the grid layer needs to clear its tile loading timeout when it's removed from the map, or moveGriddedTiles can be called with this.map set to null, r=crschmidt (closes #3110)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11482 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Grid.js

@@ -131,6 +131,20 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
         );
     },
 
+    /**
+     * Method: removeMap
+     * Called when the layer is removed from the map.
+     *
+     * Parameters:
+     * map - {<OpenLayers.Map>} The map.
+     */
+    removeMap: function(map) {
+        if(this.timerId != null) {
+            window.clearTimeout(this.timerId);
+            this.timerId = null;
+        }
+    },
+
     /**
      * APIMethod: destroy
      * Deconstruct the layer and clear the grid.

tests/Layer/Grid.html

@@ -593,7 +593,7 @@
 
     function test_Layer_Grid_destroy (t) {
 
-        t.plan( 7 );
+        t.plan( 8 );
 
         var map = new OpenLayers.Map('map');
         layer = new OpenLayers.Layer.Grid(name, url, params);
@@ -608,6 +608,7 @@
         map.addLayer(layer);
 
         map.setCenter(new OpenLayers.LonLat(0,0), 10);
+        map.setCenter(new OpenLayers.LonLat(1,1));
 
          
         //grab a reference to one of the tiles
@@ -616,6 +617,7 @@
 
         layer.destroy();
         t.eq( tile.imgDiv, null, "Tile destroyed" ); 
+        t.eq( layer.timerId, null, "Tile loading timeout cleared");
         
         t.ok( layer.grid == null, "tiles appropriately destroyed")
 

tests/Map.html

@@ -352,6 +352,8 @@
 
         valid = OpenLayers.Map.prototype.isValidZoomLevel.apply(map, [19]);
         t.eq(valid, false, "19 is not a valid zoomLevel when baseLayer has restrictedMinZoom of 1");
+
+        map.destroy();
     }
     
     function test_Map_isValidLonLat(t) {
@@ -977,6 +979,8 @@
         map.addControls(controls2, pixels2);
         t.eq(map.controls.length, 5, "three additional controls were added by map.addControls with a px-array");
         t.eq(map.controls[3].position.toString(), pixels2[1].toString(), "control 'fourthctrl' has position set to given px");
+
+        map.destroy();
     }
 
     function test_Map_getControl(t) {
@@ -1599,6 +1603,8 @@
         t.eq(map.layers.length, 2, "multiple layers added from options");
         t.ok(map.baseLayer, "map has a base layer");
 
+        map.destroy();
+        
     }
     
     function test_center_option(t) {