Class: Charming::Components::Viewport::Position

Inherits:
Object
  • Object
show all
Defined in:
lib/charming/presentation/components/viewport/position.rb

Overview

Position owns the viewport’s mutable row and column offsets.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(offset:, column:) ⇒ Position

Returns a new instance of Position.



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# File 'lib/charming/presentation/components/viewport/position.rb', line 10

def initialize(offset:, column:)
  @offset = offset
  @column = column
end

Instance Attribute Details

#column ⇒ Object (readonly)

Returns the value of attribute column.



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# File 'lib/charming/presentation/components/viewport/position.rb', line 8

def column
  @column
end

#offset ⇒ Object (readonly)

Returns the value of attribute offset.



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# File 'lib/charming/presentation/components/viewport/position.rb', line 8

def offset
  @offset
end

Instance Method Details

#clamp(bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 60

def clamp(bounds)
  @offset = offset.clamp(0, bounds.fetch(:max_offset))
  @column = column.clamp(0, bounds.fetch(:max_column))
end

#end_at(bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 40

def end_at(bounds)
  @offset = bounds.fetch(:max_offset)
  @column = bounds.fetch(:max_column)
end

#home ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 35

def home
  @offset = 0
  @column = 0
end

#move_to(row, bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 55

def move_to(row, bounds)
  @offset = row
  clamp(bounds)
end

#page_down(page_size, bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 30

def page_down(page_size, bounds)
  @offset += page_size
  clamp(bounds)
end

#page_up(page_size, bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 25

def page_up(page_size, bounds)
  @offset -= page_size
  clamp(bounds)
end

#scroll_down(bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 20

def scroll_down(bounds)
  @offset += 1
  clamp(bounds)
end

#scroll_left(bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 45

def scroll_left(bounds)
  @column -= 1
  clamp(bounds)
end

#scroll_right(bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 50

def scroll_right(bounds)
  @column += 1
  clamp(bounds)
end

#scroll_up(bounds) ⇒ Object 



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# File 'lib/charming/presentation/components/viewport/position.rb', line 15

def scroll_up(bounds)
  @offset -= 1
  clamp(bounds)
end