可以说,我们有几个JFrame窗口同时可见,并且每个窗口都出现JDialog.当我们的窗口处于级联模式和对话框setAlwaysOnTop为真时,所有对话框将在最后一个窗口中可见.

我只想将Dialog组件与其所有者关联起来,这样当你在Frames之间切换时,你只会在顶部获得一个对话框,并且在单击一个框架时不会丢失该对话框.

对话框有这样的构造函数：

setAlwaysOnTop(true);

setModal(false);

提前致谢！

解决方法:

How to make JDialog onTop only for his parent?

> setParent in the constructor properly

>必须使用setModalityType f.e. ModalityType.DOCUMENT_MODAL ModalityType.APPLICATION_MODAL而不是setModal

> setModal对初始化/是此JDialog的父级的容器有效

>不要使用多个JFrame,而是使用JDialog,将此容器重新用于其他操作

例如

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class SuperConstructor extends JFrame {

private static final long serialVersionUID = 1L;

public SuperConstructor() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setPreferredSize(new Dimension(300, 300));

setTitle("Super constructor");

Container cp = getContentPane();

JButton b = new JButton("Show dialog");

b.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent evt) {

FirstDialog firstDialog = new FirstDialog(SuperConstructor.this);

}

});

cp.add(b, BorderLayout.SOUTH);

JButton bClose = new JButton("Close");

bClose.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent evt) {

System.exit(0);

}

});

add(bClose, BorderLayout.NORTH);

pack();

setVisible(true);

}

public static void main(String args[]) {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

SuperConstructor superConstructor = new SuperConstructor();

}

});

}

private class FirstDialog extends JDialog {

private static final long serialVersionUID = 1L;

FirstDialog(final Frame parent) {

super(parent, "FirstDialog");

setPreferredSize(new Dimension(200, 200));

setLocationRelativeTo(parent);

setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);

setModalityType(Dialog.ModalityType.APPLICATION_MODAL);

JButton bNext = new JButton("Show next dialog");

bNext.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent evt) {

SecondDialog secondDialog = new SecondDialog(parent, false);

}

});

add(bNext, BorderLayout.NORTH);

JButton bClose = new JButton("Close");

bClose.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent evt) {

setVisible(false);

}

});

add(bClose, BorderLayout.SOUTH);

pack();

setVisible(true);

}

}

private int i;

private class SecondDialog extends JDialog {

private static final long serialVersionUID = 1L;

SecondDialog(final Frame parent, boolean modal) {

//super(parent); // Makes this dialog unfocusable as long as FirstDialog is visible

setPreferredSize(new Dimension(200, 200));

setLocation(300, 50);

setModal(modal);

setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);

setTitle("SecondDialog " + (i++));

setModalityType(Dialog.ModalityType.APPLICATION_MODAL);

JButton bClose = new JButton("Close");

bClose.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent evt) {

setVisible(false);

}

});

add(bClose, BorderLayout.SOUTH);

pack();

setVisible(true);

}

}

}

标签：java,modal-dialog,swing,jdialog

来源： https://codeday.me/bug/20190529/1179407.html