Application UI Design Recommendations

Jeremiah Flerchinger jeremiah.flerchinger at
Mon Jul 16 21:47:53 CEST 2007

Mohammed Musallam wrote:
> What I don't like about the "pie chart" is that it clutters the screen 
> when its displayed and it would be confusing at first. I'm wondering 
> if we take a more simplistic approach.
I don't like the idea of a visible pie chart, but an invisible one that 
provides scrolling as you drag outward & clicking in the middle would be 
great.  That's what I originally thought was implied on the wiki page.  
Used in this manner it would also be completely intuitive.
> if we start with the idea:
> * All applications (for day to day) should be a finger application. 
> That includes Contacts, pim/calender, dialer, GPS & basic settings 
> (bluetooth on/off, wifi on/off, etc.)
> * interface should be intuitive
> * Big buttons and uncluttered interface
I have to agree with you on all these issues.  Also what people don't 
understand is the physical screen size is less than half the size of the 
online screenshots.  2x the dpi means 2x smaller screen than what you 
see on your computer.
> Then: menus, popups & dialog boxes should be strictly removed or 
> limited to the bare minimum because of their small nature... it would 
> be difficult to use our fingers on them
I can see limiting, but not removal.  Removing on-screen clutter and 
keeping everything big would be more effective, in my opinion.
> ************
> So I believe to simplify the touch interface:
>     a. single-tap would equal a single click
>     b. tap&hold would represent a double-click
why not just double-click to double-click? that seems far more intuitive 
to me (or don't use it at all).
use the tap&hold for a right click.  many programs almost require a 
right-click.  you also know you could right-click on those early macs by 
pressing the option key & clicking.  i think the right-click is too 
important to ignore.
>     c. a drag would mean a scroll in that direction
totally agree. that would be perfection and useful in almost all apps.
> ************
> ----- Original Message ----
> From: Jeremiah Flerchinger <jeremiah.flerchinger at>
> To: openmoko-apps at
> Sent: Monday, July 16, 2007 1:57:02 PM
> Subject: Re: Application UI Design Recommendations
> The "pie chart" clicking functionality looks very useful as described
> under "Touch Gestures."   I think I would prefer a global behavior of
> scrolling up/down/left/right after a press to scroll up/down/left/right
> and a press-hold would perform a right click and bring up a typical
> menu/dialog of options, if not accompanied by significant
> dragging/scrolling.
> This would present a uniform method of scrolling across the applications
> & the press hold for right click should translate well to any
> application.  The phonebook could be quickly scrolled with a press &
> drag, a second screen could be opened with a simple click to edit the
> contact or call/email/etc, and a press-hold could open a message dialog
> with the contacts name & the option to call or cancel.
> A press-drag left/right is suggested to translate to a click
> right/middle.  It's a good suggestion, but I think scrolling left/right
> would be more useful to the average user and extend better as a general
> case.
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