Add feature to use percentage as value unit

Summary:
Adds the feature to use percentage as a value unit.

You can use the function ```YGPx(float)``` and ```YGPercent(float)``` for convenience.

I did some benchmarks:

```
Without Percentage Feature - Release x86:

Stack with flex: median: 0.000000 ms, stddev: 0.146683 ms
Align stretch in undefined axis: median: 0.000000 ms, stddev: 0.136525 ms
Nested flex: median: 0.000000 ms, stddev: 0.490101 ms
Huge nested layout: median: 23.000000 ms, stddev: 0.928291 ms

Stack with flex: median: 0.000000 ms, stddev: 0.170587 ms
Align stretch in undefined axis: median: 0.000000 ms, stddev: 0.143384 ms
Nested flex: median: 0.000000 ms, stddev: 0.477791 ms
Huge nested layout: median: 22.000000 ms, stddev: 2.129779 ms

With Percentage Feature - Release x86:

Stack with flex: median: 0.000000 ms, stddev: 0.132951 ms
Align stretch in undefined axis: median: 0.000000 ms, stddev: 0.136525 ms
Nested flex: median: 0.000000 ms, stddev: 0.489570 ms
Huge nested layout: median: 21.000000 ms, stddev: 1.390476 ms
Closes https://github.com/facebook/yoga/pull/258

Reviewed By: dshahidehpour

Differential Revision: D4361945

Pulled By: emilsjolander

fbshipit-source-id: a8f5bc63ad352eb9410d792729e56664468cd76a

java/com/facebook/yoga/YogaConstants.java

@@ -16,4 +16,8 @@ public class YogaConstants {
   public static boolean isUndefined(float value) {
     return Float.compare(value, UNDEFINED) == 0;
   }
+
+  public static boolean isUndefined(YogaValue value) {
+    return value.unit == YogaUnit.UNDEFINED;
+  }
 }

java/com/facebook/yoga/YogaNode.java

@@ -323,10 +323,10 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetFlexShrink(mNativePointer, flexShrink);
   }
 
-  private native float jni_YGNodeStyleGetFlexBasis(long nativePointer);
+  private native Object jni_YGNodeStyleGetFlexBasis(long nativePointer);
   @Override
-  public float getFlexBasis() {
-    return jni_YGNodeStyleGetFlexBasis(mNativePointer);
+  public YogaValue getFlexBasis() {
+    return (YogaValue) jni_YGNodeStyleGetFlexBasis(mNativePointer);
   }
 
   private native void jni_YGNodeStyleSetFlexBasis(long nativePointer, float flexBasis);
@@ -335,13 +335,19 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetFlexBasis(mNativePointer, flexBasis);
   }
 
-  private native float jni_YGNodeStyleGetMargin(long nativePointer, int edge);
+  private native void jni_YGNodeStyleSetFlexBasisPercent(long nativePointer, float percent);
   @Override
-  public float getMargin(YogaEdge edge) {
+  public void setFlexBasisPercent(float percent) {
+    jni_YGNodeStyleSetFlexBasisPercent(mNativePointer, percent);
+  }
+
+  private native Object jni_YGNodeStyleGetMargin(long nativePointer, int edge);
+  @Override
+  public YogaValue getMargin(YogaEdge edge) {
     if (!mHasSetMargin) {
-      return edge.intValue() < YogaEdge.START.intValue() ? 0 : YogaConstants.UNDEFINED;
+      return edge.intValue() < YogaEdge.START.intValue() ? YogaValue.ZERO : YogaValue.UNDEFINED;
     }
-    return jni_YGNodeStyleGetMargin(mNativePointer, edge.intValue());
+    return (YogaValue) jni_YGNodeStyleGetMargin(mNativePointer, edge.intValue());
   }
 
   private native void jni_YGNodeStyleSetMargin(long nativePointer, int edge, float margin);
@@ -351,13 +357,20 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetMargin(mNativePointer, edge.intValue(), margin);
   }
 
-  private native float jni_YGNodeStyleGetPadding(long nativePointer, int edge);
+  private native void jni_YGNodeStyleSetMarginPercent(long nativePointer, int edge, float percent);
   @Override
-  public float getPadding(YogaEdge edge) {
