Bug 1497589 Part 3: Stub in physical direction enums for Flex API main and cross axes. r=dholbert

Differential Revision: https://phabricator.services.mozilla.com/D8616

--HG--
extra : moz-landing-system : lando

dom/chrome-webidl/Flex.webidl

@@ -9,10 +9,33 @@
  * dev tools.
  */
 
+/**
+ * A flex container's main and cross axes are either horizontal or
+ * vertical, each with two possible directions.
+ */
+enum FlexPhysicalDirection {
+  "horizontal-lr",
+  "horizontal-rl",
+  "vertical-tb",
+  "vertical-bt",
+};
+
 [ChromeOnly]
 interface Flex
 {
   sequence<FlexLineValues> getLines();
+
+  /**
+   * The physical direction in which successive flex items are placed,
+   * within a flex line in this flex container.
+   */
+  readonly attribute FlexPhysicalDirection mainAxisDirection;
+
+  /**
+   * The physical direction in which successive flex lines are placed
+   * in this flex container (if it is or were multi-line).
+   */
+  readonly attribute FlexPhysicalDirection crossAxisDirection;
 };
 
 /**

dom/flex/Flex.cpp

@@ -55,5 +55,17 @@ Flex::GetLines(nsTArray<RefPtr<FlexLineValues>>& aResult)
   aResult.AppendElements(mLines);
 }
 
+FlexPhysicalDirection
+Flex::MainAxisDirection() const
+{
+  return mMainAxisDirection;
+}
+
+FlexPhysicalDirection
+Flex::CrossAxisDirection() const
+{
+  return mCrossAxisDirection;
+}
+
 } // namespace dom
 } // namespace mozilla

dom/flex/Flex.h

@@ -8,6 +8,7 @@
 #define mozilla_dom_Flex_h
 
 #include "mozilla/dom/Element.h"
+#include "mozilla/dom/FlexBinding.h"
 #include "nsISupports.h"
 #include "nsWrapperCache.h"
 
@@ -38,10 +39,14 @@ public:
   }
 
   void GetLines(nsTArray<RefPtr<FlexLineValues>>& aResult);
+  FlexPhysicalDirection MainAxisDirection() const;
+  FlexPhysicalDirection CrossAxisDirection() const;
 
 protected:
   nsCOMPtr<Element> mParent;
   nsTArray<RefPtr<FlexLineValues>> mLines;
+  FlexPhysicalDirection mMainAxisDirection;
+  FlexPhysicalDirection mCrossAxisDirection;
 };
 
 } // namespace dom