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gtk/gdk/win32/gdkdrop-win32.c
Matthias Clasen 67877e403f win32: Fix some leaks 
My reading of the code is that gdk_drop_new() is not
consuming the content formats it is given, so the caller
must not pass a new reference.

Needs testing on Windows.
2021-02-07 09:41:34 -05:00

1428 lines
43 KiB
C
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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 <io.h>
#include <fcntl.h>
/* 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 "gdkdropprivate.h"
#include "gdkdrag.h"
#include "gdkinternals.h"
#include "gdkprivate-win32.h"
#include "gdkwin32.h"
#include "gdkwin32dnd.h"
#include "gdkdisplayprivate.h"
#include "gdkwin32dnd-private.h"
#include "gdkdisplay-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>
#define GDK_TYPE_WIN32_DROP (gdk_win32_drop_get_type ())
#define GDK_WIN32_DROP(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_WIN32_DROP, GdkWin32Drop))
#define GDK_WIN32_DROP_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_WIN32_DROP, GdkWin32DropClass))
#define GDK_IS_WIN32_DROP(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_WIN32_DROP))
#define GDK_IS_WIN32_DROP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_WIN32_DROP))
#define GDK_WIN32_DROP_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_WIN32_DROP, GdkWin32DropClass))
typedef struct _GdkWin32Drop GdkWin32Drop;
typedef struct _GdkWin32DropClass GdkWin32DropClass;
struct _GdkWin32Drop
{
GdkDrop drop;
/* The drag protocol being in use */
GdkDragProtocol protocol;
/* The actions supported at GTK level. Set in gdk_win32_drop_status(). */
GdkDragAction actions;
guint scale; /* Temporarily caches the HiDPI scale */
int last_x; /* Coordinates from last event, in GDK space */
int last_y;
DWORD last_key_state; /* Key state from last event */
/* Just like GdkDrop->formats, but an array, and with format IDs
* stored inside.
*/
GArray *droptarget_w32format_contentformat_map;
/* The list from WM_DROPFILES is store here temporarily,
* until the next gdk_win32_drop_read_async ()
*/
char *dropfiles_list;
guint drop_finished : 1; /* FALSE until gdk_drop_finish() is called */
guint drop_failed : 1; /* Whether the drop was unsuccessful */
};
struct _GdkWin32DropClass
{
GdkDropClass parent_class;
};
GType gdk_win32_drop_get_type (void);
G_DEFINE_TYPE (GdkWin32Drop, gdk_win32_drop, GDK_TYPE_DROP)
/* This structure is presented to COM as an object that
* implements IDropTarget interface. Every surface that
* can be a droptarget has one of these.
*/
struct _drop_target_context
{
IDropTarget idt;
int ref_count;
/* The drop object we create when a drag enters our surface.
* The drop object is destroyed when the drag leaves.
*/
GdkDrop *drop;
/* We get this at the object at creation time and keep
* it indefinitely. Drops (see above) come and go, but
* this surface remains the same.
* This is not a reference, as drop_target_context must not
* outlive the surface it's attached to.
* drop_target_context is not folded into GdkWin32Surface
* only because it's easier to present it to COM as a separate
* object when it's allocated separately.
*/
GdkSurface *surface;
/* This is given to us by the OS, we store it here
* until the drag leaves our window. It is referenced
* (using COM reference counting).
*/
IDataObject *data_object;
};
/* TRUE to use OLE2 protocol, FALSE to use local protocol */
static gboolean use_ole2_dnd = TRUE;
static void
gdk_win32_drop_init (GdkWin32Drop *drop)
{
drop->droptarget_w32format_contentformat_map = g_array_new (FALSE, FALSE, sizeof (GdkWin32ContentFormatPair));
GDK_NOTE (DND, g_print ("gdk_win32_drop_init %p\n", drop));
}
static void
gdk_win32_drop_finalize (GObject *object)
{
GdkDrop *drop;
GdkWin32Drop *drop_win32;
GDK_NOTE (DND, g_print ("gdk_win32_drop_finalize %p\n", object));
drop = GDK_DROP (object);
drop_win32 = GDK_WIN32_DROP (drop);
g_array_unref (drop_win32->droptarget_w32format_contentformat_map);
G_OBJECT_CLASS (gdk_win32_drop_parent_class)->finalize (object);
}
static GdkDrop *
gdk_drop_new (GdkDisplay *display,
GdkDevice *device,
GdkDrag *drag,
GdkContentFormats *formats,
GdkSurface *surface,
GdkDragProtocol protocol)
{
GdkWin32Drop *drop_win32;
GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (display);
drop_win32 = g_object_new (GDK_TYPE_WIN32_DROP,
"device", device,
"drag", drag,
"formats", formats,
"surface", surface,
NULL);
if (win32_display->has_fixed_scale)
drop_win32->scale = win32_display->surface_scale;
else
drop_win32->scale = _gdk_win32_display_get_monitor_scale_factor (win32_display, NULL, NULL, NULL);
drop_win32->protocol = protocol;
return GDK_DROP (drop_win32);
}
/* Gets the GdkDrop that corresponds to a particular GdkSurface.
* Will be NULL for surfaces that are not registered as drop targets,
* or for surfaces that are currently not under the drag cursor.
* This function is only used for local DnD, where we do have
* a real GdkSurface that corresponds to the HWND under cursor.
