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gtk2/gdk/win32/gdkdrag-win32.c
Chun-wei Fan 8acce5f294 gdk/win32: Drop local DnD protocol 
It is basically not used by default and is pretty much broken at this point, so
it's about time to drop it.

Let's focus on fixing the OLE2 DnD protocol.
2021-08-06 17:16:27 +08:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
* Copyright (C) 2001 Archaeopteryx Software Inc.
* Copyright (C) 1998-2002 Tor Lillqvist
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include <string.h>
#include "gdk-private.h"
#include <io.h>
#include <fcntl.h>
#include <math.h>
/*
* Support for OLE-2 drag and drop added at Archaeopteryx Software, 2001
* For more information, do not contact Stephan R.A. Deibel (sdeibel@archaeopteryx.com),
* because the code went through multiple modifications since then.
*
* Notes on the implementation:
*
* Source drag context, IDropSource and IDataObject for it are created
* (almost) simultaneously, whereas target drag context and IDropTarget
* are separated in time - IDropTarget is created when a window is made
* to accept drops, while target drag context is created when a dragging
* cursor enters the window and is destroyed when that cursor leaves
* the window.
*
* There's a mismatch between data types supported by W32 (W32 formats)
* and by GTK (GDK contentformats).
* To account for it the data is transmuted back and forth. There are two
* main points of transmutation:
* * GdkWin32HDATAOutputStream: transmutes GTK data to W32 data
* * GdkWin32Drop: transmutes W32 data to GTK data
*
* There are also two points where data formats are considered:
* * When source drag context is created, it gets a list of GDK contentformats
* that it supports, these are matched to the W32 formats they
* correspond to (possibly with transmutation). New W32 formats for
* GTK-specific contentformats are also created here (see below).
* * When target drop context is created, it queries the IDataObject
* for the list of W32 formats it supports and matches these to
* corresponding GDK contentformats that it will be able to provide
* (possibly with transmutation) later. Missing GDK contentformats for
* W32-specific formats are also created here (see below).
*
* W32 formats are integers (CLIPFORMAT), while GTK contentformats
* are mime/type strings, and cannot be used interchangeably.
*
* To accommodate advanced GTK applications the code allows them to
* register drop targets that accept W32 data formats, and to register
* drag sources that provide W32 data formats. To do that they must
* register with the mime/type "application/x.windows.ZZZ", where
* ZZZ is the string name of the format in question
* (for example, "Shell IDList Array") or, for unnamed pre-defined
* formats, register with the stringified constant name of the format
* in question (for example, "CF_UNICODETEXT").
* If such contentformat is accepted/provided, GDK will not try to
* transmute it to/from something else. Otherwise GDK will do the following
* transmutation:
* * If GTK application provides image/png, image/gif or image/jpeg,
* GDK will claim to also provide "PNG", "GIF" or "JFIF" respectively,
* and will pass these along verbatim.
* * If GTK application provides any GdkPixbuf-compatible contentformat,
* GDK will also offer "PNG" and CF_DIB W32 formats.
* * If GTK application provides text/plain;charset=utf8, GDK will also offer
* CF_UNICODETEXT (UTF-16-encoded) and CF_TEXT (encoded with thread-
* and locale-dependent codepage), and will do the conversion when such
* data is requested.
* * If GTK application accepts image/png, image/gif or image/jpeg,
* GDK will claim to also accept "PNG", "GIF" or "JFIF" respectively,
* and will pass these along verbatim.
* * If GTK application accepts image/bmp, GDK will
* claim to accept CF_DIB W32 format, and will convert
* it, changing the header, when such data is provided.
* * If GTK application accepts text/plain;charset=utf8, GDK will
* claim to accept CF_UNICODETEXT and CF_TEXT, and will do
* the conversion when such data is provided.
* * If GTK application accepts text/uri-list, GDK will
* claim to accept "Shell IDList Array", and will do the
* conversion when such data is provided.
*
* Currently the conversion from text/uri-list to "Shell IDList Array" is not
* implemented, so it's not possible to drag & drop files from GTK
* applications to non-GTK applications the same way one can drag files
* from Windows Explorer.
*
* To increase inter-GTK compatibility, GDK will register GTK-specific
* formats by their mime/types, as-is (i.e "text/plain;charset=utf-8", for example).
* That way two GTK applications can exchange data in their native formats
* (both well-known ones, such as text/plain;charset=utf8, and special,
* known only to specific applications). This will work just
* fine as long as both applications agree on what kind of data is stored
* under such format exactly.
*
* Note that clipboard format space is limited, there can only be 16384
* of them for a particular user session. Therefore it is highly inadvisable
* to create and register such formats out of the whole cloth, dynamically.
* If more flexibility is needed, register one format that has some
* internal indicators of the kind of data it contains, then write the application
* in such a way that it requests the data and inspects its header before deciding
* whether to accept it or not. For details see GTK drag & drop documentation
* on the "drag-motion" and "drag-data-received" signals.
*
* How managed DnD works:
* GTK widget detects a drag gesture and calls
* S: gdk_drag_begin_from_point() -> backend:drag_begin()
* which creates the source drag context and the drag window,
* and grabs the pointing device. GDK layer adds the context
* to a list of currently-active contexts.
*
* From that point forward the context gets any events emitted
* by GDK, and can prevent these events from going anywhere else.
* They are all handled in
* S: gdk_drag_handle_source_event() -> backend:handle_event()
* (except for wayland backend - it doesn't have that function).
*
* That function catches the following events:
* GDK_MOTION_NOTIFY
* GDK_BUTTON_RELEASE
* GDK_KEY_PRESS
* GDK_KEY_RELEASE
* GDK_GRAB_BROKEN
*
* GDK_MOTION_NOTIFY is emitted by the backend in response to
* mouse movement.
* Drag context handles it by calling a bunch of functions to
* determine the state of the drag actions from the keys being
* pressed, finding the drag window (another backend function
* routed through GDK layer) and finally calls
* S: gdk_drag_motion -> backend:drag_motion()
* to notify the backend (i.e. itself) that the drag cursor
* moved.
* The response to that is to move the drag window and
* do various bookkeeping.
* W32: OLE2 protocol does nothing (other than moving the
* drag window) in response to this, as all the functions
* that GDK could perform here are already handled by the
* OS driving the DnD process via DoDragDrop() call.
*
* GDK_BUTTON_RELEASE checks the
* released button - if it's the button that was used to
* initiate the drag, the "drop-performed" signal is emitted,
* otherwise the drag is cancelled.
*
* GDK_KEY_PRESS and GDK_KEY_RELEASE handler does exactly the same thing as
* GDK_MOTION_NOTIFY handler, but only after it checks the pressed
* keys to emit "drop-performed" signal (on Space, Enter etc),
* cancel the drag (on Escape) or move the drag cursor (arrow keys).
*
* GDK_GRAB_BROKEN handler cancels the drag for most broken grabs
* (except for some special cases where the backend itself does
* temporary grabs as part of DnD, such as changing the cursor).
*
* GDK_DRAG_ENTER, GDK_DRAG_LEAVE, GDK_DRAG_MOTION and GDK_DROP_START
* events are emitted when
* the OS notifies the process about these things happening.
* For X11 backend that is done in Xdnd event filters,
* for W32 backend this is done in IDropSource/IDropTarget
* object methods for the OLE2 protocol.
*
*/
/* The mingw.org compiler does not export GUIDS in it's import library. To work
* around that, define INITGUID to have the GUIDS declared. */
#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
#define INITGUID
#endif
/* For C-style COM wrapper macros */
#define COBJMACROS
#include "gdkdrag.h"
#include "gdkinternals.h"
#include "gdkprivate-win32.h"
#include "gdkwin32.h"
#include "gdkwin32dnd.h"
#include "gdkdisplayprivate.h"
#include "gdk/gdkdragprivate.h"
#include "gdkwin32dnd-private.h"
#include "gdkdisplay-win32.h"
#include "gdkdevice-win32.h"
#include "gdkdeviceprivate.h"
#include "gdkhdataoutputstream-win32.h"
#include <ole2.h>
#include <shlobj.h>
#include <shlguid.h>
#include <objidl.h>
#include "gdkintl.h"
#include <gdk/gdk.h>
#include <glib/gstdio.h>
/* Just to avoid calling RegisterWindowMessage() every time */
static UINT thread_wakeup_message;
typedef struct
{
IDropSource ids;
IDropSourceNotify idsn;
int ref_count;
GdkDrag *drag;
/* These are thread-local
* copies of the similar fields from GdkWin32Drag
*/
GdkWin32DragUtilityData util_data;
/* Cached here, so that we don't have to look in
* the context every time.
*/
HWND source_window_handle;
guint scale;
/* We get this from the OS via IDropSourceNotify and pass it to the
* main thread.
* Will be INVALID_HANDLE_VALUE (not NULL!) when unset.
