Handle touch on headerbar (#1550)

...using cursor emulate events.

src/input/touch.c

@@ -1,17 +1,22 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include <wayland-util.h>
 #include <wlr/types/wlr_touch.h>
+#include <linux/input-event-codes.h>
 #include "common/mem.h"
 #include "common/scene-helpers.h"
 #include "idle.h"
 #include "input/touch.h"
 #include "labwc.h"
+#include "config/mousebind.h"
+#include "action.h"
+#include "view.h"
 
 /* Holds layout -> surface offsets to report motion events in relative coords */
 struct touch_point {
 	int32_t touch_id;
 	uint32_t x_offset;
 	uint32_t y_offset;
+	struct wlr_surface *surface;
 	struct wl_list link; /* seat.touch_points */
 };
 
@@ -47,20 +52,26 @@ touch_motion(struct wl_listener *listener, void *data)
 	struct wlr_touch_motion_event *event = data;
 	idle_manager_notify_activity(seat->seat);
 
-	/* Convert coordinates: first [0, 1] => layout, then apply offsets */
-	double lx, ly;
-	wlr_cursor_absolute_to_layout_coords(seat->cursor, &event->touch->base,
-		event->x, event->y, &lx, &ly);
-
 	/* Find existing touch point to determine initial offsets to subtract */
 	struct touch_point *touch_point;
 	wl_list_for_each(touch_point, &seat->touch_points, link) {
 		if (touch_point->touch_id == event->touch_id) {
-			double sx = lx - touch_point->x_offset;
+			if (touch_point->surface) {
-			double sy = ly - touch_point->y_offset;
+				/* Convert coordinates: first [0, 1] => layout */
+				double lx, ly;
+				wlr_cursor_absolute_to_layout_coords(seat->cursor,
+					&event->touch->base, event->x, event->y, &lx, &ly);
 
-			wlr_seat_touch_notify_motion(seat->seat, event->time_msec,
+				/* Apply offsets to get surface coords before reporting event */
-				event->touch_id, sx, sy);
+				double sx = lx - touch_point->x_offset;
+				double sy = ly - touch_point->y_offset;
+
+				wlr_seat_touch_notify_motion(seat->seat, event->time_msec,
+					event->touch_id, sx, sy);
+			} else {
+				cursor_emulate_move_absolute(seat, &event->touch->base,
+					event->x, event->y, event->time_msec);
+			}
 			return;
 		}
 	}
@@ -81,28 +92,43 @@ touch_down(struct wl_listener *listener, void *data)
 	struct wlr_touch_down_event *event = data;
 
 	/* Compute layout => surface offset and save for this touch point */
-	double x_offset, y_offset;
-	struct wlr_surface *surface = touch_get_coords(seat, event->touch,
-			event->x, event->y, &x_offset, &y_offset);
-
 	struct touch_point *touch_point = znew(*touch_point);
+	double x_offset, y_offset;
+	touch_point->surface = touch_get_coords(seat, event->touch,
+			event->x, event->y, &x_offset, &y_offset);
 	touch_point->touch_id = event->touch_id;
 	touch_point->x_offset = x_offset;
 	touch_point->y_offset = y_offset;
 
 	wl_list_insert(&seat->touch_points, &touch_point->link);
 
-	double lx, ly;
+	if (touch_point->surface) {
-	wlr_cursor_absolute_to_layout_coords(seat->cursor, &event->touch->base,
+		/* Convert coordinates: first [0, 1] => layout */
-		event->x, event->y, &lx, &ly);
+		double lx, ly;
+		wlr_cursor_absolute_to_layout_coords(seat->cursor,
+			&event->touch->base, event->x, event->y, &lx, &ly);
 
-	/* Apply offsets to get surface coords before reporting event */
+		/* Apply offsets to get surface coords before reporting event */
-	double sx = lx - x_offset;
+		double sx = lx - x_offset;
-	double sy = ly - y_offset;
+		double sy = ly - y_offset;
 
-	if (surface) {
+		struct view *view = view_from_wlr_surface(touch_point->surface);
-		wlr_seat_touch_notify_down(seat->seat, surface,
+		struct mousebind *mousebind;
+		wl_list_for_each(mousebind, &rc.mousebinds, link) {
+			if (mousebind->mouse_event == MOUSE_ACTION_PRESS
+					&& mousebind->button == BTN_LEFT
+					&& mousebind->context == LAB_SSD_CLIENT) {
+				actions_run(view, seat->server, &mousebind->actions, 0);
+			}
+		}
+
+		wlr_seat_touch_notify_down(seat->seat, touch_point->surface,
 			event->time_msec, event->touch_id, sx, sy);
+	} else {
+		cursor_emulate_move_absolute(seat, &event->touch->base,
+			event->x, event->y, event->time_msec);
+		cursor_emulate_button(seat, BTN_LEFT, WLR_BUTTON_PRESSED,
+			event->time_msec);
 	}
 }
 
@@ -116,13 +142,18 @@ touch_up(struct wl_listener *listener, void *data)
 	struct touch_point *touch_point, *tmp;
 	wl_list_for_each_safe(touch_point, tmp, &seat->touch_points, link) {
 		if (touch_point->touch_id == event->touch_id) {
+			if (touch_point->surface) {
+				wlr_seat_touch_notify_up(seat->seat, event->time_msec,
+					event->touch_id);
+			} else {
+				cursor_emulate_button(seat, BTN_LEFT, WLR_BUTTON_RELEASED,
+					event->time_msec);
+			}
 			wl_list_remove(&touch_point->link);
 			zfree(touch_point);
 			break;
 		}
 	}
-
-	wlr_seat_touch_notify_up(seat->seat, event->time_msec, event->touch_id);
 }
 
 void