*/
GdkDrop *
_gdk_win32_get_drop_for_dest_surface (GdkSurface *dest)
{
GdkWin32Surface *impl;
if (dest == NULL)
return NULL;
impl = GDK_WIN32_SURFACE (dest);
if (impl->drop_target != NULL)
return impl->drop_target->drop;
return impl->drop;
}
#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 ULONG STDMETHODCALLTYPE
idroptarget_addref (LPDROPTARGET This)
{
drop_target_context *ctx = (drop_target_context *) This;
int ref_count = ++ctx->ref_count;
GDK_NOTE (DND, g_print ("idroptarget_addref %p %d\n", This, ref_count));
return ref_count;
}
static HRESULT STDMETHODCALLTYPE
idroptarget_queryinterface (LPDROPTARGET This,
REFIID riid,
LPVOID *ppvObject)
{
GDK_NOTE (DND, {
g_print ("idroptarget_queryinterface %p ", This);
PRINT_GUID (riid);
});
*ppvObject = NULL;
if (IsEqualGUID (riid, &IID_IUnknown))
{
GDK_NOTE (DND, g_print ("...IUnknown S_OK\n"));
idroptarget_addref (This);
*ppvObject = This;
return S_OK;
}
else if (IsEqualGUID (riid, &IID_IDropTarget))
{
GDK_NOTE (DND, g_print ("...IDropTarget S_OK\n"));
idroptarget_addref (This);
*ppvObject = This;
return S_OK;
}
else
{
GDK_NOTE (DND, g_print ("...E_NOINTERFACE\n"));
return E_NOINTERFACE;
}
}
static ULONG STDMETHODCALLTYPE
idroptarget_release (LPDROPTARGET This)
{
drop_target_context *ctx = (drop_target_context *) This;
int ref_count = --ctx->ref_count;
GDK_NOTE (DND, g_print ("idroptarget_release %p %d\n", This, ref_count));
if (ref_count == 0)
{
g_clear_object (&ctx->drop);
g_free (This);
}
return ref_count;
}
static GdkContentFormats *
query_object_formats (LPDATAOBJECT pDataObj,
GArray *w32format_contentformat_map)
{
IEnumFORMATETC *pfmt = NULL;
FORMATETC fmt;
HRESULT hr;
GdkContentFormatsBuilder *builder;
GdkContentFormats *result_formats;
builder = gdk_content_formats_builder_new ();
hr = IDataObject_EnumFormatEtc (pDataObj, DATADIR_GET, &pfmt);
if (SUCCEEDED (hr))
hr = IEnumFORMATETC_Next (pfmt, 1, &fmt, NULL);
while (SUCCEEDED (hr) && hr != S_FALSE)
{
gboolean is_predef;
char *registered_name = _gdk_win32_get_clipboard_format_name (fmt.cfFormat, &is_predef);
if (registered_name && is_predef)
GDK_NOTE (DND, g_print ("supported built-in source format 0x%x %s\n", fmt.cfFormat, registered_name));
else if (registered_name)
GDK_NOTE (DND, g_print ("supported source format 0x%x %s\n", fmt.cfFormat, registered_name));
else
GDK_NOTE (DND, g_print ("supported unnamed? source format 0x%x\n", fmt.cfFormat));
g_free (registered_name);
_gdk_win32_add_w32format_to_pairs (fmt.cfFormat, w32format_contentformat_map, builder);
hr = IEnumFORMATETC_Next (pfmt, 1, &fmt, NULL);
}
if (pfmt)
IEnumFORMATETC_Release (pfmt);
result_formats = gdk_content_formats_builder_free_to_formats (builder);
return result_formats;
}
static void
set_data_object (LPDATAOBJECT *location, LPDATAOBJECT data_object)
{
if (*location != NULL)
IDataObject_Release (*location);
*location = data_object;
if (*location != NULL)
IDataObject_AddRef (*location);
}
/* Figures out an action that the user forces onto us by
* pressing some modifier keys.
*/
static GdkDragAction
get_user_action (DWORD grfKeyState)
{
/* Windows explorer does this:
* 'C'ontrol for 'C'opy
* a'L't (or Contro'L' + Shift) for 'L'ink
* Shift for Move
* Control + Alt or Shift + Alt or Control + Alt + Shift for Default action (see below).
*
* Default action is 'Copy' when dragging between drives, 'Move' otherwise.
* For GTK 'between drives' turns into 'between applications'.
