Added property display: flex and none

Summary:
Fix #241 and successor for #302

Added new property ```display``` with ```YGDisplayFlex``` and ```YGDisplayNone```. Allows to hide nodes from the layout without the need to remove it from the DOM.
Closes https://github.com/facebook/yoga/pull/369

Reviewed By: astreet

Differential Revision: D4501141

Pulled By: emilsjolander

fbshipit-source-id: 0dfeee381f6d1e4bbba81926126b83dd7abab9d6

javascript/sources/Node.cc

@@ -124,6 +124,11 @@ void Node::setOverflow(int overflow)
     YGNodeStyleSetOverflow(m_node, static_cast<YGOverflow>(overflow));
 }
 
+void Node::setDisplay(int display)
+{
+    YGNodeStyleSetDisplay(m_node, static_cast<YGDisplay>(display));
+}
+
 void Node::setFlex(double flex)
 {
     YGNodeStyleSetFlex(m_node, flex);
@@ -279,6 +284,11 @@ int Node::getOverflow(void) const
     return YGNodeStyleGetOverflow(m_node);
 }
 
+int Node::getDisplay(void) const
+{
+    return YGNodeStyleGetDisplay(m_node);
+}
+
 Value Node::getFlexBasis(void) const
 {
     return Value::fromYGValue(YGNodeStyleGetFlexBasis(m_node));

javascript/sources/Node.hh

@@ -67,6 +67,7 @@ class Node {
     void setMarginPercent(int edge, double margin);
 
     void setOverflow(int overflow);
+    void setDisplay(int display);
 
     void setFlex(double flex);
     void setFlexBasis(double flexBasis);
@@ -111,6 +112,7 @@ class Node {
     Value getMargin(int edge) const;
 
     int getOverflow(void) const;
+    int getDisplay(void) const;
 
     Value getFlexBasis(void) const;
     double getFlexGrow(void) const;

javascript/sources/YGEnums.js

@@ -26,6 +26,10 @@ module.exports = {
   DIRECTION_LTR: 1,
   DIRECTION_RTL: 2,
 
+  DISPLAY_COUNT: 2,
+  DISPLAY_FLEX: 0,
+  DISPLAY_NONE: 1,
+
   EDGE_COUNT: 9,
   EDGE_LEFT: 0,
   EDGE_TOP: 1,

javascript/sources/nbind.cc

@@ -67,6 +67,7 @@ NBIND_CLASS(Node)
     method(setMarginPercent);
 
     method(setOverflow);
+    method(setDisplay);
 
     method(setFlex);
     method(setFlexBasis);
@@ -125,6 +126,9 @@ NBIND_CLASS(Node)
 
     method(getBorder);
 
+    method(getOverflow);
+    method(getDisplay);
+
     method(getPadding);
 
     method(insertChild);