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bower_components/google-map/google-map.html 20.9 KB
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  <!-- Copyright (c) 2015 Google Inc. All rights reserved. -->
  
  <link rel="import" href="../polymer/polymer.html">
  <link rel="import" href="../google-apis/google-maps-api.html">
  <link rel="import" href="../iron-resizable-behavior/iron-resizable-behavior.html">
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  <link rel="import" href="../iron-selector/iron-selector.html">
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  <link rel="import" href="google-map-marker.html">
  <!--
  The `google-map` element renders a Google Map.
  
  <b>Example</b>:
  
      <style>
        google-map {
          height: 600px;
        }
      </style>
      <google-map latitude="37.77493" longitude="-122.41942"></google-map>
  
  <b>Example</b> - add markers to the map and ensure they're in view:
  
      <google-map latitude="37.77493" longitude="-122.41942" fit-to-markers>
        <google-map-marker latitude="37.779" longitude="-122.3892"
            draggable="true" title="Go Giants!"></google-map-marker>
        <google-map-marker latitude="37.777" longitude="-122.38911"></google-map-marker>
      </google-map>
  
  <b>Example</b>:
  
      <google-map disable-default-ui zoom="15"></google-map>
      <script>
        var map = document.querySelector('google-map');
        map.latitude = 37.77493;
        map.longitude = -122.41942;
        map.addEventListener('google-map-ready', function(e) {
          alert('Map loaded!');
        });
      </script>
  
  <b>Example</b> - with Google directions, using data-binding inside another Polymer element
  
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      <google-map map="{{map}}"></google-map>
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      <google-map-directions map="{{map}}"
          start-address="San Francisco" end-address="Mountain View">
      </google-map-directions>
  
  @demo
  -->
  
  <dom-module id="google-map">
  
    <style>
      :host {
        position: relative;
        display: block;
        height: 100%;
      }
  
      #map {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
      }
  
    </style>
    <template>
      <google-maps-api id="api"
        api-key="[[apiKey]]"
        client-id="[[clientId]]"
        version="[[version]]"
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        signed-in="[[signedIn]]"
        language="[[language]]"
        on-api-load="_mapApiLoaded"></google-maps-api>
  
      <div id="map"></div>
  
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      <iron-selector id="selector" multi="[[!singleInfoWindow]]" selected-attribute="open" activate-event="google-map-marker-open" on-google-map-marker-close="_deselectMarker">
        <content id="markers" select="google-map-marker"></content>
      </iron-selector>
      <content id="objects" select="*"></content>
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    </template>
  </dom-module>
  
  <script>
  
    Polymer({
  
      is: 'google-map',
  
  
      /**
       * Fired when the Maps API has fully loaded.
       * @event google-map-ready
       */
      /**
       * Fired when the when the user clicks on the map (but not when they click on a marker, infowindow, or
       * other object). Requires the clickEvents attribute to be true.
       * @event google-map-click
       * @param {google.maps.MouseEvent} event The mouse event.
       */
      /**
       * Fired when the user double-clicks on the map. Note that the google-map-click event will also fire,
       * right before this one. Requires the clickEvents attribute to be true.
       * @event google-map-dblclick
       * @param {google.maps.MouseEvent} event The mouse event.
       */
      /**
       * Fired repeatedly while the user drags the map. Requires the dragEvents attribute to be true.
       * @event google-map-drag
       */
      /**
       * Fired when the user stops dragging the map. Requires the dragEvents attribute to be true.
       * @event google-map-dragend
       */
      /**
       * Fired when the user starts dragging the map. Requires the dragEvents attribute to be true.
       * @event google-map-dragstart
       */
      /**
       * Fired whenever the user's mouse moves over the map container. Requires the mouseEvents attribute to
       * be true.
       * @event google-map-mousemove
       * @param {google.maps.MouseEvent} event The mouse event.
       */
      /**
       * Fired when the user's mouse exits the map container. Requires the mouseEvents attribute to be true.
       * @event google-map-mouseout
       * @param {google.maps.MouseEvent} event The mouse event.
       */
      /**
       * Fired when the user's mouse enters the map container. Requires the mouseEvents attribute to be true.
       * @event google-map-mouseover
       * @param {google.maps.MouseEvent} event The mouse event.
       */
      /**
       * Fired when the DOM `contextmenu` event is fired on the map container. Requires the clickEvents
       * attribute to be true.
       * @event google-map-rightclick
       * @param {google.maps.MouseEvent} event The mouse event.
       */
      properties: {
        /**
         * A Maps API key. To obtain an API key, see developers.google.com/maps/documentation/javascript/tutorial#api_key.
         */
        apiKey: String,
  
