1 files changed, 358 insertions, 0 deletions
diff --git a/examples/foreign-toplevel.c b/examples/foreign-toplevel.c
new file mode 100644
index 00000000..40ddbb09
--- /dev/null
+++ b/examples/foreign-toplevel.c
@@ -0,0 +1,358 @@
+#define _POSIX_C_SOURCE 200809L
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wayland-client.h>
+#include "wlr-foreign-toplevel-management-unstable-v1-client-protocol.h"
+
+/**
+ * Usage:
+ * 1. foreign-toplevel
+ * 	  Prints a list of opened toplevels
+ * 2. foreign-toplevel -f <id>
+ *    Focus the toplevel with the given id
+ * 3. foreign-toplevel -a <id>
+ *    Maximize the toplevel with the given id
+ * 4. foreign-toplevel -u <id>
+ *    Unmaximize the toplevel with the given id
+ * 5. foreign-toplevel -i <id>
+ *    Minimize the toplevel with the given id
+ * 6. foreign-toplevel -r <id>
+ * 	  Restore(unminimize) the toplevel with the given id
+ * 7. foreign-toplevel -c <id>
+ *    Close the toplevel with the given id
+ * 8. foreign-toplevel -m
+ *    Continuously print changes to the list of opened toplevels.
+ *    Can be used together with some of the previous options.
+ */
+
+enum toplevel_state_field {
+	TOPLEVEL_STATE_MAXIMIZED = 1,
+	TOPLEVEL_STATE_MINIMIZED = 2,
+	TOPLEVEL_STATE_ACTIVATED = 4,
+	TOPLEVEL_STATE_INVALID = 8,
+};
+
+struct toplevel_state {
+	char *title;
+	char *app_id;
+
+	uint32_t state;
+};
+
+static void copy_state(struct toplevel_state *current,
+		struct toplevel_state *pending) {
+	if (current->title && pending->title) {
+		free(current->title);
+	}
+	if (current->app_id && pending->app_id) {
+		free(current->app_id);
+	}
+
+	if (pending->title) {
+		current->title = pending->title;
+		pending->title = NULL;
+	}
+	if (pending->app_id) {
+		current->app_id = pending->app_id;
+		pending->app_id = NULL;
+	}
+
+	if (!(pending->state & TOPLEVEL_STATE_INVALID)) {
+		current->state = pending->state;
+	}
+
+	pending->state = TOPLEVEL_STATE_INVALID;
+}
+
+static uint32_t global_id = 0;
+struct toplevel_v1 {
+	struct wl_list link;
+	struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel;
+
+	uint32_t id;
+	struct toplevel_state current, pending;
+};
+
+static void print_toplevel(struct toplevel_v1 *toplevel, bool print_endl) {
+	printf("-> %d. title=%s app_id=%s", toplevel->id,
+			toplevel->current.title ?: "(nil)",
+			toplevel->current.app_id ?: "(nil)");
+
+	if (print_endl) {
+		printf("\n");
+	}
+}
+
+static void print_toplevel_state(struct toplevel_v1 *toplevel, bool print_endl) {
+	if (toplevel->current.state & TOPLEVEL_STATE_MAXIMIZED) {
+		printf(" maximized");
+	} else {
+		printf(" unmaximized");
+	}
+	if (toplevel->current.state & TOPLEVEL_STATE_MINIMIZED) {
+		printf(" minimized");
+	} else {
+		printf(" unminimized");
+	}
+	if (toplevel->current.state & TOPLEVEL_STATE_ACTIVATED) {
+		printf(" active");
+	} else {
+		printf(" inactive");
+	}
+
+	if (print_endl) {
+		printf("\n");
+	}
+}
+
+static void toplevel_handle_title(void *data,
+		struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel,
+		const char *title) {
+	struct toplevel_v1 *toplevel = data;
+	free(toplevel->pending.title);
+	toplevel->pending.title = strdup(title);
+}
+
+static void toplevel_handle_app_id(void *data,
+		struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel,
+		const char *app_id) {
+	struct toplevel_v1 *toplevel = data;
+	free(toplevel->pending.app_id);
+	toplevel->pending.app_id = strdup(app_id);
+}
+
+static void toplevel_handle_output_enter(void *data,
+		struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel,
+		struct wl_output *output) {
