xdg-activation-v1: new protocol implementation

This implements the new xdg-activation-v1 protocol [1].

[1]: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/50

include/wlr/types/wlr_xdg_activation_v1.h

@@ -0,0 +1,61 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_TYPES_WLR_XDG_ACTIVATION_V1
+#define WLR_TYPES_WLR_XDG_ACTIVATION_V1
+
+#include <wayland-server-core.h>
+
+struct wlr_xdg_activation_token_v1 {
+	struct wlr_xdg_activation_v1 *activation;
+	// The source surface that created the token.
+	struct wlr_surface *surface; // can be NULL
+	struct wlr_seat *seat; // can be NULL
+	// The serial for the input event that created the token.
+	uint32_t serial; // invalid if seat is NULL
+	// The application ID to be activated. This is just a hint.
+	char *app_id; // can be NULL
+	struct wl_list link; // wlr_xdg_activation_v1.tokens
+
+	// private state
+
+	char *token;
+	struct wl_resource *resource; // can be NULL
+
+	struct wl_listener seat_destroy;
+	struct wl_listener surface_destroy;
+};
+
+struct wlr_xdg_activation_v1 {
+
+	struct wl_list tokens; // wlr_xdg_activation_token_v1.link
+
+	struct {
+		struct wl_signal destroy;
+		struct wl_signal request_activate; // wlr_xdg_activation_v1_request_activate_event
+	} events;
+
+	// private state
+
+	struct wl_global *global;
+
+	struct wl_listener display_destroy;
+};
+
+struct wlr_xdg_activation_v1_request_activate_event {
+	struct wlr_xdg_activation_v1 *activation;
+	// The token used to request activation.
+	struct wlr_xdg_activation_token_v1 *token;
+	// The surface requesting for activation.
+	struct wlr_surface *surface;
+};
+
+struct wlr_xdg_activation_v1 *wlr_xdg_activation_v1_create(
+	struct wl_display *display);
+
+#endif