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gtk/gdk/gdkdrop.c
Emmanuele Bassi f28aa1ba02 Restructure the GdkEvent type hierarchy 
GdkEvent has been a "I-can't-believe-this-is-not-OOP" type for ages,
using a union of sub-types. This has always been problematic when it
comes to implementing accessor functions: either you get generic API
that takes a GdkEvent and uses a massive switch() to determine which
event types have the data you're looking for; or you create namespaced
accessors, but break language bindings horribly, as boxed types cannot
have derived types.

The recent conversion of GskRenderNode (which had similar issues) to
GTypeInstance, and the fact that GdkEvent is now a completely opaque
type, provide us with the chance of moving GdkEvent to GTypeInstance,
and have sub-types for GdkEvent.

The change from boxed type to GTypeInstance is pretty small, all things
considered, but ends up cascading to a larger commit, as we still have
backends and code in GTK trying to access GdkEvent structures directly.
Additionally, the naming of the public getter functions requires
renaming all the data structures to conform to the namespace/type-name
pattern.
2020-04-16 19:54:02 +01:00

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/*
* Copyright © 2018 Benjamin Otte
*
* 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 2.1 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/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gdkdropprivate.h"
#include "gdkcontentdeserializer.h"
#include "gdkcontentformats.h"
#include "gdkcontentprovider.h"
#include "gdkcontentserializer.h"
#include "gdkcursor.h"
#include "gdkdisplay.h"
#include "gdkenumtypes.h"
#include "gdkeventsprivate.h"
#include "gdkinternals.h"
#include "gdkintl.h"
#include "gdkpipeiostreamprivate.h"
#include "gdksurface.h"
typedef struct _GdkDropPrivate GdkDropPrivate;
struct _GdkDropPrivate {
GdkDevice *device;
GdkDrag *drag;
GdkContentFormats *formats;
GdkSurface *surface;
GdkDragAction actions;
guint entered : 1; /* TRUE if we got an enter event but not a leave event yet */
enum {
GDK_DROP_STATE_NONE, /* pointer is dragging along */
GDK_DROP_STATE_DROPPING, /* DROP_START has been sent */
GDK_DROP_STATE_FINISHED /* gdk_drop_finish() has been called */
} state : 2;
};
enum {
PROP_0,
PROP_ACTIONS,
PROP_DEVICE,
PROP_DISPLAY,
PROP_DRAG,
PROP_FORMATS,
PROP_SURFACE,
N_PROPERTIES
};
static GParamSpec *properties[N_PROPERTIES] = { NULL, };
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GdkDrop, gdk_drop, G_TYPE_OBJECT)
/**
* GdkDrop:
*
* The GdkDrop struct contains only private fields and
* should not be accessed directly.
*/
static void
gdk_drop_default_status (GdkDrop *self,
GdkDragAction actions,
GdkDragAction preferred)
{
}
static void
gdk_drop_read_local_write_done (GObject *drag,
GAsyncResult *result,
gpointer stream)
{
/* we don't care about the error, we just want to clean up */
gdk_drag_write_finish (GDK_DRAG (drag), result, NULL);
/* XXX: Do we need to close_async() here? */
g_output_stream_close (stream, NULL, NULL);
g_object_unref (stream);
}
static void
gdk_drop_read_local_async (GdkDrop *self,
GdkContentFormats *formats,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
GdkContentFormats *content_formats;
const char *mime_type;
GTask *task;
GdkContentProvider *content;
task = g_task_new (self, cancellable, callback, user_data);
g_task_set_priority (task, io_priority);
g_task_set_source_tag (task, gdk_drop_read_local_async);
if (priv->drag == NULL)
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Drag’n’drop from other applications is not supported."));
g_object_unref (task);
return;
}
g_object_get (priv->drag, "content", &content, NULL);
content_formats = gdk_content_provider_ref_formats (content);
g_object_unref (content);
content_formats = gdk_content_formats_union_serialize_mime_types (content_formats);
mime_type = gdk_content_formats_match_mime_type (content_formats, formats);
if (mime_type != NULL)
{
GOutputStream *output_stream;
GIOStream *stream;
stream = gdk_pipe_io_stream_new ();
output_stream = g_io_stream_get_output_stream (stream);
gdk_drag_write_async (priv->drag,
mime_type,
output_stream,
io_priority,
cancellable,
gdk_drop_read_local_write_done,
g_object_ref (output_stream));
g_task_set_task_data (task, (gpointer) mime_type, NULL);
g_task_return_pointer (task, g_object_ref (g_io_stream_get_input_stream (stream)), g_object_unref);
g_object_unref (stream);
}
else
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("No compatible formats to transfer contents."));
