1# ctext.tcl -- 2# 3# This demonstration script creates a canvas widget with a text 4# item that can be edited and reconfigured in various ways. 5 6if {![info exists widgetDemo]} { 7 error "This script should be run from the \"widget\" demo." 8} 9 10package require Tk 11 12set w .ctext 13catch {destroy $w} 14toplevel $w 15wm title $w "Canvas Text Demonstration" 16wm iconname $w "Text" 17positionWindow $w 18set c $w.c 19 20label $w.msg -font $font -wraplength 5i -justify left -text "This window displays a string of text to demonstrate the text facilities of canvas widgets. You can click in the boxes to adjust the position of the text relative to its positioning point or change its justification, and on a pie slice to change its angle. The text also supports the following simple bindings for editing: 21 1. You can point, click, and type. 22 2. You can also select with button 1. 23 3. You can copy the selection to the mouse position with button 2. 24 4. Backspace and Control+h delete the selection if there is one; 25 otherwise they delete the character just before the insertion cursor. 26 5. Delete deletes the selection if there is one; otherwise it deletes 27 the character just after the insertion cursor." 28pack $w.msg -side top 29 30## See Code / Dismiss buttons 31set btns [addSeeDismiss $w.buttons $w] 32pack $btns -side bottom -fill x 33 34canvas $c -relief flat -borderwidth 0 -width 500 -height 350 35pack $w.c -side top -expand yes -fill both 36 37set textFont {Helvetica 24} 38 39$c create rectangle 245 195 255 205 -outline black -fill red 40 41# First, create the text item and give it bindings so it can be edited. 42 43$c addtag text withtag [$c create text 250 200 -text "This is just a string of text to demonstrate the text facilities of canvas widgets. Bindings have been defined to support editing (see above)." -width 440 -anchor n -font $textFont -justify left] 44$c bind text <Button-1> "textB1Press $c %x %y" 45$c bind text <B1-Motion> "textB1Move $c %x %y" 46$c bind text <Shift-Button-1> "$c select adjust current @%x,%y" 47$c bind text <Shift-B1-Motion> "textB1Move $c %x %y" 48$c bind text <Key> "textInsert $c %A" 49$c bind text <Return> "textInsert $c \\n" 50$c bind text <Control-h> "textBs $c" 51$c bind text <BackSpace> "textBs $c" 52$c bind text <Delete> "textDel $c" 53if {[tk windowingsystem] eq "aqua" && ![package vsatisfies [package provide Tk] 8.7-]} { 54 $c bind text <Button-3> "textPaste $c @%x,%y" 55} else { 56 $c bind text <Button-2> "textPaste $c @%x,%y" 57} 58 59# Next, create some items that allow the text's anchor position 60# to be edited. 61 62proc mkTextConfigBox {w x y option value color} { 63 set item [$w create rect $x $y [expr {$x+30}] [expr {$y+30}] \ 64 -outline black -fill $color -width 1] 65 $w bind $item <Button-1> "$w itemconf text $option $value" 66 $w addtag config withtag $item 67} 68proc mkTextConfigPie {w x y a option value color} { 69 set item [$w create arc $x $y [expr {$x+90}] [expr {$y+90}] \ 70 -start [expr {$a-15}] -extent 30 -outline black -fill $color \ 71 -width 1] 72 $w bind $item <Button-1> "$w itemconf text $option $value" 73 $w addtag config withtag $item 74} 75 76set x 50 77set y 50 78set color LightSkyBlue1 79mkTextConfigBox $c $x $y -anchor se $color 80mkTextConfigBox $c [expr {$x+30}] [expr {$y }] -anchor s $color 81mkTextConfigBox $c [expr {$x+60}] [expr {$y }] -anchor sw $color 82mkTextConfigBox $c [expr {$x }] [expr {$y+30}] -anchor e $color 83mkTextConfigBox $c [expr {$x+30}] [expr {$y+30}] -anchor center $color 84mkTextConfigBox $c [expr {$x+60}] [expr {$y+30}] -anchor w $color 85mkTextConfigBox $c [expr {$x }] [expr {$y+60}] -anchor ne $color 86mkTextConfigBox $c [expr {$x+30}] [expr {$y+60}] -anchor n $color 87mkTextConfigBox $c [expr {$x+60}] [expr {$y+60}] -anchor nw $color 88set item [$c create rect \ 89 [expr {$x+40}] [expr {$y+40}] [expr {$x+50}] [expr {$y+50}] \ 90 -outline black -fill red] 91$c bind $item <Button-1> "$c itemconf text -anchor center" 92$c create text [expr {$x+45}] [expr {$y-5}] \ 93 -text {Text Position} -anchor s -font {Times 20} -fill brown 94 95# Now create some items that allow the text's angle to be changed. 96 97set x 205 98set y 50 99set color Yellow 100mkTextConfigPie $c $x $y 0 -angle 90 $color 101mkTextConfigPie $c $x $y 30 -angle 120 $color 102mkTextConfigPie $c $x $y 60 -angle 150 $color 103mkTextConfigPie $c $x $y 90 -angle 180 $color 104mkTextConfigPie $c $x $y 120 -angle 210 $color 105mkTextConfigPie $c $x $y 150 -angle 240 $color 106mkTextConfigPie $c $x $y 180 -angle 270 $color 107mkTextConfigPie $c $x $y 210 -angle 300 $color 108mkTextConfigPie $c $x $y 240 -angle 330 $color 109mkTextConfigPie $c $x $y 270 -angle 0 $color 110mkTextConfigPie $c $x $y 300 -angle 30 $color 111mkTextConfigPie $c $x $y 330 -angle 60 $color 112$c create text [expr {$x+45}] [expr {$y-5}] \ 113 -text {Text Angle} -anchor s -font {Times 20} -fill brown 114 115# Lastly, create some items that allow the text's justification to be 116# changed. 117 118set x 350 119set y 50 120set color SeaGreen2 121mkTextConfigBox $c $x $y -justify left $color 122mkTextConfigBox $c [expr {$x+30}] $y -justify center $color 123mkTextConfigBox $c [expr {$x+60}] $y -justify right $color 124$c create text [expr {$x+45}] [expr {$y-5}] \ 125 -text {Justification} -anchor s -font {Times 20} -fill brown 126 127$c bind config <Enter> "textEnter $c" 128$c bind config <Leave> "$c itemconf current -fill \$textConfigFill" 129 130set textConfigFill {} 131 132proc textEnter {w} { 133 global textConfigFill 134 set textConfigFill [lindex [$w itemconfig current -fill] 4] 135 $w itemconfig current -fill black 136} 137 138proc textInsert {w string} { 139 if {$string == ""} { 140 return 141 } 142 catch {$w dchars text sel.first sel.last} 143 $w insert text insert $string 144} 145 146proc textPaste {w pos} { 147 catch { 148 $w insert text $pos [selection get] 149 } 150} 151 152proc textB1Press {w x y} { 153 $w icursor current @$x,$y 154 $w focus current 155 focus $w 156 $w select from current @$x,$y 157} 158 159proc textB1Move {w x y} { 160 $w select to current @$x,$y 161} 162 163proc textBs {w} { 164 if {![catch {$w dchars text sel.first sel.last}]} { 165 return 166 } 167 set char [expr {[$w index text insert] - 1}] 168 if {$char >= 0} {$w dchar text $char} 169} 170 171proc textDel {w} { 172 if {![catch {$w dchars text sel.first sel.last}]} { 173 return 174 } 175 $w dchars text insert 176} 177