give map::getResolution a fallback from baseLayer to the 1st layer if in allOverlays mode. r=tschaub (closes #2479)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10043 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -1926,6 +1926,11 @@ OpenLayers.Map = OpenLayers.Class({
         var resolution = null;
         if (this.baseLayer != null) {
             resolution = this.baseLayer.getResolution();
+        } else if(this.allOverlays === true && this.layers.length > 0) {
+            // while adding the 1st layer to the map in allOverlays mode,
+            // this.baseLayer is not set yet when we need the resolution
+            // for calculateInRange.
+            resolution = this.layers[0].getResolution();
         }
         return resolution;
     },

tests/Map.html

@@ -1315,7 +1315,7 @@
     
     function test_allOverlays(t) {
         
-        t.plan(17);
+        t.plan(18);
 
         var map = new OpenLayers.Map({
             div: "map", allOverlays: true
@@ -1406,6 +1406,7 @@
         var count = 0;
         var layer = new OpenLayers.Layer(null, {
             visibility: true,
+            maxExtent: new OpenLayers.Bounds(-180, -90, 180, 90),
             setVisibility: function() {
                 ++count;
                 OpenLayers.Layer.prototype.setVisibility.apply(this, arguments);
@@ -1415,6 +1416,7 @@
         map.zoomToMaxExtent();
         
         t.eq(count, 1, "setVisibility called when visibility is true in layer config");
+        t.eq(layer.div.style.display, "", "layer is visible.");
 
         map.destroy();