Workspace switch: Follow natural scroll

Author: leolost2605

lib/Gestures/GestureController.vala

@@ -60,6 +60,7 @@ public class Gala.GestureController : Object {
     public double distance { get; construct set; }
     public double overshoot_lower_clamp { get; construct set; default = 0d; }
     public double overshoot_upper_clamp { get; construct set; default = 1d; }
+    public bool follow_natural_scroll { get; set; default = false; }
 
     /**
      * When disabled gesture progress will stay where the gesture ended and not snap to full integers values.
@@ -166,6 +167,12 @@ public class Gala.GestureController : Object {
                 direction_multiplier = -1;
             }
 
+            if (follow_natural_scroll &&
+                !GestureSettings.is_natural_scroll_enabled (gesture.performed_on_device_type)
+            ) {
+                direction_multiplier *= -1;
+            }
+
             if (snap && !Meta.Prefs.get_gnome_animations ()) {
                 recognizing = false;
                 prepare ();

lib/Gestures/GestureSettings.vala

@@ -28,7 +28,7 @@ private class Gala.GestureSettings : Object {
         touchpad_settings = new GLib.Settings ("org.gnome.desktop.peripherals.touchpad");
     }
 
-    public bool is_natural_scroll_enabled (Clutter.InputDeviceType device_type) {
+    public static bool is_natural_scroll_enabled (Clutter.InputDeviceType device_type) {
         return (device_type == Clutter.InputDeviceType.TOUCHSCREEN_DEVICE)
             ? true
             : touchpad_settings.get_boolean ("natural-scroll");

src/Widgets/MultitaskingView/MultitaskingView.vala

@@ -66,7 +66,8 @@ public class Gala.MultitaskingView : ActorTarget, RootTarget, ActivatableCompone
         workspaces = new WorkspaceRow (display);
 
         workspaces_gesture_controller = new GestureController (SWITCH_WORKSPACE, wm, MULTITASKING_VIEW) {
-            overshoot_upper_clamp = 0.1
+            overshoot_upper_clamp = 0.1,
+            follow_natural_scroll = true,
         };
         workspaces_gesture_controller.enable_touchpad (wm.stage);
         workspaces_gesture_controller.enable_scroll (this, HORIZONTAL);