*/
HWND dest_window_handle;
} source_drag_context;
typedef struct {
IDataObject ido;
int ref_count;
GdkDrag *drag;
GArray *formats;
} data_object;
typedef struct {
IEnumFORMATETC ief;
int ref_count;
int ix;
GArray *formats;
} enum_formats;
typedef enum _GdkWin32DnDThreadQueueItemType GdkWin32DnDThreadQueueItemType;
enum _GdkWin32DnDThreadQueueItemType
{
GDK_WIN32_DND_THREAD_QUEUE_ITEM_GIVE_FEEDBACK = 1,
GDK_WIN32_DND_THREAD_QUEUE_ITEM_DRAG_INFO = 2,
GDK_WIN32_DND_THREAD_QUEUE_ITEM_DO_DRAG_DROP = 3,
GDK_WIN32_DND_THREAD_QUEUE_ITEM_GET_DATA = 4,
GDK_WIN32_DND_THREAD_QUEUE_ITEM_UPDATE_DRAG_STATE = 5,
};
typedef struct _GdkWin32DnDThreadQueueItem GdkWin32DnDThreadQueueItem;
struct _GdkWin32DnDThreadQueueItem
{
GdkWin32DnDThreadQueueItemType item_type;
/* This is used by the DnD thread to communicate the identity
* of the drag context to the main thread. This is thread-safe
* because DnD thread holds a reference to the context.
*/
gpointer opaque_context;
};
typedef struct _GdkWin32DnDThreadDoDragDrop GdkWin32DnDThreadDoDragDrop;
/* This is used both to signal the DnD thread that it needs
* to call DoDragDrop(), *and* to signal the main thread
* that the DoDragDrop() call returned.
*/
struct _GdkWin32DnDThreadDoDragDrop
{
GdkWin32DnDThreadQueueItem base;
source_drag_context *src_context;
data_object *src_object;
DWORD allowed_drop_effects;
DWORD received_drop_effect;
HRESULT received_result;
};
typedef struct _GdkWin32DnDThreadGetData GdkWin32DnDThreadGetData;
/* This is used both to signal the main thread that the DnD thread
* needs DnD data, and to give that data to the DnD thread.
*/
struct _GdkWin32DnDThreadGetData
{
GdkWin32DnDThreadQueueItem base;
GdkWin32ContentFormatPair pair;
GdkWin32HDataOutputStream *stream;
STGMEDIUM produced_data_medium;
};
typedef struct _GdkWin32DnDThreadGiveFeedback GdkWin32DnDThreadGiveFeedback;
struct _GdkWin32DnDThreadGiveFeedback
{
GdkWin32DnDThreadQueueItem base;
DWORD received_drop_effect;
};
typedef struct _GdkWin32DnDThreadDragInfo GdkWin32DnDThreadDragInfo;
struct _GdkWin32DnDThreadDragInfo
{
GdkWin32DnDThreadQueueItem base;
BOOL received_escape_pressed;
DWORD received_keyboard_mods;
};
typedef struct _GdkWin32DnDThreadUpdateDragState GdkWin32DnDThreadUpdateDragState;
struct _GdkWin32DnDThreadUpdateDragState
{
GdkWin32DnDThreadQueueItem base;
gpointer opaque_ddd;
GdkWin32DragUtilityData produced_util_data;
};
typedef struct _GdkWin32DnDThread GdkWin32DnDThread;
struct _GdkWin32DnDThread
{
/* We receive instructions from the main thread in this queue */
GAsyncQueue *input_queue;
/* We can't peek the queue or "unpop" queue items,
* so the items that we can't act upon (yet) got
* to be stored *somewhere*.
*/
GList *dequeued_items;
source_drag_context *src_context;
data_object *src_object;
};
/* The code is much more secure if we don't rely on the OS to keep
* this around for us.
*/
static GdkWin32DnDThread *dnd_thread_data = NULL;
static gboolean
dnd_queue_is_empty ()
{
return g_atomic_int_get (&_win32_clipdrop->dnd_queue_counter) == 0;
}
static void
decrement_dnd_queue_counter ()
{
g_atomic_int_dec_and_test (&_win32_clipdrop->dnd_queue_counter);
}
static void
increment_dnd_queue_counter ()
{
g_atomic_int_inc (&_win32_clipdrop->dnd_queue_counter);
}
static void
free_queue_item (GdkWin32DnDThreadQueueItem *item)
{
GdkWin32DnDThreadGetData *getdata;
switch (item->item_type)
{
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_DO_DRAG_DROP:
/* Don't unref anything, it's all done in the main thread,
* when it receives a DoDragDrop reply.
*/
break;
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_UPDATE_DRAG_STATE:
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_GIVE_FEEDBACK:
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_DRAG_INFO:
/* These have no data to clean up */
break;
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_GET_DATA:
getdata = (GdkWin32DnDThreadGetData *) item;
switch (getdata->produced_data_medium.tymed)
{
case TYMED_FILE:
case TYMED_ISTREAM:
case TYMED_ISTORAGE:
case TYMED_GDI:
case TYMED_MFPICT:
case TYMED_ENHMF:
g_critical ("Unsupported STGMEDIUM type");
break;
case TYMED_NULL:
break;
case TYMED_HGLOBAL:
GlobalFree (getdata->produced_data_medium.hGlobal);
break;
}
}
g_free (item);
}
static gboolean
process_dnd_queue (gboolean timed,
guint64 end_time,
GdkWin32DnDThreadGetData *getdata_check)
{
GdkWin32DnDThreadQueueItem *item;
GdkWin32DnDThreadUpdateDragState *updatestate;
GdkWin32DnDThreadDoDragDrop *ddd;
while (TRUE)
{
if (timed)
{
guint64 current_time = g_get_monotonic_time ();
if (current_time >= end_time)
break;
item = g_async_queue_timeout_pop (dnd_thread_data->input_queue, end_time - current_time);
}
else
{
item = g_async_queue_try_pop (dnd_thread_data->input_queue);
}
if (item == NULL)
break;
decrement_dnd_queue_counter ();
switch (item->item_type)
{
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_DO_DRAG_DROP:
/* We don't support more than one DnD at a time */
free_queue_item (item);
break;
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_UPDATE_DRAG_STATE:
updatestate = (GdkWin32DnDThreadUpdateDragState *) item;
ddd = (GdkWin32DnDThreadDoDragDrop *) updatestate->opaque_ddd;
ddd->src_context->util_data = updatestate->produced_util_data;
free_queue_item (item);
break;
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_GET_DATA:
if (item == (GdkWin32DnDThreadQueueItem *) getdata_check)
return TRUE;
free_queue_item (item);
break;
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_GIVE_FEEDBACK:
case GDK_WIN32_DND_THREAD_QUEUE_ITEM_DRAG_INFO:
g_assert_not_reached ();
}
}
return FALSE;
}
static gboolean
do_drag_drop_response (gpointer user_data)
{
GdkWin32DnDThreadDoDragDrop *ddd = (GdkWin32DnDThreadDoDragDrop *) user_data;
HRESULT hr = ddd->received_result;
GdkDrag *drag = GDK_DRAG (ddd->base.opaque_context);
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GdkWin32Clipdrop *clipdrop = _gdk_win32_clipdrop_get ();
gpointer table_value = g_hash_table_lookup (clipdrop->active_source_drags, drag);
if (ddd == table_value)
{
GDK_NOTE (DND, g_print ("DoDragDrop returned %s with effect %lu\n",
(hr == DRAGDROP_S_DROP ? "DRAGDROP_S_DROP" :
(hr == DRAGDROP_S_CANCEL ? "DRAGDROP_S_CANCEL" :
(hr == E_UNEXPECTED ? "E_UNEXPECTED" :
g_strdup_printf ("%#.8lx", hr)))), ddd->received_drop_effect));
drag_win32->drop_failed = !(SUCCEEDED (hr) || hr == DRAGDROP_S_DROP);
/* We used to delete the selection here,
* now GTK does that automatically in response to
* the "dnd-finished" signal,
* if the operation was successful and was a move.
*/
GDK_NOTE (DND, g_print ("gdk_dnd_handle_drop_finished: 0x%p\n",
drag));
g_signal_emit_by_name (drag, "dnd-finished");
gdk_drag_drop_done (drag, !drag_win32->drop_failed);
}
else
{
if (!table_value)
g_critical ("Did not find drag 0x%p in the active drags table", drag);
else
g_critical ("Found drag 0x%p in the active drags table, but the record doesn't match (0x%p != 0x%p)", drag, ddd, table_value);
}
/* 3rd parties could keep a reference to this object,
* but we won't keep the drag alive that long.
* Neutralize it (attempts to get its data will fail)
* by nullifying the drag pointer (it doesn't hold
* a reference, so no unreffing).
