Class: Prawn::Text::Formatted::Box
- Inherits:
-
Object
- Object
- Prawn::Text::Formatted::Box
- Includes:
- Wrap
- Defined in:
- lib/prawn/text/formatted/box.rb
Overview
Formatted text box.
Generally, one would use the #formatted_text_box convenience method. However, using ‘Text::Formatted::Box.new` in conjunction with `#render(dry_run: true)` enables one to do calculations prior to placing text on the page, or to determine how much vertical space was consumed by the printed text
Direct Known Subclasses
Experimental API collapse
-
#ascender ⇒ Number
readonly
The height of the ascender of the last line printed.
-
#at ⇒ Array(Number, Number)
readonly
The upper left corner of the text box.
-
#descender ⇒ Number
readonly
The height of the descender of the last line printed.
-
#leading ⇒ Number
readonly
The leading used during printing.
-
#line_height ⇒ Number
readonly
The line height of the last line printed.
-
#text ⇒ Array<Hash>
readonly
The text that was successfully printed (or, if ‘:dry_run` was used, the text that would have been successfully printed).
Experimental API collapse
-
#available_width ⇒ Number
The width available at this point in the box.
- #draw_fragment(fragment, accumulated_width = 0, line_width = 0, word_spacing = 0) ⇒ void
-
#everything_printed? ⇒ Boolean
True if everything printed (or, if ‘:dry_run` was used, everything would have been successfully printed).
-
#height ⇒ Number
The height actually used during the previous #render.
-
#initialize(formatted_text, options = {}) ⇒ Box
constructor
See Prawn::Text#text_box for valid options.
-
#line_gap ⇒ Number
Gap between adjacent lines of text.
-
#nothing_printed? ⇒ Boolean
True if nothing printed (or, if ‘:dry_run` was used, nothing would have been successfully printed).
-
#render(flags = {}) ⇒ Array<Hash>
Render text to the document based on the settings defined in constructor.
Extension API collapse
-
.extensions ⇒ Array<Module>
Text box extensions.
- .inherited(base) ⇒ Object
- #valid_options ⇒ Object
Methods included from Wrap
Constructor Details
#initialize(formatted_text, options = {}) ⇒ Box
See Prawn::Text#text_box for valid options
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# File 'lib/prawn/text/formatted/box.rb', line 173 def initialize(formatted_text, = {}) @inked = false Prawn.(, ) = .dup self.class.extensions.reverse_each { |e| extend(e) } @overflow = [:overflow] || :truncate @disable_wrap_by_char = [:disable_wrap_by_char] self.original_text = formatted_text @text = nil @document = [:document] @direction = [:direction] || @document.text_direction @fallback_fonts = [:fallback_fonts] || @document.fallback_fonts @at = ( [:at] || [@document.bounds.left, @document.bounds.top] ).dup @width = [:width] || (@document.bounds.right - @at[0]) @height = [:height] || default_height @align = [:align] || (@direction == :rtl ? :right : :left) @vertical_align = [:valign] || :top @leading = [:leading] || @document.default_leading @character_spacing = [:character_spacing] || @document.character_spacing @mode = [:mode] || @document.text_rendering_mode @rotate = [:rotate] || 0 @rotate_around = [:rotate_around] || :upper_left @single_line = [:single_line] @draw_text_callback = [:draw_text_callback] # if the text rendering mode is :unknown, force it back to :fill if @mode == :unknown @mode = :fill end if @overflow == :expand # if set to expand, then we simply set the bottom # as the bottom of the document bounds, since that # is the maximum we should expand to @height = default_height @overflow = :truncate end @min_font_size = [:min_font_size] || 5 if [:kerning].nil? [:kerning] = @document.default_kerning? end @options = { kerning: [:kerning], size: [:size], style: [:style], } super(formatted_text, ) end |
Instance Attribute Details
#ascender ⇒ Number (readonly)
The height of the ascender of the last line printed.
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# File 'lib/prawn/text/formatted/box.rb', line 56 def ascender @ascender end |
#at ⇒ Array(Number, Number) (readonly)
The upper left corner of the text box.
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# File 'lib/prawn/text/formatted/box.rb', line 48 def at @at end |
#descender ⇒ Number (readonly)
The height of the descender of the last line printed.
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# File 'lib/prawn/text/formatted/box.rb', line 60 def descender @descender end |
#leading ⇒ Number (readonly)
The leading used during printing.
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# File 'lib/prawn/text/formatted/box.rb', line 64 def leading @leading end |
#line_height ⇒ Number (readonly)
The line height of the last line printed.
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# File 'lib/prawn/text/formatted/box.rb', line 52 def line_height @line_height end |
#text ⇒ Array<Hash> (readonly)
The text that was successfully printed (or, if ‘:dry_run` was used, the text that would have been successfully printed).
