Flashing JFrame

**ilyvatar** · 11-30-2010, 10:02 AM

Hi,

I would like to create a JFrame with two specifal features:

1. JFrame should not grab focus while maximized from minimized state.
2. When a JFrame created or became maximized from minimized state, it should flash in the Windows bar until a user will grant a focus to it. (like as in ICQ clients

).
Does anybody know how the second requirement can be implemented?

Little self-explained example:

Java Code:

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class JFrameTest {
    private static JFrame childFrame;
    public static Container getParentContentPane() {
        JPanel panel = new JPanel();
        JButton button = new JButton("Create\\Restore child frame");
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                createOrRestoreChildFrame();
            }
        });
        panel.add(button);
        return panel;
    }

    private static void createOrRestoreChildFrame() {
        if (childFrame == null) {
            childFrame = new JFrame("Child Frame");
            childFrame.setLocation(200, 200);
            childFrame.add(new JLabel("Child Frame"));
            childFrame.pack();
            setChildFrameVisible();
        } else {
            setChildFrameVisible();
        }
    }

    private static void setChildFrameVisible() {
        childFrame.setFocusableWindowState(false);
        childFrame.setVisible(true);
        flashInWindowsBar(childFrame);
        childFrame.toFront();
        childFrame.setFocusableWindowState(true);
    }

    /**
     * Should Make child frame flash in Windows bar.
     * Currently, it does not work for me.
     * Could anybody help me to fix this please? ) 
     */
    private static void flashInWindowsBar(JFrame childFrame) {
        childFrame.setState(JFrame.ICONIFIED);
        childFrame.toFront();
    }

    private static void createAndShowGUI() {
        JFrame parentFrame = new JFrame("JFrame Demo");
        parentFrame.setLocation(100, 100);
        parentFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        parentFrame.setContentPane(getParentContentPane());
        parentFrame.pack();
        parentFrame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

Thanks!

**travishein** · 11-30-2010, 06:30 PM

I have seen this before using a native library and JNI. where this means it is specific to windows, and even the 32 or 64 bit flavor of windows for which the DLL was compiled on.

see also: 1 2