*/
g_clear_object (&ddd->src_object->drag);
IDropSource_Release (&ddd->src_context->ids);
IDataObject_Release (&ddd->src_object->ido);
g_hash_table_remove (clipdrop->active_source_drags, drag);
free_queue_item (&ddd->base);
return G_SOURCE_REMOVE;
}
static void
received_drag_context_data (GObject *drag,
GAsyncResult *result,
gpointer user_data)
{
GError *error = NULL;
GdkWin32DnDThreadGetData *getdata = (GdkWin32DnDThreadGetData *) user_data;
GdkWin32Clipdrop *clipdrop = _gdk_win32_clipdrop_get ();
if (!gdk_drag_write_finish (GDK_DRAG (drag), result, &error))
{
HANDLE handle;
gboolean is_hdata;
GDK_NOTE (DND, g_printerr ("%p: failed to write HData-backed stream: %s\n", drag, error->message));
g_error_free (error);
g_output_stream_close (G_OUTPUT_STREAM (getdata->stream), NULL, NULL);
handle = gdk_win32_hdata_output_stream_get_handle (getdata->stream, &is_hdata);
if (is_hdata)
API_CALL (GlobalFree, (handle));
else
API_CALL (CloseHandle, (handle));
}
else
{
g_output_stream_close (G_OUTPUT_STREAM (getdata->stream), NULL, NULL);
getdata->produced_data_medium.tymed = TYMED_HGLOBAL;
getdata->produced_data_medium.hGlobal = gdk_win32_hdata_output_stream_get_handle (getdata->stream, NULL);
}
g_clear_object (&getdata->stream);
increment_dnd_queue_counter ();
g_async_queue_push (clipdrop->dnd_queue, getdata);
API_CALL (PostThreadMessage, (clipdrop->dnd_thread_id, thread_wakeup_message, 0, 0));
}
static gboolean
get_data_response (gpointer user_data)
{
GdkWin32DnDThreadGetData *getdata = (GdkWin32DnDThreadGetData *) user_data;
GdkWin32Clipdrop *clipdrop = _gdk_win32_clipdrop_get ();
GdkDrag *drag = GDK_DRAG (getdata->base.opaque_context);
gpointer ddd = g_hash_table_lookup (clipdrop->active_source_drags, drag);
GDK_NOTE (DND, g_print ("idataobject_getdata will request target 0x%p (%s)",
getdata->pair.contentformat, getdata->pair.contentformat));
/* This just verifies that we got the right drag,
* we don't need the ddd struct itself.
*/
if (ddd)
{
GError *error = NULL;
GOutputStream *stream = gdk_win32_hdata_output_stream_new (&getdata->pair, &error);
if (stream)
{
getdata->stream = GDK_WIN32_HDATA_OUTPUT_STREAM (stream);
gdk_drag_write_async (drag,
getdata->pair.contentformat,
stream,
G_PRIORITY_DEFAULT,
NULL,
received_drag_context_data,
getdata);
return G_SOURCE_REMOVE;
}
}
increment_dnd_queue_counter ();
g_async_queue_push (clipdrop->dnd_queue, getdata);
API_CALL (PostThreadMessage, (clipdrop->dnd_thread_id, thread_wakeup_message, 0, 0));
return G_SOURCE_REMOVE;
}
static void
do_drag_drop (GdkWin32DnDThreadDoDragDrop *ddd)
{
HRESULT hr;
dnd_thread_data->src_object = ddd->src_object;
dnd_thread_data->src_context = ddd->src_context;
hr = DoDragDrop (&dnd_thread_data->src_object->ido,
&dnd_thread_data->src_context->ids,
ddd->allowed_drop_effects,
&ddd->received_drop_effect);
ddd->received_result = hr;
g_idle_add_full (G_PRIORITY_DEFAULT, do_drag_drop_response, ddd, NULL);
}
gpointer
_gdk_win32_dnd_thread_main (gpointer data)
{
GAsyncQueue *queue = (GAsyncQueue *) data;
GdkWin32DnDThreadQueueItem *item;
MSG msg;
HRESULT hr;
g_assert (dnd_thread_data == NULL);
dnd_thread_data = g_new0 (GdkWin32DnDThread, 1);
dnd_thread_data->input_queue = queue;
CoInitializeEx (NULL, COINIT_APARTMENTTHREADED);
hr = OleInitialize (NULL);
if (!SUCCEEDED (hr))
g_error ("OleInitialize failed");
/* Create a message queue */
PeekMessage (&msg, NULL, WM_USER, WM_USER, PM_NOREMOVE);
thread_wakeup_message = RegisterWindowMessage ("GDK_WORKER_THREAD_WEAKEUP");
/* Signal the main thread that we're ready.
* This is the only time the queue works in reverse.
*/
g_async_queue_push (queue, GUINT_TO_POINTER (GetCurrentThreadId ()));
while (GetMessage (&msg, NULL, 0, 0))
{
if (!dnd_queue_is_empty ())
{
while ((item = g_async_queue_try_pop (queue)) != NULL)
{
decrement_dnd_queue_counter ();
if (item->item_type != GDK_WIN32_DND_THREAD_QUEUE_ITEM_DO_DRAG_DROP)
{
free_queue_item (item);
continue;
}
do_drag_drop ((GdkWin32DnDThreadDoDragDrop *) item);
API_CALL (PostThreadMessage, (GetCurrentThreadId (), thread_wakeup_message, 0, 0));
break;
}
}
/* Just to be safe, although this mostly does nothing */
TranslateMessage (&msg);
DispatchMessage (&msg);
}
g_async_queue_unref (queue);
g_clear_pointer (&dnd_thread_data, g_free);
OleUninitialize ();
CoUninitialize ();
return NULL;
}
static gboolean drag_context_grab (GdkDrag *drag);
G_DEFINE_TYPE (GdkWin32Drag, gdk_win32_drag, GDK_TYPE_DRAG)
static void
move_drag_surface (GdkDrag *drag,
guint x_root,
guint y_root)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
g_assert (_win32_main_thread == NULL ||
_win32_main_thread == g_thread_self ());
gdk_win32_surface_move (drag_win32->drag_surface,
x_root - drag_win32->hot_x,
y_root - drag_win32->hot_y);
gdk_win32_surface_raise (drag_win32->drag_surface);
}
static void
gdk_win32_drag_init (GdkWin32Drag *drag)
{
g_assert (_win32_main_thread == NULL ||
_win32_main_thread == g_thread_self ());
drag->handle_events = TRUE;
drag->dest_window = INVALID_HANDLE_VALUE;
GDK_NOTE (DND, g_print ("gdk_win32_drag_init %p\n", drag));
}
static void
gdk_win32_drag_finalize (GObject *object)
{
GdkDrag *drag;
GdkWin32Drag *drag_win32;
GdkSurface *drag_surface;
g_assert (_win32_main_thread == NULL ||
_win32_main_thread == g_thread_self ());
GDK_NOTE (DND, g_print ("gdk_win32_drag_finalize %p\n", object));
g_return_if_fail (GDK_IS_WIN32_DRAG (object));
drag = GDK_DRAG (object);
drag_win32 = GDK_WIN32_DRAG (drag);
gdk_drag_set_cursor (drag, NULL);
g_set_object (&drag_win32->grab_surface, NULL);
drag_surface = drag_win32->drag_surface;
G_OBJECT_CLASS (gdk_win32_drag_parent_class)->finalize (object);
if (drag_surface)
gdk_surface_destroy (drag_surface);
}
/* Drag Contexts */
static GdkDrag *
gdk_drag_new (GdkDisplay *display,
GdkSurface *surface,
GdkContentProvider *content,
GdkDragAction actions,
GdkDevice *device)
{
GdkWin32Drag *drag_win32;
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
GdkDrag *drag;
drag_win32 = g_object_new (GDK_TYPE_WIN32_DRAG,
"device", device,
"content", content,
"surface", surface,
"actions", actions,
NULL);
drag = GDK_DRAG (drag_win32);
if (display_win32->has_fixed_scale)
drag_win32->scale = display_win32->surface_scale;
else
drag_win32->scale = gdk_win32_display_get_monitor_scale_factor (display_win32, NULL, NULL);
return drag;
}
#define PRINT_GUID(guid) \
g_print ("%.08lx-%.04x-%.04x-%.02x%.02x-%.02x%.02x%.02x%.02x%.02x%.02x", \
((gulong *) guid)[0], \
((gushort *) guid)[2], \
((gushort *) guid)[3], \
((guchar *) guid)[8], \
((guchar *) guid)[9], \
((guchar *) guid)[10], \
((guchar *) guid)[11], \
((guchar *) guid)[12], \
((guchar *) guid)[13], \
((guchar *) guid)[14], \
((guchar *) guid)[15]);
static enum_formats *enum_formats_new (GArray *formats);
/* Finds a GdkDrag object that corresponds to a DnD operation
* which is currently targeting the dest_window
* Does not give a reference.
