Solved

problem with Object flicker on MouseEvents

Posted on 1998-11-11
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217 Views
Last Modified: 2010-03-30
public class Applet1 extends Applet
{
    private class MyEvent implements java.awt.event.MouseListener
    {
        public void mouseClicked (java.awt.event.MouseEvent mlEvent)
        {
        }
       
        public void mousePressed (java.awt.event.MouseEvent mEvent)
        {
        }
       
        public void mouseReleased (java.awt.event.MouseEvent mEvent)
        {
        }

        public void mouseEntered (java.awt.event.MouseEvent mEvent)
        {
        }

        public void mouseExited (java.awt.event.MouseEvent mEvent)
        {
        }
       
        private void FretBoard_Clicked (Object obj, java.awt.event.MouseEvent mlEvent)
        {
        }
    }

    //{{DECLARE_CONTROLS
   /}}
   
  public void init()
  {
  //{{INIT_CONTROLS
 setLayout(null);
 setBounds(0, 0, 640, 480);
 
 ImageButton imgFret = new ImageButton();
 imgFret.setBevelHeight(0);
 imgFret.setImageURL(new java.net.URL("file:///C:/FretBoard.jpg"));
  imgFret.setBorderColor(new java.awt.Color(16777215));
  imgFret.setButtonColor(new java.awt.Color(16777215));
  imgFret.setImageStyle(symantec.itools.awt.ImageButton.IMAGE_NORMAL);
  imgFret.setUseOffset(true);
  imgFret.setNotifyDelay(0);
  imgFret.setBounds(24, 24, 602,155);

  add (imgFret);

 // Add MouseListener to the Image Component
 imgFret.addMouseListener (new MyEvent());
 //}}
}
}  



Hello,
The above extract of code places an image (extends java.awt.Component) onto a panel and adds a listener for the mouseevents.

It is possible to click on the images but the image flickers everytime the mouse button is depressed.  How can I avoid this flicker?

Thanks for any help you can offer,

Rob.
0
Comment
Question by:robertod031297
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4 Comments
 
LVL 16

Expert Comment

by:heyhey_
ID: 1227222
there are two possible reasons for flickering
1. this can be a platform problem - try the applet with different browsers & appletviewer
if it does not depends on the JavaVM implementation then
2.) it should be Symantec's fault
  ( I saw this line 'symantec.itools.awt.ImageButton.IMAGE_NORMAL')
check the documentation from symantec and maybe some examples ...

:-) i've seen many images that does not flicker. I'd recomend you not to use third party componnent for simple applets - at least if you write them yourself, you'll know exactly what happens ...

hope this helps
  heyhey
0
 
LVL 16

Accepted Solution

by:
heyhey_ earned 50 total points
ID: 1227223
there are two possible reasons for flickering
1. this can be a platform problem - try the applet with different browsers & appletviewer
if it does not depends on the JavaVM implementation then
2.) it should be Symantec's fault
  ( I saw this line 'symantec.itools.awt.ImageButton.IMAGE_NORMAL')
check the documentation from symantec and maybe some examples ...

:-) i've seen many images that does not flicker. I'd recomend you not to use third party componnent for simple applets - at least if you write them yourself, you'll know exactly what happens ...

hope this helps
  heyhey
0
 
LVL 16

Expert Comment

by:heyhey_
ID: 1227224
Sorry :((
damn browsers ...
0
 

Author Comment

by:robertod031297
ID: 1227225
Hello heyhey_ (wtf?)

I spotted the problem in reading your answer.  This component was originally a blank imagebutton and I wanted to replace the imagebutton with a plain image.  The fact that it's a button means it responds visually to mouseclicks and that explains my flicker - it's just the button responding.

Take Care,

Rob.

0

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