1/*
2 * Copyright © 2020 Benjamin Otte
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
16 *
17 * Authors: Benjamin Otte <otte@gnome.org>
18 */
19
20#include "config.h"
21
22#include "gtkdropprivate.h"
23
24typedef struct _GtkDrop GtkDrop;
25
26struct _GtkDrop
27{
28 /* TRUE if we are waiting for a gdk_drop_status() call */
29 gboolean waiting;
30 /* TRUE if begin_event() has been called but end_event() hasn't yet - purely for debugging */
31 gboolean active;
32};
33
34static void
35gtk_drop_free (gpointer data)
36{
37 GtkDrop *self = data;
38
39 g_slice_free (GtkDrop, self);
40}
41
42static GtkDrop *
43gtk_drop_lookup (GdkDrop *drop)
44{
45 static GQuark drop_quark = 0;
46 GtkDrop *result;
47
48 if (G_UNLIKELY (drop_quark == 0))
49 drop_quark = g_quark_from_string (string: "-gtk-drop-data");
50
51 result = g_object_get_qdata (G_OBJECT (drop), quark: drop_quark);
52 if (result == NULL)
53 {
54 result = g_slice_new0 (GtkDrop);
55 g_object_set_qdata_full (G_OBJECT (drop), quark: drop_quark, data: result, destroy: gtk_drop_free);
56 }
57
58 return result;
59}
60
61void
62gtk_drop_begin_event (GdkDrop *drop,
63 GdkEventType event_type)
64{
65 GtkDrop *self;
66
67 self = gtk_drop_lookup (drop);
68
69 g_assert (self->waiting == FALSE);
70 g_assert (self->active == FALSE);
71
72 self->active = TRUE;
73 if (event_type == GDK_DRAG_ENTER ||
74 event_type == GDK_DRAG_MOTION)
75 self->waiting = TRUE;
76}
77
78void
79gtk_drop_end_event (GdkDrop *drop)
80{
81 GtkDrop *self;
82
83 self = gtk_drop_lookup (drop);
84
85 g_assert (self->active == TRUE);
86
87 if (self->waiting)
88 {
89 gdk_drop_status (self: drop, actions: 0, preferred: 0);
90 self->waiting = FALSE;
91 }
92 self->active = FALSE;
93}
94
95gboolean
96gtk_drop_status (GdkDrop *drop,
97 GdkDragAction actions,
98 GdkDragAction preferred_action)
99{
100 GtkDrop *self;
101
102 self = gtk_drop_lookup (drop);
103
104 g_assert (self->active == TRUE);
105
106 if (!self->waiting)
107 return FALSE;
108
109 gdk_drop_status (self: drop, actions, preferred: preferred_action);
110 self->waiting = FALSE;
111 return TRUE;
112}
113
114

source code of gtk/gtk/gtkdrop.c