Merge pull request #262 from acrisci/feature/data-device-selection

wlr-data-device

include/rootston/input.h

@@ -64,6 +64,17 @@ struct roots_input_event {
 	struct wlr_input_device *device;
 };
 
+struct roots_drag_icon {
+	struct wlr_surface *surface;
+	struct wl_list link; // roots_input::drag_icons
+
+	int32_t sx;
+	int32_t sy;
+
+	struct wl_listener surface_destroy;
+	struct wl_listener surface_commit;
+};
+
 struct roots_touch_point {
 	struct roots_touch *device;
 	int32_t slot;
@@ -80,6 +91,7 @@ struct roots_input {
 	struct wlr_xcursor_theme *theme;
 	struct wlr_xcursor *xcursor;
 	struct wlr_seat *wl_seat;
+	struct wl_list drag_icons;
 	struct wl_client *cursor_client;
 
 	enum roots_cursor_mode mode;
@@ -113,6 +125,7 @@ struct roots_input {
 	struct wl_listener cursor_tool_axis;
 	struct wl_listener cursor_tool_tip;
 
+	struct wl_listener pointer_grab_begin;
 	struct wl_list touch_points;
 
 	struct wl_listener pointer_grab_end;

include/rootston/server.h

@@ -3,7 +3,7 @@
 #include <wayland-server.h>
 #include <wlr/backend.h>
 #include <wlr/backend/session.h>
-#include <wlr/types/wlr_data_device_manager.h>
+#include <wlr/types/wlr_data_device.h>
 #include <wlr/render.h>
 #ifdef HAS_XWAYLAND
 #include <wlr/xwayland.h>

include/wlr/interfaces/wlr_data_source.h

@@ -1,16 +0,0 @@
-#ifndef WLR_INTERFACES_WLR_DATA_SOURCE_H
-#define WLR_INTERFACES_WLR_DATA_SOURCE_H
-
-#include <wlr/types/wlr_data_source.h>
-
-struct wlr_data_source_impl {
-	void (*send)(struct wlr_data_source *data_source, const char *type, int fd);
-	void (*accepted)(struct wlr_data_source *data_source, const char *type);
-	void (*cancelled)(struct wlr_data_source *data_source);
-};
-
-bool wlr_data_source_init(struct wlr_data_source *source,
-		struct wlr_data_source_impl *impl);
-void wlr_data_source_finish(struct wlr_data_source *source);
-
-#endif

include/wlr/types/wlr_data_device.h

@@ -0,0 +1,89 @@
+#ifndef WLR_TYPES_WLR_DATA_DEVICE_H
+#define WLR_TYPES_WLR_DATA_DEVICE_H
+
+#include <wayland-server.h>
+#include <wlr/types/wlr_seat.h>
+
+extern const struct
+wlr_pointer_grab_interface wlr_data_device_pointer_drag_interface;
+
+extern const struct
+wlr_keyboard_grab_interface wlr_data_device_keyboard_drag_interface;
+
+struct wlr_data_device_manager {
+	struct wl_global *global;
+};
+
+struct wlr_data_offer {
+	struct wl_resource *resource;
+	struct wlr_data_source *source;
+
+	uint32_t dnd_actions;
+	enum wl_data_device_manager_dnd_action preferred_dnd_action;
+	bool in_ask;
+
+	struct wl_listener source_destroy;
+};
+
+struct wlr_data_source {
+	struct wl_resource *resource;
+	struct wlr_data_offer *offer;
+	struct wlr_seat_handle *seat;
+	struct wl_array mime_types;
+
+	bool accepted;
+
+	// drag and drop
+	enum wl_data_device_manager_dnd_action current_dnd_action;
+	uint32_t dnd_actions;
+	uint32_t compositor_action;
+	bool actions_set;
+
+	void (*accept)(struct wlr_data_source *source, uint32_t serial,
+			const char *mime_type);
+	void (*send)(struct wlr_data_source *source, const char *mime_type,
+			int32_t fd);
+	void (*cancel)(struct wlr_data_source *source);
+
+	struct {
+		struct wl_signal destroy;
+	} events;
+};
+
+struct wlr_drag {
+	struct wlr_seat_pointer_grab pointer_grab;
+	struct wlr_seat_keyboard_grab keyboard_grab;
+
+	struct wlr_seat_handle *handle;
+	struct wlr_seat_handle *focus_handle;
+
+	struct wlr_surface *icon;
+	struct wlr_surface *focus;
+	struct wlr_data_source *source;
+
+	struct wl_listener icon_destroy;
+	struct wl_listener source_destroy;
+	struct wl_listener handle_unbound;
+};
+
+/**
+ * Create a wl data device manager global for this display.
+ */
+struct wlr_data_device_manager *wlr_data_device_manager_create(
+		struct wl_display *display);
+
+/**
+ * Creates a new wl_data_offer if there is a wl_data_source currently set as the
+ * seat selection and sends it to the client for this handle, followed by the
+ * wl_data_device.selection() event.
+ * If there is no current selection, the wl_data_device.selection() event will
+ * carry a NULL wl_data_offer.
+ * If the client does not have a wl_data_device for the seat nothing * will be
+ * done.
+ */
+void wlr_seat_handle_send_selection(struct wlr_seat_handle *handle);
+
+void wlr_seat_set_selection(struct wlr_seat *seat,
+		struct wlr_data_source *source, uint32_t serial);
+
+#endif

include/wlr/types/wlr_data_device_manager.h

@@ -1,26 +0,0 @@
-#ifndef WLR_TYPES_WLR_DATA_DEVICE_MANAGER_H
-#define WLR_TYPES_WLR_DATA_DEVICE_MANAGER_H
-
-#include <wayland-server.h>
-
-struct wlr_data_device_manager {
-	struct wl_global *global;
-};
-
-struct wlr_data_device_manager *wlr_data_device_manager_create(struct wl_display *dpy);
-void wlr_data_device_manager_destroy(struct wlr_data_device_manager *manager);
-
-struct wlr_data_device {
-	struct wlr_seat *seat;
-	struct wlr_data_source *selection;
-	struct wl_listener selection_destroyed;
-
-	struct {
-		struct wl_signal selection_change;
-	} events;
-};
-
-void wlr_data_device_set_selection(struct wlr_data_device *manager,
-		struct wlr_data_source *source);
-
-#endif

include/wlr/types/wlr_data_source.h

@@ -1,32 +0,0 @@
-#ifndef WLR_TYPES_WLR_DATA_SOURCE_H
-#define WLR_TYPES_WLR_DATA_SOURCE_H
-
-#include <wayland-server.h>
-#include <wlr/types/wlr_list.h>
-
-struct wlr_data_source_impl;
-
-struct wlr_data_source {
-	struct wlr_data_source_impl *impl;
-	struct wlr_list *types;
-	void *data;
-
-	struct {
-		struct wl_signal destroy;
-	} events;
-};
-
-void wlr_data_source_send(struct wlr_data_source *src, const char *type, int fd);
-void wlr_data_source_accepted(struct wlr_data_source *src, const char *type);
-void wlr_data_source_cancelled(struct wlr_data_source *src);
-
-struct wlr_wl_data_source {
-	struct wlr_data_source base;
-	struct wl_resource *resource;
-};
-
-struct wlr_wl_data_source *wlr_wl_data_source_create(
-		struct wl_client *client,
-		uint32_t version, uint32_t id);
-
-#endif

include/wlr/types/wlr_seat.h

@@ -75,11 +75,16 @@ struct wlr_seat_pointer_state {
 	struct wlr_seat_handle *focused_handle;
 	struct wlr_surface *focused_surface;
 
-	struct wl_listener surface_destroy;
-	struct wl_listener resource_destroy;
-
 	struct wlr_seat_pointer_grab *grab;
 	struct wlr_seat_pointer_grab *default_grab;
+
+	uint32_t button_count;
+	uint32_t grab_button;
+	uint32_t grab_serial;
+	uint32_t grab_time;
+
+	struct wl_listener surface_destroy;
+	struct wl_listener resource_destroy;
 };
 
 struct wlr_seat_keyboard {
@@ -111,11 +116,16 @@ struct wlr_seat {
 	struct wl_list keyboards;
 	char *name;
 	uint32_t capabilities;
-	struct wlr_data_device *data_device;
+
+	struct wlr_data_device *data_device; // TODO needed?
+	struct wlr_data_source *selection_source;
+	uint32_t selection_serial;
 
 	struct wlr_seat_pointer_state pointer_state;
 	struct wlr_seat_keyboard_state keyboard_state;
 
+	struct wl_listener selection_data_source_destroy;
+
 	struct {
 		struct wl_signal client_bound;
 		struct wl_signal client_unbound;
@@ -127,6 +137,8 @@ struct wlr_seat {
 		struct wl_signal keyboard_grab_end;
 
 		struct wl_signal request_set_cursor;
+
+		struct wl_signal selection;
 	} events;
 
 	void *data;

meson.build

@@ -51,6 +51,7 @@ udev           = dependency('libudev')
 pixman         = dependency('pixman-1')
 xcb            = dependency('xcb')
 xcb_composite  = dependency('xcb-composite')
+xcb_xfixes     = dependency('xcb-xfixes')
 xcb_icccm      = dependency('xcb-icccm', required: false)
 x11_xcb        = dependency('x11-xcb')
 libcap         = dependency('libcap', required: false)

rootston/cursor.c

@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <math.h>
+#include <assert.h>
 #ifdef __linux__
 #include <linux/input-event-codes.h>
 #elif __FreeBSD__
@@ -12,6 +13,7 @@
 #include <wayland-server.h>
 #include <wlr/types/wlr_cursor.h>
 #include <wlr/util/log.h>
+#include <wlr/types/wlr_data_device.h>
 #include "rootston/config.h"
 #include "rootston/input.h"
 #include "rootston/desktop.h"
@@ -355,6 +357,58 @@ static void handle_tool_tip(struct wl_listener *listener, void *data) {
 			(uint32_t)(event->time_usec / 1000), BTN_LEFT, event->state);
 }
 
+static void handle_drag_icon_destroy(struct wl_listener *listener, void *data) {
+	struct roots_drag_icon *drag_icon =
+		wl_container_of(listener, drag_icon, surface_destroy);
+	wl_list_remove(&drag_icon->link);
+	wl_list_remove(&drag_icon->surface_destroy.link);
+	wl_list_remove(&drag_icon->surface_commit.link);
+	free(drag_icon);
+}
+
+static void handle_drag_icon_commit(struct wl_listener *listener, void *data) {
+	struct roots_drag_icon *drag_icon =
+		wl_container_of(listener, drag_icon, surface_commit);
+	// TODO the spec hints at rules that can determine whether the drag icon is
+	// mapped here, but it is not completely clear so we need to test more
+	// toolkits to see how we should interpret the surface state here.
+	drag_icon->sx += drag_icon->surface->current->sx;
+	drag_icon->sy += drag_icon->surface->current->sy;
+}
+
+static void handle_pointer_grab_begin(struct wl_listener *listener,
+		void *data) {
+	struct roots_input *input =
+		wl_container_of(listener, input, pointer_grab_begin);
+	struct wlr_seat_pointer_grab *grab = data;
+
+	if (grab->interface == &wlr_data_device_pointer_drag_interface) {
+		struct wlr_drag *drag = grab->data;
+		if (drag->icon) {
+			struct roots_drag_icon *iter_icon;
+			wl_list_for_each(iter_icon, &input->drag_icons, link) {
+				if (iter_icon->surface == drag->icon) {
+					// already in the list
+					return;
+				}
+			}
+
+			struct roots_drag_icon *drag_icon =
+				calloc(1, sizeof(struct roots_drag_icon));
+			drag_icon->surface = drag->icon;
+			wl_list_insert(&input->drag_icons, &drag_icon->link);
+
+			wl_signal_add(&drag->icon->events.destroy,
+				&drag_icon->surface_destroy);
+			drag_icon->surface_destroy.notify = handle_drag_icon_destroy;
+
+			wl_signal_add(&drag->icon->events.commit,
+				&drag_icon->surface_commit);
+			drag_icon->surface_commit.notify = handle_drag_icon_commit;
+		}
+	}
+}
+
 static void handle_pointer_grab_end(struct wl_listener *listener, void *data) {
 	struct roots_input *input =
 		wl_container_of(listener, input, pointer_grab_end);
@@ -428,6 +482,11 @@ void cursor_initialize(struct roots_input *input) {
 	wl_signal_add(&input->wl_seat->events.pointer_grab_end, &input->pointer_grab_end);
 	input->pointer_grab_end.notify = handle_pointer_grab_end;
 
+	wl_signal_add(&input->wl_seat->events.pointer_grab_begin, &input->pointer_grab_begin);
+	input->pointer_grab_begin.notify = handle_pointer_grab_begin;
+
+	wl_list_init(&input->request_set_cursor.link);
+
 	wl_signal_add(&input->wl_seat->events.request_set_cursor,
 		&input->request_set_cursor);
 	input->request_set_cursor.notify = handle_request_set_cursor;

rootston/input.c

@@ -124,6 +124,8 @@ struct roots_input *input_create(struct roots_server *server,
 	cursor_load_config(config, input->cursor,
 		input, server->desktop);
 
+	wl_list_init(&input->drag_icons);
+
 	return input;
 }
 

rootston/main.c

@@ -20,11 +20,11 @@ int main(int argc, char **argv) {
 	assert(server.backend = wlr_backend_autocreate(server.wl_display));
 
 	assert(server.renderer = wlr_gles2_renderer_create(server.backend));
+	server.data_device_manager =
+		wlr_data_device_manager_create(server.wl_display);
 	wl_display_init_shm(server.wl_display);
 	server.desktop = desktop_create(&server, server.config);
 	server.input = input_create(&server, server.config);
-	server.data_device_manager = wlr_data_device_manager_create(
-			server.wl_display);
 
 	const char *socket = wl_display_add_socket_auto(server.wl_display);
 	if (!socket) {

rootston/output.c

@@ -150,6 +150,15 @@ static void output_frame_notify(struct wl_listener *listener, void *data) {
 		render_view(view, desktop, wlr_output, &now);
 	}
 
+	struct roots_drag_icon *drag_icon = NULL;
+	wl_list_for_each(drag_icon, &server->input->drag_icons, link) {
+		struct wlr_surface *icon = drag_icon->surface;
+		struct wlr_cursor *cursor = server->input->cursor;
+		double icon_x = cursor->x + drag_icon->sx;
+		double icon_y = cursor->y + drag_icon->sy;
+		render_surface(icon, desktop, wlr_output, &now, icon_x, icon_y, 0);
+	}
+
 	wlr_renderer_end(server->renderer);
 	wlr_output_swap_buffers(wlr_output);
 

types/meson.build

@@ -1,11 +1,10 @@
 lib_wlr_types = static_library(
 	'wlr_types',
 	files(
+		'wlr_data_device.c',
 		'wlr_box.c',
 		'wlr_compositor.c',
 		'wlr_cursor.c',
-		'wlr_data_device_manager.c',
-		'wlr_data_source.c',
 		'wlr_gamma_control.c',
 		'wlr_input_device.c',
 		'wlr_keyboard.c',