+	struct toplevel_v1 *toplevel = data;
+	print_toplevel(toplevel, false);
+	printf(" enter output %u\n",
+		(uint32_t)(size_t)wl_output_get_user_data(output));
+}
+
+static void toplevel_handle_output_leave(void *data,
+		struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel,
+		struct wl_output *output) {
+	struct toplevel_v1 *toplevel = data;
+	print_toplevel(toplevel, false);
+	printf(" leave output %u\n",
+		(uint32_t)(size_t)wl_output_get_user_data(output));
+}
+
+static uint32_t array_to_state(struct wl_array *array) {
+	uint32_t state = 0;
+	uint32_t *entry;
+	wl_array_for_each(entry, array) {
+		if (*entry == ZWLR_FOREIGN_TOPLEVEL_HANDLE_V1_STATE_MAXIMIZED)
+			state |= TOPLEVEL_STATE_MAXIMIZED;
+		if (*entry == ZWLR_FOREIGN_TOPLEVEL_HANDLE_V1_STATE_MINIMIZED)
+			state |= TOPLEVEL_STATE_MINIMIZED;
+		if (*entry == ZWLR_FOREIGN_TOPLEVEL_HANDLE_V1_STATE_ACTIVATED)
+			state |= TOPLEVEL_STATE_ACTIVATED;
+	}
+
+	return state;
+}
+
+static void toplevel_handle_state(void *data,
+		struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel,
+		struct wl_array *state) {
+	struct toplevel_v1 *toplevel = data;
+	toplevel->pending.state = array_to_state(state);
+}
+
+static void toplevel_handle_done(void *data,
+		struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel) {
+	struct toplevel_v1 *toplevel = data;
+	bool state_changed = toplevel->current.state != toplevel->pending.state;
+
+	copy_state(&toplevel->current, &toplevel->pending);
+
+	print_toplevel(toplevel, !state_changed);
+	if (state_changed) {
+		print_toplevel_state(toplevel, true);
+	}
+}
+
+static void toplevel_handle_closed(void *data,
+		struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel) {
+	struct toplevel_v1 *toplevel = data;
+	print_toplevel(toplevel, false);
+	printf(" closed\n");
+
+	zwlr_foreign_toplevel_handle_v1_destroy(zwlr_toplevel);
+}
+
+static const struct zwlr_foreign_toplevel_handle_v1_listener toplevel_impl = {
+	.title = toplevel_handle_title,
+	.app_id = toplevel_handle_app_id,
+	.output_enter = toplevel_handle_output_enter,
+	.output_leave = toplevel_handle_output_leave,
+	.state = toplevel_handle_state,
+	.done = toplevel_handle_done,
+	.closed = toplevel_handle_closed,
+};
+
+static struct zwlr_foreign_toplevel_manager_v1 *toplevel_manager = NULL;
+static struct wl_list toplevel_list;
+
+static void toplevel_manager_handle_toplevel(void *data,
+		struct zwlr_foreign_toplevel_manager_v1 *toplevel_manager,
+		struct zwlr_foreign_toplevel_handle_v1 *zwlr_toplevel) {
+	struct toplevel_v1 *toplevel = calloc(1, sizeof(struct toplevel_v1));
+	if (!toplevel) {
+		fprintf(stderr, "Failed to allocate memory for toplevel\n");
+		return;
+	}
+
+	toplevel->id = global_id++;
+	toplevel->zwlr_toplevel = zwlr_toplevel;
+	wl_list_insert(&toplevel_list, &toplevel->link);
+
+	zwlr_foreign_toplevel_handle_v1_add_listener(zwlr_toplevel, &toplevel_impl,
+		toplevel);
+}
+
+static void toplevel_manager_handle_finished(void *data,
+		struct zwlr_foreign_toplevel_manager_v1 *toplevel_manager) {
+	zwlr_foreign_toplevel_manager_v1_destroy(toplevel_manager);
+}
+
+static const struct zwlr_foreign_toplevel_manager_v1_listener toplevel_manager_impl = {
+	.toplevel = toplevel_manager_handle_toplevel,
+	.finished = toplevel_manager_handle_finished,
+};
+
+struct wl_seat *seat = NULL;
+static void handle_global(void *data, struct wl_registry *registry,
+		uint32_t name, const char *interface, uint32_t version) {
+	if (strcmp(interface, wl_output_interface.name) == 0) {
+		struct wl_output *output = wl_registry_bind(registry, name,
+				&wl_output_interface, version);