*/
if (((grfKeyState & (MK_CONTROL | MK_ALT)) == (MK_CONTROL | MK_ALT)) ||
((grfKeyState & (MK_ALT | MK_SHIFT)) == (MK_ALT | MK_SHIFT)) ||
((grfKeyState & (MK_CONTROL | MK_ALT | MK_SHIFT)) == (MK_CONTROL | MK_ALT | MK_SHIFT)))
{
return 0;
}
else if ((grfKeyState & (MK_CONTROL | MK_SHIFT)) == (MK_CONTROL | MK_SHIFT))
return GDK_ACTION_LINK;
else if (grfKeyState & MK_CONTROL)
return GDK_ACTION_COPY;
else if (grfKeyState & MK_ALT)
return GDK_ACTION_MOVE;
return 0;
}
static DWORD
drop_effect_for_actions (GdkDragAction actions)
{
DWORD effects = 0;
int effect_count = 0;
if (actions & GDK_ACTION_MOVE)
{
effects |= DROPEFFECT_MOVE;
effect_count++;
}
if (actions & GDK_ACTION_LINK)
{
effects |= DROPEFFECT_LINK;
effect_count++;
}
if (actions & GDK_ACTION_COPY)
{
effects |= DROPEFFECT_COPY;
effect_count++;
}
if (effect_count == 0)
effects = DROPEFFECT_NONE;
else if (effect_count > 1)
/* Actually it should be DROPEFECT_ASK, but Windows doesn't support that */
effects = DROPEFFECT_COPY;
return effects;
}
static GdkDragAction
actions_for_drop_effects (DWORD effects)
{
GdkDragAction actions = 0;
if (effects & DROPEFFECT_MOVE)
actions |= GDK_ACTION_MOVE;
if (effects & DROPEFFECT_LINK)
actions |= GDK_ACTION_LINK;
if (effects & DROPEFFECT_COPY)
actions |= GDK_ACTION_COPY;
return actions;
}
static GdkDragAction
filter_actions (GdkDragAction actions,
GdkDragAction filter)
{
return actions & filter;
}
static GdkDragAction
set_source_actions_helper (GdkDrop *drop,
GdkDragAction actions,
DWORD grfKeyState)
{
GdkDragAction user_action;
user_action = get_user_action (grfKeyState);
if (user_action != 0)
gdk_drop_set_actions (drop, user_action);
else
gdk_drop_set_actions (drop, actions);
return actions;
}
void
_gdk_win32_local_drop_target_dragenter (GdkDrag *drag,
GdkSurface *dest_surface,
int x_root,
int y_root,
DWORD grfKeyState,
guint32 time_,
GdkDragAction *actions)
{
GdkDrop *drop;
GdkWin32Drop *drop_win32;
GdkDisplay *display;
GdkDragAction source_actions;
GdkWin32Surface *impl = GDK_WIN32_SURFACE (dest_surface);
GDK_NOTE (DND, g_print ("_gdk_win32_local_drop_target_dragenter %p @ %d : %d"
" for dest window 0x%p"
". actions = %s\n",
drag, x_root, y_root,
dest_surface,
_gdk_win32_drag_action_to_string (*actions)));
display = gdk_surface_get_display (dest_surface);
drop = gdk_drop_new (display,
gdk_seat_get_pointer (gdk_display_get_default_seat (display)),
drag,
gdk_drag_get_formats (drag),
dest_surface,
GDK_DRAG_PROTO_LOCAL);
drop_win32 = GDK_WIN32_DROP (drop);
impl->drop = drop;
source_actions = set_source_actions_helper (drop, *actions, grfKeyState);
gdk_drop_emit_enter_event (drop, TRUE, x_root, y_root, time_);
drop_win32->last_key_state = grfKeyState;
drop_win32->last_x = x_root;
drop_win32->last_y = y_root;
*actions = filter_actions (drop_win32->actions, source_actions);
GDK_NOTE (DND, g_print ("_gdk_win32_local_drop_target_dragenter returns with actions %s\n",
_gdk_win32_drag_action_to_string (*actions)));
}
/* The pdwEffect here initially points
* to a DWORD that contains the value of dwOKEffects argument in DoDragDrop,
* i.e. the drag action that the drag source deems acceptable.
* On return it should point to the effect value that denotes the
* action that is going to happen on drop, and that is what DoDragDrop will
* put into the DWORD that pdwEffect was pointing to.
*/
static HRESULT STDMETHODCALLTYPE
idroptarget_dragenter (LPDROPTARGET This,
LPDATAOBJECT pDataObj,
DWORD grfKeyState,
POINTL pt,
LPDWORD pdwEffect_and_dwOKEffects)
{
drop_target_context *ctx = (drop_target_context *) This;
GdkDrop *drop;
GdkWin32Drop *drop_win32;
GdkDisplay *display;
int pt_x;
int pt_y;
GdkDrag *drag;
GdkDragAction source_actions;
GdkDragAction dest_actions;
GdkContentFormats *formats;
GDK_NOTE (DND, g_print ("idroptarget_dragenter %p @ %ld : %ld"
" for dest window 0x%p"
". dwOKEffects = %lu\n",
This, pt.x, pt.y,
ctx->surface,
*pdwEffect_and_dwOKEffects));
g_clear_object (&ctx->drop);
/* Try to find the GdkDrag object for this DnD operation,
* if it originated in our own application.
