Question

这是我创建图形文本的内部类。我希望能够按箭头键让它消失。我确定它以某种方式涉及删除方法，但我在我的脑海中。非常新的。

// STARTUP TEXT

class TextPanel extends JPanel implements KeyListener{

    // CONSTRUCTOR
    public TextPanel(){
        addKeyListener(this);
        setFocusable(true);
        setFocusTraversalKeysEnabled(false);
    }

    // PAINT METHOD
    public void paintComponent(Graphics g2){
        super.paintComponent(g2);
        g2.setColor(Color.WHITE);
        g2.fillRect(0, 0, this.getWidth(), this.getHeight());
        g2.setColor(Color.BLACK);
        g2.setFont(new Font("TimesRoman", Font.PLAIN, 14));
        g2.drawString("Press an arrow key to start", this.getWidth()/4, this.getHeight()/2);
    }

Answer 1

AFAIK您必须使用Key Bindings来回复箭头键然后删除面板（我想从框架中）使用面板的setVisible(false)或框架的remove(component)方法。

Answer 2

/** Handle the key typed event  */
    public void keyTyped(KeyEvent e) {

    }

    /** Handle the key-pressed event  */
    public void keyPressed(KeyEvent e) {

    }

    /** Handle the key-released event  */
    public void keyReleased(KeyEvent e) {
    int key=e.getKeyCode();
        if(key==KeyEvent.VK_LEFT)
        {

            this.setVisible(false);

        }
        if(key==KeyEvent.VK_RIGHT)
        {

            this.setVisible(true);

        }

    }

Java：如何通过单击箭头键来删除特定的JPanel？

2 个答案: