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gtk2/gdk/win32/gdkdnd-win32.c
Tor Lillqvist 638ebcee70 re-adding for manual rename of repository files.
1999-11-11 22:12:27 +00:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
* Copyright (C) 1998-1999 Tor Lillqvist
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-1999. 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>
/* #define OLE2_DND */
#define INITGUID
#include "gdkdnd.h"
#include "gdkproperty.h"
#include "gdkprivate.h"
#include "gdkx.h"
#ifdef OLE2_DND
#include <ole2.h>
#else
#include <objbase.h>
#endif
#ifdef _MSC_VER /* These aren't in mingw32 */
#include <shlobj.h>
#include <shlguid.h>
#endif
#ifndef _MSC_VER
static IID IID_IUnknown = {
0x00000000, 0x0000, 0x0000, { 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46 } };
static IID IID_IDropSource = {
0x00000121, 0x0000, 0x0000, { 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46 } };
static IID IID_IDropTarget = {
0x00000122, 0x0000, 0x0000, { 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46 } };
#endif
#include <gdk/gdk.h>
typedef struct _GdkDragContextPrivate GdkDragContextPrivate;
typedef enum {
GDK_DRAG_STATUS_DRAG,
GDK_DRAG_STATUS_MOTION_WAIT,
GDK_DRAG_STATUS_ACTION_WAIT,
GDK_DRAG_STATUS_DROP
} GtkDragStatus;
typedef enum {
GDK_DRAG_SOURCE,
GDK_DRAG_TARGET
} GdkDragKind;
#ifdef OLE2_DND
#define PRINT_GUID(guid) \
g_print ("guid = %.08x-%.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]);
#endif /* OLE2_DND */
/* Structure that holds information about a drag in progress.
* this is used on both source and destination sides.
*/
struct _GdkDragContextPrivate {
GdkDragContext context;
guint ref_count;
guint16 last_x; /* Coordinates from last event */
guint16 last_y;
HWND dest_xid;
guint drag_status; /* Current status of drag */
};
GdkDragContext *current_dest_drag = NULL;
/* Drag Contexts */
static GList *contexts;
GdkDragContext *
gdk_drag_context_new (void)
{
GdkDragContextPrivate *result;
result = g_new0 (GdkDragContextPrivate, 1);
result->ref_count = 1;
contexts = g_list_prepend (contexts, result);
return (GdkDragContext *)result;
}
void
gdk_drag_context_ref (GdkDragContext *context)
{
g_return_if_fail (context != NULL);
((GdkDragContextPrivate *)context)->ref_count++;
}
void
gdk_drag_context_unref (GdkDragContext *context)
{
GdkDragContextPrivate *private = (GdkDragContextPrivate *)context;
g_return_if_fail (context != NULL);
private->ref_count--;
GDK_NOTE (DND, g_print ("gdk_drag_context_unref: %d%s\n",
private->ref_count,
(private->ref_count == 0 ? " freeing" : "")));
if (private->ref_count == 0)
{
g_dataset_destroy (private);
g_list_free (context->targets);
if (context->source_window)
gdk_window_unref (context->source_window);
if (context->dest_window)
gdk_window_unref (context->dest_window);
contexts = g_list_remove (contexts, private);
g_free (private);
}
}
#if 0
static GdkDragContext *
gdk_drag_context_find (gboolean is_source,
HWND source_xid,
HWND dest_xid)
{
GList *tmp_list = contexts;
GdkDragContext *context;
while (tmp_list)
{
context = (GdkDragContext *)tmp_list->data;
if ((!context->is_source == !is_source) &&
((source_xid == None) || (context->source_window &&
(GDK_WINDOW_XWINDOW (context->source_window) == source_xid))) &&
((dest_xid == None) || (context->dest_window &&
(GDK_WINDOW_XWINDOW (context->dest_window) == dest_xid))))
return context;
tmp_list = tmp_list->next;
}
return NULL;
}
#endif
typedef struct {
#ifdef OLE2_DND
IDropTarget idt;
#endif
GdkDragContext *context;
} target_drag_context;
typedef struct {
#ifdef OLE2_DND
IDropSource ids;
#endif
GdkDragContext *context;
} source_drag_context;
#ifdef OLE2_DND
static ULONG STDMETHODCALLTYPE
m_add_ref_target (IDropTarget __RPC_FAR *This)
{
target_drag_context *ctx = (target_drag_context *) This;
GdkDragContextPrivate *private = (GdkDragContextPrivate *) ctx->context;
GDK_NOTE (DND, g_print ("m_add_ref_target\n"));
gdk_drag_context_ref (ctx->context);
return private->ref_count;
}
static HRESULT STDMETHODCALLTYPE
m_query_interface_target (IDropTarget __RPC_FAR *This,
REFIID riid,
void __RPC_FAR *__RPC_FAR *ppvObject)
{
GDK_NOTE (DND, g_print ("m_query_interface_target\n"));
*ppvObject = NULL;
PRINT_GUID (riid);
if (IsEqualGUID (riid, &IID_IUnknown))
{
g_print ("...IUnknown\n");
m_add_ref_target (This);
*ppvObject = This;
return S_OK;
}
else if (IsEqualGUID (riid, &IID_IDropTarget))
{
g_print ("...IDropTarget\n");
m_add_ref_target (This);
*ppvObject = This;
return S_OK;
}
else
{
g_print ("...Huh?\n");
return E_NOINTERFACE;
}
}
static ULONG STDMETHODCALLTYPE
m_release_target (IDropTarget __RPC_FAR *This)
{
target_drag_context *ctx = (target_drag_context *) This;
GdkDragContextPrivate *private = (GdkDragContextPrivate *) ctx->context;
GDK_NOTE (DND, g_print ("m_release_target\n"));
gdk_drag_context_unref (ctx->context);
if (private->ref_count == 1)
{
gdk_drag_context_unref (ctx->context);
return 0;
}
else
return private->ref_count - 1;
}
static HRESULT STDMETHODCALLTYPE
m_drag_enter (IDropTarget __RPC_FAR *This,
IDataObject __RPC_FAR *pDataObj,
DWORD grfKeyState,
POINTL pt,
DWORD __RPC_FAR *pdwEffect)
{
GDK_NOTE (DND, g_print ("m_drag_enter\n"));
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_drag_over (IDropTarget __RPC_FAR *This,
DWORD grfKeyState,
POINTL pt,
DWORD __RPC_FAR *pdwEffect)
{
GDK_NOTE (DND, g_print ("m_drag_over\n"));
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_drag_leave (IDropTarget __RPC_FAR *This)
{
GDK_NOTE (DND, g_print ("m_drag_leave\n"));
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_drop (IDropTarget __RPC_FAR *This,
IDataObject __RPC_FAR *pDataObj,
DWORD grfKeyState,
POINTL pt,
DWORD __RPC_FAR *pdwEffect)
{
GDK_NOTE (DND, g_print ("m_drop\n"));
return E_UNEXPECTED;
}
static ULONG STDMETHODCALLTYPE
m_add_ref_source (IDropSource __RPC_FAR *This)
{
source_drag_context *ctx = (source_drag_context *) This;
GdkDragContextPrivate *private = (GdkDragContextPrivate *) ctx->context;
GDK_NOTE (DND, g_print ("m_add_ref_source\n"));
gdk_drag_context_ref (ctx->context);
return private->ref_count;
}
static HRESULT STDMETHODCALLTYPE
m_query_interface_source (IDropSource __RPC_FAR *This,
REFIID riid,
void __RPC_FAR *__RPC_FAR *ppvObject)
{
GDK_NOTE (DND, g_print ("m_query_interface_source\n"));
*ppvObject = NULL;
PRINT_GUID (riid);
if (IsEqualGUID (riid, &IID_IUnknown))
{
g_print ("...IUnknown\n");
m_add_ref_source (This);
*ppvObject = This;
return S_OK;
}
else if (IsEqualGUID (riid, &IID_IDropSource))
{
g_print ("...IDropSource\n");
m_add_ref_source (This);
*ppvObject = This;
return S_OK;
}
else
{
g_print ("...Huh?\n");
return E_NOINTERFACE;
}
}
static ULONG STDMETHODCALLTYPE
m_release_source (IDropSource __RPC_FAR *This)
{
source_drag_context *ctx = (source_drag_context *) This;
GdkDragContextPrivate *private = (GdkDragContextPrivate *) ctx->context;
GDK_NOTE (DND, g_print ("m_release_source\n"));
gdk_drag_context_unref (ctx->context);
if (private->ref_count == 1)
{
gdk_drag_context_unref (ctx->context);
return 0;
}
else
return private->ref_count - 1;
}
static HRESULT STDMETHODCALLTYPE
m_query_continue_drag (IDropSource __RPC_FAR *This,
BOOL fEscapePressed,
DWORD grfKeyState)
{
GDK_NOTE (DND, g_print ("m_query_continue_drag\n"));
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_give_feedback (IDropSource __RPC_FAR *This,
DWORD dwEffect)
{
GDK_NOTE (DND, g_print ("m_give_feedback\n"));
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_query_interface_object (IDataObject __RPC_FAR *This,
REFIID riid,
void __RPC_FAR *__RPC_FAR *ppvObject)
{
return E_UNEXPECTED;
}
static ULONG STDMETHODCALLTYPE
m_add_ref_object (IDataObject __RPC_FAR *This)
{
return E_UNEXPECTED;
}
static ULONG STDMETHODCALLTYPE
m_release_object (IDataObject __RPC_FAR *This)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_get_data (IDataObject __RPC_FAR *This,
FORMATETC *pFormatEtc,
STGMEDIUM *pMedium)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_get_data_here (IDataObject __RPC_FAR *This,
FORMATETC *pFormatEtc,
STGMEDIUM *pMedium)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_query_get_data (IDataObject __RPC_FAR *This,
FORMATETC *pFormatEtc)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_get_canonical_format_etc (IDataObject __RPC_FAR *This,
FORMATETC *pFormatEtcIn,
FORMATETC *pFormatEtcOut)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_set_data (IDataObject __RPC_FAR *This,
FORMATETC *pFormatEtc,
STGMEDIUM *pMedium,
BOOL fRelease)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_enum_format_etc (IDataObject __RPC_FAR *This,
DWORD dwDirection,
IEnumFORMATETC **ppEnumFormatEtc)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_d_advise (IDataObject __RPC_FAR *This,
FORMATETC *pFormatetc,
DWORD advf,
IAdviseSink *pAdvSink,
DWORD *pdwConnection)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_d_unadvise (IDataObject __RPC_FAR *This,
DWORD dwConnection)
{
return E_UNEXPECTED;
}
static HRESULT STDMETHODCALLTYPE
m_enum_d_advise (IDataObject __RPC_FAR *This,
IEnumSTATDATA **ppenumAdvise)
{
return E_UNEXPECTED;
}
static IDropTargetVtbl idt_vtbl = {
m_query_interface_target,
m_add_ref_target,
m_release_target,
m_drag_enter,
m_drag_over,
m_drag_leave,
m_drop
};
static IDropSourceVtbl ids_vtbl = {
m_query_interface_source,
m_add_ref_source,
m_release_source,
m_query_continue_drag,
m_give_feedback
};
static IDataObjectVtbl ido_vtbl = {
m_query_interface_object,
m_add_ref_object,
m_release_object,
m_get_data,
m_get_data_here,
m_query_get_data,
m_get_canonical_format_etc,
m_set_data,
m_enum_format_etc,
m_d_advise,
m_d_unadvise,
m_enum_d_advise
};
#endif /* OLE2_DND */
static target_drag_context *
target_context_new (void)
{
target_drag_context *result;
result = g_new0 (target_drag_context, 1);
#ifdef OLE2_DND
result->idt.lpVtbl = &idt_vtbl;
#endif
result->context = gdk_drag_context_new ();
return result;
}
static source_drag_context *
source_context_new (void)
{
source_drag_context *result;
result = g_new0 (source_drag_context, 1);
#ifdef OLE2_DND
result->ids.lpVtbl = &ids_vtbl;
#endif
result->context = gdk_drag_context_new ();
return result;
}
#ifdef _MSC_VER
/* From MS Knowledge Base article Q130698 */
/* resolve_link() fills the filename and path buffer
* with relevant information
* hWnd - calling app's window handle.
*
* lpszLinkName - name of the link file passed into the function.
*
* lpszPath - the buffer that will receive the file pathname.
*/
static HRESULT
resolve_link(HWND hWnd,
LPCTSTR lpszLinkName,
LPSTR lpszPath,
LPSTR lpszDescription)
{
HRESULT hres;
IShellLink *psl;
WIN32_FIND_DATA wfd;
/* Assume Failure to start with: */
*lpszPath = 0;
if (lpszDescription)
*lpszDescription = 0;
/* Call CoCreateInstance to obtain the IShellLink interface
* pointer. This call fails if CoInitialize is not called, so it is
* assumed that CoInitialize has been called.
*/
hres = CoCreateInstance (&CLSID_ShellLink,
NULL,
CLSCTX_INPROC_SERVER,
&IID_IShellLink,
(LPVOID *)&psl);
if (SUCCEEDED (hres))
{
IPersistFile *ppf;
/* The IShellLink interface supports the IPersistFile
* interface. Get an interface pointer to it.
*/
hres = psl->lpVtbl->QueryInterface (psl,
&IID_IPersistFile,
(LPVOID *) &ppf);
if (SUCCEEDED (hres))
{
WORD wsz[MAX_PATH];
/* Convert the given link name string to wide character string. */
MultiByteToWideChar (CP_ACP, 0,
lpszLinkName,
-1, wsz, MAX_PATH);
/* Load the file. */
hres = ppf->lpVtbl->Load (ppf, wsz, STGM_READ);
if (SUCCEEDED (hres))
{
/* Resolve the link by calling the Resolve()
* interface function.
*/
hres = psl->lpVtbl->Resolve(psl, hWnd,
SLR_ANY_MATCH |
SLR_NO_UI);
if (SUCCEEDED (hres))
{
hres = psl->lpVtbl->GetPath (psl, lpszPath,
MAX_PATH,
(WIN32_FIND_DATA*)&wfd,
0);
if (SUCCEEDED (hres) && lpszDescription != NULL)
{
hres = psl->lpVtbl->GetDescription (psl,
lpszDescription,
MAX_PATH );
if (!SUCCEEDED (hres))
return FALSE;
}
}
}
ppf->lpVtbl->Release (ppf);
}
psl->lpVtbl->Release (psl);
}
return SUCCEEDED (hres);
}
#else
#define resolve_link(hWnd, lpszLinkName, lpszPath, lpszDescription) FALSE
#endif
static GdkFilterReturn
gdk_dropfiles_filter (GdkXEvent *xev,
GdkEvent *event,
gpointer data)
{
GdkDragContext *context;
GdkDragContextPrivate *private;
static GdkAtom text_uri_list_atom = GDK_NONE;
GString *result;
MSG *msg = (MSG *) xev;
HANDLE hdrop;
POINT pt;
gint nfiles, i, k;
guchar fileName[MAX_PATH], linkedFile[MAX_PATH];
if (text_uri_list_atom == GDK_NONE)
text_uri_list_atom = gdk_atom_intern ("text/uri-list", FALSE);
if (msg->message == WM_DROPFILES)
{
GDK_NOTE (DND, g_print ("WM_DROPFILES: %#x\n", msg->hwnd));
context = gdk_drag_context_new ();
private = (GdkDragContextPrivate *) context;
context->protocol = GDK_DRAG_PROTO_WIN32_DROPFILES;
context->is_source = FALSE;
context->source_window = (GdkWindow *) gdk_root_parent;
context->dest_window = event->any.window;
gdk_window_ref (context->dest_window);
/* WM_DROPFILES drops are always file names */
context->targets =
g_list_append (NULL, GUINT_TO_POINTER (text_uri_list_atom));
current_dest_drag = context;
event->dnd.type = GDK_DROP_START;
event->dnd.context = current_dest_drag;
gdk_drag_context_ref (current_dest_drag);
hdrop = (HANDLE) msg->wParam;
DragQueryPoint (hdrop, &pt);
ClientToScreen (msg->hwnd, &pt);
event->dnd.x_root = pt.x;
