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Learning_GTK4_tree/gdk/gdkdrop.c

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2023-12-12 11:36:42 +01:00
/*
* 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>
*/
/**
* GdkDrop:
*
* The `GdkDrop` object represents the target of an ongoing DND operation.
*
* Possible drop sites get informed about the status of the ongoing drag
* operation with events of type %GDK_DRAG_ENTER, %GDK_DRAG_LEAVE,
* %GDK_DRAG_MOTION and %GDK_DROP_START. The `GdkDrop` object can be obtained
* from these [class@Gdk.Event] types using [method@Gdk.DNDEvent.get_drop].
*
* The actual data transfer is initiated from the target side via an async
* read, using one of the `GdkDrop` methods for this purpose:
* [method@Gdk.Drop.read_async] or [method@Gdk.Drop.read_value_async].
*
* 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" section of the GTK documentation for more information.
*/
#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 "gdkdragprivate.h"
#include "gdkenumtypes.h"
#include "gdkeventsprivate.h"
#include <glib/gi18n-lib.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)
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_warn_if_fail (priv->state != GDK_DROP_STATE_DROPPING);
g_clear_object (&priv->device);
g_clear_object (&priv->drag);
g_clear_object (&priv->surface);
g_clear_pointer (&priv->formats, gdk_content_formats_unref);
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: (attributes org.gtk.Property.get=gdk_drop_get_actions)
*
* The possible actions for this drop
*/
properties[PROP_ACTIONS] =
g_param_spec_flags ("actions", NULL, NULL,
GDK_TYPE_DRAG_ACTION,
GDK_ACTION_ALL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:device: (attributes org.gtk.Property.get=gdk_drop_get_device)
*
* The `GdkDevice` performing the drop
*/
properties[PROP_DEVICE] =
g_param_spec_object ("device", NULL, NULL,
GDK_TYPE_DEVICE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:display: (attributes org.gtk.Property.get=gdk_drop_get_display)
*
* The `GdkDisplay` that the drop belongs to.
*/
properties[PROP_DISPLAY] =
g_param_spec_object ("display", NULL, NULL,
GDK_TYPE_DISPLAY,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:drag: (attributes org.gtk.Property.get=gdk_drop_get_drag)
*
* The `GdkDrag` that initiated this drop
*/
properties[PROP_DRAG] =
g_param_spec_object ("drag", NULL, NULL,
GDK_TYPE_DRAG,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:formats: (attributes org.gtk.Property.get=gdk_drop_get_formats)
*
* The possible formats that the drop can provide its data in.
*/
properties[PROP_FORMATS] =
g_param_spec_boxed ("formats", NULL, NULL,
GDK_TYPE_CONTENT_FORMATS,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GdkDrop:surface: (attributes org.gtk.Property.get=gdk_drop_get_surface)
*
* The `GdkSurface` the drop happens on
*/
properties[PROP_SURFACE] =
g_param_spec_object ("surface", NULL, NULL,
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: (attributes org.gtk.Method.get_property=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: (attributes org.gtk.Method.get_property=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: (attributes org.gtk.Method.get_property=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: (attributes org.gtk.Method.get_property=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: (attributes org.gtk.Method.get_property=actions)
* @self: a `GdkDrop`
*
* Returns the possible actions for this `GdkDrop`.
*
* If this value contains multiple actions - i.e.
* [func@Gdk.DragAction.is_unique] returns %FALSE for the result -
* [method@Gdk.Drop.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
* [method@Gdk.Drop.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 [class@Gdk.Drop]
* both as a response to source side actions as well as to calls to
* [method@Gdk.Drop.status] or [method@Gdk.Drop.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: (attributes org.gtk.Method.get_property=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 [method@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-and-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 [method@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 I/O priority for the read operation
* @cancellable: (nullable): optional `GCancellable` object
* @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) (transfer none): return location for the used mime type
* @error: (nullable): location to store error information on failure
*
* Finishes an async drop read operation.
*
* Note that you must not use blocking read calls on the returned stream
* in the GTK thread, since some platforms might require communication with
* GTK to complete the data transfer. You can use async APIs such as
* g_input_stream_read_bytes_async().
*
* See [method@Gdk.Drop.read_async].
*
* Returns: (nullable) (transfer full): the `GInputStream`
*/
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_free (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_new0 (GValue, 1);
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 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 must
* then call [method@Gdk.Drop.read_value_finish] to get the resulting
* `GValue`.
*
* For local drag-and-drop operations that are available in the given
* `GType`, the value will be copied directly. Otherwise, GDK will
* try to use [func@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
*
* Finishes an async drop read.
*
* See [method@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);
}