*/
GdkDrag *
_gdk_win32_find_drag_for_dest_window (HWND dest_window)
{
GHashTableIter iter;
GdkWin32Drag *drag_win32;
GdkWin32DnDThreadDoDragDrop *ddd;
GdkWin32Clipdrop *clipdrop = _gdk_win32_clipdrop_get ();
g_hash_table_iter_init (&iter, clipdrop->active_source_drags);
while (g_hash_table_iter_next (&iter, (gpointer *) &drag_win32, (gpointer *) &ddd))
if (ddd->src_context->dest_window_handle == dest_window)
return GDK_DRAG (drag_win32);
return NULL;
}
static GdkDragAction
action_for_drop_effect (DWORD effect)
{
GdkDragAction action = 0;
if (effect & DROPEFFECT_MOVE)
action |= GDK_ACTION_MOVE;
if (effect & DROPEFFECT_LINK)
action |= GDK_ACTION_LINK;
if (effect & DROPEFFECT_COPY)
action |= GDK_ACTION_COPY;
return action;
}
static ULONG STDMETHODCALLTYPE
idropsource_addref (LPDROPSOURCE This)
{
source_drag_context *ctx = (source_drag_context *) This;
int ref_count = ++ctx->ref_count;
GDK_NOTE (DND, g_print ("idropsource_addref %p %d\n", This, ref_count));
return ref_count;
}
typedef struct _GdkWin32DnDEnterLeaveNotify GdkWin32DnDEnterLeaveNotify;
struct _GdkWin32DnDEnterLeaveNotify
{
gpointer opaque_context;
HWND target_window_handle;
};
static gboolean
notify_dnd_enter (gpointer user_data)
{
GdkWin32DnDEnterLeaveNotify *notify = (GdkWin32DnDEnterLeaveNotify *) user_data;
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (notify->opaque_context);
drag_win32->dest_window = notify->target_window_handle;
g_free (notify);
return G_SOURCE_REMOVE;
}
static gboolean
notify_dnd_leave (gpointer user_data)
{
GdkWin32DnDEnterLeaveNotify *notify = (GdkWin32DnDEnterLeaveNotify *) user_data;
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (notify->opaque_context);
if (notify->target_window_handle != drag_win32->dest_window)
g_warning ("DnD leave says that the window handle is 0x%p, but drag has 0x%p", notify->target_window_handle, drag_win32->dest_window);
drag_win32->dest_window = INVALID_HANDLE_VALUE;
g_free (notify);
return G_SOURCE_REMOVE;
}
static HRESULT STDMETHODCALLTYPE
idropsourcenotify_dragentertarget (IDropSourceNotify *This,
HWND hwndTarget)
{
source_drag_context *ctx = (source_drag_context *) (((char *) This) - G_STRUCT_OFFSET (source_drag_context, idsn));
GdkWin32DnDEnterLeaveNotify *notify;
if (!dnd_queue_is_empty ())
process_dnd_queue (FALSE, 0, NULL);
GDK_NOTE (DND, g_print ("idropsourcenotify_dragentertarget %p (SDC %p) 0x%p\n", This, ctx, hwndTarget));
ctx->dest_window_handle = hwndTarget;
notify = g_new0 (GdkWin32DnDEnterLeaveNotify, 1);
notify->target_window_handle = hwndTarget;
notify->opaque_context = ctx->drag;
g_idle_add_full (G_PRIORITY_DEFAULT, notify_dnd_enter, notify, NULL);
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
idropsourcenotify_dragleavetarget (IDropSourceNotify *This)
{
source_drag_context *ctx = (source_drag_context *) (((char *) This) - G_STRUCT_OFFSET (source_drag_context, idsn));
GdkWin32DnDEnterLeaveNotify *notify;
if (!dnd_queue_is_empty ())
process_dnd_queue (FALSE, 0, NULL);
GDK_NOTE (DND, g_print ("idropsourcenotify_dragleavetarget %p (SDC %p) 0x%p\n", This, ctx, ctx->dest_window_handle));
notify = g_new0 (GdkWin32DnDEnterLeaveNotify, 1);
notify->target_window_handle = ctx->dest_window_handle;
ctx->dest_window_handle = INVALID_HANDLE_VALUE;
notify->opaque_context = ctx->drag;
g_idle_add_full (G_PRIORITY_DEFAULT, notify_dnd_leave, notify, NULL);
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
idropsource_queryinterface (LPDROPSOURCE This,
REFIID riid,
LPVOID *ppvObject)
{
GDK_NOTE (DND, {
g_print ("idropsource_queryinterface %p ", This);
PRINT_GUID (riid);
});
*ppvObject = NULL;
if (IsEqualGUID (riid, &IID_IUnknown))
{
GDK_NOTE (DND, g_print ("...IUnknown S_OK\n"));
idropsource_addref (This);
*ppvObject = This;
return S_OK;
}
else if (IsEqualGUID (riid, &IID_IDropSource))
{
GDK_NOTE (DND, g_print ("...IDropSource S_OK\n"));
idropsource_addref (This);
*ppvObject = This;
return S_OK;
}
else if (IsEqualGUID (riid, &IID_IDropSourceNotify))
{
GDK_NOTE (DND, g_print ("...IDropSourceNotify S_OK\n"));
idropsource_addref (This);
*ppvObject = &((source_drag_context *) This)->idsn;
return S_OK;
}
else
{
GDK_NOTE (DND, g_print ("...E_NOINTERFACE\n"));
return E_NOINTERFACE;
}
}
static gboolean
unref_context_in_main_thread (gpointer opaque_context)
{
GdkDrag *drag = GDK_DRAG (opaque_context);
g_clear_object (&drag);
return G_SOURCE_REMOVE;
}
static ULONG STDMETHODCALLTYPE
idropsource_release (LPDROPSOURCE This)
{
source_drag_context *ctx = (source_drag_context *) This;
int ref_count = --ctx->ref_count;
GDK_NOTE (DND, g_print ("idropsource_release %p %d\n", This, ref_count));
if (ref_count == 0)
{
g_idle_add (unref_context_in_main_thread, ctx->drag);
g_free (This);
}
return ref_count;
}
/* NOTE: This method is called continuously, even if nothing is
* happening, as long as the drag operation is in progress.
* It is OK to return a "safe" value (S_OK, to keep the drag
* operation going) even if something notable happens, because
* we will have another opportunity to return the "right" value
* (once we know what it is, after GTK processes the events we
* send out) very soon.
* Note that keyboard-related state in this function is nonsense,
* as DoDragDrop doesn't get precise information about the keyboard,
* especially the fEscapePressed argument.
*/
static HRESULT STDMETHODCALLTYPE
idropsource_querycontinuedrag (LPDROPSOURCE This,
BOOL fEscapePressed,
DWORD grfKeyState)
{
source_drag_context *ctx = (source_drag_context *) This;
GDK_NOTE (DND, g_print ("idropsource_querycontinuedrag %p esc=%d keystate=0x%lx with state %d\n", This, fEscapePressed, grfKeyState, ctx->util_data.state));
if (!dnd_queue_is_empty ())
process_dnd_queue (FALSE, 0, NULL);
GDK_NOTE (DND, g_print ("idropsource_querycontinuedrag state %d\n", ctx->util_data.state));
if (ctx->util_data.state == GDK_WIN32_DND_DROPPED)
{
GDK_NOTE (DND, g_print ("DRAGDROP_S_DROP\n"));
return DRAGDROP_S_DROP;
}
else if (ctx->util_data.state == GDK_WIN32_DND_NONE)
{
GDK_NOTE (DND, g_print ("DRAGDROP_S_CANCEL\n"));
return DRAGDROP_S_CANCEL;
}
else
{
GDK_NOTE (DND, g_print ("S_OK\n"));
return S_OK;
}
}
static void
maybe_emit_action_changed (GdkWin32Drag *drag_win32,
GdkDragAction actions)
{
if (actions != drag_win32->current_action)
{
drag_win32->current_action = actions;
gdk_drag_set_selected_action (GDK_DRAG (drag_win32), actions);
}
}
static gboolean
give_feedback (gpointer user_data)
{
GdkWin32DnDThreadGiveFeedback *feedback = (GdkWin32DnDThreadGiveFeedback *) user_data;
GdkWin32Clipdrop *clipdrop = _gdk_win32_clipdrop_get ();
gpointer ddd = g_hash_table_lookup (clipdrop->active_source_drags, feedback->base.opaque_context);
if (ddd)
{
GdkDrag *drag = GDK_DRAG (feedback->base.opaque_context);
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GDK_NOTE (DND, g_print ("gdk_dnd_handle_drag_status: 0x%p\n",
drag));
maybe_emit_action_changed (drag_win32, action_for_drop_effect (feedback->received_drop_effect));
}
free_queue_item (&feedback->base);
return G_SOURCE_REMOVE;
}
static HRESULT STDMETHODCALLTYPE
idropsource_givefeedback (LPDROPSOURCE This,