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# File 'lib/prawn/text/formatted/box.rb', line 28 def text @text end |
Class Method Details
.extensions ⇒ Array<Module>
Text box extensions.
Example:
“‘ruby module MyWrap
def wrap(array)
initialize_wrap([{ text: 'all your base are belong to us' }])
@line_wrap.wrap_line(
document: @document,
kerning: @kerning,
width: 10000,
arranger: @arranger
)
fragment = @arranger.retrieve_fragment
format_and_draw_fragment(fragment, 0, @line_wrap.width, 0)
[]
end
end
Prawn::Text::Formatted::Box.extensions << MyWrap
box = Prawn::Text::Formatted::Box.new(‘hello world’) box.render(“why can’t I print anything other than” +
'"all your base are belong to us"?')
“‘
See Wrap for what is required of the wrap method if you want to override the default wrapping algorithm.
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# File 'lib/prawn/text/formatted/box.rb', line 391 def self.extensions @extensions ||= [] end |
.inherited(base) ⇒ Object
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# File 'lib/prawn/text/formatted/box.rb', line 396 def self.inherited(base) super extensions.each { |e| base.extensions << e } end |
Instance Method Details
#available_width ⇒ Number
The width available at this point in the box.
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# File 'lib/prawn/text/formatted/box.rb', line 285 def available_width @width end |
#draw_fragment(fragment, accumulated_width = 0, line_width = 0, word_spacing = 0) ⇒ void
This method returns an undefined value.
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# File 'lib/prawn/text/formatted/box.rb', line 304 def draw_fragment( fragment, accumulated_width = 0, line_width = 0, word_spacing = 0 ) case @align when :left x = @at[0] when :center x = @at[0] + (@width * 0.5) - (line_width * 0.5) when :right x = @at[0] + @width - line_width when :justify x = if @direction == :ltr @at[0] else @at[0] + @width - line_width end else raise ArgumentError, 'align must be one of :left, :right, :center or :justify symbols' end x += accumulated_width y = @at[1] + @baseline_y y += fragment.y_offset fragment.left = x fragment.baseline = y if @inked draw_fragment_underlays(fragment) @document.word_spacing(word_spacing) do if @draw_text_callback @draw_text_callback.call( fragment.text, at: [x, y], kerning: @kerning, ) else @document.draw_text!( fragment.text, at: [x, y], kerning: @kerning, ) end end (fragment) end end |
#everything_printed? ⇒ Boolean
True if everything printed (or, if ‘:dry_run` was used, everything would have been successfully printed).
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# File 'lib/prawn/text/formatted/box.rb', line 42 def everything_printed? @everything_printed end |
#height ⇒ Number
The height actually used during the previous #render.
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# File 'lib/prawn/text/formatted/box.rb', line 292 def height return 0 if @baseline_y.nil? || @descender.nil? (@baseline_y - @descender).abs end |
#line_gap ⇒ Number
Gap between adjacent lines of text.
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# File 'lib/prawn/text/formatted/box.rb', line 69 def line_gap line_height - (ascender + descender) end |
#nothing_printed? ⇒ Boolean
True if nothing printed (or, if ‘:dry_run` was used, nothing would have been successfully printed).
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# File 'lib/prawn/text/formatted/box.rb', line 34 def nothing_printed? @nothing_printed end |
#render(flags = {}) ⇒ Array<Hash>
Render text to the document based on the settings defined in constructor.
In order to facilitate look-ahead calculations, this method accepts a ‘dry_run: true` option. If provided, then everything is executed as if rendering, with the exception that nothing is drawn on the page. Useful for look-ahead computations of height, unprinted text, etc.
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# File 'lib/prawn/text/formatted/box.rb', line 251 def render(flags = {}) unprinted_text = [] @document.save_font do @document.character_spacing(@character_spacing) do @document.text_rendering_mode(@mode) do text = normalized_text(flags) @document.font_size(@font_size) do shrink_to_fit(text) if @overflow == :shrink_to_fit process_vertical_alignment(text) @inked = true unless flags[:dry_run] unprinted_text = if @rotate != 0 && @inked render_rotated(text) else wrap(text) end @inked = false end end end end unprinted_text.map do |e| e.merge(text: @document.font.to_utf8(e[:text])) end end |
#valid_options ⇒ Object
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# File 'lib/prawn/text/formatted/box.rb', line 402 def PDF::Core::Text::VALID_OPTIONS + %i[ at height width align valign rotate rotate_around overflow min_font_size disable_wrap_by_char leading character_spacing mode single_line document direction fallback_fonts draw_text_callback ] end |