OpenLayers.Layer.Markers - propagate layer's opacity to the markers. Thanks

ahughes for the bug report and crschmidt for review and advices. (Closes #1114)



git-svn-id: http://svn.openlayers.org/trunk/openlayers@5509 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer.js

@@ -29,6 +29,12 @@ OpenLayers.Layer = OpenLayers.Class({
      */
     div: null,
 
+    /**
+     * Property: opacity
+     * {Float} The layer's opacity. Float number between 0.0 and 1.0.
+     */
+    opacity: null,
+
     /** 
      * Constant: EVENT_TYPES
      * {Array(String)} Supported application event types

lib/OpenLayers/Layer/Markers.js

@@ -57,7 +57,22 @@ OpenLayers.Layer.Markers = OpenLayers.Class(OpenLayers.Layer, {
         OpenLayers.Layer.prototype.destroy.apply(this, arguments);
     },
 
-    
+    /**
+     * APIMethod: setOpacity
+     * Sets the opacity for all the markers.
+     * 
+     * Parameter:
+     * opacity - {Float}
+     */
+    setOpacity: function(opacity) {
+        if (opacity != this.opacity) {
+            this.opacity = opacity;
+            for (var i = 0; i < this.markers.length; i++) {
+                this.markers[i].setOpacity(this.opacity);
+            }
+        }
+    },
+
     /** 
      * Method: moveTo
      *
@@ -85,6 +100,11 @@ OpenLayers.Layer.Markers = OpenLayers.Class(OpenLayers.Layer, {
      */
     addMarker: function(marker) {
         this.markers.push(marker);
+
+        if (this.opacity != null) {
+            marker.setOpacity(this.opacity);
+        }
+
         if (this.map && this.map.getExtent()) {
             marker.map = this.map;
             this.drawMarker(marker);