[css-flex] Implement the space-evenly content-distribution value

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1498 matching lines @@
   if (justify_content == kContentPositionFlexEnd)
     return available_free_space;
   if (justify_content == kContentPositionCenter)
     return available_free_space / 2;
   if (justify_content_distribution == kContentDistributionSpaceAround) {
     if (available_free_space > 0 && number_of_children)
       return available_free_space / (2 * number_of_children);
 
     return available_free_space / 2;
   }
+  if (justify_content_distribution == kContentDistributionSpaceEvenly) {
+    if (available_free_space > 0 && number_of_children)
+      return available_free_space / (number_of_children + 1);
+    // Fallback to 'center'

[Manuel Rego, 2017/04/20 08:57:06]

Supernit: End comment with dot.

+    return available_free_space / 2;
+  }
   return LayoutUnit();
 }
 
 static LayoutUnit JustifyContentSpaceBetweenChildren(
     LayoutUnit available_free_space,
     ContentDistributionType justify_content_distribution,
     unsigned number_of_children) {
   if (available_free_space > 0 && number_of_children > 1) {
     if (justify_content_distribution == kContentDistributionSpaceBetween)
       return available_free_space / (number_of_children - 1);
     if (justify_content_distribution == kContentDistributionSpaceAround)
       return available_free_space / number_of_children;
+    if (justify_content_distribution == kContentDistributionSpaceEvenly)
+      return available_free_space / (number_of_children + 1);
   }
   return LayoutUnit();
 }
 
 static LayoutUnit AlignmentOffset(LayoutUnit available_free_space,
                                   ItemPosition position,
                                   LayoutUnit ascent,
                                   LayoutUnit max_ascent,
                                   bool is_wrap_reverse) {
   switch (position) {
@@ skipping 417 matching lines @@
   if (align_content == kContentPositionFlexEnd)
     return available_free_space;
   if (align_content == kContentPositionCenter)
     return available_free_space / 2;
   if (align_content_distribution == kContentDistributionSpaceAround) {
     if (available_free_space > 0 && number_of_lines)
       return available_free_space / (2 * number_of_lines);
     if (available_free_space < 0)
       return available_free_space / 2;
   }
+  if (align_content_distribution == kContentDistributionSpaceEvenly) {
+    if (available_free_space > 0)
+      return available_free_space / (number_of_lines + 1);
+    // Fallback to 'center'

[Manuel Rego, 2017/04/20 08:57:06]

Ditto.

+    return available_free_space / 2;
+  }
   return LayoutUnit();
 }
 
 static LayoutUnit AlignContentSpaceBetweenChildren(
     LayoutUnit available_free_space,
     ContentDistributionType align_content_distribution,
     unsigned number_of_lines) {
   if (available_free_space > 0 && number_of_lines > 1) {
     if (align_content_distribution == kContentDistributionSpaceBetween)
       return available_free_space / (number_of_lines - 1);
     if (align_content_distribution == kContentDistributionSpaceAround ||
         align_content_distribution == kContentDistributionStretch)
       return available_free_space / number_of_lines;
+    if (align_content_distribution == kContentDistributionSpaceEvenly)
+      return available_free_space / (number_of_lines + 1);
   }
   return LayoutUnit();
 }
 
 void LayoutFlexibleBox::AlignFlexLines(Vector<LineContext>& line_contexts) {
   ContentPosition position =
       StyleRef().ResolvedAlignContentPosition(ContentAlignmentNormalBehavior());
   ContentDistributionType distribution =
       StyleRef().ResolvedAlignContentDistribution(
           ContentAlignmentNormalBehavior());
@@ skipping 211 matching lines @@
       LayoutUnit original_offset =
           line_contexts[line_number].cross_axis_offset - cross_axis_start_edge;
       LayoutUnit new_offset =
           content_extent - original_offset - line_cross_axis_extent;
       AdjustAlignmentForChild(*flex_item.box, new_offset - original_offset);
     }
   }
 }
 
 }  // namespace blink