From 6223342890ba36096e3a9ea9b03a22ec0c3a17e0 Mon Sep 17 00:00:00 2001
From: Anish Athalye <me@anishathalye.com>
Date: Sat, 1 Jul 2017 16:27:49 -0700
Subject: [PATCH 1/2] Add scroll functionality for mobile

---
 src/Viewport.ts | 15 +++++++++++++++
 src/xterm.js    | 12 ++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/Viewport.ts b/src/Viewport.ts
index 82f748ea..6d4c1c84 100644
--- a/src/Viewport.ts
+++ b/src/Viewport.ts
@@ -13,6 +13,7 @@ export class Viewport {
   private currentRowHeight: number;
   private lastRecordedBufferLength: number;
   private lastRecordedViewportHeight: number;
+  private lastTouchY: number;
 
   /**
    * Creates a new Viewport.
@@ -121,4 +122,18 @@ export class Viewport {
     // Prevent the page from scrolling when the terminal scrolls
     ev.preventDefault();
   };
+
+  public onTouchStart(ev: TouchEvent) {
+    this.lastTouchY = ev.touches[0].pageY;
+  };
+
+  public onTouchMove(ev: TouchEvent) {
+    let deltaY = this.lastTouchY - ev.touches[0].pageY;
+    this.lastTouchY = ev.touches[0].pageY;
+    if (deltaY === 0) {
+      return;
+    }
+    this.viewportElement.scrollTop += deltaY;
+    ev.preventDefault();
+  };
 }
diff --git a/src/xterm.js b/src/xterm.js
index a8a76fb9..dc3b940b 100644
--- a/src/xterm.js
+++ b/src/xterm.js
@@ -1095,6 +1095,18 @@ Terminal.prototype.bindMouse = function() {
     self.viewport.onWheel(ev);
     return self.cancel(ev);
   });
+
+  on(el, 'touchstart', function(ev) {
+    if (self.mouseEvents) return;
+    self.viewport.onTouchStart(ev);
+    return self.cancel(ev);
+  });
+
+  on(el, 'touchmove', function(ev) {
+    if (self.mouseEvents) return;
+    self.viewport.onTouchMove(ev);
+    return self.cancel(ev);
+  });
 };
 
 /**

From 3e8ddd19664b505a6ab4c9dd8b7c8e554ccc34b7 Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Mon, 3 Jul 2017 21:43:52 -0700
Subject: [PATCH 2/2] Add jsdoc

---
 src/Viewport.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Viewport.ts b/src/Viewport.ts
index 6d4c1c84..5be6bffd 100644
--- a/src/Viewport.ts
+++ b/src/Viewport.ts
@@ -123,10 +123,18 @@ export class Viewport {
     ev.preventDefault();
   };
 
+  /**
+   * Handles the touchstart event, recording the touch occurred.
+   * @param ev The touch event.
+   */
   public onTouchStart(ev: TouchEvent) {
     this.lastTouchY = ev.touches[0].pageY;
   };
 
+  /**
+   * Handles the touchmove event, scrolling the viewport if the position shifted.
+   * @param ev The touch event.
+   */
   public onTouchMove(ev: TouchEvent) {
     let deltaY = this.lastTouchY - ev.touches[0].pageY;
     this.lastTouchY = ev.touches[0].pageY;