[英]Popup for JFrame close button
我正在做一些基本的Java Swing application
(初學者級別)。 我要做的是當我按下close button on JFrame
上的close button on JFrame
來收集窗口我想要一個JOptionPane Confirm Dialog
而不是直接關閉
這是代碼JFrame
JFrame frame= new JFrame("frame");
frame.setSize(300,300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.pack();
和JOptionPane代碼是這樣的
final JOptionPane optionPane = new JOptionPane("Are You sure?",JOptionPane.QUESTION_MESSAGE,
JOptionPane.YES_NO_OPTION);
所以當JFrame上的關閉按鈕按下時,彈出窗口應該出現而不是直接關閉
請指導我如何做到這一點..提前謝謝
是的,您可以使用WindowListener來完成此操作。
public void windowClosed(WindowEvent e) {
//This will only be seen on standard output.
displayMessage("WindowListener method called: windowClosed.");
}
public void windowOpened(WindowEvent e) {
displayMessage("WindowListener method called: windowOpened.");
}
public void windowIconified(WindowEvent e) {
displayMessage("WindowListener method called: windowIconified.");
}
public void windowDeiconified(WindowEvent e) {
displayMessage("WindowListener method called: windowDeiconified.");
}
public void windowActivated(WindowEvent e) {
displayMessage("WindowListener method called: windowActivated.");
}
public void windowDeactivated(WindowEvent e) {
displayMessage("WindowListener method called: windowDeactivated.");
}
public void windowGainedFocus(WindowEvent e) {
displayMessage("WindowFocusListener method called: windowGainedFocus.");
}
public void windowLostFocus(WindowEvent e) {
displayMessage("WindowFocusListener method called: windowLostFocus.");
}
public void windowStateChanged(WindowEvent e) {
displayStateMessage(
"WindowStateListener method called: windowStateChanged.", e);
有關更多詳細信息,請參閱本教程 。
但是對於你的場景,我建議你使用適配器類(因為你只需要一個事件,所以不需要累了並實現所有方法)所以這里有一個根據你的要求的例子
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class NoCloseFrame extends JFrame {
public static void main( String[] arg ) {
new NoCloseFrame();
}
public NoCloseFrame() {
super( "No Close Frame!" );
setDefaultCloseOperation( DO_NOTHING_ON_CLOSE );
setSize( 300, 300 );
setVisible( true );
addWindowListener( new AreYouSure() );
}
private class AreYouSure extends WindowAdapter {
public void windowClosing( WindowEvent e ) {
int option = JOptionPane.showOptionDialog(
NoCloseFrame.this,
"Are you sure you want to quit?",
"Exit Dialog", JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE, null, null,
null );
if( option == JOptionPane.YES_OPTION ) {
System.exit( 0 );
}
}
}
}
您可以按照以下步驟執行此操作:
替換行frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
with frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
實現WindowListener
並覆蓋其所有抽象方法。 你可以在這里找到它 。
以這種方式覆蓋public void windowClosing(WindowEvent e)
方法:
@Override public void windowClosing(WindowEvent e){ int result = JOptionPane.showConfirmDialog(null, "Are you sure,"Confirm",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE); if(result == JOptionPane.YES_OPTION){ System.exit(0); }else{ //Do nothing } }
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