Question

Wait for JFrame to create

Asked by: GMSDev

I have an application where I need to create a JFrame and then wait for it to fully create so I can access the Graphics element.  When I call the setVisible function, the frame does create right away but the getGraphics function returns null until I exit the calling function.  Is there a way to wait while I am in the calling function for the frame to complete?  Here is a sample of what I am describing.

public class Main {
 
    public static void main(String[] args) {
        Graphics g;
 
        TestWindow win = new TestWindow();
        win.setSize(400, 600);
        win.setVisible(true);
 
        while (win.getGraphics() != null) {
 
        }
 
        //We won't get here
        win.setTitle("Test Window");
        g = win.getGraphics();
    }
 
}
 
public class TestWindow extends JFrame {
 
    public TestWindow() {
 
    }
}

                                  
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Asked On
2009-08-22 at 22:42:01ID24674331
Tags

Java

Topics

Java 2 Micro-Edition (J2ME)

,

NetBeans IDE

,

Java AWT & Swing

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: spulePosted on 2009-08-23 at 00:43:44ID: 25161685

//You should do this:
while (win.getGraphics() == null) {}
 
//But this is better:
win.addWindowListener(new WindowAdapter(){
    public void windowOpened(WindowEvent e){
       Graphics g = win.getGraphics();
    }
}

                                              
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by: spulePosted on 2009-08-23 at 00:48:42ID: 25161695

But you shouldn't draw on a JFrame like this. It may appear OK at first but when the window decides to repaint, your drawing disappears. The proper way of doing this is overriding the paint() method of your window:

public class TestWindow extends JFrame {
 
    public TestWindow() {
 
    }
 
    public void paint(Graphics g){
        //the graphics of this window was passed as a parameter, now do your drawing
    }
}

                                              
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