Shapes: Support setting background color

lib/pptx/generate_sample.rb

@@ -22,11 +22,12 @@ def main
   slide.add_textbox date_dimensions, '18 Feb 2015'
   slide.add_textbox text_dimensions,
                     "Text box text with long text that should be broken " +
-                    "down into multiple lines.\n:)\nwith<stuff>&to<be>escaped\nYay!"
+                    "down into multiple lines.\n:)\nwith<stuff>&to<be>escaped\nYay!",
+                    bg: '4d4d4d'
 
   image = PPTX::OPC::FilePart.new(pkg, 'spec/fixtures/test_picture.png')
   slide.add_picture image_dimensions, 'photo.jpg', image
-  slide.add_filled_rectangle(PPTX::cm(24.9, 0, 0.5, 19.05), '558ed5')
+  slide.add_filled_rectangle(PPTX::cm(24.9, 0, 0.5, 19.05), bg: '558ed5')
   slide.add_slide_number(PPTX::cm(23.4, 17.5, 1, 0.8), 1, sz: 12*PPTX::POINT,
                                                           color: '4d4d4d',
                                                           align: 'r')

lib/pptx/shapes/filled_rectangle.rb

@@ -1,9 +1,8 @@
 module PPTX
   module Shapes
     class FilledRectangle < Shape
-      def initialize(transform, color)
-        super(transform)
-        @color = color
+      def initialize(transform, formatting={})
+        super(transform, extract_shape_properties(formatting))
       end
 
       def base_xml
@@ -23,9 +22,7 @@ def base_xml
       end
 
       def build_node
-        base_node.tap do |node|
-          node.xpath('.//p:spPr', p: Presentation::NS).first.add_child build_solid_fill @color
-        end
+        base_node
       end
     end
   end

lib/pptx/shapes/shape.rb

@@ -1,17 +1,19 @@
 module PPTX
   module Shapes
     class Shape
-      def initialize(transform)
+      def initialize(transform, shape_formatting={})
         @transform = transform
+        @shape_formatting = shape_formatting
       end
 
       def base_node
         @base_node ||= Nokogiri::XML::DocumentFragment.parse(base_xml).tap do |node|
-          set_shape_properties(node, *@transform)
+          build_shape_properties(node, *@transform)
+          set_shape_properties(node, @shape_formatting)
         end
       end
 
-      def set_shape_properties(node, x, y, width, height)
+      def build_shape_properties(node, x, y, width, height)
         xml = """
           <p:spPr xmlns:a='http://schemas.openxmlformats.org/drawingml/2006/main'
                   xmlns:p='http://schemas.openxmlformats.org/presentationml/2006/main'>
@@ -30,6 +32,25 @@ def set_shape_properties(node, x, y, width, height)
             .replace(Nokogiri::XML::DocumentFragment.parse(xml))
       end
 
+
+      def set_shape_properties(node, formatting)
+        bg = formatting.delete(:bg)
+        node.xpath('.//p:spPr', p: Presentation::NS).first.add_child build_solid_fill(bg) if(bg)
+      end
+
+      def extract_shape_properties(formatting)
+        shape_formats = [:bg]
+
+        shape_formatting = {}
+        formatting.each do |type, value|
+          if(shape_formats.include?(type))
+            shape_formatting[type] = value
+            formatting.delete(type)
+          end
+        end
+        shape_formatting
+      end
+
       def build_solid_fill(rgb_color)
         fill_xml = """
         <a:solidFill xmlns:a='http://schemas.openxmlformats.org/drawingml/2006/main'>

lib/pptx/shapes/textbox.rb

@@ -2,7 +2,7 @@ module PPTX
   module Shapes
     class Textbox < Shape
       def initialize(transform, content, formatting={})
-        super(transform)
+        super(transform, extract_shape_properties(formatting))
         @content = content
         @formatting = formatting
       end

lib/pptx/slide.rb

@@ -57,9 +57,10 @@ def add_picture(transform, name, image)
     # * sz: font size (use PPTX::POINT)
     # * b: 1 for bold
     # * i: 1 for italic
-    # There are two custom properties:
+    # There are three custom properties:
     # * color: aabbcc (hex RGB color)
     # * align: ctr|dist|just|justLow|l|r|thaiDist (ST_TextAlignType (Text Alignment Types))
+    # * bg: aabbcc (hex RGB color)
     def add_textbox(transform, content, formatting={})
       shape = Shapes::Textbox.new(transform, content, formatting)
       shape_tree_xml.add_child(shape.build_node)