        /**
         * A Maps API for Business Client ID. To obtain a Maps API for Business Client ID, see developers.google.com/maps/documentation/business/.
         * If set, a Client ID will take precedence over an API Key.
         */
        clientId: String,
  
        /**
         * A latitude to center the map on.
         */
        latitude: {
          type: Number,
          value: 37.77493,
          notify: true,
          reflectToAttribute: true
        },
  
        /**
         * A Maps API object.
         */
        map: {
          type: Object,
          notify: true,
          value: null
        },
  
        /**
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         * A longitude to center the map on.
         */
        longitude: {
          type: Number,
          value: -122.41942,
          notify: true,
          reflectToAttribute: true
        },
  
        /**
         * A kml file to load.
         */
        kml: {
          type: String,
          value: null,
          observer: '_loadKml'
        },
  
        /**
         * A zoom level to set the map to.
         */
        zoom: {
          type: Number,
          value: 10,
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          observer: '_zoomChanged',
          notify: true
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        },
  
        /**
         * When set, prevents the map from tilting (when the zoom level and viewport supports it).
         */
        noAutoTilt: {
          type: Boolean,
          value: false
        },
  
        /**
         * Map type to display. One of 'roadmap', 'satellite', 'hybrid', 'terrain'.
         */
        mapType: {
          type: String,
          value: 'roadmap', // roadmap, satellite, hybrid, terrain,
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          observer: '_mapTypeChanged',
          notify: true
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        },
  
        /**
         * Version of the Google Maps API to use.
         */
        version: {
          type: String,
          value: '3.exp'
        },
  
        /**
         * If set, removes the map's default UI controls.
         */
        disableDefaultUi: {
          type: Boolean,
          value: false,
          observer: '_disableDefaultUiChanged'
        },
  
        /**
         * If set, the zoom level is set such that all markers (google-map-marker children) are brought into view.
         */
        fitToMarkers: {
          type: Boolean,
          value: false,
          observer: '_fitToMarkersChanged'
        },
  
        /**
         * If true, prevent the user from zooming the map interactively.
         */
        disableZoom: {
          type: Boolean,
          value: false,
          observer: '_disableZoomChanged'
        },
  
        /**
         * If set, custom styles can be applied to the map.
         * For style documentation see developers.google.com/maps/documentation/javascript/reference#MapTypeStyle
         */
        styles: {
          type: Object,
          value: function() { return {}; }
        },
  
        /**
         * A maximum zoom level which will be displayed on the map.
         */
        maxZoom: {
          type: Number,
          observer: '_maxZoomChanged'
        },
  
        /**
         * A minimum zoom level which will be displayed on the map.
         */
        minZoom: {
          type: Number,
          observer: '_minZoomChanged'
        },
  
        /**
         * If true, sign-in is enabled.
         * See https://developers.google.com/maps/documentation/javascript/signedin#enable_sign_in
         */
        signedIn: {
          type: Boolean,
          value: false
        },
  
        /**
         * The localized language to load the Maps API with. For more information
         * see https://developers.google.com/maps/documentation/javascript/basics#Language
         *
         * Note: the Maps API defaults to the preffered language setting of the browser.
         * Use this parameter to override that behavior.
         */
        language: {
          type: String
        },
  
        /**
         * When true, map *click events are automatically registered.
         */
        clickEvents: {
          type: Boolean,
          value: false,
          observer: '_clickEventsChanged'
        },
  
        /**
         * When true, map drag* events are automatically registered.
         */
        dragEvents: {
          type: Boolean,
          value: false,
          observer: '_dragEventsChanged'
        },
  
