Class: StackLayout

Inherits:
AbstractLayout show all
Defined in:
lib/canis/core/include/layouts/stacklayout.rb

Overview

it, others that are complex may require the same.

Instance Attribute Summary

Attributes inherited from AbstractLayout

#bottom_margin, #components, #form, #gap, #height, #height_pc, #ignore_list, #left_margin, #right_margin, #top_margin, #width, #width_pc

Instance Method Summary collapse

Methods inherited from AbstractLayout

#_init_layout, #add, #add_with_weight, #cget, #clear, #configure_item, #cset, #push, #remove

Constructor Details

#initialize(arg, config = {}, &block) ⇒ StackLayout

Returns a new instance of StackLayout.

Parameters:

  • optional (Form) —

    give a form

  • optional (Hash) —

    give settings/attributes which will be set into variables



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# File 'lib/canis/core/include/layouts/stacklayout.rb', line 19

def initialize arg, config={}, &block
  @wts = {}
  super
end

Instance Method Details

#do_layout ⇒ Object

This program lays out the widgets deciding their row and columm and height and weight. This program is called once at start of application, and again whenever a RESIZE event happens.



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# File 'lib/canis/core/include/layouts/stacklayout.rb', line 37

def do_layout
  _init_layout
  r = @top_margin
  c = @left_margin
  #
  # determine fixed widths and how much is left to share with others,
  # and how many variable width components there are.
  ht = 0   # accumulate fixed height
  fixed_ctr = 0 # how many items have a fixed wt
  var_ctr = 0
  var_wt = 0.0
  @components.each do |e|
    $log.debug "  looping 1 #{e.name} "
    _tmpwt = @wts[e] || 0
    # what of field and button placed side by side
    if e.is_a? Field or e.is_a? Button or e.is_a? Label
      @wts[e] ||= 1
      ht += @wts[e] || 1
      fixed_ctr += 1
    elsif _tmpwt >= 1
        ht += @wts[e] || 0
        fixed_ctr += 1
    elsif _tmpwt > 0 and _tmpwt <= 1
      # FIXME how to specify 100 % ???
      var_ctr += 1
      var_wt += @wts[e]
    end
  end
  unaccounted = @components.count - (fixed_ctr + var_ctr)
  $log.debug "  unacc #{unaccounted} , fixed #{fixed_ctr} , var : #{var_ctr} , ht #{ht} height #{@height}  "
  balance_ht = @height - ht # use this for those who have specified a %
  balance_ht1 = balance_ht * (1 - var_wt )
  average_ht = (balance_ht1 / unaccounted).floor # give this to those who have not specified ht
  average_ht = (balance_ht1 / unaccounted) # give this to those who have not specified ht
  $log.debug "  #{balance_ht} , #{balance_ht1} , #{average_ht} "
  # not accounted for gap in heights
  rem = 0 # remainder to be carried over
  @components.each do |e|
    $log.debug "  looping 2 #{e.name} #{e.class.to_s.downcase} "
    next if @ignore_list.include? e.class.to_s.downcase
    $log.debug "  looping 3 #{e.name} "
    e.row = r
    e.col = c
    wt = @wts[e]
    if wt
      if wt.is_a? Fixnum
        e.height = wt
      elsif wt.is_a? Float
        e.height = (wt * balance_ht).floor
      end
    else
      # no wt specified, give average of balance wt
      e.height = average_ht
      hround = e.height.floor

      rem += e.height - hround
      e.height = hround
      # see comment in prev block regarding remaininder
      if rem >= 1
        e.height += 1
        rem = 0
      end
    end
    $log.debug "  layout #{e.name} , h: #{e.height} r: #{e.row} , c = #{e.col} "

    e.width = @width
    r += e.height.floor
    r += @gap
  end
  $log.debug "  layout finished "
end

#weightage(item, wt) ⇒ Object

in case user does not wish to add objects, but wishes to specify the weightage on one, send in the widget and its weightage.

Parameters:

  • widget (Widget) —

    whose weightage is to be specified

  • weightage (Float, Fixnum) —

    for the given widget (@see add_with_weight)



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# File 'lib/canis/core/include/layouts/stacklayout.rb', line 30

def weightage item, wt
  @wts[item] = wt
end