From 62461bc1d2bbf682685c4504d5028fc4f6843884 Mon Sep 17 00:00:00 2001
From: Trevor Blades <tdblades@gmail.com>
Date: Tue, 3 Oct 2017 13:05:59 -0700
Subject: [PATCH] Enable mouse wheel in freehand draw mode

Previously, events weren't being propagated if the active draw
interaction had its `freehand` property set to true. This means that
you can't use your mouse wheel to zoom the map in freehand mode.

This change sets the default `pass` value to true and adds additional
logic to determine when it should be set to false (and stop event
propagation).
---
 src/ol/interaction/draw.js | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/ol/interaction/draw.js b/src/ol/interaction/draw.js
index e3afab2338..5bb78a54b1 100644
--- a/src/ol/interaction/draw.js
+++ b/src/ol/interaction/draw.js
@@ -309,13 +309,16 @@ ol.interaction.Draw.prototype.setMap = function(map) {
  */
 ol.interaction.Draw.handleEvent = function(event) {
   this.freehand_ = this.mode_ !== ol.interaction.Draw.Mode_.POINT && this.freehandCondition_(event);
-  var pass = !this.freehand_;
+  var pass = true;
   if (this.freehand_ &&
-      event.type === ol.MapBrowserEventType.POINTERDRAG && this.sketchFeature_ !== null) {
+      event.type === ol.MapBrowserEventType.POINTERDRAG &&
+      this.sketchFeature_ !== null) {
     this.addToDrawing_(event);
     pass = false;
-  } else if (event.type ===
-      ol.MapBrowserEventType.POINTERMOVE) {
+  } else if (this.freehand_ &&
+      event.type === ol.MapBrowserEventType.POINTERDOWN) {
+    pass = false;
+  } else if (event.type === ol.MapBrowserEventType.POINTERMOVE) {
     pass = this.handlePointerMove_(event);
   } else if (event.type === ol.MapBrowserEventType.DBLCLICK) {
     pass = false;