        /**
         * When true, map mouse* events are automatically registered.
         */
        mouseEvents: {
          type: Boolean,
          value: false,
          observer: '_mouseEventsChanged'
        },
  
        /**
         * Additional map options for google.maps.Map constructor.
         * Use to specify additional options we do not expose as
         * properties.
         * Ex: `<google-map additional-map-options='{"mapTypeId":"satellite"}'>`
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         *
         * Note, you can't use API enums like `google.maps.ControlPosition.TOP_RIGHT`
         * when using this property as an HTML attribute. Instead, use the actual
         * value (e.g. `3`) or set `.additionalMapOptions` in JS rather than using
         * the attribute.
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         */
        additionalMapOptions: {
          type: Object,
          value: function() { return {}; }
        },
  
        /**
         * The markers on the map.
         */
        markers: {
          type: Array,
          value: function() { return []; },
          readOnly: true
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        },
  
        /**
         * The non-marker objects on the map.
         */
        objects: {
          type: Array,
          value: function() { return []; },
          readOnly: true
        },
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        /**
         * If set, all other info windows on markers are closed when opening a new one.
         */
        singleInfoWindow: {
          type: Boolean,
          value: false
        }
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      },
  
      behaviors: [
        Polymer.IronResizableBehavior
      ],
  
      listeners: {
        'iron-resize': 'resize'
      },
  
      observers: [
        '_debounceUpdateCenter(latitude, longitude)'
      ],
  
      attached: function() {
        this._initGMap();
      },
  
      detached: function() {
        if (this._mutationObserver) {
          this._mutationObserver.disconnect();
          this._mutationObserver = null;
        }
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        if (this._objectsMutationObserver) {
          this._objectsMutationObserver.disconnect();
          this._objectsMutationObserver = null;
        }
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      },
  
      _initGMap: function() {
        if (this.map) {
          return; // already initialized
        }
        if (this.$.api.libraryLoaded !== true) {
          return; // api not loaded
        }
        if (!this.isAttached) {
          return; // not attached
        }
  
        this.map = new google.maps.Map(this.$.map, this._getMapOptions());
        this._listeners = {};
        this._updateCenter();
        this._loadKml();
        this._updateMarkers();
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        this._updateObjects();
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        this._addMapListeners();
        this.fire('google-map-ready');
      },
  
      _mapApiLoaded: function() {
        this._initGMap();
      },
  
      _getMapOptions: function() {
        var mapOptions = {
          zoom: this.zoom,
          tilt: this.noAutoTilt ? 0 : 45,
          mapTypeId: this.mapType,
          disableDefaultUI: this.disableDefaultUi,
          disableDoubleClickZoom: this.disableZoom,
          scrollwheel: !this.disableZoom,
          styles: this.styles,
          maxZoom: Number(this.maxZoom),
          minZoom: Number(this.minZoom)
        };
  
        // Only override the default if set.
        // We use getAttribute here because the default value of this.draggable = false even when not set.
        if (this.getAttribute('draggable') != null) {
          mapOptions.draggable = this.draggable
        }
        for (var p in this.additionalMapOptions)
          mapOptions[p] = this.additionalMapOptions[p];
  
        return mapOptions;
      },
  
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      _attachChildrenToMap: function(children) {
        if (this.map) {
          for (var i = 0, child; child = children[i]; ++i) {
            child.map = this.map;
          }
        }
      },
  
      // watch for future updates to marker objects
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      _observeMarkers: function() {
        // Watch for future updates.
        if (this._mutationObserver) {
          return;
        }
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        this._mutationObserver = new MutationObserver(this._updateMarkers.bind(this));
        this._mutationObserver.observe(this.$.selector, {
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          childList: true
        });
      },
  
      _updateMarkers: function() {
        var newMarkers = Array.prototype.slice.call(
            Polymer.dom(this.$.markers).getDistributedNodes());
  