+  public void setMarginPercent(YogaEdge edge, float percent) {
+    mHasSetMargin = true;
+    jni_YGNodeStyleSetMarginPercent(mNativePointer, edge.intValue(), percent);
+  }
+
+  private native Object jni_YGNodeStyleGetPadding(long nativePointer, int edge);
+  @Override
+  public YogaValue getPadding(YogaEdge edge) {
     if (!mHasSetPadding) {
-      return edge.intValue() < YogaEdge.START.intValue() ? 0 : YogaConstants.UNDEFINED;
+      return edge.intValue() < YogaEdge.START.intValue() ? YogaValue.ZERO : YogaValue.UNDEFINED;
     }
-    return jni_YGNodeStyleGetPadding(mNativePointer, edge.intValue());
+    return (YogaValue) jni_YGNodeStyleGetPadding(mNativePointer, edge.intValue());
   }
 
   private native void jni_YGNodeStyleSetPadding(long nativePointer, int edge, float padding);
@@ -367,6 +380,13 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetPadding(mNativePointer, edge.intValue(), padding);
   }
 
+  private native void jni_YGNodeStyleSetPaddingPercent(long nativePointer, int edge, float percent);
+  @Override
+  public void setPaddingPercent(YogaEdge edge, float percent) {
+    mHasSetPadding = true;
+    jni_YGNodeStyleSetPaddingPercent(mNativePointer, edge.intValue(), percent);
+  }
+
   private native float jni_YGNodeStyleGetBorder(long nativePointer, int edge);
   @Override
   public float getBorder(YogaEdge edge) {
@@ -383,13 +403,13 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetBorder(mNativePointer, edge.intValue(), border);
   }
 
-  private native float jni_YGNodeStyleGetPosition(long nativePointer, int edge);
+  private native Object jni_YGNodeStyleGetPosition(long nativePointer, int edge);
   @Override
-  public float getPosition(YogaEdge edge) {
+  public YogaValue getPosition(YogaEdge edge) {
     if (!mHasSetPosition) {
-      return YogaConstants.UNDEFINED;
+      return YogaValue.UNDEFINED;
     }
-    return jni_YGNodeStyleGetPosition(mNativePointer, edge.intValue());
+    return (YogaValue) jni_YGNodeStyleGetPosition(mNativePointer, edge.intValue());
   }
 
   private native void jni_YGNodeStyleSetPosition(long nativePointer, int edge, float position);
@@ -399,10 +419,17 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetPosition(mNativePointer, edge.intValue(), position);
   }
 
-  private native float jni_YGNodeStyleGetWidth(long nativePointer);
+  private native void jni_YGNodeStyleSetPositionPercent(long nativePointer, int edge, float percent);
   @Override
-  public float getWidth() {
-    return jni_YGNodeStyleGetWidth(mNativePointer);
+  public void setPositionPercent(YogaEdge edge, float percent) {
+    mHasSetPosition = true;
+    jni_YGNodeStyleSetPositionPercent(mNativePointer, edge.intValue(), percent);
+  }
+
+  private native Object jni_YGNodeStyleGetWidth(long nativePointer);
+  @Override
+  public YogaValue getWidth() {
+    return (YogaValue) jni_YGNodeStyleGetWidth(mNativePointer);
   }
 
   private native void jni_YGNodeStyleSetWidth(long nativePointer, float width);
@@ -411,10 +438,16 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetWidth(mNativePointer, width);
   }
 
-  private native float jni_YGNodeStyleGetHeight(long nativePointer);
+  private native void jni_YGNodeStyleSetWidthPercent(long nativePointer, float percent);
   @Override
-  public float getHeight() {
-    return jni_YGNodeStyleGetHeight(mNativePointer);
+  public void setWidthPercent(float percent) {
+    jni_YGNodeStyleSetWidthPercent(mNativePointer, percent);
+  }
+
+  private native Object jni_YGNodeStyleGetHeight(long nativePointer);
+  @Override
+  public YogaValue getHeight() {
+    return (YogaValue) jni_YGNodeStyleGetHeight(mNativePointer);
   }
 
   private native void jni_YGNodeStyleSetHeight(long nativePointer, float height);
@@ -423,10 +456,16 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetHeight(mNativePointer, height);
   }
 
-  private native float jni_YGNodeStyleGetMinWidth(long nativePointer);
+  private native void jni_YGNodeStyleSetHeightPercent(long nativePointer, float percent);
   @Override
-  public float getMinWidth() {
-    return jni_YGNodeStyleGetMinWidth(mNativePointer);
+  public void setHeightPercent(float percent) {
+    jni_YGNodeStyleSetHeightPercent(mNativePointer, percent);
+  }
+
+  private native Object jni_YGNodeStyleGetMinWidth(long nativePointer);
+  @Override
+  public YogaValue getMinWidth() {
+    return (YogaValue) jni_YGNodeStyleGetMinWidth(mNativePointer);
   }
 
   private native void jni_YGNodeStyleSetMinWidth(long nativePointer, float minWidth);
@@ -435,10 +474,16 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetMinWidth(mNativePointer, minWidth);
   }
 
-  private native float jni_YGNodeStyleGetMinHeight(long nativePointer);
+  private native void jni_YGNodeStyleSetMinWidthPercent(long nativePointer, float percent);
   @Override
-  public float getMinHeight() {
-    return jni_YGNodeStyleGetMinHeight(mNativePointer);
+  public void setMinWidthPercent(float percent) {
+    jni_YGNodeStyleSetMinWidthPercent(mNativePointer, percent);
+  }
+
+  private native Object jni_YGNodeStyleGetMinHeight(long nativePointer);
+  @Override
+  public YogaValue getMinHeight() {
+    return (YogaValue) jni_YGNodeStyleGetMinHeight(mNativePointer);
   }
 
   private native void jni_YGNodeStyleSetMinHeight(long nativePointer, float minHeight);
@@ -447,10 +492,16 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetMinHeight(mNativePointer, minHeight);
   }
 
-  private native float jni_YGNodeStyleGetMaxWidth(long nativePointer);
+  private native void jni_YGNodeStyleSetMinHeightPercent(long nativePointer, float percent);
   @Override
-  public float getMaxWidth() {
-    return jni_YGNodeStyleGetMaxWidth(mNativePointer);
+  public void setMinHeightPercent(float percent) {
+    jni_YGNodeStyleSetMinHeightPercent(mNativePointer, percent);
+  }
+
+  private native Object jni_YGNodeStyleGetMaxWidth(long nativePointer);
+  @Override
+  public YogaValue getMaxWidth() {
+    return (YogaValue) jni_YGNodeStyleGetMaxWidth(mNativePointer);
   }
 
   private native void jni_YGNodeStyleSetMaxWidth(long nativePointer, float maxWidth);
@@ -459,10 +510,16 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetMaxWidth(mNativePointer, maxWidth);
   }
 
-  private native float jni_YGNodeStyleGetMaxHeight(long nativePointer);
+  private native void jni_YGNodeStyleSetMaxWidthPercent(long nativePointer, float percent);
   @Override
-  public float getMaxHeight() {
-    return jni_YGNodeStyleGetMaxHeight(mNativePointer);
+  public void setMaxWidthPercent(float percent) {
+    jni_YGNodeStyleSetMaxWidthPercent(mNativePointer, percent);
+  }
+
+  private native Object jni_YGNodeStyleGetMaxHeight(long nativePointer);
+  @Override
+  public YogaValue getMaxHeight() {
+    return (YogaValue) jni_YGNodeStyleGetMaxHeight(mNativePointer);
   }
 
   private native void jni_YGNodeStyleSetMaxHeight(long nativePointer, float maxheight);
@@ -471,6 +528,12 @@ public class YogaNode implements YogaNodeAPI<YogaNode> {
     jni_YGNodeStyleSetMaxHeight(mNativePointer, maxheight);
   }
 
+  private native void jni_YGNodeStyleSetMaxHeightPercent(long nativePointer, float percent);
+  @Override
+  public void setMaxHeightPercent(float percent) {
+    jni_YGNodeStyleSetMaxHeightPercent(mNativePointer, percent);
