MapMarker.js

import React, { PropTypes } from 'react';
import {
  View,
  StyleSheet,
  Platform,
  NativeModules,
  Animated,
  findNodeHandle,
} from 'react-native';

import resolveAssetSource from 'react-native/Libraries/Image/resolveAssetSource';
import decorateMapComponent, {
  SUPPORTED,
  USES_DEFAULT_IMPLEMENTATION,
} from './decorateMapComponent';

const viewConfig = {
  uiViewClassName: 'AIR<provider>MapMarker',
  validAttributes: {
    coordinate: true,
  },
};

const propTypes = {
  ...View.propTypes,

  // TODO(lmr): get rid of these?
  identifier: PropTypes.string,
  reuseIdentifier: PropTypes.string,

  /**
   * The title of the marker. This is only used if the <Marker /> component has no children that
   * are an `<MapView.Callout />`, in which case the default callout behavior will be used, which
   * will show both the `title` and the `description`, if provided.
   */
  title: PropTypes.string,

  /**
   * The description of the marker. This is only used if the <Marker /> component has no children
   * that are an `<MapView.Callout />`, in which case the default callout behavior will be used,
   * which will show both the `title` and the `description`, if provided.
   */
  description: PropTypes.string,

  /**
   * A custom image to be used as the marker's icon. Only local image resources are allowed to be
   * used.
   */
  image: PropTypes.any,

  /**
   * If no custom marker view or custom image is provided, the platform default pin will be used,
   * which can be customized by this color. Ignored if a custom marker is being used.
   */
  pinColor: PropTypes.string,

  /**
   * The coordinate for the marker.
   */
  coordinate: PropTypes.shape({
    /**
     * Coordinates for the anchor point of the marker.
     */
    latitude: PropTypes.number.isRequired,
    longitude: PropTypes.number.isRequired,
  }).isRequired,

  /**
   * The offset (in points) at which to display the view.
   *
   * By default, the center point of an annotation view is placed at the coordinate point of the
   * associated annotation. You can use this property to reposition the annotation view as
   * needed. This x and y offset values are measured in points. Positive offset values move the
   * annotation view down and to the right, while negative values move it up and to the left.
   *
   * For android, see the `anchor` prop.
   *
   * @platform ios
   */
  centerOffset: PropTypes.shape({
    /**
     * Offset from the anchor point
     */
    x: PropTypes.number.isRequired,
    y: PropTypes.number.isRequired,
  }),

  /**
   * The offset (in points) at which to place the callout bubble.
   *
   * This property determines the additional distance by which to move the callout bubble. When
   * this property is set to (0, 0), the anchor point of the callout bubble is placed on the
   * top-center point of the marker view’s frame. Specifying positive offset values moves the
   * callout bubble down and to the right, while specifying negative values moves it up and to
   * the left.
   *
   * For android, see the `calloutAnchor` prop.
   *
   * @platform ios
   */
  calloutOffset: PropTypes.shape({
    /**
     * Offset to the callout
     */
    x: PropTypes.number.isRequired,
    y: PropTypes.number.isRequired,
  }),

  /**
   * Sets the anchor point for the marker.
   *
   * The anchor specifies the point in the icon image that is anchored to the marker's position
   * on the Earth's surface.
   *
   * The anchor point is specified in the continuous space [0.0, 1.0] x [0.0, 1.0], where (0, 0)
   * is the top-left corner of the image, and (1, 1) is the bottom-right corner. The anchoring
   * point in a W x H image is the nearest discrete grid point in a (W + 1) x (H + 1) grid,
   * obtained by scaling the then rounding. For example, in a 4 x 2 image, the anchor point
   * (0.7, 0.6) resolves to the grid point at (3, 1).
   *
   * For ios, see the `centerOffset` prop.
   *
   * @platform android
   */
  anchor: PropTypes.shape({
    /**
     * Offset to the callout
     */
    x: PropTypes.number.isRequired,
    y: PropTypes.number.isRequired,
  }),

  /**
   * Specifies the point in the marker image at which to anchor the callout when it is displayed.
   * This is specified in the same coordinate system as the anchor. See the `andor` prop for more
   * details.
   *
   * The default is the top middle of the image.
   *
   * For ios, see the `calloutOffset` prop.
   *
   * @platform android
   */
  calloutAnchor: PropTypes.shape({
    /**
     * Offset to the callout
     */
    x: PropTypes.number.isRequired,
    y: PropTypes.number.isRequired,
  }),

  /**
   * Sets whether this marker should be flat against the map true or a billboard facing the
   * camera false.
   *
   * @platform android
   */
  flat: PropTypes.bool,

  draggable: PropTypes.bool,

  /**
   * Callback that is called when the user presses on the marker
   */
  onPress: PropTypes.func,

  /**
   * Callback that is called when the user selects the marker, before the callout is shown.
   *
   * @platform ios
   */
  onSelect: PropTypes.func,

  /**
   * Callback that is called when the marker is deselected, before the callout is hidden.
   *
   * @platform ios
   */
  onDeselect: PropTypes.func,

  /**
   * Callback that is called when the user taps the callout view.
   */
  onCalloutPress: PropTypes.func,

  /**
   * Callback that is called when the user initiates a drag on this marker (if it is draggable)
   */
  onDragStart: PropTypes.func,

  /**
   * Callback called continuously as the marker is dragged
   */
  onDrag: PropTypes.func,

  /**
   * Callback that is called when a drag on this marker finishes. This is usually the point you
   * will want to setState on the marker's coordinate again
   */
  onDragEnd: PropTypes.func,
};

const defaultProps = {
  onPress() {},
};

class MapMarker extends React.Component {
  constructor(props) {
    super(props);

    this.showCallout = this.showCallout.bind(this);
    this.hideCallout = this.hideCallout.bind(this);
  }

  showCallout() {
    this._runCommand('showCallout', []);
  }

  hideCallout() {
    this._runCommand('hideCallout', []);
  }

  _getHandle() {
    return findNodeHandle(this.marker);
  }

  _runCommand(name, args) {
    switch (Platform.OS) {
      case 'android':
        NativeModules.UIManager.dispatchViewManagerCommand(
          this._getHandle(),
          this.getUIManagerCommand(name),
          args
        );
        break;

      case 'ios':
        this.getMapManagerCommand(name)(this._getHandle(), ...args);
        break;

      default:
        break;
    }
  }

  render() {
    let image;
    if (this.props.image) {
      image = resolveAssetSource(this.props.image) || {};
      image = image.uri;
    }

    const AIRMapMarker = this.getAirComponent();

    return (
      <AIRMapMarker
        ref={ref => { this.marker = ref; }}
        {...this.props}
        image={image}
        style={[styles.marker, this.props.style]}
      />
    );
  }
}

MapMarker.propTypes = propTypes;
MapMarker.defaultProps = defaultProps;
MapMarker.viewConfig = viewConfig;

const styles = StyleSheet.create({
  marker: {
    position: 'absolute',
    backgroundColor: 'transparent',
  },
});

MapMarker.Animated = Animated.createAnimatedComponent(MapMarker);

module.exports = decorateMapComponent(MapMarker, {
  componentType: 'Marker',
  providers: {
    google: {
      ios: SUPPORTED,
      android: USES_DEFAULT_IMPLEMENTATION,
    },
  },
});