Layer.Vector.removeMap must deactivate the strategies, r=fredj (closes #1649)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7708 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Strategy.js

@@ -21,6 +21,28 @@ OpenLayers.Strategy = OpenLayers.Class({
      */
     options: null,
 
+    /** 
+     * Property: active 
+     * {Boolean} The control is active.
+     */
+    active: null,
+
+    /**
+     * Property: autoActivate
+     * {Boolean} The creator of the strategy can set autoActivate to false
+     *      to fully control when the protocol is activated and deactivated.
+     *      Defaults to true.
+     */
+    autoActivate: true,
+
+    /**
+     * Property: autoDestroy
+     * {Boolean} The creator of the strategy can set autoDestroy to false
+     *      to fully control when the strategy is destroyed. Defaults to
+     *      true.
+     */
+    autoDestroy: true,
+
     /**
      * Constructor: OpenLayers.Strategy
      * Abstract class for vector strategies.  Create instances of a subclass.
@@ -32,6 +54,8 @@ OpenLayers.Strategy = OpenLayers.Class({
     initialize: function(options) {
         OpenLayers.Util.extend(this, options);
         this.options = options;
+        // set the active property here, so that user cannot override it
+        this.active = false;
     },
     
     /**
@@ -57,16 +81,34 @@ OpenLayers.Strategy = OpenLayers.Class({
     /**
      * Method: activate
      * Activate the strategy.  Register any listeners, do appropriate setup.
+     *
+     * Returns:
+     * {Boolean} True if the strategy was successfully activated or false if
+     *      the strategy was already active.
      */
     activate: function() {
+        if (!this.active) {
+            this.active = true;
+            return true;
+        }
+        return false;
     },
     
     /**
      * Method: deactivate
      * Deactivate the strategy.  Unregister any listeners, do appropriate
      *     tear-down.
+     *
+     * Returns:
+     * {Boolean} True if the strategy was successfully deactivated or false if
+     *      the strategy was already inactive.
      */
     deactivate: function() {
+        if (this.active) {
+            this.active = false;
+            return true;
+        }
+        return false;
     },
    
     CLASS_NAME: "OpenLayers.Strategy"