types/wlr_data_device.c

@@ -0,0 +1,812 @@
+#define _XOPEN_SOURCE 700
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <assert.h>
+#include <unistd.h>
+#include <wayland-server.h>
+#include <wlr/util/log.h>
+#include <wlr/types/wlr_seat.h>
+#include <wlr/types/wlr_data_device.h>
+
+#define ALL_ACTIONS (WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY | \
+		WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE | \
+		WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK)
+
+static uint32_t data_offer_choose_action(struct wlr_data_offer *offer) {
+	uint32_t available_actions, preferred_action = 0;
+	uint32_t source_actions, offer_actions;
+
+	if (wl_resource_get_version(offer->resource) >=
+			WL_DATA_OFFER_ACTION_SINCE_VERSION) {
+		offer_actions = offer->dnd_actions;
+		preferred_action = offer->preferred_dnd_action;
+	} else {
+		offer_actions = WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
+	}
+
+	if (wl_resource_get_version(offer->source->resource) >=
+			WL_DATA_SOURCE_ACTION_SINCE_VERSION) {
+		source_actions = offer->source->dnd_actions;
+	} else {
+		source_actions = WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
+	}
+
+	available_actions = offer_actions & source_actions;
+
+	if (!available_actions) {
+		return WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE;
+	}
+
+	if (offer->source->seat &&
+			offer->source->compositor_action & available_actions) {
+		return offer->source->compositor_action;
+	}
+
+	// If the dest side has a preferred DnD action, use it
+	if ((preferred_action & available_actions) != 0) {
+		return preferred_action;
+	}
+
+	// Use the first found action, in bit order
+	return 1 << (ffs(available_actions) - 1);
+}
+
+static void data_offer_update_action(struct wlr_data_offer *offer) {
+	uint32_t action;
+
+	if (!offer->source) {
+		return;
+	}
+
+	action = data_offer_choose_action(offer);
+
+	if (offer->source->current_dnd_action == action) {
+		return;
+	}
+
+	offer->source->current_dnd_action = action;
+
+	if (offer->in_ask) {
+		return;
+	}
+
+	if (wl_resource_get_version(offer->source->resource) >=
+			WL_DATA_SOURCE_ACTION_SINCE_VERSION) {
+		wl_data_source_send_action(offer->source->resource, action);
+	}
+
+	if (wl_resource_get_version(offer->resource) >=
+			WL_DATA_OFFER_ACTION_SINCE_VERSION) {
+		wl_data_offer_send_action(offer->resource, action);
+	}
+}
+
+static void client_data_source_accept(struct wlr_data_source *source,
+		uint32_t serial, const char *mime_type) {
+	wl_data_source_send_target(source->resource, mime_type);
+}
+
+static void client_data_source_send(struct wlr_data_source *source,
+		const char *mime_type, int32_t fd) {
+	wl_data_source_send_send(source->resource, mime_type, fd);
+	close(fd);
+}
+
+static void client_data_source_cancel(struct wlr_data_source *source) {
+	wl_data_source_send_cancelled(source->resource);
+}
+
+
+static void data_offer_accept(struct wl_client *client,
+		struct wl_resource *resource, uint32_t serial, const char *mime_type) {
+	struct wlr_data_offer *offer = wl_resource_get_user_data(resource);
+
+	if (!offer->source || offer != offer->source->offer) {
+		return;
+	}
+
+	// TODO check that client is currently focused by the input device
+
+	offer->source->accept(offer->source, serial, mime_type);
+	offer->source->accepted = (mime_type != NULL);
+}
+
+static void data_offer_receive(struct wl_client *client,
+		struct wl_resource *resource, const char *mime_type, int32_t fd) {
+	struct wlr_data_offer *offer = wl_resource_get_user_data(resource);
+
+	if (offer->source && offer == offer->source->offer) {
+		offer->source->send(offer->source, mime_type, fd);
+	} else {
+		close(fd);
+	}
+}
+static void data_offer_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static void data_source_notify_finish(struct wlr_data_source *source) {
+	if (!source->actions_set) {
+		return;
+	}
+
+	if (source->offer->in_ask && wl_resource_get_version(source->resource) >=
+			WL_DATA_SOURCE_ACTION_SINCE_VERSION) {
+		wl_data_source_send_action(source->resource,
+			source->current_dnd_action);
+	}
+
+	if (wl_resource_get_version(source->resource) >=
+			WL_DATA_SOURCE_DND_FINISHED_SINCE_VERSION) {
+		wl_data_source_send_dnd_finished(source->resource);
+	}
+
+	source->offer = NULL;
+}
+
+static void data_offer_finish(struct wl_client *client,
+		struct wl_resource *resource) {
+	struct wlr_data_offer *offer = wl_resource_get_user_data(resource);
+
+	if (!offer->source || offer->source->offer != offer) {
+		return;
+	}
+
+	data_source_notify_finish(offer->source);
+}
+
+static void data_offer_set_actions(struct wl_client *client,
+		struct wl_resource *resource, uint32_t dnd_actions,
+		uint32_t preferred_action) {
+	struct wlr_data_offer *offer = wl_resource_get_user_data(resource);
+
+	if (dnd_actions & ~ALL_ACTIONS) {
+		wl_resource_post_error(offer->resource,
+			WL_DATA_OFFER_ERROR_INVALID_ACTION_MASK,
+			"invalid action mask %x", dnd_actions);
+		return;
+	}
+
+	if (preferred_action && (!(preferred_action & dnd_actions) ||
+				__builtin_popcount(preferred_action) > 1)) {
+		wl_resource_post_error(offer->resource,
+			WL_DATA_OFFER_ERROR_INVALID_ACTION,
+			"invalid action %x", preferred_action);
+		return;
+	}
+
+	offer->dnd_actions = dnd_actions;
+	offer->preferred_dnd_action = preferred_action;
+
+	data_offer_update_action(offer);
+}
+
+static void data_offer_resource_destroy(struct wl_resource *resource) {
+	struct wlr_data_offer *offer = wl_resource_get_user_data(resource);
+
+	if (!offer->source) {
+		goto out;
+	}
+
+	wl_list_remove(&offer->source_destroy.link);
+
+	if (offer->source->offer != offer) {
+		goto out;
+	}
+
+	// If the drag destination has version < 3, wl_data_offer.finish
+	// won't be called, so do this here as a safety net, because
+	// we still want the version >=3 drag source to be happy.
+	if (wl_resource_get_version(offer->resource) <
+			WL_DATA_OFFER_ACTION_SINCE_VERSION) {
+		data_source_notify_finish(offer->source);
+	} else if (offer->source->resource &&
+			wl_resource_get_version(offer->source->resource) >=
+			WL_DATA_SOURCE_DND_FINISHED_SINCE_VERSION) {
+		wl_data_source_send_cancelled(offer->source->resource);
+	}
+
+	offer->source->offer = NULL;
+out:
+	free(offer);
+}
+
+static const struct wl_data_offer_interface data_offer_impl = {
+	.accept = data_offer_accept,
+	.receive = data_offer_receive,
+	.destroy = data_offer_destroy,
+	.finish = data_offer_finish,
+	.set_actions = data_offer_set_actions,
+};
+
+static void handle_offer_source_destroyed(struct wl_listener *listener,
+		void *data) {
+	struct wlr_data_offer *offer =
+		wl_container_of(listener, offer, source_destroy);
+
+	offer->source = NULL;
+}
+
+static struct wlr_data_offer *wlr_data_source_send_offer(
+		struct wlr_data_source *source,
+		struct wl_resource *target) {
+	struct wlr_data_offer *offer = calloc(1, sizeof(struct wlr_data_offer));
+
+	offer->resource =
+		wl_resource_create(wl_resource_get_client(target),
+			&wl_data_offer_interface,
+			wl_resource_get_version(target), 0);
+	if (offer->resource == NULL) {
+		free(offer);
+		return NULL;
+	}
+
+	wl_resource_set_implementation(offer->resource, &data_offer_impl, offer,
+		data_offer_resource_destroy);
+
+	offer->source_destroy.notify = handle_offer_source_destroyed;
+	wl_signal_add(&source->events.destroy, &offer->source_destroy);
+
+	wl_data_device_send_data_offer(target, offer->resource);
+	char **p;
+	wl_array_for_each(p, &source->mime_types) {
+		wl_data_offer_send_offer(offer->resource, *p);
+	}
+
+	offer->source = source;
+	source->offer = offer;
+	source->accepted = false;
+
+	return offer;
+}
+
+
+void wlr_seat_handle_send_selection(struct wlr_seat_handle *handle) {
+	if (!handle->data_device) {
+		return;
+	}
+
+	if (handle->wlr_seat->selection_source) {
+		struct wlr_data_offer *offer =
+			wlr_data_source_send_offer(handle->wlr_seat->selection_source,
