Archive for February, 2010

Tablet User Interface Design

Saturday, February 13th, 2010

This is a rather good article about the state of user interfaces for tablets.
http://gizmodo.com/5461767/the-two-wrong-ways-to-make-a-tablet

The summary is that in the market currently, there are 2 main ways of building a tablet interface:
- Taking a desktop interface and shrinking it to a tablet interface (Windows Tablets)
- Taking a mobile device (phone) interface, and blowing it up to the size of a tablet (iPad and Android tablets)

Both cases are suboptimal. What is needed is a radically different way of doing a tablet interface.

Introducing the Microsoft Courier Tablet.
http://www.pcworld.com/article/181487/microsoft_courier_a_feature_breakdown.html

I have never been a fan of Microsoft, but I must say that I would definitely be interested to lay my hands on one of this tablet if it were available!

Amazing Battery life on my Palm Pre

Thursday, February 4th, 2010

Battery life on my Palm Pre has never been that great, maybe because smartphones, in general, encourage you to really use them. 3g, surfing, calls, sms… everything is so easy and fast and usable.
In the last 4 days that I’ve been in china, I realised something - the Palm Pre has amazing standby life!
Ok, some disclaimers here. I think over here, my connection is limited to 2G/EDGE connection. That, from what i’ve read, helps. My usage has been really low, a few sms’s a day, checking calendar and contact information, and a few phone calls, and even wireless surfing a bit.
But it has been on *all* the time, no recharges, no airplane mode, always on.

But still, I’ve been absolutely amazed. It has lasted me absolutely 4 days. Full 4 days!

This is something I should investigate more….

Rotating screen in Thinkpad x61T Tablet with Ubuntu Karmic

Tuesday, February 2nd, 2010

If you read my comments on my own post on screen rotation on my thinkpad tablet you’ll read that I was having problems rotating my screen on my X61T tablet (1400×1050 resolution). I didn’t have any luck with that until this week, when I had some time to do some research again.

Thanks to this site, I am now able to do it:
http://www.shrapnull.com/v1/node/22

Basically, the scripts here are much simpler and cleaner.
Below is the code to rotate the screen :

#!/bin/sh
#/etc/acpi/x200tsdown.sh
echo ‘Rotating screen…’
if [ "`/usr/bin/xrandr -o right -v | grep -i 'randr' | wc -l`" -ne "1" ]
then
echo ‘!! Something went wrong…’
export DISPLAY=”:0.0″
export XAUTHORITY=/var/lib/gdm/\:0.Xauth
/bin/xset -display $DISPLAY dpms
echo ‘Trying to rotate again…’
/usr/bin/xrandr -o right
fi
echo ‘Rotating stylus…’
/usr/bin/xsetwacom set stylus rotate cw
echo ‘Starting keyboard…’
/usr/bin/onboard&

Now, this code doesn’t *quite* work 100%. Somehow on the x61t, the wacom digitiser is not listed as “stylus”. Instead, running the command

xsetwacom list

shows me that it is listed as “eraser”. So the script works perfectly when you replace “/usr/bin/xsetwacom set stylus rotate cw” with “/usr/bin/xsetwacom set eraser rotate cw”

What I couldn’t get working was the acpi events. It basically means that I can’t get the tablet to rotate automatically when I flipped it to tablet mode, and revert to normal orientation when I flipped it back to laptop mode.

Instead, I used Gnome’s System-> Preferences -> Keyboard Shortcuts to map the tablet rotation key to launch the rotation script, and the Thinkvantage key to launch the back-to-normal script.

I couldn’t find a way to override the Tablet “Toolbox” key NOT to go into screensaver mode… something for me to do in future I guess.

Oh yes, and the instructions here http://liken.otsoa.net/blog/index.php?entry=entry080617-120522 on Keyboard in GDM and Screen Lock

GDM

In /etc/gdm/Init/Default, before exit 0, add:

/usr/bin/cellwriter –keyboard-only –read-only –window-y=600 –window-x=200 &

In /etc/gdm/PostLogin/Default, add:

killall -u root cellwriter &

In /etc/gdm/PostSession/Default, before exit 0, add:

sudo killall -u $USER cellwriter

SCREEN LOCK

Edit Gnome Registry with gconf-editor. In apps/gnome-screensaver

embedded_keyboard_command cellwriter –keyboard-only –xid
embedded_keyboard_enabled [TRUE]

works very well.

I am happy. :-)