Version 1 of PocketPC TapAndHold

Updated 2006-02-02 21:39:35

PWE 20060202 Since a pocketpc does't have a mouse, but only a stylus, there is no right mouse button. The context sensitive menu's usually bound to the right mouse button, are displayed on the pocket pc after a Tap&Hold, meaning to press the stylus for about a second, after which the menu appears. During the waiting time some balls are shown to indicate that a menu will appear. This is my attempt to do something similar in tcl:

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 namespace eval ::tapandhold {
   variable ballcount 0
   variable afterid ""
   variable nrballs 8 
   variable balldistance 20 
   variable ballsize 10
   variable PI [expr {atan(1.0) * 4.0}]

   proc showball {command w m x y} {
     variable ballcount
     variable nrballs
     variable balldistance
     variable ballsize
     variable afterid
     variable PI
     if { $ballcount < $nrballs } {
       set angle [expr {2.0*$PI*($ballcount+0)/$nrballs} ]
       set dx [expr {int($balldistance*sin($angle))}]
       set dy [expr {int(-$balldistance*cos($angle))}]
       toplevel .tapandholdball_$ballcount 
       wm overrideredirect .tapandholdball_$ballcount true
       wm geometry .tapandholdball_$ballcount "${ballsize}x${ballsize}+[expr {$x+$dx}]+[expr {$y+$dy}]"
       pack [canvas .tapandholdball_$ballcount.c -bg blue -width $ballsize -height $ballsize]
       set afterid [after 100 "::tapandhold::showball $command $w $m $x $y"]
       incr ballcount
     } else {
       ::tapandhold::stopball 
       update
       bell
       if { $command eq "popup" } {
         tk_popup $m $x $y 0
       } else {
         $m $w $x $y
       }
     }
   }
   proc stopball { } {
     variable ballcount
     variable afterid
     catch { after cancel $afterid}
     for { set n  0 } { $n < $ballcount } { incr n } {
       destroy .tapandholdball_$n
     }
     set ballcount 0

   }
   proc tapandhold_bind {command w m} {
     if { $command ne "popup" && $command ne "command" } {
       error "bad option $command must be popup or command"
     }
     bind $w <ButtonPress-1> "
       ::tapandhold::showball $command $w $m %X %Y
     "
     bind $w <ButtonRelease-1> {
       ::tapandhold::stopball 
     } 
     bind $w <Motion> {
       ::tapandhold::stopball 
     }
   }
 }

A little demonstration (must be little to fit the pocketpc).

 proc makemymenu { window x y } {
   menu .menu2 -tearoff false
   set now [clock format [clock seconds]]
   set comm [list .t1 insert end $now\n]
   .menu2 add command -command $comm -label $now 
   puts [tk_popup .menu2 $x $y 0]
   update
   destroy .menu2
 }

 menu .menu -tearoff false
 .menu add command -label {Item1}  -command {.t insert end "Choosen 1\n"}
 .menu add command -label {Item2}  -command {.t insert end "Choosen 2\n"}

 pack [text .t -height 10 -width 35]
 pack [text .t1 -height 10 -width 35]
 ::tapandhold::tapandhold_bind popup .t .menu
 ::tapandhold::tapandhold_bind command  .t1 makemymenu

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It's a bit tricky to use it on the pocketpc, since any movement of the stylus will abort the tap&hold. SRIV Neat! I've been thinking of adding something like this into Whim for use on the N770. WOuld it be less tricky if you took out the <Motion> handler, or is that needed?

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