RE: [ULC-developer] Scroll Pane

[Janak Mulani]

Scroll PaneHi Elizabeth,

Which version of ULC are you using?

Does this problem occur with ULC 6.1.2?

Thanks and regards,

Janak
  -----Original Message-----
  From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Kliman, Elizabeth
  Sent: Saturday, January 06, 2007 1:41 AM
  To: ULC Developer List (E-mail)
  Subject: [ULC-developer] Scroll Pane


  Hi,

  We have a situation where we've got a scroll pane nested within a scroll
pane.  We customized the scrollpane to be able to turn the mouse wheel
scrolling off for the inner scroll pane so that when the mouse is over the
inner scroll pane, it continues to scroll the outer scroll pane instead of
getting stuck inside the inner scroll pane.  Our application is deployed in
a portal.  This works as intended until the user hits the browser refresh
button or until the user switches tabs in the portal.  When the screen
refreshes with the ULC application, the mouse now scrolls in the inner
scroll pane, thus causing it to look stuck when attempting to scroll in the
outer scroll pane.

  Is there any way I can prevent the mouse wheel scrolling from coming back
into the inner scroll pane when the browser is refreshed?

  Here is the code we are using to implement the scroll panes.  I've edited
out the non-significant code and just left the code used for disabling the
mouse wheel scrolling, but as I said before, this code works just fine until
the browser refreshes the ULC application.  The outer scroll pane is created
with the second parameter as true and the inner scroll pane is created with
the second parameter as false.



  package ca.fcc.ulc.application;

  import ca.fcc.ulc.shared.WidgetStyles;
  import com.ulcjava.base.application.ULCComponent;
  import com.ulcjava.base.application.ULCScrollPane;
  import com.ulcjava.base.application.util.Color;

  public class MyScrollPane extends ULCScrollPane implements WidgetStyles {
          private boolean mouseWheelScrolling = true;

          public FccScrollPane(ULCComponent aViewPortView, boolean
aMouseWheelScrolling) {
                  this(aViewPortView);
                  setMouseWheelScrolling(aMouseWheelScrolling);
                  configureMouseWheelScrolling();
          }


          private void configureMouseWheelScrolling(){
                  if (!isMouseWheelScrolling()){
                          upload();
                          invokeUI("disableMouseWheelScrolling");
                  }
          }

          protected String typeString() {
                  return "ca.fcc.ulc.client.UIMyScrollPane";
          }

          private boolean isMouseWheelScrolling() {
                  return mouseWheelScrolling;
          }

          private void setMouseWheelScrolling(boolean aMouseWheelScrolling)
{
                  mouseWheelScrolling = aMouseWheelScrolling;
          }
  }

  _________________________________________________________________________



  package ca.fcc.ulc.client;

  import java.awt.Color;
  import java.awt.event.MouseWheelListener;
  import javax.swing.JScrollPane;
  import com.ulcjava.base.client.UIScrollPane;

  public class UIMyScrollPane extends UIScrollPane {
          public void disableMouseWheelScrolling(){
                  JScrollPane scrollpane = (JScrollPane)getBasicObject();
                  MouseWheelListener[] listeners =
scrollpane.getMouseWheelListeners();
                  for (int i = 0; i < listeners.length; i++) {
                          MouseWheelListener mouseWheelListener =
listeners[i];
                          scrollpane.removeMouseWheelListener(mouseWheelList
ener);
                  }
          }
  }

  Thanks!

  Elizabeth Kliman, B.Sc., SCJP
  Developer / Développeur
  Information Technology / Technologie de l'information
  Farm Credit Canada / Financement agricole Canada
  1800 Hamilton Street, P.O. Box 4320
  1800, rue Hamilton, C.P. 4320
  Regina SK S4P 4L3
  Tel/Tél. : (306) 780-3382 Fax/Télec. : (306) 780-5655
  E-mail/Courriel : [EMAIL PROTECTED]
  Agriculture. It's all we do. L'agriculture... notre raison d'être.
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