DWORD dwEffect)
{
source_drag_context *ctx = (source_drag_context *) This;
GdkWin32DnDThreadGiveFeedback *feedback;
GDK_NOTE (DND, g_print ("idropsource_givefeedback %p with drop effect %lu S_OK\n", This, dwEffect));
if (!dnd_queue_is_empty ())
process_dnd_queue (FALSE, 0, NULL);
feedback = g_new0 (GdkWin32DnDThreadGiveFeedback, 1);
feedback->base.item_type = GDK_WIN32_DND_THREAD_QUEUE_ITEM_GIVE_FEEDBACK;
feedback->base.opaque_context = ctx->drag;
feedback->received_drop_effect = dwEffect;
g_idle_add_full (G_PRIORITY_DEFAULT, give_feedback, feedback, NULL);
GDK_NOTE (DND, g_print ("idropsource_givefeedback %p returns\n", This));
return S_OK;
}
static ULONG STDMETHODCALLTYPE
idataobject_addref (LPDATAOBJECT This)
{
data_object *dobj = (data_object *) This;
int ref_count = ++dobj->ref_count;
GDK_NOTE (DND, g_print ("idataobject_addref %p %d\n", This, ref_count));
return ref_count;
}
static HRESULT STDMETHODCALLTYPE
idataobject_queryinterface (LPDATAOBJECT This,
REFIID riid,
LPVOID *ppvObject)
{
GDK_NOTE (DND, {
g_print ("idataobject_queryinterface %p ", This);
PRINT_GUID (riid);
});
*ppvObject = NULL;
if (IsEqualGUID (riid, &IID_IUnknown))
{
GDK_NOTE (DND, g_print ("...IUnknown S_OK\n"));
idataobject_addref (This);
*ppvObject = This;
return S_OK;
}
else if (IsEqualGUID (riid, &IID_IDataObject))
{
GDK_NOTE (DND, g_print ("...IDataObject S_OK\n"));
idataobject_addref (This);
*ppvObject = This;
return S_OK;
}
else
{
GDK_NOTE (DND, g_print ("...E_NOINTERFACE\n"));
return E_NOINTERFACE;
}
}
static ULONG STDMETHODCALLTYPE
idataobject_release (LPDATAOBJECT This)
{
data_object *dobj = (data_object *) This;
int ref_count = --dobj->ref_count;
GDK_NOTE (DND, g_print ("idataobject_release %p %d\n", This, ref_count));
if (ref_count == 0)
{
g_array_free (dobj->formats, TRUE);
g_free (This);
}
return ref_count;
}
static HRESULT
query (LPDATAOBJECT This,
LPFORMATETC pFormatEtc,
GdkWin32ContentFormatPair **pair)
{
data_object *ctx = (data_object *) This;
int i;
if (pair)
*pair = NULL;
if (!pFormatEtc)
return DV_E_FORMATETC;
if (pFormatEtc->lindex != -1)
return DV_E_LINDEX;
if ((pFormatEtc->tymed & TYMED_HGLOBAL) == 0)
return DV_E_TYMED;
if ((pFormatEtc->dwAspect & DVASPECT_CONTENT) == 0)
return DV_E_DVASPECT;
for (i = 0; i < ctx->formats->len; i++)
{
GdkWin32ContentFormatPair *p = &g_array_index (ctx->formats, GdkWin32ContentFormatPair, i);
if (pFormatEtc->cfFormat == p->w32format)
{
if (pair)
*pair = p;
return S_OK;
}
}
return DV_E_FORMATETC;
}
static HRESULT STDMETHODCALLTYPE
idataobject_getdata (LPDATAOBJECT This,
LPFORMATETC pFormatEtc,
LPSTGMEDIUM pMedium)
{
data_object *ctx = (data_object *) This;
HRESULT hr;
GdkWin32DnDThreadGetData *getdata;
GdkWin32ContentFormatPair *pair;
if (ctx->drag == NULL)
return E_FAIL;
GDK_NOTE (DND, g_print ("idataobject_getdata %p %s ",
This, _gdk_win32_cf_to_string (pFormatEtc->cfFormat)));
/* Check whether we can provide requested format */
hr = query (This, pFormatEtc, &pair);
if (hr != S_OK)
{
GDK_NOTE (DND, g_print ("Unsupported format, returning 0x%lx\n", hr));
return hr;
}
if (!dnd_queue_is_empty ())
process_dnd_queue (FALSE, 0, NULL);
getdata = g_new0 (GdkWin32DnDThreadGetData, 1);
getdata->base.item_type = GDK_WIN32_DND_THREAD_QUEUE_ITEM_GET_DATA;
getdata->base.opaque_context = (gpointer) ctx->drag;
getdata->pair = *pair;
g_idle_add_full (G_PRIORITY_DEFAULT, get_data_response, getdata, NULL);
if (!process_dnd_queue (TRUE, g_get_monotonic_time () + G_USEC_PER_SEC * 30, getdata))
return E_FAIL;
if (getdata->produced_data_medium.tymed == TYMED_NULL)
{
free_queue_item (&getdata->base);
return E_FAIL;
}
memcpy (pMedium, &getdata->produced_data_medium, sizeof (*pMedium));
/* To ensure that the data isn't freed */
getdata->produced_data_medium.tymed = TYMED_NULL;
free_queue_item (&getdata->base);
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
idataobject_getdatahere (LPDATAOBJECT This,
LPFORMATETC pFormatEtc,
LPSTGMEDIUM pMedium)
{
GDK_NOTE (DND, g_print ("idataobject_getdatahere %p E_NOTIMPL\n", This));
return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
idataobject_querygetdata (LPDATAOBJECT This,
LPFORMATETC pFormatEtc)
{
HRESULT hr;
g_assert (_win32_main_thread == NULL ||
_win32_main_thread != g_thread_self ());
hr = query (This, pFormatEtc, NULL);
GDK_NOTE (DND,
g_print ("idataobject_querygetdata %p 0x%08x fmt, %p ptd, %lu aspect, %ld lindex, %0lx tymed - %s, return %#lx (%s)\n",
This, pFormatEtc->cfFormat, pFormatEtc->ptd, pFormatEtc->dwAspect, pFormatEtc->lindex, pFormatEtc->tymed, _gdk_win32_cf_to_string (pFormatEtc->cfFormat),
hr, (hr == S_OK) ? "S_OK" : (hr == DV_E_FORMATETC) ? "DV_E_FORMATETC" : (hr == DV_E_LINDEX) ? "DV_E_LINDEX" : (hr == DV_E_TYMED) ? "DV_E_TYMED" : (hr == DV_E_DVASPECT) ? "DV_E_DVASPECT" : "unknown meaning"));
return hr;
}
static HRESULT STDMETHODCALLTYPE
idataobject_getcanonicalformatetc (LPDATAOBJECT This,
LPFORMATETC pFormatEtcIn,
LPFORMATETC pFormatEtcOut)
{
GDK_NOTE (DND, g_print ("idataobject_getcanonicalformatetc %p E_NOTIMPL\n", This));
return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
idataobject_setdata (LPDATAOBJECT This,
LPFORMATETC pFormatEtc,
LPSTGMEDIUM pMedium,
BOOL fRelease)
{
GDK_NOTE (DND, g_print ("idataobject_setdata %p %s E_NOTIMPL\n",
This, _gdk_win32_cf_to_string (pFormatEtc->cfFormat)));
return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
idataobject_enumformatetc (LPDATAOBJECT This,
DWORD dwDirection,
LPENUMFORMATETC *ppEnumFormatEtc)
{
g_assert (_win32_main_thread == NULL ||
_win32_main_thread != g_thread_self ());
if (dwDirection != DATADIR_GET)
{
GDK_NOTE (DND, g_print ("idataobject_enumformatetc %p E_NOTIMPL", This));
return E_NOTIMPL;
}
*ppEnumFormatEtc = &enum_formats_new (((data_object *) This)->formats)->ief;
GDK_NOTE (DND, g_print ("idataobject_enumformatetc %p -> %p S_OK", This, *ppEnumFormatEtc));
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
idataobject_dadvise (LPDATAOBJECT This,
LPFORMATETC pFormatetc,
DWORD advf,
LPADVISESINK pAdvSink,
DWORD *pdwConnection)
{
GDK_NOTE (DND, g_print ("idataobject_dadvise %p E_NOTIMPL\n", This));
return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
idataobject_dunadvise (LPDATAOBJECT This,
DWORD dwConnection)
{
GDK_NOTE (DND, g_print ("idataobject_dunadvise %p E_NOTIMPL\n", This));
return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
idataobject_enumdadvise (LPDATAOBJECT This,
LPENUMSTATDATA *ppenumAdvise)
{
GDK_NOTE (DND, g_print ("idataobject_enumdadvise %p OLE_E_ADVISENOTSUPPORTED\n", This));
return OLE_E_ADVISENOTSUPPORTED;
}
static ULONG STDMETHODCALLTYPE
ienumformatetc_addref (LPENUMFORMATETC This)
{
enum_formats *en = (enum_formats *) This;
int ref_count = ++en->ref_count;
GDK_NOTE (DND, g_print ("ienumformatetc_addref %p %d\n", This, ref_count));
return ref_count;
}
static HRESULT STDMETHODCALLTYPE
ienumformatetc_queryinterface (LPENUMFORMATETC This,
REFIID riid,
LPVOID *ppvObject)
{
GDK_NOTE (DND, {
g_print ("ienumformatetc_queryinterface %p", This);
PRINT_GUID (riid);
});
*ppvObject = NULL;
if (IsEqualGUID (riid, &IID_IUnknown))
{
