java keyadapter_使用KeyAdapter的简单程序无法在按下多个按键后注册单个按键。代码解决方案？...

叁歲伎倆 2022-11-11 14:46 50阅读 0赞

小编典典

正如在类似问题中所讨论的，不要使用KeyListener，而要使用键绑定。摆动计时器可用于重复移动精灵。

编辑

例如：

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.event.\*;

import java.util.EnumMap;

import javax.swing.\*;

@SuppressWarnings("serial")

public class Boxxy2 extends JPanel \{

private static final int PREF\_W = 400;

private static final int PREF\_H = PREF\_W;

private static final int SQUARE\_W = 20;

private static final String PRESSED = "pressed";

private static final String RELEASED = "released";

public static final int MOVE\_SCALE = 1;

private static final int TIMER\_DELAY = 5;

private int squareX = 0;

private int squareY = 0;

private int squareW = SQUARE\_W;

private int squareH = SQUARE\_W;

private EnumMap dirMap = new EnumMap<>(Direction.class);

public Boxxy2() \{

setupKeyBinding();

new Timer(TIMER\_DELAY, new TimerListener()).start();

private void setupKeyBinding() \{

int condition = JComponent.WHEN\_IN\_FOCUSED\_WINDOW;

InputMap inMap = getInputMap(condition);

ActionMap actMap = getActionMap();

// this uses an enum of Direction that holds ints for the arrow keys

for (Direction direction : Direction.values()) \{

dirMap.put(direction, Boolean.FALSE);

int key = direction.getKey();

String name = direction.name();

KeyStroke keyPressed = KeyStroke.getKeyStroke(key, 0, false);

KeyStroke keyReleased = KeyStroke.getKeyStroke(key, 0, true);

// add the key bindings for arrow key and shift-arrow key

inMap.put(keyPressed, name + PRESSED);

inMap.put(keyReleased, name + RELEASED);

actMap.put(name + PRESSED, new MyKeyAction(this, direction, true));

actMap.put(name + RELEASED, new MyKeyAction(this, direction, false));

@Override

public Dimension getPreferredSize() \{

return new Dimension(PREF\_W, PREF\_H);

@Override

protected void paintComponent(Graphics g) \{

super.paintComponent(g);

g.setColor(Color.RED);

g.fillRect(squareX, squareY, squareW, squareH);

private static void createAndShowGui() \{

Boxxy2 mainPanel = new Boxxy2();

JFrame frame = new JFrame("Boxxy2");

frame.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);

frame.getContentPane().add(mainPanel);

frame.pack();

frame.setLocationByPlatform(true);

frame.setVisible(true);

public static void main(String\[\] args) \{

SwingUtilities.invokeLater(new Runnable() \{

public void run() \{

createAndShowGui();

\});

private class TimerListener implements ActionListener \{

@Override

public void actionPerformed(ActionEvent e) \{

for (Direction dir : dirMap.keySet()) \{

if (dirMap.get(dir)) \{

squareX += MOVE\_SCALE \* dir.getRight();

squareY += MOVE\_SCALE \* dir.getDown();

repaint();

public void setMovement(Direction direction, boolean keyPressed) \{

dirMap.put(direction, keyPressed);

enum Direction \{

UP(KeyEvent.VK\_UP, 0, -1), DOWN(KeyEvent.VK\_DOWN, 0, 1), LEFT(KeyEvent.VK\_LEFT, -1, 0), RIGHT(KeyEvent.VK\_RIGHT, 1, 0);

private int key;

private int right;

private int down;

private Direction(int key, int right, int down) \{

this.key = key;

this.right = right;

this.down = down;

public int getKey() \{

return key;

public int getRight() \{

return right;

public int getDown() \{

return down;

// Actions for the key binding

@SuppressWarnings("serial")

class MyKeyAction extends AbstractAction \{

private Boxxy2 boxxy2;

private Direction direction;

private boolean keyPressed;

public MyKeyAction(Boxxy2 boxxy2, Direction direction, boolean keyPressed) \{

this.boxxy2 = boxxy2;

this.direction = direction;

this.keyPressed = keyPressed;

@Override

public void actionPerformed(ActionEvent e) \{

boxxy2.setMovement(direction, keyPressed);

2020-09-28

java keyadapter_使用KeyAdapter的简单程序无法在按下多个按键后注册单个按键。代码解决方案？...

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