first shot at getting gmaps working in openlayers.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@609 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Google.js

@@ -1,19 +1,142 @@
 // @require: OpenLayers/Layer.js
 
+// load Google map control script
+// this key was generated for: http://openlayers.python-hosting.com/testing/euzuro/
+document.write("<script src='http://maps.google.com/maps?file=api&amp;v=2&amp;key=ABQIAAAAmQ3udCHPQVB_9T_edFZ7YRRRlP-tOiFgaSzksg_0w1dphL9c5BTfdJMKT91b0UJGibNcWEM0Q5-O1w'></script>");
+
+/**
+ * @class
+ */
 OpenLayers.Layer.Google = Class.create();
 OpenLayers.Layer.Google.prototype = Object.extend( new OpenLayers.Layer(), {
-    // gmap stores the Google Map element
+
+    /** @type Boolean */
+    viewPortLayer: true,
+
+    /** @type GMap2 gmap stores the Google Map element */
     gmap:null,
+   
+    /** @type Boolean */
+    dragging:false,
+    
+    /** 
+     * @constructor
+     * 
+     * @param {String} name
+     */
     initialize: function(name) {
         OpenLayers.Layer.prototype.initialize.apply(this, [name]);
-        this.gmap = new GMap2(this.div);
     },
-    moveTo: function() {
-        center = this.map.getCenter();
-        this.gmap.setCenter(
-           new GLatLng(center.lat, center.lon), 
-           this.map.getZoom()
-        );
-    } 
     
+     /** 
+     * @param {OpenLayers.Map} map
+     */
+    setMap:function(map) {
+        OpenLayers.Layer.prototype.setMap.apply(this, arguments);
+
+        // once our layer has been added to the map, we can create the vemap
+        this.map.events.register("addlayer", this, this.loadGMap);
+    },
+
+    /** 
+     * @param {OpenLayers.Bounds} bounds
+     * @param {int} zoomChanged
+     */
+    moveTo:function(bounds,zoomChanged) {
+
+        if ((this.gmap != null) && (!this.dragging)) {
+
+            var olCenter = this.map.getCenter();
+            var gCenter = this.getGMapCenter();
+            
+            var olZoom = this.map.getZoom();
+            var gZoom = this.gmap.getZoom();
+            
+            if ((!olCenter.equals(gCenter)) || ((olZoom +1) != gZoom)) {
+                this.gmap.setCenter(new GLatLng(olCenter.lat, olCenter.lon), 
+                                    olZoom + 1);
+            }
+        }
+    },
+
+    /**
+     * 
+     */
+    loadGMap:function() {
+        // create div and set to same size as map
+        var veDiv = OpenLayers.Util.createDiv(this.name);
+        var sz = this.map.getSize();
+        veDiv.style.width = sz.w;
+        veDiv.style.height = sz.h;
+        this.div.appendChild(veDiv);
+
+        // create GMap, hide nav controls
+        this.gmap = new GMap2(this.div);
+        this.moveTo();
+
+        // catch pans and zooms from GMap
+        GEvent.addListener(this.gmap, 
+                           "moveend", 
+                           this.catchPanZoom.bindAsEventListener(this)); 
+
+
+        // attach to the drag start and end and we<77>ll set a flag so that
+        //  we dont get recursivity. this is because the events fall through
+        //  the gmaps div and into the main layer div
+        GEvent.addListener(this.gmap, 
+                           "dragstart", 
+                           this.dragStart.bindAsEventListener(this)); 
+
+        GEvent.addListener(this.gmap, 
+                           "dragend", 
+                           this.dragEnd.bindAsEventListener(this)); 
+
+    },
+
+    /** 
+     * @private
+     */
+    dragStart: function() {
+        this.dragging = true;
+    },
+    
+    /** 
+     * @private
+     */
+    dragEnd: function() {
+        this.dragging = false;
+    },
+    
+    /**
+     * @private 
+     * 
+     * @param {event} e
+     */
+    catchPanZoom: function(e) { 
+        var olCenter = this.getGMapCenter();
+        var gZoom = this.gmap.getZoom();
+
+        this.map.setCenter(olCenter, gZoom - 1);
+        
+    },
+
+    /**
+     * @private
+     * 
+     * @returns An OpenLayers.LonLat with the center of the gmap, or null if 
+     *           the GMap has not been centered yet
+     * @type OpenLayers.LonLat
+     */
+    getGMapCenter:function() {
+        var olCenter = null;
+        var gCenter = this.gmap.getCenter();
+        if (gCenter != null) {
+            olCenter = new OpenLayers.LonLat(gCenter.lng(), gCenter.lat());
+        }
+        return olCenter;
+    },
+ 
+    
+    /** @final @type String */
+    CLASS_NAME: "OpenLayers.Layer.Google"
 });