~ubuntu-branches/ubuntu/hardy/ruby1.8/hardy-updates

'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)

100

$ruler_canvas\

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.addtag_withtag($rulerTag_well,

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TkcRectangle.new($ruler_canvas,

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'13.2c', '1c', '13.8c', '0.5c',

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'outline'=>'black',

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'fill'=>($ruler_canvas\

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.configinfo('background'))[4]) )

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$ruler_canvas\

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.addtag_withtag($rulerTag_well,

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rulerMkTab($ruler_canvas,

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TkWinfo.pixels($ruler_canvas, '13.5c'),

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TkWinfo.pixels($ruler_canvas, '.65c') ) )

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$rulerTag_well.bind('1', proc{|x,y| rulerNewTab($ruler_canvas,x,y)}, '%x %y')

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$ruler_canvas.itembind('tab', '1',

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proc{|x,y| rulerSelectTab($ruler_canvas,x,y)}, '%x %y')

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$ruler_canvas.bind('B1-Motion',

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proc{|x,y| rulerMoveTab($ruler_canvas,x,y)}, '%x %y')

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$ruler_canvas.bind('Any-ButtonRelease-1', proc{rulerReleaseTab($ruler_canvas)})

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# rulerNewTab --

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# Does all the work of creating a tab stop, including creating the

122

# triangle object and adding tags to it to give it tab behavior.

123

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# Arguments:

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# c - The canvas window.

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# x, y - The coordinates of the tab stop.

127

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def rulerNewTab(c,x,y)

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v = $demo_rulerInfo

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c.addtag_withtag('active', rulerMkTab(c,x,y))

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c.addtag_withtag('tab', 'active')

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v.x = x

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v.y = y

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rulerMoveTab(c,x,y)

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end

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# rulerSelectTab --

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# This method is invoked when mouse button 1 is pressed over

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# a tab. It remembers information about the tab so that it can

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# be dragged interactively.

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# Arguments:

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# c - The canvas widget.

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# x, y - The coordinates of the mouse (identifies the point by

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# which the tab was picked up for dragging).

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def rulerSelectTab(c,x,y)

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v = $demo_rulerInfo

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v.x = c.canvasx(x, v.grid)

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v.y = v.top+2

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c.addtag_withtag('active', 'current')

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c.itemconfigure('active', v.activeStyle)

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c.raise('active')

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end

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# rulerMoveTab --

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# This method is invoked during mouse motion events to drag a tab.

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# It adjusts the position of the tab, and changes its appearance if

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# it is about to be dragged out of the ruler.

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# Arguments:

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# c - The canvas widget.

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# x, y - The coordinates of the mouse.

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def rulerMoveTab(c,x,y)

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v = $demo_rulerInfo

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return if c.find_withtag('active') == []

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cx = c.canvasx(x,v.grid)

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cy = c.canvasy(y)

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cx = v.left if cx < v.left

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cx = v.right if cx > v.right

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if (cy >= v.top && cy <= v.bottom)

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cy = v.top+2

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c.itemconfigure('active', v.activeStyle)

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else

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cy = cy-v.size-2

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c.itemconfigure('active', v.deleteStyle)

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end

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c.move('active', cx-v.x, cy-v.y)

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v.x = cx

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v.y = cy

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end

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# rulerReleaseTab --

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# This method is invoked during button release events that end

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# a tab drag operation. It deselects the tab and deletes the tab if

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# it was dragged out of the ruler.

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# Arguments:

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# c - The canvas widget.

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# x, y - The coordinates of the mouse.

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def rulerReleaseTab(c)

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v = $demo_rulerInfo

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return if c.find_withtag('active') == []

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if v.y != v.top+2

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c.delete('active')

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else

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c.itemconfigure('active', v.normalStyle)

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c.dtag('active')

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end

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end

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