+				handle->data_device);
+		wl_data_device_send_selection(handle->data_device, offer->resource);
+	} else {
+		wl_data_device_send_selection(handle->data_device, NULL);
+	}
+}
+
+static void seat_handle_selection_data_source_destroy(
+		struct wl_listener *listener, void *data) {
+	struct wlr_seat *seat =
+		wl_container_of(listener, seat, selection_data_source_destroy);
+
+	if (seat->keyboard_state.focused_handle &&
+			seat->keyboard_state.focused_surface &&
+			seat->keyboard_state.focused_handle->data_device) {
+		wl_data_device_send_selection(
+			seat->keyboard_state.focused_handle->data_device, NULL);
+	}
+
+	seat->selection_source = NULL;
+
+	wl_signal_emit(&seat->events.selection, seat);
+}
+
+void wlr_seat_set_selection(struct wlr_seat *seat,
+		struct wlr_data_source *source, uint32_t serial) {
+	if (seat->selection_source &&
+			seat->selection_serial - serial < UINT32_MAX / 2) {
+		return;
+	}
+
+	if (seat->selection_source) {
+		seat->selection_source->cancel(seat->selection_source);
+		seat->selection_source = NULL;
+		wl_list_remove(&seat->selection_data_source_destroy.link);
+	}
+
+	seat->selection_source = source;
+	seat->selection_serial = serial;
+
+	struct wlr_seat_handle *focused_handle =
+		seat->keyboard_state.focused_handle;
+
+	if (focused_handle) {
+		wlr_seat_handle_send_selection(focused_handle);
+	}
+
+	wl_signal_emit(&seat->events.selection, seat);
+
+	if (source) {
+		seat->selection_data_source_destroy.notify =
+			seat_handle_selection_data_source_destroy;
+		wl_signal_add(&source->events.destroy,
+			&seat->selection_data_source_destroy);
+	}
+}
+
+static void data_device_set_selection(struct wl_client *client,
+		struct wl_resource *seat_resource, struct wl_resource *source_resource,
+		uint32_t serial) {
+	if (!source_resource) {
+		return;
+	}
+
+	struct wlr_data_source *source = wl_resource_get_user_data(source_resource);
+	struct wlr_seat_handle *handle = wl_resource_get_user_data(seat_resource);
+
+	// TODO: store serial and check against incoming serial here
+	wlr_seat_set_selection(handle->wlr_seat, source, serial);
+}
+
+static void data_device_release(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static void drag_handle_seat_unbound(struct wl_listener *listener, void *data) {
+	struct wlr_drag *drag = wl_container_of(listener, drag, handle_unbound);
+	struct wlr_seat_handle *unbound_handle = data;
+
+	if (drag->focus_handle == unbound_handle) {
+		drag->focus_handle = NULL;
+		wl_list_remove(&drag->handle_unbound.link);
+	}
+}
+
+static void wlr_drag_set_focus(struct wlr_drag *drag,
+		struct wlr_surface *surface, double sx, double sy) {
+	if (drag->focus == surface) {
+		return;
+	}
+
+	if (drag->focus_handle && drag->focus_handle->data_device) {
+		wl_list_remove(&drag->handle_unbound.link);
+		wl_data_device_send_leave(drag->focus_handle->data_device);
+		drag->focus_handle = NULL;
+		drag->focus = NULL;
+	}
+
+	if (!surface || !surface->resource) {
+		return;
+	}
+
+	if (!drag->source &&
+			wl_resource_get_client(surface->resource) !=
+			wl_resource_get_client(drag->handle->wl_resource)) {
+		return;
+	}
+
+	if (drag->source && drag->source->offer) {
+		// unlink the offer from the source
+		wl_list_remove(&drag->source->offer->source_destroy.link);
+		drag->source->offer->source = NULL;
+		drag->source->offer = NULL;
+	}
+
+	struct wlr_seat_handle *focus_handle =
+		wlr_seat_handle_for_client(drag->handle->wlr_seat,
+			wl_resource_get_client(surface->resource));
+
+	if (!focus_handle || !focus_handle->data_device) {
+		return;
+	}
+
+	struct wl_resource *offer_resource = NULL;
+	if (drag->source) {
+		drag->source->accepted = false;
+		struct wlr_data_offer *offer =
+			wlr_data_source_send_offer(drag->source, focus_handle->data_device);
+		if (offer == NULL) {
+			return;
+		}
+
+		data_offer_update_action(offer);
+
+		if (wl_resource_get_version(offer->resource) >=
+				WL_DATA_OFFER_SOURCE_ACTIONS_SINCE_VERSION) {
+			wl_data_offer_send_source_actions(offer->resource,
+				drag->source->dnd_actions);
+		}
+
+		offer_resource = offer->resource;
+	}
+
+	uint32_t serial = wl_display_next_serial(drag->handle->wlr_seat->display);
+
+	wl_data_device_send_enter(focus_handle->data_device, serial,
+		surface->resource, wl_fixed_from_double(sx),
+		wl_fixed_from_double(sy), offer_resource);
+
+	drag->focus = surface;
+	drag->focus_handle = focus_handle;
+	drag->handle_unbound.notify = drag_handle_seat_unbound;
+	wl_signal_add(&focus_handle->wlr_seat->events.client_unbound,
+		&drag->handle_unbound);
+}
+
+static void wlr_drag_end(struct wlr_drag *drag) {
+	if (drag->icon) {
+		wl_list_remove(&drag->icon_destroy.link);
+	}
+
+	if (drag->source) {
+		wl_list_remove(&drag->source_destroy.link);
+	}
+
+	wlr_drag_set_focus(drag, NULL, 0, 0);
+	wlr_seat_pointer_end_grab(drag->pointer_grab.seat);
+	wlr_seat_keyboard_end_grab(drag->keyboard_grab.seat);
+	free(drag);
+}
+
+static void pointer_drag_enter(struct wlr_seat_pointer_grab *grab,
+		struct wlr_surface *surface, double sx, double sy) {
+	struct wlr_drag *drag = grab->data;
+	wlr_drag_set_focus(drag, surface, sx, sy);
+}
+
+static void pointer_drag_motion(struct wlr_seat_pointer_grab *grab,
+		uint32_t time, double sx, double sy) {
+	struct wlr_drag *drag = grab->data;
+	if (drag->focus && drag->focus_handle && drag->focus_handle->data_device) {
+		wl_data_device_send_motion(drag->focus_handle->data_device, time,
+			wl_fixed_from_double(sx), wl_fixed_from_double(sy));
+	}
+}
+
+static uint32_t pointer_drag_button(struct wlr_seat_pointer_grab *grab,
+		uint32_t time, uint32_t button, uint32_t state) {
+	struct wlr_drag *drag = grab->data;
+
+	if (drag->source &&
+			grab->seat->pointer_state.grab_button == button &&
+			state == WL_POINTER_BUTTON_STATE_RELEASED) {
+		if (drag->focus_handle && drag->focus_handle->data_device &&
+				drag->source->current_dnd_action &&
+				drag->source->accepted) {
+			wl_data_device_send_drop(drag->focus_handle->data_device);
+			if (wl_resource_get_version(drag->source->resource) >=
+					WL_DATA_SOURCE_DND_DROP_PERFORMED_SINCE_VERSION) {
+				wl_data_source_send_dnd_drop_performed(
+						drag->source->resource);
+			}
+
+			drag->source->offer->in_ask =
+				drag->source->current_dnd_action ==
+				WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK;
+		} else if (wl_resource_get_version(drag->source->resource) >=
+				WL_DATA_SOURCE_DND_FINISHED_SINCE_VERSION) {
+			wl_data_source_send_cancelled(drag->source->resource);
+		}
+	}
+
+	if (grab->seat->pointer_state.button_count == 0 &&
+			state == WL_POINTER_BUTTON_STATE_RELEASED) {
+		wlr_drag_end(drag);
+	}
+
+	return 0;
+}
+
+static void pointer_drag_axis(struct wlr_seat_pointer_grab *grab, uint32_t time,
+		enum wlr_axis_orientation orientation, double value) {
+}
+
+static void pointer_drag_cancel(struct wlr_seat_pointer_grab *grab) {
+	struct wlr_drag *drag = grab->data;
+	wlr_drag_end(drag);
+}
+
+const struct
+wlr_pointer_grab_interface wlr_data_device_pointer_drag_interface = {
+	.enter = pointer_drag_enter,
+	.motion = pointer_drag_motion,
+	.button = pointer_drag_button,
+	.axis = pointer_drag_axis,
+	.cancel = pointer_drag_cancel,
+};
+
+static void keyboard_drag_enter(struct wlr_seat_keyboard_grab *grab,
+		struct wlr_surface *surface) {
+	// nothing has keyboard focus during drags
+}
+
+static void keyboard_drag_key(struct wlr_seat_keyboard_grab *grab,
+		uint32_t time, uint32_t key, uint32_t state) {
+	// no keyboard input during drags
+}
+
+static void keyboard_drag_modifiers(struct wlr_seat_keyboard_grab *grab,
+		uint32_t mods_depressed, uint32_t mods_latched,
+		uint32_t mods_locked, uint32_t group) {
+	// TODO change the dnd action based on what modifier is pressed on the
+	// keyboard
+}
+
+static void keyboard_drag_cancel(struct wlr_seat_keyboard_grab *grab) {
+	struct wlr_drag *drag = grab->data;
