可以說,我們有幾個JFrame窗口同時可見,并且每個窗口都出現JDialog.當我們的窗口處于級聯模式和對話框setAlwaysOnTop為真時,所有對話框將在最后一個窗口中可見.

我只想將Dialog組件與其所有者關聯起來,這樣當你在Frames之間切換時,你只會在頂部獲得一個對話框,并且在單擊一個框架時不會丟失該對話框.

對話框有這樣的構造函數：

setAlwaysOnTop(true);

setModal(false);

提前致謝！

解決方法:

How to make JDialog onTop only for his parent?

> setParent in the constructor properly

>必須使用setModalityType f.e. ModalityType.DOCUMENT_MODAL ModalityType.APPLICATION_MODAL而不是setModal

> setModal對初始化/是此JDialog的父級的容器有效

>不要使用多個JFrame,而是使用JDialog,將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);

}

}

}

標簽：java,modal-dialog,swing,jdialog

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

總結

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