*/
drag = NULL;
if (ctx->surface)
drag = _gdk_win32_find_drag_for_dest_window (GDK_SURFACE_HWND (ctx->surface));
display = gdk_surface_get_display (ctx->surface);
formats = query_object_formats (pDataObj, NULL);
drop = gdk_drop_new (display,
gdk_seat_get_pointer (gdk_display_get_default_seat (display)),
drag,
formats,
ctx->surface,
GDK_DRAG_PROTO_OLE2);
drop_win32 = GDK_WIN32_DROP (drop);
g_array_set_size (drop_win32->droptarget_w32format_contentformat_map, 0);
gdk_content_formats_unref (formats);
ctx->drop = drop;
source_actions = set_source_actions_helper (drop,
actions_for_drop_effects (*pdwEffect_and_dwOKEffects),
grfKeyState);
set_data_object (&ctx->data_object, pDataObj);
pt_x = pt.x / drop_win32->scale + _gdk_offset_x;
pt_y = pt.y / drop_win32->scale + _gdk_offset_y;
gdk_drop_emit_enter_event (drop, TRUE, pt_x, pt_y, GDK_CURRENT_TIME);
drop_win32->last_key_state = grfKeyState;
drop_win32->last_x = pt_x;
drop_win32->last_y = pt_y;
dest_actions = filter_actions (drop_win32->actions, source_actions);
*pdwEffect_and_dwOKEffects = drop_effect_for_actions (dest_actions);
GDK_NOTE (DND, g_print ("idroptarget_dragenter returns S_OK with actions %s"
" and drop effect %lu\n",
_gdk_win32_drag_action_to_string (dest_actions),
*pdwEffect_and_dwOKEffects));
return S_OK;
}
gboolean
_gdk_win32_local_drop_target_will_emit_motion (GdkDrop *drop,
int x_root,
int y_root,
DWORD grfKeyState)
{
GdkWin32Drop *drop_win32 = GDK_WIN32_DROP (drop);
if (x_root != drop_win32->last_x ||
y_root != drop_win32->last_y ||
grfKeyState != drop_win32->last_key_state)
return TRUE;
return FALSE;
}
void
_gdk_win32_local_drop_target_dragover (GdkDrop *drop,
GdkDrag *drag,
int x_root,
int y_root,
DWORD grfKeyState,
guint32 time_,
GdkDragAction *actions)
{
GdkWin32Drop *drop_win32 = GDK_WIN32_DROP (drop);
GdkDragAction source_actions;
source_actions = set_source_actions_helper (drop, *actions, grfKeyState);
GDK_NOTE (DND, g_print ("_gdk_win32_local_drop_target_dragover %p @ %d : %d"
", actions = %s\n",
drop, x_root, y_root,
_gdk_win32_drag_action_to_string (*actions)));
if (_gdk_win32_local_drop_target_will_emit_motion (drop, x_root, y_root, grfKeyState))
{
gdk_drop_emit_motion_event (drop, TRUE, x_root, y_root, time_);
drop_win32->last_key_state = grfKeyState;
drop_win32->last_x = x_root;
drop_win32->last_y = y_root;
}
*actions = filter_actions (drop_win32->actions, source_actions);
GDK_NOTE (DND, g_print ("_gdk_win32_local_drop_target_dragover returns with actions %s\n",
_gdk_win32_drag_action_to_string (*actions)));
}
/* NOTE: This method is called continuously, even if nothing is
* happening, as long as the drag operation is in progress and
* the cursor is above our window.
* It is OK to return a "safe" dropeffect value (DROPEFFECT_NONE,
* to indicate that the drop is not possible here), when we
* do not yet have any real information about acceptability of
* the drag, because we will have another opportunity to return
* the "right" value (once we know what it is, after GTK processes
* the events we emit) very soon.
*/
static HRESULT STDMETHODCALLTYPE
idroptarget_dragover (LPDROPTARGET This,
DWORD grfKeyState,
POINTL pt,
LPDWORD pdwEffect_and_dwOKEffects)
{
drop_target_context *ctx = (drop_target_context *) This;
GdkWin32Drop *drop_win32 = GDK_WIN32_DROP (ctx->drop);
int pt_x = pt.x / drop_win32->scale + _gdk_offset_x;
int pt_y = pt.y / drop_win32->scale + _gdk_offset_y;
GdkDragAction source_actions;
GdkDragAction dest_actions;
source_actions = set_source_actions_helper (ctx->drop,
actions_for_drop_effects (*pdwEffect_and_dwOKEffects),
grfKeyState);
GDK_NOTE (DND, g_print ("idroptarget_dragover %p @ %d : %d"
" (raw %ld : %ld)"
", dwOKEffects = %lu"
", suggests %d action\n",
This, pt_x, pt_y,
pt.x, pt.y,
*pdwEffect_and_dwOKEffects,
source_actions));
if (pt_x != drop_win32->last_x ||
pt_y != drop_win32->last_y ||
grfKeyState != drop_win32->last_key_state)
{
gdk_drop_emit_motion_event (ctx->drop, TRUE, pt_x, pt_y, GDK_CURRENT_TIME);
drop_win32->last_key_state = grfKeyState;
drop_win32->last_x = pt_x;
drop_win32->last_y = pt_y;
}
dest_actions = filter_actions (drop_win32->actions, source_actions);
*pdwEffect_and_dwOKEffects = drop_effect_for_actions (dest_actions);
GDK_NOTE (DND, g_print ("idroptarget_dragover returns S_OK with actions %s"
" and effect %lu\n",
_gdk_win32_drag_action_to_string (dest_actions),
*pdwEffect_and_dwOKEffects));
return S_OK;
}
void
_gdk_win32_local_drop_target_dragleave (GdkDrop *drop,
