Re: [cinjug-users] KeyStroke and JScrollPane

[Brian K Bonner <brian.bonner@xxxxxxxxxxxx>]

Jim,

A1:  Assuming your scrollpane is
declared as myScrollPane, then:

InputMap inputMap = myScrollPane.getInputMap(WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
// actionKey is most likely a string
-- this is a key into the ActionMap
Object actionKey = inputMap.get(KeyStroke.getKeyStroke("PAGE_UP"));

// Where "A" is the alternate
keystroke that you want to bind 
inputMap.put(KeyStroke.getKeyStroke("A"),actionKey);
 

Should do the trick.  I just tried
it out.

A2:  InputMap is a Map which maps
the actual keystroke to an ActionKey, a key to find a specific action in
an ActionMap.

Think of it as two related maps:

INPUT MAP

KEYSTROKE	ACTIONKEY
Keystroke("PAGE_UP")	"scrollUp"

ACTIONMAP  (using the ActionKey
from InputMap)

ACTIONKEY	ACTION
"scrollUp"	ActionInstance

HTH,

Brian




James Hurt <JimHurt@xxxxxxxx> wrote on 12/20/2004
08:38:20 PM:

> I have need to use different key strokes than the default to scroll
around a
> JScrollPane.  That is, I need to use certain keys such as Page_Up
to mean
> something different than scroll the JScrollPane one block up.  My
problem is
> that JScrollPane is capturing the Page_Up key strokes and not 
> passing them on to
> my code.
> 
> Q1: How do I change the scrolling key settings for JScrollPane from
> the default
> to something I specify?
> 
> Q2: What is the difference between an InputMap and an ActionMap?  
> When do I use
> one and not the other?
> 
> Jim Hurt
> 
> 
> 
> 
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