JB 9 designer help

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2 total messages Started by Sven Goetgeluck Tue, 24 Feb 2004 16:04

#1228

Author: Sven Goetgeluck
Date: Tue, 24 Feb 2004 16:04

115 lines
4014 bytes

hi ,
when opening my dialog in designer i'll get following error
java.lang.IllegalAccessException: Class com.borland.jbuilder.cmt.jb.JbValue
can not access a member of class vrex4.MyScrollPane with modifiers "public"
new MyScrollPane()

anybody has an idea what it means??

thanks Sven



this is the code for the scrollpane


class MyScrollPane
    extends JScrollPane {
  private static boolean doReset = true;

  public MyScrollPane(Component view, int vsbPolicy, int hsbPolicy) {
    super(view, vsbPolicy, hsbPolicy);

    // Set the component to transparent
    if (view instanceof JComponent) {
      ( (JComponent) view).setOpaque(false);
    }
    this.getHorizontalScrollBar().addAdjustmentListener(
        new AdjustmentListener() {
      public void adjustmentValueChanged(AdjustmentEvent ae) {
        if (ae.getSource()instanceof JScrollBar) {


           // ( (JScrollBar) ae.getSource()).setValue(0);
           if (doReset) {

                                           doReset = false;
                                            ((JScrollBar)
ae.getSource()).setValue(0);
                                           doReset = false;
                                   }


        }
      }
    });
    this.getVerticalScrollBar().addAdjustmentListener(
    new AdjustmentListener() {
  public void adjustmentValueChanged(AdjustmentEvent ae) {
    if (ae.getSource()instanceof JScrollBar) {


      if (doReset) {

                                 doReset = false;
                                  ((JScrollBar) ae.getSource()).setValue(0);
                                 doReset = false;
                         }



    }
  }
}

    );

  }

  public void setReset(boolean sw) {
    doReset = sw;

     this.getVerticalScrollBar().setValue(0);
     this.getHorizontalScrollBar().setValue(0);

  }

  public MyScrollPane(Component view) {
    this(view, VERTICAL_SCROLLBAR_AS_NEEDED,
HORIZONTAL_SCROLLBAR_AS_NEEDED);
  }

  public MyScrollPane(int vsbPolicy, int hsbPolicy) {
    this(null, vsbPolicy, hsbPolicy);
  }

  public MyScrollPane() {
    this(null, VERTICAL_SCROLLBAR_AS_NEEDED,
HORIZONTAL_SCROLLBAR_AS_NEEDED);
  }

  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    if (image != null) {
      // Draw the background image
      Rectangle d = getViewport().getViewRect();
      for (int x = 0; x < d.width; x += image.getIconWidth()) {
        for (int y = 0; y < d.height; y += image.getIconHeight()) {
          g2.drawImage(image.getImage(), x, y, null, null);
          // Do not use cached image for scrolling
        }
      }
      getViewport().setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE);
    }
    super.paint(g2);
    setOpaque(false);
    System.gc();
  }

  public void setBackgroundImage(ImageIcon image) {
    this.image = image;
  }

  ImageIcon image = null;

}

Re: JB 9 designer help

#1229

Author: Gillmer J. Derge (TeamB)
Date: Tue, 24 Feb 2004 16:14

34 lines
2205 bytes

Sven Goetgeluck wrote:
> when opening my dialog in designer i'll get following error
> java.lang.IllegalAccessException: Class com.borland.jbuilder.cmt.jb.JbValue
> can not access a member of class vrex4.MyScrollPane with modifiers "public"
> new MyScrollPane()
> 
> anybody has an idea what it means??

I suspect that your dialog contains a member of type vrex4.MyScrollPane. 
  Something like:

   public class MyDialog extends JDialog {
     private vrex4.MyScrollPane myScrollPane;
     // ...
   }

In order to let you manipulate the "myScrollPane" member, the designer 
is trying to create an instance of vrex4.MyScrollPane.  It does that 
using the no-argument constructor as in "new MyScrollPane()."  Since 
your class doesn't have a no-argument constructor, that's failing.

If you want this class to work in the designer you need to implement a 
no-argument constructor.  If you want to make sure it's never used in an 
actual program, you can do something like this:

   public MyScrollPane() {
     if (!Beans.isDesignTime()) {
       throw new UnsupportedOperationException();
     }
     // ...
   }

-- 
Gillmer J. Derge (TeamB)

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