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gtk2/gdk/gdkdnd.c
Matthias Clasen 4a72cab818 Document gdk_drop_read_async
2018-05-03 22:04:28 -04:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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 "gdkdndprivate.h"
#include "gdkdisplay.h"
#include "gdksurface.h"
#include "gdkintl.h"
#include "gdkcontentformats.h"
#include "gdkcontentprovider.h"
#include "gdkcontentserializer.h"
#include "gdkcursor.h"
#include "gdkenumtypes.h"
#include "gdkeventsprivate.h"
typedef struct _GdkDragContextPrivate GdkDragContextPrivate;
struct _GdkDragContextPrivate
{
GdkDisplay *display;
GdkDevice *device;
};
static struct {
GdkDragAction action;
const gchar *name;
GdkCursor *cursor;
} drag_cursors[] = {
{ GDK_ACTION_DEFAULT, NULL, NULL },
{ GDK_ACTION_ASK, "dnd-ask", NULL },
{ GDK_ACTION_COPY, "dnd-copy", NULL },
{ GDK_ACTION_MOVE, "dnd-move", NULL },
{ GDK_ACTION_LINK, "dnd-link", NULL },
{ 0, "dnd-none", NULL },
};
enum {
PROP_0,
PROP_CONTENT,
PROP_DEVICE,
PROP_DISPLAY,
PROP_FORMATS,
N_PROPERTIES
};
enum {
CANCEL,
DROP_PERFORMED,
DND_FINISHED,
ACTION_CHANGED,
N_SIGNALS
};
static GParamSpec *properties[N_PROPERTIES] = { NULL, };
static guint signals[N_SIGNALS] = { 0 };
static GList *contexts = NULL;
G_DEFINE_TYPE_WITH_PRIVATE (GdkDragContext, gdk_drag_context, G_TYPE_OBJECT)
/**
* SECTION:dnd
* @title: Drag And Drop
* @short_description: Functions for controlling drag and drop handling
*
* These functions provide a low level interface for drag and drop.
* The X backend of GDK supports both the Xdnd and Motif drag and drop
* protocols transparently, the Win32 backend supports the WM_DROPFILES
* protocol.
*
* GTK+ provides a higher level abstraction based on top of these functions,
* and so they are not normally needed in GTK+ applications.
* See the [Drag and Drop][gtk3-Drag-and-Drop] section of
* the GTK+ documentation for more information.
*/
/**
* GdkDragContext:
*
* The GdkDragContext struct contains only private fields and
* should not be accessed directly.
*/
/**
* gdk_drag_context_get_display:
* @context: a #GdkDragContext
*
* Gets the #GdkDisplay that the drag context was created for.
*
* Returns: (transfer none): a #GdkDisplay
**/
GdkDisplay *
gdk_drag_context_get_display (GdkDragContext *context)
{
GdkDragContextPrivate *priv = gdk_drag_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return priv->display;
}
/**
* gdk_drag_context_get_formats:
* @context: a #GdkDragContext
*
* Retrieves the formats supported by this context.
*
* Returns: (transfer none): a #GdkContentFormats
**/
GdkContentFormats *
gdk_drag_context_get_formats (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return context->formats;
}
/**
* gdk_drag_context_get_actions:
* @context: a #GdkDragContext
*
* Determines the bitmask of actions proposed by the source if
* gdk_drag_context_get_suggested_action() returns %GDK_ACTION_ASK.
*
* Returns: the #GdkDragAction flags
**/
GdkDragAction
gdk_drag_context_get_actions (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_ACTION_DEFAULT);
return context->actions;
}
/**
* gdk_drag_context_get_suggested_action:
* @context: a #GdkDragContext
*
* Determines the suggested drag action of the context.
*
* Returns: a #GdkDragAction value
**/
GdkDragAction
gdk_drag_context_get_suggested_action (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), 0);
return context->suggested_action;
}
/**
* gdk_drag_context_get_selected_action:
* @context: a #GdkDragContext
*
* Determines the action chosen by the drag destination.
*
* Returns: a #GdkDragAction value
**/
GdkDragAction
gdk_drag_context_get_selected_action (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), 0);
return context->action;
}
/**
* gdk_drag_context_get_source_surface:
* @context: a #GdkDragContext
*
* Returns the #GdkSurface where the DND operation started.