GDK_NOTE (DND, g_print ("...IUnknown S_OK\n"));
ienumformatetc_addref (This);
*ppvObject = This;
return S_OK;
}
else if (IsEqualGUID (riid, &IID_IEnumFORMATETC))
{
GDK_NOTE (DND, g_print ("...IEnumFORMATETC S_OK\n"));
ienumformatetc_addref (This);
*ppvObject = This;
return S_OK;
}
else
{
GDK_NOTE (DND, g_print ("...E_NOINTERFACE\n"));
return E_NOINTERFACE;
}
}
static ULONG STDMETHODCALLTYPE
ienumformatetc_release (LPENUMFORMATETC This)
{
enum_formats *en = (enum_formats *) This;
int ref_count = --en->ref_count;
GDK_NOTE (DND, g_print ("ienumformatetc_release %p %d\n", This, ref_count));
if (ref_count == 0)
{
g_array_unref (en->formats);
g_free (This);
}
return ref_count;
}
static HRESULT STDMETHODCALLTYPE
ienumformatetc_next (LPENUMFORMATETC This,
ULONG celt,
LPFORMATETC elts,
ULONG *nelt)
{
enum_formats *en = (enum_formats *) This;
ULONG i, n;
ULONG formats_to_get = celt;
GDK_NOTE (DND, g_print ("ienumformatetc_next %p %d %ld ", This, en->ix, celt));
n = 0;
for (i = 0; i < formats_to_get; i++)
{
UINT fmt;
if (en->ix >= en->formats->len)
break;
fmt = g_array_index (en->formats, GdkWin32ContentFormatPair, en->ix++).w32format;
/* skip internals */
if (fmt == 0 || fmt > 0xFFFF)
{
formats_to_get += 1;
continue;
}
elts[n].cfFormat = fmt;
elts[n].ptd = NULL;
elts[n].dwAspect = DVASPECT_CONTENT;
elts[n].lindex = -1;
elts[n].tymed = TYMED_HGLOBAL;
n++;
}
if (nelt != NULL)
*nelt = n;
GDK_NOTE (DND, g_print ("%s\n", (n == celt) ? "S_OK" : "S_FALSE"));
if (n == celt)
return S_OK;
else
return S_FALSE;
}
static HRESULT STDMETHODCALLTYPE
ienumformatetc_skip (LPENUMFORMATETC This,
ULONG celt)
{
enum_formats *en = (enum_formats *) This;
GDK_NOTE (DND, g_print ("ienumformatetc_skip %p %d %ld S_OK\n", This, en->ix, celt));
en->ix += celt;
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
ienumformatetc_reset (LPENUMFORMATETC This)
{
enum_formats *en = (enum_formats *) This;
GDK_NOTE (DND, g_print ("ienumformatetc_reset %p S_OK\n", This));
en->ix = 0;
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
ienumformatetc_clone (LPENUMFORMATETC This,
LPENUMFORMATETC *ppEnumFormatEtc)
{
enum_formats *en = (enum_formats *) This;
enum_formats *new;
GDK_NOTE (DND, g_print ("ienumformatetc_clone %p S_OK\n", This));
new = enum_formats_new (en->formats);
new->ix = en->ix;
*ppEnumFormatEtc = &new->ief;
return S_OK;
}
static IDropSourceVtbl ids_vtbl = {
idropsource_queryinterface,
idropsource_addref,
idropsource_release,
idropsource_querycontinuedrag,
idropsource_givefeedback
};
static IDropSourceNotifyVtbl idsn_vtbl = {
(HRESULT (STDMETHODCALLTYPE *) (IDropSourceNotify *, REFIID , LPVOID *)) idropsource_queryinterface,
(ULONG (STDMETHODCALLTYPE *) (IDropSourceNotify *)) idropsource_addref,
(ULONG (STDMETHODCALLTYPE *) (IDropSourceNotify *)) idropsource_release,
idropsourcenotify_dragentertarget,
idropsourcenotify_dragleavetarget
};
static IDataObjectVtbl ido_vtbl = {
idataobject_queryinterface,
idataobject_addref,
idataobject_release,
idataobject_getdata,
idataobject_getdatahere,
idataobject_querygetdata,
idataobject_getcanonicalformatetc,
idataobject_setdata,
idataobject_enumformatetc,
idataobject_dadvise,
idataobject_dunadvise,
idataobject_enumdadvise
};
static IEnumFORMATETCVtbl ief_vtbl = {
ienumformatetc_queryinterface,
ienumformatetc_addref,
ienumformatetc_release,
ienumformatetc_next,
ienumformatetc_skip,
ienumformatetc_reset,
ienumformatetc_clone
};
static source_drag_context *
source_context_new (GdkDrag *drag,
GdkContentFormats *formats)
{
GdkWin32Drag *drag_win32;
source_drag_context *result;
GdkSurface *surface;
drag_win32 = GDK_WIN32_DRAG (drag);
g_object_get (drag, "surface", &surface, NULL);
result = g_new0 (source_drag_context, 1);
result->drag = g_object_ref (drag);
result->ids.lpVtbl = &ids_vtbl;
result->idsn.lpVtbl = &idsn_vtbl;
result->ref_count = 1;
result->source_window_handle = GDK_SURFACE_HWND (surface);
result->scale = drag_win32->scale;
result->util_data.state = GDK_WIN32_DND_PENDING; /* Implicit */
result->dest_window_handle = INVALID_HANDLE_VALUE;
g_object_unref (surface);
GDK_NOTE (DND, g_print ("source_context_new: %p (drag %p)\n", result, result->drag));
return result;
}
static data_object *
data_object_new (GdkDrag *drag)
{
data_object *result;
const char * const *mime_types;
gsize n_mime_types, i;
result = g_new0 (data_object, 1);
result->ido.lpVtbl = &ido_vtbl;
result->ref_count = 1;
result->drag = drag;
result->formats = g_array_new (FALSE, FALSE, sizeof (GdkWin32ContentFormatPair));
mime_types = gdk_content_formats_get_mime_types (gdk_drag_get_formats (drag), &n_mime_types);
for (i = 0; i < n_mime_types; i++)
{
int added_count = 0;
int j;
GDK_NOTE (DND, g_print ("DataObject supports contentformat 0x%p (%s)\n", mime_types[i], mime_types[i]));
added_count = _gdk_win32_add_contentformat_to_pairs (mime_types[i], result->formats);
for (j = 0; j < added_count && result->formats->len - 1 - j >= 0; j++)
GDK_NOTE (DND, g_print ("DataObject will support w32format 0x%x\n", g_array_index (result->formats, GdkWin32ContentFormatPair, j).w32format));
}
GDK_NOTE (DND, g_print ("data_object_new: %p\n", result));
return result;
}
static enum_formats *
enum_formats_new (GArray *formats)
{
enum_formats *result;
result = g_new0 (enum_formats, 1);
result->ief.lpVtbl = &ief_vtbl;
result->ref_count = 1;
result->ix = 0;
result->formats = g_array_ref (formats);
return result;
}
void
_gdk_drag_init (void)
{
HRESULT hr;
CoInitializeEx (NULL, COINIT_APARTMENTTHREADED);
hr = OleInitialize (NULL);
if (! SUCCEEDED (hr))
g_error ("OleInitialize failed");
}
void
_gdk_win32_dnd_exit (void)
{
OleUninitialize ();
CoUninitialize ();
}
static GdkSurface *
create_drag_surface (GdkDisplay *display)
{
GdkSurface *surface;
surface = _gdk_win32_display_create_surface (display,
GDK_SURFACE_TEMP,
NULL,
0, 0, 100, 100);
return surface;
}
GdkDrag *
_gdk_win32_surface_drag_begin (GdkSurface *surface,
GdkDevice *device,
GdkContentProvider *content,
GdkDragAction actions,
double dx,
double dy)
{
GdkDrag *drag;
GdkWin32Drag *drag_win32;
GdkWin32Clipdrop *clipdrop = _gdk_win32_clipdrop_get ();
double px, py;
int x_root, y_root;
GdkWin32DnDThreadDoDragDrop *ddd;
source_drag_context *source_ctx;
data_object *data_obj;
g_return_val_if_fail (surface != NULL, NULL);
drag = gdk_drag_new (gdk_surface_get_display (surface),
surface,
content,
actions,
device);
drag_win32 = GDK_WIN32_DRAG (drag);
GDK_NOTE (DND, g_print ("_gdk_win32_surface_drag_begin\n"));
_gdk_device_win32_query_state (device, NULL, NULL, &px, &py, NULL);
x_root = round (px + dx);
y_root = round (py + dy);
drag_win32->start_x = x_root;
drag_win32->start_y = y_root;
drag_win32->util_data.last_x = drag_win32->start_x;
drag_win32->util_data.last_y = drag_win32->start_y;
g_set_object (&drag_win32->grab_surface, surface);
drag_win32->drag_surface = create_drag_surface (gdk_surface_get_display (surface));
if (!drag_context_grab (drag))
{
g_object_unref (drag);
return FALSE;
}
ddd = g_new0 (GdkWin32DnDThreadDoDragDrop, 1);
source_ctx = source_context_new (drag, gdk_drag_get_formats (drag));
data_obj = data_object_new (drag);