+  }
+
   private native float jni_YGNodeStyleGetAspectRatio(long nativePointer);
   public float getAspectRatio() {
     return jni_YGNodeStyleGetAspectRatio(mNativePointer);

java/com/facebook/yoga/YogaNodeAPI.java

@@ -45,28 +45,38 @@ public interface YogaNodeAPI<YogaNodeType extends YogaNodeAPI> {
   void setFlexGrow(float flexGrow);
   float getFlexShrink();
   void setFlexShrink(float flexShrink);
-  float getFlexBasis();
+  YogaValue getFlexBasis();
   void setFlexBasis(float flexBasis);
-  float getMargin(YogaEdge edge);
+  void setFlexBasisPercent(float percent);
+  YogaValue getMargin(YogaEdge edge);
   void setMargin(YogaEdge edge, float margin);
-  float getPadding(YogaEdge edge);
+  void setMarginPercent(YogaEdge edge, float percent);
+  YogaValue getPadding(YogaEdge edge);
   void setPadding(YogaEdge edge, float padding);
+  void setPaddingPercent(YogaEdge edge, float percent);
   float getBorder(YogaEdge edge);
   void setBorder(YogaEdge edge, float border);
-  float getPosition(YogaEdge edge);
+  YogaValue getPosition(YogaEdge edge);
   void setPosition(YogaEdge edge, float position);
-  float getWidth();
+  void setPositionPercent(YogaEdge edge, float percent);
+  YogaValue getWidth();
   void setWidth(float width);
-  float getHeight();
+  void setWidthPercent(float percent);
+  YogaValue getHeight();
   void setHeight(float height);
-  float getMaxWidth();
+  void setHeightPercent(float percent);
+  YogaValue getMaxWidth();
   void setMaxWidth(float maxWidth);
-  float getMinWidth();
+  void setMaxWidthPercent(float percent);
+  YogaValue getMinWidth();
   void setMinWidth(float minWidth);
-  float getMaxHeight();
+  void setMinWidthPercent(float percent);
+  YogaValue getMaxHeight();
   void setMaxHeight(float maxHeight);
-  float getMinHeight();
+  void setMaxHeightPercent(float percent);
+  YogaValue getMinHeight();
   void setMinHeight(float minHeight);
+  void setMinHeightPercent(float percent);
   float getLayoutX();
   float getLayoutY();
   float getLayoutWidth();

java/com/facebook/yoga/YogaUnit.java

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.yoga;
+
+import com.facebook.proguard.annotations.DoNotStrip;
+
+@DoNotStrip
+public enum YogaUnit {
+  UNDEFINED(0),
+  PIXEL(1),
+  PERCENT(2);
+
+  private int mIntValue;
+
+  YogaUnit(int intValue) {
+    mIntValue = intValue;
+  }
+
+  public int intValue() {
+    return mIntValue;
+  }
+
+  public static YogaUnit fromInt(int value) {
+    switch (value) {
+      case 0: return UNDEFINED;
+      case 1: return PIXEL;
+      case 2: return PERCENT;
+      default: throw new IllegalArgumentException("Unkown enum value: " + value);
+    }
+  }
+}

java/com/facebook/yoga/YogaValue.java

@@ -0,0 +1,45 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.yoga;
+
+import com.facebook.proguard.annotations.DoNotStrip;
+
+@DoNotStrip
+public class YogaValue {
+  static final YogaValue UNDEFINED = new YogaValue(YogaConstants.UNDEFINED, YogaUnit.UNDEFINED);
+  static final YogaValue ZERO = new YogaValue(0, YogaUnit.PIXEL);
+
+  public final float value;
+  public final YogaUnit unit;
+
+  YogaValue(float value, YogaUnit unit) {
+    this.value = value;
+    this.unit = unit;
+  }
+
+  @DoNotStrip
+  YogaValue(float value, int unit) {
+    this(value, YogaUnit.fromInt(unit));
+  }
+
+  @Override
+  public boolean equals(Object other) {
+    if (other instanceof YogaValue) {
+      final YogaValue otherValue = (YogaValue) other;
+      return value == otherValue.value && unit == otherValue.unit;
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Float.floatToIntBits(value) + unit.intValue();
+  }
+}