*
* Returns: (transfer none): a #GdkSurface
**/
GdkSurface *
gdk_drag_context_get_source_surface (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return context->source_surface;
}
/**
* gdk_drag_context_get_dest_surface:
* @context: a #GdkDragContext
*
* Returns the destination surface for the DND operation.
*
* Returns: (transfer none): a #GdkSurface
**/
GdkSurface *
gdk_drag_context_get_dest_surface (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return context->dest_surface;
}
/**
* gdk_drag_context_get_device:
* @context: a #GdkDragContext
*
* Returns the #GdkDevice associated to the drag context.
*
* Returns: (transfer none): The #GdkDevice associated to @context.
**/
GdkDevice *
gdk_drag_context_get_device (GdkDragContext *context)
{
GdkDragContextPrivate *priv = gdk_drag_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
return priv->device;
}
static void
gdk_drag_context_init (GdkDragContext *context)
{
contexts = g_list_prepend (contexts, context);
}
static void
gdk_drag_context_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkDragContext *context = GDK_DRAG_CONTEXT (gobject);
GdkDragContextPrivate *priv = gdk_drag_context_get_instance_private (context);
switch (prop_id)
{
case PROP_CONTENT:
context->content = g_value_dup_object (value);
if (context->content)
context->formats = gdk_content_provider_ref_formats (context->content);
break;
case PROP_DEVICE:
priv->device = g_value_dup_object (value);
g_assert (priv->device != NULL);
priv->display = gdk_device_get_display (priv->device);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
gdk_drag_context_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GdkDragContext *context = GDK_DRAG_CONTEXT (gobject);
GdkDragContextPrivate *priv = gdk_drag_context_get_instance_private (context);
switch (prop_id)
{
case PROP_CONTENT:
g_value_set_object (value, context->content);
break;
case PROP_DEVICE:
g_value_set_object (value, priv->device);
break;
case PROP_DISPLAY:
g_value_set_object (value, priv->display);
break;
case PROP_FORMATS:
g_value_set_boxed (value, context->formats);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
gdk_drag_context_finalize (GObject *object)
{
GdkDragContext *context = GDK_DRAG_CONTEXT (object);
contexts = g_list_remove (contexts, context);
g_clear_object (&context->content);
g_clear_pointer (&context->formats, gdk_content_formats_unref);
if (context->source_surface)
g_object_unref (context->source_surface);
if (context->dest_surface)
g_object_unref (context->dest_surface);
G_OBJECT_CLASS (gdk_drag_context_parent_class)->finalize (object);
}
static void
gdk_drag_context_read_local_async (GdkDragContext *context,
GdkContentFormats *formats,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task;
task = g_task_new (context, cancellable, callback, user_data);
g_task_set_priority (task, io_priority);
g_task_set_source_tag (task, gdk_drag_context_read_local_async);
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Reading not implemented."));
g_object_unref (task);
}
static GInputStream *
gdk_drag_context_read_local_finish (GdkDragContext *context,
const char **out_mime_type,
GAsyncResult *result,
GError **error)
{
g_return_val_if_fail (g_task_is_valid (result, context), NULL);
g_return_val_if_fail (g_task_get_source_tag (G_TASK (result)) == gdk_drag_context_read_local_async, NULL);
if (out_mime_type)
*out_mime_type = g_task_get_task_data (G_TASK (result));
return g_task_propagate_pointer (G_TASK (result), error);
}
static void
gdk_drag_context_class_init (GdkDragContextClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->get_property = gdk_drag_context_get_property;
object_class->set_property = gdk_drag_context_set_property;
object_class->finalize = gdk_drag_context_finalize;
/**
* GdkDragContext:content:
*
* The #GdkContentProvider or %NULL if the context is not a source-side
* context.
*/
properties[PROP_CONTENT] =
g_param_spec_object ("content",
"Content",
"The content being dragged",
GDK_TYPE_CONTENT_PROVIDER,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDragContext:device:
*
* The #GdkDevice that is performing the drag.
*/
properties[PROP_DEVICE] =
g_param_spec_object ("device",
"Device",
"The device performing the drag",
GDK_TYPE_DEVICE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDragContext:display:
*
* The #GdkDisplay that the drag context belongs to.
