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wayland: Implement Wayland_AcceptDragAndDrop()

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This simply toggles a flag that rejects DnD offers if false. Events were previously dropped silently, but rejecting the offer makes some desktops display a proper icon when the drop will not work.
This commit is contained in:
Frank Praznik
2026-05-15 13:51:14 -04:00
parent 31d6acef64
commit 336d07c2b7
4 changed files with 45 additions and 36 deletions
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73
src/video/wayland/SDL_waylandevents.c
View File

@@ -2798,15 +2798,18 @@ static void data_device_handle_enter(void *data, struct wl_data_device *wl_data_
wl_fixed_t x, wl_fixed_t y, struct wl_data_offer *id)
{
SDL_WaylandDataDevice *data_device = data;
SDL_WindowData *window = surface ? Wayland_GetWindowDataForOwnedSurface(surface) : NULL;
data_device->has_mime_file = false;
data_device->has_mime_text = false;
uint32_t dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE;
data_device->drag_serial = serial;
// Save the drag offer so it can be freed later.
if (id) {
data_device->drag_offer = wl_data_offer_get_user_data(id);
}
if (data_device->drag_offer && window && window->accepts_drag_and_drop) {
// TODO: SDL Support more mime types
#ifdef SDL_USE_LIBDBUS
if (Wayland_data_offer_has_mime(data_device->drag_offer, FILE_PORTAL_MIME)) {
@@ -2832,48 +2835,46 @@ static void data_device_handle_enter(void *data, struct wl_data_device *wl_data_
}
}
// SDL only supports "copy" style drag and drop
if (data_device->has_mime_file || data_device->has_mime_text) {
dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
} else {
// drag_mime is NULL this will decline the offer
wl_data_offer_accept(id, serial, NULL);
}
if (wl_data_offer_get_version(data_device->drag_offer->offer) >=
WL_DATA_OFFER_SET_ACTIONS_SINCE_VERSION) {
wl_data_offer_set_actions(data_device->drag_offer->offer,
dnd_action, dnd_action);
}
// find the current window
if (surface) {
SDL_WindowData *window = Wayland_GetWindowDataForOwnedSurface(surface);
if (window) {
data_device->dnd_window = window->sdlwindow;
const float dx = (float)wl_fixed_to_double(x);
const float dy = (float)wl_fixed_to_double(y);
SDL_SendDropPosition(data_device->dnd_window, dx, dy);
SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d into window %d for serial %d",
WAYLAND_wl_proxy_get_id((struct wl_proxy *)id),
wl_fixed_to_int(x), wl_fixed_to_int(y), SDL_GetWindowID(data_device->dnd_window), serial);
} else {
data_device->dnd_window = NULL;
SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d for serial %d",
WAYLAND_wl_proxy_get_id((struct wl_proxy *)id),
wl_fixed_to_int(x), wl_fixed_to_int(y), serial);
// SDL only supports "copy" style drag and drop
if (wl_data_offer_get_version(data_device->drag_offer->offer) >= WL_DATA_OFFER_SET_ACTIONS_SINCE_VERSION) {
wl_data_offer_set_actions(data_device->drag_offer->offer, WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY, WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY);
}
// Set the destination window and send the initial position.
data_device->dnd_window = window->sdlwindow;
const float dx = (float)(wl_fixed_to_double(x) * data_device->dnd_window->internal->pointer_scale.x);
const float dy = (float)(wl_fixed_to_double(y) * data_device->dnd_window->internal->pointer_scale.y);
SDL_SendDropPosition(data_device->dnd_window, dx, dy);
SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d into window %d for serial %d",
WAYLAND_wl_proxy_get_id((struct wl_proxy *)id),
wl_fixed_to_int(x), wl_fixed_to_int(y), SDL_GetWindowID(data_device->dnd_window), serial);
} else {
// Decline the offer.
wl_data_offer_accept(id, serial, NULL);
if (wl_data_offer_get_version(data_device->drag_offer->offer) >= WL_DATA_OFFER_SET_ACTIONS_SINCE_VERSION) {
wl_data_offer_set_actions(data_device->drag_offer->offer, WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE, WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE);
}
SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d for serial %d",
WAYLAND_wl_proxy_get_id((struct wl_proxy *)id),
wl_fixed_to_int(x), wl_fixed_to_int(y), serial);
WAYLAND_wl_proxy_get_id((struct wl_proxy *)id), wl_fixed_to_int(x), wl_fixed_to_int(y), serial);
}
} else {
data_device->dnd_window = NULL;
// Decline the offer.
if (id) {
wl_data_offer_accept(id, serial, NULL);
if (wl_data_offer_get_version(data_device->drag_offer->offer) >= WL_DATA_OFFER_SET_ACTIONS_SINCE_VERSION) {
wl_data_offer_set_actions(data_device->drag_offer->offer, WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE, WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE);
}
}
SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d for serial %d",
-1, wl_fixed_to_int(x), wl_fixed_to_int(y), serial);
id ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)id) : -1,
wl_fixed_to_int(x), wl_fixed_to_int(y), serial);
}
}
@@ -2911,8 +2912,8 @@ static void data_device_handle_motion(void *data, struct wl_data_device *wl_data
SDL_WaylandDataDevice *data_device = data;
if (data_device->drag_offer && data_device->dnd_window && (data_device->has_mime_file || data_device->has_mime_text)) {
const float dx = (float)wl_fixed_to_double(x);
const float dy = (float)wl_fixed_to_double(y);
const float dx = (float)(wl_fixed_to_double(x) * data_device->dnd_window->internal->pointer_scale.x);
const float dy = (float)(wl_fixed_to_double(y) * data_device->dnd_window->internal->pointer_scale.y);
/* XXX: Send the filename here if the event system ever starts passing it though.
* Any future implementation should cache the filenames, as otherwise this could

