Class: Tk::Tooltip

Inherits:
Struct
  • Object
show all
Defined in:
lib/ver/tooltip.rb

Overview

Translation from Tcl: wiki.tcl.tk/1954

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#text ⇒ Object

Returns the value of attribute text

Returns:

  • (Object) —

    the current value of text



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# File 'lib/ver/tooltip.rb', line 3

def text
  @text
end

#tooltip ⇒ Object

Returns the value of attribute tooltip

Returns:

  • (Object) —

    the current value of tooltip



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# File 'lib/ver/tooltip.rb', line 3

def tooltip
  @tooltip
end

Instance Method Details

#bind_to(widget) ⇒ Object 



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# File 'lib/ver/tooltip.rb', line 4

def bind_to(widget)
  widget.bind('<Any-Enter>'   ){ Tk::After.ms(500){ show(widget) }}
  widget.bind('<Any-Leave>'   ){ Tk::After.ms(500){ destroy }}
  widget.bind('<Any-KeyPress>'){ Tk::After.ms(500){ destroy }}
  widget.bind('<Any-Button>'  ){ Tk::After.ms(500){ destroy }}
end

#destroy ⇒ Object 



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# File 'lib/ver/tooltip.rb', line 11

def destroy
  tooltip.destroy
rescue NoMethodError, RuntimeError => ex
end

#show_on(widget) ⇒ Object 



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# File 'lib/ver/tooltip.rb', line 16

def show_on(widget)
  root = Tk.root
  root_pointerx, root_pointery = root.winfo_pointerx, root.winfo_pointery
  return unless Tk::Winfo.containing(root_pointerx, root_pointery)

  destroy

  scrh, scrw = widget.winfo_screenheight, widget.winfo_screenwidth

  self.tooltip = tooltip = Tk::Toplevel.new(widget, bd: true, bg: 'black')
  tooltip.wm_geometry = "+#{scrh}+#{scrw}"
  tooltip.wm_overrideredirect = true
  tooltip.attributes(topmost: true) if tooltip.tk_windowingsystem == :win32

  label = Tk::Label.new(tooltip, bg: :lightyellow, fg: :black,
                                 text: text, justify: :left).pack

  width, height = label.winfo_reqwidth, label.winfo_reqheight

  position_x, position_y = root_pointerx, root_pointery + 25
  root_screen_width = root.winfo_screenwidth

  if (position_x + width) > root_screen_width
    position_x -= ((position_x + width) - root_screen_width)
  end

  tooltip.wm_geometry = "#{width}x#{height}+#{position_x}+#{position_y}"
  tooltip.raise

  tooltip.bind('Any-Enter'){ destroy }
  tooltip.bind('Any-Leave'){ destroy }
end