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# ctext.rb
#
# This demonstration script creates a canvas widget with a text
# item that can be edited and reconfigured in various ways.
#
# Canvas Text widget demo (called by 'widget')
#
# toplevel widget
if defined?($ctext_demo) && $ctext_demo
$ctext_demo.destroy
$ctext_demo = nil
end
# demo toplevel widget
$ctext_demo = TkToplevel.new {|w|
title("Canvas Text Demonstration")
iconname("Text")
positionWindow(w)
}
base_frame = TkFrame.new($ctext_demo).pack(:fill=>:both, :expand=>true)
# label
TkLabel.new(base_frame, '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. The text also supports the following simple bindings for editing:
1. You can point, click, and type.
2. You can also select with button 1.
3. You can copy the selection to the mouse position with button 2.
4. Backspace and Control+h delete the selection if there is one;
otherwise they delete the character just before the insertion cursor.
5. Delete deletes the selection if there is one; otherwise it deletes
the character just after the insertion cursor."){
pack('side'=>'top')
}
# frame
$ctext_buttons = TkFrame.new(base_frame) {|frame|
TkButton.new(frame) {
text 'Dismiss'
command proc{
tmppath = $ctext_demo
$ctext_demo = nil
tmppath.destroy
}
}.pack('side'=>'left', 'expand'=>'yes')
TkButton.new(frame) {
text 'Show Code'
command proc{showCode 'ctext'}
}.pack('side'=>'left', 'expand'=>'yes')
}
$ctext_buttons.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
# canvas
$ctext_canvas = TkCanvas.new(base_frame, 'relief'=>'flat',
'borderwidth'=>0, 'width'=>500, 'height'=>350)
$ctext_canvas.pack('side'=>'top', 'expand'=>'yes', 'fill'=>'both')
# font
if $tk_version =~ /^4.*/
textFont = '-*-Helvetica-Medium-R-Normal--*-240-*-*-*-*-*-*'
else
textFont = 'Helvetica 24'
end
# canvas
TkcRectangle.new($ctext_canvas, 245, 195, 255, 205,
'outline'=>'black', 'fill'=>'red')
ctag_text_param = {
'text'=>"This is just a string of text to demonstrate the text facilities of canvas widgets. Bindings have been been defined to support editing (see above).",
'width'=>440, 'anchor'=>'n', 'justify'=>'left'
}
if $tk_version =~ /^4.*/
ctag_text_param['font'] = '-*-Helvetica-Medium-R-Normal--*-240-*-*-*-*-*-*'
else
ctag_text_param['font'] = 'Helvetica 24'
end
$ctag_text = TkcTag.new($ctext_canvas)
$ctag_text.withtag(TkcText.new($ctext_canvas, 250, 200, ctag_text_param))
$ctag_text.bind('1', proc{|x,y| textB1Press $ctext_canvas,x,y}, "%x %y")
$ctag_text.bind('B1-Motion', proc{|x,y| textB1Move $ctext_canvas,x,y}, "%x %y")
$ctag_text.bind('Shift-1',
proc{|x,y| $ctext_canvas.seleect_adjust 'current', "@#{x},#{y}"},
"%x %y")
$ctag_text.bind('Shift-B1-Motion',
proc{|x,y| textB1Move $ctext_canvas,x,y}, "%x %y")
$ctag_text.bind('KeyPress', proc{|a| textInsert $ctext_canvas,a}, "%A")
$ctag_text.bind('Return', proc{textInsert $ctext_canvas,"\n"})
$ctag_text.bind('Control-h', proc{textBs $ctext_canvas})
$ctag_text.bind('BackSpace', proc{textBs $ctext_canvas})
$ctag_text.bind('Delete', proc{textDel $ctext_canvas})
$ctag_text.bind('2', proc{|x,y| textPaste $ctext_canvas, "@#{x},#{y}"},
"%x %y")
