Class: EideticRML::LayoutManagers::FlowLayout

Inherits:
LayoutManager show all
Defined in:
lib/erml_layout_managers.rb

Instance Method Summary collapse

Methods inherited from LayoutManager

#after_layout, #col_grid, for_name, #initialize, #layout_absolute, #layout_relative, register, #row_grid

Constructor Details

This class inherits a constructor from EideticRML::LayoutManagers::LayoutManager

Instance Method Details

#layout(container, writer) ⇒ Object 



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# File 'lib/erml_layout_managers.rb', line 107

def layout(container, writer)
  cx = cy = max_y = 0
  container_full = false
  bottom = container.content_top + container.max_content_height
  widgets, remaining = printable_widgets(container, :static)
  remaining.each { |widget| widget.visible = false if widget.printed }
  widgets.each do |widget|
    widget.visible = !container_full
    next if container_full
    widget.before_layout
    widget.width([widget.preferred_width(writer) || container.content_width, container.content_width].min, :pt) if widget.width.nil?
    # puts "flow widget width: #{widget.width} #{widget.path}"
    if cx != 0 and cx + widget.width > container.content_width
      cy += max_y + @style.vpadding
      cx = max_y = 0
    end
    widget.left(container.content_left + cx, :pt)
    widget.top(container.content_top + cy, :pt)
    widget.height(widget.preferred_height(writer) || 0, :pt) if widget.height.nil? # swapped
    widget.layout_widget(writer)                                                   # swapped
    # if container.bottom and widget.bottom > container.bottom
    if widget.bottom > bottom
      container_full = true
      # widget.visible = (cy == 0)
      widget.visible = container.root_page.positioned_widgets[:static] == 0
      # $stderr.puts "+++flow+++ #{container.root_page.positioned_widgets[:static]}, visible: #{widget.visible}"
      next
    end
    container.root_page.positioned_widgets[widget.position] += 1
    cx += widget.width + @style.hpadding
    max_y = [max_y, widget.height].max
  end
  container.more(true) if container_full and container.overflow
  container.height(cy + max_y + container.non_content_height, :pt) if container.height.nil? and max_y > 0
  super(container, writer)
end

#preferred_height(grid, writer) ⇒ Object 



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# File 'lib/erml_layout_managers.rb', line 144

def preferred_height(grid, writer)
  cells = grid.row(0)
  return 0 if cells.empty?
  cell_heights = cells.map { |w| w.preferred_height(writer) }
  return nil unless cell_heights.all?
  cell_heights.max
end

#preferred_width(grid, writer) ⇒ Object 



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# File 'lib/erml_layout_managers.rb', line 152

def preferred_width(grid, writer)
  cells = grid.row(0)
  return 0 if cells.empty?
  cell_widths = cells.map { |w| w.preferred_width(writer) }
  return nil unless cell_widths.all?
  cell_widths.inject((cells.size - 1) * @style.hpadding) { |sum, width| sum + width }
end