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gtk2/gtk/gtkdnd.c
Matthias Clasen e02fd80adb dnd: Be safer 
The contents of the selection are documented
to not be NULL if size is non-negative. So
use an empty string instead of NULL for size 0,
avoiding a crash.
2020-01-01 12:51:19 -05:00

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/* GTK - The GIMP Toolkit
* 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 "gtkdndprivate.h"
#include "gtkdragdest.h"
#include "gtkimageprivate.h"
#include "gtkintl.h"
#include "gtkmain.h"
#include "gtkpicture.h"
#include "gtkselectionprivate.h"
#include "gtksettingsprivate.h"
#include "gtkstylecontext.h"
#include "gtktooltipprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkwindowgroup.h"
#include "gtkwindowprivate.h"
#include "gtknative.h"
#include "gtkdragiconprivate.h"
#include "gdk/gdkcontentformatsprivate.h"
#include "gdk/gdktextureprivate.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
/**
* SECTION:gtkdnd
* @Short_description: Functions for controlling drag and drop handling
* @Title: Drag and Drop
*
* GTK+ has a rich set of functions for doing inter-process communication
* via the drag-and-drop metaphor.
*
* As well as the functions listed here, applications may need to use some
* facilities provided for [Selections][gtk3-Selections]. Also, the Drag and
* Drop API makes use of signals in the #GtkWidget class.
*/
typedef struct _GtkDragSourceInfo GtkDragSourceInfo;
typedef struct _GtkDragDestInfo GtkDragDestInfo;
struct _GtkDragSourceInfo
{
GtkWidget *widget;
GdkContentFormats *target_list; /* Targets for drag data */
GdkDrag *drag; /* drag context */
GtkWidget *icon_window; /* Window for drag */
GtkWidget *icon_widget; /* Widget for drag */
guint drop_timeout; /* Timeout for aborting drop */
guint destroy_icon : 1; /* If true, destroy icon_widget */
};
struct _GtkDragDestInfo
{
GtkWidget *widget; /* Widget in which drag is in */
GdkDrop *drop; /* drop */
};
#define DROP_ABORT_TIME 300000
typedef gboolean (* GtkDragDestCallback) (GtkWidget *widget,
GdkDrop *drop,
gint x,
gint y,
guint32 time);
/* Forward declarations */
static gboolean gtk_drop_find_widget (GtkWidget *widget,
GdkDrop *drop,
GtkDragDestInfo *info,
gint x,
gint y,
guint32 time,
GtkDragDestCallback callback);
static void gtk_drag_dest_leave (GtkWidget *widget,
GdkDrop *drop,
guint time);
static gboolean gtk_drag_dest_motion (GtkWidget *widget,
GdkDrop *drop,
gint x,
gint y,
guint time);
static gboolean gtk_drag_dest_drop (GtkWidget *widget,
GdkDrop *drop,
gint x,
gint y,
guint time);
static void gtk_drag_dest_set_widget (GtkDragDestInfo *info,
GtkWidget *widget);
static GtkDragDestInfo * gtk_drag_get_dest_info (GdkDrop *drop,
gboolean create);
static GtkDragSourceInfo *gtk_drag_get_source_info (GdkDrag *drag,
gboolean create);
static void gtk_drag_clear_source_info (GdkDrag *drag);
static void gtk_drag_drop (GtkDragSourceInfo *info);
static void gtk_drag_drop_finished (GtkDragSourceInfo *info,
GtkDragResult result);
static void gtk_drag_cancel_internal (GtkDragSourceInfo *info,
GtkDragResult result);
static void gtk_drag_remove_icon (GtkDragSourceInfo *info);
static void gtk_drag_source_info_destroy (GtkDragSourceInfo *info);
static void gtk_drag_drop_performed_cb (GdkDrag *drag,
GtkDragSourceInfo *info);
static void gtk_drag_cancel_cb (GdkDrag *drag,
GdkDragCancelReason reason,
GtkDragSourceInfo *info);
static void gtk_drag_dnd_finished_cb (GdkDrag *drag,
GtkDragSourceInfo *info);
static gboolean gtk_drag_abort_timeout (gpointer data);
static void set_icon_helper (GdkDrag *drag,
GtkImageDefinition *def,
gint hot_x,
gint hot_y);
/********************
* Destination side *
********************/
typedef struct {
GdkDrop *drop;
GtkWidget *widget;
const char *mime_type;
} GtkDragGetData;
static void
gtk_drag_get_data_finish (GtkDragGetData *data,
guchar *bytes,
gsize size)
{
GtkDragDestSite *site;
GtkSelectionData sdata;
site = g_object_get_data (G_OBJECT (data->widget), "gtk-drag-dest");
sdata.target = data->mime_type;
sdata.type = data->mime_type;
sdata.format = 8;
sdata.length = size;
sdata.data = bytes ? bytes : (guchar *)g_strdup ("");
sdata.display = gtk_widget_get_display (data->widget);
if (site && site->target_list)
{
