[changed] isActive is an instance method

[removed] <Routes onActiveStateChange>

This commit removes ActiveStore (yay!). Instead, <Routes> components
now store their own active state and emit active state change events
to ActiveState descendants that are interested.

modules/components/Link.js

@@ -119,13 +119,13 @@ var Link = React.createClass({
     var params = Link.getParams(nextProps);
 
     this.setState({
-      isActive: Link.isActive(nextProps.to, params, nextProps.query)
+      isActive: this.isActive(nextProps.to, params, nextProps.query)
     });
   },
 
   updateActiveState: function () {
     this.setState({
-      isActive: Link.isActive(this.props.to, Link.getParams(this.props), this.props.query)
+      isActive: this.isActive(this.props.to, Link.getParams(this.props), this.props.query)
     });
   },
 

modules/components/Routes.js

@@ -11,7 +11,7 @@ var DefaultLocation = require('../locations/DefaultLocation');
 var HashLocation = require('../locations/HashLocation');
 var HistoryLocation = require('../locations/HistoryLocation');
 var RefreshLocation = require('../locations/RefreshLocation');
-var ActiveStore = require('../stores/ActiveStore');
+var ActiveDelegate = require('../mixins/ActiveDelegate');
 var PathStore = require('../stores/PathStore');
 var RouteStore = require('../stores/RouteStore');
 
@@ -43,13 +43,6 @@ function defaultAbortedTransitionHandler(transition) {
   }
 }
 
-/**
- * The default handler for active state updates.
- */
-function defaultActiveStateChangeHandler(state) {
-  ActiveStore.updateState(state);
-}
-
 /**
  * The default handler for errors that were thrown asynchronously
  * while transitioning. The default behavior is to re-throw the
@@ -74,9 +67,10 @@ var Routes = React.createClass({
 
   displayName: 'Routes',
 
+  mixins: [ ActiveDelegate ],
+
   propTypes: {
     onAbortedTransition: React.PropTypes.func.isRequired,
-    onActiveStateChange: React.PropTypes.func.isRequired,
     onTransitionError: React.PropTypes.func.isRequired,
     preserveScrollPosition: React.PropTypes.bool,
     location: function (props, propName, componentName) {
@@ -90,7 +84,6 @@ var Routes = React.createClass({
   getDefaultProps: function () {
     return {
       onAbortedTransition: defaultAbortedTransitionHandler,
-      onActiveStateChange: defaultActiveStateChangeHandler,
       onTransitionError: defaultTransitionErrorHandler,
       preserveScrollPosition: false,
       location: DefaultLocation
@@ -182,8 +175,7 @@ var Routes = React.createClass({
       if (transition.isAborted) {
         routes.props.onAbortedTransition(transition);
       } else if (nextState) {
-        routes.setState(nextState);
-        routes.props.onActiveStateChange(nextState);
+        routes.setState(nextState, routes.emitChange);
 
         // TODO: add functional test
         var rootMatch = getRootMatch(nextState.matches);

modules/mixins/ActiveDelegate.js

@@ -0,0 +1,65 @@
+var React = require('react');
+var ChangeEmitter = require('./ChangeEmitter');
+
+function routeIsActive(activeRoutes, routeName) {
+  return activeRoutes.some(function (route) {
+    return route.props.name === routeName;
+  });
+}
+
+function paramsAreActive(activeParams, params) {
+  for (var property in params) {
+    if (activeParams[property] !== String(params[property]))
+      return false;
+  }
+
+  return true;
+}
+
+function queryIsActive(activeQuery, query) {
+  for (var property in query) {
+    if (activeQuery[property] !== String(query[property]))
+      return false;
+  }
+
+  return true;
+}
+
+/**
+ * A mixin for components that store the active state of routes, URL
+ * parameters, and query.
+ */
+var ActiveDelegate = {
+
+  mixins: [ ChangeEmitter ],
+
+  childContextTypes: {
+    activeDelegate: React.PropTypes.any.isRequired
+  },
+
+  getChildContext: function () {
+    return {
+      activeDelegate: this
+    };
+  },
+
+  /**
+   * Returns true if the route with the given name, URL parameters, and
+   * query are all currently active.
+   */
+  isActive: function (routeName, params, query) {
+    var activeRoutes = this.state.activeRoutes || [];
+    var activeParams = this.state.activeParams || {};
+    var activeQuery = this.state.activeQuery || {};
+
+    var isActive = routeIsActive(activeRoutes, routeName) && paramsAreActive(activeParams, params);
+
+    if (query)
+      return isActive && queryIsActive(activeQuery, query);
+
+    return isActive;
+  }
+
+};
+
+module.exports = ActiveDelegate;

modules/mixins/ActiveState.js

@@ -1,14 +1,16 @@
-var ActiveStore = require('../stores/ActiveStore');
+var React = require('react');
+var ActiveDelegate = require('./ActiveDelegate');
 
