mingw/lib/tk8.5/demos/entry3.tcl

   1 # entry3.tcl --
   2 #
   3 # This demonstration script creates several entry widgets whose
   4 # permitted input is constrained in some way.  It also shows off a
   5 # password entry.
   6
   7 if {![info exists widgetDemo]} {
   8     error "This script should be run from the \"widget\" demo."
   9 }
  10
  11 package require Tk
  12
  13 set w .entry3
  14 catch {destroy $w}
  15 toplevel $w
  16 wm title $w "Constrained Entry Demonstration"
  17 wm iconname $w "entry3"
  18 positionWindow $w
  19
  20 label $w.msg -font $font -wraplength 5i -justify left -text "Four different\
  21         entries are displayed below.  You can add characters by pointing,\
  22         clicking and typing, though each is constrained in what it will\
  23         accept.  The first only accepts 32-bit integers or the empty string\
  24         (checking when focus leaves it) and will flash to indicate any\
  25         problem.  The second only accepts strings with fewer than ten\
  26         characters and sounds the bell when an attempt to go over the limit\
  27         is made.  The third accepts US phone numbers, mapping letters to\
  28         their digit equivalent and sounding the bell on encountering an\
  29         illegal character or if trying to type over a character that is not\
  30         a digit.  The fourth is a password field that accepts up to eight\
  31         characters (silently ignoring further ones), and displaying them as\
  32         asterisk characters."
  33
  34 ## See Code / Dismiss buttons
  35 set btns [addSeeDismiss $w.buttons $w]
  36 pack $btns -side bottom -fill x
  37
  38 # focusAndFlash --
  39 # Error handler for entry widgets that forces the focus onto the
  40 # widget and makes the widget flash by exchanging the foreground and
  41 # background colours at intervals of 200ms (i.e. at approximately
  42 # 2.5Hz).
  43 #
  44 # Arguments:
  45 # W -           Name of entry widget to flash
  46 # fg -          Initial foreground colour
  47 # bg -          Initial background colour
  48 # count -       Counter to control the number of times flashed
  49
  50 proc focusAndFlash {W fg bg {count 9}} {
  51     focus -force $W
  52     if {$count<1} {
  53         $W configure -foreground $fg -background $bg
  54     } else {
  55         if {$count%2} {
  56             $W configure -foreground $bg -background $fg
  57         } else {
  58             $W configure -foreground $fg -background $bg
  59         }
  60         after 200 [list focusAndFlash $W $fg $bg [expr {$count-1}]]
  61     }
  62 }
  63
  64 labelframe $w.l1 -text "Integer Entry"
  65 # Alternatively try using {string is digit} for arbitrary length numbers,
  66 # and not just 32-bit ones.
  67 entry $w.l1.e -validate focus -vcmd {string is integer %P}
  68 $w.l1.e configure -invalidcommand \
  69         "focusAndFlash %W [$w.l1.e cget -fg] [$w.l1.e cget -bg]"
  70 pack $w.l1.e -fill x -expand 1 -padx 1m -pady 1m
  71
  72 labelframe $w.l2 -text "Length-Constrained Entry"
  73 entry $w.l2.e -validate key -invcmd bell -vcmd {expr {[string length %P]<10}}
  74 pack $w.l2.e -fill x -expand 1 -padx 1m -pady 1m
  75
  76 ### PHONE NUMBER ENTRY ###
  77 # Note that the source to this is quite a bit longer as the behaviour
  78 # demonstrated is a lot more ambitious than with the others.
  79
  80 # Initial content for the third entry widget
  81 set entry3content "1-(000)-000-0000"
  82 # Mapping from alphabetic characters to numbers.  This is probably
  83 # wrong, but it is the only mapping I have; the UK doesn't really go
  84 # for associating letters with digits for some reason.
