Add IsSwipeTrackingFromScrollEventsEnabled in system prefs

atom/browser/api/atom_api_system_preferences.cc

@@ -58,6 +58,8 @@ void SystemPreferences::BuildPrototype(
       .SetMethod("unsubscribeLocalNotification",
                  &SystemPreferences::UnsubscribeLocalNotification)
       .SetMethod("getUserDefault", &SystemPreferences::GetUserDefault)
+      .SetMethod("isSwipeTrackingFromScrollEventsEnabled",
+                 &SystemPreferences::IsSwipeTrackingFromScrollEventsEnabled)
 #endif
       .SetMethod("isDarkMode", &SystemPreferences::IsDarkMode);
 }

atom/browser/api/atom_api_system_preferences.h

@@ -40,6 +40,10 @@ class SystemPreferences : public mate::EventEmitter<SystemPreferences> {
   void UnsubscribeLocalNotification(int request_id);
   v8::Local<v8::Value> GetUserDefault(const std::string& name,
                                       const std::string& type);
+  // On 10.7+, back and forward swipe gestures can be triggered using a scroll
+  // gesture, if enabled in System Preferences. This function returns true if
+  // the feature is supported and enabled, and false otherwise.
+  bool IsSwipeTrackingFromScrollEventsEnabled();
 #endif
   bool IsDarkMode();
 

atom/browser/api/atom_api_system_preferences_mac.mm

@@ -11,6 +11,7 @@
 #include "atom/browser/mac/dict_util.h"
 #include "atom/common/native_mate_converters/value_converter.h"
 #include "atom/common/native_mate_converters/gurl_converter.h"
+#import "base/mac/sdk_forward_declarations.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/values.h"
 #include "net/base/mac/url_conversions.h"
@@ -122,6 +123,12 @@ bool SystemPreferences::IsDarkMode() {
   return [mode isEqualToString:@"Dark"];
 }
 
+bool SystemPreferences::IsSwipeTrackingFromScrollEventsEnabled() {
+  SEL selector = @selector(isSwipeTrackingFromScrollEventsEnabled);
+  return [NSEvent respondsToSelector:selector]
+    && [NSEvent performSelector:selector];
+}
+
 }  // namespace api
 
 }  // namespace atom