java对话框的筹划[Java编程]

//: ToeTest.java
// Demonstration of dialog boxes
// and creating your own components
import java.awt.*;

class ToeButton extends Canvas {
  int state = ToeDialog.BLANK;
  ToeDialog parent;
  ToeButton(ToeDialog parent) {
    this.parent = parent;
  }
  public void paint(Graphics  g) {
    int x1 = 0;
    int y1 = 0;
    int x2 = size().width - 1;
    int y2 = size().height - 1;
    g.drawRect(x1, y1, x2, y2);
    x1 = x2/4;
    y1 = y2/4;
    int wide = x2/2;
    int high = y2/2;
    if(state == ToeDialog.XX) {
      g.drawLine(x1, y1, x1 + wide, y1 + high);
      g.drawLine(x1, y1 + high, x1 + wide, y1);
    }
    if(state == ToeDialog.OO) {
      g.drawOval(x1, y1, x1+wide/2, y1+high/2);
    }
  }
  public boolean 
  mouseDown(Event evt, int x, int y) {
    if(state == ToeDialog.BLANK) {
      state = parent.turn;
      parent.turn= (parent.turn == ToeDialog.XX ?
        ToeDialog.OO : ToeDialog.XX);
    } 
    else
      state = (state == ToeDialog.XX ? 
        ToeDialog.OO : ToeDialog.XX);
    repaint();
    return true;
  }
}

class ToeDialog extends Dialog {
  // w = number of cells wide
  // h = number of cells high
  static final int BLANK = 0;
  static final int XX = 1;
  static final int OO = 2;
  int turn = XX; // Start with x's turn
  public ToeDialog(Frame parent, int w, int h) {
    super(parent, "The game itself", false);
    setLayout(new GridLayout(w, h));
    for(int i = 0; i < w * h; i++)
      add(new ToeButton(this));
    resize(w * 50, h * 50);
  }
  public boolean handleEvent(Event evt) {
    if(evt.id == Event.WINDOW_DESTROY) 
      dispose();
    else 
      return super.handleEvent(evt);
    return true;
  }
}

public class ToeTest extends Frame {
  TextField rows = new TextField("3");
  TextField cols = new TextField("3");
  public ToeTest() {
    setTitle("Toe Test");
    Panel p = new Panel();
    p.setLayout(new GridLayout(2,2));
    p.add(new Label("Rows", Label.CENTER));
    p.add(rows);
    p.add(new Label("Columns", Label.CENTER));
    p.add(cols);
    add("North", p);
    add("South", new Button("go"));
  }
  public boolean handleEvent(Event evt) {
    if(evt.id == Event.WINDOW_DESTROY) 
      System.exit(0);
    else 
      return super.handleEvent(evt);
    return true;
  }
  public boolean action(Event evt, Object arg) {
    if(arg.equals("go")) {
      Dialog d = new ToeDialog(
        this, 
        Integer.parseInt(rows.getText()),
        Integer.parseInt(cols.getText()));
      d.show();
    } 
    else 
      return super.action(evt, arg);
    return true;
  }
  public static void main(String[] args) {
    Frame f = new ToeTest();
    f.resize(200,100);
    f.show();
  }
} ///:~

//: FileDialogTest.java
// Demonstration of File dialog boxes
import java.awt.*;

public class FileDialogTest extends Frame {
  TextField filename = new TextField();
  TextField directory = new TextField();
  Button open = new Button("Open");
  Button save = new Button("Save");
  public FileDialogTest() {
    setTitle("File Dialog Test");
    Panel p = new Panel();
    p.setLayout(new FlowLayout());
    p.add(open);
    p.add(save);
    add("South", p);
    directory.setEditable(false);
    filename.setEditable(false);
    p = new Panel();
    p.setLayout(new GridLayout(2,1));
    p.add(filename);
    p.add(directory);
    add("North", p);
  }
  public boolean handleEvent(Event evt) {
    if(evt.id == Event.WINDOW_DESTROY) 
      System.exit(0);
    else 
      return super.handleEvent(evt);
    return true;
  }
  public boolean action(Event evt, Object arg) {
    if(evt.target.equals(open)) {
      // Two arguments, defaults to open file:
      FileDialog d = new FileDialog(this,
        "What file do you want to open?");
      d.setFile("*.java"); // Filename filter
      d.setDirectory("."); // Current directory
      d.show();
      String openFile;
      if((openFile = d.getFile()) != null) {
        filename.setText(openFile);
        directory.setText(d.getDirectory());
      } else {
        filename.setText("You pressed cancel");
        directory.setText("");
      }
    } 
    else if(evt.target.equals(save)) {
      FileDialog d = new FileDialog(this,
        "What file do you want to save?",
        FileDialog.SAVE);
      d.setFile("*.java");
      d.setDirectory(".");
      d.show();
      String saveFile;
      if((saveFile = d.getFile()) != null) {
        filename.setText(saveFile);
        directory.setText(d.getDirectory());
      } else {
        filename.setText("You pressed cancel");
        directory.setText("");
      }
    } 
    else 
      return super.action(evt, arg);
    return true;
  }
  public static void main(String[] args) {
    Frame f = new FileDialogTest();
    f.resize(250,110);
    f.show();
  }
} ///:~