if (gdk_content_formats_contain_mime_type (site->target_list, data->mime_type))
{
if (!(site->flags & GTK_DEST_DEFAULT_DROP) ||
size >= 0)
g_signal_emit_by_name (data->widget,
"drag-data-received",
data->drop,
&sdata);
}
}
else
{
g_signal_emit_by_name (data->widget,
"drag-data-received",
data->drop,
&sdata);
}
if (site && site->flags & GTK_DEST_DEFAULT_DROP)
{
GdkDragAction action = site->actions & gdk_drop_get_actions (data->drop);
if (size == 0)
action = 0;
if (!gdk_drag_action_is_unique (action))
{
if (action & GDK_ACTION_COPY)
action = GDK_ACTION_COPY;
else if (action & GDK_ACTION_MOVE)
action = GDK_ACTION_MOVE;
}
gdk_drop_finish (data->drop, action);
}
g_object_unref (data->widget);
g_object_unref (data->drop);
g_slice_free (GtkDragGetData, data);
}
static void
gtk_drag_get_data_got_data (GObject *source,
GAsyncResult *result,
gpointer data)
{
gssize written;
written = g_output_stream_splice_finish (G_OUTPUT_STREAM (source), result, NULL);
if (written < 0)
{
gtk_drag_get_data_finish (data, NULL, 0);
}
else
{
gtk_drag_get_data_finish (data,
g_memory_output_stream_get_data (G_MEMORY_OUTPUT_STREAM (source)),
g_memory_output_stream_get_data_size (G_MEMORY_OUTPUT_STREAM (source)));
}
}
static void
gtk_drag_get_data_got_stream (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GtkDragGetData *data = user_data;
GInputStream *input_stream;
GOutputStream *output_stream;
input_stream = gdk_drop_read_finish (GDK_DROP (source), result, &data->mime_type, NULL);
if (input_stream == NULL)
{
gtk_drag_get_data_finish (data, NULL, 0);
return;
}
output_stream = g_memory_output_stream_new_resizable ();
g_output_stream_splice_async (output_stream,
input_stream,
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE | G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
G_PRIORITY_DEFAULT,
NULL,
gtk_drag_get_data_got_data,
data);
g_object_unref (output_stream);
g_object_unref (input_stream);
}
/**
* gtk_drag_get_data: (method)
* @widget: the widget that will receive the
* #GtkWidget::drag-data-received signal
* @drop: the #GdkDrop
* @target: the target (form of the data) to retrieve
*
* Gets the data associated with a drag. When the data
* is received or the retrieval fails, GTK+ will emit a
* #GtkWidget::drag-data-received signal. Failure of the retrieval
* is indicated by the length field of the @selection_data
* signal parameter being negative. However, when gtk_drag_get_data()
* is called implicitely because the %GTK_DEST_DEFAULT_DROP was set,
* then the widget will not receive notification of failed
* drops.
*/
void
gtk_drag_get_data (GtkWidget *widget,
GdkDrop *drop,
GdkAtom target)
{
GtkDragGetData *data;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GDK_IS_DROP (drop));
data = g_slice_new0 (GtkDragGetData);
data->widget = g_object_ref (widget);
data->drop = g_object_ref (drop);
data->mime_type = target;
gdk_drop_read_async (drop,
(const gchar *[2]) { target, NULL },
G_PRIORITY_DEFAULT,
NULL,
gtk_drag_get_data_got_stream,
data);
}
/**
* gtk_drag_get_source_widget:
* @drag: a drag context
*
* Determines the source widget for a drag.
*
* Returns: (nullable) (transfer none): if the drag is occurring
* within a single application, a pointer to the source widget.
* Otherwise, %NULL.
*/
GtkWidget *
gtk_drag_get_source_widget (GdkDrag *drag)
{
GtkDragSourceInfo *info;
g_return_val_if_fail (GDK_IS_DRAG (drag), NULL);
info = gtk_drag_get_source_info (drag, FALSE);
if (info == NULL)
return NULL;
return info->widget;
}
/**
* gtk_drag_highlight: (method)
* @widget: a widget to highlight
*
* Highlights a widget as a currently hovered drop target.
* To end the highlight, call gtk_drag_unhighlight().
* GTK+ calls this automatically if %GTK_DEST_DEFAULT_HIGHLIGHT is set.
*/
void
gtk_drag_highlight (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_DROP_ACTIVE, FALSE);
}
/**
* gtk_drag_unhighlight: (method)
* @widget: a widget to remove the highlight from
*
* Removes a highlight set by gtk_drag_highlight() from
* a widget.
*/
void
gtk_drag_unhighlight (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_DROP_ACTIVE);
}
/*
* _gtk_drag_dest_handle_event:
* @toplevel: Toplevel widget that received the event
* @event: the event to handle
*
* Called from widget event handling code on Drag events
* for destinations.