        // do not recompute if markers have not been added or removed
        if (newMarkers.length === this.markers.length) {
          var added = newMarkers.filter(function(m) {
            return this.markers && this.markers.indexOf(m) === -1;
          }.bind(this));
          if (added.length === 0) {
            // set up observer first time around
            if (!this._mutationObserver) {
              this._observeMarkers();
            }
            return;
          }
        }
  
        this._observeMarkers();
  
        this.markers = this._setMarkers(newMarkers);
  
        // Set the map on each marker and zoom viewport to ensure they're in view.
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        this._attachChildrenToMap(this.markers);
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        if (this.fitToMarkers) {
          this._fitToMarkersChanged();
        }
      },
  
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      // watch for future updates to non-marker objects
      _observeObjects: function() {
        if (this._objectsMutationObserver) {
          return;
        }
        this._objectsMutationObserver = new MutationObserver(this._updateObjects.bind(this));
        this._objectsMutationObserver.observe(this, {
          childList: true
        });
      },
  
      _updateObjects: function() {
        var newObjects = Array.prototype.slice.call(
            Polymer.dom(this.$.objects).getDistributedNodes());
  
        // Do not recompute if objects have not been added or removed.
        if (newObjects.length === this.objects.length) {
          var added = newObjects.filter(function(o) {
            return this.objects.indexOf(o) === -1;
          }.bind(this));
          if (added.length === 0) {
            // Set up observer first time around.
            this._observeObjects();
            return;
          }
        }
  
        this._observeObjects();
        this._setObjects(newObjects);
        this._attachChildrenToMap(this.objects);
      },
  
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      /**
       * Clears all markers from the map.
       *
       * @method clear
       */
      clear: function() {
        for (var i = 0, m; m = this.markers[i]; ++i) {
          m.marker.setMap(null);
        }
      },
  
      /**
       * Explicitly resizes the map, updating its center. This is useful if the
       * map does not show after you have unhidden it.
       *
       * @method resize
       */
      resize: function() {
        if (this.map) {
  
          // saves and restores latitude/longitude because resize can move the center
          var oldLatitude = this.latitude;
          var oldLongitude = this.longitude;
          google.maps.event.trigger(this.map, 'resize');
          this.latitude = oldLatitude;  // restore because resize can move our center
          this.longitude = oldLongitude;
  
          if (this.fitToMarkers) { // we might not have a center if we are doing fit-to-markers
            this._fitToMarkersChanged();
          }
        }
      },
  
      _loadKml: function() {
        if (this.kml) {
          var kmlfile = new google.maps.KmlLayer({
            url: this.kml,
            map: this.map
          });
        }
      },
  
      _debounceUpdateCenter: function() {
        this.debounce('updateCenter', this._updateCenter);
      },
  
      _updateCenter: function() {
        this.cancelDebouncer('updateCenter');
  
        if (this.map && this.latitude !== undefined && this.longitude !== undefined) {
          // allow for latitude and longitude to be String-typed, but still Number valued
          var lati = Number(this.latitude);
          if (isNaN(lati)) {
            throw new TypeError('latitude must be a number');
          }
          var longi = Number(this.longitude);
          if (isNaN(longi)) {
            throw new TypeError('longitude must be a number');
          }
  
          var newCenter = new google.maps.LatLng(lati, longi);
          var oldCenter = this.map.getCenter();
  
          if (!oldCenter) {
            // If the map does not have a center, set it right away.
            this.map.setCenter(newCenter);
          } else {
            // Using google.maps.LatLng returns corrected lat/lngs.
            oldCenter = new google.maps.LatLng(oldCenter.lat(), oldCenter.lng());
  
            // If the map currently has a center, slowly pan to the new one.
            if (!oldCenter.equals(newCenter)) {
              this.map.panTo(newCenter);
            }
          }
        }
      },
  
      _zoomChanged: function() {
        if (this.map) {
          this.map.setZoom(Number(this.zoom));
        }
      },
  
      _clickEventsChanged: function() {
        if (this.map) {
          if (this.clickEvents) {
            this._forwardEvent('click');
            this._forwardEvent('dblclick');
            this._forwardEvent('rightclick');
          } else {
            this._clearListener('click');
            this._clearListener('dblclick');
            this._clearListener('rightclick');
          }
        }
      },
  
