206 lines
6.5 KiB
Ruby
206 lines
6.5 KiB
Ruby
# ruler.rb
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#
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# This demonstration script creates a canvas widget that displays a ruler
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# with tab stops that can be set, moved, and deleted.
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#
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# ruler widget demo (called by 'widget')
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#
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# rulerMkTab --
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# This method creates a new triangular polygon in a canvas to
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# represent a tab stop.
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#
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# Arguments:
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# c - The canvas window.
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# x, y - Coordinates at which to create the tab stop.
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def rulerMkTab(c,x,y)
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v = $demo_rulerInfo
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TkcPolygon.new(c, x, y, x+v.size, y+v.size, x-v.size, y+v.size)
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end
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# toplevel widget
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if defined?($ruler_demo) && $ruler_demo
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$ruler_demo.destroy
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$ruler_demo = nil
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end
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# demo toplevel widget
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$ruler_demo = TkToplevel.new {|w|
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title("Ruler Demonstration")
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iconname("ruler")
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positionWindow(w)
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}
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base_frame = TkFrame.new($ruler_demo).pack(:fill=>:both, :expand=>true)
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# label
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TkLabel.new(base_frame, 'font'=>$font, 'wraplength'=>'5i', 'justify'=>'left',
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'text'=>"This 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."){
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pack('side'=>'top')
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}
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# frame
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$ruler_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 = $ruler_demo
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$ruler_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 'ruler'}
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}.pack('side'=>'left', 'expand'=>'yes')
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}
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$ruler_buttons.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
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# canvas
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$ruler_canvas = TkCanvas.new(base_frame, 'width'=>'14.8c', 'height'=>'2.5c')
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$ruler_canvas.pack('side'=>'top', 'fill'=>'x')
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#
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unless Struct.const_defined?("RulerInfo")
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$demo_rulerInfo = Struct.new("RulerInfo", :grid, :left, :right, :x, :y,
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:top, :bottom, :size, :normalStyle,
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:activeStyle, :deleteStyle).new
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end
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$demo_rulerInfo.grid = '.25c'
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$demo_rulerInfo.left = TkWinfo.fpixels($ruler_canvas, '1c')
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$demo_rulerInfo.right = TkWinfo.fpixels($ruler_canvas, '13c')
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$demo_rulerInfo.top = TkWinfo.fpixels($ruler_canvas, '1c')
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$demo_rulerInfo.bottom = TkWinfo.fpixels($ruler_canvas, '1.5c')
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$demo_rulerInfo.size = TkWinfo.fpixels($ruler_canvas, '.2c')
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$demo_rulerInfo.normalStyle = {'fill'=>'black'}
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if TkWinfo.depth($ruler_canvas) > 1
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$demo_rulerInfo.activeStyle = {'fill'=>'red', 'stipple'=>''}
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$demo_rulerInfo.deleteStyle = {'fill'=>'red',
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'stipple'=>'@'+[$demo_dir, '..',
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'images', 'gray25.xbm'].join(File::Separator)}
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else
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$demo_rulerInfo.activeStyle = {'fill'=>'black', 'stipple'=>''}
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$demo_rulerInfo.deleteStyle = {'fill'=>'black',
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'stipple'=>'@'+[$demo_dir, '..',
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'images', 'gray25.xbm'].join(File::Separator)}
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end
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TkcLine.new($ruler_canvas,
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'1c', '0.5c', '1c', '1c', '13c', '1c', '13c', '0.5c', 'width'=>1)
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(0..11).each{|i|
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x = i+1
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TkcLine.new($ruler_canvas, "#{x}c", '1c', "#{x}c", '0.6c', 'width'=>1)
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TkcLine.new($ruler_canvas, "#{x}.25c", '1c', "#{x}.25c", '0.8c', 'width'=>1)
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TkcLine.new($ruler_canvas, "#{x}.5c", '1c', "#{x}.5c", '0.7c', 'width'=>1)
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TkcLine.new($ruler_canvas, "#{x}.75c", '1c', "#{x}.75c", '0.8c', 'width'=>1)
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TkcText.new($ruler_canvas, "#{x}.15c", '0.75c', 'text'=>i, 'anchor'=>'sw')
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}
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$rulerTag_well = TkcTag.new($ruler_canvas)
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$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
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# triangle object and adding tags to it to give it tab behavior.
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#
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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.
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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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#
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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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#
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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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#
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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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