*/
void
_gtk_drag_dest_handle_event (GtkWidget *toplevel,
GdkEvent *event)
{
GtkDragDestInfo *info;
GdkDrop *drop;
guint32 time;
GdkEventType event_type;
g_return_if_fail (toplevel != NULL);
g_return_if_fail (event != NULL);
event_type = gdk_event_get_event_type (event);
drop = gdk_event_get_drop (event);
time = gdk_event_get_time (event);
info = gtk_drag_get_dest_info (drop, TRUE);
/* Find the widget for the event */
switch ((guint) event_type)
{
case GDK_DRAG_ENTER:
break;
case GDK_DRAG_LEAVE:
if (info->widget)
{
gtk_drag_dest_leave (info->widget, drop, time);
gtk_drag_dest_set_widget (info, NULL);
}
break;
case GDK_DRAG_MOTION:
case GDK_DROP_START:
{
double x, y;
gboolean found;
if (event_type == GDK_DROP_START)
{
/* We send a leave here so that the widget unhighlights
* properly.
*/
if (info->widget)
{
gtk_drag_dest_leave (info->widget, drop, time);
gtk_drag_dest_set_widget (info, NULL);
}
}
gdk_event_get_coords (event, &x, &y);
found = gtk_drop_find_widget (toplevel,
drop,
info,
x,
y,
time,
(event_type == GDK_DRAG_MOTION) ?
gtk_drag_dest_motion :
gtk_drag_dest_drop);
if (info->widget && !found)
{
gtk_drag_dest_leave (info->widget, drop, time);
gtk_drag_dest_set_widget (info, NULL);
}
/* Send a reply.
*/
if (!found)
gdk_drop_status (drop, 0);
}
break;
default:
g_assert_not_reached ();
}
}
static gboolean
gtk_drop_find_widget (GtkWidget *event_widget,
GdkDrop *drop,
GtkDragDestInfo *info,
gint x,
gint y,
guint32 time,
GtkDragDestCallback callback)
{
GtkWidget *widget;
if (!gtk_widget_get_mapped (event_widget) ||
!gtk_widget_get_sensitive (event_widget))
return FALSE;
widget = gtk_widget_pick (event_widget, x, y, GTK_PICK_DEFAULT);
if (!widget)
return FALSE;
gtk_widget_translate_coordinates (event_widget, widget, x, y, &x, &y);
while (widget)
{
GtkWidget *parent;
GList *hierarchy = NULL;
gboolean found = FALSE;
if (!gtk_widget_get_mapped (widget))
return FALSE;
if (gtk_widget_get_state_flags (widget) & GTK_STATE_FLAG_INSENSITIVE)
{
widget = gtk_widget_get_parent (widget);
continue;
}
/* need to reference the entire hierarchy temporarily in case the
* ::drag-motion/::drag-drop callbacks change the widget hierarchy.
*/
for (parent = widget;
parent;
parent = gtk_widget_get_parent (parent))
{
hierarchy = g_list_prepend (hierarchy, g_object_ref (parent));
}
/* If the current widget is registered as a drop site, check to
* emit "drag-motion" to check if we are actually in a drop
* site.
*/
if (g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"))
{
found = callback (widget, drop, x, y, time);
/* If so, send a "drag-leave" to the last widget */
if (found && info->widget != widget)
{
if (info->widget)
gtk_drag_dest_leave (info->widget, drop, time);
gtk_drag_dest_set_widget (info, widget);
}
}
if (!found)
{
/* Get the parent before unreffing the hierarchy because
* invoking the callback might have destroyed the widget
*/
parent = gtk_widget_get_parent (widget);
/* The parent might be going away when unreffing the
* hierarchy, so also protect againt that
*/
if (parent)
g_object_add_weak_pointer (G_OBJECT (parent), (gpointer *) &parent);
}
g_list_free_full (hierarchy, g_object_unref);
if (found)
return TRUE;
if (parent)
g_object_remove_weak_pointer (G_OBJECT (parent), (gpointer *) &parent);
else
return FALSE;
if (!gtk_widget_translate_coordinates (widget, parent, x, y, &x, &y))
return FALSE;
widget = parent;
}
return FALSE;
}
static void
gtk_drag_dest_set_widget (GtkDragDestInfo *info,
GtkWidget *widget)
{
if (info->widget)
g_object_remove_weak_pointer (G_OBJECT (info->widget), (gpointer *) &info->widget);
info->widget = widget;
if (info->widget)
g_object_add_weak_pointer (G_OBJECT (info->widget), (gpointer *) &info->widget);
}
static void
gtk_drag_dest_info_destroy (gpointer data)
{
GtkDragDestInfo *info = (GtkDragDestInfo *)data;
gtk_drag_dest_set_widget (info, NULL);
g_slice_free (GtkDragDestInfo, data);
}
static GtkDragDestInfo *
gtk_drag_get_dest_info (GdkDrop *drop,
gboolean create)
{
GtkDragDestInfo *info;
static GQuark info_quark = 0;
if (!info_quark)
info_quark = g_quark_from_static_string ("gtk-dest-info");
info = g_object_get_qdata (G_OBJECT (drop), info_quark);
