From ff1a7a8acf7534e61036ec6cf2c75b5a79918143 Mon Sep 17 00:00:00 2001
From: Tom Chen <developer@tomchentw.com>
Date: Thu, 23 Oct 2014 20:41:40 +0800
Subject: [PATCH] feat(GoogleMap): hookup event listeners to map instance

---
 client/scripts/index.js |  7 +++-
 src/GoogleMap.js        | 80 +++++++++++++++++++++++++++++++++--------
 2 files changed, 71 insertions(+), 16 deletions(-)

diff --git a/client/scripts/index.js b/client/scripts/index.js
index 71d534cb..26b72b8e 100755
--- a/client/scripts/index.js
+++ b/client/scripts/index.js
@@ -32,9 +32,14 @@ var Body = React.createClass({
     return <div>
       <GoogleMap
         googleMapsApi={this.state.googleMapsApi}
-        mapOptions={this.state.mapOptions}>
+        mapOptions={this.state.mapOptions}
+        onClick={this._handle_map_click}>
       </GoogleMap>
     </div>
+  },
+
+  _handle_map_click () {
+    console.log("_handle_map_click");
   }
 });
 
diff --git a/src/GoogleMap.js b/src/GoogleMap.js
index 07fc9ddd..d45b8102 100644
--- a/src/GoogleMap.js
+++ b/src/GoogleMap.js
@@ -6,6 +6,26 @@ var mapsNullObject = {
 
 };
 
+var EVENT_MAP = {};
+var EVENT_LIST = "bounds_changed center_changed click dblclick drag dragend dragstart heading_changed idle maptypeid_changed mousemove mouseout mouseover projection_changed resize rightclick tilesloaded tilt_changed zoom_changed"
+                  .split(" ")
+                  .map(toEventList, EVENT_MAP);
+
+function toEventList (name) {
+  var eventName = toEventName(name);
+  this[eventName] = name;
+  return eventName;
+}
+
+function toEventName(name) {
+  return `on${ name
+    .replace(/^(.)/, groupToUpperCase)
+    .replace(/_(.)/g, groupToUpperCase) }`;
+}
+
+function groupToUpperCase (match, group) {
+  return group.toUpperCase();
+}
 
 module.exports = React.createClass({
   displayName: "GoogleMap",
@@ -19,42 +39,72 @@ module.exports = React.createClass({
   getInitialState () {
     return {
       googleMapsApi: this.props.googleMapsApi || mapsNullObject,
-      map: null
+      map: null,
+      eventNames: []
     };
   },
 
+  componentWillMount () {
+    this.setState({
+      eventNames: this._collect_event_names(this.props)
+    });
+  },
+
   componentWillReceiveProps (nextProps) {
     var {googleMapsApi} = nextProps;
+    var newState = {};
+
     if (mapsNullObject !== googleMapsApi) {
-      this.setState({
-        googleMapsApi
-      });
+      newState.googleMapsApi = googleMapsApi;
     }
+    newState.eventNames = this._collect_event_names(nextProps);
+    this.setState(newState);
   },
 
   componentDidMount () {
-    this._initGoogleMaps(this.state.googleMapsApi);
+    this._init_google_maps(this.state.googleMapsApi);
   },
 
   componentDidUpdate () {
-    this._initGoogleMaps(this.state.googleMapsApi);
+    this._init_google_maps(this.state.googleMapsApi);
   },
 
-  _initGoogleMaps (googleMapsApi) {
-    if (this.state.map || mapsNullObject === googleMapsApi) { return; }
-    var map = new googleMapsApi.Map(
-      this.refs.mapCanvas.getDOMNode(),
-      this.props.mapOptions
-    );
-    this.setState({
-      map
-    });
+  componentWillUnmount () {
+    var {googleMapsApi, map} = this.state;
+    this._clear_listeners(googleMapsApi, map);
   },
 
   render () {
     return this._render(this.props, this.state);
   },
 
+  _init_google_maps (googleMapsApi) {
+    if (mapsNullObject === googleMapsApi) { return; }
+    var {map, eventNames} = this.state;
+    if (!map) {
+      map = new googleMapsApi.Map(
+        this.refs.mapCanvas.getDOMNode(),
+        this.props.mapOptions
+      );
+      this.setState({ map });
+    }
+    this._clear_listeners(googleMapsApi, map);
+    eventNames.forEach((eventName) => {
+      var name = EVENT_MAP[eventName];
+      googleMapsApi.event.addListener(map, name, this.props[eventName]);
+    });
+  },
+
+  _collect_event_names (props) {
+    return EVENT_LIST.filter((eventName) => {
+      return eventName in props;
+    });
+  },
+
+  _clear_listeners (googleMapsApi, map) {
+    googleMapsApi.event.clearInstanceListeners(map);
+  },
+
   _render (props, state) {
     return <div ref="mapCanvas" style={{width:"100%", height:400}} />;
   }