Class: VER::HoverCompletion

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

Overview

TODO: the positioning behaviour is still annoying, for some reason I just can’t get a handle on a changed position. Even using the tk-internal Expose event works only sometimes.

Defined Under Namespace

Classes: Listbox

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent, options = {}, &completer) ⇒ HoverCompletion

Returns a new instance of HoverCompletion.



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# File 'lib/ver/hover_completion.rb', line 44

def initialize(parent, options = {}, &completer)
  @parent, @options, @completer = parent, options, completer
  setup_widgets
  setup_events
  update
end

Instance Attribute Details

#choices ⇒ Object

Returns the value of attribute choices.



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# File 'lib/ver/hover_completion.rb', line 42

def choices
  @choices
end

#completer ⇒ Object

Returns the value of attribute completer.



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# File 'lib/ver/hover_completion.rb', line 42

def completer
  @completer
end

#from ⇒ Object

Returns the value of attribute from.



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# File 'lib/ver/hover_completion.rb', line 42

def from
  @from
end

#list ⇒ Object (readonly)

Returns the value of attribute list.



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# File 'lib/ver/hover_completion.rb', line 41

def list
  @list
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/ver/hover_completion.rb', line 42

def options
  @options
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/ver/hover_completion.rb', line 41

def parent
  @parent
end

#to ⇒ Object

Returns the value of attribute to.



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# File 'lib/ver/hover_completion.rb', line 42

def to
  @to
end

Instance Method Details

#cancel ⇒ Object 



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# File 'lib/ver/hover_completion.rb', line 136

def cancel
  list.destroy
  parent.focus
end

#continue_completion ⇒ Object 



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# File 'lib/ver/hover_completion.rb', line 63

def continue_completion
  pick
  options[:continue] ? update : cancel
end

#layout ⇒ Object 



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# File 'lib/ver/hover_completion.rb', line 93

def layout
  return unless choices && choices.size > 0

  x, y, caret_height =
    parent.tk_caret.values_at(:x, :y, :height)

  height, width = parent.winfo_height, parent.winfo_width
  height -= parent.status.winfo_height

  # use side with most space, east or west
  if x > (width / 2)
    side = 'e'
  else
    side = 'w'
  end

  # use hemisphere with most space
  if y < (height / 3)
    hemisphere = 'n'
    y += caret_height
    height -= y
  elsif y < (height / 2)
    hemisphere = ''
    height -= ((height - y) / 2)
  else
    hemisphere = 's'
    height -= (height - y)
  end

  list.configure width: @longest_choice + 2, height: -1
  height = [height, list.winfo_reqheight].min
  width = [width, list.winfo_reqwidth].min

  list.place(
    x: x,
    y: y,
    height: height,
    width: width,
    in: parent,
    anchor: "#{hemisphere}#{side}"
  )
end

#pick ⇒ Object 



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# File 'lib/ver/hover_completion.rb', line 73

def pick
  index = list.curselection.first
  replacement = list.get(index)
  parent.replace(from, to, replacement)
end

#setup_events ⇒ Object 



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# File 'lib/ver/hover_completion.rb', line 58

def setup_events
  list.bind('<<ListboxSelect>>'){ layout }
  list.bind('<Expose>'){ layout }
end

#setup_widgets ⇒ Object 



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# File 'lib/ver/hover_completion.rb', line 51

def setup_widgets
  @list = Listbox.new(parent, borderwidth: 0, selectmode: :single)
  @list.hover_completion = self
  @list.major_mode = :HoverCompletion
  @list.focus
end

#submit ⇒ Object 



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# File 'lib/ver/hover_completion.rb', line 68

def submit
  pick
  cancel
end

#update ⇒ Object 



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# File 'lib/ver/hover_completion.rb', line 79

def update
  self.from, self.to, self.choices = completer.call
  @longest_choice = choices.map{|choice| choice.size }.max

  if choices && choices.size > 0
    list.value = choices
    list.select 0

    submit if choices.size == 1
  else
    cancel
  end
end