Support string color values in Animated.Color

Summary:
In addition to rgba values, allow creating Animated.Color with a string color.

Followup changes will include support for platform colors and native driver.

Changelog:
[General][Added] - Support string color values in Animated.Color

Reviewed By: javache

Differential Revision: D33810717

fbshipit-source-id: 208bc2675b6153a515fbf2122da15a065c473e73

Author: genkikondo

Libraries/Animated/__tests__/Animated-test.js

@@ -974,6 +974,37 @@ describe('Animated tests', () => {
   });
 
   describe('Animated Colors', () => {
+    it('should normalize colors', () => {
+      let color = new Animated.Color();
+      expect(color.__getValue()).toEqual('rgba(0, 0, 0, 1)');
+
+      color = new Animated.Color({r: 11, g: 22, b: 33, a: 1.0});
+      expect(color.__getValue()).toEqual('rgba(11, 22, 33, 1)');
+
+      color = new Animated.Color('rgba(255, 0, 0, 1.0)');
+      expect(color.__getValue()).toEqual('rgba(255, 0, 0, 1)');
+
+      color = new Animated.Color('#ff0000ff');
+      expect(color.__getValue()).toEqual('rgba(255, 0, 0, 1)');
+
+      color = new Animated.Color('red');
+      expect(color.__getValue()).toEqual('rgba(255, 0, 0, 1)');
+
+      color = new Animated.Color({
+        r: new Animated.Value(255),
+        g: new Animated.Value(0),
+        b: new Animated.Value(0),
+        a: new Animated.Value(1.0),
+      });
+      expect(color.__getValue()).toEqual('rgba(255, 0, 0, 1)');
+
+      color = new Animated.Color('unknown');
+      expect(color.__getValue()).toEqual('rgba(0, 0, 0, 1)');
+
+      color = new Animated.Color({key: 'value'});
+      expect(color.__getValue()).toEqual('rgba(0, 0, 0, 1)');
+    });
+
     it('should animate colors', () => {
       const color = new Animated.Color({r: 255, g: 0, b: 0, a: 1.0});
       const callback = jest.fn();

Libraries/Animated/nodes/AnimatedColor.js

@@ -12,12 +12,79 @@
 
 import AnimatedValue from './AnimatedValue';
 import AnimatedWithChildren from './AnimatedWithChildren';
-import invariant from 'invariant';
+import normalizeColor from '../../StyleSheet/normalizeColor';
+import {processColorObject} from '../../StyleSheet/PlatformColorValueTypes';
+
+import type {ColorValue} from '../../StyleSheet/StyleSheet';
+import type {NativeColorValue} from '../../StyleSheet/PlatformColorValueTypes';
 
 type ColorListenerCallback = (value: string) => mixed;
+type RgbaValue = {
+  +r: number,
+  +g: number,
+  +b: number,
+  +a: number,
+  ...
+};
+type RgbaAnimatedValue = {
+  +r: AnimatedValue,
+  +g: AnimatedValue,
+  +b: AnimatedValue,
+  +a: AnimatedValue,
+  ...
+};
 
+const defaultColor: RgbaValue = {r: 0, g: 0, b: 0, a: 1.0};
 let _uniqueId = 1;
 
+/* eslint no-bitwise: 0 */
+function processColor(color?: ?ColorValue): ?(RgbaValue | NativeColorValue) {
+  if (color === undefined || color === null) {
+    return null;
+  }
+
+  let normalizedColor = normalizeColor(color);
+  if (normalizedColor === undefined || normalizedColor === null) {
+    return null;
+  }
+
+  if (typeof normalizedColor === 'object') {
+    const processedColorObj = processColorObject(normalizedColor);
+    if (processedColorObj != null) {
+      return processedColorObj;
+    }
+  } else if (typeof normalizedColor === 'number') {
+    const r = (normalizedColor & 0xff000000) >>> 24;
+    const g = (normalizedColor & 0x00ff0000) >>> 16;
+    const b = (normalizedColor & 0x0000ff00) >>> 8;
+    const a = (normalizedColor & 0x000000ff) / 255;
+
+    return {r, g, b, a};
+  }
+
+  return null;
+}
+
+function isRgbaValue(value: any): boolean {
+  return (
+    value &&
+    typeof value.r === 'number' &&
+    typeof value.g === 'number' &&
+    typeof value.b === 'number' &&
+    typeof value.a === 'number'
+  );
+}
+
+function isRgbaAnimatedValue(value: any): boolean {
+  return (
+    value &&
+    value.r instanceof AnimatedValue &&
+    value.g instanceof AnimatedValue &&
+    value.b instanceof AnimatedValue &&
+    value.a instanceof AnimatedValue
+  );
+}
+
 export default class AnimatedColor extends AnimatedWithChildren {
   r: AnimatedValue;
   g: AnimatedValue;
@@ -34,39 +101,32 @@ export default class AnimatedColor extends AnimatedWithChildren {
     ...
   };
 