*/
properties[PROP_DISPLAY] =
g_param_spec_object ("display",
"Display",
"Display this drag belongs to",
GDK_TYPE_DISPLAY,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDragContext:formats:
*
* The possible formats that the context can provide its data in.
*/
properties[PROP_FORMATS] =
g_param_spec_boxed ("formats",
"Formats",
"The possible formats for data",
GDK_TYPE_CONTENT_FORMATS,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDragContext::cancel:
* @context: The object on which the signal is emitted
* @reason: The reason the context was cancelled
*
* The drag and drop operation was cancelled.
*/
signals[CANCEL] =
g_signal_new (g_intern_static_string ("cancel"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkDragContextClass, cancel),
NULL, NULL,
g_cclosure_marshal_VOID__ENUM,
G_TYPE_NONE, 1, GDK_TYPE_DRAG_CANCEL_REASON);
/**
* GdkDragContext::drop-performed:
* @context: The object on which the signal is emitted
* @time: the time at which the drop happened.
*
* The drag and drop operation was performed on an accepting client.
*/
signals[DROP_PERFORMED] =
g_signal_new (g_intern_static_string ("drop-performed"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkDragContextClass, drop_performed),
NULL, NULL,
g_cclosure_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
/**
* GdkDragContext::dnd-finished:
* @context: The object on which the signal is emitted
*
* The drag and drop operation was finished, the drag destination
* finished reading all data. The drag source can now free all
* miscellaneous data.
*/
signals[DND_FINISHED] =
g_signal_new (g_intern_static_string ("dnd-finished"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkDragContextClass, dnd_finished),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* GdkDragContext::action-changed:
* @context: The object on which the signal is emitted
* @action: The action currently chosen
*
* A new action is being chosen for the drag and drop operation.
*/
signals[ACTION_CHANGED] =
g_signal_new (g_intern_static_string ("action-changed"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkDragContextClass, action_changed),
NULL, NULL,
g_cclosure_marshal_VOID__FLAGS,
G_TYPE_NONE, 1, GDK_TYPE_DRAG_ACTION);
g_object_class_install_properties (object_class, N_PROPERTIES, properties);
}
/**
* gdk_drag_status:
* @context: a #GdkDragContext
* @action: the selected action which will be taken when a drop happens,
* or 0 to indicate that a drop will not be accepted
* @time_: the timestamp for this operation
*
* Selects one of the actions offered by the drag source.
*
* This function is called by the drag destination in response to
* gdk_drag_motion() called by the drag source.
*/
void
gdk_drag_status (GdkDragContext *context,
GdkDragAction action,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drag_status (context, action, time_);
}
/*
* gdk_drag_abort:
* @context: a #GdkDragContext
* @time_: the timestamp for this operation
*
* Aborts a drag without dropping.
*
* This function is called by the drag source.
*/
void
gdk_drag_abort (GdkDragContext *context,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drag_abort (context, time_);
}
/*
* gdk_drag_drop:
* @context: a #GdkDragContext
* @time_: the timestamp for this operation
*
* Drops on the current destination.
*
* This function is called by the drag source.
*/
void
gdk_drag_drop (GdkDragContext *context,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drag_drop (context, time_);
}
/**
* gdk_drop_finish:
* @context: a #GdkDragContext
* @success: %TRUE if the data was successfully received
* @time_: the timestamp for this operation
*
* Ends the drag operation after a drop.
*
* This function is called by the drag destination.
