Simplify <NavigationCard />.

Summary:Per offline discussion with ericvicenti,  we'd like to reudce the complexity by
keeping <NavigationCard /> nothing more than just a simple `<Animated.View />`,
which helps us to avoid over generalize the styles, gestures of what the Navigation card
needs to be.

The proposalis to use the same props (NavigationSceneRendererProps) that is used to render
the scene to generate the style and pan handlers needed for the navigation card.

No behavior changes, just implementation details clean up work.

Reviewed By: ericvicenti

Differential Revision: D3037225

fb-gh-sync-id: f6e718a282d25a319f5d8efd3e2ffebc66b2c8cb
shipit-source-id: f6e718a282d25a319f5d8efd3e2ffebc66b2c8cb

Libraries/CustomComponents/NavigationExperimental/NavigationCard.js

@@ -1,5 +1,10 @@
 /**
- * Copyright (c) 2015, Facebook, Inc.  All rights reserved.
+ * Copyright (c) 2013-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.
  *
  * Facebook, Inc. ("Facebook") owns all right, title and interest, including
  * all intellectual property and other proprietary rights, in and to the React
@@ -28,36 +33,24 @@
 'use strict';
 
 const Animated = require('Animated');
+const NavigationCardStackStyleInterpolator = require('NavigationCardStackStyleInterpolator');
 const NavigationContainer = require('NavigationContainer');
 const NavigationLinearPanResponder = require('NavigationLinearPanResponder');
 const NavigationPropTypes = require('NavigationPropTypes');
-const React = require('React');
+const React = require('react-native');
 const ReactComponentWithPureRenderMixin = require('ReactComponentWithPureRenderMixin');
 const StyleSheet = require('StyleSheet');
 const View = require('View');
 
-const {Directions} = NavigationLinearPanResponder;
-
 import type  {
-  NavigationAnimatedValue,
-  NavigationLayout,
-  NavigationPosition,
+  NavigationPanPanHandlers,
   NavigationSceneRenderer,
   NavigationSceneRendererProps,
 } from 'NavigationTypeDefinition';
 
-import type {
-  NavigationGestureDirection
-} from 'NavigationLinearPanResponder';
-
-type State = {
-  hash: string,
-  height: number,
-  width: number,
-};
-
 type Props = NavigationSceneRendererProps & {
-  direction: NavigationGestureDirection,
+  style: any,
+  panHandlers: ?NavigationPanPanHandlers,
   renderScene: NavigationSceneRenderer,
 };
 
@@ -65,78 +58,18 @@ const {PropTypes} = React;
 
 const propTypes = {
   ...NavigationPropTypes.SceneRenderer,
-  direction: PropTypes.oneOf([Directions.HORIZONTAL, Directions.VERTICAL]),
+  style: PropTypes.any,
+  panHandlers: NavigationPropTypes.panHandlers,
   renderScene: PropTypes.func.isRequired,
 };
 
-const defaultProps = {
-  direction: Directions.HORIZONTAL,
-};
-
-class AmimatedValueSubscription {
-  _value: NavigationAnimatedValue;
-  _token: string;
-
-  constructor(value: NavigationAnimatedValue, callback: Function) {
-    this._value = value;
-    this._token = value.addListener(callback);
-  }
-
-  remove() {
-    this._value.removeListener(this._token);
-  }
-}
-
-/**
- * Class that provides the required information for the
- * `NavigationLinearPanResponder`. This class must implement
- * the interface `NavigationLinearPanResponderDelegate`.
- */
-class PanResponderDelegate {
-  _props : Props;
-
-  constructor(props: Props) {
-    this._props = props;
-  }
-
-  getDirection(): NavigationGestureDirection {
-    return this._props.direction;
-  }
-
-  getIndex(): number {
-    return this._props.navigationState.index;
-  }
-
-  getLayout(): NavigationLayout {
-    return this._props.layout;
-  }
-
-  getPosition(): NavigationPosition {
-    return this._props.position;
-  }
-
-  onNavigate(action: {type: string}): void {
-    this._props.onNavigate && this._props.onNavigate(action);
-  }
-}
-
 /**
  * Component that renders the scene as card for the <NavigationCardStack />.
  */
-class NavigationCard extends React.Component {
+class NavigationCard extends React.Component<any, Props, any> {
   props: Props;
-  state: State;
-  _calculateState: (t: NavigationLayout) => State;
-  _layoutListeners: Array<AmimatedValueSubscription>;
 
