From 1d1452da618a41727a1ceb4e120dd5dd4f6e875a Mon Sep 17 00:00:00 2001
From: crschmidt <crschmidt@crschmidt.net>
Date: Mon, 29 May 2006 19:18:29 +0000
Subject: [PATCH]  r439@creusa:  crschmidt | 2006-05-29 13:32:54 -0400  Change
 Layer.js to call a moveTo function after visibility changes: This allows us
 to implement #56. Layer/Grid.js now has code which shows how to have a layer
 which doesn't load when it's not visible: This code will be dependant on the
 layers, so this has to be implemented per class. However, classes like
 markers suffer very little performance cost for drawing, so Layer.Grid is the
 most important place for this improvement.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@458 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 lib/OpenLayers/Layer.js      | 1 +
 lib/OpenLayers/Layer/Grid.js | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/lib/OpenLayers/Layer.js b/lib/OpenLayers/Layer.js
index 70bbacd4d6..2aa119e4ce 100644
--- a/lib/OpenLayers/Layer.js
+++ b/lib/OpenLayers/Layer.js
@@ -58,6 +58,7 @@ OpenLayers.Layer.prototype = {
     */
     setVisibility: function(visible) {
         this.div.style.display = (visible) ? "block" : "none";
+        this.moveTo(this.map.getExtent());
     },
     
     /** @final @type String */
diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index 13b55977ba..60e69de455 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -47,6 +47,12 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
      * @param {OpenLayers.Bounds}
      */
     moveTo:function(bounds,zoomChanged) {
+        if (!this.getVisibility()) {
+            if (zoomChanged) {
+                this.grid = null;
+            }
+            return;
+        }
         if (!this.grid || zoomChanged) {
             this._initTiles();
         } else {