event->dnd.y_root = pt.y;
event->dnd.time = msg->time;
nfiles = DragQueryFile (hdrop, 0xFFFFFFFF, NULL, 0);
result = g_string_new (NULL);
for (i = 0; i < nfiles; i++)
{
g_string_append (result, "file:");
DragQueryFile (hdrop, i, fileName, MAX_PATH);
/* Resolve shortcuts */
if (resolve_link (msg->hwnd, fileName, linkedFile, NULL))
{
g_string_append (result, linkedFile);
GDK_NOTE (DND, g_print ("...%s link to %s\n",
fileName, linkedFile));
}
else
{
g_string_append (result, fileName);
GDK_NOTE (DND, g_print ("...%s\n", fileName));
}
g_string_append (result, "\015\012");
}
gdk_sel_prop_store ((GdkWindow *) gdk_root_parent,
text_uri_list_atom, 8, result->str, result->len + 1);
DragFinish (hdrop);
return GDK_FILTER_TRANSLATE;
}
else
return GDK_FILTER_CONTINUE;
}
/*************************************************************
************************** Public API ***********************
*************************************************************/
void
gdk_dnd_init (void)
{
HRESULT hres;
#ifdef OLE2_DND
hres = OleInitialize (NULL);
if (! SUCCEEDED (hres))
g_error ("OleInitialize failed");
#endif
}
void
gdk_dnd_exit (void)
{
#ifdef OLE2_DND
OleUninitialize ();
#endif
}
/* Source side */
static void
gdk_drag_do_leave (GdkDragContext *context, guint32 time)
{
if (context->dest_window)
{
GDK_NOTE (DND, g_print ("gdk_drag_do_leave\n"));
gdk_window_unref (context->dest_window);
context->dest_window = NULL;
}
}
GdkDragContext *
gdk_drag_begin (GdkWindow *window,
GList *targets)
{
GList *tmp_list;
source_drag_context *ctx;
g_return_val_if_fail (window != NULL, NULL);
GDK_NOTE (DND, g_print ("gdk_drag_begin\n"));
ctx = source_context_new ();
ctx->context->is_source = TRUE;
ctx->context->source_window = window;
gdk_window_ref (window);
tmp_list = g_list_last (targets);
ctx->context->targets = NULL;
while (tmp_list)
{
ctx->context->targets = g_list_prepend (ctx->context->targets,
tmp_list->data);
tmp_list = tmp_list->prev;
}
ctx->context->actions = 0;
#if 0
DoDragDrop (...);
#endif
return ctx->context;
}
guint32
gdk_drag_get_protocol (guint32 xid,
GdkDragProtocol *protocol)
{
/* This isn't used */
return 0;
}
void
gdk_drag_find_window (GdkDragContext *context,
GdkWindow *drag_window,
gint x_root,
gint y_root,
GdkWindow **dest_window,
GdkDragProtocol *protocol)
{
GdkDragContextPrivate *private = (GdkDragContextPrivate *)context;
GdkDrawablePrivate *drag_window_private = (GdkDrawablePrivate*) drag_window;
HWND recipient;
POINT pt;
GDK_NOTE (DND, g_print ("gdk_drag_find_window: %#x +%d+%d\n",
(drag_window ? drag_window_private->xwindow : 0),
x_root, y_root));
pt.x = x_root;
pt.y = y_root;
recipient = WindowFromPoint (pt);
if (recipient == NULL)
*dest_window = NULL;
else
{
*dest_window = gdk_window_lookup (recipient);
if (*dest_window)
gdk_window_ref (*dest_window);
*protocol = GDK_DRAG_PROTO_WIN32_DROPFILES;
}
}
gboolean
gdk_drag_motion (GdkDragContext *context,
GdkWindow *dest_window,
GdkDragProtocol protocol,