-  constructor(
-    valueIn?: ?{
-      +r: number | AnimatedValue,
-      +g: number | AnimatedValue,
-      +b: number | AnimatedValue,
-      +a: number | AnimatedValue,
-      ...
-    }, // TODO: support string color and platform color
-  ) {
+  constructor(valueIn?: ?(RgbaValue | RgbaAnimatedValue | ColorValue)) {
     super();
-    const value: any = valueIn || {r: 0, g: 0, b: 0, a: 1}; // @flowfixme: shouldn't need `: any`
-    if (
-      typeof value.r === 'number' &&
-      typeof value.g === 'number' &&
-      typeof value.b === 'number' &&
-      typeof value.a === 'number'
-    ) {
-      this.r = new AnimatedValue(value.r);
-      this.g = new AnimatedValue(value.g);
-      this.b = new AnimatedValue(value.b);
-      this.a = new AnimatedValue(value.a);
+    let value: RgbaValue | RgbaAnimatedValue | ColorValue =
+      valueIn || defaultColor;
+
+    if (isRgbaAnimatedValue(value)) {
+      // $FlowIgnore[incompatible-cast] - Type is verified above
+      const rgbaAnimatedValue: RgbaAnimatedValue = (value: RgbaAnimatedValue);
+      this.r = rgbaAnimatedValue.r;
+      this.g = rgbaAnimatedValue.g;
+      this.b = rgbaAnimatedValue.b;
+      this.a = rgbaAnimatedValue.a;
     } else {
-      invariant(
-        value.r instanceof AnimatedValue &&
-          value.g instanceof AnimatedValue &&
-          value.b instanceof AnimatedValue &&
-          value.a instanceof AnimatedValue,
-        'AnimatedColor must be initialized with an object of numbers or AnimatedValues.',
-      );
-      this.r = value.r;
-      this.g = value.g;
-      this.b = value.b;
-      this.a = value.a;
+      // Handle potential parsable string color or platform color object
+      if (!isRgbaValue(value)) {
+        // $FlowIgnore[incompatible-cast] - Type is verified via conditionals
+        value = processColor((value: ColorValue)) || {r: 0, g: 0, b: 0, a: 1.0};
+        // TODO: support platform color
+      }
+
+      // $FlowIgnore[incompatible-cast] - Type is verified via conditionals
+      const rgbaValue: RgbaValue = (value: RgbaValue);
+      this.r = new AnimatedValue(rgbaValue.r);
+      this.g = new AnimatedValue(rgbaValue.g);
+      this.b = new AnimatedValue(rgbaValue.b);
+      this.a = new AnimatedValue(rgbaValue.a);
     }
     this._listeners = {};
   }
@@ -75,7 +135,7 @@ export default class AnimatedColor extends AnimatedWithChildren {
    * Directly set the value. This will stop any animations running on the value
    * and update all the bound properties.
    */
-  setValue(value: {r: number, g: number, b: number, a: number, ...}) {
+  setValue(value: {r: number, g: number, b: number, a: number, ...}): void {
     this.r.setValue(value.r);
     this.g.setValue(value.g);
     this.b.setValue(value.b);
@@ -87,7 +147,7 @@ export default class AnimatedColor extends AnimatedWithChildren {
    * via `setValue`, an animation, or `Animated.event`. Useful for compensating
    * things like the start of a pan gesture.
    */
-  setOffset(offset: {r: number, g: number, b: number, a: number, ...}) {
+  setOffset(offset: {r: number, g: number, b: number, a: number, ...}): void {
     this.r.setOffset(offset.r);
     this.g.setOffset(offset.g);
     this.b.setOffset(offset.b);