guint32 time_)
{
GdkWin32Surface *impl = GDK_WIN32_SURFACE (gdk_drop_get_surface (drop));
GDK_NOTE (DND, g_print ("_gdk_win32_local_drop_target_dragleave %p\n", drop));
gdk_drop_emit_leave_event (drop, TRUE, time_);
g_clear_object (&impl->drop);
}
static HRESULT STDMETHODCALLTYPE
idroptarget_dragleave (LPDROPTARGET This)
{
drop_target_context *ctx = (drop_target_context *) This;
GDK_NOTE (DND, g_print ("idroptarget_dragleave %p S_OK\n", This));
gdk_drop_emit_leave_event (GDK_DROP (ctx->drop), TRUE, GDK_CURRENT_TIME);
g_clear_object (&ctx->drop);
set_data_object (&ctx->data_object, NULL);
return S_OK;
}
void
_gdk_win32_local_drop_target_drop (GdkDrop *drop,
GdkDrag *drag,
guint32 time_,
GdkDragAction *actions)
{
GdkWin32Drop *drop_win32 = GDK_WIN32_DROP (drop);
GDK_NOTE (DND, g_print ("_gdk_win32_local_drop_target_drop %p ", drop));
set_source_actions_helper (drop,
*actions,
drop_win32->last_key_state);
drop_win32->drop_finished = FALSE;
gdk_drop_emit_drop_event (drop, TRUE, drop_win32->last_x, drop_win32->last_y, time_);
while (!drop_win32->drop_finished)
g_main_context_iteration (NULL, FALSE);
/* Notify local source of the DnD result
* Special case:
* drop_win32->actions is guaranteed to contain 1 action after gdk_drop_finish ()
*/
*actions = drop_win32->actions;
GDK_NOTE (DND, g_print ("drop with action %s\n", _gdk_win32_drag_action_to_string (*actions)));
}
static HRESULT STDMETHODCALLTYPE
idroptarget_drop (LPDROPTARGET This,
LPDATAOBJECT pDataObj,
DWORD grfKeyState,
POINTL pt,
LPDWORD pdwEffect_and_dwOKEffects)
{
drop_target_context *ctx = (drop_target_context *) This;
GdkWin32Drop *drop_win32 = GDK_WIN32_DROP (ctx->drop);
int pt_x = pt.x / drop_win32->scale + _gdk_offset_x;
int pt_y = pt.y / drop_win32->scale + _gdk_offset_y;
GdkDragAction dest_action;
GDK_NOTE (DND, g_print ("idroptarget_drop %p ", This));
if (pDataObj == NULL)
{
GDK_NOTE (DND, g_print ("E_POINTER\n"));
gdk_drop_emit_leave_event (ctx->drop, TRUE, GDK_CURRENT_TIME);
g_clear_object (&ctx->drop);
set_data_object (&ctx->data_object, NULL);
return E_POINTER;
}
set_source_actions_helper (ctx->drop,
actions_for_drop_effects (*pdwEffect_and_dwOKEffects),
grfKeyState);
drop_win32->drop_finished = FALSE;
gdk_drop_emit_drop_event (ctx->drop, TRUE, pt_x, pt_y, GDK_CURRENT_TIME);
while (!drop_win32->drop_finished)
g_main_context_iteration (NULL, FALSE);
/* Notify OLE of the DnD result
* Special case:
* drop_win32->actions is guaranteed to contain 1 action after gdk_drop_finish ()
*/
dest_action = drop_win32->actions;
*pdwEffect_and_dwOKEffects = drop_effect_for_actions (dest_action);
g_clear_object (&ctx->drop);
set_data_object (&ctx->data_object, NULL);
GDK_NOTE (DND, g_print ("drop S_OK with effect %lx\n", *pdwEffect_and_dwOKEffects));
return S_OK;
}
static IDropTargetVtbl idt_vtbl = {
idroptarget_queryinterface,
idroptarget_addref,
idroptarget_release,
idroptarget_dragenter,
idroptarget_dragover,
idroptarget_dragleave,
idroptarget_drop
};
static drop_target_context *
target_context_new (GdkSurface *window)
{
drop_target_context *result;
result = g_new0 (drop_target_context, 1);
result->idt.lpVtbl = &idt_vtbl;
result->ref_count = 0;
result->surface = window;
idroptarget_addref (&result->idt);
GDK_NOTE (DND, g_print ("target_context_new: %p (window %p)\n", result, result->surface));
return result;
}
/* From MS Knowledge Base article Q130698 */
static gboolean
resolve_link (HWND hWnd,
wchar_t *link,
char **lpszPath)
{
WIN32_FILE_ATTRIBUTE_DATA wfad;
HRESULT hr;
IShellLinkW *pslW = NULL;
IPersistFile *ppf = NULL;
/* Check if the file is empty first because IShellLink::Resolve for
* some reason succeeds with an empty file and returns an empty
* "link target". (#524151)
*/
if (!GetFileAttributesExW (link, GetFileExInfoStandard, &wfad) ||
(wfad.nFileSizeHigh == 0 && wfad.nFileSizeLow == 0))
return FALSE;
/* Assume failure to start with: */
*lpszPath = 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.
*/
hr = CoCreateInstance (&CLSID_ShellLink,
NULL,
CLSCTX_INPROC_SERVER,
&IID_IShellLinkW,
(LPVOID *)&pslW);
if (SUCCEEDED (hr))
{
/* The IShellLink interface supports the IPersistFile
* interface. Get an interface pointer to it.
*/
hr = pslW->lpVtbl->QueryInterface (pslW,
&IID_IPersistFile,
(LPVOID *) &ppf);
}
if (SUCCEEDED (hr))
{
/* Load the file. */
hr = ppf->lpVtbl->Load (ppf, link, STGM_READ);
}
if (SUCCEEDED (hr))
{
/* Resolve the link by calling the Resolve()
* interface function.