gint x_root,
gint y_root,
GdkDragAction suggested_action,
GdkDragAction possible_actions,
guint32 time)
{
return FALSE;
}
void
gdk_drag_drop (GdkDragContext *context,
guint32 time)
{
g_return_if_fail (context != NULL);
g_warning ("gdk_drag_drop: not implemented\n");
}
void
gdk_drag_abort (GdkDragContext *context,
guint32 time)
{
g_return_if_fail (context != NULL);
gdk_drag_do_leave (context, time);
}
/* Destination side */
void
gdk_drag_status (GdkDragContext *context,
GdkDragAction action,
guint32 time)
{
GDK_NOTE (DND, g_print ("gdk_drag_status\n"));
}
void
gdk_drop_reply (GdkDragContext *context,
gboolean ok,
guint32 time)
{
}
void
gdk_drop_finish (GdkDragContext *context,
gboolean success,
guint32 time)
{
}
static GdkFilterReturn
gdk_destroy_filter (GdkXEvent *xev,
GdkEvent *event,
gpointer data)
{
#ifdef OLE2_DND
MSG *msg = (MSG *) xev;
if (msg->message == WM_DESTROY)
{
IDropTarget *idtp = (IDropTarget *) data;
GDK_NOTE (DND, g_print ("gdk_destroy_filter: WM_DESTROY: %#x\n", msg->hwnd));
RevokeDragDrop (msg->hwnd);
CoLockObjectExternal (idtp, FALSE, TRUE);
}
#endif
return GDK_FILTER_CONTINUE;
}
void
gdk_window_register_dnd (GdkWindow *window)
{
GdkDrawablePrivate *private = (GdkDrawablePrivate *) window;
#ifdef OLE2_DND
target_drag_context *context;
HRESULT hres;
#endif
g_return_if_fail (window != NULL);
GDK_NOTE (DND, g_print ("gdk_window_register_dnd: %#x\n", private->xwindow));
/* We always claim to accept dropped files, but in fact we might not,
* of course. This function is called in such a way that it cannot know
* whether the window (widget) in question actually accepts files
* (in gtk, data of type text/uri-list) or not.
*/
gdk_window_add_filter (window, gdk_dropfiles_filter, NULL);
DragAcceptFiles (private->xwindow, TRUE);
#ifdef OLE2_DND
/* Register for OLE2 d&d */
context = target_context_new ();
hres = CoLockObjectExternal ((IUnknown *) &context->idt, TRUE, FALSE);
if (!SUCCEEDED (hres))
g_warning ("gdk_window_register_dnd: CoLockObjectExternal failed");
else
{
hres = RegisterDragDrop (private->xwindow, &context->idt);
if (hres == DRAGDROP_E_ALREADYREGISTERED)
{
g_print ("DRAGDROP_E_ALREADYREGISTERED\n");
CoLockObjectExternal ((IUnknown *) &context->idt, FALSE, FALSE);
}
else if (!SUCCEEDED (hres))
g_warning ("gdk_window_register_dnd: RegisterDragDrop failed");
else
{
gdk_window_add_filter (window, gdk_destroy_filter, &context->idt);
}
}
#endif
}
/*************************************************************
* gdk_drag_get_selection:
* Returns the selection atom for the current source window
* arguments:
*
* results:
*************************************************************/
GdkAtom
gdk_drag_get_selection (GdkDragContext *context)
{
if (context->protocol == GDK_DRAG_PROTO_WIN32_DROPFILES)
return gdk_win32_dropfiles_atom;
else if (context->protocol == GDK_DRAG_PROTO_OLE2)
return gdk_ole2_dnd_atom;
else
return GDK_NONE;
}
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