*/
void
gdk_drop_finish (GdkDragContext *context,
gboolean success,
guint32 time_)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
GDK_DRAG_CONTEXT_GET_CLASS (context)->drop_finish (context, success, time_);
}
static void
gdk_drag_context_write_done (GObject *content,
GAsyncResult *result,
gpointer task)
{
GError *error = NULL;
if (gdk_content_provider_write_mime_type_finish (GDK_CONTENT_PROVIDER (content), result, &error))
g_task_return_boolean (task, TRUE);
else
g_task_return_error (task, error);
g_object_unref (task);
}
static void
gdk_drag_context_write_serialize_done (GObject *content,
GAsyncResult *result,
gpointer task)
{
GError *error = NULL;
if (gdk_content_serialize_finish (result, &error))
g_task_return_boolean (task, TRUE);
else
g_task_return_error (task, error);
g_object_unref (task);
}
void
gdk_drag_context_write_async (GdkDragContext *context,
const char *mime_type,
GOutputStream *stream,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GdkContentFormats *formats, *mime_formats;
GTask *task;
GType gtype;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (context->content);
g_return_if_fail (mime_type != NULL);
g_return_if_fail (mime_type == g_intern_string (mime_type));
g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
g_return_if_fail (callback != NULL);
task = g_task_new (context, cancellable, callback, user_data);
g_task_set_priority (task, io_priority);
g_task_set_source_tag (task, gdk_drag_context_write_async);
formats = gdk_content_provider_ref_formats (context->content);
if (gdk_content_formats_contain_mime_type (formats, mime_type))
{
gdk_content_provider_write_mime_type_async (context->content,
mime_type,
stream,
io_priority,
cancellable,
gdk_drag_context_write_done,
task);
gdk_content_formats_unref (formats);
return;
}
mime_formats = gdk_content_formats_new ((const gchar *[2]) { mime_type, NULL }, 1);
mime_formats = gdk_content_formats_union_serialize_gtypes (mime_formats);
gtype = gdk_content_formats_match_gtype (formats, mime_formats);
if (gtype != G_TYPE_INVALID)
{
GValue value = G_VALUE_INIT;
GError *error = NULL;
g_assert (gtype != G_TYPE_INVALID);
g_value_init (&value, gtype);
if (gdk_content_provider_get_value (context->content, &value, &error))
{
gdk_content_serialize_async (stream,
mime_type,
&value,
io_priority,
cancellable,
gdk_drag_context_write_serialize_done,
g_object_ref (task));
}
else
{
g_task_return_error (task, error);
}
g_value_unset (&value);
}
else
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("No compatible formats to transfer clipboard contents."));
}
gdk_content_formats_unref (mime_formats);
gdk_content_formats_unref (formats);
g_object_unref (task);
}
gboolean
gdk_drag_context_write_finish (GdkDragContext *context,
GAsyncResult *result,
GError **error)
{
g_return_val_if_fail (g_task_is_valid (result, context), FALSE);
g_return_val_if_fail (g_task_get_source_tag (G_TASK (result)) == gdk_drag_context_write_async, FALSE);
return g_task_propagate_boolean (G_TASK (result), error);
}
/**
* gdk_drop_read_async:
* @context: a #GdkDragContext
* @mime_types: (array zero-terminated=1) (element-type utf8): pointer to an array of mime types
* @io_priority: the io priority for the read operation
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
* @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
* @user_data: (closure): the data to pass to @callback
*
* Asynchronously read the dropped data from a DND context
* in a format that complies with one of the mime types.
*/
void
gdk_drop_read_async (GdkDragContext *context,
const char **mime_types,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GdkContentFormats *formats;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (mime_types != NULL && mime_types[0] != NULL);
g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
g_return_if_fail (callback != NULL);
formats = gdk_content_formats_new (mime_types, g_strv_length ((char **) mime_types));
GDK_DRAG_CONTEXT_GET_CLASS (context)->read_async (context,
formats,
io_priority,
cancellable,
callback,
user_data);
gdk_content_formats_unref (formats);
}
/**
* gdk_drop_read_finish:
* @context: a #GdkDragContext
* @out_mime_type: (out) (type utf8): return location for the used mime type
* @result: a #GAsyncResult
* @error: (allow-none): location to store error information on failure, or %NULL
*
* Finishes an async drop read operation, see gdk_drop_read_async().
*
* Returns: (nullable) (transfer full): the #GInputStream, or %NULL
*/
GInputStream *
gdk_drop_read_finish (GdkDragContext *context,
const char **out_mime_type,
GAsyncResult *result,
GError **error)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
if (g_async_result_is_tagged (result, gdk_drag_context_read_local_async))
{
return gdk_drag_context_read_local_finish (context, out_mime_type, result, error);
}
else
{
return GDK_DRAG_CONTEXT_GET_CLASS (context)->read_finish (context, out_mime_type, result, error);
}
}
/**
* gdk_drag_context_get_drag_surface:
* @context: a #GdkDragContext
*
* Returns the surface on which the drag icon should be rendered
* during the drag operation. Note that the surface may not be
* available until the drag operation has begun. GDK will move
* the surface in accordance with the ongoing drag operation.