if (!info && create)
{
info = g_slice_new0 (GtkDragDestInfo);
info->drop = drop;
g_object_set_qdata_full (G_OBJECT (drop), info_quark,
info, gtk_drag_dest_info_destroy);
}
return info;
}
static GQuark dest_info_quark = 0;
static GtkDragSourceInfo *
gtk_drag_get_source_info (GdkDrag *drag,
gboolean create)
{
GtkDragSourceInfo *info;
if (!dest_info_quark)
dest_info_quark = g_quark_from_static_string ("gtk-source-info");
info = g_object_get_qdata (G_OBJECT (drag), dest_info_quark);
if (!info && create)
{
info = g_new0 (GtkDragSourceInfo, 1);
info->drag = drag;
g_object_set_qdata (G_OBJECT (drag), dest_info_quark, info);
}
return info;
}
static void
gtk_drag_clear_source_info (GdkDrag *drag)
{
g_object_set_qdata (G_OBJECT (drag), dest_info_quark, NULL);
}
/*
* Default drag handlers
*/
static void
gtk_drag_dest_leave (GtkWidget *widget,
GdkDrop *drop,
guint time)
{
GtkDragDestSite *site;
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
g_return_if_fail (site != NULL);
if ((site->flags & GTK_DEST_DEFAULT_HIGHLIGHT) && site->have_drag)
gtk_drag_unhighlight (widget);
if (!(site->flags & GTK_DEST_DEFAULT_MOTION) || site->have_drag ||
site->track_motion)
g_signal_emit_by_name (widget, "drag-leave", drop, time);
site->have_drag = FALSE;
}
static gboolean
gtk_drag_dest_motion (GtkWidget *widget,
GdkDrop *drop,
gint x,
gint y,
guint time)
{
GtkDragDestSite *site;
gboolean retval;
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
g_return_val_if_fail (site != NULL, FALSE);
if (site->track_motion || site->flags & GTK_DEST_DEFAULT_MOTION)
{
GdkDragAction actions;
actions = gdk_drop_get_actions (drop);
if ((actions & site->actions) == 0)
actions = 0;
if (actions && gtk_drag_dest_find_target (widget, drop, NULL))
{
if (!site->have_drag)
{
site->have_drag = TRUE;
if (site->flags & GTK_DEST_DEFAULT_HIGHLIGHT)
gtk_drag_highlight (widget);
}
gdk_drop_status (drop, site->actions);
}
else
{
gdk_drop_status (drop, 0);
if (!site->track_motion)
return TRUE;
}
}
g_signal_emit_by_name (widget, "drag-motion",
drop, x, y, &retval);
return (site->flags & GTK_DEST_DEFAULT_MOTION) ? TRUE : retval;
}
static gboolean
gtk_drag_dest_drop (GtkWidget *widget,
GdkDrop *drop,
gint x,
gint y,
guint time)
{
GtkDragDestSite *site;
GtkDragDestInfo *info;
gboolean retval;
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
g_return_val_if_fail (site != NULL, FALSE);
info = gtk_drag_get_dest_info (drop, FALSE);
g_return_val_if_fail (info != NULL, FALSE);
if (site->flags & GTK_DEST_DEFAULT_DROP)
{
GdkAtom target = gtk_drag_dest_find_target (widget, drop, NULL);
if (target == NULL)
{
gdk_drop_finish (drop, 0);
return TRUE;
}
else
gtk_drag_get_data (widget, drop, target);
}
g_signal_emit_by_name (widget, "drag-drop",
drop, x, y, &retval);
return (site->flags & GTK_DEST_DEFAULT_DROP) ? TRUE : retval;
}
/***************
* Source side *
***************/
#define GTK_TYPE_DRAG_CONTENT (gtk_drag_content_get_type ())
#define GTK_DRAG_CONTENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_DRAG_CONTENT, GtkDragContent))
#define GTK_IS_DRAG_CONTENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_DRAG_CONTENT))
#define GTK_DRAG_CONTENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_DRAG_CONTENT, GtkDragContentClass))
#define GTK_IS_DRAG_CONTENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_DRAG_CONTENT))
#define GTK_DRAG_CONTENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_DRAG_CONTENT, GtkDragContentClass))
typedef struct _GtkDragContent GtkDragContent;
typedef struct _GtkDragContentClass GtkDragContentClass;
struct _GtkDragContent
{
GdkContentProvider parent;
GtkWidget *widget;
GdkDrag *drag;
GdkContentFormats *formats;
guint32 time;
};
struct _GtkDragContentClass
{
GdkContentProviderClass parent_class;
};
GType gtk_drag_content_get_type (void) G_GNUC_CONST;
G_DEFINE_TYPE (GtkDragContent, gtk_drag_content, GDK_TYPE_CONTENT_PROVIDER)
static GdkContentFormats *
gtk_drag_content_ref_formats (GdkContentProvider *provider)
{
GtkDragContent *content = GTK_DRAG_CONTENT (provider);
return gdk_content_formats_ref (content->formats);
}
static void
gtk_drag_content_write_mime_type_done (GObject *stream,
