From 9428a94968ea3862c70673d04bac250a5b808ff5 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Thu, 17 Jan 2013 15:37:32 +0100
Subject: [PATCH] Add animated zoom to keyboard zoom interaction

---
 src/ol/interaction/keyboardzoominteraction.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/ol/interaction/keyboardzoominteraction.js b/src/ol/interaction/keyboardzoominteraction.js
index 3075754ca7..9252cc652c 100644
--- a/src/ol/interaction/keyboardzoominteraction.js
+++ b/src/ol/interaction/keyboardzoominteraction.js
@@ -8,6 +8,12 @@ goog.require('ol.View2D');
 goog.require('ol.interaction.Interaction');
 
 
+/**
+ * @define {number} Zoom duration.
+ */
+ol.interaction.KEYBOARD_ZOOM_DURATION = 100;
+
+
 
 /**
  * @constructor
@@ -31,10 +37,11 @@ ol.interaction.KeyboardZoom.prototype.handleMapBrowserEvent =
     if (charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0)) {
       var map = mapBrowserEvent.map;
       var delta = (charCode == '+'.charCodeAt(0)) ? 4 : -4;
+      map.requestRenderFrame();
       // FIXME works for View2D only
       var view = map.getView();
       goog.asserts.assert(view instanceof ol.View2D);
-      view.zoom(map, delta);
+      view.zoom(map, delta, undefined, ol.interaction.KEYBOARD_ZOOM_DURATION);
       keyEvent.preventDefault();
       mapBrowserEvent.preventDefault();
     }