How to completely remove an icon from JDialog?

问题

I am creating a dialog for showing a progress of files' copying. What I want to do is to completely remove dialog's icon image.

I created such kind of dialogs before providing an application's instance of FrameView as an argument for JDialog's constructor like this:

public class MyAppView extends FrameView {

    // ...

    @Action
    public void showOptionsDialog() {

        // Creating modal options' dialog
        JDialog optionsDialog = new JDialog(this, true);

        // ...
    }
}

So, as I can see, I need a parent component to make my dialog with no icon. In my current case (when I have no parent frame view) I tried the following hack method setting a transparent icon but it doesn't work as I expect - I still see an empty area for an icon in dialog's title bar and (what's the worst) I still have a popup window when I click this area.

JFrame dummyFrame = new JFrame();
Image icon = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB_PRE);
dummyFrame.setIconImage(icon);
JDialog myDialog = new JDialog(dummyFrame, true);

Anyway, it must be possible to remove an icon. The working example is JOptionPane:

JOptionPane.showMessage(null, "My message");

Looking at JOptionPane's source code one can find that static Frame JOptionPane.getRootFrame() is used to get a parent for the calls when parent component is set to null:

public static Frame getRootFrame() throws HeadlessException {
    Frame sharedFrame = 
        (Frame)SwingUtilities.appContextGet(sharedFrameKey);
    if (sharedFrame == null) {
        sharedFrame = SwingUtilities.getSharedOwnerFrame();
        SwingUtilities.appContextPut(sharedFrameKey, sharedFrame);
    }
    return sharedFrame;
}

So I've also tried to create my dialog as follows:

JDialog myDialog = new JDialog(JOptionPane.getRootFrame(), true);

but there is still no success. I have a standard Java icon when I try to apply this code snippet.

And my question is: what am I doing wrong? How to completely remove an icon of JDialog as it is done by JOptionPane?

P.S. I use JDK6.

回答1:

The solution is to make a dialog non-resizable and then it will be without an icon with any parent window.

JDialog myDialog = new JDialog(new Frame(), true);
myDialog.setResizable(false);
myDialog.setVisible(true);

Unfortunately, if your dialog is to be resizable there is no way to remove an icon except of setting a transparent icon.

回答2:

Maybe the following is more in the direction you want.

            JProgressBar pb = new JProgressBar();
            JOptionPane op = new JOptionPane(pb, JOptionPane.PLAIN_MESSAGE,
                    JOptionPane.DEFAULT_OPTION);
            JDialog dlg = op.createDialog(MyJFrame.this, "Progress");
            dlg.setVisible(true);

回答3:

In netbeans with design options:

initComponents();
Image img = new BufferedImage(1, 1,BufferedImage.TYPE_INT_ARGB_PRE);
this.setIconImage(img);

回答4:

I have no problem with the icon (though JDK7 on WindowsXP). The popup menu on the icon I suppressed in the dialog with setFocusableWindowState(false).

The JFrame like your code:

public MyJFrame() {
    //URL url = this.getClass().getResource("transparent.gif");
    //if (url != null) {
    //    ImageIcon icon = new ImageIcon(url);
    //    if (icon != null)
    //        setIconImage(icon.getImage());
    //}
    BufferedImage icon = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB_PRE);
    //icon.setRGB(0, 0, 0x00000000);
    setIconImage(icon);
}

and

    JFrame dummyFrame = new MyJFrame();
    JDialog myDialog = new JDialog(dummyFrame, true);
    myDialog.setIconImage(dummyFrame.getIconImage()); // Not needed.
    myDialog.setFocusableWindowState(false);
    myDialog.setVisible(true);

来源：https://stackoverflow.com/questions/8504731/how-to-completely-remove-an-icon-from-jdialog

标签

java

icons

jdialog