hiding title bar of JInternalFrame? -java

Question

I found some code online, I edited it a bit. I want to hide title bar of a JInternalFrame.

  JInternalFrame frame = new JInternalFrame();
  // Get the title bar and set it to null
  setRootPaneCheckingEnabled(false);
  javax.swing.plaf.InternalFrameUI ifu= frame.getUI();
  ((javax.swing.plaf.basic.BasicInternalFrameUI)ifu).setNorthPane(null);      

  frame.setLocation(i*50+10, i*50+10);
  frame.setSize(200, 150);
  //frame.setBackground(Color.white);      

  frame.setVisible(true);
  desktop.add(frame);

The problem is that the title bar isn't being hidden for some reason. Thanks.

Solution 1

I solved this problem this way: I subclass JInternalFrame and add the following code to its constructor. (I get the subclassing for free because I use netBeans' GUI Builder)

((javax.swing.plaf.basic.BasicInternalFrameUI)this.getUI()).setNorthPane(null);

in your case I think

Solution 2

First convert the internalframe to basicinternalframe.

do it like this:-

BasicInternalFrameUI bi = (BasicInternalFrameUI)your_internalframe_object.getUI();
bi.setNorthPane(null);

After this your title bar will be invisible.

Solution 3

What the others say. Depending on the framework the ui might get updated though, which will make it reappear. So for me it worked initializing the JInternalFrame like this:

        JInternalFrame internalFrame = new JInternalFrame() {
           @Override
           public void setUI(InternalFrameUI ui) {
               super.setUI(ui); // this gets called internally when updating the ui and makes the northPane reappear
               BasicInternalFrameUI frameUI = (BasicInternalFrameUI) getUI(); // so...
               if (frameUI != null) frameUI.setNorthPane(null); // lets get rid of it
           }
        };

Comments

[ThomasG]

Nice, this is the correct answer, unlike .setUI(null)! I also read somewhere that you might need to do this again after certain events (like minimizing the window)

[Parker]

This is the correct answer. It is also useful when combined with frame.setBorder(null); to use a JInternalFrame as a solo component within a top-level JFrame as if it were a JPanel.

[George]

Worked for me. I wasn't even going to try, but works like charm. Thank you.