GAsyncResult *result,
gpointer task)
{
GError *error = NULL;
if (!g_output_stream_write_all_finish (G_OUTPUT_STREAM (stream),
result,
NULL,
&error))
{
g_task_return_error (task, error);
}
else
{
g_task_return_boolean (task, TRUE);
}
g_object_unref (task);
}
static void
gtk_drag_content_write_mime_type_async (GdkContentProvider *provider,
const char *mime_type,
GOutputStream *stream,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GtkDragContent *content = GTK_DRAG_CONTENT (provider);
GtkSelectionData sdata = { 0, };
GTask *task;
task = g_task_new (content, cancellable, callback, user_data);
g_task_set_priority (task, io_priority);
g_task_set_source_tag (task, gtk_drag_content_write_mime_type_async);
sdata.target = g_intern_string (mime_type);
sdata.length = -1;
sdata.display = gtk_widget_get_display (content->widget);
g_signal_emit_by_name (content->widget, "drag-data-get",
content->drag,
&sdata);
if (sdata.length == -1)
{
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Cannot provide contents as “%s”"), mime_type);
g_object_unref (task);
return;
}
g_task_set_task_data (task, sdata.data, g_free);
g_output_stream_write_all_async (stream,
sdata.data,
sdata.length,
io_priority,
cancellable,
gtk_drag_content_write_mime_type_done,
task);
}
static gboolean
gtk_drag_content_write_mime_type_finish (GdkContentProvider *provider,
GAsyncResult *result,
GError **error)
{
g_return_val_if_fail (g_task_is_valid (result, provider), FALSE);
g_return_val_if_fail (g_task_get_source_tag (G_TASK (result)) == gtk_drag_content_write_mime_type_async, FALSE);
return g_task_propagate_boolean (G_TASK (result), error);
}
static void
gtk_drag_content_finalize (GObject *object)
{
GtkDragContent *content = GTK_DRAG_CONTENT (object);
g_clear_object (&content->widget);
g_clear_pointer (&content->formats, gdk_content_formats_unref);
G_OBJECT_CLASS (gtk_drag_content_parent_class)->finalize (object);
}
static void
gtk_drag_content_class_init (GtkDragContentClass *class)
{
GdkContentProviderClass *provider_class = GDK_CONTENT_PROVIDER_CLASS (class);
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = gtk_drag_content_finalize;
provider_class->ref_formats = gtk_drag_content_ref_formats;
provider_class->write_mime_type_async = gtk_drag_content_write_mime_type_async;
provider_class->write_mime_type_finish = gtk_drag_content_write_mime_type_finish;
}
static void
gtk_drag_content_init (GtkDragContent *content)
{
}
/* Like gtk_drag_begin(), but also takes a GtkImageDefinition
* so that we can set the icon from the source site information
*/
GdkDrag *
gtk_drag_begin_internal (GtkWidget *widget,
GdkDevice *device,
GtkImageDefinition *icon,
GdkContentFormats *target_list,
GdkDragAction actions,
int x,
int y)
{
GtkDragSourceInfo *info;
GtkNative *native;
GdkDrag *drag;
double px, py;
int dx, dy;
GtkDragContent *content;
if (gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD)
device = gdk_device_get_associated_device (device);
native = gtk_widget_get_native (widget);
gtk_widget_translate_coordinates (widget, GTK_WIDGET (native), x, y, &x, &y);
gdk_surface_get_device_position (gtk_native_get_surface (native),
device,
&px, &py,
NULL);
dx = round (px) - x;
dy = round (py) - y;
content = g_object_new (GTK_TYPE_DRAG_CONTENT, NULL);
content->widget = g_object_ref (widget);
content->formats = gdk_content_formats_ref (target_list);
drag = gdk_drag_begin (gtk_native_get_surface (native), device, GDK_CONTENT_PROVIDER (content), actions, dx, dy);
if (drag == NULL)
{
g_object_unref (content);
return NULL;
}
content->drag = drag;
g_object_unref (content);
info = gtk_drag_get_source_info (drag, TRUE);
g_object_set_data (G_OBJECT (widget), I_("gtk-info"), info);
info->widget = g_object_ref (widget);
info->target_list = target_list;
gdk_content_formats_ref (target_list);
info->icon_window = NULL;
info->icon_widget = NULL;
info->destroy_icon = FALSE;
gtk_widget_reset_controllers (widget);
g_signal_emit_by_name (widget, "drag-begin", info->drag);
/* Ensure that we have an icon before we start the drag; the
* application may have set one in ::drag_begin, or it may
* not have set one.
