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[rails.git] / app / helpers / svg_helper.rb

diff --git a/app/helpers/svg_helper.rb b/app/helpers/svg_helper.rb
index 21b7c91adacfdd8bb46829806f76770759952e89..62b39bf6792fb515e5890715bf5768848f86a9d8 100644 (file)
--- a/app/helpers/svg_helper.rb
+++ b/app/helpers/svg_helper.rb
@@ -1,4 +1,12 @@
 module SvgHelper
+  def previous_page_svg_tag(**options)
+    adjacent_page_svg_tag(dir == "rtl" ? 1 : -1, **options)
+  end
+
+  def next_page_svg_tag(**options)
+    adjacent_page_svg_tag(dir == "rtl" ? -1 : 1, **options)
+  end
+
   def key_svg_tag(**options)
     border_width = options["border"] ? (options["border-width"] || 1) : 0
     rect_attrs = {
@@ -14,21 +22,37 @@ module SvgHelper
     svg_attrs = options.slice("width", "height", "opacity", :class)
 
     tag.svg(**svg_attrs) do
+      horizontal = "H#{options['width']}"
       concat tag.rect(**rect_attrs, **stroke_attrs(options, "border")) if options["fill"] || options["border"]
-      concat tag.line(:x2 => "100%", :y1 => "50%", :y2 => "50%", **stroke_attrs(options, "line")) if options["line"]
+      if options["line"]
+        y_middle = format("%g", 0.5 * options["height"])
+        concat tag.path(:d => "M0,#{y_middle} #{horizontal}", **stroke_attrs(options, "line"))
+      end
       if options["casing"]
         casing_width = options["casing-width"] || 1
-        y_top = 0.5 * casing_width
-        y_bottom = options["height"] - (0.5 * casing_width)
-        concat tag.g(tag.line(:x2 => "100%", :y1 => y_top, :y2 => y_top) +
-                     tag.line(:x2 => "100%", :y1 => y_bottom, :y2 => y_bottom),
-                     **stroke_attrs(options, "casing"))
+        y_top = format("%g", 0.5 * casing_width)
+        y_bottom = format("%g", options["height"] - (0.5 * casing_width))
+        concat tag.path(:d => "M0,#{y_top} #{horizontal} M0,#{y_bottom} #{horizontal}", **stroke_attrs(options, "casing"))
       end
     end
   end
 
   private
 
+  # returns "<" shape if side == -1; ">" if side == 1
+  def adjacent_page_svg_tag(side, **options)
+    count = options[:count] || 1
+    height = options[:height] || 15
+    pad = 2
+    segment = (0.5 * height) - pad
+    width = (segment + (2 * count * pad)).ceil
+    angled_line_data = "l#{side * segment},#{segment} l#{-side * segment},#{segment}"
+    path_data = Array.new(count) { |i| "M#{side * ((2 * i) + 1) * pad},#{pad} #{angled_line_data}" }.join(" ")
+    path_tag = tag.path :d => path_data, :fill => "none", :stroke => "currentColor", :"stroke-width" => 1.5
+    view_box = "#{-width} 0 #{width} #{height}" if side.negative?
+    tag.svg path_tag, :width => width, :height => height, :viewBox => view_box, :class => options[:class]
+  end
+
   def stroke_attrs(attrs, prefix)
     attrs.select { |key| key.start_with?(prefix) }.transform_keys { |key| key.delete_prefix(prefix).prepend("stroke") }
   end