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# ruler.rb
#
# This demonstration script creates a canvas widget that displays a ruler
# with tab stops that can be set, moved, and deleted.
#
# ruler widget demo (called by 'widget')
#
# rulerMkTab --
# This method creates a new triangular polygon in a canvas to
# represent a tab stop.
#
# Arguments:
# c - The canvas window.
# x, y - Coordinates at which to create the tab stop.
def rulerMkTab(c,x,y)
v = $demo_rulerInfo
TkcPolygon.new(c, x, y, x+v.size, y+v.size, x-v.size, y+v.size)
end
# toplevel widget
if defined?($ruler_demo) && $ruler_demo
$ruler_demo.destroy
$ruler_demo = nil
end
# demo toplevel widget
$ruler_demo = TkToplevel.new {|w|
title("Ruler Demonstration")
iconname("ruler")
positionWindow(w)
}
# label
TkLabel.new($ruler_demo, 'font'=>$font, 'wraplength'=>'5i', 'justify'=>'left',
'text'=>"This canvas widget shows a mock-up of a ruler. You can create tab stops by dragging them out of the well to the right of the ruler. You can also drag existing tab stops. If you drag a tab stop far enough up or down so that it turns dim, it will be deleted when you release the mouse button."){
pack('side'=>'top')
}
# frame
$ruler_buttons = TkFrame.new($ruler_demo) {|frame|
TkButton.new(frame) {
text 'Dismiss'
command proc{
tmppath = $ruler_demo
$ruler_demo = nil
tmppath.destroy
}
}.pack('side'=>'left', 'expand'=>'yes')
TkButton.new(frame) {
text 'Show Code'
command proc{showCode 'ruler'}
}.pack('side'=>'left', 'expand'=>'yes')
}
$ruler_buttons.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
# canvas
$ruler_canvas = TkCanvas.new($ruler_demo, 'width'=>'14.8c', 'height'=>'2.5c')
$ruler_canvas.pack('side'=>'top', 'fill'=>'x')
#
unless Struct.const_defined?("RulerInfo")
$demo_rulerInfo = Struct.new("RulerInfo", :grid, :left, :right, :x, :y,
:top, :bottom, :size, :normalStyle,
:activeStyle, :deleteStyle).new
end
$demo_rulerInfo.grid = '.25c'
$demo_rulerInfo.left = TkWinfo.fpixels($ruler_canvas, '1c')
$demo_rulerInfo.right = TkWinfo.fpixels($ruler_canvas, '13c')
$demo_rulerInfo.top = TkWinfo.fpixels($ruler_canvas, '1c')
$demo_rulerInfo.bottom = TkWinfo.fpixels($ruler_canvas, '1.5c')
$demo_rulerInfo.size = TkWinfo.fpixels($ruler_canvas, '.2c')
$demo_rulerInfo.normalStyle = {'fill'=>'black'}
if TkWinfo.depth($ruler_canvas) > 1
$demo_rulerInfo.activeStyle = {'fill'=>'red', 'stipple'=>''}
$demo_rulerInfo.deleteStyle = {'fill'=>'red',
'stipple'=>'@'+[$demo_dir, '..',
'images', 'gray25.xbm'].join(File::Separator)}
else
$demo_rulerInfo.activeStyle = {'fill'=>'black', 'stipple'=>''}
$demo_rulerInfo.deleteStyle = {'fill'=>'black',
'stipple'=>'@'+[$demo_dir, '..',
'images', 'gray25.xbm'].join(File::Separator)}
end
TkcLine.new($ruler_canvas,
'1c', '0.5c', '1c', '1c', '13c', '1c', '13c', '0.5c', 'width'=>1)
(0..11).each{|i|
x = i+1
TkcLine.new($ruler_canvas, "#{x}c", '1c', "#{x}c", '0.6c', 'width'=>1)
TkcLine.new($ruler_canvas, "#{x}.25c", '1c', "#{x}.25c", '0.8c', 'width'=>1)
