"Always zoom in/out while drawing the zoom box." Patch from jachym, tested

and example added by vdeparday. r=me. (Closes #1771)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@8977 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/ZoomBox.js

@@ -29,6 +29,12 @@ OpenLayers.Control.ZoomBox = OpenLayers.Class(OpenLayers.Control, {
      */
     out: false,
 
+    /**
+     * Property: alwaysZoom
+     * {Boolean} Always zoom in/out, when box drawed 
+     */
+    alwaysZoom: false,
+
     /**
      * Method: draw
      */    
@@ -66,7 +72,12 @@ OpenLayers.Control.ZoomBox = OpenLayers.Class(OpenLayers.Control, {
                 var ymax = center.lat + (extent.getHeight()/2)*zoomFactor;
                 var bounds = new OpenLayers.Bounds(xmin, ymin, xmax, ymax);
             }
+            // always zoom in/out 
+            var lastZoom = this.map.getZoom(); 
             this.map.zoomToExtent(bounds);
+            if (lastZoom == this.map.getZoom() && this.alwaysZoom == true){ 
+                this.map.zoomTo(lastZoom + (this.out ? -1 : 1)); 
+            }
         } else { // it's a pixel
             if (!this.out) {
                 this.map.setCenter(this.map.getLonLatFromPixel(position),