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

   1 # text.tcl --
   2 #
   3 # This demonstration script creates a text widget that describes
   4 # the basic editing functions.
   5
   6 if {![info exists widgetDemo]} {
   7     error "This script should be run from the \"widget\" demo."
   8 }
   9
  10 package require Tk
  11
  12 set w .text
  13 catch {destroy $w}
  14 toplevel $w
  15 wm title $w "Text Demonstration - Basic Facilities"
  16 wm iconname $w "text"
  17 positionWindow $w
  18
  19 ## See Code / Dismiss buttons
  20 set btns [addSeeDismiss $w.buttons $w]
  21 pack $btns -side bottom -fill x
  22
  23 text $w.text -yscrollcommand [list $w.scroll set] -setgrid 1 \
  24         -height 30 -undo 1 -autosep 1
  25 scrollbar $w.scroll -command [list $w.text yview]
  26 pack $w.scroll -side right -fill y
  27 pack $w.text -expand yes -fill both
  28 $w.text insert 0.0 \
  29 {This window is a text widget.  It displays one or more lines of text
  30 and allows you to edit the text.  Here is a summary of the things you
  31 can do to a text widget:
  32
  33 1. Scrolling. Use the scrollbar to adjust the view in the text window.
  34
  35 2. Scanning. Press mouse button 2 in the text window and drag up or down.
  36 This will drag the text at high speed to allow you to scan its contents.
  37
  38 3. Insert text. Press mouse button 1 to set the insertion cursor, then
  39 type text.  What you type will be added to the widget.
  40
  41 4. Select. Press mouse button 1 and drag to select a range of characters.
  42 Once you've released the button, you can adjust the selection by pressing
  43 button 1 with the shift key down.  This will reset the end of the
  44 selection nearest the mouse cursor and you can drag that end of the
  45 selection by dragging the mouse before releasing the mouse button.
  46 You can double-click to select whole words or triple-click to select
  47 whole lines.
  48
  49 5. Delete and replace. To delete text, select the characters you'd like
  50 to delete and type Backspace or Delete.  Alternatively, you can type new
  51 text, in which case it will replace the selected text.
  52
  53 6. Copy the selection. To copy the selection into this window, select
  54 what you want to copy (either here or in another application), then
  55 click button 2 to copy the selection to the point of the mouse cursor.
  56
  57 7. Edit.  Text widgets support the standard Motif editing characters
  58 plus many Emacs editing characters.  Backspace and Control-h erase the
  59 character to the left of the insertion cursor.  Delete and Control-d
  60 erase the character to the right of the insertion cursor.  Meta-backspace
  61 deletes the word to the left of the insertion cursor, and Meta-d deletes
  62 the word to the right of the insertion cursor.  Control-k deletes from
  63 the insertion cursor to the end of the line, or it deletes the newline
  64 character if that is the only thing left on the line.  Control-o opens
  65 a new line by inserting a newline character to the right of the insertion
  66 cursor.  Control-t transposes the two characters on either side of the
  67 insertion cursor.  Control-z undoes the last editing action performed,
  68 and }
  69
  70 switch $tcl_platform(platform) {
  71     "unix" {
  72         $w.text insert end "Control-Shift-z"
  73     }
  74     "windows" {
  75         $w.text insert end "Control-y"
  76     }
  77 }
  78
  79 $w.text insert end { redoes undone edits.
  80
  81 7. Resize the window.  This widget has been configured with the "setGrid"
  82 option on, so that if you resize the window it will always resize to an
  83 even number of characters high and wide.  Also, if you make the window
  84 narrow you can see that long lines automatically wrap around onto
  85 additional lines so that all the information is always visible.}
  86 $w.text mark set insert 0.0