Question

大家好我似乎对我的applet布局有问题，我在applet中有一个5按钮（群集）位于顶部（北）中心我希望它们位于底部（南）applet的中心，任何人都可以帮助它到底部吗？ - 按钮集群很好我只是希望它在我的applets框架的底部没有像现在这样的顶部（我想移动按钮集群）到底部）...谢谢你们

 import java.awt.*;
 import java.awt.event.*;
 import java.applet.*;


  public class moveIt extends Applet implements ActionListener

      {

 private Image cup;
 private Panel Keypad = new Panel();
 public int top = 15;
 public int left = 15;
 private Button Keyarray[] = new Button[5];
 public void init ()
 {
cup=getImage(getDocumentBase(), "cup.gif");
Canvas myCanvas= new Canvas();


 Keyarray[0] = new Button ("Up");
 Keyarray[1] = new Button ("Left");
 Keyarray[2] = new Button ("Down");
 Keyarray[3] = new Button ("Right");
 Keyarray[4] = new Button ("Center");
 setBackground(Color.BLUE);

 Panel frame = new Panel();
 frame.setLayout(new BorderLayout());
 frame.add(myCanvas, BorderLayout.NORTH);
 Keypad.setLayout(new BorderLayout());     
 frame.add(Keypad, BorderLayout.SOUTH);
 //Keypad.setLayout(new BorderLayout());


 Keypad.add(Keyarray[0], BorderLayout.NORTH);
 Keypad.add(Keyarray[1], BorderLayout.WEST);
 Keypad.add(Keyarray[2], BorderLayout.SOUTH);
 Keypad.add(Keyarray[3], BorderLayout.EAST);
 Keypad.add(Keyarray[4], BorderLayout.CENTER);

 Keyarray[0].addActionListener(this);
 Keyarray[1].addActionListener(this);
 Keyarray[2].addActionListener(this);
 Keyarray[3].addActionListener(this);
 Keyarray[4].addActionListener(this);


 }//end of method init


 public void paint(Graphics g)


 {

     g.drawImage(cup, left, top, this);

 }

 public void actionPerformed(ActionEvent e)
 {
     String arg= e.getActionCommand();

      if (arg.equals("Up"))
            top -= 15;
        if (arg.equals("down"))
            top += 15;
        if (arg.equals("Left"))
            left -= 15;
        if (arg.equals("Right"))
            left += 15;
        if (arg.equals("Center"))
        {
            top=60;
            left=125;
        }

     repaint();



      }//end paint method

   }//end of class

Answer 1

我不确定我是否明白了......这就是我如何修改init（）以使按钮位于底部区域。

我还将画布移动到中心，因为如果你在北方有它，你就看不到它，因为它是0x0大小。无论如何，我不确定这是你真正想要的，所以也许你必须把它移回到北方。

基本上我解决按钮问题的方法就是删除你的Panel框架并将BorderLayout manager设置为applet。

public void init() {
  cup = getImage(getDocumentBase(), "cup.gif");
  Canvas myCanvas = new Canvas();

  Keyarray[0] = new Button("Up");
  Keyarray[1] = new Button("Left");
  Keyarray[2] = new Button("Down");
  Keyarray[3] = new Button("Right");
  Keyarray[4] = new Button("Center");
  setBackground(Color.BLUE);

  // I just removed Panel frame and added components directly to applet
  setLayout(new BorderLayout());
  add(myCanvas, BorderLayout.CENTER);
  myCanvas.setBackground(Color.red);
  Keypad.setLayout(new BorderLayout());
  add(Keypad, BorderLayout.SOUTH);
  // Keypad.setLayout(new BorderLayout());

  Keypad.add(Keyarray[0], BorderLayout.NORTH);
  Keypad.add(Keyarray[1], BorderLayout.WEST);
  Keypad.add(Keyarray[2], BorderLayout.SOUTH);
  Keypad.add(Keyarray[3], BorderLayout.EAST);
  Keypad.add(Keyarray[4], BorderLayout.CENTER);

  Keyarray[0].addActionListener(this);
  Keyarray[1].addActionListener(this);
  Keyarray[2].addActionListener(this);
  Keyarray[3].addActionListener(this);
  Keyarray[4].addActionListener(this);

}// end of method init

我希望它有所帮助。

BorderLayout问题。 java，applet

1 个答案: