Hi Matthew,

I believe you have a Mac Mini?  Under Snow Leopard, I don't know whether you 
can toggle the Preview pane without a mouse to double click on the horizontal 
splitter in the Mail window.  I suspect the answer is no, unless you get 
Apple's Magic Trackpad to use in place of a mouse. Under Leopard, turning on 
Numpad commander and using the numeric keypad to perform a click had the same 
status as a "hardware click" by pressing a trackpad or physical mouse button, 
and would work even in situations where performing a "software click" with 
VO-Shift-Space would not work.  But in Leopard, I could also toggle the Preview 
pane on or off by double clicking with VO-Shift-Space.  I just checked that 
under Snow Leopard, I apparently can't use the Numpad Commander key action to 
click the mouse -- it works in situations where clicking with VO-Shift-Space 
will work, but not in the present instance where I have to click with a 
trackpad.  I went into VoiceOver Utility (VO-F8), pressed "c" to go to the 
Commanders menu, and then went to the Trackpad menu (VO-RIght arrow and 
VO-Space on "Trackpad").  I checked the box to "Enable Numpad Commander" 
(VO-Space), and then navigated (VO-Right arrow) to the table of Numpad 
Commander key assignments and interacted.  Since the "3" key was unassigned, I 
used VO-Space in the column for the command, arrowed down to "General", then 
arrowed right to the sub-menu (you can also press VO-Space to navigate to the 
sub-menu), and selected "Click Mouse" for the key assignment by pressing "c l" 
(you can also arrow down the selections).

However, when I tried to use the "3" key to double-click on the horizontal 
splitter, I heard the same clicking sound that I hear when I use VO-Shift-Space 
to double-click, but the splitter didn't drop. I should mention that I didn't 
use my USB numeric keypad for this experiment, so it's possible that if you use 
the numeric keypad on a full-size keyboard it may make a difference, but I 
doubt it.  I tried double-clicking by holding down the left arrow key and 
double-tapping the "3" key in the number row of my laptop.  (I don't know 
whether you remember this, but there was a fascinating post in the archive some 
months ago that you can get the Numpad Commander key actions by pressing one of 
the arrow keys along with the number key in the top row in lieu of pressing the 
same key on a numeric keypad if Numpad Commander is turned on in VoiceOver 
utility.)  I also tried using my iPod Touch on the same wireless network with 
Edovia's "NumPad -- Wireless Numeric Keypad" app to generate the Numpad 
commands.  (Don't laugh, this works, and is why I didn't bother to dig out my 
USB numeric keypad.)  The other numpad assigned commands worked, and the "Click 
Mouse" assignment works in other environments (where VO-Shift-Space works), but 
not for dropping the horizontal splitter.

Incidentally, I also tried interacting with the splitter and moving it down 
with VO-Down arrow, but I couldn't get it to drop down all the way this way.  
Only a double click can completely close out the message content window.

There might be some way to read the plist file for mail through a property list 
editor, and configure hidden options, or assign them through a command line 
action in Terminal, but I wouldn't know how to do this.  If you're interested 
in applying the iOS 4 type gestures of the iPhone and other such devices to 
your Mac, you could get Apple's Magic Trackpad and try using it with your Mac 
Mini.  (I assume you're using Snow Leopard, or I think you would be able to use 
VO-Shift-Space to double click on the horizontal splitter.)

Sorry not to have another solution. HTH. Cheers,

Esther

On Jan 15, 2011, at 17:28, matthew Dyer wrote:

> Hey ester,
> 
> Have a question.  I do not have any kind of mouse connected to my machine at 
> the moment.  Is it still possible to togle the preview pain?  Thanks.
> 
> Matthew

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