1
src/video/wayland/SDL_waylandvideo.c
View File

@@ -732,6 +732,7 @@ static SDL_VideoDevice *Wayland_CreateDevice(bool require_preferred_protocols)
device->SyncWindow = Wayland_SyncWindow;
device->SetWindowFocusable = Wayland_SetWindowFocusable;
device->ReconfigureWindow = Wayland_ReconfigureWindow;
device->AcceptDragAndDrop = Wayland_AcceptDragAndDrop;
#ifdef SDL_USE_LIBDBUS
if (SDL_SystemTheme_Init())

5
src/video/wayland/SDL_waylandwindow.c
View File

@@ -3426,6 +3426,11 @@ bool Wayland_SyncWindow(SDL_VideoDevice *_this, SDL_Window *window)
return true;
}
void Wayland_AcceptDragAndDrop(SDL_Window *window, bool accept)
{
window->internal->accepts_drag_and_drop = accept;
}
bool Wayland_SetWindowFocusable(SDL_VideoDevice *_this, SDL_Window *window, bool focusable)
{
if (window->flags & SDL_WINDOW_POPUP_MENU) {

2
src/video/wayland/SDL_waylandwindow.h
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@@ -234,6 +234,7 @@ struct SDL_WindowData
bool scale_to_display;
bool reparenting_required;
bool double_buffer;
bool accepts_drag_and_drop;
SDL_HitTestResult hit_test_result;
@@ -271,6 +272,7 @@ extern bool Wayland_SetWindowIcon(SDL_VideoDevice *_this, SDL_Window *window, SD
extern bool Wayland_SetWindowFocusable(SDL_VideoDevice *_this, SDL_Window *window, bool focusable);
extern float Wayland_GetWindowContentScale(SDL_VideoDevice *_this, SDL_Window *window);
extern void *Wayland_GetWindowICCProfile(SDL_VideoDevice *_this, SDL_Window *window, size_t *size);
extern void Wayland_AcceptDragAndDrop(SDL_Window *window, bool accept);
extern bool Wayland_SetWindowHitTest(SDL_Window *window, bool enabled);
extern bool Wayland_FlashWindow(SDL_VideoDevice *_this, SDL_Window *window, SDL_FlashOperation operation);