ddd->base.item_type = GDK_WIN32_DND_THREAD_QUEUE_ITEM_DO_DRAG_DROP;
ddd->base.opaque_context = drag_win32;
ddd->src_context = source_ctx;
ddd->src_object = data_obj;
ddd->allowed_drop_effects = 0;
if (actions & GDK_ACTION_COPY)
ddd->allowed_drop_effects |= DROPEFFECT_COPY;
if (actions & GDK_ACTION_MOVE)
ddd->allowed_drop_effects |= DROPEFFECT_MOVE;
if (actions & GDK_ACTION_LINK)
ddd->allowed_drop_effects |= DROPEFFECT_LINK;
g_hash_table_replace (clipdrop->active_source_drags, g_object_ref (drag), ddd);
increment_dnd_queue_counter ();
g_async_queue_push (clipdrop->dnd_queue, ddd);
API_CALL (PostThreadMessage, (clipdrop->dnd_thread_id, thread_wakeup_message, 0, 0));
drag_win32->util_data.state = GDK_WIN32_DND_PENDING;
move_drag_surface (drag, x_root, y_root);
return drag;
}
static DWORD
manufacture_keystate_from_GMT (GdkModifierType state)
{
DWORD key_state = 0;
if (state & GDK_ALT_MASK)
key_state |= MK_ALT;
if (state & GDK_CONTROL_MASK)
key_state |= MK_CONTROL;
if (state & GDK_SHIFT_MASK)
key_state |= MK_SHIFT;
if (state & GDK_BUTTON1_MASK)
key_state |= MK_LBUTTON;
if (state & GDK_BUTTON2_MASK)
key_state |= MK_MBUTTON;
if (state & GDK_BUTTON3_MASK)
key_state |= MK_RBUTTON;
return key_state;
}
static void
send_source_state_update (GdkWin32Clipdrop *clipdrop,
GdkWin32Drag *drag_win32,
gpointer *ddd)
{
GdkWin32DnDThreadUpdateDragState *status = g_new0 (GdkWin32DnDThreadUpdateDragState, 1);
status->base.item_type = GDK_WIN32_DND_THREAD_QUEUE_ITEM_UPDATE_DRAG_STATE;
status->opaque_ddd = ddd;
status->produced_util_data = drag_win32->util_data;
increment_dnd_queue_counter ();
g_async_queue_push (clipdrop->dnd_queue, status);
API_CALL (PostThreadMessage, (clipdrop->dnd_thread_id, thread_wakeup_message, 0, 0));
}
static void
gdk_win32_drag_drop (GdkDrag *drag,
guint32 time_)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GdkWin32Clipdrop *clipdrop = _gdk_win32_clipdrop_get ();
gpointer ddd;
g_assert (_win32_main_thread == NULL ||
_win32_main_thread == g_thread_self ());
g_return_if_fail (drag != NULL);
GDK_NOTE (DND, g_print ("gdk_win32_drag_drop\n"));
ddd = g_hash_table_lookup (clipdrop->active_source_drags, drag);
drag_win32->util_data.state = GDK_WIN32_DND_DROPPED;
if (ddd)
send_source_state_update (clipdrop, drag_win32, ddd);
}
static void
gdk_win32_drag_set_cursor (GdkDrag *drag,
GdkCursor *cursor)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GDK_NOTE (DND, g_print ("gdk_win32_drag_set_cursor: 0x%p 0x%p\n", drag, cursor));
if (!g_set_object (&drag_win32->cursor, cursor))
return;
if (drag_win32->grab_seat)
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
gdk_device_grab (gdk_seat_get_pointer (drag_win32->grab_seat),
drag_win32->grab_surface,
FALSE,
GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
cursor, GDK_CURRENT_TIME);
G_GNUC_END_IGNORE_DEPRECATIONS;
}
}
static double
ease_out_cubic (double t)
{
double p = t - 1;
return p * p * p + 1;
}
#define ANIM_TIME 500000 /* half a second */
typedef struct _GdkDragAnim GdkDragAnim;
struct _GdkDragAnim {
GdkWin32Drag *drag;
GdkFrameClock *frame_clock;
gint64 start_time;
};
static void
gdk_drag_anim_destroy (GdkDragAnim *anim)
{
g_object_unref (anim->drag);
g_slice_free (GdkDragAnim, anim);
}
static gboolean
gdk_drag_anim_timeout (gpointer data)
{
GdkDragAnim *anim = data;
GdkWin32Drag *drag = anim->drag;
GdkFrameClock *frame_clock = anim->frame_clock;
gint64 current_time;
double f;
double t;
int x, y;
if (!frame_clock)
return G_SOURCE_REMOVE;
current_time = gdk_frame_clock_get_frame_time (frame_clock);
f = (current_time - anim->start_time) / (double) ANIM_TIME;
if (f >= 1.0)
return G_SOURCE_REMOVE;
t = ease_out_cubic (f);
gdk_win32_surface_show (drag->drag_surface, FALSE);
x = (drag->util_data.last_x +
(drag->start_x - drag->util_data.last_x) * t -
drag->hot_x);
y = (drag->util_data.last_y +
(drag->start_y - drag->util_data.last_y) * t -
drag->hot_y);
gdk_win32_surface_move (drag->drag_surface, x, y);
return G_SOURCE_CONTINUE;
}
static void
gdk_win32_drag_drop_done (GdkDrag *drag,
gboolean success)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GdkDragAnim *anim;
GdkWin32Clipdrop *clipdrop;
gpointer ddd;
/*
cairo_surface_t *win_surface;
cairo_surface_t *surface;
cairo_t *cr;
*/
guint id;
GDK_NOTE (DND, g_print ("gdk_win32_drag_drop_done: 0x%p %s\n",
drag,
success ? "dropped successfully" : "dropped unsuccessfully"));
/* FIXME: This is temporary, until the code is fixed to ensure that
* gdk_drag_finish () is called by GTK.
*/
clipdrop = _gdk_win32_clipdrop_get ();
ddd = g_hash_table_lookup (clipdrop->active_source_drags, drag);
if (success)
drag_win32->util_data.state = GDK_WIN32_DND_DROPPED;
else
drag_win32->util_data.state = GDK_WIN32_DND_NONE;
if (ddd)
send_source_state_update (clipdrop, drag_win32, ddd);
drag_win32->handle_events = FALSE;
if (success)
{
gdk_surface_hide (drag_win32->drag_surface);
return;
}
/*
win_surface = _gdk_surface_ref_cairo_surface (drag_win32->drag_surface);
surface = gdk_surface_create_similar_surface (drag_win32->drag_surface,
cairo_surface_get_content (win_surface),
gdk_surface_get_width (drag_win32->drag_surface),
gdk_surface_get_height (drag_win32->drag_surface));
cr = cairo_create (surface);
cairo_set_source_surface (cr, win_surface, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (win_surface);
pattern = cairo_pattern_create_for_surface (surface);
gdk_surface_set_background_pattern (drag_win32->drag_surface, pattern);
cairo_pattern_destroy (pattern);
cairo_surface_destroy (surface);
*/
anim = g_slice_new0 (GdkDragAnim);
g_set_object (&anim->drag, drag_win32);
anim->frame_clock = gdk_surface_get_frame_clock (drag_win32->drag_surface);
anim->start_time = gdk_frame_clock_get_frame_time (anim->frame_clock);
GDK_NOTE (DND, g_print ("gdk_win32_drag_drop_done: animate the drag window from %d : %d to %d : %d\n",
drag_win32->util_data.last_x, drag_win32->util_data.last_y,
drag_win32->start_x, drag_win32->start_y));
id = g_timeout_add_full (G_PRIORITY_DEFAULT, 17,
gdk_drag_anim_timeout, anim,
(GDestroyNotify) gdk_drag_anim_destroy);
gdk_source_set_static_name_by_id (id, "[gtk] gdk_drag_anim_timeout");
}
static gboolean
drag_context_grab (GdkDrag *drag)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GdkSeatCapabilities capabilities;
GdkSeat *seat;
GdkCursor *cursor;
GDK_NOTE (DND, g_print ("drag_context_grab: 0x%p with grab surface 0x%p\n",
drag,
drag_win32->grab_surface));
if (!drag_win32->grab_surface)
return FALSE;
seat = gdk_device_get_seat (gdk_drag_get_device (drag));
capabilities = GDK_SEAT_CAPABILITY_ALL;
cursor = gdk_drag_get_cursor (drag, gdk_drag_get_selected_action (drag));
g_set_object (&drag_win32->cursor, cursor);
if (gdk_seat_grab (seat, drag_win32->grab_surface,
capabilities, FALSE,
drag_win32->cursor, NULL, NULL, NULL) != GDK_GRAB_SUCCESS)
return FALSE;
g_set_object (&drag_win32->grab_seat, seat);
/* TODO: Should be grabbing keys here, to support keynav. SetWindowsHookEx()? */
return TRUE;
}
static void
drag_context_ungrab (GdkDrag *drag)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GDK_NOTE (DND, g_print ("drag_context_ungrab: 0x%p 0x%p\n",
