[Timeline] Remain centered during zoom

#936
2016-05-23 15:32:48 -07:00
parent 5b6ea600ba
commit f35947361c
2 changed files with 5 additions and 3 deletions
--- a/platform/features/timeline/src/controllers/TimelineZoomController.js
+++ b/platform/features/timeline/src/controllers/TimelineZoomController.js
@@ -80,11 +80,13 @@ define(
                 * @returns {number} current zoom level (as the size of a
                 *          major tick mark, in pixels)
                 */
-                zoom: function (amount) {
+                zoom: function (amount, bounds) {
                    // Update the zoom level if called with an argument
                    if (arguments.length > 0 && !isNaN(amount)) {
+                        var center = this.toMillis(bounds.x + bounds.width / 2);
                        setZoomLevel(zoomIndex + amount);
                        storeZoom(zoomIndex);
+                        bounds.x = this.toPixels(center) - bounds.width / 2;
                    }
                    return zoomLevels[zoomIndex];
                },