+	wlr_drag_end(drag);
+}
+
+const struct
+wlr_keyboard_grab_interface wlr_data_device_keyboard_drag_interface = {
+	.enter = keyboard_drag_enter,
+	.key = keyboard_drag_key,
+	.modifiers = keyboard_drag_modifiers,
+	.cancel = keyboard_drag_cancel,
+};
+
+static void drag_handle_icon_destroy(struct wl_listener *listener, void *data) {
+	struct wlr_drag *drag = wl_container_of(listener, drag, icon_destroy);
+	drag->icon = NULL;
+}
+
+static void drag_handle_drag_source_destroy(struct wl_listener *listener,
+		void *data) {
+	struct wlr_drag *drag = wl_container_of(listener, drag, source_destroy);
+	wlr_drag_end(drag);
+}
+
+static bool seat_handle_start_drag(struct wlr_seat_handle *handle,
+		struct wlr_data_source *source, struct wlr_surface *icon) {
+	struct wlr_drag *drag = calloc(1, sizeof(struct wlr_drag));
+	if (drag == NULL) {
+		return false;
+	}
+
+	struct wlr_seat *seat = handle->wlr_seat;
+
+	if (icon) {
+		drag->icon = icon;
+		drag->icon_destroy.notify = drag_handle_icon_destroy;
+		wl_signal_add(&icon->events.destroy, &drag->icon_destroy);
+		drag->icon = icon;
+	}
+
+	if (source) {
+		drag->source_destroy.notify = drag_handle_drag_source_destroy;
+		wl_signal_add(&source->events.destroy, &drag->source_destroy);
+		drag->source = source;
+	}
+
+	drag->handle = handle;
+	drag->pointer_grab.data = drag;
+	drag->pointer_grab.interface = &wlr_data_device_pointer_drag_interface;
+
+	drag->keyboard_grab.data = drag;
+	drag->keyboard_grab.interface = &wlr_data_device_keyboard_drag_interface;
+
+	wlr_seat_pointer_clear_focus(seat);
+
+	wlr_seat_keyboard_start_grab(seat, &drag->keyboard_grab);
+	wlr_seat_pointer_start_grab(seat, &drag->pointer_grab);
+
+	// TODO keyboard grab
+
+	return true;
+}
+
+static void data_device_start_drag(struct wl_client *client,
+		struct wl_resource *handle_resource,
+		struct wl_resource *source_resource,
+		struct wl_resource *origin_resource, struct wl_resource *icon_resource,
+		uint32_t serial) {
+	struct wlr_seat_handle *handle = wl_resource_get_user_data(handle_resource);
+	struct wlr_seat *seat = handle->wlr_seat;
+	struct wlr_surface *origin = wl_resource_get_user_data(origin_resource);
+	struct wlr_data_source *source = NULL;
+	struct wlr_surface *icon = NULL;
+
+	bool is_pointer_grab = seat->pointer_state.button_count == 1 &&
+		seat->pointer_state.grab_serial == serial &&
+		seat->pointer_state.focused_surface &&
+		seat->pointer_state.focused_surface == origin;
+
+	if (!is_pointer_grab) {
+		return;
+	}
+
+	if (source_resource) {
+		source = wl_resource_get_user_data(source_resource);
+	}
+
+	if (icon_resource) {
+		icon = wl_resource_get_user_data(icon_resource);
+	}
+	if (icon) {
+		if (wlr_surface_set_role(icon, "wl_data_device-icon",
+					handle_resource, WL_DATA_DEVICE_ERROR_ROLE) < 0) {
+			return;
+		}
+	}
+
+	// TODO touch grab
+
+	if (!seat_handle_start_drag(handle, source, icon)) {
+		wl_resource_post_no_memory(handle_resource);
+	} else {
+		source->seat = handle;
+	}
+}
+
+static const struct wl_data_device_interface data_device_impl = {
+	.start_drag = data_device_start_drag,
+	.set_selection = data_device_set_selection,
+	.release = data_device_release,
+};
+
+void data_device_manager_get_data_device(struct wl_client *client,
+		struct wl_resource *manager_resource, uint32_t id,
+		struct wl_resource *seat_resource) {
+	struct wlr_seat_handle *handle = wl_resource_get_user_data(seat_resource);
+
+	struct wl_resource *resource =
+		wl_resource_create(client,
+			&wl_data_device_interface,
+			wl_resource_get_version(manager_resource), id);
+	if (resource == NULL) {
+		wl_resource_post_no_memory(manager_resource);
+		return;
+	}
+
+	if (handle->data_device != NULL) {
+		// XXX this is probably a protocol violation, but it simplfies our code
+		// and it's stupid to create several data devices for the same seat.
+		wl_resource_destroy(handle->data_device);
+	}
+
+	handle->data_device = resource;
+
+	wl_resource_set_implementation(resource, &data_device_impl,
+		handle, NULL);
+}
+
+static void data_source_resource_destroy(struct wl_resource *resource) {
+	struct wlr_data_source *source =
+		wl_resource_get_user_data(resource);
+	char **p;
+
+	wl_signal_emit(&source->events.destroy, source);
+
+	wl_array_for_each(p, &source->mime_types) {
+		free(*p);
+	}
+
+	wl_array_release(&source->mime_types);
+
+	free(source);
+}
+
+static void data_source_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static void data_source_set_actions(struct wl_client *client,
+		struct wl_resource *resource, uint32_t dnd_actions) {
+	struct wlr_data_source *source =
+		wl_resource_get_user_data(resource);
+
+	if (source->actions_set) {
+		wl_resource_post_error(source->resource,
+			WL_DATA_SOURCE_ERROR_INVALID_ACTION_MASK,
+			"cannot set actions more than once");
+		return;
+	}
+
+	if (dnd_actions & ~ALL_ACTIONS) {
+		wl_resource_post_error(source->resource,
+			WL_DATA_SOURCE_ERROR_INVALID_ACTION_MASK,
+			"invalid action mask %x", dnd_actions);
+		return;
+	}
+
+	if (source->seat) {
+		wl_resource_post_error(source->resource,
+			WL_DATA_SOURCE_ERROR_INVALID_ACTION_MASK,
+			"invalid action change after "
+			"wl_data_device.start_drag");
+		return;
+	}
+
+	source->dnd_actions = dnd_actions;
+	source->actions_set = true;
+}
+
+static void data_source_offer(struct wl_client *client,
+		struct wl_resource *resource, const char *mime_type) {
+	struct wlr_data_source *source =
+		wl_resource_get_user_data(resource);
+	char **p;
+
+	p = wl_array_add(&source->mime_types, sizeof *p);
+
+	if (p) {
+		*p = strdup(mime_type);
+	}
+	if (!p || !*p){
+		wl_resource_post_no_memory(resource);
+	}
+}
+
+static struct wl_data_source_interface data_source_impl = {
+	.offer = data_source_offer,
+	.destroy = data_source_destroy,
+	.set_actions = data_source_set_actions,
+};
+
+static void data_device_manager_create_data_source(struct wl_client *client,
+		struct wl_resource *resource, uint32_t id) {
+	struct wlr_data_source *source = calloc(1, sizeof(struct wlr_data_source));
+	if (source == NULL) {
+		wl_resource_post_no_memory(resource);
+		return;
+	}
+
+	source->resource =
+		wl_resource_create(client, &wl_data_source_interface,
+			wl_resource_get_version(resource), id);
+	if (source->resource == NULL) {
+		free(source);
+		wl_resource_post_no_memory(resource);
+		return;
+	}
+
+	source->accept = client_data_source_accept;
+	source->send = client_data_source_send;
+	source->cancel = client_data_source_cancel;
+
+	wl_array_init(&source->mime_types);
+	wl_signal_init(&source->events.destroy);
+
+	wl_resource_set_implementation(source->resource, &data_source_impl,
+		source, data_source_resource_destroy);
+}
+
+static const struct wl_data_device_manager_interface
+data_device_manager_impl = {
+	.create_data_source = data_device_manager_create_data_source,
+	.get_data_device = data_device_manager_get_data_device,
+};
+
+static void data_device_manager_bind(struct wl_client *client,
+		void *data, uint32_t version, uint32_t id) {
+	struct wl_resource *resource;
+
+	resource = wl_resource_create(client,
+			&wl_data_device_manager_interface,
+			version, id);
+	if (resource == NULL) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+
+	wl_resource_set_implementation(resource,
+			&data_device_manager_impl, NULL, NULL);
+}
+
+struct wlr_data_device_manager *wlr_data_device_manager_create(
+		struct wl_display *display) {
+	struct wlr_data_device_manager *manager =
+		calloc(1, sizeof(struct wlr_data_device_manager));
+	if (manager == NULL) {
+		wlr_log(L_ERROR, "could not create data device manager");
+		return NULL;
+	}
+
+	manager->global =
+		wl_global_create(display, &wl_data_device_manager_interface,
+			3, NULL, data_device_manager_bind);
+
+	if (!manager->global) {
+		wlr_log(L_ERROR, "could not create data device manager wl global");
+		free(manager);
+		return NULL;
+	}
+
+	return manager;
+}