}
gdk_content_formats_unref (content_formats);
g_object_unref (task);
}
static GInputStream *
gdk_drop_read_local_finish (GdkDrop *self,
GAsyncResult *result,
const char **out_mime_type,
GError **error)
{
g_return_val_if_fail (g_task_is_valid (result, self), NULL);
g_return_val_if_fail (g_task_get_source_tag (G_TASK (result)) == gdk_drop_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_drop_add_formats (GdkDrop *self,
GdkContentFormats *formats)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
formats = gdk_content_formats_union_deserialize_gtypes (gdk_content_formats_ref (formats));
if (priv->formats)
{
formats = gdk_content_formats_union (formats, priv->formats);
gdk_content_formats_unref (priv->formats);
}
priv->formats = formats;
}
static void
gdk_drop_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkDrop *self = GDK_DROP (gobject);
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
switch (prop_id)
{
case PROP_ACTIONS:
gdk_drop_set_actions (self, g_value_get_flags (value));
break;
case PROP_DEVICE:
priv->device = g_value_dup_object (value);
g_assert (priv->device != NULL);
if (priv->surface)
g_assert (gdk_surface_get_display (priv->surface) == gdk_device_get_display (priv->device));
break;
case PROP_DRAG:
priv->drag = g_value_dup_object (value);
if (priv->drag)
gdk_drop_add_formats (self, gdk_drag_get_formats (priv->drag));
break;
case PROP_FORMATS:
gdk_drop_add_formats (self, g_value_get_boxed (value));
g_assert (priv->formats != NULL);
break;
case PROP_SURFACE:
priv->surface = g_value_dup_object (value);
g_assert (priv->surface != NULL);
if (priv->device)
g_assert (gdk_surface_get_display (priv->surface) == gdk_device_get_display (priv->device));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
gdk_drop_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GdkDrop *self = GDK_DROP (gobject);
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
switch (prop_id)
{
case PROP_ACTIONS:
g_value_set_flags (value, priv->actions);
break;
case PROP_DEVICE:
g_value_set_object (value, priv->device);
break;
case PROP_DISPLAY:
g_value_set_object (value, gdk_device_get_display (priv->device));
break;
case PROP_DRAG:
g_value_set_object (value, priv->drag);
break;
case PROP_FORMATS:
g_value_set_boxed (value, priv->formats);
break;
case PROP_SURFACE:
g_value_set_object (value, priv->surface);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
gdk_drop_finalize (GObject *object)
{
GdkDrop *self = GDK_DROP (object);
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
/* someone forgot to send a LEAVE signal */
g_warn_if_fail (!priv->entered);
/* Should we emit finish() here if necessary?
* For now that's the backends' job */
g_clear_object (&priv->device);
g_clear_object (&priv->drag);
G_OBJECT_CLASS (gdk_drop_parent_class)->finalize (object);
}
static void
gdk_drop_class_init (GdkDropClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
klass->status = gdk_drop_default_status;
object_class->get_property = gdk_drop_get_property;
object_class->set_property = gdk_drop_set_property;
object_class->finalize = gdk_drop_finalize;
/**
* GdkDrop:actions:
*
* The possible actions for this drop
*/
properties[PROP_ACTIONS] =
g_param_spec_flags ("actions",
"Actions",
"The possible actions for this drop",
GDK_TYPE_DRAG_ACTION,
GDK_ACTION_ALL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:device:
*
* The #GdkDevice performing the drop
*/
properties[PROP_DEVICE] =
g_param_spec_object ("device",
"Device",
"The device performing the drop",
GDK_TYPE_DEVICE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:display:
*
* The #GdkDisplay that the drop 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);
/**
* GdkDrop:drag:
*
* The #GdkDrag that initiated this drop
*/
properties[PROP_DRAG] =
g_param_spec_object ("drag",
"Drag",
"The drag that initiated this drop",
GDK_TYPE_DRAG,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:formats:
*
* The possible formats that the drop 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_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:surface:
*
* The #GdkSurface the drop happens on
*/
properties[PROP_SURFACE] =
g_param_spec_object ("surface",
"Surface",
"The surface the drop is happening on",
GDK_TYPE_SURFACE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (object_class, N_PROPERTIES, properties);
}
static void
gdk_drop_init (GdkDrop *self)
{
}
/**
* gdk_drop_get_display:
* @self: a #GdkDrop
*
* Gets the #GdkDisplay that @self was created for.
