wlroots/xwayland/selection/dnd.c

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#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wlr/types/wlr_data_device.h>
#include <wlr/util/log.h>
#include <xcb/xfixes.h>
#include "xwayland/xwm.h"
#include "xwayland/selection.h"
static xcb_atom_t data_device_manager_dnd_action_to_atom(
struct wlr_xwm *xwm, enum wl_data_device_manager_dnd_action action) {
if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY) {
return xwm->atoms[DND_ACTION_COPY];
} else if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE) {
return xwm->atoms[DND_ACTION_MOVE];
} else if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK) {
return xwm->atoms[DND_ACTION_ASK];
}
return XCB_ATOM_NONE;
}
static enum wl_data_device_manager_dnd_action
data_device_manager_dnd_action_from_atom(struct wlr_xwm *xwm,
enum atom_name atom) {
if (atom == xwm->atoms[DND_ACTION_COPY] ||
atom == xwm->atoms[DND_ACTION_PRIVATE]) {
return WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
} else if (atom == xwm->atoms[DND_ACTION_MOVE]) {
return WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE;
} else if (atom == xwm->atoms[DND_ACTION_ASK]) {
return WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK;
}
return WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE;
}
static void xwm_dnd_send_event(struct wlr_xwm *xwm, xcb_atom_t type,
xcb_client_message_data_t *data) {
struct wlr_xwayland_surface *dest = xwm->drag_focus;
assert(dest != NULL);
xcb_client_message_event_t event = {
.response_type = XCB_CLIENT_MESSAGE,
.format = 32,
.sequence = 0,
.window = dest->window_id,
.type = type,
.data = *data,
};
xcb_send_event(xwm->xcb_conn,
0, // propagate
dest->window_id,
XCB_EVENT_MASK_NO_EVENT,
(const char *)&event);
xcb_flush(xwm->xcb_conn);
}
static void xwm_dnd_send_enter(struct wlr_xwm *xwm) {
struct wlr_drag *drag = xwm->drag;
assert(drag != NULL);
struct wl_array *mime_types = &drag->source->mime_types;
xcb_client_message_data_t data = { 0 };
data.data32[0] = xwm->dnd_selection.window;
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data.data32[1] = XDND_VERSION << 24;
// If we have 3 MIME types or less, we can send them directly in the
// DND_ENTER message
size_t n = mime_types->size / sizeof(char *);
if (n <= 3) {
size_t i = 0;
char **mime_type_ptr;
wl_array_for_each(mime_type_ptr, mime_types) {
char *mime_type = *mime_type_ptr;
data.data32[2+i] = xwm_mime_type_to_atom(xwm, mime_type);
++i;
}
} else {
// Let the client know that targets are not contained in the message
// data and must be retrieved with the DND_TYPE_LIST property
data.data32[1] |= 1;
xcb_atom_t targets[n];
size_t i = 0;
char **mime_type_ptr;
wl_array_for_each(mime_type_ptr, mime_types) {
char *mime_type = *mime_type_ptr;
targets[i] = xwm_mime_type_to_atom(xwm, mime_type);
++i;
}
xcb_change_property(xwm->xcb_conn,
XCB_PROP_MODE_REPLACE,
xwm->dnd_selection.window,
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xwm->atoms[DND_TYPE_LIST],
XCB_ATOM_ATOM,
32, // format
n, targets);
}
xwm_dnd_send_event(xwm, xwm->atoms[DND_ENTER], &data);
}
static void xwm_dnd_send_position(struct wlr_xwm *xwm, uint32_t time, int16_t x,
int16_t y) {
struct wlr_drag *drag = xwm->drag;
assert(drag != NULL);
xcb_client_message_data_t data = { 0 };
data.data32[0] = xwm->dnd_selection.window;
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data.data32[2] = (x << 16) | y;
data.data32[3] = time;
data.data32[4] =
data_device_manager_dnd_action_to_atom(xwm, drag->source->actions);
xwm_dnd_send_event(xwm, xwm->atoms[DND_POSITION], &data);
}
static void xwm_dnd_send_drop(struct wlr_xwm *xwm, uint32_t time) {
struct wlr_drag *drag = xwm->drag;
assert(drag != NULL);
struct wlr_xwayland_surface *dest = xwm->drag_focus;
assert(dest != NULL);
xcb_client_message_data_t data = { 0 };
data.data32[0] = xwm->dnd_selection.window;
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data.data32[2] = time;
xwm_dnd_send_event(xwm, xwm->atoms[DND_DROP], &data);
