react-native/Libraries/CustomComponents/NavigationExperimental/NavigationCardStackItem.js

/**
 * Copyright (c) 2015, Facebook, Inc.  All rights reserved.
 *
 * Facebook, Inc. ("Facebook") owns all right, title and interest, including
 * all intellectual property and other proprietary rights, in and to the React
 * Native CustomComponents software (the "Software").  Subject to your
 * compliance with these terms, you are hereby granted a non-exclusive,
 * worldwide, royalty-free copyright license to (1) use and copy the Software;
 * and (2) reproduce and distribute the Software as part of your own software
 * ("Your Software").  Facebook reserves all rights not expressly granted to
 * you in this license agreement.
 *
 * THE SOFTWARE AND DOCUMENTATION, IF ANY, ARE PROVIDED "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES (INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE) ARE DISCLAIMED.
 * IN NO EVENT SHALL FACEBOOK OR ITS AFFILIATES, OFFICERS, DIRECTORS OR
 * EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THE SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @providesModule NavigationCardStackItem
 * @flow
 */
'use strict';

const Animated = require('Animated');
const NavigationContainer = require('NavigationContainer');
const React = require('React');
const StyleSheet = require('StyleSheet');
const View = require('View');
const ReactComponentWithPureRenderMixin = require('ReactComponentWithPureRenderMixin');

const {PropTypes} = React;

import type {
  NavigationParentState,
} from 'NavigationStateUtils';


import type {
  Layout,
  Position,
  NavigationStateRenderer,
} from 'NavigationAnimatedView';

type AnimatedValue = Animated.Value;

type Props = {
  direction: string,
  index: number;
  layout: Layout;
  navigationState: NavigationParentState;
  position: Position;
  renderScene: NavigationStateRenderer;
};

type State = {
  hash: string,
  height: number,
  width: number,
};

class AmimatedValueSubscription {
  _value: AnimatedValue;
  _token: string;

  constructor(value: AnimatedValue, callback: Function) {
    this._value = value;
    this._token = value.addListener(callback);
  }

  remove() {
    this._value.removeListener(this._token);
  }
}

/**
 * Component that renders the scene as card for the <NavigationCardStack />.
 */
class NavigationCardStackItem extends React.Component {
  props: Props;
  state: State;
  _calculateState: (t: Layout) => State;
  _layoutListeners: Array<AmimatedValueSubscription>;

  constructor(props: Props, context: any) {
    super(props, context);

    this._calculateState = this._calculateState.bind(this);
    this.state = this._calculateState(props.layout);
    this._layoutListeners = [];
  }

  shouldComponentUpdate(nextProps: Object, nextState: Object): boolean {
    return ReactComponentWithPureRenderMixin.shouldComponentUpdate.call(
      this,
      nextProps,
      nextState
    );
  }

  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,
      index,
      navigationState,
      position,
      layout,
    } = this.props;
    const {
      height,
      width,
    } = this.state;

    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],
            }),
        },
      ],
    };

    return (
      <Animated.View
        style={[styles.main, animatedStyle]}>
        {this.props.renderScene(this.props)}
      </Animated.View>
    );
  }

  _calculateState(layout: Layout): 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: Layout) {
    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);
    }
  }
}

const Directions = {
  HORIZONTAL: 'horizontal',
  VERTICAL: 'vertical',
};

NavigationCardStackItem.propTypes = {
  direction: PropTypes.oneOf([Directions.HORIZONTAL, Directions.VERTICAL]),
  index: PropTypes.number.isRequired,
  layout: PropTypes.object.isRequired,
  navigationState: PropTypes.object.isRequired,
  position: PropTypes.object.isRequired,
  renderScene: PropTypes.func.isRequired,
};

NavigationCardStackItem.defaultProps = {
  direction: Directions.HORIZONTAL,
};

NavigationCardStackItem = NavigationContainer.create(NavigationCardStackItem);

NavigationCardStackItem.Directions = Directions;

const styles = StyleSheet.create({
  main: {
    backgroundColor: '#E9E9EF',
    bottom: 0,
    left: 0,
    position: 'absolute',
    right: 0,
    shadowColor: 'black',
    shadowOffset: {width: 0, height: 0},
    shadowOpacity: 0.4,
    shadowRadius: 10,
    top: 0,
  },
});



module.exports = NavigationCardStackItem;