      _dragEventsChanged: function() {
        if (this.map) {
          if (this.dragEvents) {
            this._forwardEvent('drag');
            this._forwardEvent('dragend');
            this._forwardEvent('dragstart');
          } else {
            this._clearListener('drag');
            this._clearListener('dragend');
            this._clearListener('dragstart');
          }
        }
      },
  
      _mouseEventsChanged: function() {
        if (this.map) {
          if (this.mouseEvents) {
            this._forwardEvent('mousemove');
            this._forwardEvent('mouseout');
            this._forwardEvent('mouseover');
          } else {
            this._clearListener('mousemove');
            this._clearListener('mouseout');
            this._clearListener('mouseover');
          }
        }
      },
  
      _maxZoomChanged: function() {
        if (this.map) {
          this.map.setOptions({maxZoom: Number(this.maxZoom)});
        }
      },
  
      _minZoomChanged: function() {
        if (this.map) {
          this.map.setOptions({minZoom: Number(this.minZoom)});
        }
      },
  
      _mapTypeChanged: function() {
        if (this.map) {
          this.map.setMapTypeId(this.mapType);
        }
      },
  
      _disableDefaultUiChanged: function() {
        if (!this.map) {
          return;
        }
        this.map.setOptions({disableDefaultUI: this.disableDefaultUi});
      },
  
      _disableZoomChanged: function() {
        if (!this.map) {
          return;
        }
        this.map.setOptions({
          disableDoubleClickZoom: this.disableZoom,
          scrollwheel: !this.disableZoom
        });
      },
  
      attributeChanged: function(attrName, oldVal, newVal) {
        if (!this.map) {
          return;
        }
        // Cannot use *Changed watchers for native properties.
        switch (attrName) {
          case 'draggable':
            this.map.setOptions({draggable: this.draggable});
            break;
        }
      },
  
      _fitToMarkersChanged: function() {
        // TODO(ericbidelman): respect user's zoom level.
  
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        if (this.map && this.fitToMarkers && this.markers.length > 0) {
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          var latLngBounds = new google.maps.LatLngBounds();
          for (var i = 0, m; m = this.markers[i]; ++i) {
            latLngBounds.extend(
                new google.maps.LatLng(m.latitude, m.longitude));
          }
  
          // For one marker, don't alter zoom, just center it.
          if (this.markers.length > 1) {
            this.map.fitBounds(latLngBounds);
          }
  
          this.map.setCenter(latLngBounds.getCenter());
        }
      },
  
      _addMapListeners: function() {
        google.maps.event.addListener(this.map, 'center_changed', function() {
          var center = this.map.getCenter();
          this.latitude = center.lat();
          this.longitude = center.lng();
        }.bind(this));
  
        google.maps.event.addListener(this.map, 'zoom_changed', function() {
          this.zoom = this.map.getZoom();
        }.bind(this));
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        google.maps.event.addListener(this.map, 'maptypeid_changed', function() {
          this.mapType = this.map.getMapTypeId();
        }.bind(this));
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        this._clickEventsChanged();
        this._dragEventsChanged();
        this._mouseEventsChanged();
      },
  
      _clearListener: function(name) {
        if (this._listeners[name]) {
          google.maps.event.removeListener(this._listeners[name]);
          this._listeners[name] = null;
        }
      },
  
      _forwardEvent: function(name) {
        this._listeners[name] = google.maps.event.addListener(this.map, name, function(event) {
          this.fire('google-map-' + name, event);
        }.bind(this));
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      },
  
     _deselectMarker: function(e, detail) {
       // If singleInfoWindow is set, update iron-selector's selected attribute to be null.
       // Else remove the marker from iron-selector's selected array.
       var markerIndex = this.$.selector.indexOf(e.target);
  
       if (this.singleInfoWindow) {
        this.$.selector.selected = null;
       } else if (this.$.selector.selectedValues) {
        this.$.selector.selectedValues = this.$.selector.selectedValues.filter(function(i) {return i !== markerIndex});
       }
     }
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    });
  
  </script>