*/
if (!info->icon_widget)
{
if (icon)
{
set_icon_helper (info->drag, icon, 0, 0);
}
else
{
icon = gtk_image_definition_new_icon_name ("text-x-generic");
set_icon_helper (info->drag, icon, 0, 0);
gtk_image_definition_unref (icon);
}
}
g_signal_connect (drag, "drop-performed",
G_CALLBACK (gtk_drag_drop_performed_cb), info);
g_signal_connect (drag, "dnd-finished",
G_CALLBACK (gtk_drag_dnd_finished_cb), info);
g_signal_connect (drag, "cancel",
G_CALLBACK (gtk_drag_cancel_cb), info);
return info->drag;
}
/**
* gtk_drag_begin: (method)
* @widget: the source widget
* @device: (nullable): the device that starts the drag or %NULL to use the default pointer
* @targets: The targets (data formats) in which the source can provide the data
* @actions: A bitmask of the allowed drag actions for this drag
* @x: The initial x coordinate to start dragging from, in the coordinate space of @widget.
* @y: The initial y coordinate to start dragging from, in the coordinate space of @widget.
*
* Initiates a drag on the source side. The function only needs to be used
* when the application is starting drags itself, and is not needed when
* gtk_drag_source_set() is used.
*
* Returns: (transfer none): the context for this drag
*/
GdkDrag *
gtk_drag_begin (GtkWidget *widget,
GdkDevice *device,
GdkContentFormats *targets,
GdkDragAction actions,
gint x,
gint y)
{
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
g_return_val_if_fail (device == NULL || GDK_IS_DEVICE (device), NULL);
g_return_val_if_fail (gtk_widget_get_realized (widget), NULL);
g_return_val_if_fail (targets != NULL, NULL);
if (device == NULL)
{
GdkSeat *seat;
seat = gdk_display_get_default_seat (gtk_widget_get_display (widget));
device = gdk_seat_get_pointer (seat);
}
return gtk_drag_begin_internal (widget,
device,
NULL,
targets,
actions,
x, y);
}
static void
icon_widget_destroyed (GtkWidget *widget,
GtkDragSourceInfo *info)
{
g_clear_object (&info->icon_widget);
}
static void
gtk_drag_set_icon_widget_internal (GdkDrag *drag,
GtkWidget *widget,
gint hot_x,
gint hot_y,
gboolean destroy_on_release)
{
GtkDragSourceInfo *info;
g_return_if_fail (!GTK_IS_WINDOW (widget));
info = gtk_drag_get_source_info (drag, FALSE);
if (info == NULL)
{
if (destroy_on_release)
gtk_widget_destroy (widget);
return;
}
gtk_drag_remove_icon (info);
if (widget)
g_object_ref (widget);
info->icon_widget = widget;
info->destroy_icon = destroy_on_release;
if (!widget)
return;
g_signal_connect (widget, "destroy", G_CALLBACK (icon_widget_destroyed), info);
gdk_drag_set_hotspot (drag, hot_x, hot_y);
if (!info->icon_window)
{
info->icon_window = gtk_drag_icon_new ();
g_object_ref_sink (info->icon_window);
gtk_widget_set_size_request (info->icon_window, 24, 24);
gtk_drag_icon_set_surface (GTK_DRAG_ICON (info->icon_window),
gdk_drag_get_drag_surface (drag));
gtk_widget_show (info->icon_window);
}
gtk_drag_icon_set_widget (GTK_DRAG_ICON (info->icon_window), widget);
}
/**
* gtk_drag_set_icon_widget:
* @drag: the context for a drag
* @widget: a widget to use as an icon
* @hot_x: the X offset within @widget of the hotspot
* @hot_y: the Y offset within @widget of the hotspot
*
* Changes the icon for drag operation to a given widget.
* GTK+ will not destroy the widget, so if you don’t want
* it to persist, you should connect to the “drag-end”
* signal and destroy it yourself.
*/
void
gtk_drag_set_icon_widget (GdkDrag *drag,
GtkWidget *widget,
gint hot_x,
gint hot_y)
{
g_return_if_fail (GDK_IS_DRAG (drag));
g_return_if_fail (GTK_IS_WIDGET (widget));
gtk_drag_set_icon_widget_internal (drag, widget, hot_x, hot_y, FALSE);
}
static void
set_icon_helper (GdkDrag *drag,
GtkImageDefinition *def,
gint hot_x,
gint hot_y)
{
GtkWidget *widget;
widget = gtk_image_new ();
gtk_style_context_add_class (gtk_widget_get_style_context (widget), "drag-icon");
gtk_image_set_from_definition (GTK_IMAGE (widget), def);
gtk_drag_set_icon_widget_internal (drag, widget, hot_x, hot_y, TRUE);
}
void
gtk_drag_set_icon_definition (GdkDrag *drag,
GtkImageDefinition *def,
gint hot_x,
gint hot_y)
{
g_return_if_fail (GDK_IS_DRAG (drag));
g_return_if_fail (def != NULL);
set_icon_helper (drag, def, hot_x, hot_y);
}
/**
* gtk_drag_set_icon_paintable:
* @drag: the context for a drag
* @paintable: the #GdkPaintable to use as icon
* @hot_x: the X offset of the hotspot within the icon
* @hot_y: the Y offset of the hotspot within the icon
*
* Sets @paintable as the icon for a given drag. GTK+ retains
* references for the arguments, and will release them when
* they are no longer needed.
