From 705555f1f71aec22bcd569acc4f085146406de0c Mon Sep 17 00:00:00 2001
From: euzuro <euzuro@metacarta.com>
Date: Wed, 21 Jun 2006 14:31:34 +0000
Subject: [PATCH] add concept of slideFactor to panzoom

git-svn-id: http://svn.openlayers.org/trunk/openlayers@650 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 lib/OpenLayers/Control/PanZoom.js | 55 ++++++++++++++++---------------
 1 file changed, 28 insertions(+), 27 deletions(-)

diff --git a/lib/OpenLayers/Control/PanZoom.js b/lib/OpenLayers/Control/PanZoom.js
index 234a8ada76..e10b795cf1 100644
--- a/lib/OpenLayers/Control/PanZoom.js
+++ b/lib/OpenLayers/Control/PanZoom.js
@@ -11,6 +11,9 @@ OpenLayers.Control.PanZoom.Y = 4;
 OpenLayers.Control.PanZoom.prototype = 
   Object.extend( new OpenLayers.Control(), {
 
+    /** @type int */
+    slideFactor: 50,
+
     /** @type Array of Button Divs */
     buttons: null,
 
@@ -80,6 +83,7 @@ OpenLayers.Control.PanZoom.prototype =
         btn.onclick  = this.doubleClick.bindAsEventListener(btn);
         btn.action = id;
         btn.map = this.map;
+        btn.slideFactor = this.slideFactor;
 
         //we want to remember/reference the outer div
         this.buttons.push(btn);
@@ -100,43 +104,40 @@ OpenLayers.Control.PanZoom.prototype =
      * @param {event} evt
      */
     buttonDown: function (evt) {
+
+        var slide = this.map.getResolution() * this.slideFactor;
+        var center = this.map.getCenter();
+
+        var newCenter = center.copyOf();
+
         switch (this.action) {
             case "panup": 
-                var resolution = this.map.getResolution();
-                var center = this.map.getCenter();
-                this.map.setCenter(
-                  new OpenLayers.LonLat(center.lon, 
-                                        center.lat + (resolution * 50))
-                                       );
+                newCenter = newCenter.add( 0, slide);
                 break;
             case "pandown": 
-                var resolution = this.map.getResolution();
-                var center = this.map.getCenter();
-                this.map.setCenter(
-                  new OpenLayers.LonLat(center.lon,
-                                        center.lat - (resolution * 50))
-                                       );
+                newCenter = newCenter.add( 0, -slide);
                 break;
             case "panleft": 
-                var resolution = this.map.getResolution();
-                var center = this.map.getCenter();
-                this.map.setCenter(
-                  new OpenLayers.LonLat(center.lon - (resolution * 50), 
-                                        center.lat)
-                                       );
+                newCenter = newCenter.add( -slide, 0);
                 break;
             case "panright": 
-                var resolution = this.map.getResolution();
-                var center = this.map.getCenter();
-                this.map.setCenter(
-                  new OpenLayers.LonLat(center.lon + (resolution * 50),
-                                        center.lat)
-                                       );
+                newCenter = newCenter.add( slide, 0);
+                break;
+            case "zoomin": 
+                this.map.zoomIn(); 
+                break;
+            case "zoomout": 
+                this.map.zoomOut(); 
+                break;
+            case "zoomworld": 
+                this.map.zoomExtent(); 
                 break;
-            case "zoomin": this.map.zoomIn(); break;
-            case "zoomout": this.map.zoomOut(); break;
-            case "zoomworld": this.map.zoomExtent(); break;
         }
+        
+        if (!newCenter.equals(center)) {
+            this.map.setCenter(newCenter);
+        }
+        
         Event.stop(evt);
     },