swing鼠标悬停_swing搞了老半天，总是要鼠标经过才显示按钮

swing弄了老半天&＃xff0c;总是要鼠标经过才显示按钮

本帖最后由 walkuere 于 2014-07-26 17:11:09 编辑

按了按钮后&＃xff0c;画面切换&＃xff0c;总是要鼠标经过&＃xff0c;这个图像才显示。。。

Class Game extends JPanel

{

//主类

public static launch_Satellite toppanel;

public void repaint_manual()

{

this.add(toppanel);

toppanel.setVisible(true);

//   this.validate();

}

}

//别的类里的触发

public void actionPerformed(ActionEvent e)

{

Game.toppanel&＃61;new launch_Satellite(...);

Game.repaint_manual();

}

public Class launch_Satellite extends JPanel

{

this.setLayout(null);

cardbtn1&＃61;new Cardbtn(n);

cardbtn1.setBounds(x,y,width,height);

cardbtn1.setVisible(true);

this.add(cardbtn1);

this.setBounds(x,y,width,height);

this.setVisible(true);

Game.toppanel.add(this);

}

public Class Cardbtn extends JPanel

{

this.setLayout(null);

CardImg cardimg;

cardimg.setBounds(0, 0, width, height);

this.setSize(width, height);

this.add(cardimg);

cardimg.setVisible(true);

}

public Cardimg extends JButton

{

}

------解决方案--------------------

我之前也遇到过这个问题。。。。

------解决方案--------------------

加上repaint&＃xff0c;不然界面不会更新&＃xff0c;你鼠标经过时触发了repaint才会更新界面&＃xff0c;另外加上validate是可以的&＃xff0c;因为界面布局可能发生变化

public void repaint_manual() {

this.add(toppanel);

toppanel.setVisible(true);

this.validate();

this.repaint();

}