*/
hr = pslW->lpVtbl->Resolve (pslW, hWnd, SLR_ANY_MATCH | SLR_NO_UI);
}
if (SUCCEEDED (hr))
{
wchar_t wtarget[MAX_PATH];
hr = pslW->lpVtbl->GetPath (pslW, wtarget, MAX_PATH, NULL, 0);
if (SUCCEEDED (hr))
*lpszPath = g_utf16_to_utf8 (wtarget, -1, NULL, NULL, NULL);
}
if (ppf)
ppf->lpVtbl->Release (ppf);
if (pslW)
pslW->lpVtbl->Release (pslW);
return SUCCEEDED (hr);
}
#if 0
/* Check for filenames like C:\Users\tml\AppData\Local\Temp\d5qtkvvs.bmp */
static gboolean
filename_looks_tempish (const char *filename)
{
char *dirname;
char *p;
const char *q;
gboolean retval = FALSE;
dirname = g_path_get_dirname (filename);
p = dirname;
q = g_get_tmp_dir ();
while (*p && *q &&
((G_IS_DIR_SEPARATOR (*p) && G_IS_DIR_SEPARATOR (*q)) ||
g_ascii_tolower (*p) == g_ascii_tolower (*q)))
p++, q++;
if (!*p && !*q)
retval = TRUE;
g_free (dirname);
return retval;
}
static gboolean
close_it (gpointer data)
{
close (GPOINTER_TO_INT (data));
return FALSE;
}
#endif
static GdkWin32MessageFilterReturn
gdk_dropfiles_filter (GdkWin32Display *display,
MSG *msg,
int *ret_valp,
gpointer data)
{
GdkSurface *window;
GdkDrop *drop;
GdkWin32Drop *drop_win32;
GString *result;
HANDLE hdrop;
POINT pt;
int nfiles, i;
char *fileName, *linkedFile;
if (msg->message != WM_DROPFILES)
return GDK_WIN32_MESSAGE_FILTER_CONTINUE;
GDK_NOTE (DND, g_print ("WM_DROPFILES: %p\n", msg->hwnd));
window = gdk_win32_handle_table_lookup (msg->hwnd);
drop = gdk_drop_new (GDK_DISPLAY (display),
gdk_seat_get_pointer (gdk_display_get_default_seat (GDK_DISPLAY (display))),
NULL,
/* WM_DROPFILES drops are always file names */
gdk_content_formats_new ((const char *[2]) {
"text/uri-list",
NULL
}, 1),
window,
GDK_DRAG_PROTO_WIN32_DROPFILES);
drop_win32 = GDK_WIN32_DROP (drop);
gdk_drop_set_actions (drop, GDK_ACTION_COPY);
hdrop = (HANDLE) msg->wParam;
DragQueryPoint (hdrop, &pt);
ClientToScreen (msg->hwnd, &pt);
nfiles = DragQueryFile (hdrop, 0xFFFFFFFF, NULL, 0);
result = g_string_new (NULL);
for (i = 0; i < nfiles; i++)
{
char *uri;
wchar_t wfn[MAX_PATH];
DragQueryFileW (hdrop, i, wfn, MAX_PATH);
fileName = g_utf16_to_utf8 (wfn, -1, NULL, NULL, NULL);
/* Resolve shortcuts */
if (resolve_link (msg->hwnd, wfn, &linkedFile))
{
uri = g_filename_to_uri (linkedFile, NULL, NULL);
if (uri != NULL)
{
g_string_append (result, uri);
GDK_NOTE (DND, g_print ("... %s link to %s: %s\n",
fileName, linkedFile, uri));
g_free (uri);
}
g_free (fileName);
fileName = linkedFile;
}
else
{
uri = g_filename_to_uri (fileName, NULL, NULL);
if (uri != NULL)
{
g_string_append (result, uri);
GDK_NOTE (DND, g_print ("... %s: %s\n", fileName, uri));
g_free (uri);
}
}
#if 0
/* Awful hack to recognize temp files corresponding to
* images dragged from Firefox... Open the file right here
* so that it is less likely that Firefox manages to delete
* it before the GTK-using app (typically GIMP) has opened
* it.
*
* Not compiled in for now, because it means images dragged
* from Firefox would stay around in the temp folder which
* is not what Firefox intended. I don't feel comfortable
* with that, both from a geenral sanity point of view, and
* from a privacy point of view. It's better to wait for
* Firefox to fix the problem, for instance by deleting the
* temp file after a longer delay, or to wait until we
* implement the OLE2_DND...