}
static void xwm_dnd_send_leave(struct wlr_xwm *xwm) {
struct wlr_drag *drag = xwm->drag;
assert(drag != NULL);
struct wlr_xwayland_surface *dest = xwm->drag_focus;
assert(dest != NULL);
xcb_client_message_data_t data = { 0 };
data.data32[0] = xwm->dnd_selection.window;
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xwm_dnd_send_event(xwm, xwm->atoms[DND_LEAVE], &data);
}
/*static void xwm_dnd_send_finished(struct wlr_xwm *xwm) {
struct wlr_drag *drag = xwm->drag;
assert(drag != NULL);
struct wlr_xwayland_surface *dest = xwm->drag_focus;
assert(dest != NULL);
xcb_client_message_data_t data = { 0 };
data.data32[0] = xwm->dnd_selection.window;
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data.data32[1] = drag->source->accepted;
if (drag->source->accepted) {
data.data32[2] = data_device_manager_dnd_action_to_atom(xwm,
drag->source->current_dnd_action);
}
xwm_dnd_send_event(xwm, xwm->atoms[DND_FINISHED], &data);
}*/
int xwm_handle_selection_client_message(struct wlr_xwm *xwm,
xcb_client_message_event_t *ev) {
if (ev->type == xwm->atoms[DND_STATUS]) {
if (xwm->drag == NULL) {
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wlr_log(WLR_DEBUG, "ignoring XdndStatus client message because "
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"there's no drag");
return 1;
}
xcb_client_message_data_t *data = &ev->data;
xcb_window_t target_window = data->data32[0];
bool accepted = data->data32[1] & 1;
xcb_atom_t action_atom = data->data32[4];
if (xwm->drag_focus == NULL ||
target_window != xwm->drag_focus->window_id) {
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wlr_log(WLR_DEBUG, "ignoring XdndStatus client message because "
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"it doesn't match the current drag focus window ID");
return 1;
}
enum wl_data_device_manager_dnd_action action =
data_device_manager_dnd_action_from_atom(xwm, action_atom);
struct wlr_drag *drag = xwm->drag;
assert(drag != NULL);
drag->source->accepted = accepted;
wlr_data_source_dnd_action(drag->source, action);
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wlr_log(WLR_DEBUG, "DND_STATUS window=%" PRIu32 " accepted=%d action=%d",
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target_window, accepted, action);
return 1;
} else if (ev->type == xwm->atoms[DND_FINISHED]) {
// This should only happen after the drag has ended, but before the drag
// source is destroyed
if (xwm->seat == NULL || xwm->seat->drag_source == NULL ||
xwm->drag != NULL) {
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wlr_log(WLR_DEBUG, "ignoring XdndFinished client message because "
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"there's no finished drag");
return 1;
}
struct wlr_data_source *source = xwm->seat->drag_source;
xcb_client_message_data_t *data = &ev->data;
xcb_window_t target_window = data->data32[0];
bool performed = data->data32[1] & 1;
xcb_atom_t action_atom = data->data32[2];
if (xwm->drag_focus == NULL ||
target_window != xwm->drag_focus->window_id) {
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wlr_log(WLR_DEBUG, "ignoring XdndFinished client message because "
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"it doesn't match the finished drag focus window ID");
return 1;
}
enum wl_data_device_manager_dnd_action action =
data_device_manager_dnd_action_from_atom(xwm, action_atom);
if (performed) {
wlr_data_source_dnd_finish(source);
}
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wlr_log(WLR_DEBUG, "DND_FINISH window=%" PRIu32 " performed=%d action=%d",
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target_window, performed, action);
return 1;
} else {
return 0;
}
}
static void seat_handle_drag_focus(struct wl_listener *listener, void *data) {
struct wlr_drag *drag = data;
struct wlr_xwm *xwm = wl_container_of(listener, xwm, seat_drag_focus);
struct wlr_xwayland_surface *focus = NULL;
if (drag->focus != NULL) {
// TODO: check for subsurfaces?