*
* Returns: (transfer none): a #GdkDisplay
**/
GdkDisplay *
gdk_drop_get_display (GdkDrop *self)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_val_if_fail (GDK_IS_DROP (self), NULL);
return gdk_device_get_display (priv->device);
}
/**
* gdk_drop_get_device:
* @self: a #GdkDrop
*
* Returns the #GdkDevice performing the drop.
*
* Returns: (transfer none): The #GdkDevice performing the drop.
**/
GdkDevice *
gdk_drop_get_device (GdkDrop *self)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_val_if_fail (GDK_IS_DROP (self), NULL);
return priv->device;
}
/**
* gdk_drop_get_formats:
* @self: a #GdkDrop
*
* Returns the #GdkContentFormats that the drop offers the data
* to be read in.
*
* Returns: (transfer none): The possible #GdkContentFormats
**/
GdkContentFormats *
gdk_drop_get_formats (GdkDrop *self)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_val_if_fail (GDK_IS_DROP (self), NULL);
return priv->formats;
}
/**
* gdk_drop_get_surface:
* @self: a #GdkDrop
*
* Returns the #GdkSurface performing the drop.
*
* Returns: (transfer none): The #GdkSurface performing the drop.
**/
GdkSurface *
gdk_drop_get_surface (GdkDrop *self)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_val_if_fail (GDK_IS_DROP (self), NULL);
return priv->surface;
}
/**
* gdk_drop_get_actions:
* @self: a #GdkDrop
*
* Returns the possible actions for this #GdkDrop. If this value
* contains multiple actions - ie gdk_drag_action_is_unique()
* returns %FALSE for the result - gdk_drag_finish() must choose
* the action to use when accepting the drop. This will only
* happen if you passed %GDK_ACTION_ASK as one of the possible
* actions in gdk_drag_status(). %GDK_ACTION_ASK itself will not
* be included in the actions returned by this function.
*
* This value may change over the lifetime of the #GdkDrop both
* as a response to source side actions as well as to calls to
* gdk_drop_status() or gdk_drag_finish(). The source side will
* not change this value anymore once a drop has started.
*
* Returns: The possible #GdkDragActions
**/
GdkDragAction
gdk_drop_get_actions (GdkDrop *self)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_val_if_fail (GDK_IS_DROP (self), 0);
return priv->actions;
}
void
gdk_drop_set_actions (GdkDrop *self,
GdkDragAction actions)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_if_fail (GDK_IS_DROP (self));
g_return_if_fail (priv->state == GDK_DROP_STATE_NONE);
g_return_if_fail ((actions & GDK_ACTION_ASK) == 0);
if (priv->actions == actions)
return;
priv->actions = actions;
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ACTIONS]);
}
/**
* gdk_drop_get_drag:
* @self: a #GdkDrop
*
* If this is an in-app drag-and-drop operation, returns the #GdkDrag
* that corresponds to this drop.
*
* If it is not, %NULL is returned.
*
* Returns: (transfer none) (nullable): the corresponding #GdkDrag
**/
GdkDrag *
gdk_drop_get_drag (GdkDrop *self)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_val_if_fail (GDK_IS_DROP (self), 0);
return priv->drag;
}
/**
* gdk_drop_status:
* @self: a #GdkDrop
* @actions: Supported actions of the destination, or 0 to indicate
* that a drop will not be accepted
* @preferred: A unique action that's a member of @actions indicating the
* preferred action.
*
* Selects all actions that are potentially supported by the destination.
*
* When calling this function, do not restrict the passed in actions to
* the ones provided by gdk_drop_get_actions(). Those actions may
* change in the future, even depending on the actions you provide here.
*
* The @preferred action is a hint to the drag'n'drop mechanism about which
* action to use when multiple actions are possible.
*
* This function should be called by drag destinations in response to
* %GDK_DRAG_ENTER or %GDK_DRAG_MOTION events. If the destination does
* not yet know the exact actions it supports, it should set any possible
* actions first and then later call this function again.
