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# cscroll.rb
#
# This demonstration script creates a simple canvas that can be
# scrolled in two dimensions.
#
# simple scrollable canvas widget demo (called by 'widget')
#
# toplevel widget
if defined?($cscroll_demo) && $cscroll_demo
$cscroll_demo.destroy
$cscroll_demo = nil
end
# demo toplevel widget
$cscroll_demo = TkToplevel.new {|w|
title("Scrollable Canvas Demonstration")
iconname("cscroll")
positionWindow(w)
}
# label
TkLabel.new($cscroll_demo, 'font'=>$font, 'wraplength'=>'4i',
'justify'=>'left', 'text'=>"This window displays a canvas widget that can be scrolled either using the scrollbars or by dragging with button 2 in the canvas. If you click button 1 on one of the rectangles, its indices will be printed on stdout."){
pack('side'=>'top')
}
# frame
$cscroll_buttons = TkFrame.new($cscroll_demo) {|frame|
TkButton.new(frame) {
text 'Dismiss'
command proc{
tmppath = $cscroll_demo
$cscroll_demo = nil
tmppath.destroy
}
}.pack('side'=>'left', 'expand'=>'yes')
TkButton.new(frame) {
text 'Show Code'
command proc{showCode 'cscroll'}
}.pack('side'=>'left', 'expand'=>'yes')
}
$cscroll_buttons.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
# frame
unless $tk_version =~ /^4\.[01]/
$cscroll_grid = TkFrame.new($cscroll_demo) {
pack('expand'=>'yes', 'fill'=>'both', 'padx'=>1, 'pady'=>1)
}
TkGrid.rowconfigure($cscroll_grid, 0, 'weight'=>1, 'minsize'=>0)
TkGrid.columnconfigure($cscroll_grid, 0, 'weight'=>1, 'minsize'=>0)
end
# canvas
$cscroll_canvas = TkCanvas.new($cscroll_demo,
'relief'=>'sunken', 'borderwidth'=>2,
'scrollregion'=>['-11c', '-11c', '50c', '20c']
) {|c|
if $tk_version =~ /^4\.[01]/
pack('expand'=>'yes', 'fill'=>'both')
else
grid('in'=>$cscroll_grid, 'padx'=>1, 'pady'=>1, 'row'=>0, 'column'=>0,
'rowspan'=>1, 'columnspan'=>1, 'sticky'=>'news')
end
TkScrollbar.new($cscroll_demo, 'command'=>proc{|*args| c.yview(*args)}) {|vs|
c.yscrollcommand(proc{|first,last| vs.set first,last})
if $tk_version =~ /^4\.[01]/
pack('side'=>'right', 'fill'=>'y')
else
grid('in'=>$cscroll_grid, 'padx'=>1, 'pady'=>1, 'row'=>0, 'column'=>1,
'rowspan'=>1, 'columnspan'=>1, 'sticky'=>'news')
end
}
TkScrollbar.new($cscroll_demo, 'orient'=>'horiz',
'command'=>proc{|*args| c.xview(*args)}) {|hs|
c.xscrollcommand(proc{|first,last| hs.set first,last})
if $tk_version =~ /^4\.[01]/
pack('side'=>'bottom', 'fill'=>'x')
else
grid('in'=>$cscroll_grid, 'padx'=>1, 'pady'=>1, 'row'=>1, 'column'=>0,
'rowspan'=>1, 'columnspan'=>1, 'sticky'=>'news')
end
}
}
bg = $cscroll_canvas.configinfo('bg')[4]
(0..19).each{|i|
x = -10+3*i
y = -10
(0..9).each{|j|
TkcRectangle.new($cscroll_canvas, "#{x}c", "#{y}c", "#{x+2}c", "#{y+2}c",
'outline'=>'black', 'fill'=>bg, 'tags'=>'rect')
TkcText.new($cscroll_canvas, "#{x+1}c", "#{y+1}c",
'text'=>"#{i},#{j}", 'anchor'=>'center', 'tags'=>'text')
y += 3
}
}
$cscroll_canvas.itembind('all', 'Any-Enter', proc{scrollEnter $cscroll_canvas})
$cscroll_canvas.itembind('all', 'Any-Leave', proc{scrollLeave $cscroll_canvas})
$cscroll_canvas.itembind('all', '1', proc{scrollButton $cscroll_canvas})
$cscroll_canvas.itembind('all', 'Any-Enter', proc{scrollEnter $cscroll_canvas})
$cscroll_canvas.bind('2', proc{|x,y| $cscroll_canvas.scan_mark(x,y)}, '%x %y')
$cscroll_canvas.bind('B2-Motion',
proc{|x,y| $cscroll_canvas.scan_dragto(x,y)}, '%x %y')
def scrollEnter(c)
id = c.find_withtag('current')[0].id
id -= 1 if c.gettags('current').include?('text')
$oldFill = c.itemconfiginfo(id, 'fill')[4]
if TkWinfo.depth(c) > 1
c.itemconfigure(id, 'fill'=>'SeaGreen1')
else
c.itemconfigure(id, 'fill'=>'black')
c.itemconfigure(id+1, 'fill'=>'white')
end
end
def scrollLeave(c)
id = c.find_withtag('current')[0].id
id -= 1 if c.gettags('current').include?('text')
c.itemconfigure(id, 'fill'=>$oldFill)
c.itemconfigure(id+1, 'fill'=>'black')
end
def scrollButton(c)
id = c.find_withtag('current')[0].id
id += 1 unless c.gettags('current').include?('text')
print "You buttoned at #{c.itemconfiginfo(id,'text')[4]}\n"
end
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