Canvas repainting in web migration

HI,
We are attempting to migrate our forms to the web. In several cases, we experience intermittent screen re-paints. I have made sure that we have Visible=NO and Raise on entry = yes specified for all but the first canvas. (All of these forms have multiple canvases - some as many as 20 canvases per form!)
In one particular case, I press a button to launch a LOV, then press a button to close the LOV. Sometimes the repaints happen before the LOV is displayed, other times, the repaints occur after closing.
This is a frustrating issue - if it was consistent, it would be much easier to fix!
Any ideas?
tia,
r.b.

A number of flicker issues have been addressed in forms patchsets. Worth noting that some JVMs exhibit flickering problems more than others. These problems can often be
difficult to reproduce so it would be helpful to know what version of forms and the JVM you are using. If you find that it works in one patchset but not another that would also be useful to know. Ultimately you need to log a testcase with support so that the problem can be investigated.
I know that we are already investigating some (at least on the surface) issues which sound similar.
Regards
Grant Ronald
Forms Product Managemen

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I am adding a Canvas to a ScrollPane and adding different Strings to this Canvas using drawString method.
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In addition to the previous reply:
You use an enumeration to go through the strings, which you create outside the paint method. As an enumeration only allows you to go through its contents once, the first call to paint after adding a string will work ok, whereas all subsequent calls will find an empty enumeration, i.e. one, where hasMoreElements returns false immediately.
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Netbeans 6.1m canvas repaint

Hi there.
Don't know why but have no luck with repaint.
i have
layout.setHorizontalGroup(
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Maybe you have a simple example?
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Maybe someone else has some kind of an example where a user can just give coordinates where to paint things.
In my case i need to have the posibility to read information by pixels.
Edited by: isolated on Oct 6, 2008 10:29 AM
Edited by: isolated on Oct 6, 2008 11:29 AM

The code is provided here too:
[http://pastebin.com/m5b9b16fa] - program part that extends canvas and generates image
[http://pastebin.com/m203b0295] - part where we should load image.
As i mentioned before this problem can be caused by the netbeans, so if anybody uses netbeans try the whole project,
it will be more informative.
Edited by: isolated on Oct 6, 2008 10:34 PM

J2ME - Canvas - repaint

Hi,
I have a stupid question. As far as I know the Canvas class of J2ME doesn't have getGraphics() method. That means, that I can't get the graphic representation of the Canvas object and so I can't make changes calling the properly methods of the Graphics class.
However, the repaint() method is the only way, to do this?
Say, I want to draw a string to the screen when the user hits a button.
How can I do this?
Thanks in advance,
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Hi!! I�ve a little problem, when i used repaint() method, the canvas don�t clear.
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Problem about canvas repaint!

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
class DrawPie extends Canvas{
Container cont;
public DrawPie(Container parent){
cont=parent;
public void addinContainer(){
this.setSize(200,200);
cont.add(this,BorderLayout.SOUTH);
public void paint(Graphics g){
g.drawString("This is test",20,20);
public class WelFrame extends JFrame {
JPanel contentPane;
BorderLayout borderLayout1 = new BorderLayout();
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public WelFrame() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
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Button btn=new Button("Open");
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contentPane.setLayout(borderLayout1);
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this.setTitle("Welcome to JBuilder");
this.setSize(new Dimension(400, 300));
//Overridden so we can exit when window is closed
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
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System.exit(0);
//File | Exit action performed
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System.exit(0);
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dp.addinContainer();
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wf.show();
I can't get the text painted when click the button open.But when i resize the Frame,the text appeared.
how can i get the text painted when i click the button open.Thanks a lot.

When you add a component to another component, call it the parent component, AFTER YOU HAVE CONSTRUCTED THE PARENT COMPONENT, you need to call the method validate()on the parent component to insure that this component, the parent component, has a valid layout. In your code, you're adding your component which extends Canvas to the parent component which extends JFrame AFTER instanciating it. Hence, you need to call validate() on this parent right after adding the child component. In other words, your method btn_actionPerformed should look like the following:
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calling validate() will insure re-arrenging all children correctly according to the parent layout. When you resize your form, validate is called automatically and that's why the child component shows up.
Without calling validate(), your newly added child component is not resized and located according to the parent layout. it's probably with the size 0,0 and that's why you're not seeing the text.
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Repainting a custom canvas

