From 44ba44fc991c8cf10657118ab9ca25ec7a1fe74c Mon Sep 17 00:00:00 2001
From: futpib <futpib@gmail.com>
Date: Wed, 14 Nov 2018 03:01:31 +0300
Subject: [PATCH] A workaround for touch dragging

---
 components/volume-slider/index.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/components/volume-slider/index.js b/components/volume-slider/index.js
index f3b8669..9340f7a 100644
--- a/components/volume-slider/index.js
+++ b/components/volume-slider/index.js
@@ -57,7 +57,7 @@ module.exports = class VolumeSlider extends React.Component {
 
 	handleDragStart() {
 		this._startX = d3.event.x;
-		this._offsetX = d3.event.sourceEvent.offsetX;
+		this._offsetX = d3.event.sourceEvent.offsetX || (this._lastRenderedX / devicePixelRatio);
 		this.setState({
 			draggingX: clamp(this._offsetX * devicePixelRatio),
 		});
@@ -108,6 +108,8 @@ module.exports = class VolumeSlider extends React.Component {
 			((height / 2) + vol2pix(value, maxVolume)) :
 			draggingX;
 
+		this._lastRenderedX = x;
+
 		const baseX = (height / 2) + vol2pix(baseVolume, maxVolume);
 		const normX = (height / 2) + vol2pix(normVolume, maxVolume);