*/
if (filename_looks_tempish (fileName))
{
int fd = g_open (fileName, _O_RDONLY|_O_BINARY, 0);
if (fd == -1)
{
GDK_NOTE (DND, g_print ("Could not open %s, maybe an image dragged from Firefox that it already deleted\n", fileName));
}
else
{
GDK_NOTE (DND, g_print ("Opened %s as %d so that Firefox won't delete it\n", fileName, fd));
g_timeout_add_seconds (1, close_it, GINT_TO_POINTER (fd));
}
}
#endif
g_free (fileName);
g_string_append (result, "\015\012");
}
g_clear_pointer (&drop_win32->dropfiles_list, g_free);
drop_win32->dropfiles_list = result->str;
g_string_free (result, FALSE);
if (drop_win32->dropfiles_list == NULL)
drop_win32->dropfiles_list = g_strdup ("");
gdk_drop_emit_drop_event (drop,
FALSE,
pt.x / drop_win32->scale + _gdk_offset_x,
pt.y / drop_win32->scale + _gdk_offset_y,
_gdk_win32_get_next_tick (msg->time));
DragFinish (hdrop);
*ret_valp = 0;
return GDK_WIN32_MESSAGE_FILTER_REMOVE;
}
static void
gdk_win32_drop_status (GdkDrop *drop,
GdkDragAction actions,
GdkDragAction preferred)
{
GdkWin32Drop *drop_win32 = GDK_WIN32_DROP (drop);
GdkDrag *drag;
g_return_if_fail (drop != NULL);
GDK_NOTE (DND, g_print ("gdk_win32_drop_status: %s\n"
" context=%p:{source_actions=%s, preferred=%s}\n",
_gdk_win32_drag_action_to_string (actions),
drop,
_gdk_win32_drag_action_to_string (gdk_drop_get_actions (drop)),
_gdk_win32_drag_action_to_string (preferred)));
drop_win32->actions = actions;
if (drop_win32->protocol == GDK_DRAG_PROTO_OLE2)
return;
drag = gdk_drop_get_drag (drop);
if (drag != NULL)
_gdk_win32_local_drag_give_feedback (drag, actions);
}
static void
gdk_win32_drop_finish (GdkDrop *drop,
GdkDragAction action)
{
GdkWin32Drop *drop_win32 = GDK_WIN32_DROP (drop);
g_return_if_fail (drop != NULL);
GDK_NOTE (DND, g_print ("gdk_win32_drop_finish with action %s\n",
_gdk_win32_drag_action_to_string (action)));
drop_win32->actions = action;
drop_win32->drop_finished = TRUE;
if (drop_win32->protocol == GDK_DRAG_PROTO_OLE2)
return;
}
#if 0
static GdkFilterReturn
gdk_destroy_filter (GdkXEvent *xev,
GdkEvent *event,
gpointer data)
{
MSG *msg = (MSG *) xev;
if (msg->message == WM_DESTROY)
{
IDropTarget *idtp = (IDropTarget *) data;
GDK_NOTE (DND, g_print ("gdk_destroy_filter: WM_DESTROY: %p\n", msg->hwnd));
#if 0
idtp->lpVtbl->Release (idtp);
#endif
RevokeDragDrop (msg->hwnd);
CoLockObjectExternal ((IUnknown*) idtp, FALSE, TRUE);
}
return GDK_FILTER_CONTINUE;
}
#endif
void
_gdk_win32_surface_register_dnd (GdkSurface *window)
{
drop_target_context *ctx;
HRESULT hr;
g_return_if_fail (window != NULL);
if (g_object_get_data (G_OBJECT (window), "gdk-dnd-registered") != NULL)
return;
else
g_object_set_data (G_OBJECT (window), "gdk-dnd-registered", GINT_TO_POINTER (TRUE));
GDK_NOTE (DND, g_print ("gdk_win32_surface_register_dnd: %p\n", GDK_SURFACE_HWND (window)));
if (!use_ole2_dnd)
{
/* 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_win32_display_add_filter (GDK_WIN32_DISPLAY (gdk_display_get_default ()), gdk_dropfiles_filter, NULL);
DragAcceptFiles (GDK_SURFACE_HWND (window), TRUE);
}
else
{
GdkWin32Surface *impl = GDK_WIN32_SURFACE (window);
/* Return if window is already setup for DND. */
if (impl->drop_target != NULL)
return;
ctx = target_context_new (window);
hr = CoLockObjectExternal ((IUnknown *) &ctx->idt, TRUE, FALSE);
if (!SUCCEEDED (hr))
OTHER_API_FAILED ("CoLockObjectExternal");
else
{
hr = RegisterDragDrop (GDK_SURFACE_HWND (window), &ctx->idt);
if (hr == DRAGDROP_E_ALREADYREGISTERED)
{
g_print ("DRAGDROP_E_ALREADYREGISTERED\n");
CoLockObjectExternal ((IUnknown *) &ctx->idt, FALSE, FALSE);
}
else if (!SUCCEEDED (hr))
OTHER_API_FAILED ("RegisterDragDrop");
else
{
impl->drop_target = ctx;
}
}
}
}
void
_gdk_win32_surface_unregister_dnd (GdkSurface *window)
{
GdkWin32Surface *impl = GDK_WIN32_SURFACE (window);
if (impl->drop_target)
idroptarget_release (&impl->drop_target->idt);
}
static gpointer
grab_data_from_hdata (GTask *task,
HANDLE hdata,
gsize *data_len)
{
gpointer ptr;
SIZE_T length;
guchar *data;
ptr = GlobalLock (hdata);
if (ptr == NULL)
{
DWORD error_code = GetLastError ();
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Cannot get DnD data. GlobalLock(0x%p) failed: 0x%lx."), hdata, error_code);
return NULL;
}
length = GlobalSize (hdata);
if (length == 0 && GetLastError () != NO_ERROR)
{
DWORD error_code = GetLastError ();
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Cannot get DnD data. GlobalSize(0x%p) failed: 0x%lx."), hdata, error_code);
GlobalUnlock (hdata);
return NULL;
}
data = g_try_malloc (length);
if (data == NULL)
{
char *length_str = g_strdup_printf ("%" G_GSIZE_FORMAT, length);
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Cannot get DnD data. Failed to allocate %s bytes to store the data."), length_str);
