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