OSX: Capture 3-finger swipe events in NativeWindow

atom/browser/api/atom_api_window.cc

@@ -243,6 +243,22 @@ void Window::OnWindowScrollTouchEnd() {
   Emit("scroll-touch-end");
 }
 
+void Window::OnWindowSwipeUp() {
+  Emit("swipe-up");
+}
+
+void Window::OnWindowSwipeRight() {
+  Emit("swipe-right");
+}
+
+void Window::OnWindowSwipeDown() {
+  Emit("swipe-down");
+}
+
+void Window::OnWindowSwipeLeft() {
+  Emit("swipe-left");
+}
+
 void Window::OnWindowEnterHtmlFullScreen() {
   Emit("enter-html-full-screen");
 }

atom/browser/api/atom_api_window.h

@@ -69,6 +69,10 @@ class Window : public mate::TrackableObject<Window>,
   void OnWindowMoved() override;
   void OnWindowScrollTouchBegin() override;
   void OnWindowScrollTouchEnd() override;
+  void OnWindowSwipeUp() override;
+  void OnWindowSwipeRight() override;
+  void OnWindowSwipeDown() override;
+  void OnWindowSwipeLeft() override;
   void OnWindowEnterFullScreen() override;
   void OnWindowLeaveFullScreen() override;
   void OnWindowEnterHtmlFullScreen() override;

atom/browser/native_window.cc

@@ -480,6 +480,26 @@ void NativeWindow::NotifyWindowScrollTouchEnd() {
                     OnWindowScrollTouchEnd());
 }
 
+void NativeWindow::NotifyWindowSwipeUp() {
+  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
+                    OnWindowSwipeUp());
+}
+
+void NativeWindow::NotifyWindowSwipeRight() {
+  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
+                    OnWindowSwipeRight());
+}
+
+void NativeWindow::NotifyWindowSwipeDown() {
+  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
+                    OnWindowSwipeDown());
+}
+
+void NativeWindow::NotifyWindowSwipeLeft() {
+  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
+                    OnWindowSwipeLeft());
+}
+
 void NativeWindow::NotifyWindowLeaveFullScreen() {
   FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
                     OnWindowLeaveFullScreen());

atom/browser/native_window.h

@@ -221,6 +221,10 @@ class NativeWindow : public base::SupportsUserData,
   void NotifyWindowMoved();
   void NotifyWindowScrollTouchBegin();
   void NotifyWindowScrollTouchEnd();
+  void NotifyWindowSwipeUp();
+  void NotifyWindowSwipeRight();
+  void NotifyWindowSwipeDown();
+  void NotifyWindowSwipeLeft();
   void NotifyWindowEnterFullScreen();
   void NotifyWindowLeaveFullScreen();
   void NotifyWindowEnterHtmlFullScreen();

atom/browser/native_window_mac.mm

@@ -267,6 +267,18 @@ bool ScopedDisableResize::disable_resize_ = false;
 
 // NSWindow overrides.
 
+- (void)swipeWithEvent:(NSEvent *)event {
+    if (event.deltaY == 1.0) {
+        shell_->NotifyWindowSwipeUp();
+    } else if (event.deltaX == -1.0) {
+        shell_->NotifyWindowSwipeRight();
+    } else if (event.deltaY == -1.0) {
+        shell_->NotifyWindowSwipeDown();
+    } else if (event.deltaX == 1.0) {
+        shell_->NotifyWindowSwipeLeft();
+    }
+}
+
 - (NSRect)constrainFrameRect:(NSRect)frameRect toScreen:(NSScreen*)screen {
   // Resizing is disabled.
   if (ScopedDisableResize::IsResizeDisabled())

atom/browser/native_window_observer.h

@@ -58,6 +58,10 @@ class NativeWindowObserver {
   virtual void OnWindowMoved() {}
   virtual void OnWindowScrollTouchBegin() {}
   virtual void OnWindowScrollTouchEnd() {}
+  virtual void OnWindowSwipeUp() {}
+  virtual void OnWindowSwipeRight() {}
+  virtual void OnWindowSwipeDown() {}
+  virtual void OnWindowSwipeLeft() {}
   virtual void OnWindowEnterFullScreen() {}
   virtual void OnWindowLeaveFullScreen() {}
   virtual void OnWindowEnterHtmlFullScreen() {}

docs/api/browser-window.md

@@ -322,6 +322,22 @@ Emitted when scroll wheel event phase has begun.
 
 Emitted when scroll wheel event phase has ended.
 
+### Event: 'swipe-up' _OS X_
+
+Emitted on 3-finger swipe up.
+
+### Event: 'swipe-right' _OS X_
+
+Emitted on 3-finger swipe right.
+
+### Event: 'swipe-down' _OS X_
+
+Emitted on 3-finger swipe down.
+
+### Event: 'swipe-left' _OS X_
+
+Emitted on 3-finger swipe left.
+
 ## Methods
 
 The `BrowserWindow` object has the following methods: