From 0a96e9c17b4f946f9e6c716518825a6d22593efa Mon Sep 17 00:00:00 2001
From: Tim Schaub <tim.schaub@gmail.com>
Date: Wed, 20 Feb 2008 23:39:46 +0000
Subject: [PATCH] Adding a preaddlayer event for maps.  This is triggered
 before a layer is added.  r=me (closes #1220)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6329 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 lib/OpenLayers/Map.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index b41aea3db8..2b83662c8a 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -46,6 +46,9 @@ OpenLayers.Map = OpenLayers.Class({
      *  - other properties that come with browser events
      *
      * Supported map event types:
+     *  - *preaddlayer* triggered before a layer has been added.  The event
+     *      object will include a *layer* property that references the layer  
+     *      to be added.
      *  - *addlayer* triggered after a layer has been added.  The event object
      *      will include a *layer* property that references the added layer.
      *  - *removelayer* triggered after a layer has been removed.  The event
@@ -74,8 +77,8 @@ OpenLayers.Map = OpenLayers.Class({
      *  - *changebaselayer* triggered after the base layer changes
      */
     EVENT_TYPES: [ 
-        "addlayer", "removelayer", "changelayer", "movestart", "move", 
-        "moveend", "zoomend", "popupopen", "popupclose",
+        "preaddlayer", "addlayer", "removelayer", "changelayer", "movestart",
+        "move", "moveend", "zoomend", "popupopen", "popupclose",
         "addmarker", "removemarker", "clearmarkers", "mouseover",
         "mouseout", "mousemove", "dragstart", "drag", "dragend",
         "changebaselayer"],
@@ -732,6 +735,8 @@ OpenLayers.Map = OpenLayers.Class({
                 return false;
             }
         }    
+
+        this.events.triggerEvent("preaddlayer", {layer: layer});
         
         layer.div.className = "olLayerDiv";
         layer.div.style.overflow = "";