JButton数组，代表卡片，共有16个，4x4的排列方式。如何使用键盘上的箭头浏览JButton，而不是使用鼠标，并且如何通过按下ENTER键来“点击”JButton，而不是使用鼠标单击？也许有其他方法可以代替使用JButton吗？import java.awt.GridLayout;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ButtonPane extends JPanel {
private JButton[][] buttons;
public ButtonPane(int row, int col) {
super(new GridLayout(row, col));
buttons = new JButton[row][col];
for (int i = 0; i < buttons.length; i++) {
for (int j = 0; j < buttons[i].length; j++) {
final int curRow = i;
final int curCol = j;
buttons[i][j] = new JButton(i + ", " + j);
buttons[i][j].addKeyListener(enter);
buttons[i][j].addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_UP:
if (curRow > 0)
buttons[curRow - 1][curCol].requestFocus();
break;
case KeyEvent.VK_DOWN:
if (curRow < buttons.length - 1)
buttons[curRow + 1][curCol].requestFocus();
break;
case KeyEvent.VK_LEFT:
if (curCol > 0)
buttons[curRow][curCol - 1].requestFocus();
break;
case KeyEvent.VK_RIGHT:
if (curCol < buttons[curRow].length - 1)
buttons[curRow][curCol + 1].requestFocus();
break;
default:
break;
}
}
});
add(buttons[i][j]);
}
}
}
private KeyListener enter = new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e) {
if (e.getKeyChar() == KeyEvent.VK_ENTER) {
((JButton) e.getComponent()).doClick();
}
}
};
public static void main(String[] args) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new ButtonPane(4, 4));
f.pack();
f.setVisible(true);
}
}
ButtonPane的类中即可。JButton上调用requestFocus()。我还注册了一个额外的KeyListener来处理按下Enter键的情况。button.addActionListener(yourActionListener);
不需要创建鼠标监听器。
哦，我忘了另一部分。 :D
对于浏览，您可以使用button.requestFocus()将焦点更改到特定按钮。
这里是一些示例代码：
final JButton matrix[][] = new JButton[4][4];
for (int x = 0; x < 4; ++x)
{
for (int y = 0; y < 4; ++y)
{
final int xx = x;
final int yy = y;
JButton b = new JButton();
b.addKeyListener(new KeyAdapter()
{
@Override
public void keyPressed(KeyEvent e)
{
int c = e.getKeyCode();
if (c == KeyEvent.VK_UP)
{
// Oops, corrected (xx > 0) to (yy > 0)
if (yy > 0) matrix[xx][yy-1].requestFocus();
} else if (c == KeyEvent.VK_DOWN)
{
if (yy < 3) matrix[xx][yy+1].requestFocus();
}
// Add the other directions here
}
});
matrix[x][y] = b;
}
}
component[0][0].getInputMap().put(KeyStroke.getKeyStrokeForEvent(KeyEvent.VK_RIGHT),
"moveRight");
component[0][0].getActionMap().put("moveRight", new Action() {
@Override public void actionPerformed() {
component[0][1].requestFocus();
}
});
我不确定代码是否完全正确，但你可以理解思路。 你需要完成36个这样的操作以获取所有按钮之间的方向， 因此你可能需要编写一些循环来自动化该过程。
如何使用操作的部分。JFrame frame = new JFrame();
//pseudo-method to add your buttons to the frame in the appropraite order.
frame.addButtonsToPanel(buttonArray, frame);
//gets the default forward traversal keys (tab)
Set forwardKeys = frame.getFocusTraversalKeys(
KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS);
// your own set of forward traversal keys
Set newForwardKeys = new HashSet(forwardKeys);
// add the RIGHT ARROW key
newForwardKeys.add(KeyStroke.getKeyStroke(
KeyEvent.VK_RIGHT, 0));
//apply your new set of keys
frame.setFocusTraversalKeys(
KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
newForwardKeys);
//gets the default backward traversal keys (shift-tab)
Set backwardKeys = frame.getFocusTraversalKeys(
KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS);
// your own set of backward traversal keys
Set newBackwardKeys = new HashSet(backwardKeys);
// add the LEFT ARROW key
newBackwardKeys.add(KeyStroke.getKeyStroke(
KeyEvent.VK_LEFT, 0));
//apply your new set of keys
frame.setFocusTraversalKeys(
KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,
newBackwardKeys);
附注：有关更多详细信息，请参见如何使用焦点子系统
最近我已将这个小功能加入我的图形用户界面实用工具类。它只是向同一系统添加新的键，该系统执行 [tab] 焦点更改：
public static void addUpDownToTraversalKeys(Component c)
{
addTraversalKeys(c, KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyEvent.VK_DOWN);
addTraversalKeys(c, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyEvent.VK_UP);
}
public static void addLeftRightToTraversalKeys(Component c)
{
addTraversalKeys(c, KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyEvent.VK_RIGHT);
addTraversalKeys(c, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyEvent.VK_LEFT);
}
public static void addTraversalKeys(Component c, int keysetId, int...keyCodes)
{
HashSet<AWTKeyStroke> newKeys =
new HashSet<AWTKeyStroke>(
c.getFocusTraversalKeys(keysetId));
for (int keyCode : keyCodes)
newKeys.add(AWTKeyStroke.getAWTKeyStroke(keyCode, 0));
c.setFocusTraversalKeys(keysetId,newKeys);
}
GuiUtilities.addUpDownToTraversalKeys(this);，在框架的构造函数内使用上下箭头键可以浏览所有元素。请注意，如果您有文本区域，则不建议使用addLeftRightToTraversalKeys() ;)