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Questions about Applet and JFrame

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Join Date: Oct 2006

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Mr.UNOwen

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Re: Questions about Applet and JFrame

#11

Jan 2nd, 2008

So lets say I want a window in the shape of a circle, I need to have that gray undecorated square window to be transparent such that I can draw a circle such that it looks as though the window is in the shape of a circle. So is there a way to A, get what's displayed behind the window and display it or B, make the gray color be transparent.

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Ezzaral

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Re: Questions about Applet and JFrame

#12

Jan 2nd, 2008

Ah, okay, got it. No, there isn't a straight-forward way to make transparent frames like that. The following article discusses a way to hack that effect though through use of screen shots:
http://www.onjava.com/pub/a/onjava/e...k41/index.html

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Re: Questions about Applet and JFrame

#13

Jan 2nd, 2008

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Originally Posted by Ezzaral

Ah, okay, got it. No, there isn't a straight-forward way to make transparent frames like that. The following article discusses a way to hack that effect though through use of screen shots:
http://www.onjava.com/pub/a/onjava/e...k41/index.html

Crap.... and its even bugy -_-....

I guess I'll just have to wait for Sun to develop one.

Anyway I'm having some trouble trying draw stuff and have components.
If want to not have the screen clear (turn gray) and display those component, how do I go about it?

So lets say I have a TextFeild, a JFrame, and a JPanel which the TextFeild goes into. I extend the JPanel and have main in it where I do the drawing with graphics. How do I go about it.

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Ezzaral

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Re: Questions about Applet and JFrame

#14

Jan 2nd, 2008

Your explanation isn't very clear. Which component do you want to customize the drawing code for? Are you wanting to custom paint the background on the panel, yet not affect the text field?

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Re: Questions about Applet and JFrame

#15

Jan 2nd, 2008

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Are you wanting to custom paint the background on the panel, yet not affect the text field?

Yip

Also I don't want the screen to be cleared every time I change the back ground. So if I change the background, the background is drawn first then the textfeild. Basicaly there's going to be an action listener that will be changing the background over an interval of time.

Last edited by Mr.UNOwen; Jan 2nd, 2008 at 7:43 pm.

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Re: Questions about Applet and JFrame

#16

Jan 2nd, 2008

If you just override paintComponent() for the JPanel, you shouldn't have any problem.

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
new JPanel(){
  public void paintComponent(Graphics g){
    paintPanel(g);
  }
};
new JPanel(){
  public void paintComponent(Graphics g){
    paintPanel(g);
  }
};

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Re: Questions about Applet and JFrame

#17

Jan 3rd, 2008

Thanks
It even worked with paint.

The only issue I'm having now is I need JFrame to always listen to keyboard, but when I add a textfield it's listening only to the textfield. Also my program will be using the keyboard to navigate, so how do I select and deselect a component such that the arrow keys can be listened to and from there move from component to component?

Last edited by Mr.UNOwen; Jan 3rd, 2008 at 12:10 am.

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Re: Questions about Applet and JFrame

#18

Jan 3rd, 2008

I just swiched TextField for JTextFeild and only the back ground or the Jtextfield only depending on whether I override paint (background shows) or PaintComponent(jtextFeild shows).

EDIT:

Never mind, I just had PaintComponent and not paintComponent.

The only issue I'm having now is I need JFrame to always listen to keyboard, but when I add a textfield it's listening only to the textfield. Also my program will be using the keyboard to navigate, so how do I select and deselect a component such that the arrow keys can be listened to and from there move from component to component?

Last edited by Mr.UNOwen; Jan 3rd, 2008 at 12:48 am.

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Re: Questions about Applet and JFrame

#19

Jan 3rd, 2008

Add your key bindings to the JFrame itself like so

 Help with Code Tags 
 java Syntax (Toggle Plain Text) 
JRootPane root = frame.getRootPane();
root.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
  KeyStroke.getKeyStroke(KeyEvent.VK_UP,0),"UpAction");
 
root.getActionMap().put("UpAction",new AbstractAction(){
    public void actionPerformed(java.awt.event.ActionEvent e){
        upAction();
    }
});
JRootPane root = frame.getRootPane();
root.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
  KeyStroke.getKeyStroke(KeyEvent.VK_UP,0),"UpAction");

root.getActionMap().put("UpAction",new AbstractAction(){
    public void actionPerformed(java.awt.event.ActionEvent e){
        upAction();
    }
});