*
* To position the @paintable relative to the mouse, its top
* left will be positioned @hot_x, @hot_y pixels from the
* mouse cursor.
*/
void
gtk_drag_set_icon_paintable (GdkDrag *drag,
GdkPaintable *paintable,
int hot_x,
int hot_y)
{
GtkWidget *widget;
g_return_if_fail (GDK_IS_DRAG (drag));
g_return_if_fail (GDK_IS_PAINTABLE (paintable));
widget = gtk_picture_new_for_paintable (paintable);
gtk_picture_set_can_shrink (GTK_PICTURE (widget), FALSE);
gtk_drag_set_icon_widget_internal (drag, widget, hot_x, hot_y, TRUE);
}
/**
* gtk_drag_set_icon_name:
* @drag: the context for a drag
* @icon_name: name of icon to use
* @hot_x: the X offset of the hotspot within the icon
* @hot_y: the Y offset of the hotspot within the icon
*
* Sets the icon for a given drag from a named themed icon. See
* the docs for #GtkIconTheme for more details. Note that the
* size of the icon depends on the icon theme (the icon is
* loaded at the symbolic size #GTK_ICON_SIZE_DND), thus
* @hot_x and @hot_y have to be used with care.
*/
void
gtk_drag_set_icon_name (GdkDrag *drag,
const gchar *icon_name,
gint hot_x,
gint hot_y)
{
GtkImageDefinition *def;
g_return_if_fail (GDK_IS_DRAG (drag));
g_return_if_fail (icon_name != NULL && icon_name[0] != '\0');
def = gtk_image_definition_new_icon_name (icon_name);
set_icon_helper (drag, def, hot_x, hot_y);
gtk_image_definition_unref (def);
}
/**
* gtk_drag_set_icon_gicon:
* @drag: the context for a drag
* @icon: a #GIcon
* @hot_x: the X offset of the hotspot within the icon
* @hot_y: the Y offset of the hotspot within the icon
*
* Sets the icon for a given drag from the given @icon.
* See the documentation for gtk_drag_set_icon_name()
* for more details about using icons in drag and drop.
*/
void
gtk_drag_set_icon_gicon (GdkDrag *drag,
GIcon *icon,
gint hot_x,
gint hot_y)
{
GtkImageDefinition *def;
g_return_if_fail (GDK_IS_DRAG (drag));
g_return_if_fail (icon != NULL);
def = gtk_image_definition_new_gicon (icon);
set_icon_helper (drag, def, hot_x, hot_y);
gtk_image_definition_unref (def);
}
/**
* gtk_drag_set_icon_default:
* @drag: the context for a drag
*
* Sets the icon for a particular drag to the default
* icon.
*/
void
gtk_drag_set_icon_default (GdkDrag *drag)
{
g_return_if_fail (GDK_IS_DRAG (drag));
gtk_drag_set_icon_name (drag, "text-x-generic", -2, -2);
}
/* Clean up from the drag, and display snapback, if necessary. */
static void
gtk_drag_drop_finished (GtkDragSourceInfo *info,
GtkDragResult result)
{
gboolean success;
success = (result == GTK_DRAG_RESULT_SUCCESS);
if (!success)
g_signal_emit_by_name (info->widget, "drag-failed",
info->drag, result, &success);
gdk_drag_drop_done (info->drag, success);
gtk_drag_source_info_destroy (info);
}
static void
gtk_drag_drop (GtkDragSourceInfo *info)
{
if (info->icon_window)
gtk_widget_hide (info->icon_window);
info->drop_timeout = g_timeout_add (DROP_ABORT_TIME, gtk_drag_abort_timeout, info);
g_source_set_name_by_id (info->drop_timeout, "[gtk] gtk_drag_abort_timeout");
}
/*
* Source side callbacks.
