Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.gui > #4992

Re: Setting extent in JSlider model

Show all headers | View raw

On 2/3/2012 12:35 PM, Fred wrote:
> How can I set how much a slider will change when the user hits the
> PageUp of PageDown key, and when the user clicks in the slider's
> trough?
>
> The javadoc for JSlider's model (BoundedRangeModel) setExtent() method
> states:
>
>    When used with a slider, the extent determines how much the value
> can "jump", for
>    example when the user presses PgUp or PgDn.
>
> However, setExtent() seems to have no effect. When I use the PgUp or
> PgDn key, the value always changes 10% of the range regardless of the
> value I request for extent.
>
> As for clicking in the trough, metal L&F always seems to increment (or
> decrement) the value by one, and for Nimbus it is the same as PgUp/
> PgDn.
> --
> FredK

It can be very annoying when the L&F prevents a change to a value that 
has a setter method.  You might look to see if you can find a UI 
property that could change that.  The problem is that I've found even if 
there is a UI property the methods in the L&F may not honor them.  I 
extended a menu item class to be able to do that but it may or may not 
work in the future.  I just figured it was a quick fix for the moment 
and if it didn't work in the future I could take it out.

This program will list all the UIDefaults:

import java.util.Enumeration;

import javax.swing.UIDefaults;
import javax.swing.UIManager;

public class ListUIProperties {
   public static void main(String args[]) throws Exception {
     UIManager.LookAndFeelInfo looks[] = 
UIManager.getInstalledLookAndFeels();

     for (UIManager.LookAndFeelInfo info : looks) {
       UIManager.setLookAndFeel(info.getClassName());

       UIDefaults defaults = UIManager.getDefaults();
       Enumeration newKeys = defaults.keys();

       while (newKeys.hasMoreElements()) {
         Object obj = newKeys.nextElement();
         System.out.printf("%50s : %s\n", obj, UIManager.get(obj));
       }
     }
   }
}


-- 

Knute Johnson

Back to comp.lang.java.gui | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Setting extent in JSlider model Fred <fred.l.kleinschmidt@gmail.com> - 2012-02-03 12:35 -0800
  Re: Setting extent in JSlider model Knute Johnson <nospam@knutejohnson.com> - 2012-02-07 10:24 -0800
    Re: Setting extent in JSlider model "John B. Matthews" <nospam@nospam.invalid> - 2012-02-07 15:23 -0500

csiph-web