I have sub-classed java.awt.Canvas to make my own Progress Bar looking component.
Then I place that in a java.awt.Dialog, when the user clicks the java.awt.Button, the progress bar should repaint() itself to fill the bar up to the point of it's progress all of which is done by calling a custom method that moves the progress value by 1 and calls repaint() inside a for-loop.
It works fine except for it does not repaint until the for-loop is done, but I do call inside the loop the canvas' repaint() method, as well as the custom progress() method which itself calls repaint().
I have a loop that makes two (2) calls to method repaint() of class Canvas, but the Canvas does not repaint() until the end of the loop.

placing repaint inside a for loop will NOT do what you want it to.
I will have to go into a little more depth to explain why....
when repaint is called, it does not cause an immediate repaint - instead - it posts a repaint request in the event queue. The event queue will not be serviced until your for loop has completed, so none of the repaints will be performed until the end of the loop.
What you need to do, is create a seperate Thread, that calls repaint, and then sleeps for a set period (something like 100ms) while your updating thread is sleeping, the repaint event you have requested(by calling repaint()) will be processed, and you will see the progressbar update.
rob,
p.s.
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How to repaint a JPanel in bouncing balls game?

I want to repaint the canvas panel in this bouncing balls game, but i do something wrong i don't know what, and the JPanel doesn't repaint?
The first class defines a BALL as a THREAD
If anyone knows how to correct the code please to write....
package fuck;
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        if(!collide) {
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            coll_y=b.getCenterY();
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public class BouncingBalls extends JFrame{
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    public BufferedImage buffer;
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        Container contentPane = getContentPane();
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            final int h=getSize().height-5;
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            public void update(Graphics g)
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            public void paintComponent(Graphics g) {
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} And when i press start button:
Exception in thread "Thread-2" java.lang.NullPointerException
at fuck.CollideBall.run(CollideBall.java:153)
Exception in thread "Thread-3" java.lang.NullPointerException
at fuck.CollideBall.run(CollideBall.java:153)
Exception in thread "Thread-4" java.lang.NullPointerException
at fuck.CollideBall.run(CollideBall.java:153)
and line 153 is: balls.canvas.repaint(); in Method run() in First class.
Please help.

public RepaintManager manager;
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Exception in thread "Thread-2" java.lang.IllegalMonitorStateException
at java.lang.Object.notifyAll(Native Method)
at fuck.CollideBall.run(CollideBall.java:153)
Exception in thread "Thread-3" java.lang.IllegalMonitorStateException
at java.lang.Object.notifyAll(Native Method)
at fuck.CollideBall.run(CollideBall.java:153)
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The main culprit is that you are mixing AWT components with Swing ones.
In addition, your are doing so many of useless things and wrong things in your code.
Swing components are defaulted for using double-buffering.
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Try and study this code.
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Do you neeed help upgrading your Oracle Forms to the Web?

If you are looking for help upgrading your Oracle Forms applications to the Web, join Oracle's partner for free internet seminars and see how they can help you.
These seminars feature partners specializing in character mode to the Web migration.
Seminars are scheduled online on Feb-13 and 14 11:00am PST (California time).
To register:
http://oracledirect.oracle.com/iccdocs/seminarList.shtml

Hi, We are in the process of converting our inhouse developed applications (Forms 5.0 and Reports 3.0) into web enabled one. Since I am outside the US , I am unable to attend the free seminar help recently. I would appreciate your help in sending any documentation/handouts on the current topic. This will help me a lot.
Kind Regards,
Pandian
Muscat

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Repaint() method 's not work but paint(getGraphics()) does, why?