*/
static void
gtk_drag_remove_icon (GtkDragSourceInfo *info)
{
if (info->icon_widget)
{
GtkWidget *widget;
widget = info->icon_widget;
info->icon_widget = NULL;
g_signal_handlers_disconnect_by_func (widget, icon_widget_destroyed, info);
gtk_widget_hide (widget);
gtk_widget_set_opacity (widget, 1.0);
if (info->destroy_icon)
gtk_widget_destroy (widget);
else
gtk_drag_icon_set_widget (GTK_DRAG_ICON (info->icon_window), NULL);
g_object_unref (widget);
}
}
static void
gtk_drag_source_info_free (GtkDragSourceInfo *info)
{
gtk_drag_remove_icon (info);
g_object_unref (info->icon_window);
g_free (info);
}
static void
gtk_drag_source_info_destroy (GtkDragSourceInfo *info)
{
g_signal_handlers_disconnect_by_func (info->drag, gtk_drag_drop_performed_cb, info);
g_signal_handlers_disconnect_by_func (info->drag, gtk_drag_dnd_finished_cb, info);
g_signal_handlers_disconnect_by_func (info->drag, gtk_drag_cancel_cb, info);
g_signal_emit_by_name (info->widget, "drag-end", info->drag);
g_object_set_data (G_OBJECT (info->widget), I_("gtk-info"), NULL);
g_clear_object (&info->widget);
gdk_content_formats_unref (info->target_list);
if (info->drop_timeout)
g_source_remove (info->drop_timeout);
/* keep the icon_window alive until the (possible) drag cancel animation is done */
g_object_set_data_full (G_OBJECT (info->drag), "former-gtk-source-info", info, (GDestroyNotify)gtk_drag_source_info_free);
gtk_drag_clear_source_info (info->drag);
g_object_unref (info->drag);
}
/* Called on cancellation of a drag, either by the user
* or programmatically.
*/
static void
gtk_drag_cancel_internal (GtkDragSourceInfo *info,
GtkDragResult result)
{
gtk_drag_drop_finished (info, result);
}
static void
gtk_drag_drop_performed_cb (GdkDrag *drag,
GtkDragSourceInfo *info)
{
gtk_drag_drop (info);
}
static void
gtk_drag_cancel_cb (GdkDrag *drag,
GdkDragCancelReason reason,
GtkDragSourceInfo *info)
{
GtkDragResult result;
switch (reason)
{
case GDK_DRAG_CANCEL_NO_TARGET:
result = GTK_DRAG_RESULT_NO_TARGET;
break;
case GDK_DRAG_CANCEL_USER_CANCELLED:
result = GTK_DRAG_RESULT_USER_CANCELLED;
break;
case GDK_DRAG_CANCEL_ERROR:
default:
result = GTK_DRAG_RESULT_ERROR;
break;
}
gtk_drag_cancel_internal (info, result);
}
static void
gtk_drag_dnd_finished_cb (GdkDrag *drag,
GtkDragSourceInfo *info)
{
if (gdk_drag_get_selected_action (drag) == GDK_ACTION_MOVE)
{
g_signal_emit_by_name (info->widget,
"drag-data-delete",
drag);
}
gtk_drag_source_info_destroy (info);
}
static gboolean
gtk_drag_abort_timeout (gpointer data)
{
GtkDragSourceInfo *info = data;
info->drop_timeout = 0;
gtk_drag_drop_finished (info, GTK_DRAG_RESULT_TIMEOUT_EXPIRED);
return G_SOURCE_REMOVE;
}
/**
* gtk_drag_check_threshold: (method)
* @widget: a #GtkWidget
* @start_x: X coordinate of start of drag
* @start_y: Y coordinate of start of drag
* @current_x: current X coordinate
* @current_y: current Y coordinate
*
* Checks to see if a mouse drag starting at (@start_x, @start_y) and ending
* at (@current_x, @current_y) has passed the GTK+ drag threshold, and thus
* should trigger the beginning of a drag-and-drop operation.
*
* Returns: %TRUE if the drag threshold has been passed.
*/
gboolean
gtk_drag_check_threshold (GtkWidget *widget,
gint start_x,
gint start_y,
gint current_x,
gint current_y)
{
gint drag_threshold;
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
drag_threshold = gtk_settings_get_dnd_drag_threshold (gtk_widget_get_settings (widget));
return (ABS (current_x - start_x) > drag_threshold ||
ABS (current_y - start_y) > drag_threshold);
}
/**
* gtk_drag_cancel:
* @drag: a drag context, as e.g. returned by gtk_drag_begin()
*
* Cancels an ongoing drag operation on the source side.
*
* If you want to be able to cancel a drag operation in this way,
* you need to keep a pointer to the drag context, either from an
* explicit call to gtk_drag_begin(), or by connecting to
* #GtkWidget::drag-begin.
*
* If @context does not refer to an ongoing drag operation, this
* function does nothing.
*
* If a drag is cancelled in this way, the @result argument of
* #GtkWidget::drag-failed is set to @GTK_DRAG_RESULT_ERROR.
*/
void
gtk_drag_cancel (GdkDrag *drag)
{
GtkDragSourceInfo *info;
g_return_if_fail (GDK_IS_DRAG (drag));
info = gtk_drag_get_source_info (drag, FALSE);
if (info != NULL)
gtk_drag_cancel_internal (info, GTK_DRAG_RESULT_ERROR);
}
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