# Next, create some items that allow the text's anchor position
# to be edited.
def mkTextConfig(w,x,y,option,value,color)
item = TkcRectangle.new(w, x, y, x+30, y+30,
'outline'=>'black', 'fill'=>color, 'width'=>1)
item.bind('1', proc{$ctag_text.configure option, value})
w.addtag_withtag('config', item)
end
x = 50
y = 50
color = 'LightSkyBlue1'
mkTextConfig $ctext_canvas, x, y, 'anchor', 'se', color
mkTextConfig $ctext_canvas, x+30, y, 'anchor', 's', color
mkTextConfig $ctext_canvas, x+60, y, 'anchor', 'sw', color
mkTextConfig $ctext_canvas, x, y+30, 'anchor', 'e', color
mkTextConfig $ctext_canvas, x+30, y+30, 'anchor', 'center', color
mkTextConfig $ctext_canvas, x+60, y+30, 'anchor', 'w', color
mkTextConfig $ctext_canvas, x, y+60, 'anchor', 'ne', color
mkTextConfig $ctext_canvas, x+30, y+60, 'anchor', 'n', color
mkTextConfig $ctext_canvas, x+60, y+60, 'anchor', 'nw', color
item = TkcRectangle.new($ctext_canvas, x+40, y+40, x+50, y+50,
'outline'=>'black', 'fill'=>'red')
item.bind('1', proc{$ctag_text.configure 'anchor', 'center'})
if $tk_version =~ /^4.*/
TkcText.new($ctext_canvas, x+45, y-5, 'text'=>'Text Position',
'font'=>'-*-times-medium-r-normal--*-240-*-*-*-*-*-*',
'anchor'=>'s', 'fill'=>'brown')
else
TkcText.new($ctext_canvas, x+45, y-5, 'text'=>'Text Position',
'font'=>'Times 24', 'anchor'=>'s', 'fill'=>'brown')
end
# Lastly, create some items that allow the text's justification to be
# changed.
x = 350
y = 50
color = 'SeaGreen2'
mkTextConfig $ctext_canvas, x, y, 'justify', 'left', color
mkTextConfig $ctext_canvas, x+30, y, 'justify', 'center', color
mkTextConfig $ctext_canvas, x+60, y, 'justify', 'right', color
if $tk_version =~ /^4.*/
TkcText.new($ctext_canvas, x+45, y-5, 'text'=>'Justification',
'font'=>'-*-times-medium-r-normal--*-240-*-*-*-*-*-*',
'anchor'=>'s', 'fill'=>'brown')
else
TkcText.new($ctext_canvas, x+45, y-5, 'text'=>'Justification',
'font'=>'Times 24', 'anchor'=>'s', 'fill'=>'brown')
end
$ctext_canvas.itembind('config', 'Enter', proc{textEnter $ctext_canvas})
$ctext_canvas.itembind('config', 'Leave',
proc{$ctext_canvas\
.itemconfigure('current',
'fill'=>$textConfigFill)})
$textConfigFill = ''
def textEnter(w)
$textConfigFill = (w.itemconfiginfo 'current', 'fill')[4]
w.itemconfigure 'current', 'fill', 'black'
end
def textInsert(w, string)
return if string == ""
begin
$ctag_text.dchars 'sel.first', 'sel.last'
rescue
end
$ctag_text.insert 'insert', string
end
def textPaste(w, pos)
begin
$ctag_text.insert pos, TkSelection.get
rescue
end
end
def textB1Press(w,x,y)
w.icursor 'current', "@#{x},#{y}"
w.itemfocus 'current'
w.focus
w.select_from 'current', "@#{x},#{y}"
end
def textB1Move(w,x,y)
w.select_to 'current', "@#{x},#{y}"
end
def textBs(w)
begin
$ctag_text.dchars 'sel.first', 'sel.last'
rescue
char = $ctag_text.index('insert').to_i - 1
$ctag_text.dchars(char) if char >= 0
end
end
def textDel(w)
begin
$ctag_text.dchars 'sel.first', 'sel.last'
rescue
$ctag_text.dchars 'insert'
end
end
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