Class: Shoes::Slot

Inherits:
Common::UIElement show all
Includes:
Common::Clickable, Common::Hover
Defined in:
shoes-core/lib/shoes/slot.rb

Direct Known Subclasses

Flow, Stack

Defined Under Namespace

Classes: Position

Constant Summary collapse

NEXT_ELEMENT_OFFSET =

We need that offset because otherwise element overlap e.g. occupy the same pixel - this way they start right next to each other See #update_current_position

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STYLES = 
{ scroll: false, fill: Shoes::COLORS[:black] }.freeze

Constants included from Common::Style

Common::Style::DEFAULT_STYLES, Common::Style::STYLE_GROUPS

Instance Attribute Summary collapse

Attributes included from Common::Hover

#hover_blk, #leave_blk

Attributes included from Common::Clickable

#pass_coordinates

Instance Method Summary collapse

Methods included from Common::Hover

#apply_style_from_hover_class, #apply_style_from_pre_hover, create_hover_class, #eval_hover_block, #hover, #hover_class, #hovered?, #leave, #mouse_hovered, #mouse_left

Methods included from Common::Clickable

#click, #pass_coordinates?, #register_click, #release

Methods inherited from Common::UIElement

#add_to_parent, #after_initialize, #create_backend, #initialize, #needs_rotate?, #painted?, #redraw_height, #redraw_left, #redraw_top, #redraw_width, #update_fill, #update_stroke

Methods included from Common::Style

#applicable_app_styles, #create_style_hash, included, #style, #style_init

Methods included from Common::SafelyEvaluate

#safely_evaluate

Methods included from Common::Positioning

#_position, #displace, #move

Methods included from Common::Visibility

#hidden?, #hidden_from_view?, #hide, #outside_parent_view?, #show, #toggle, #visible?

Methods included from Common::Inspect

#to_s

Methods included from Common::Attachable

#attached_to

Constructor Details

This class inherits a constructor from Shoes::Common::UIElement

Instance Attribute Details

#blk ⇒ Object (readonly)

Returns the value of attribute blk.



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# File 'shoes-core/lib/shoes/slot.rb', line 13

def blk
  @blk
end

#contents ⇒ Object (readonly)

Returns the value of attribute contents.



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# File 'shoes-core/lib/shoes/slot.rb', line 13

def contents
  @contents
end

#dimensions ⇒ Object (readonly)

Returns the value of attribute dimensions.



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# File 'shoes-core/lib/shoes/slot.rb', line 13

def dimensions
  @dimensions
end

#gui ⇒ Object (readonly)

Returns the value of attribute gui.



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# File 'shoes-core/lib/shoes/slot.rb', line 13

def gui
  @gui
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'shoes-core/lib/shoes/slot.rb', line 13

def parent
  @parent
end

#scroll_height ⇒ Object

Returns the value of attribute scroll_height.



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# File 'shoes-core/lib/shoes/slot.rb', line 16

def scroll_height
  @scroll_height
end

#scroll_top ⇒ Object

Returns the value of attribute scroll_top.



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# File 'shoes-core/lib/shoes/slot.rb', line 15

def scroll_top
  @scroll_top
end

Instance Method Details

#add_child(element) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 79

def add_child(element)
  contents.add_element element

  return if element.hidden? || !element.takes_up_space?

  # Prepending would entail repositioning everyone after us, so just give
  # it up and let contents_alignment save us the work.
  if contents.prepending?
    contents_alignment
  else
    original_height = self.height
    @current_position = positioning(element, @current_position)

    height_delta = slot_grew_by(original_height)
    bump_parent_current_position(height_delta)
  end
end

#add_mouse_hover_control ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 149

def add_mouse_hover_control
  @app.add_mouse_hover_control(self)
end

#any_sibling_slots_following?(growing_slot) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'shoes-core/lib/shoes/slot.rb', line 121

def any_sibling_slots_following?(growing_slot)
  next_sibling  = contents.index(growing_slot) + 1
  next_siblings = contents[next_sibling..-1]
  next_siblings.any? { |e| e.is_a?(Slot) }
end

#app ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 170

def app
  @app.app # return the Shoes::App not the internal app
end

#append(&blk) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 131

def append(&blk)
  eval_block blk
end

#before_initialize(*_) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 30

def before_initialize(*_)
  @contents = SlotContents.new
  @last_hidden_state = nil
end

#bump_current_position(growing_slot, height_delta) ⇒ Object

This method gets called when one of our child slots got larger, so we need to move our current position to accomodate.



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# File 'shoes-core/lib/shoes/slot.rb', line 111

def bump_current_position(growing_slot, height_delta)
  # If intermediate child changed, give up and hit it with the big hammer
  if any_sibling_slots_following?(growing_slot)
    contents_alignment
  else
    @current_position.y += height_delta
    @current_position.next_line_start += height_delta
  end
end

#bump_parent_current_position(height_delta) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 102

def bump_parent_current_position(height_delta)
  return unless height_delta.positive?
  return unless parent.respond_to?(:bump_current_position)

  parent.bump_current_position(self, height_delta)
end

#clear(&blk) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 54

def clear(&blk)
  contents.clear
  eval_block blk
  self
end

#contents_alignment(_ = nil) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 141

def contents_alignment(_ = nil)
  position_contents
  update_child_visibility

  # Layout code expects height returned!
  determine_slot_height
end

#create_bound_block(blk) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 73

def create_bound_block(blk)
  proc do |*args|
    eval_block(blk, *args)
  end
end

#create_dimensions(*args) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 21

def create_dimensions(*args)
  super(*args)

  @fixed_height = !height.nil?
  @scroll_top   = 0
  set_default_dimension_values
  @pass_coordinates = true
end

#eval_block(blk, *args) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 66

def eval_block(blk, *args)
  old_current_slot = @app.current_slot
  @app.current_slot = self
  safely_evaluate(*args, &blk)
  @app.current_slot = old_current_slot
end

#fixed_height? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'shoes-core/lib/shoes/slot.rb', line 178

def fixed_height?
  @fixed_height
end

#handle_block(blk) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 35

def handle_block(blk)
  snapshot_current_position

  @blk = blk
  eval_block blk
end

#inspect ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 174

def inspect
  "#<#{self.class}:0x#{hash.to_s(16)} @contents=#{@contents.inspect} and so much stuff literally breaks the memory limit. Look at it selectively.>"
end

#prepend(&blk) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 135

def prepend(&blk)
  contents.prepend do
    eval_block blk
  end
end

#remove ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 60

def remove
  clear
  super
  self
end

#remove_child(element) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 127

def remove_child(element)
  contents.delete element
end

#scroll_max ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 163

def scroll_max
  contents_alignment
  return 0 unless scroll_height && height

  [scroll_height - height, 0].max
end

#set_default_dimension_values ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 47

def set_default_dimension_values
  self.width          ||= 1.0
  self.height         ||= 0
  self.absolute_left  ||= 0
  self.absolute_top   ||= 0
end

#slot_grew_by(original_height) ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 97

def slot_grew_by(original_height)
  determine_slot_height
  self.height - original_height
end

#snapshot_current_position ⇒ Object 



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# File 'shoes-core/lib/shoes/slot.rb', line 42

def snapshot_current_position
  top = element_top - scroll_offset
  @current_position = Position.new element_left, top, top
end

#variable_height? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'shoes-core/lib/shoes/slot.rb', line 182

def variable_height?
  !@fixed_height
end