*/
void
gdk_drop_status (GdkDrop *self,
GdkDragAction actions,
GdkDragAction preferred)
{
#ifndef G_DISABLE_CHECKS
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
#endif
g_return_if_fail (GDK_IS_DROP (self));
g_return_if_fail (priv->state != GDK_DROP_STATE_FINISHED);
g_return_if_fail (gdk_drag_action_is_unique (preferred));
g_return_if_fail ((preferred & actions) == preferred);
GDK_DROP_GET_CLASS (self)->status (self, actions, preferred);
}
/**
* gdk_drop_finish:
* @self: a #GdkDrop
* @action: the action performed by the destination or 0 if the drop
* failed
*
* Ends the drag operation after a drop.
*
* The @action must be a single action selected from the actions
* available via gdk_drop_get_actions().
**/
void
gdk_drop_finish (GdkDrop *self,
GdkDragAction action)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_if_fail (GDK_IS_DROP (self));
g_return_if_fail (priv->state == GDK_DROP_STATE_DROPPING);
g_return_if_fail (gdk_drag_action_is_unique (action));
GDK_DROP_GET_CLASS (self)->finish (self, action);
priv->state = GDK_DROP_STATE_FINISHED;
}
static void
gdk_drop_read_internal (GdkDrop *self,
GdkContentFormats *formats,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
g_return_if_fail (priv->state != GDK_DROP_STATE_FINISHED);
if (priv->drag)
{
gdk_drop_read_local_async (self,
formats,
io_priority,
cancellable,
callback,
user_data);
}
else
{
GDK_DROP_GET_CLASS (self)->read_async (self,
formats,
io_priority,
cancellable,
callback,
user_data);
}
}
/**
* gdk_drop_read_async:
* @self: a #GdkDrop
* @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 #GdkDrop
* in a format that complies with one of the mime types.
*/
void
gdk_drop_read_async (GdkDrop *self,
const char **mime_types,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GdkContentFormats *formats;
g_return_if_fail (GDK_IS_DROP (self));
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_drop_read_internal (self, formats, io_priority, cancellable, callback, user_data);
gdk_content_formats_unref (formats);
}
/**
* gdk_drop_read_finish:
* @self: a #GdkDrop
* @result: a #GAsyncResult
* @out_mime_type: (out) (type utf8): return location for the used mime type
* @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 (GdkDrop *self,
GAsyncResult *result,
const char **out_mime_type,
GError **error)
{
g_return_val_if_fail (GDK_IS_DROP (self), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
if (g_async_result_is_tagged (result, gdk_drop_read_local_async))
{
return gdk_drop_read_local_finish (self, result, out_mime_type, error);
}
else
{
return GDK_DROP_GET_CLASS (self)->read_finish (self, result, out_mime_type, error);
}
}
static void
gdk_drop_read_value_done (GObject *source,
GAsyncResult *result,
gpointer data)
{
GTask *task = data;
GError *error = NULL;
GValue *value;
value = g_task_get_task_data (task);
if (!gdk_content_deserialize_finish (result, value, &error))
g_task_return_error (task, error);
else
g_task_return_pointer (task, value, NULL);
g_object_unref (task);
}
static void
gdk_drop_read_value_got_stream (GObject *source,
GAsyncResult *result,
gpointer data)
{
GInputStream *stream;
GError *error = NULL;
GTask *task = data;
const char *mime_type;
stream = gdk_drop_read_finish (GDK_DROP (source), result, &mime_type, &error);
if (stream == NULL)
{
g_task_return_error (task, error);
return;
}
gdk_content_deserialize_async (stream,
mime_type,
G_VALUE_TYPE (g_task_get_task_data (task)),
g_task_get_priority (task),
g_task_get_cancellable (task),
gdk_drop_read_value_done,
task);
g_object_unref (stream);
}
static void
free_value (gpointer value)
{
g_value_unset (value);
g_slice_free (GValue, value);
}
static void
gdk_drop_read_value_internal (GdkDrop *self,
GType type,
gpointer source_tag,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
GdkContentFormatsBuilder *builder;
GdkContentFormats *formats;
GValue *value;
GTask *task;
g_return_if_fail (priv->state != GDK_DROP_STATE_FINISHED);
task = g_task_new (self, cancellable, callback, user_data);
g_task_set_priority (task, io_priority);
g_task_set_source_tag (task, source_tag);
value = g_slice_new0 (GValue);
g_value_init (value, type);
g_task_set_task_data (task, value, free_value);
if (priv->drag)
{
GError *error = NULL;
gboolean res;
res = gdk_content_provider_get_value (gdk_drag_get_content (priv->drag),
value,
&error);
if (res)
{
g_task_return_pointer (task, value, NULL);
g_object_unref (task);
return;
}
else if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED))
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
else
{
/* fall through to regular stream transfer */
g_clear_error (&error);
}
}
builder = gdk_content_formats_builder_new ();
gdk_content_formats_builder_add_gtype (builder, type);
formats = gdk_content_formats_builder_free_to_formats (builder);
formats = gdk_content_formats_union_deserialize_mime_types (formats);
gdk_drop_read_internal (self,
formats,
io_priority,
cancellable,
gdk_drop_read_value_got_stream,
task);
gdk_content_formats_unref (formats);
}
/**
* gdk_drop_read_value_async:
* @self: a #GdkDrop
* @type: a #GType to read
* @io_priority: the [I/O priority][io-priority]
* of the request.