I've just read the following code ( in the Core Java 2 advance features vol 2 book):
import java.awt.*;
import java.awt.event.*;
   import java.awt.geom.*;
   import java.util.*;
   import javax.swing.*;
      Shows an animated bouncing ball.
public class Bounce
     public static void main(String[] args)
        JFrame frame = new BounceFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.show();
     The frame with canvas and buttons.
class BounceFrame extends JFrame
        Constructs the frame with the canvas for showing the
        bouncing ball and Start and Close buttons
     public BounceFrame()
        setSize(WIDTH, HEIGHT);
        setTitle("Bounce");
        Container contentPane = getContentPane();
        canvas = new BallCanvas();
        contentPane.add(canvas, BorderLayout.CENTER);
        JPanel buttonPanel = new JPanel();
        addButton(buttonPanel, "Start",
           new ActionListener()
                 public void actionPerformed(ActionEvent evt)
                    addBall();
        addButton(buttonPanel, "Close",
           new ActionListener()
                 public void actionPerformed(ActionEvent evt)
                   System.exit(0);
        contentPane.add(buttonPanel, BorderLayout.SOUTH);
        Adds a button to a container.
        @param c the container
        @param title the button title
        @param listener the action listener for the button
     public void addButton(Container c, String title,
        ActionListener listener)
        JButton button = new JButton(title);
        c.add(button);
        button.addActionListener(listener);
        Adds a bouncing ball to the canvas and makes
        it bounce 1,000 times.
     public void addBall()
        try
           Ball b = new Ball(canvas);
           canvas.add(b);
           for (int i = 1; i <= 1000; i++)
              b.move();
              Thread.sleep(5);
        catch (InterruptedException exception)
     private BallCanvas canvas;
     public static final int WIDTH = 450;
     public static final int HEIGHT = 350;
    The canvas that draws the balls.
class BallCanvas extends JPanel
        Add a ball to the canvas.
        @param b the ball to add
   public void add(Ball b)
       balls.add(b);
    public void update(Graphics g) {
         super.update(g);
         System.out.println("Test");
    public void paintComponent(Graphics g)
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D)g;
      for (int i = 0; i < balls.size(); i++)
         Ball b = (Ball)balls.get(i);
         b.draw(g2);
        // System.out.println("Test");
    private ArrayList balls = new ArrayList();
    A ball that moves and bounces off the edges of a
   component
class Ball
        Constructs a ball in the upper left corner
        @c the component in which the ball bounces
    public Ball(Component c) { canvas = c; }
       Draws the ball at its current position
       @param g2 the graphics context
    public void draw(Graphics2D g2)
       g2.fill(new Ellipse2D.Double(x, y, XSIZE, YSIZE));
      Moves the ball to the next position, reversing direction
      if it hits one of the edges
   public void move()
      x += dx;
      y += dy;
       if (x < 0)
          x = 0;
          dx = -dx;
     if (x + XSIZE >= canvas.getWidth())
         x = canvas.getWidth() - XSIZE;
          dx = -dx;
       if (y < 0)
         y = 0;
          dy = -dy;
       if (y + YSIZE >= canvas.getHeight())
          y = canvas.getHeight() - YSIZE;
          dy = -dy;
       //canvas.paint(canvas.getGraphics());//this would OK.
       canvas.repaint();//This not work, please tell me why?
    private Component canvas;
    private static final int XSIZE = 15;
   private static final int YSIZE = 15;
   private int x = 0;
   private int y = 0;
   private int dx = 2;
   private int dy = 2;
}this program create a GUI containing a "add ball" button to creat a ball and make it bounce inside the window. ( this seems to be stupid example but it is just an example of why we should use Thread for the purpose ).
Note: in the move() method, if i use canvas.repaint() then the ball is not redrawn after each movement. but if i use canvas.paint(canvas.getGraphics()) then everythings seem to be OK.
Another question: Still the above programe, but If I create the ball and let it bounce in a separate thread, then canvas.repaint() in the move method work OK.
Any one can tell me why? Thanks alot !!!

I don't know why the one method works. Based on my Swing knowledge neither method should work. Did you notice that the JButton wasn't repainted until after the ball stopped bouncing. That is because of the following code:
for (int i = 1; i <= 1000; i++)
    b.move();
    Thread.sleep(5);
}This code is attempting to move the ball and then sleep for 5 milliseconds. The problem with this code is that you are telling the Event Thread to sleep. Normally painting events are added to the end of the Event Thread to allow for multiple painting requests to be combined into one for painting efficiency. When you tell the Thread to sleep then the GUI doesn't get a chance to repaint itself.
More details about the EventThread can be found in the Swing tutorial:
http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html
This explains why the button isn't repainted, but it doesn't explain why the ball bounces. I don't know the answer to this for sure, but I do know that there is a method called paintImmediately(...) which causes the painting to be performed immediately without being added to the end of the Event Thread. This means the painting can be done before the Thread sleeps. Maybe the canvas.paint(....) is somehow invoking this method.
When you click on the button this code is executed in the EvWell in Swing, all GUI painting is done on the Event Thread

Canvas repainting in web migration

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