Two key bindings for a single button

[Chris Kimball]

I'd like to have button, set as the default button, respond to either RETURN or SHIFT-RETURN. That is, when the button is in focus, either a return or shift-return operate the button.

I'd hate to have to define an Action to do this.

[Darryl Burke]

From the InputMap, get the value associated with <Enter> and bind it to <Shift>+<Enter>. Something like

inputMap.put(KeyStroke.getKeyStroke("shift ENTER"), inputMap.get(KeyStroke.getKeyStroke("ENTER"));

[Chris Kimball]

I get the idea and it's neat. However,

        button2 = new JButton("Done");
        button2.setDefaultCapable(true) ;
        InputMap inputMap = button2.getInputMap();
        KeyStroke[] keyStrokes = inputMap.allKeys() ;
      	System.out.println("As initialized: ") ;
        for (int i =0; i < keyStrokes.length; i++){
        	System.out.println(i + "  " + keyStrokes[i]) ;
        }

        inputMap.put(KeyStroke.getKeyStroke("shift pressed SPACE"), inputMap.get(KeyStroke.getKeyStroke("pressed SPACE")) );  
        inputMap.put(KeyStroke.getKeyStroke("shift released SPACE"), inputMap.get(KeyStroke.getKeyStroke("released SPACE")) );  
        
      	System.out.println("After 2 puts: ") ;
        keyStrokes = inputMap.allKeys() ;
        for (int i =0; i < keyStrokes.length; i++){
        	System.out.println(i + "  " + keyStrokes[i]) ;
        }

yields

As initialized:
0 pressed SPACE
1 released SPACE
After 2 puts:
0 shift pressed SPACE
1 shift released SPACE
2 pressed SPACE
3 released SPACE

as expected, but the button still doesn't respond to shift-return. (It responds OK to return.) I don't see why the InputMap has space, rather than enter or return.

Note the button is the default button on the containing JPanel. It's working properly in that mode.

Is there a correct time to set the InputMap? I'm doing it immediately after button instantiation.

Thanks!

[Darryl Burke]

You probably need to use the InputMap for WHEN_IN_FOCUSED_WINDOW

[Chris Kimball]

Alas, all non-void arguments to getInputMap() cause the method to return null, crashing the println loop.

I've gotten the ActionMap for the button ("pressed", "released") and tried plugging actions[0] ("pressed") into the InputMap.

inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, InputEvent.SHIFT_MASK ), actions[0] );

where I've set the KeyStroke explicitly.

I've been working with InputMap rather than ComponentInputMap. Don't understand the difference.

Thanks,

Chris

[Chris Kimball]

Apparently I needed to be working with the RootPane, as that's where the default button is connected. The following seems to work correctly"

        button2 = new JButton("Done");
        button2.setDefaultCapable(true) ;
        button2.setEnabled(true) ;
        JRootPane rp = getRootPane() ;
        rp.setDefaultButton(button2) ;
        
        InputMap inputMap = rp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW) ;
        KeyStroke[] keyStrokes = inputMap.allKeys();
        if(keyStrokes != null){
        	for(int i = 0; i < keyStrokes.length; i++ ){
        		System.out.println(i + "    " + keyStrokes[i] ) ;
        	}
        	
        }
        else{
        	System.out.println("keyStrokes is null.") ;
        }
        inputMap.put(KeyStroke.getKeyStroke("shift ENTER"), inputMap.get(KeyStroke.getKeyStroke("ENTER")) ); 
        button2.addActionListener(this);

Thanks for your useful suggestion.

Chris

[Michael Dunn]

> ...set as the default button,.... That is, when the button is in focus...

the two don't match - 'default button' requires no focus