From: Lyle Johnson <lyle@...>
Date: 2003-01-28T09:19:03+09:00
Subject: Re: FXTexr and widget focus

Gordon Hartley wrote:

> Just got an annoying problem with changing focus off of a FXText
> widget (note: not FXTextField). 
> 
> All the other widgets on my form seem to be fine for tabbing away
> from, but the multiline FXText instead consumes the tabs and stores
> them as a character instead. 
> 
> Anyway, what's the appropriate solution for this? At the moment, I've
> got a hotkey which sets focus on the next control, but that's still
> quite painful, especially since the form is meant to be used for data
> entry...
> 
> The docs on the Fox site don't actually have anything under the
> 'keyboarding' section, so just wondering what other people have done?
> (I presume I'm not the first with this problem?)
> 
> Any ideas?

The most straightforward solution is to intercept the SEL_KEYPRESS 
message that the FXText widget sends to its message target, and then 
handle the tab key yourself. Here's the code:

     myText.connect(SEL_KEYPRESS) { |sender, sel, event|
       if event.code == KEY_Tab
	if (event.state & SHIFTMASK) != 0
	  getApp().focusWindow.handle(self,
             MKUINT(0, SEL_FOCUS_PREV), event)
	else
	  getApp().focusWindow.handle(self,
             MKUINT(0, SEL_FOCUS_NEXT), event)
	end
       else
	0  # keypress was not handled here
       end
     }

This handler first checks to see if this SEL_KEYPRESS message was 
generated because of a tab key press (event.code == KEY_Tab). If it 
wasn't, the handler just returns zero to indicate that it didn't handle 
the SEL_KEYPRESS message and thus the FXText widget should perform its 
normal handling for this keypress event.

If it was in fact a KEY_Tab, we then want to check whether the Shift key 
is down or not (i.e. are we tabbing "backwards" or "forwards"). 
Depending on the shift key state (event.state & SHIFTMASK) we send one 
of two messages to the currently-focused window (focusWindow). 
SEL_FOCUS_PREV tells the current focus window to hand off the focus to 
the previous window in the focus chain; SEL_FOCUS_NEXT does the opposite.

Hope this helps,

Lyle