  85 set phoneNumberMap {}
  86 foreach {chars digit} {abc 2 def 3 ghi 4 jkl 5 mno 6 pqrs 7 tuv 8 wxyz 9} {
  87     foreach char [split $chars ""] {
  88         lappend phoneNumberMap $char $digit [string toupper $char] $digit
  89     }
  90 }
  91
  92 # validatePhoneChange --
  93 # Checks that the replacement (mapped to a digit) of the given
  94 # character in an entry widget at the given position will leave a
  95 # valid phone number in the widget.
  96 #
  97 # W -     The entry widget to validate
  98 # vmode - The widget's validation mode
  99 # idx -   The index where replacement is to occur
 100 # char -  The character (or string, though that will always be
 101 #         refused) to be overwritten at that point.
 102
 103 proc validatePhoneChange {W vmode idx char} {
 104     global phoneNumberMap entry3content
 105     if {$idx == -1} {return 1}
 106     after idle [list $W configure -validate $vmode -invcmd bell]
 107     if {
 108         !($idx<3 || $idx==6 || $idx==7 || $idx==11 || $idx>15) &&
 109         [string match {[0-9A-Za-z]} $char]
 110     } then {
 111         $W delete $idx
 112         $W insert $idx [string map $phoneNumberMap $char]
 113         after idle [list phoneSkipRight $W -1]
 114         return 1
 115     }
 116     return 0
 117 }
 118
 119 # phoneSkipLeft --
 120 # Skip over fixed characters in a phone-number string when moving left.
 121 #
 122 # Arguments:
 123 # W -   The entry widget containing the phone-number.
 124
 125 proc phoneSkipLeft {W} {
 126     set idx [$W index insert]
 127     if {$idx == 8} {
 128         # Skip back two extra characters
 129         $W icursor [incr idx -2]
 130     } elseif {$idx == 7 || $idx == 12} {
 131         # Skip back one extra character
 132         $W icursor [incr idx -1]
 133     } elseif {$idx <= 3} {
 134         # Can't move any further
 135         bell
 136         return -code break
 137     }
 138 }
 139
 140 # phoneSkipRight --
 141 # Skip over fixed characters in a phone-number string when moving right.
 142 #
 143 # Arguments:
 144 # W -   The entry widget containing the phone-number.
 145 # add - Offset to add to index before calculation (used by validation.)
 146
 147 proc phoneSkipRight {W {add 0}} {
 148     set idx [$W index insert]
 149     if {$idx+$add == 5} {
 150         # Skip forward two extra characters
 151         $W icursor [incr idx 2]
 152     } elseif {$idx+$add == 6 || $idx+$add == 10} {
 153         # Skip forward one extra character
 154         $W icursor [incr idx]
 155     } elseif {$idx+$add == 15 && !$add} {
 156         # Can't move any further
 157         bell
 158         return -code break
 159     }
 160 }
 161
 162 labelframe $w.l3 -text "US Phone-Number Entry"
 163 entry $w.l3.e -validate key  -invcmd bell  -textvariable entry3content \
 164         -vcmd {validatePhoneChange %W %v %i %S}
 165 # Click to focus goes to the first editable character...
 166 bind $w.l3.e <FocusIn> {
 167     if {"%d" ne "NotifyAncestor"} {
 168         %W icursor 3
 169         after idle {%W selection clear}
 170     }
 171 }
 172 bind $w.l3.e <Left>  {phoneSkipLeft  %W}
 173 bind $w.l3.e <Right> {phoneSkipRight %W}
 174 pack $w.l3.e -fill x -expand 1 -padx 1m -pady 1m
 175
 176 labelframe $w.l4 -text "Password Entry"
 177 entry $w.l4.e -validate key -show "*" -vcmd {expr {[string length %P]<=8}}
 178 pack $w.l4.e -fill x -expand 1 -padx 1m -pady 1m
 179
 180 lower [frame $w.mid]
 181 grid $w.l1 $w.l2 -in $w.mid -padx 3m -pady 1m -sticky ew
 182 grid $w.l3 $w.l4 -in $w.mid -padx 3m -pady 1m -sticky ew
 183 grid columnconfigure $w.mid {0 1} -uniform 1
 184 pack $w.msg -side top
 185 pack $w.mid -fill both -expand 1