winewayland.drv: Handle the wl_data_device::motion event.

Relay the event to the IDropTarget at the new drag-and-drop position,
and notify the Wayland compositor of any accepted format/mime type and
actions.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>

dlls/winewayland.drv/unixlib.h

@@ -84,6 +84,7 @@ enum waylanddrv_client_dnd_event
 {
     CLIENT_DND_EVENT_ENTER,
     CLIENT_DND_EVENT_LEAVE,
+    CLIENT_DND_EVENT_MOTION,
 };
 
 struct waylanddrv_client_dnd_params

dlls/winewayland.drv/wayland_data_device.c

@@ -415,6 +415,42 @@ out:
 static void data_device_motion(void *data, struct wl_data_device *wl_data_device,
                                uint32_t time, wl_fixed_t x_w, wl_fixed_t y_w)
 {
+    struct waylanddrv_client_dnd_params params;
+    struct wayland_data_device *data_device = data;
+    struct wayland_data_offer *data_offer;
+    POINT point;
+
+    if (!data_device->dnd_wl_data_offer || !data_device->dnd_surface)
+        return;
+
+    data_offer = wl_data_offer_get_user_data(data_device->dnd_wl_data_offer);
+
+    data_device->dnd_x = wl_fixed_to_int(x_w);
+    data_device->dnd_y = wl_fixed_to_int(y_w);
+
+    wayland_surface_coords_to_screen(data_device->dnd_surface,
+                                     data_device->dnd_x, data_device->dnd_y,
+                                     (int *)&point.x, (int *)&point.y);
+
+    TRACE("surface=%p hwnd=%p source_actions=%x action=%x\n",
+          data_device->dnd_surface, data_device->dnd_surface->hwnd,
+          data_offer->source_actions, data_offer->action);
+
+    params.event = CLIENT_DND_EVENT_MOTION;
+    params.hwnd = HandleToULong(data_device->dnd_surface->hwnd);
+    params.point = point;
+    params.drop_effect = dnd_actions_to_drop_effect(data_offer->source_actions);
+    params.data_object = PtrToUint(data_offer);
+
+    if (WAYLANDDRV_CLIENT_CALL(dnd, &params, sizeof(params)) != 0)
+        return;
+
+    wl_data_offer_set_actions(data_device->dnd_wl_data_offer,
+                              data_offer->source_actions,
+                              data_offer->action);
+    wl_data_offer_accept(data_device->dnd_wl_data_offer,
+                         data_device->dnd_enter_serial,
+                         data_offer->accepted_mime_type);
 }
 
 static void data_device_drop(void *data, struct wl_data_device *wl_data_device)

dlls/winewayland.drv/wayland_data_device_dll.c

@@ -231,6 +231,26 @@ static NTSTATUS WINAPI waylanddrv_client_dnd_leave(void *params, ULONG size)
     return STATUS_SUCCESS;
 }
 
+static NTSTATUS WINAPI waylanddrv_client_dnd_motion(void *params, ULONG size)
+{
+    struct waylanddrv_client_dnd_params *p = params;
+    IDropTarget *drop_target;
+    DWORD drop_effect = p->drop_effect;
+    HRESULT hr;
+
+    drop_target = drop_target_from_window_point(ULongToHandle(p->hwnd), p->point);
+    if (!drop_target)
+        return STATUS_UNSUCCESSFUL;
+
+    hr = IDropTarget_DragOver(drop_target, MK_LBUTTON, *(POINTL*)&p->point,
+                              &drop_effect);
+    IDropTarget_Release(drop_target);
+    if (FAILED(hr))
+        return STATUS_UNSUCCESSFUL;
+
+    return STATUS_SUCCESS;
+}
+
 NTSTATUS WINAPI waylanddrv_client_dnd(void *params, ULONG size)
 {
     struct waylanddrv_client_dnd_params *p = params;
@@ -240,6 +260,8 @@ NTSTATUS WINAPI waylanddrv_client_dnd(void *params, ULONG size)
         return waylanddrv_client_dnd_enter(params, size);
     case CLIENT_DND_EVENT_LEAVE:
         return waylanddrv_client_dnd_leave(params, size);
+    case CLIENT_DND_EVENT_MOTION:
+        return waylanddrv_client_dnd_motion(params, size);
     }
 
     return STATUS_UNSUCCESSFUL;