* The surface is owned by @context and will be destroyed when
* the drag operation is over.
*
* Returns: (nullable) (transfer none): the drag surface, or %NULL
*/
GdkSurface *
gdk_drag_context_get_drag_surface (GdkDragContext *context)
{
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
if (GDK_DRAG_CONTEXT_GET_CLASS (context)->get_drag_surface)
return GDK_DRAG_CONTEXT_GET_CLASS (context)->get_drag_surface (context);
return NULL;
}
/**
* gdk_drag_context_set_hotspot:
* @context: a #GdkDragContext
* @hot_x: x coordinate of the drag surface hotspot
* @hot_y: y coordinate of the drag surface hotspot
*
* Sets the position of the drag surface that will be kept
* under the cursor hotspot. Initially, the hotspot is at the
* top left corner of the drag surface.
*/
void
gdk_drag_context_set_hotspot (GdkDragContext *context,
gint hot_x,
gint hot_y)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
if (GDK_DRAG_CONTEXT_GET_CLASS (context)->set_hotspot)
GDK_DRAG_CONTEXT_GET_CLASS (context)->set_hotspot (context, hot_x, hot_y);
}
/**
* gdk_drag_drop_done:
* @context: a #GdkDragContext
* @success: whether the drag was ultimatively successful
*
* Inform GDK if the drop ended successfully. Passing %FALSE
* for @success may trigger a drag cancellation animation.
*
* This function is called by the drag source, and should
* be the last call before dropping the reference to the
* @context.
*
* The #GdkDragContext will only take the first gdk_drag_drop_done()
* call as effective, if this function is called multiple times,
* all subsequent calls will be ignored.
*/
void
gdk_drag_drop_done (GdkDragContext *context,
gboolean success)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
if (context->drop_done)
return;
context->drop_done = TRUE;
if (GDK_DRAG_CONTEXT_GET_CLASS (context)->drop_done)
GDK_DRAG_CONTEXT_GET_CLASS (context)->drop_done (context, success);
}
void
gdk_drag_context_set_cursor (GdkDragContext *context,
GdkCursor *cursor)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
if (GDK_DRAG_CONTEXT_GET_CLASS (context)->set_cursor)
GDK_DRAG_CONTEXT_GET_CLASS (context)->set_cursor (context, cursor);
}
void
gdk_drag_context_cancel (GdkDragContext *context,
GdkDragCancelReason reason)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_signal_emit (context, signals[CANCEL], 0, reason);
}
gboolean
gdk_drag_context_handle_source_event (GdkEvent *event)
{
GdkDragContext *context;
GList *l;
for (l = contexts; l; l = l->next)
{
context = l->data;
if (!context->is_source)
continue;
if (!GDK_DRAG_CONTEXT_GET_CLASS (context)->handle_event)
continue;
if (GDK_DRAG_CONTEXT_GET_CLASS (context)->handle_event (context, event))
return TRUE;
}
return FALSE;
}
GdkCursor *
gdk_drag_get_cursor (GdkDragContext *context,
GdkDragAction action)
{
gint i;
for (i = 0 ; i < G_N_ELEMENTS (drag_cursors) - 1; i++)
if (drag_cursors[i].action == action)
break;
if (drag_cursors[i].cursor == NULL)
drag_cursors[i].cursor = gdk_cursor_new_from_name (drag_cursors[i].name, NULL);
return drag_cursors[i].cursor;
}
static void
gdk_drag_context_commit_drag_status (GdkDragContext *context)
{
GdkDragContextClass *context_class;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (!context->is_source);
context_class = GDK_DRAG_CONTEXT_GET_CLASS (context);
if (context_class->commit_drag_status)
context_class->commit_drag_status (context);
}
gboolean
gdk_drag_context_handle_dest_event (GdkEvent *event)
{
GdkDragContext *context = NULL;
switch ((guint) event->any.type)
{
case GDK_DRAG_MOTION:
case GDK_DROP_START:
context = event->dnd.context;
break;
default:
return FALSE;
}
if (!context)
return FALSE;
gdk_drag_context_commit_drag_status (context);
return TRUE;;
}
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