types/wlr_data_device_manager.c

@@ -1,193 +0,0 @@
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <wayland-server.h>
-#include <wlr/util/log.h>
-#include <wlr/types/wlr_data_device_manager.h>
-#include <wlr/types/wlr_data_source.h>
-#include <wlr/types/wlr_seat.h>
-
-static void resource_destroy(struct wl_client *client,
-		struct wl_resource *resource) {
-	wl_resource_destroy(resource);
-}
-
-static void data_device_start_drag(struct wl_client *client,
-		struct wl_resource *res, struct wl_resource *source_resource,
-		struct wl_resource *origin_res, struct wl_resource *icon_res,
-		uint32_t serial) {
-	wlr_log(L_DEBUG, "TODO: implement data_device:start_drag");
-
-	// Will probably look like this:
-	// struct wlr_seat_handle *handle = wl_resource_get_user_data(res);
-	// struct wlr_data_device *device = handle->wlr_seat->data_device;
-	// struct wlr_data_source *src = wl_resource_get_user_data(src_res);
-	// struct wlr_surface *origin = wl_resource_get_user_data(origin_res);
-	// struct wlr_surface *icon;
-	// if (icon_res)
-	// 	icon = wl_resource_get_user_data(icon_res);
-	// wlr_seat_start_drag(serial, device->seat, src,
-	// 	origin, icon); // will set surface roles and emit signal for user
-}
-
-static void data_device_set_selection(struct wl_client *client,
-		struct wl_resource *resource, struct wl_resource *source_resource,
-		uint32_t serial) {
-	if (!source_resource) {
-		return;
-	}
-
-	// TODO: serial validation
-	struct wlr_seat_handle *handle = wl_resource_get_user_data(resource);
-	struct wlr_data_device *device = handle->wlr_seat->data_device;
-	struct wlr_data_source *source = wl_resource_get_user_data(source_resource);
-	wlr_data_device_set_selection(device, source);
-}
-
-static struct wl_data_device_interface data_device_impl = {
-	.start_drag = data_device_start_drag,
-	.set_selection = data_device_set_selection,
-	.release = resource_destroy
-};
-
-static void data_device_selection_destroy(struct wl_listener *listener,
-		void *data) {
-	struct wlr_data_device *device =
-		wl_container_of(listener, device, selection_destroyed);
-	assert(data == device->selection);
-	device->selection = NULL; // make sure no cancel is sent
-	wlr_data_device_set_selection(device, NULL);
-}
-
-static struct wlr_data_device *seat_ensure_data_device(
-		struct wlr_data_device_manager *manager, struct wlr_seat *seat) {
-	if (seat->data_device) {
-		return seat->data_device;
-	}
-
-	seat->data_device = calloc(1, sizeof(*seat->data_device));
-	if (!seat->data_device) {
-		wlr_log(L_ERROR, "Failed to allocate wlr_data_device");
-		return NULL;
-	}
-
-	seat->data_device->seat = seat;
-	wl_signal_init(&seat->data_device->events.selection_change);
-	seat->data_device->selection_destroyed.notify =
-		data_device_selection_destroy;
-	return seat->data_device;
-}
-
-static void data_device_destroy(struct wl_resource *resource) {
-	struct wlr_seat_handle *handle = wl_resource_get_user_data(resource);
-	handle->data_device = NULL;
-}
-
-static void data_device_manager_create_data_source(struct wl_client *client,
-		struct wl_resource *resource, uint32_t id) {
-	uint32_t version = wl_resource_get_version(resource);
-	if (!wlr_wl_data_source_create(client, version, id)) {
-		wlr_log(L_ERROR, "Failed to create wlr_wl_data_source");
-		wl_resource_post_no_memory(resource);
-		return;
-	}
-}
-
-static void data_device_manager_get_data_device(struct wl_client *client,
-		struct wl_resource *resource, uint32_t id,
-		struct wl_resource *seat_resource) {
-	struct wlr_data_device_manager *manager =
-		wl_resource_get_user_data(resource);
-	struct wlr_seat_handle *seat_handle =
-		wl_resource_get_user_data(seat_resource);
-	struct wlr_data_device *device;
-	if (!(device = seat_ensure_data_device(manager, seat_handle->wlr_seat))) {
-		wl_resource_post_no_memory(resource);
-		return;
-	}
-
-	if (seat_handle->data_device) {
-		// TODO: implement resource lists for seat related handles
-		//   this is a protocol violation, see the todos in wlr_seat.c
-		wl_resource_destroy(seat_handle->data_device);
-	}
-
-	seat_handle->data_device = wl_resource_create(client,
-		&wl_data_device_interface, wl_resource_get_version(resource), id);
-	if (!seat_handle->data_device) {
-		wlr_log(L_ERROR, "Failed to create wl_data_device resource");
-		wl_resource_post_no_memory(resource);
-		return;
-	}
-
-	wl_resource_set_implementation(seat_handle->data_device, &data_device_impl,
-		seat_handle, data_device_destroy);
-}
-
-struct wl_data_device_manager_interface data_device_manager_impl = {
-	.create_data_source = data_device_manager_create_data_source,
-	.get_data_device = data_device_manager_get_data_device
-};
-
-static void data_device_manager_bind(struct wl_client *client, void *data,
-		uint32_t version, uint32_t id) {
-	struct wlr_data_device_manager *manager = data;
-	assert(client && manager);
-
-	struct wl_resource *resource = wl_resource_create(
-			client, &wl_data_device_manager_interface, version, id);
-	if (!resource) {
-		wlr_log(L_ERROR, "Failed to allocate wl_data_device_manager resource");
-		wl_client_post_no_memory(client);
-		return;
-	}
-	wl_resource_set_implementation(resource, &data_device_manager_impl,
-		manager, NULL);
-}
-
-struct wlr_data_device_manager *wlr_data_device_manager_create(
-		struct wl_display *display) {
-	struct wlr_data_device_manager *manager = calloc(1, sizeof(*manager));
-	if (!manager) {
-		wlr_log(L_ERROR, "Failed to allocated wlr_data_device_manager");
-		return NULL;
-	}
-
-	manager->global =
-		wl_global_create(display, &wl_data_device_manager_interface, 3, manager,
-			data_device_manager_bind);
-
-	if (!manager->global) {
-		wlr_log(L_ERROR, "Failed to create global for wlr_data_device_manager");
-		free(manager);
-		return NULL;
-	}
-
-	return manager;
-}
-
-void wlr_data_device_manager_destroy(struct wlr_data_device_manager *manager) {
-	if (manager) {
-		wl_global_destroy(manager->global);
-		free(manager);
-	}
-}
-
-void wlr_data_device_set_selection(struct wlr_data_device *device,
-		struct wlr_data_source *source) {
-	if (device->selection == source) {
-		return;
-	}
-
-	if (device->selection) {
-		wl_list_remove(&device->selection_destroyed.link);
-		wlr_data_source_cancelled(device->selection);
-	}
-
-	device->selection = source;
-	wl_signal_emit(&device->events.selection_change, device);
-
-	if (source) {
-		wl_signal_add(&source->events.destroy, &device->selection_destroyed);
-	}
-}

