设置JDialog相对于JFrame的位置 [英] Set location of JDialog relative to JFrame
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问题描述
有没有办法设置相对于 JFrame
的对话框位置?
Is there a way to set a dialog location relative to a JFrame
?
我想将对话框置于包含GUI的框架中,而对话框通常出现在屏幕中央而不是GUI内。
I would like to center the dialog to the frame that houses my GUI, instead the dialog often appears in the center of the screen rather than within the GUI.
推荐答案
有没有办法相对于另一个JFrame设置位置
Is there a way to set a location relative to another JFrame
您可以:
- 传递
JFrame
作为 JDialog.setLocationRelativeTo(Component c) - 设置为所需
点
来自JFrame
到 JDialog.setLocation(Point p)
- pass
JFrame
as argument for JDialog.setLocationRelativeTo(Component c) - set to desired
Point
fromJFrame
to JDialog.setLocation(Point p)
编辑
所有Swing代码必须在 EventDispatchThread上完成,意味着 setVisible(true)
应该包含在 invokeLater
all Swing code must be done on EventDispatchThread, meaning that setVisible(true)
should be wrapped into invokeLater
EDIT2
当使用JFrame作为组件c我得到一个找不到符号错误
when using the JFrame as Component c I am getting a cannot find symbol error
不可能,一些小错误
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class ClosingFrameDialog extends JFrame {
private JFrame frame = new JFrame();
private static final long serialVersionUID = 1L;
private JMenuBar MenuBar;
private JMenu File;
private JMenuItem Exit;
private JMenuItem ShowDialog;
private JDialog dialog;
private Point location;
public ClosingFrameDialog() {
Exit = new JMenuItem(" Exit ");
Exit.addActionListener(new ExitListener());
ShowDialog = new JMenuItem(" Show Dialog ");
ShowDialog.addActionListener(showingDialog());
File = new JMenu(" File ");
File.add(Exit);
File.add(ShowDialog);
MenuBar = new JMenuBar();
MenuBar.add(File);
frame.addWindowListener(exitListener);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setJMenuBar(MenuBar);
frame.setPreferredSize(new Dimension(400, 300));
frame.setLocation(100, 100);
frame.pack();
frame.setVisible(true);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createDialog();
}
});
}
private void createDialog() {
JButton btn = new JButton(" Save changes ");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//some stuff for saving whatewer programatically
dialog.setVisible(false);
}
});
JButton btn1 = new JButton(" Ignore changes ");
btn1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dialog.setLocationRelativeTo(frame);
dialog.setVisible(false);
}
});
dialog = new JDialog();
dialog.add(btn);
dialog.add(btn1);
dialog.setVisible(false);
dialog.setAlwaysOnTop(true);
dialog.setModal(true);
dialog.setLayout(new GridLayout(2, 0, 10, 10));
JPanel pane = (JPanel) dialog.getContentPane();
pane.setBorder(new EmptyBorder(10, 10, 10, 10));
dialog.addWindowListener(closeListener);
dialog.pack();
}
//
private WindowListener exitListener = new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,
"Are You Sure to Close this Application?",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == 0) {
System.exit(1);
}
}
@Override
public void windowIconified(WindowEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,
"Are You Sure to Close this Application?",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == 0) {
//System.exit(1);
}
}
};
//
private WindowListener closeListener = new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
int confirm = JOptionPane.showOptionDialog(dialog,
"Are you want to save changes",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == 0) {
//some stuff for saving whatewer programatically
dialog.setVisible(true);
} else if (confirm == 1) {// nothing only hide JDialog
dialog.setVisible(true);
}
}
};
private Action showingDialog() {
return new AbstractAction("Show Dialog") {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
Runnable doRun = new Runnable() {
@Override
public void run() {
dialog.setVisible(false);
location = frame.getLocationOnScreen();
int x = location.x;
int y = location.y;
//dialog.setLocation(x, y);
dialog.setLocationRelativeTo(frame);
dialog.setVisible(true);
}
};
SwingUtilities.invokeLater(doRun);
}
};
}
private class ExitListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,
"Are You Sure to Close this Application?",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == 0) {
System.exit(1);
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
ClosingFrameDialog cf = new ClosingFrameDialog();
}
});
}
}
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