macOS My JButton Is Hiding Itself

[bobber205]

http://www.alexwait.com/Java/ImageDisplay.jar


Please download that Jar file. So far all it does it add a button to the JFrame.

But there's a weird happening. The button doesn't always appear.
Once in awhile it will appear immediately.
But not often.

But if I immediately press where it should be, it comes up and stays.
I tried putting it "changeButton.setVisible(true)" in, but it didn't help.

Any ideas at all????

The entire code is below.

/**
 * Write a description of class ImageDisplay here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */

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


public class ImageDisplay extends JFrame //implements ActionListener
{
    




ImageDisplay(String title) {
    //super(title);
    
    CreateTheGUI();
    SetWindowListeners();
    
    JFrame mainFrame = new JFrame("Alex");
    mainFrame.setSize(250,301);
    mainFrame.setResizable(false); //don't let the user mess with the window
    mainFrame.setVisible(true);

    Dimension changeButtonD = new Dimension(40,40);
    
    
    JButton changeButton = new JButton("Change Image");
    changeButton.setSize(40,100);
    changeButton.setMaximumSize(changeButtonD);
    changeButton.setToolTipText("main Button this is");
    changeButton.setHorizontalAlignment(SwingConstants.RIGHT);
    changeButton.setVisible(true);
    mainFrame.getContentPane().add(changeButton);
    
    
}




public static void CreateTheGUI() { //just a basic method
    System.out.println("Creating The GUI!(3)"); 
  
}


public static void SetWindowListeners() {





}


public static void main(String[] args) {
    ImageDisplay app = new ImageDisplay("ImageDisplay App");
}






    
}

 

[ldenman]

i don't have a solution, but i can verify that it did the same thing on my machine. Thats pretty weird.

 

[blasto333]

Try This Code

Basically I changed up the style a little, used the JFrame class that you are extending instead of creating a seperate one, moved the setVisiable to the end (that should fix your display problem).

Let me know how it works.

/**
 * Write a description of class ImageDisplay here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */

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


public class ImageDisplay extends JFrame //implements ActionListener
{
    

	public ImageDisplay(String title) 
	{
	    //super(title);
	    
	    CreateTheGUI();
	    SetWindowListeners();
	    
	    this.setSize(250,301);
	    this.setResizable(false); //don't let the user mess with the window
		this.setLayout(null);
		Dimension changeButtonD = new Dimension(40,40);
    
    
 	    JButton changeButton = new JButton("Change Image");
 	    changeButton.setSize(40,100);
 	    changeButton.setMaximumSize(changeButtonD);
 	    changeButton.setToolTipText("main Button this is");
 	    changeButton.setHorizontalAlignment(SwingConstants.RIGHT);
 	    changeButton.setVisible(true);
 	   
 	    this.getContentPane().add(changeButton);
        this.setVisible(true);

    
}




public static void CreateTheGUI() { //just a basic method
    System.out.println("Creating The GUI!(3)"); 
  
}


public static void SetWindowListeners() {





}


public static void main(String[] args) {
    ImageDisplay app = new ImageDisplay("ImageDisplay App");
}






    
}

 

[bobber205]

Yay!

It worked. Thanks so much.
The only thing I had to change was

this.setLayout(null);

to

this.getContentPane().setLayout(null);

But it's working great now.
Thanks again!

 

[bobber205]

How do I make my buttons look like regular Mac OS X buttons?

 

[TrumanApple]

It worked. Thanks so much.
The only thing I had to change was

this.setLayout(null);

to

this.getContentPane().setLayout(null);

But it's working great now.
Thanks again!

be carefull when setting the layout to null, i have had some pretty wierd things happen that were hard to figure out what the problem was.

 

[bobber205]

Maybe you wonderful folks here can explain this to me.

Why when I commented out the setLayout to null line, my button suddenly became as large as the window?

 

[HiRez]

Maybe you wonderful folks here can explain this to me.

Why when I commented out the setLayout to null line, my button suddenly became as large as the window?

It's been a long time since I've done anything in Java, but I assume that not specifically setting a layout probably invokes a default layout mode for the contents (in this case, your button) to fill the available frame.

EDIT: Note that setting the layout to null is not the same as not setting one at all; you would be removing the default one in the case of assigning null.

 

[blasto333]

import java.util.FlowLayout

then do this.getContentPane().setLayout(new FlowLayout());

 

[bobber205]

It worked. Thanks very much.
Have any idea why my button is being centered and not put on the right?

 

[blasto333]

You could do
this.getContentPane().setLayout(new FlowLayout(FlowLayout.RIGHT));