intchooser.java

本项目是用JAVA3D开发的一款图形界面的3D漫游的类似引擎.至所以这么说.是因为它的部分功能还不完全.说它是引擎是因为它可以完全脱离模型文件.本引擎实现了虚拟漫游,碰撞检测,动态添加模型,以及部分纹

package cn.bz.util.swing;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
import java.util.Vector;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;

import cn.bz.util.IntEvent;


class IntChooser extends JPanel implements Java3DExplorerConstants {

  JComboBox combo;

  String[] choiceNames;

  int[] choiceValues;

  int current;

  Vector listeners = new Vector();

  IntChooser(String name, String[] initChoiceNames, int[] initChoiceValues,
      int initValue) {
    if ((initChoiceValues != null)
        && (initChoiceNames.length != initChoiceValues.length)) {
      throw new IllegalArgumentException(
          "Name and Value arrays must have the same length");
    }
    choiceNames = new String[initChoiceNames.length];
    choiceValues = new int[initChoiceNames.length];
    System
        .arraycopy(initChoiceNames, 0, choiceNames, 0,
            choiceNames.length);
    if (initChoiceValues != null) {
      System.arraycopy(initChoiceValues, 0, choiceValues, 0,
          choiceNames.length);
    } else {   //构造一个数组.将对应的序列号存入对应的索引里.
      for (int i = 0; i < initChoiceNames.length; i++) {
        choiceValues[i] = i;
      }
    }

    // Create the combo box, select the init value
    combo = new JComboBox(choiceNames);
    combo.setSelectedIndex(current);
    combo.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        JComboBox cb = (JComboBox) e.getSource();
        int index = cb.getSelectedIndex();
        setValueIndex(index);
      }
    });

    // set the initial value
    current = 0;
    setValue(initValue);

    // layout to align left
    setLayout(new BorderLayout());
    Box box = new Box(BoxLayout.X_AXIS);
    add(box, BorderLayout.WEST);

    box.add(new JLabel(name));
    box.add(combo);
  }

  IntChooser(String name, String[] initChoiceNames, int[] initChoiceValues) {
    this(name, initChoiceNames, initChoiceValues, initChoiceValues[0]);
  }

  IntChooser(String name, String[] initChoiceNames, int initValue) {
    this(name, initChoiceNames, null, initValue);
  }

  IntChooser(String name, String[] initChoiceNames) {
    this(name, initChoiceNames, null, 0);
  }

  public void addIntListener(IntListener listener) {
    listeners.add(listener);
  }

  public void removeIntListener(IntListener listener) {
    listeners.remove(listener);
  }

  public void setValueByName(String newName) {
    boolean found = false;
    int newIndex = 0;
    for (int i = 0; (!found) && (i < choiceNames.length); i++) {
      if (newName.equals(choiceNames[i])) {
        newIndex = i;
        found = true;
      }
    }
    if (found) {
      setValueIndex(newIndex);
    }
  }

  public void setValue(int newValue) {
    boolean found = false;
    int newIndex = 0;
    for (int i = 0; (!found) && (i < choiceValues.length); i++) {
      if (newValue == choiceValues[i]) {
        newIndex = i;
        found = true;
      }
    }
    if (found) {
      setValueIndex(newIndex);
    }
  }

  public int getValue() {
    return choiceValues[current];
  }

  public String getValueName() {
    return choiceNames[current];
  }

  public void setValueIndex(int newIndex) {
    boolean changed = (newIndex != current);
    current = newIndex;
    if (changed) {
      combo.setSelectedIndex(current);
      valueChanged();
    }
  }

  private void valueChanged() {
    // notify the listeners
    IntEvent event = new IntEvent(this, choiceValues[current]);
    for (Enumeration e = listeners.elements(); e.hasMoreElements();) {
      IntListener listener = (IntListener) e.nextElement();
      listener.intChanged(event);
    }
  }

}