drag,
drag_win32->grab_seat));
if (!drag_win32->grab_seat)
return;
gdk_seat_ungrab (drag_win32->grab_seat);
g_clear_object (&drag_win32->grab_seat);
/* TODO: Should be ungrabbing keys here */
}
static void
gdk_win32_drag_cancel (GdkDrag *drag,
GdkDragCancelReason reason)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
const char *reason_str = NULL;
switch (reason)
{
case GDK_DRAG_CANCEL_NO_TARGET:
reason_str = "no target";
break;
case GDK_DRAG_CANCEL_USER_CANCELLED:
reason_str = "user cancelled";
break;
case GDK_DRAG_CANCEL_ERROR:
reason_str = "error";
break;
default:
reason_str = "<unknown>";
break;
}
GDK_NOTE (DND, g_print ("gdk_win32_drag_cancel: 0x%p %s\n",
drag,
reason_str));
gdk_drag_set_cursor (drag, NULL);
drag_context_ungrab (drag);
gdk_drag_drop_done (drag, FALSE);
}
static void
gdk_win32_drag_drop_performed (GdkDrag *drag,
guint32 time_)
{
GDK_NOTE (DND, g_print ("gdk_win32_drag_drop_performed: 0x%p %u\n",
drag,
time_));
gdk_win32_drag_drop (drag, time_);
gdk_drag_set_cursor (drag, NULL);
drag_context_ungrab (drag);
}
#define BIG_STEP 20
#define SMALL_STEP 1
static gboolean
gdk_dnd_handle_motion_event (GdkDrag *drag,
GdkEvent *event)
{
GdkModifierType state;
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
DWORD key_state;
double x, y;
double x_root, y_root;
GdkWin32Clipdrop *clipdrop;
GDK_NOTE (DND, g_print ("gdk_dnd_handle_motion_event: 0x%p\n", drag));
state = gdk_event_get_modifier_state (event);
gdk_event_get_position (event, &x, &y);
x_root = event->surface->x + x;
y_root = event->surface->y + y;
if (drag_win32->drag_surface)
move_drag_surface (drag, x_root, y_root);
key_state = manufacture_keystate_from_GMT (state);
clipdrop = _gdk_win32_clipdrop_get ();
GDK_NOTE (DND, g_print ("Post WM_MOUSEMOVE keystate=%lu\n", key_state));
drag_win32->util_data.last_x = x_root;
drag_win32->util_data.last_y = y_root;
API_CALL (PostThreadMessage, (clipdrop->dnd_thread_id,
WM_MOUSEMOVE,
key_state,
MAKELPARAM (x * drag_win32->scale,
y * drag_win32->scale)));
return TRUE;
}
static gboolean
gdk_dnd_handle_key_event (GdkDrag *drag,
GdkEvent *event)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GdkModifierType state;
GdkDevice *pointer;
GdkSeat *seat;
int dx, dy;
GDK_NOTE (DND, g_print ("gdk_dnd_handle_key_event: 0x%p\n", drag));
state = gdk_event_get_modifier_state (event);
dx = dy = 0;
seat = gdk_event_get_seat (event);
pointer = gdk_seat_get_pointer (seat);
if (gdk_event_get_event_type (event) == GDK_KEY_PRESS)
{
switch (gdk_key_event_get_keyval (event))
{
case GDK_KEY_Escape:
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_USER_CANCELLED);
return TRUE;
case GDK_KEY_space:
case GDK_KEY_Return:
case GDK_KEY_ISO_Enter:
case GDK_KEY_KP_Enter:
case GDK_KEY_KP_Space:
if ((gdk_drag_get_selected_action (drag) != 0) &&
(drag_win32->dest_window != INVALID_HANDLE_VALUE))
{
g_signal_emit_by_name (drag, "drop-performed");
}
else
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_NO_TARGET);
return TRUE;
case GDK_KEY_Up:
case GDK_KEY_KP_Up:
dy = (state & GDK_ALT_MASK) ? -BIG_STEP : -SMALL_STEP;
break;
case GDK_KEY_Down:
case GDK_KEY_KP_Down:
dy = (state & GDK_ALT_MASK) ? BIG_STEP : SMALL_STEP;
break;
case GDK_KEY_Left:
case GDK_KEY_KP_Left:
dx = (state & GDK_ALT_MASK) ? -BIG_STEP : -SMALL_STEP;
break;
case GDK_KEY_Right:
case GDK_KEY_KP_Right:
dx = (state & GDK_ALT_MASK) ? BIG_STEP : SMALL_STEP;
break;
}
}
/* The state is not yet updated in the event, so we need
* to query it here.
*/
_gdk_device_win32_query_state (pointer, NULL, NULL, NULL, NULL, &state);
if (dx != 0 || dy != 0)
{
drag_win32->util_data.last_x += dx;
drag_win32->util_data.last_y += dy;
}
if (drag_win32->drag_surface)
move_drag_surface (drag, drag_win32->util_data.last_x, drag_win32->util_data.last_y);
return TRUE;
}
static gboolean
gdk_dnd_handle_grab_broken_event (GdkDrag *drag,
GdkEvent *event)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GDK_NOTE (DND, g_print ("gdk_dnd_handle_grab_broken_event: 0x%p\n", drag));
/* Don't cancel if we break the implicit grab from the initial button_press.
* Also, don't cancel if we re-grab on the widget or on our grab window, for
* example, when changing the drag cursor.
*/
if (/* FIXME: event->implicit || */
gdk_grab_broken_event_get_grab_surface (event) == drag_win32->drag_surface ||
gdk_grab_broken_event_get_grab_surface (event) == drag_win32->grab_surface)
return FALSE;
if (gdk_event_get_device (event) != gdk_drag_get_device (drag))
return FALSE;
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_ERROR);
return TRUE;
}
static gboolean
gdk_dnd_handle_button_event (GdkDrag *drag,
GdkEvent *event)
{
GDK_NOTE (DND, g_print ("gdk_dnd_handle_button_event: 0x%p\n", drag));
#if 0
/* FIXME: Check the button matches */
if (event->button != drag_win32->button)
return FALSE;
#endif
if ((gdk_drag_get_selected_action (drag) != 0))
{
g_signal_emit_by_name (drag, "drop-performed");
}
else
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_NO_TARGET);
/* Make sure GTK gets mouse release button event */
return FALSE;
}
gboolean
gdk_win32_drag_handle_event (GdkDrag *drag,
GdkEvent *event)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
if (!drag_win32->grab_seat)
return FALSE;
if (!drag_win32->handle_events)
{
/* FIXME: remove this functionality once gtk no longer calls DnD after drag_done() */
g_warning ("Got an event %d for drag context %p, even though it's done!",
event->event_type, drag);
return FALSE;
}
switch (gdk_event_get_event_type (event))
{
case GDK_MOTION_NOTIFY:
return gdk_dnd_handle_motion_event (drag, event);
case GDK_BUTTON_RELEASE:
return gdk_dnd_handle_button_event (drag, event);
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
return gdk_dnd_handle_key_event (drag, event);
case GDK_GRAB_BROKEN:
return gdk_dnd_handle_grab_broken_event (drag, event);
default:
break;
}
return FALSE;
}
static GdkSurface *
gdk_win32_drag_get_drag_surface (GdkDrag *drag)
{
return GDK_WIN32_DRAG (drag)->drag_surface;
}
static void
gdk_win32_drag_set_hotspot (GdkDrag *drag,
int hot_x,
int hot_y)
{
GdkWin32Drag *drag_win32 = GDK_WIN32_DRAG (drag);
GDK_NOTE (DND, g_print ("gdk_drag_set_hotspot: 0x%p %d:%d\n",
drag,
hot_x, hot_y));
drag_win32->hot_x = hot_x;
drag_win32->hot_y = hot_y;
if (drag_win32->grab_seat)
{
/* DnD is managed, update current position */
move_drag_surface (drag, drag_win32->util_data.last_x, drag_win32->util_data.last_y);
}
}
static void
gdk_win32_drag_class_init (GdkWin32DragClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GdkDragClass *drag_class = GDK_DRAG_CLASS (klass);
object_class->finalize = gdk_win32_drag_finalize;
drag_class->get_drag_surface = gdk_win32_drag_get_drag_surface;
drag_class->set_hotspot = gdk_win32_drag_set_hotspot;
drag_class->drop_done = gdk_win32_drag_drop_done;
drag_class->set_cursor = gdk_win32_drag_set_cursor;
drag_class->cancel = gdk_win32_drag_cancel;
drag_class->drop_performed = gdk_win32_drag_drop_performed;
drag_class->handle_event = gdk_win32_drag_handle_event;
}
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