To have a functioning map with all overlays, set the map.allOverlays property to true. With all overlays, the map derives projection, resolution, and max extent information from the lowest layer in the draw order (map.layers[0]). To change the layer order, use map.setLayerIndex or map.raiseLayer. r=ahocevar,elemoine (closes #2004)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9171 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Map.html

@@ -1205,6 +1205,70 @@
 
         
     }
+    
+    function test_allOverlays(t) {
+        
+        t.plan(9);
+        
+        var map = new OpenLayers.Map({
+            div: "map", allOverlays: true
+        });
+        
+        var a = new OpenLayers.Layer.Vector("a");
+        var b = new OpenLayers.Layer.Image(
+            "b",
+            "http://earthtrends.wri.org/images/maps/4_m_citylights_lg.gif",
+            new OpenLayers.Bounds(-180, -88.759, 180, 88.759),
+            new OpenLayers.Size(580, 288)
+        );
+        var c = new OpenLayers.Layer.WMS(
+            "c",
+            "http://labs.metacarta.com/wms/vmap0",
+            {layers: 'basic'}
+        );
+        var d = new OpenLayers.Layer.Vector("d");
+        
+        map.addLayers([a, b, c, d]);
+
+        var moveCount = 0;
+        a.moveTo = function() {
+            moveCount++;
+            OpenLayers.Layer.Vector.prototype.moveTo.apply(this, arguments);
+        };
+
+        map.zoomToMaxExtent();
+        t.eq(moveCount, 1, "map.moveTo moves the base layer only once");
+        t.eq(map.getCenter().toString(), "lon=0,lat=0", "a map with all overlays can have a center");
+        
+        // a, b, c, d
+        t.eq(map.baseLayer.name, "a", "base layer set to first layer added");
+        
+        map.removeLayer(a);
+        // b, c, d
+        t.eq(map.baseLayer.name, "b", "if base layer is removed, lowest layer becomes base");
+        
+        map.addLayer(a);
+        // b, c, d, a
+        t.eq(map.baseLayer.name, "b", "adding a new layer doesn't change base layer");
+        
+        map.setLayerIndex(c, 1);
+        // b, d, c, a
+        t.eq(map.baseLayer.name, "b", "changing layer order above base doesn't mess with base");
+        
+        map.setLayerIndex(d, 0);
+        // d, b, c, a
+        t.eq(map.baseLayer.name, "d", "changing layer order to 0 sets base layer");
+        
+        map.raiseLayer(d, 1);
+        // b, d, c, a
+        t.eq(map.baseLayer.name, "b", "raising the base layer sets a new base layer");
+        
+        map.raiseLayer(d, -1);
+        t.eq(map.baseLayer.name, "d", "lowering a layer to lowest index sets as base");
+        
+        map.destroy();
+        
+    }
 
   </script>
 </head>