 /**
  * A mixin for components that need to know about the routes, params,
  * and query that are currently active. Components that use it get two
  * things:
  *
- *   1. An `isActive` static method they can use to check if a route,
- *      params, and query are active.
- *   2. An `updateActiveState` instance method that is called when the
+ *   1. An `updateActiveState` method that is called when the
  *      active state changes.
+ *   2. An `isActive` method they can use to check if a route,
+ *      params, and query are active.
+ *
  *
  * Example:
  *
@@ -24,40 +26,45 @@ var ActiveStore = require('../stores/ActiveStore');
  *   
  *     updateActiveState: function () {
  *       this.setState({
- *         isActive: Tab.isActive(routeName, params, query)
+ *         isActive: this.isActive(routeName, params, query)
  *       })
  *     }
  *   
  *   });
  */
 var ActiveState = {
 
-  statics: {
-
-    /**
-     * Returns true if the route with the given name, URL parameters, and query
-     * are all currently active.
-     */
-    isActive: ActiveStore.isActive
-
+  contextTypes: {
+    activeDelegate: React.PropTypes.any.isRequired
   },
 
-  componentWillMount: function () {
-    ActiveStore.addChangeListener(this.handleActiveStateChange);
+  /**
+   * Returns this component's ActiveDelegate component.
+   */
+  getActiveDelegate: function () {
+    return this.context.activeDelegate;
   },
 
   componentDidMount: function () {
-    if (this.updateActiveState)
-      this.updateActiveState();
+    this.getActiveDelegate().addChangeListener(this.handleActiveStateChange);
+    this.handleActiveStateChange();
   },
 
   componentWillUnmount: function () {
-    ActiveStore.removeChangeListener(this.handleActiveStateChange);
+    this.getActiveDelegate().removeChangeListener(this.handleActiveStateChange);
   },
 
   handleActiveStateChange: function () {
     if (this.isMounted() && typeof this.updateActiveState === 'function')
       this.updateActiveState();
+  },
+
+  /**
+   * Returns true if the route with the given name, URL parameters, and
+   * query are all currently active.
+   */
+  isActive: function (routeName, params, query) {
+    return this.getActiveDelegate().isActive(routeName, params, query);
   }
 
 };

modules/mixins/ChangeEmitter.js

@@ -0,0 +1,50 @@
+var React = require('react');
+var EventEmitter = require('events').EventEmitter;
+
+var CHANGE_EVENT = 'change';
+
+/**
+ * A mixin for components that emit change events. ActiveDelegate uses
+ * this mixin to notify descendant ActiveState components when the
+ * active state changes.
+ */
+var ChangeEmitter = {
+
+  propTypes: {
+    maxChangeListeners: React.PropTypes.number.isRequired
+  },
+
+  getDefaultProps: function () {
+    return {
+      maxChangeListeners: 0
+    };
+  },
+
+  componentWillMount: function () {
+    this._events = new EventEmitter;
+    this._events.setMaxListeners(this.props.maxChangeListeners);
+  },
+
+  componentWillReceiveProps: function (nextProps) {
+    this._events.setMaxListeners(nextProps.maxChangeListeners);
+  },
+
+  componentWillUnmount: function () {
+    this._events.removeAllListeners();
+  },
+
+  addChangeListener: function (listener) {
+    this._events.addListener(CHANGE_EVENT, listener);
+  },
+
+  removeChangeListener: function (listener) {
+    this._events.removeListener(CHANGE_EVENT, listener);
+  },
+
+  emitChange: function () {
+    this._events.emit(CHANGE_EVENT);
+  }
+
+};
+
+module.exports = ChangeEmitter;