Java KeyListener不工作
出于某种原因,我的KeyListener对按键事件没有响应 如果重要的话,我在Ubuntu 12.04上。每当按下某个键时,它都应该打印“按键按下”,但实际上没有 代码如下:Java KeyListener不工作,java,swing,awt,keylistener,Java,Swing,Awt,Keylistener,出于某种原因,我的KeyListener对按键事件没有响应 如果重要的话,我在Ubuntu 12.04上。每当按下某个键时,它都应该打印“按键按下”,但实际上没有 代码如下: import java.awt.event.*; import javax.swing.*; import java.awt.Graphics; public class DisplayPanel extends JPanel { private Tile[][] tiles; private Creat
import java.awt.event.*;
import javax.swing.*;
import java.awt.Graphics;
public class DisplayPanel extends JPanel
{
private Tile[][] tiles;
private Creature[] creatures;
private Dungeon dungeon;
private Player player;
public DisplayPanel(Dungeon dungeon, Tile[][] tiles, Creature[] creatures, Player player)
{
this.tiles = tiles;
this.creatures = creatures;
this.dungeon = dungeon;
this.player = player;
addKeyListener(new DungeonKeyListener());
requestFocus();
}
protected void paintComponent(Graphics g)
{
int maximum = (getWidth() < getHeight()) ? getWidth() : getHeight();
for (Tile[] row : tiles)
{
for (Tile tile : row)
{
if (tile != null && tile instanceof Tile)
{
tile.draw(g, maximum/tiles.length, maximum/tiles[0].length);
}
}
}
for (Creature creature : creatures)
{
if (creature != null && creature instanceof Creature)
{
creature.draw(g, maximum/tiles.length, maximum/tiles[0].length);
}
}
if (player != null && player instanceof Player)
{
player.draw(g, maximum/tiles.length, maximum/tiles[0].length);
}
}
private class DungeonKeyListener extends KeyAdapter
{
public void keyReleased(KeyEvent e)
{
System.out.println("Key pressed!");
dungeon.press(e.getKeyCode());
repaint();
}
}
}
导入java.awt.event.*;
导入javax.swing.*;
导入java.awt.Graphics;
公共类DisplayPanel扩展了JPanel
{
私人瓷砖[][]瓷砖;
私人生物[]生物;
私人地牢;
私人玩家;
公共显示面板(地牢地牢,地砖[][]地砖,生物[]生物,玩家)
{
this.tiles=tiles;
这个。生物=生物;
this.dungeon=地牢;
this.player=player;
addKeyListener(新地下城KeyListener());
requestFocus();
}
受保护组件(图形g)
{
int max=(getWidth()
- 调用
(与您的问题无关,但稍后会解决一些问题)super.paintComponent
- 使组件“可聚焦”——
- 在键侦听器上使用
- 在
上使用组件#请求焦点
组件#请求焦点
干杯关于第三点,我们必须使用KeyListeners来完成作业:/
paintComponent
是绘制链中的一个链接。超级版本在保持UI处于一致状态方面做了重要的工作。除非您愿意接管它的职责,否则您应该调用super.paintComponent
此外,super.paintComponent()抛出:DisplayPanel.java:25:javax.swing.JComponent中的paintComponent(java.awt.Graphics)不能应用于()super.paintComponent();^
别忘了传递图形参考;)super.paintComponent(g)
您的面板有焦点吗?您是否尝试将KeyListener添加到根窗口?