Class: Shoes::Swt::TextBlock::TextSegment

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
shoes-swt/lib/shoes/swt/text_block/text_segment.rb

Overview

Resources created here need to be disposed (see #dispose). Note that this applies to ::Swt::Font and ::Swt::TextLayout. ::Swt::TextStyle does not need to be disposed, because it is not backed by system resources.

The instance factories and our own instances will track these resources and ensure that they get properly disposed when TextBlock or Fitter tell us we’re done.

These are only expected to be called during contents_alignment

Direct Known Subclasses

CenteredTextSegment

Constant Summary collapse

DEFAULT_SPACING = 
4

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dsl, text, width) ⇒ TextSegment

Returns a new instance of TextSegment.



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 27

def initialize(dsl, text, width)
  @dsl = dsl
  @layout = ::Swt::TextLayout.new Shoes.display
  @fill_background = false

  @font_factory = TextFontFactory.new
  @style_factory = TextStyleFactory.new
  @color_factory = ColorFactory.new

  layout.text = text
  layout.width = width
  style_from(font_styling, @dsl.style)
end

Instance Attribute Details

#element_left ⇒ Object (readonly)

Returns the value of attribute element_left.



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 21

def element_left
  @element_left
end

#element_top ⇒ Object (readonly)

Returns the value of attribute element_top.



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 21

def element_top
  @element_top
end

#fill_background ⇒ Object

Returns the value of attribute fill_background.



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 22

def fill_background
  @fill_background
end

#layout ⇒ Object (readonly)

Returns the value of attribute layout.



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 21

def layout
  @layout
end

Instance Method Details

#dispose ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 41

def dispose
  @layout.dispose unless @layout.disposed?
  @font_factory.dispose
  @style_factory.dispose
  @color_factory.dispose
end

#draw(graphics_context) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 110

def draw(graphics_context)
  # Why not use TextLayout's background? Unfortunately it doesn't draw
  # all the way to the edges--just around the literal text. This leaves
  # things jagged when we flow, so do it ourselves.
  if fill_background && @dsl.style[:fill]
    background_color = @color_factory.create(@dsl.style[:fill])
    background_color.apply_as_fill(graphics_context)
    graphics_context.fill_rectangle(@dsl.translate_left + element_left,
                                    @dsl.translate_top + element_top,
                                    width,
                                    height)
  end

  layout.draw(graphics_context,
              @dsl.translate_left + element_left,
              @dsl.translate_top + element_top)
end

#font_styling ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 79

def font_styling
  {
    font_detail: {
      name: @dsl.font,
      size: @dsl.size,
      styles: [::Swt::SWT::NORMAL]
    }
  }
end

#get_location(cursor, trailing = false) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 54

def get_location(cursor, trailing = false)
  @layout.get_location(cursor, trailing)
end

#height ⇒ Object

Why not just use layout.bounds? Recent versions of SWT have shown platform dependent behavior about whether spacing is included in bounds, leading to unpredictable placement. Doing it more directly per-line in this fashion insulates us from the regression. #1295



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 93

def height
  line_count = layout.line_count
  h = (line_count - 1) * layout.spacing
  line_count.times do |i|
    h += layout.get_line_bounds(i).height
  end
  h
end

#in_bounds?(x, y) ⇒ Boolean

x,y in app coordinates, so translate for layout’s element-local values

Returns:

  • (Boolean) 


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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 129

def in_bounds?(x, y)
  layout.bounds.contains?(x - element_left, y - element_top)
end

#last_line_height ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 102

def last_line_height
  layout.get_line_bounds(layout.line_count - 1).height
end

#last_line_width ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 106

def last_line_width
  layout.get_line_bounds(layout.line_count - 1).width
end

#position_at(element_left, element_top) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 48

def position_at(element_left, element_top)
  @element_left = element_left
  @element_top = element_top
  self
end

#set_style(styles, range = (0...text.length)) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 70

def set_style(styles, range = (0...text.length))
  # If we've been given an empty/nonsense range, just ignore it
  return unless range.count.positive?

  font = @font_factory.create_font(styles[:font_detail])
  style = @style_factory.create_style(font, styles[:fg], styles[:bg], styles)
  layout.set_style(style, range.min, range.max)
end

#style_from(default_text_styles, style) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/text_block/text_segment.rb', line 58

def style_from(default_text_styles, style)
  layout.justify = style[:justify]
  layout.spacing = (style[:leading] || DEFAULT_SPACING)
  layout.alignment = case style[:align]
                     when 'center' then ::Swt::SWT::CENTER
                     when 'right' then  ::Swt::SWT::RIGHT
                     else ::Swt::SWT::LEFT
                     end

  set_style(TextStyleFactory.apply_styles(default_text_styles, style))
end