Merge pull request #240 from acrisci/feature/x11-backend-axis

x11-backend: axis events

backend/x11/backend.c

@@ -62,6 +62,20 @@ static bool handle_x11_event(struct wlr_x11_backend *x11, xcb_generic_event_t *e
 	case XCB_BUTTON_PRESS:
 	case XCB_BUTTON_RELEASE: {
 		xcb_button_press_event_t *ev = (xcb_button_press_event_t *)event;
+
+		if (ev->detail == XCB_BUTTON_INDEX_4 ||
+				ev->detail == XCB_BUTTON_INDEX_5) {
+			double delta = (ev->detail == XCB_BUTTON_INDEX_4 ? -15 : 15);
+			struct wlr_event_pointer_axis axis = {
+				.device = &x11->pointer_dev,
+				.time_sec = ev->time / 1000,
+				.time_usec = ev->time * 1000,
+				.source = WLR_AXIS_SOURCE_WHEEL,
+				.orientation = WLR_AXIS_ORIENTATION_VERTICAL,
+				.delta = delta,
+			};
+			wl_signal_emit(&x11->pointer.events.axis, &axis);
+		} else {
 			struct wlr_event_pointer_button button = {
 				.device = &x11->pointer_dev,
 				.time_sec = ev->time / 1000,
@@ -72,6 +86,7 @@ static bool handle_x11_event(struct wlr_x11_backend *x11, xcb_generic_event_t *e
 			};
 
 			wl_signal_emit(&x11->pointer.events.button, &button);
+		}
 		x11->time = ev->time;
 		break;
 	}