+		wl_output_set_user_data(output, (void*)(size_t)name); // assign some ID to the output
+	} else if (strcmp(interface,
+			zwlr_foreign_toplevel_manager_v1_interface.name) == 0) {
+		toplevel_manager = wl_registry_bind(registry, name,
+				&zwlr_foreign_toplevel_manager_v1_interface, 1);
+
+		wl_list_init(&toplevel_list);
+		zwlr_foreign_toplevel_manager_v1_add_listener(toplevel_manager,
+				&toplevel_manager_impl, NULL);
+	} else if (strcmp(interface, wl_seat_interface.name) == 0 && seat == NULL) {
+		seat = wl_registry_bind(registry, name, &wl_seat_interface, version);
+	}
+}
+
+static void handle_global_remove(void *data, struct wl_registry *registry,
+		uint32_t name) {
+	// who cares
+}
+
+static const struct wl_registry_listener registry_listener = {
+	.global = handle_global,
+	.global_remove = handle_global_remove,
+};
+
+/* return NULL when id == -1
+ * exit if the given ID cannot be found in the list of toplevels */
+static struct toplevel_v1 *toplevel_by_id_or_bail(int32_t id) {
+	if (id == -1) {
+		return NULL;
+	}
+
+	struct toplevel_v1 *toplevel;
+	wl_list_for_each(toplevel, &toplevel_list, link) {
+		if (toplevel->id == (uint32_t)id) {
+			return toplevel;
+		}
+	}
+
+	fprintf(stderr, "No toplevel with the given id: %d\n", id);
+	exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv) {
+	int focus_id = -1, close_id = -1;
+	int maximize_id = -1, unmaximize_id = -1;
+	int minimize_id = -1, restore_id = -1;
+	int one_shot = 1;
+	int c;
+
+	// TODO maybe print usage with -h?
+	while ((c = getopt(argc, argv, "f:a:u:i:r:c:m")) != -1) {
+		switch (c) {
+		case 'f':
+			focus_id = atoi(optarg);
+			break;
+		case 'a':
+			maximize_id = atoi(optarg);
+			break;
+		case 'u':
+			unmaximize_id = atoi(optarg);
+			break;
+		case 'i':
+			minimize_id = atoi(optarg);
+			break;
+		case 'r':
+			restore_id = atoi(optarg);
+			break;
+		case 'c':
+			close_id = atoi(optarg);
+			break;
+		case 'm':
+			one_shot = 0;
+			break;
+		}
+	}
+
+	struct wl_display *display = wl_display_connect(NULL);
+	if (display == NULL) {
+		fprintf(stderr, "Failed to create display\n");
+		return EXIT_FAILURE;
+	}
+
+	struct wl_registry *registry = wl_display_get_registry(display);
+	wl_registry_add_listener(registry, &registry_listener, NULL);
+	wl_display_dispatch(display);
+	wl_display_roundtrip(display);
+
+	if (toplevel_manager == NULL) {
+		fprintf(stderr, "wlr-foreign-toplevel not available\n");
+		return EXIT_FAILURE;
+	}
+	wl_display_roundtrip(display); // load list of toplevels
+	wl_display_roundtrip(display); // load toplevel details
+
+	struct toplevel_v1 *toplevel;
+	if ((toplevel = toplevel_by_id_or_bail(focus_id))) {
+		zwlr_foreign_toplevel_handle_v1_activate(toplevel->zwlr_toplevel, seat);
+	}
+	if ((toplevel = toplevel_by_id_or_bail(maximize_id))) {
+		zwlr_foreign_toplevel_handle_v1_set_maximized(toplevel->zwlr_toplevel);
+	}
+	if ((toplevel = toplevel_by_id_or_bail(unmaximize_id))) {
+		zwlr_foreign_toplevel_handle_v1_unset_maximized(toplevel->zwlr_toplevel);
+	}
+	if ((toplevel = toplevel_by_id_or_bail(minimize_id))) {
+		zwlr_foreign_toplevel_handle_v1_set_minimized(toplevel->zwlr_toplevel);
+	}
+	if ((toplevel = toplevel_by_id_or_bail(restore_id))) {
+		zwlr_foreign_toplevel_handle_v1_unset_minimized(toplevel->zwlr_toplevel);
+	}
+	if ((toplevel = toplevel_by_id_or_bail(close_id))) {
+		zwlr_foreign_toplevel_handle_v1_close(toplevel->zwlr_toplevel);
+	}
+
+	wl_display_flush(display);
+
+	if (one_shot == 0) {
+		while (wl_display_dispatch(display) != -1) {
+			// This space intentionally left blank
+		}
+	}
+
+	return EXIT_SUCCESS;
+}