在网格面板内使用键盘箭头移动 JButton [英] Move JButton with keyboard Arrows inside a Grid Panel
问题描述
我想制作一个可以在网格面板内用键盘箭头移动的 JButton.关于如何做到这一点的任何想法?
i want to make a JButton that can be moved with keyboard arrows inside a grid panel. Any ideas on how to make this happen ?
这是我到目前为止所做的,但它并没有真正起作用
Here is what i have done so far, but it does not really works
button.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
System.out.println("KEY ^$$#$#$@#$ " + key);
int position = 0;
int previousPosition = 0;
int counter = 0;
position = Integer.parseInt(button.getName());
int nextPosition = position;
if (key == KeyEvent.VK_LEFT) {
nextPosition = nextPosition - 1;
previousPosition = position;
System.out.println("PREVIOUS POSITION: " + position);
bt[1].setVisible(false);
System.out.println("POSITION: " + position);
button.setName("" + nextPosition);
bt[nextPosition].add(button);
}
else if (key == KeyEvent.VK_DOWN) {
counter++;
if (counter == 1) {
nextPosition = nextPosition + 6;
}
else if (counter == 2) {
nextPosition = nextPosition + 12;
}
else {
nextPosition = 18;
}
System.out.println("next position:" + nextPosition);
System.out.println("counter: " + counter);
System.out.println("DOWN ARROW");
System.out.println("DOWN ARROW");
System.out.println("POSITION VALUE: " + nextPosition);
bt[previousPosition].setVisible(false);
System.out.println("POSITION: " + nextPosition);
button.setName("" + nextPosition);
bt[nextPosition].add(button);
System.out.println("end");
}
}
@Override
public void keyReleased(KeyEvent e) {
}
});
感谢您的帮助
推荐答案
嗯,这取决于.
无论如何,我建议使用键绑定 超过 KeyListener
,因为它没有焦点问题.
I would, how ever, recommend using Key Bindings over KeyListener
as it doesn't suffer from focus issues.
这基本上使用 GridLayout
并简单地更改按钮的 z 顺序...
This basically use a GridLayout
and simply changes the z-order of the button...
您可以使用 GridBagLayout
实现类似的效果,但需要做更多的工作,但这会导致更灵活的布局
You could achieve something similar with GridBagLayout
with a little more work, but which would result in more flexible layout
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.LineBorder;
public class MoveButtons {
public static void main(String[] args) {
new MoveButtons();
}
public MoveButtons() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JButton button;
public TestPane() {
setLayout(new GridLayout(4, 4));
button = new JButton("...");
add(button);
for (int index = 0; index < (4 * 4) - 1; index++) {
JPanel panel = new JPanel();
panel.setBorder(new LineBorder(Color.GRAY));
add(panel);
}
requestFocus();
InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
ActionMap am = getActionMap();
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), "left");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), "right");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0), "up");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0), "down");
am.put("left", new MoveAction(-1));
am.put("right", new MoveAction(1));
am.put("down", new MoveAction(4));
am.put("up", new MoveAction(-4));
}
public class MoveAction extends AbstractAction {
private int delta;
public MoveAction(int delta) {
this.delta = delta;
}
@Override
public void actionPerformed(ActionEvent e) {
int index = getComponentZOrder(button);
index += delta;
if (index < 0) {
index = 0;
} else if (index >= getComponentCount()) {
index = getComponentCount() - 1;
}
setComponentZOrder(button, index);
revalidate();
}
}
}
}
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