g_free (length_str);
GlobalUnlock (hdata);
return NULL;
}
memcpy (data, ptr, length);
*data_len = length;
GlobalUnlock (hdata);
return data;
}
static void
gdk_win32_drop_read_async (GdkDrop *drop,
GdkContentFormats *formats,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GdkWin32Drop *drop_win32 = GDK_WIN32_DROP (drop);
GTask *task;
drop_target_context *tctx;
const char * const *mime_types;
gsize i, j, n_mime_types;
GdkWin32ContentFormatPair *pair;
FORMATETC fmt;
HRESULT hr;
STGMEDIUM storage;
guchar *data;
gsize data_len;
GInputStream *stream;
task = g_task_new (drop, cancellable, callback, user_data);
g_task_set_priority (task, io_priority);
g_task_set_source_tag (task, gdk_win32_drop_read_async);
mime_types = gdk_content_formats_get_mime_types (formats, &n_mime_types);
if (drop_win32->protocol == GDK_DRAG_PROTO_WIN32_DROPFILES)
{
for (i = 0; i < n_mime_types; i++)
if (g_strcmp0 (mime_types[i], "text/uri-list") == 0)
break;
if (i >= n_mime_types)
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("No compatible transfer format found"));
g_clear_pointer (&drop_win32->dropfiles_list, g_free);
return;
}
stream = g_memory_input_stream_new_from_data (drop_win32->dropfiles_list, strlen (drop_win32->dropfiles_list), g_free);
drop_win32->dropfiles_list = NULL;
g_object_set_data (G_OBJECT (stream), "gdk-dnd-stream-contenttype", (gpointer) "text/uri-list");
g_task_return_pointer (task, stream, g_object_unref);
return;
}
tctx = GDK_WIN32_SURFACE (gdk_drop_get_surface (drop))->drop_target;
if (tctx == NULL)
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
_("GDK surface 0x%p is not registered as a drop target"), gdk_drop_get_surface (drop));
return;
}
if (tctx->data_object == NULL)
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Target context record 0x%p has no data object"), tctx);
return;
}
for (pair = NULL, i = 0; i < n_mime_types; i++)
{
for (j = 0; j < drop_win32->droptarget_w32format_contentformat_map->len; j++)
{
pair = &g_array_index (drop_win32->droptarget_w32format_contentformat_map, GdkWin32ContentFormatPair, j);
if (pair->contentformat == mime_types[i])
break;
pair = NULL;
}
}
if (pair == NULL)
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("No compatible transfer format found"));
return;
}
fmt.cfFormat = pair->w32format;
if (_gdk_win32_format_uses_hdata (pair->w32format))
fmt.tymed = TYMED_HGLOBAL;
else
g_assert_not_reached ();
fmt.ptd = NULL;
fmt.dwAspect = DVASPECT_CONTENT;
fmt.lindex = -1;
hr = IDataObject_GetData (tctx->data_object, &fmt, &storage);
if (!SUCCEEDED (hr) || hr != S_OK)
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
_("IDataObject_GetData (0x%x) failed, returning 0x%lx"), fmt.cfFormat, hr);
return;
}
if (!pair->transmute)
{
if (_gdk_win32_format_uses_hdata (pair->w32format))
{
data = grab_data_from_hdata (task, storage.hGlobal, &data_len);
if (data == NULL)
{
ReleaseStgMedium (&storage);
return;
}
}
else
{
g_assert_not_reached ();
}
}
else
{
_gdk_win32_transmute_windows_data (pair->w32format, pair->contentformat, storage.hGlobal, &data, &data_len);
}
ReleaseStgMedium (&storage);
if (data == NULL)
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Failed to transmute DnD data W32 format 0x%x to %p (%s)"), pair->w32format, pair->contentformat, pair->contentformat);
return;
}
stream = g_memory_input_stream_new_from_data (data, data_len, g_free);
g_object_set_data (G_OBJECT (stream), "gdk-dnd-stream-contenttype", (gpointer) pair->contentformat);
g_task_return_pointer (task, stream, g_object_unref);
}
static GInputStream *
gdk_win32_drop_read_finish (GdkDrop *drop,
GAsyncResult *result,
const char **out_mime_type,
GError **error)
{
GTask *task;
GInputStream *stream;
g_return_val_if_fail (g_task_is_valid (result, G_OBJECT (drop)), NULL);
task = G_TASK (result);
g_return_val_if_fail (g_task_get_source_tag (task) == gdk_win32_drop_read_async, NULL);
stream = g_task_propagate_pointer (task, error);
if (stream && out_mime_type)
*out_mime_type = g_object_get_data (G_OBJECT (stream), "gdk-dnd-stream-contenttype");
return stream;
}
static void
gdk_win32_drop_class_init (GdkWin32DropClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GdkDropClass *drop_class = GDK_DROP_CLASS (klass);
object_class->finalize = gdk_win32_drop_finalize;
drop_class->status = gdk_win32_drop_status;
drop_class->finish = gdk_win32_drop_finish;
drop_class->read_async = gdk_win32_drop_read_async;
drop_class->read_finish = gdk_win32_drop_read_finish;
}
void
_gdk_drop_init (void)
{
if (g_strcmp0 (getenv ("GDK_WIN32_OLE2_DND"), "0") == 0)
use_ole2_dnd = FALSE;
}
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