types/wlr_data_source.c

@@ -1,140 +0,0 @@
-#define _XOPEN_SOURCE 700
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <wayland-server.h>
-#include <wlr/types/wlr_list.h>
-#include <wlr/util/log.h>
-#include <wlr/types/wlr_data_source.h>
-#include <wlr/types/wlr_data_device_manager.h>
-#include <wlr/interfaces/wlr_data_source.h>
-
-bool wlr_data_source_init(struct wlr_data_source *source,
-		struct wlr_data_source_impl *impl) {
-	source->impl = impl;
-	wl_signal_init(&source->events.destroy);
-	return (source->types = wlr_list_create());
-}
-
-void wlr_data_source_finish(struct wlr_data_source *source) {
-	if (source) {
-		wl_signal_emit(&source->events.destroy, source);
-		if (source->types) {
-			wlr_list_foreach(source->types, free);
-		}
-		wlr_list_free(source->types);
-	}
-}
-
-void wlr_data_source_send(struct wlr_data_source *src, const char *type,
-		int fd) {
-	assert(src && src->impl && src->impl->send);
-	src->impl->send(src, type, fd);
-}
-
-void wlr_data_source_accepted(struct wlr_data_source *src, const char *type) {
-	assert(src && src->impl);
-	if (src->impl->accepted) {
-		src->impl->accepted(src, type);
-	}
-}
-
-void wlr_data_source_cancelled(struct wlr_data_source *src) {
-	assert(src && src->impl);
-	if (src->impl->cancelled) {
-		src->impl->cancelled(src);
-	}
-}
-
-static void data_source_send(struct wlr_data_source *src,
-		const char *type, int fd) {
-	struct wlr_wl_data_source *wl_src = (struct wlr_wl_data_source *) src;
-	wl_data_source_send_send(wl_src->resource, type, fd);
-	close(fd);
-}
-
-static void data_source_accepted(struct wlr_data_source *src,
-		const char *type) {
-	struct wlr_wl_data_source *wl_src = (struct wlr_wl_data_source *) src;
-	wl_data_source_send_target(wl_src->resource, type);
-}
-
-static void data_source_cancelled(struct wlr_data_source *src) {
-	struct wlr_wl_data_source *wl_src = (struct wlr_wl_data_source *) src;
-	wl_data_source_send_cancelled(wl_src->resource);
-}
-
-static struct wlr_data_source_impl data_source_wl_impl = {
-	.send = data_source_send,
-	.accepted = data_source_accepted,
-	.cancelled = data_source_cancelled,
-};
-
-static void data_source_offer(struct wl_client *client,
-		struct wl_resource *resource,
-		const char *type) {
-	struct wlr_wl_data_source *src = wl_resource_get_user_data(resource);
-	char *dtype = strdup(type);
-	if (!dtype) {
-		wl_resource_post_no_memory(resource);
-		return;
-	}
-
-	wlr_list_add(src->base.types, dtype);
-}
-
-static void data_source_destroy(struct wl_client *client,
-		struct wl_resource *resource) {
-	wl_resource_destroy(resource);
-}
-
-static void data_source_set_actions(struct wl_client *client,
-		struct wl_resource *resource, uint32_t dnd_actions) {
-	wlr_log(L_DEBUG, "TODO: data source set actions");
-}
-
-static struct wl_data_source_interface wl_data_source_impl = {
-	.offer = data_source_offer,
-	.destroy = data_source_destroy,
-	.set_actions = data_source_set_actions,
-};
-
-static void destroy_wl_data_source(struct wl_resource *resource) {
-	struct wlr_wl_data_source *src = wl_resource_get_user_data(resource);
-	wlr_data_source_finish(&src->base);
-	free(src);
-}
-
-struct wlr_wl_data_source *wlr_wl_data_source_create(
-		struct wl_client *client,
-		uint32_t version, uint32_t id) {
-	struct wlr_wl_data_source *src = calloc(1, sizeof(*src));
-	if (!src) {
-		wlr_log(L_ERROR, "Failed to allocator wlr_wl_data_source");
-		wl_client_post_no_memory(client);
-		return NULL;
-	}
-
-	if (!wlr_data_source_init(&src->base, &data_source_wl_impl)) {
-		wlr_log(L_ERROR, "Failed to init wlr_wl_data_source");
-		wl_client_post_no_memory(client);
-		goto err;
-	}
-
-	if (!(src->resource = wl_resource_create(client, &wl_data_source_interface,
-			version, id))) {
-		wlr_log(L_ERROR, "Failed to create wl_resource for wlr_wl_data_source");
-		wl_client_post_no_memory(client);
-		goto err;
-	}
-
-	wl_resource_set_implementation(src->resource, &wl_data_source_impl, src,
-		destroy_wl_data_source);
-	return src;
-
-err:
-	wlr_data_source_finish(&src->base);
-	free(src);
-	return NULL;
-}