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (scope async): callback to call when the request is satisfied
* @user_data: (closure): the data to pass to callback function
*
* Asynchronously request the drag operation's contents converted to the given
* @type. When the operation is finished @callback will be called.
* You can then call gdk_drop_read_value_finish() to get the resulting
* #GValue.
*
* For local drag'n'drop operations that are available in the given #GType, the
* value will be copied directly. Otherwise, GDK will try to use
* gdk_content_deserialize_async() to convert the data.
**/
void
gdk_drop_read_value_async (GdkDrop *self,
GType type,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_return_if_fail (GDK_IS_DROP (self));
g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
g_return_if_fail (callback != NULL);
gdk_drop_read_value_internal (self,
type,
gdk_drop_read_value_async,
io_priority,
cancellable,
callback,
user_data);
}
/**
* gdk_drop_read_value_finish:
* @self: a #GdkDrop
* @result: a #GAsyncResult
* @error: a #GError location to store the error occurring, or %NULL to
* ignore.
*
* Finishes an async drop read started with
* gdk_drop_read_value_async().
*
* Returns: (transfer none): a #GValue containing the result.
**/
const GValue *
gdk_drop_read_value_finish (GdkDrop *self,
GAsyncResult *result,
GError **error)
{
g_return_val_if_fail (g_task_is_valid (result, self), NULL);
g_return_val_if_fail (g_task_get_source_tag (G_TASK (result)) == gdk_drop_read_value_async, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
return g_task_propagate_pointer (G_TASK (result), error);
}
static void
gdk_drop_do_emit_event (GdkEvent *event,
gboolean dont_queue)
{
if (dont_queue)
{
_gdk_event_emit (event);
gdk_event_unref (event);
}
else
{
_gdk_event_queue_append (gdk_event_get_display (event), event);
}
}
void
gdk_drop_emit_enter_event (GdkDrop *self,
gboolean dont_queue,
double x,
double y,
guint32 time)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
GdkEvent *event;
g_warn_if_fail (!priv->entered);
event = gdk_dnd_event_new (GDK_DRAG_ENTER,
priv->surface,
priv->device,
self,
time,
0, 0);
priv->entered = TRUE;
gdk_drop_do_emit_event (event, dont_queue);
}
void
gdk_drop_emit_motion_event (GdkDrop *self,
gboolean dont_queue,
double x,
double y,
guint32 time)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
GdkEvent *event;
g_warn_if_fail (priv->entered);
event = gdk_dnd_event_new (GDK_DRAG_MOTION,
priv->surface,
priv->device,
self,
time,
x, y);
gdk_drop_do_emit_event (event, dont_queue);
}
void
gdk_drop_emit_leave_event (GdkDrop *self,
gboolean dont_queue,
guint32 time)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
GdkEvent *event;
g_warn_if_fail (priv->entered);
event = gdk_dnd_event_new (GDK_DRAG_LEAVE,
priv->surface,
priv->device,
self,
time,
0, 0);
priv->entered = FALSE;
gdk_drop_do_emit_event (event, dont_queue);
}
void
gdk_drop_emit_drop_event (GdkDrop *self,
gboolean dont_queue,
double x,
double y,
guint32 time)
{
GdkDropPrivate *priv = gdk_drop_get_instance_private (self);
GdkEvent *event;
g_warn_if_fail (priv->entered);
g_warn_if_fail (priv->state == GDK_DROP_STATE_NONE);
event = gdk_dnd_event_new (GDK_DROP_START,
priv->surface,
priv->device,
self,
time,
x, y);
priv->state = GDK_DROP_STATE_DROPPING;
gdk_drop_do_emit_event (event, dont_queue);
}
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