Hi,



I have a Canvas inside a Scrollpane. I want to increase the size of the canvas, when a certain event occurs, but even though the Canvas size increases, which I double check using "System.out.println("--> " + c.getSize());", but the scrollbar of the Scrollpane remains unchanged. Hence, it is as if the size of the canvas didn't change, even though I can see in the "System.out.println("--> " + c.getSize());" statement that the Canvas size has changed.



Hence, the problem is that the Scrollpane is not detecting that the Canvas size has increased.



Thanx in advance.



-------------------------------SAKIB





The following is my code (NB. Clicking on the button (@ West) increases the size of the Canvas.):-

			

			package client;
			

			

			import java.applet.*;
			

			import java.awt.*;
			

			import java.awt.event.*;
			

			import java.util.*;
			

			

			public class CanvasScroll extends Applet {
			

			Canvas c;
			

			ScrollPane s;
			

			

			private BorderLayout borderLayout1 = new BorderLayout();
			

			private Button button1 = new Button();
			

			Vector vect = new Vector();
			

			

			int canvasWidth = 75, canvasHeight = 400;
			

			

			//double buffering PART-1
			

			Image myOffScreenImage;
			

			Graphics myOffScreenGraphics;
			

			

			//double buffering PART-2 & 3 together
			

			public void update(Graphics g){
			

			myOffScreenImage = createImage(getSize().width, getSize().height);
			

			myOffScreenGraphics = myOffScreenImage.getGraphics();
			

			

			paint(myOffScreenGraphics);
			

			g.drawImage(myOffScreenImage, 0, 0, this);
			

			}
			

			public void init() {
			

			setLayout(new BorderLayout());
			

			s = new ScrollPane();
			

			s.setSize(100,100);
			

			add("Center", s);
			

			c = new myCanvas();
			

			c.setSize(canvasWidth,canvasHeight);//no horizontal scrollbar's//75, 400
			

			s.add(c);
			

			

			button1.setLabel("button1");
			

			button1.addActionListener(new java.awt.event.ActionListener() {
			

			public void actionPerformed(ActionEvent e) {
			

			button1_actionPerformed(e);
			

			}
			

			});
			

			

			this.add(button1, BorderLayout.WEST);
			

			}
			

			

			class myCanvas extends Canvas {
			

			

			//double buffering PART-1
			

			Image myOffScreenImage;
			

			Graphics myOffScreenGraphics;
			

			

			//double buffering PART-2 & 3 together
			

			public void update(Graphics g){
			

			myOffScreenImage = createImage(getSize().width, getSize().height);
			

			myOffScreenGraphics = myOffScreenImage.getGraphics();
			

			

			paint(myOffScreenGraphics);
			

			g.drawImage(myOffScreenImage, 0, 0, this);
			

			}
			

			

			public myCanvas(){ super(); }
			

			

			public void paint(Graphics g){
			

			int x = 10, y = 10, y_diff = 20;
			

			g.drawString("Hello World = " + y, x, y); y += y_diff;
			

			g.drawString("Hello World = " + y, x, y); y += y_diff;
			

			g.drawString("Hello World = " + y, x, y); y += y_diff;
			

			g.drawString("Hello World = " + y, x, y); y += y_diff;
			

			g.drawString("Hello World = " + y, x, y); y += y_diff;
			

			g.drawString("Hello World = " + y, x, y); y += y_diff;
			

			

			for(int i = 0; i
			< vect.size(); i++){
			

			g.drawString((String) vect.elementAt(i), x, y); y += y_diff;
			

			}
			

			}
			

			}
			

			

			public CanvasScroll(){
			

			try{
			

			jbInit();
			

			}
			

			catch(Exception e) {
			

			e.printStackTrace();
			

			}
			

			}
			

			private void jbInit() throws Exception{}
			

			

			public void button1_actionPerformed(ActionEvent e){
			

			vect.addElement("Hello World !!!");
			

			canvasHeight += 20;
			

			c.setSize(canvasWidth, canvasHeight);
			

			System.out.println("--> " + c.getSize());
			

			}
			

			}