types/wlr_seat.c

@@ -6,6 +6,7 @@
 #include <wlr/types/wlr_seat.h>
 #include <wlr/types/wlr_input_device.h>
 #include <wlr/util/log.h>
+#include <wlr/types/wlr_data_device.h>
 
 static void resource_destroy(struct wl_client *client,
 		struct wl_resource *resource) {
@@ -140,6 +141,8 @@ static void wl_seat_get_touch(struct wl_client *client,
 
 static void wlr_seat_handle_resource_destroy(struct wl_resource *resource) {
 	struct wlr_seat_handle *handle = wl_resource_get_user_data(resource);
+	wl_signal_emit(&handle->wlr_seat->events.client_unbound, handle);
+
 	if (handle == handle->wlr_seat->pointer_state.focused_handle) {
 		handle->wlr_seat->pointer_state.focused_handle = NULL;
 	}
@@ -159,7 +162,6 @@ static void wlr_seat_handle_resource_destroy(struct wl_resource *resource) {
 	if (handle->data_device) {
 		wl_resource_destroy(handle->data_device);
 	}
-	wl_signal_emit(&handle->wlr_seat->events.client_unbound, handle);
 	wl_list_remove(&handle->link);
 	free(handle);
 }
@@ -302,7 +304,9 @@ struct wlr_seat *wlr_seat_create(struct wl_display *display, const char *name) {
 
 	wl_signal_init(&wlr_seat->events.client_bound);
 	wl_signal_init(&wlr_seat->events.client_unbound);
+
 	wl_signal_init(&wlr_seat->events.request_set_cursor);
+	wl_signal_init(&wlr_seat->events.selection);
 
 	wl_signal_init(&wlr_seat->events.pointer_grab_begin);
 	wl_signal_init(&wlr_seat->events.pointer_grab_end);
@@ -529,8 +533,24 @@ void wlr_seat_pointer_notify_motion(struct wlr_seat *wlr_seat, uint32_t time,
 
 uint32_t wlr_seat_pointer_notify_button(struct wlr_seat *wlr_seat,
 		uint32_t time, uint32_t button, uint32_t state) {
+	if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
+		if (wlr_seat->pointer_state.button_count == 0) {
+			wlr_seat->pointer_state.grab_button = button;
+			wlr_seat->pointer_state.grab_time = time;
+		}
+		wlr_seat->pointer_state.button_count++;
+	} else {
+		wlr_seat->pointer_state.button_count--;
+	}
+
 	struct wlr_seat_pointer_grab *grab = wlr_seat->pointer_state.grab;
-	return grab->interface->button(grab, time, button, state);
+	uint32_t serial = grab->interface->button(grab, time, button, state);
+
+	if (wlr_seat->pointer_state.button_count == 1) {
+		wlr_seat->pointer_state.grab_serial = serial;
+	}
+
+	return serial;
 }
 
 void wlr_seat_pointer_notify_axis(struct wlr_seat *wlr_seat, uint32_t time,
@@ -667,9 +687,11 @@ void wlr_seat_keyboard_start_grab(struct wlr_seat *wlr_seat,
 
 void wlr_seat_keyboard_end_grab(struct wlr_seat *wlr_seat) {
 	struct wlr_seat_keyboard_grab *grab = wlr_seat->keyboard_state.grab;
-	wlr_seat->keyboard_state.grab = wlr_seat->keyboard_state.default_grab;
 
+	if (grab != wlr_seat->keyboard_state.default_grab) {
+		wlr_seat->keyboard_state.grab = wlr_seat->keyboard_state.default_grab;
 		wl_signal_emit(&wlr_seat->events.keyboard_grab_end, grab);
+	}
 }
 
 static void keyboard_surface_destroy_notify(struct wl_listener *listener,
@@ -741,6 +763,7 @@ void wlr_seat_keyboard_enter(struct wlr_seat *wlr_seat,
 		uint32_t serial = wl_display_next_serial(wlr_seat->display);
 		wl_keyboard_send_enter(handle->keyboard, serial,
 			surface->resource, &keys);
+		wlr_seat_handle_send_selection(handle);
 	}
 
 	// reinitialize the focus destroy events

types/wlr_surface.c

@@ -269,6 +269,8 @@ static void wlr_surface_move_state(struct wlr_surface *surface, struct wlr_surfa
 		wlr_surface_state_release_buffer(state);
 		wlr_surface_state_set_buffer(state, next->buffer);
 		wlr_surface_state_reset_buffer(next);
+		state->sx = next->sx;
+		state->sy = next->sy;
 		update_size = true;
 	}
 	if (update_size) {

xwayland/meson.build

@@ -6,5 +6,12 @@ lib_wlr_xwayland = static_library(
 		'xwm.c',
 	),
 	include_directories: wlr_inc,
-	dependencies: [wayland_server, xcb, xcb_composite, xcb_icccm, pixman],
+	dependencies: [
+		wayland_server,
+		xcb,
+		xcb_composite,
+		xcb_xfixes,
+		xcb_icccm,
+		pixman,
+	],
 )

xwayland/xwm.c

@@ -3,6 +3,7 @@
 #endif
 #include <stdlib.h>
 #include <xcb/composite.h>
+#include <xcb/xfixes.h>
 #include "wlr/util/log.h"
 #include "wlr/types/wlr_surface.h"
 #include "wlr/xwayland.h"
@@ -825,9 +826,30 @@ struct wlr_xwm *xwm_create(struct wlr_xwayland *wlr_xwayland) {
 
 	// TODO more xcb init
 	// xcb_prefetch_extension_data(xwm->xcb_conn, &xcb_composite_id);
+	xcb_prefetch_extension_data(xwm->xcb_conn, &xcb_xfixes_id);
+
 	xcb_get_resources(xwm);
 	xcb_init_wm(xwm);
 
+	xwm->xfixes = xcb_get_extension_data(xwm->xcb_conn, &xcb_xfixes_id);
+
+	if (!xwm->xfixes || !xwm->xfixes->present) {
+		wlr_log(L_DEBUG, "xfixes not available");
+	}
+
+	xcb_xfixes_query_version_cookie_t xfixes_cookie;
+	xcb_xfixes_query_version_reply_t *xfixes_reply;
+	xfixes_cookie =
+		xcb_xfixes_query_version(xwm->xcb_conn, XCB_XFIXES_MAJOR_VERSION,
+			XCB_XFIXES_MINOR_VERSION);
+	xfixes_reply =
+		xcb_xfixes_query_version_reply(xwm->xcb_conn, xfixes_cookie, NULL);
+
+	wlr_log(L_DEBUG, "xfixes version: %d.%d",
+		xfixes_reply->major_version, xfixes_reply->minor_version);
+
+	free(xfixes_reply);
+
 	xwm->surface_create_listener.notify = create_surface_handler;
 	wl_signal_add(&wlr_xwayland->compositor->events.create_surface,
 		&xwm->surface_create_listener);

xwayland/xwm.h

@@ -85,6 +85,8 @@ struct wlr_xwm {
 
 	struct wl_list new_surfaces;
 	struct wl_list unpaired_surfaces;
+
+	const xcb_query_extension_reply_t *xfixes;
 };
 
 void xwm_destroy(struct wlr_xwm *xwm);