java 向 JDialog 添加按钮？
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Adding buttons to a JDialog?
提问by Stan
I'm trying to make a JButton on a JDialog, but, the button will cover the entire JDialog, any help on this? This is what it looks like:
我正在尝试在 JDialog 上创建一个 JButton，但是，该按钮将覆盖整个 JDialog，对此有什么帮助吗？这是它的样子：
This is how I create the JDialog and the JButton:
这就是我创建 JDialog 和 JButton 的方式：
class MenuStoreHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth = (int) dim.getWidth();
int screenHeight = (int) dim.getHeight();
JDialog g = new JDialog();
g.setTitle("The Store");
g.setSize(200, 200);
g.setLocation(screenWidth / 2 - 150, screenHeight / 2 - 150);
JButton b = new JButton("Buy");
b.addActionListener( new StoreItem1Handler() );
b.setVisible(true);
g.add(b);
g.setVisible(true);
}
}
I'm just going to post my full MrStan.class, here it is:
我只是要发布我完整的 MrStan.class，这里是：
package Progress;
public class MrStan extends JPanel{
private Timer timer = new Timer();
public static int points;
static File h = new File("text.txt");
public ImageIcon bg = new ImageIcon("D:/MrStan/bg.png");
static JMenuBar menubar;
Formatter x;
JMenu menu;
JMenuItem menuitem;
double version = 0.3;
class todoTask extends TimerTask{
public void run(){
points += 1;
repaint();
}
}
public int getPoints(){
return points;
}
public void setPoints( int points ){
this.points = points;
}
public MrStan(){
setIgnoreRepaint(true);
menubar = new JMenuBar();
menu = new JMenu("Menu");
menu.setMnemonic(KeyEvent.VK_F);
menu.getAccessibleContext().setAccessibleDescription("Menu");
menubar.add(menu);
menuitem = new JMenuItem("Store (S)", new ImageIcon("coins.png"));
menuitem.setMnemonic(KeyEvent.VK_S);
menuitem.addActionListener( new MenuStoreHandler() );
menu.add(menuitem);
menuitem = new JMenuItem("Reset Points (R)", new ImageIcon("delete.png"));
menuitem.setMnemonic(KeyEvent.VK_R);
menuitem.addActionListener( new MenuResetPointHandler() );
menu.add(menuitem);
// add a separator
menu.addSeparator();
menuitem = new JMenuItem("Exit (E)", new ImageIcon("cross.png"));
menuitem.setMnemonic(KeyEvent.VK_E);
menuitem.addActionListener( new MenuExitHandler() );
menu.add(menuitem);
timer.schedule(new todoTask(), 0, 2000);
}
class MenuStoreHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth = (int) dim.getWidth();
int screenHeight = (int) dim.getHeight();
JDialog g = new JDialog();
g.setTitle("The Store");
g.setSize(200, 200);
g.setLocation(screenWidth / 2 - 150, screenHeight / 2 - 150);
JButton b = new JButton("Buy");
b.addActionListener( new StoreItem1Handler() );
b.setVisible(true);
g.add(b);
g.setVisible(true);
}
}
class StoreItem1Handler implements ActionListener{
public void actionPerformed(ActionEvent e){
System.out.println("Store-Button 1 pressed.");
}
}
class MenuExitHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
System.exit(1);
}
}
class MenuResetPointHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
points = 0;
repaint();
JOptionPane.showMessageDialog(null, "Points have been reset.");
}
}
public void paint(Graphics g){
g.setColor(Color.WHITE);
bg.paintIcon(this,g,0,0);
g.setColor(Color.BLACK);
g.drawString("Points: " + points, 75, 95);
g.drawString("Version: " + version, 2, 10);
}
public static void main(String[] args){
final MrStanCreateFile g = new MrStanCreateFile();
Runtime.getRuntime().addShutdownHook(new Thread(new Runnable(){
public void run(){
if(h.exists()){
g.openFile();
g.addRecords();
g.closeFile();
}else{
System.out.println(h.getName() + "does not exist, not saving.");
}
}
}, "Shutdown-thread"));
readIt();
//Create new JFrame
JFrame frame = new JFrame();
frame.setTitle("MrStan");
frame.setSize(200, 200);
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.setJMenuBar(menubar);
//Set location of JFrame
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth = (int) dim.getWidth();
int screenHeight = (int) dim.getHeight();
frame.setLocation(screenWidth / 2 - 200, screenHeight / 2 - 200);
//Set ContentPane to JPanel
MrStan panel = new MrStan();
frame.setContentPane(panel);
//Make the user not be able to resize
frame.setResizable(false);
//Make the JFrame visible
frame.setVisible(true);
}
public static void readIt(){
MrStanReadFile r = new MrStanReadFile();
r.openFile();
r.readFile();
r.closeFile();
}
}
Why is this covering my ENTIRE JDialog? I'm using the basic Layout Manager, it should just be fine.
为什么这覆盖了我的整个 JDialog？我正在使用基本的布局管理器，应该没问题。
回答by Bala R
Seems to work fine for me. Did you do call setLayout(null) for the dialog?
对我来说似乎工作正常。您是否为对话框调用了 setLayout(null) ？
This is what I tried
这是我试过的
JDialog dialog = new JDialog();
dialog.setSize(300, 200);
dialog.setLayout(null);
JButton button = new JButton("Testbutton!");
button.setVisible(true);
button.setBounds(10,10,40,40);
dialog.add(button);
//Make dialog visible
dialog.setVisible(true);
And usually it's not a good practice to not use a layout manager. Things can get complicated very quickly. Layout Managers help a lot.
通常不使用布局管理器不是一个好习惯。事情会很快变得复杂。布局管理器有很大帮助。
回答by Anthony Accioly
Try adding the button to the contentPane first and setting the bounds later.
尝试先将按钮添加到 contentPane，然后再设置边界。
Container pane = dialog.getContentPane();
pane.setLayout(null);
JButton button = new JButton("Testbutton!");
pane.add(button);
button.setBounds(10,10,40,40);
回答by camickr
The real problem for you code is that you add the components to the dialog AFTER you set the dialog visible. The second setVisible() does nothing because its already visible.
您代码的真正问题是在将对话框设置为可见后将组件添加到对话框中。第二个 setVisible() 什么都不做，因为它已经可见。
That is why you should be learning from the examples in the Swing tutorial. The examples show you the proper way to create a simple GUI.
这就是为什么您应该从 Swing 教程中的示例中学习的原因。这些示例向您展示了创建简单 GUI 的正确方法。
