndex();
      switch (s) {
        case 0:
          size = Font.SIZE_SMALL;
          break;
        case 1:
          size = Font.SIZE_MEDIUM;
          break;
        case 2:
          size = Font.SIZE_LARGE;
          break;
      }
    }
  }
}