java list selection ordering:

trscookie · 01-28-2008, 03:47 AM

Hello all,

I am trying to make a list box so when you scroll down in it using the arrow keys and hit the bottom it takes you back up to the top of the list again, however when I get to the bottom of the list and hit the down arrow again it scrolls to the second item in the list!

Code:

82     private void lstLastActionKeyPressed(java.awt.event.KeyEvent evt)//GEN-FIRST:event_lstLastActionKeyPressed
 83     {//GEN-HEADEREND:event_lstLastActionKeyPressed
 84
 85         int keyDown = java.awt.event.KeyEvent.VK_DOWN;
 86         int keyCode = evt.getKeyCode();
 87
 88
 89         log.slog( "Selected Item: " + Integer.toString( lstLastAction.getSelectedIndex() ) );
 90
 91         log.slog( "Last Keypress: " + Integer.toString( evt.getKeyCode() ) );
 92
 93         if( java.awt.event.KeyEvent.VK_ESCAPE == evt.getKeyCode() )
 94         {
 95
 96             log.info( Integer.toString( evt.getKeyCode() ) );
 97
 98             this.dispose();
 99
100         }
101
102         if( keyCode == keyDown )
103         {
104
105             log.slog( "Selected: " + lstLastAction.getSelectedIndex()
106                             + ", last Item: " + ( lstLastAction.getModel().getSize()-1 ) );
107
108             if( lstLastAction.getSelectedIndex() == ( lstLastAction.getModel().getSize()-1 ) )
109             {
110
111                 log.slog( "Waiting for key: " + keyDown + ", Key pressed: " + Integer.toString( keyCode ) );
112
113                 log.info( "End of list." );
114
115                 lstLastAction.setSelectedIndex( lstLastAction.getFirstVisibleIndex() );
116
117             }
118
119         }
120
121     }

thanks, trscookie.

trscookie · 01-29-2008, 07:55 AM

I have noticed that for some reason the index of the list box is not in order, the index does not seem to represent the number of the item in the list:

Code:

Last Keypress: 40
Selected: 0, last Item: 4
Selected Item: 1
Last Keypress: 40
Selected: 1, last Item: 4
Selected Item: 2
Last Keypress: 40
Selected: 2, last Item: 4
Selected Item: 3
Last Keypress: 40
Selected: 3, last Item: 4
Selected Item: 4
Last Keypress: 40
Selected: 4, last Item: 4
Waiting for key: 40, Key pressed: 40
End of list.
Selected Item: 1
Last Keypress: 38
Selected Item: 0
Last Keypress: 40
Selected: 0, last Item: 4
BUILD SUCCESSFUL (total time: 1 minute 28 seconds)