CODEWITHSUNDEEP
javaswingsizejframe
AlbeyAmakiir
AlbeyAmakiir

Reputation: 2247

How do I make a JFrame a certain size, not including the border?

I have a JFrame that I've set to a certain size, using setBounds. However, that makes the window, including the borders, that size (which in hindsight makes complete sense). But what I want is for the size of the window it be, say, 800x600 plus the borders. This is important because I'm drawing to a Graphics object from the BufferStategy from the JFrame, but I've been drawing underneath the title bar when using a y value of less than about 20. I imagine different OSs (or even different OS settings) can have different thickness borders, too. I thought the borders were just tacked on a window afterwards, but this doesn't seem to be the case.

So, how do I make the space inside the borders a certain size, regardless of the thickness of the borders? Also, to make my life easier, how do I make point 0, 0 be the top left corner of the viewable contents of the frame?

By the way, using setUndecorated presents it's own problems, so I'm not trying that at the moment.

Upvotes: 3

Views: 30505

Answers (6)

Andrew Thompson
Andrew Thompson

Reputation: 168815

  1. Set a preferred size for the content pane.
  2. Pack the frame.
  3. Job done.

E.G.

Fixed Size Content

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

class FixedSizeContent {
    public static void main(String[] args) {
        SwingUtilities.invokeLater( new Runnable() {
            public void run() {
                JFrame f = new JFrame("Fixed size content");
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                Container c = f.getContentPane();
                c.setBackground(Color.YELLOW);
                // adjust to need.
                Dimension d = new Dimension(400,40);
                c.setPreferredSize(d);
                f.setResizable(false);
                f.pack();
                f.setVisible(true);
            }
        });
    }
}

Upvotes: 19

GianniTee
GianniTee

Reputation: 177

Create Canvas canvas = new Canvas();

and add(canvas); to the JFrame,

create canvas.createBufferStrategy(2);

get BufferStrategy bs = canvas.getBufferStrategy();

create Graphics2D graphics2D = (Graphics2D) bufferStrategy.getDrawGraphics();

draw with graphics2D into a BufferedImage.

show it on screen bufferStrategy.show();

Add controls to canvas of all sorts...

try graphics2D.translate(x,y) to move the canvas to certain position measured against the window edges Insets insets...

Upvotes: 0

cPunkt
cPunkt

Reputation: 1

i got a solution for my project. Its quite an old thread, maybe someone wants the code. Try this 

public gfx_CFrame(String _Title, int _Height, int _Width)
{
    super(_Title);

    Dimension Dim = new Dimension(_Width, _Height);

    setMaximumSize(Dim);
    setMinimumSize(Dim);
    setPreferredSize(Dim);
    pack();

    Dim.width  = _Width  + (getWidth()  - getContentPane().getWidth()); 
    Dim.height = _Height + (getHeight() - getContentPane().getHeight());

    setMaximumSize(Dim);
    setMinimumSize(Dim);
    setPreferredSize(Dim);
    pack();
    // ....
}

Upvotes: 0

Sal-laS
Sal-laS

Reputation: 11639

You can use this to avoid using Container. 

JFrame f=new JFrame("Your title");

Dimension d=new Dimension();

d.setSize(x,y);

f.setSize(d);

Upvotes: 2

camickr
camickr

Reputation: 324098

This is important because I'm drawing to a Graphics object from the BufferStategy from the JFrame,

Why are you using a BufferStrategy. That is old AWT code. Swing is double buffered by default.

When doing custom painting in Swing you should extend JPanel (or JComponent) and then override the paintComponent() method. You add this component to the content pane of the frame. Then if you follow kleopatra's advice you won't have a problem.

See the section from the Swing tutorial on Custom Painting for more information and examples.

Upvotes: 6

kleopatra
kleopatra

Reputation: 51524

let the drawing component report the size of the graphic as its pref 

 @Override
 public Dimension getPreferredSize() {
      return new Dimension(myDrawing.getWidth(), myDrawing.getHeight());  
 }

then follow @Andrew's bullets 2 and 3

Upvotes: 7

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