-  constructor(props: Props, context: any) {
-    super(props, context);
-
-    this.state = this._calculateState(props.layout);
-    this._layoutListeners = [];
-  }
-
-  shouldComponentUpdate(nextProps: Object, nextState: Object): boolean {
+  shouldComponentUpdate(nextProps: Props, nextState: any): boolean {
     return ReactComponentWithPureRenderMixin.shouldComponentUpdate.call(
       this,
       nextProps,
@@ -144,130 +77,32 @@ class NavigationCard extends React.Component {
     );
   }
 
-  componentWillMount(): void {
-    this._calculateState = this._calculateState.bind(this);
-  }
-
-  componentDidMount(): void {
-    this._applyLayout(this.props.layout);
-  }
-
-  componentWillUnmount(): void {
-    this._layoutListeners.forEach(subscription => subscription.remove);
-  }
-
-  componentWillReceiveProps(nextProps: Props): void {
-    this._applyLayout(nextProps.layout);
-  }
-
   render(): ReactElement {
-    const {
-      direction,
-      layout,
-      navigationState,
-      onNavigate,
-      position,
-      scene,
-      scenes,
+    let {
+      style,
+      panHandlers,
+      renderScene,
+      ...props,
     } = this.props;
 
-    const {
-      height,
-      width,
-    } = this.state;
-
-    const index = scene.index;
-    const isVertical = direction === 'vertical';
-    const inputRange = [index - 1, index, index + 1];
-    const animatedStyle = {
-
-      opacity: position.interpolate({
-        inputRange,
-        outputRange: [1, 1, 0.3],
-      }),
-
-      transform: [
-        {
-          scale: position.interpolate({
-            inputRange,
-            outputRange: [1, 1, 0.95],
-          }),
-        },
-        {
-          translateX: isVertical ? 0 :
-            position.interpolate({
-              inputRange,
-              outputRange: [width, 0, -10],
-            }),
-        },
-        {
-          translateY: !isVertical ? 0 :
-            position.interpolate({
-              inputRange,
-              outputRange: [height, 0, -10],
-            }),
-        },
-      ],
-    };
-
-    let panHandlers = null;
-    if (navigationState.index === index) {
-      const delegate = new PanResponderDelegate(this.props);
-      const panResponder = new NavigationLinearPanResponder(delegate);
-      panHandlers = panResponder.panHandlers;
+    if (style === undefined) {
+      // fall back to default style.
+      style = NavigationCardStackStyleInterpolator.forHorizontal(props);
+    }
+    if (panHandlers === undefined) {
+      // fall back to default pan handlers.
+      panHandlers = NavigationLinearPanResponder.forHorizontal(props);
     }
-
-    const sceneProps = {
-      layout,
-      navigationState,
-      onNavigate,
-      position,
-      scene,
-      scenes,
-    };
 
     return (
-      <Animated.View
-        {...panHandlers}
-        style={[styles.main, animatedStyle]}>
-        {this.props.renderScene(sceneProps)}
+      <Animated.View {...panHandlers} style={[styles.main, style]}>
+        {renderScene(props)}
       </Animated.View>
     );
   }
-
-  _calculateState(layout: NavigationLayout): State {
-    const width = layout.width.__getValue();
-    const height = layout.height.__getValue();
-    const hash = 'layout-' + width + '-' + height;
-    const state = {
-      height,
-      width,
-      hash,
-    };
-    return state;
-  }
-
-  _applyLayout(layout: NavigationLayout) {
-    this._layoutListeners.forEach(subscription => subscription.remove);
-
-    this._layoutListeners.length = 0;
-
-    const callback = this._applyLayout.bind(this, layout);
-
-    this._layoutListeners.push(
-      new AmimatedValueSubscription(layout.width, callback),
-      new AmimatedValueSubscription(layout.height, callback),
-    );
-
-    const nextState = this._calculateState(layout);
-    if (nextState.hash !== this.state.hash) {
-      this.setState(nextState);
-    }
-  }
 }
 
 NavigationCard.propTypes = propTypes;
-NavigationCard.defaultProps = defaultProps;
 
 const styles = StyleSheet.create({
   main: {