struct wlr_xwayland_surface *surface;
wl_list_for_each(surface, &xwm->surfaces, link) {
if (surface->surface == drag->focus) {
focus = surface;
break;
}
}
}
if (focus == xwm->drag_focus) {
return;
}
if (xwm->drag_focus != NULL) {
wlr_data_source_dnd_action(drag->source,
WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE);
xwm_dnd_send_leave(xwm);
}
xwm->drag_focus = focus;
if (xwm->drag_focus != NULL) {
xwm_dnd_send_enter(xwm);
}
}
static void seat_handle_drag_motion(struct wl_listener *listener, void *data) {
struct wlr_xwm *xwm = wl_container_of(listener, xwm, seat_drag_motion);
struct wlr_drag_motion_event *event = data;
struct wlr_xwayland_surface *surface = xwm->drag_focus;
if (surface == NULL) {
return; // No xwayland surface focused
}
xwm_dnd_send_position(xwm, event->time, surface->x + (int16_t)event->sx,
surface->y + (int16_t)event->sy);
}
static void seat_handle_drag_drop(struct wl_listener *listener, void *data) {
struct wlr_xwm *xwm = wl_container_of(listener, xwm, seat_drag_drop);
struct wlr_drag_drop_event *event = data;
if (xwm->drag_focus == NULL) {
return; // No xwayland surface focused
}
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wlr_log(WLR_DEBUG, "Wayland drag dropped over an Xwayland window");
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xwm_dnd_send_drop(xwm, event->time);
}
static void seat_handle_drag_destroy(struct wl_listener *listener, void *data) {
struct wlr_xwm *xwm = wl_container_of(listener, xwm, seat_drag_destroy);
// Don't reset drag focus yet because the target will read the drag source
// right after
if (xwm->drag_focus != NULL && !xwm->drag->source->accepted) {
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wlr_log(WLR_DEBUG, "Wayland drag cancelled over an Xwayland window");
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xwm_dnd_send_leave(xwm);
}
wl_list_remove(&xwm->seat_drag_focus.link);
wl_list_remove(&xwm->seat_drag_motion.link);
wl_list_remove(&xwm->seat_drag_drop.link);
wl_list_remove(&xwm->seat_drag_destroy.link);
xwm->drag = NULL;
}
static void seat_handle_drag_source_destroy(struct wl_listener *listener,
void *data) {
struct wlr_xwm *xwm =
wl_container_of(listener, xwm, seat_drag_source_destroy);
wl_list_remove(&xwm->seat_drag_source_destroy.link);
xwm->drag_focus = NULL;
}
void xwm_seat_handle_start_drag(struct wlr_xwm *xwm, struct wlr_drag *drag) {
xwm->drag = drag;
xwm->drag_focus = NULL;
if (drag != NULL) {
wl_signal_add(&drag->events.focus, &xwm->seat_drag_focus);
xwm->seat_drag_focus.notify = seat_handle_drag_focus;
wl_signal_add(&drag->events.motion, &xwm->seat_drag_motion);
xwm->seat_drag_motion.notify = seat_handle_drag_motion;
wl_signal_add(&drag->events.drop, &xwm->seat_drag_drop);
xwm->seat_drag_drop.notify = seat_handle_drag_drop;
wl_signal_add(&drag->events.destroy, &xwm->seat_drag_destroy);
xwm->seat_drag_destroy.notify = seat_handle_drag_destroy;
wl_signal_add(&drag->source->events.destroy,
&xwm->seat_drag_source_destroy);
xwm->seat_drag_source_destroy.notify = seat_handle_drag_source_destroy;
}
}