git.zerfleddert.de Git - micropolis/blob - src/tk/library/demos/mkTextBind.tcl

   1 # mkTextBind w
   2 #
   3 # Create a top-level window that illustrates how you can bind
   4 # Tcl commands to regions of text in a text widget.
   5 #
   6 # Arguments:
   7 #    w -        Name to use for new top-level window.
   8
   9 proc mkTextBind {{w .bindings}} {
  10     catch {destroy $w}
  11     toplevel $w
  12     dpos $w
  13     wm title $w "Text Demonstration - Tag Bindings"
  14     wm iconname $w "Text Bindings"
  15     button $w.ok -text OK -command "destroy $w"
  16     text $w.t -relief raised -bd 2 -yscrollcommand "$w.s set" -setgrid true \
  17             -width 60 -height 28 \
  18             -font "-Adobe-Helvetica-Bold-R-Normal-*-120-*"
  19     scrollbar $w.s -relief flat -command "$w.t yview"
  20     pack append $w $w.ok {bottom fillx} $w.s {right filly} $w.t {expand fill}
  21
  22     # Set up display styles
  23
  24     if {[winfo screendepth $w] > 4} {
  25         set bold "-foreground red"
  26         set normal "-foreground {}"
  27     } else {
  28         set bold "-foreground white -background black"
  29         set normal "-foreground {} -background {}"
  30     }
  31     $w.t insert 0.0 {\
  32 The same tag mechanism that controls display styles in text
  33 widgets can also be used to associate Tcl commands with regions
  34 of text, so that mouse or keyboard actions on the text cause
  35 particular Tcl commands to be invoked.  For example, in the
  36 text below the descriptions of the canvas demonstrations have
  37 been tagged.  When you move the mouse over a demo description
  38 the description lights up, and when you press button 3 over a
  39 description then that particular demonstration is invoked.
  40
  41 This demo package contains a number of demonstrations of Tk's
  42 canvas widgets.  Here are brief descriptions of some of the
  43 demonstrations that are available:
  44
  45 }
  46     insertWithTags $w.t \
  47 {1. Samples of all the different types of items that can be
  48 created in canvas widgets.} d1
  49     insertWithTags $w.t \n\n
  50     insertWithTags $w.t \
  51 {2. A simple two-dimensional plot that allows you to adjust
  52 the positions of the data points.} d2
  53     insertWithTags $w.t \n\n
  54     insertWithTags $w.t \
  55 {3. Anchoring and justification modes for text items.} d3
  56     insertWithTags $w.t \n\n
  57     insertWithTags $w.t \
  58 {4. An editor for arrow-head shapes for line items.} d4
  59     insertWithTags $w.t \n\n
  60     insertWithTags $w.t \
  61 {5. A ruler with facilities for editing tab stops.} d5
  62     insertWithTags $w.t \n\n
  63     insertWithTags $w.t \
  64 {6. A grid that demonstrates how canvases can be scrolled.} d6
  65
  66     foreach tag {d1 d2 d3 d4 d5 d6} {
  67         $w.t tag bind $tag <Any-Enter> "$w.t tag configure $tag $bold"
  68         $w.t tag bind $tag <Any-Leave> "$w.t tag configure $tag $normal"
  69     }
  70     $w.t tag bind d1 <3> mkItems
  71     $w.t tag bind d2 <3> mkPlot
  72     $w.t tag bind d3 <3> mkCanvText
  73     $w.t tag bind d4 <3> mkArrow
  74     $w.t tag bind d5 <3> mkRuler
  75     $w.t tag bind d6 <3> mkScroll
  76
  77     $w.t mark set insert 0.0
  78     bind $w <Any-Enter> "focus $w.t"
  79 }
  80
  81 # The procedure below inserts text into a given text widget and
  82 # applies one or more tags to that text.  The arguments are:
  83 #
  84 # w             Window in which to insert
  85 # text          Text to insert (it's inserted at the "insert" mark)
  86 # args          One or more tags to apply to text.  If this is empty
  87 #               then all tags are removed from the text.
  88
  89 proc insertWithTags {w text args} {
  90     set start [$w index insert]
  91     $w insert insert $text
  92     foreach tag [$w tag names $start] {
  93         $w tag remove $tag $start insert
  94     }
  95     foreach i $args {
  96         $w tag add $i $start insert
  97     }
  98 }