Class: TkWrapper::Widgets::AutoResizeText

Inherits:
Frame show all
Defined in:
lib/widgets/auto_resize_text.rb

Instance Attribute Summary collapse

Attributes inherited from Base::Widget

#cell, #childs, #config, #font, #ids, #manager, #opts, #parent, #winfo

Instance Method Summary collapse

Methods inherited from Frame

#accumulated_border_and_padding_height, #accumulated_border_and_padding_width, #tk_class

Methods inherited from Base::Widget

#create_tk_widget, #each, #init_id, #initialize_utilities, #normalize_childs, #push, #tk_class, #tk_widget

Constructor Details

#initialize(**args) ⇒ AutoResizeText

Returns a new instance of AutoResizeText.



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# File 'lib/widgets/auto_resize_text.rb', line 8

def initialize(**args)
  @min_number_chars = 8
  @min_number_lines = 2

  super(**args)

  @longest_line_width = 0
  @config.merge({ grid: :onecell }, overwrite: false)
end

Instance Attribute Details

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/widgets/auto_resize_text.rb', line 6

def text
  @text
end

Instance Method Details

#additional_height_needed_for_textfield ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 41

def additional_height_needed_for_textfield
  # TODO: cursor height?
  @text.accumulated_border_and_padding_height +
    accumulated_border_and_padding_height
end

#additional_width_needed_for_textfield ⇒ Object

width of cursor + borders (textfield + frame) + padding (textfield + frame)



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# File 'lib/widgets/auto_resize_text.rb', line 35

def additional_width_needed_for_textfield
  @text.opts.insertwidth +
    @text.accumulated_border_and_padding_width +
    accumulated_border_and_padding_width
end

#autoresize ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 88

def autoresize
  return unless @text.tk_widget.modified?

  width  = [[min_width,  width_needed_for_textfield].max, max_width].min
  height = [min_height, height_needed_for_textfield].max

  resize(height: height, width: width)

  @text.tk_widget.modified(false)
end

#build(parent, **args) ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 26

def build(parent, **args)
  super(parent, **args)
  @text.bind('<Modified>', &method(:autoresize))
  TkGrid.propagate(tk_widget, 0)
  resize(lines: @min_number_lines, chars: @min_number_chars)
  #@text.resize(lines: @min_number_lines, chars: @min_number_chars)
end

#create_childs ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 18

def create_childs
  @text = Text.new(config: {
    grid:   { sticky: 'nsew' },
    width:  @min_number_chars,
    height: @min_number_lines
  })
end

#height_needed_for_lines(num_lines) ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 51

def height_needed_for_lines(num_lines)
  @text.height_of_lines(num_lines) + additional_height_needed_for_textfield
end

#height_needed_for_textfield ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 72

def height_needed_for_textfield
  @text.height_of_lines + additional_height_needed_for_textfield
end

#max_width ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 76

def max_width
  [@cell.bbox[2], 0].max
end

#min_height ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 84

def min_height
  height_needed_for_lines(@min_number_lines)
end

#min_width ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 80

def min_width
  [max_width, width_needed_for_chars(@min_number_chars)].min
end

#resize(height: nil, width: nil, lines: nil, chars: nil) ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 60

def resize(height: nil, width: nil, lines: nil, chars: nil)
  width  = width_needed_for_chars(chars)  if chars
  height = height_needed_for_lines(lines) if lines

  opts.width  = width  if width
  opts.height = height if height
end

#resize_width ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 55

def resize_width
  opts.width = width_needed_for_textfield
  @parent.tk_widget.update
end

#width_needed_for_chars(num_chars) ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 47

def width_needed_for_chars(num_chars)
  text.font.char_width * num_chars + additional_width_needed_for_textfield
end

#width_needed_for_textfield ⇒ Object 



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# File 'lib/widgets/auto_resize_text.rb', line 68

def width_needed_for_textfield
  @text.longest_line_width + additional_width_needed_for_textfield
end