Class: Clogs::ListBox

Inherits:

Control

• Object
• Shoes::Linkable
• Drawable
• Control
• Clogs::ListBox

Defined in:

lib/clogs/drawables/controls.rb

Overview

A drop-down list. libui's combobox is a real native control, but it cannot live inside an area, so the popup is drawn as an overlay on the same canvas.

Constant Summary

ROW_HEIGHT =

22

Constants inherited from Control

Control::PADDING_X, Control::PADDING_Y

Instance Attribute Summary

Attributes inherited from Control

#focused, #hovered, #pressed

Attributes inherited from Drawable

#abs_x, #abs_y, #children, #height, #parent, #shoes_linkable_id, #styles, #width, #x, #y

Instance Method Summary

• #chosen ⇒ Object
• #close ⇒ Object
• #draw(painter, x, y) ⇒ Object
• #draw_overlay(painter) ⇒ Object

  Drawn by the app after everything else so it sits on top.

• #items ⇒ Object
• #measure(available_width) ⇒ Object
• #on_click(x, y, _button) ⇒ Object
• #open? ⇒ Boolean
• #overlay_contains?(px, py) ⇒ Boolean

Methods inherited from Control

#clickable?, #label, #on_mouse_enter, #on_mouse_leave, #text_style

Methods inherited from Drawable

#add_child, #app, #clickable?, #contains?, #destroy_self, #each_peer, #focus_gained, #focus_lost, #focusable?, for_shoes_class, #hidden?, #initialize, #margin, #needs_layout!, #notify, #on_key, #on_mouse_move, #on_release, #paint, #positioned?, #properties_changed, #redraw!, #remove_child, #requested_height, #requested_width, #set_parent, #style

Constructor Details

This class inherits a constructor from Clogs::Drawable

Instance Method Details

#chosen ⇒ Object

# File 'lib/clogs/drawables/controls.rb', line 486

def chosen
  style(:chosen) || items.first
end

#close ⇒ Object

# File 'lib/clogs/drawables/controls.rb', line 561

def close
  return unless @open

  @open = false
  redraw!
end

#draw(painter, x, y) ⇒ Object

# File 'lib/clogs/drawables/controls.rb', line 495

def draw(painter, x, y)
  painter.draw(fill: [255, 255, 255, 255], stroke: [160, 160, 160, 255], thickness: 1) do |p|
    Clogs.rounded_rect(p, x + 0.5, y + 0.5, @width - 1, @height - 1, 3)
  end
  st = text_style
  unless chosen.to_s.empty?
    block = TextBlock.new([Run.new(text: chosen.to_s, size: st.size, family: st.family, color: st.color)],
      -1, default_family: st.family, default_size: st.size)
    block.draw(painter, x + 6, y + PADDING_Y / 2.0)
    block.free
  end
  # Arrow
  painter.draw(fill: [80, 80, 80, 255]) do |p|
    ax = x + @width - 16
    ay = y + @height / 2.0 - 2
    p.move_to(ax, ay).line_to(ax + 8, ay).line_to(ax + 4, ay + 5).close
  end
end

#draw_overlay(painter) ⇒ Object

Drawn by the app after everything else so it sits on top.

# File 'lib/clogs/drawables/controls.rb', line 515

def draw_overlay(painter)
  return unless @open

  x = @abs_x
  y = @abs_y + @height
  h = ROW_HEIGHT * items.size
  painter.draw(fill: [255, 255, 255, 255], stroke: [140, 140, 140, 255], thickness: 1) do |p|
    p.rect(x + 0.5, y + 0.5, @width - 1, h)
  end
  st = text_style
  items.each_with_index do |item, i|
    iy = y + i * ROW_HEIGHT
    painter.fill_rect(x + 1, iy + 1, @width - 2, ROW_HEIGHT - 1, [220, 235, 255, 255]) if item == chosen
    block = TextBlock.new([Run.new(text: item, size: st.size, family: st.family, color: st.color)],
      -1, default_family: st.family, default_size: st.size)
    block.draw(painter, x + 6, iy + 3)
    block.free
  end
end

#items ⇒ Object

# File 'lib/clogs/drawables/controls.rb', line 482

def items
  Array(style(:items)).map(&:to_s)
end

#measure(available_width) ⇒ Object

# File 'lib/clogs/drawables/controls.rb', line 490

def measure(available_width)
  @width = requested_width(available_width) || [available_width, 200].min
  @height = requested_height(available_width) || (Clogs.default_font_size + PADDING_Y * 2).ceil
end

#on_click(x, y, _button) ⇒ Object

# File 'lib/clogs/drawables/controls.rb', line 546

def on_click(x, y, _button)
  if @open && overlay_contains?(x, y)
    index = ((y - (@abs_y + @height)) / ROW_HEIGHT).to_i
    item = items[index]
    if item
      @styles["chosen"] = item
      notify("change", item)
    end
    @open = false
  else
    @open = !@open
  end
  redraw!
end

#open? ⇒ Boolean

Returns:

• (Boolean)

# File 'lib/clogs/drawables/controls.rb', line 535

def open?
  @open
end

#overlay_contains?(px, py) ⇒ Boolean

Returns:

• (Boolean)

# File 'lib/clogs/drawables/controls.rb', line 539

def overlay_contains?(px, py)
  return false unless @open

  py >= @abs_y + @height && py < @abs_y + @height + ROW_HEIGHT * items.size &&
    px >= @abs_x && px < @abs_x + @width
end