🚀 go-pugleaf

I solved this problem by overriding the getPreferredSize function.

 public Dimension getPreferredSize(){
    return new Dimension(img.getWidth(null), img.getHeight(null));
  }

This can not be solved by setting the canvas size!

Qiang Song wrote:

> Following is a very short testing code. There is no scrollbar with
> JScrollPane ! Same thing with ScrollPane. Help is wanted and
> aprreciated!
>
> import java.awt.*;
> import java.awt.image.*;
> import javax.swing.*;
>
> public class myFrame extends JFrame {
>  JScrollPane scrollPane;
>  myCanvas c;
>  public myFrame(){
>   c = new myCanvas();
>   scrollPane = new JScrollPane(c);
>   this.getContentPane().add(scrollPane);
>  }
>
>  public static void main(String args[]){
>   myFrame f = new myFrame();
>   f.setSize(200, 300);
>   f.setVisible(true);
>  }
> }
>
> class myCanvas extends Canvas{
>  Image img;
>
>  public myCanvas(){
>   //you may change image to your own
>   img = Toolkit.getDefaultToolkit().getImage("AboutSwing.gif");
>  }
>
>  public void paint(Graphics g){
>   g.drawImage(img, 0, 0, this);
>  }
> }