Wayland: added basic touch support

Copy pasted from mako. I could not test.

docs/dunst.5.pod

@@ -516,7 +516,8 @@ automatically lowered to half of the notification height if it exceeds it.
 
 =item B<mouse_left/middle/right_click> (values: [none/do_action/close_current/close_all])
 
-Defines action of mouse click.
+Defines action of mouse click. A touch input in Wayland acts as a mouse left
+click.
 
 =over 4
 

src/input.c

@@ -25,6 +25,10 @@ void input_handle_click(unsigned int button, bool button_down, int mouse_x, int
                 case BTN_RIGHT:
                         acts = settings.mouse_right_click;
                         break;
+                case BTN_TOUCH:
+                        // TODO Add separate action for touch
+                        acts = settings.mouse_left_click;
+                        break;
                 default:
                         LOG_W("Unsupported mouse button: '%d'", button);
                         return;

src/wayland/wl.c

@@ -30,6 +30,8 @@
 #include "../input.h"
 #include "libgwater-wayland.h"
 
+#define MAX_TOUCHPOINTS 10
+
 struct window_wl {
         cairo_surface_t *c_surface;
         cairo_t * c_ctx;
@@ -64,6 +66,13 @@ struct wl_ctx {
                 int32_t x, y;
         } pointer;
 
+	struct {
+		struct wl_touch *wl_touch;
+		struct {
+			int32_t x, y;
+		} pts[MAX_TOUCHPOINTS];
+	} touch;
+
         struct dimensions cur_dim;
 
         int32_t width, height;
@@ -144,7 +153,36 @@ static void destroy_output(struct dunst_output *output) {
         free(output);
 }
 
-// FIXME: Snipped touch handling
+static void touch_handle_motion(void *data, struct wl_touch *wl_touch,
+                uint32_t time, int32_t id,
+                wl_fixed_t surface_x, wl_fixed_t surface_y) {
+        if (id >= MAX_TOUCHPOINTS) {
+                return;
+        }
+        ctx.touch.pts[id].x = wl_fixed_to_int(surface_x);
+        ctx.touch.pts[id].y = wl_fixed_to_int(surface_y);
+}
+
+static void touch_handle_down(void *data, struct wl_touch *wl_touch,
+                uint32_t serial, uint32_t time, struct wl_surface *sfc, int32_t id,
+                wl_fixed_t surface_x, wl_fixed_t surface_y) {
+        if (id >= MAX_TOUCHPOINTS) {
+                return;
+        }
+        ctx.touch.pts[id].x = wl_fixed_to_int(surface_x);
+        ctx.touch.pts[id].y = wl_fixed_to_int(surface_y);
+}
+
+static void touch_handle_up(void *data, struct wl_touch *wl_touch,
+                uint32_t serial, uint32_t time, int32_t id) {
+        if (id >= MAX_TOUCHPOINTS) {
+                return;
+        }
+        input_handle_click(BTN_TOUCH, false,
+                        ctx.touch.pts[id].x, ctx.touch.pts[id].y);
+
+}
+
 static void pointer_handle_motion(void *data, struct wl_pointer *wl_pointer,
                 uint32_t time, wl_fixed_t surface_x, wl_fixed_t surface_y) {
         ctx.pointer.x = wl_fixed_to_int(surface_x);
@@ -165,7 +203,15 @@ static const struct wl_pointer_listener pointer_listener = {
         .axis = noop,
 };
 
-// FIXME snipped touch listener
+static const struct wl_touch_listener touch_listener = {
+        .down = touch_handle_down,
+        .up = touch_handle_up,
+        .motion = touch_handle_motion,
+        .frame = noop,
+        .cancel = noop,
+        .shape = noop,
+        .orientation = noop,
+};
 
 static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
                 uint32_t capabilities) {
@@ -180,6 +226,15 @@ static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
                         &pointer_listener, ctx.seat);
                 LOG_I("Adding pointer");
         }
+        if (ctx.touch.wl_touch != NULL) {
+                wl_touch_release(ctx.touch.wl_touch);
+                ctx.touch.wl_touch = NULL;
+        }
+        if (capabilities & WL_SEAT_CAPABILITY_TOUCH) {
+                ctx.touch.wl_touch = wl_seat_get_touch(wl_seat);
+                wl_touch_add_listener(ctx.touch.wl_touch,
+                        &touch_listener, ctx.seat);
+        }
 }
 
 static const struct wl_seat_listener seat_listener = {