Added support for "extends" in layouts

samples/custom-layout.yml

@@ -3,25 +3,32 @@ frame:
   y: 38
   width: 750
   height: 1050
+  radius: 25
 title:
   x: 125
   y: 50
   width: 625
-  height: 150
-  align: !ruby/symbol center
-  hint: !ruby/symbol cyan
+  height: 100
+  align: !ruby/symbol center #see http://www.yaml.org/YAML_for_ruby.html#symbols
+  valign: !ruby/symbol middle  
 subtitle:
-  x: 125
+  x: 150
   y: 150
-  width: 625
-  height: 150
-icon_left:
-  x: 200
-  y: 250
+  width: 575
+  height: 60
+  align: !ruby/symbol center
+  valign: !ruby/symbol middle
+icon:
   width: 125
   height: 125
-icon_right:
-  x: 400
   y: 250
-  width: 125
-  height: 125  
+icon_left:
+  extends: icon
+  x: 150
+icon_middle:
+  extends: icon
+  x: 350
+  y: 400  #overrides the y inherited from icon
+icon_right:
+  extends: icon
+  x: 550

samples/use_layout.rb

@@ -2,20 +2,28 @@ require 'squib'
 
 Squib::Deck.new(layout: 'custom-layout.yml') do 
   background color: :white
+  hint text: :cyan
 
-  # Layouts are YAML files that specify x, y, width, and height coordinates
+  # Layouts are YAML files that specify any option as a default
   rect layout: :frame
 
   # You can also override a given layout entry in the command
-  rect layout: :frame, width: 50, height: 50
+  circle layout: :frame, x: 50, y: 50, radius: 25
 
   # Any command with x-y-width-height options, we can use a custom layout
   text str: 'The Title', layout: :title
-  png file: 'shiny-purse.png', layout: :icon_left
+
+  # Layouts also support an "extends" attribute to reuse settings
+  svg file: 'spanner.svg', layout: :icon_left
+  png file: 'shiny-purse.png', layout: :icon_middle
   svg file: 'spanner.svg', layout: :icon_right
 
-  # Strings can also be used in layouts
+  # Strings can also be used to specify a layout (e.g. from a data file)
   text str: 'subtitle', layout: 'subtitle'
 
+  # For debugging purposes, you can always print out the loaded layout
+  # require 'pp'
+  # pp @layout
+
   save_png prefix: 'layout_'
 end