TkcLine.new($ruler_canvas, "#{x}.5c", '1c', "#{x}.5c", '0.7c', 'width'=>1)
TkcLine.new($ruler_canvas, "#{x}.75c", '1c', "#{x}.75c", '0.8c', 'width'=>1)
TkcText.new($ruler_canvas, "#{x}.15c", '0.75c', 'text'=>i, 'anchor'=>'sw')
}
$rulerTag_well = TkcTag.new($ruler_canvas)
$ruler_canvas\
.addtag_withtag($rulerTag_well,
TkcRectangle.new($ruler_canvas,
'13.2c', '1c', '13.8c', '0.5c',
'outline'=>'black',
'fill'=>($ruler_canvas\
.configinfo('background'))[4]) )
$ruler_canvas\
.addtag_withtag($rulerTag_well,
rulerMkTab($ruler_canvas,
TkWinfo.pixels($ruler_canvas, '13.5c'),
TkWinfo.pixels($ruler_canvas, '.65c') ) )
$rulerTag_well.bind('1', proc{|x,y| rulerNewTab($ruler_canvas,x,y)}, '%x %y')
$ruler_canvas.itembind('tab', '1',
proc{|x,y| rulerSelectTab($ruler_canvas,x,y)}, '%x %y')
$ruler_canvas.bind('B1-Motion',
proc{|x,y| rulerMoveTab($ruler_canvas,x,y)}, '%x %y')
$ruler_canvas.bind('Any-ButtonRelease-1', proc{rulerReleaseTab($ruler_canvas)})
# rulerNewTab --
# Does all the work of creating a tab stop, including creating the
# triangle object and adding tags to it to give it tab behavior.
#
# Arguments:
# c - The canvas window.
# x, y - The coordinates of the tab stop.
def rulerNewTab(c,x,y)
v = $demo_rulerInfo
c.addtag_withtag('active', rulerMkTab(c,x,y))
c.addtag_withtag('tab', 'active')
v.x = x
v.y = y
rulerMoveTab(c,x,y)
end
# rulerSelectTab --
# This method is invoked when mouse button 1 is pressed over
# a tab. It remembers information about the tab so that it can
# be dragged interactively.
#
# Arguments:
# c - The canvas widget.
# x, y - The coordinates of the mouse (identifies the point by
# which the tab was picked up for dragging).
def rulerSelectTab(c,x,y)
v = $demo_rulerInfo
v.x = c.canvasx(x, v.grid)
v.y = v.top+2
c.addtag_withtag('active', 'current')
c.itemconfigure('active', v.activeStyle)
c.raise('active')
end
# rulerMoveTab --
# This method is invoked during mouse motion events to drag a tab.
# It adjusts the position of the tab, and changes its appearance if
# it is about to be dragged out of the ruler.
#
# Arguments:
# c - The canvas widget.
# x, y - The coordinates of the mouse.
def rulerMoveTab(c,x,y)
v = $demo_rulerInfo
return if c.find_withtag('active') == []
cx = c.canvasx(x,v.grid)
cy = c.canvasy(y)
cx = v.left if cx < v.left
cx = v.right if cx > v.right
if (cy >= v.top && cy <= v.bottom)
cy = v.top+2
c.itemconfigure('active', v.activeStyle)
else
cy = cy-v.size-2
c.itemconfigure('active', v.deleteStyle)
end
c.move('active', cx-v.x, cy-v.y)
v.x = cx
v.y = cy
end
# rulerReleaseTab --
# This method is invoked during button release events that end
# a tab drag operation. It deselects the tab and deletes the tab if
# it was dragged out of the ruler.
#
# Arguments:
# c - The canvas widget.
# x, y - The coordinates of the mouse.
def rulerReleaseTab(c)
v = $demo_rulerInfo
return if c.find_withtag('active') == []
if v.y != v.top+2
c.delete('active')
else
c.itemconfigure('active', v.normalStyle)
c.dtag('active')
end
end
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