2 * Copyright (C) 2001 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
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 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 #include "gtktreednd.h"
24 gtk_tree_drag_source_get_type (void)
26 static GType our_type = 0;
30 static const GTypeInfo our_info =
32 sizeof (GtkTreeDragSourceIface), /* class_size */
34 NULL, /* base_finalize */
36 NULL, /* class_finalize */
37 NULL, /* class_data */
43 our_type = g_type_register_static (G_TYPE_INTERFACE, "GtkTreeDragSource",
52 gtk_tree_drag_dest_get_type (void)
54 static GType our_type = 0;
58 static const GTypeInfo our_info =
60 sizeof (GtkTreeDragDestIface), /* class_size */
62 NULL, /* base_finalize */
64 NULL, /* class_finalize */
65 NULL, /* class_data */
71 our_type = g_type_register_static (G_TYPE_INTERFACE, "GtkTreeDragDest", &our_info, 0);
78 * gtk_tree_drag_source_row_draggable:
79 * @drag_source: a #GtkTreeDragSource
80 * @path: row on which user is initiating a drag
82 * Asks the #GtkTreeDragSource whether a particular row can be used as
83 * the source of a DND operation. If the source doesn't implement
84 * this interface, the row is assumed draggable.
86 * Return value: %TRUE if the row can be dragged
89 gtk_tree_drag_source_row_draggable (GtkTreeDragSource *drag_source,
92 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
94 g_return_val_if_fail (path != NULL, FALSE);
96 if (iface->row_draggable)
97 return (* iface->row_draggable) (drag_source, path);
100 /* Returning TRUE if row_draggable is not implemented is a fallback.
101 Interface implementations such as GtkTreeStore and GtkListStore really should
102 implement row_draggable. */
107 * gtk_tree_drag_source_drag_data_delete:
108 * @drag_source: a #GtkTreeDragSource
109 * @path: row that was being dragged
111 * Asks the #GtkTreeDragSource to delete the row at @path, because
112 * it was moved somewhere else via drag-and-drop. Returns %FALSE
113 * if the deletion fails because @path no longer exists, or for
114 * some model-specific reason. Should robustly handle a @path no
115 * longer found in the model!
117 * Return value: %TRUE if the row was successfully deleted
120 gtk_tree_drag_source_drag_data_delete (GtkTreeDragSource *drag_source,
123 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
125 g_return_val_if_fail (iface->drag_data_delete != NULL, FALSE);
126 g_return_val_if_fail (path != NULL, FALSE);
128 return (* iface->drag_data_delete) (drag_source, path);
132 * gtk_tree_drag_source_drag_data_get:
133 * @drag_source: a #GtkTreeDragSource
134 * @path: row that was dragged
135 * @selection_data: a #GtkSelectionData to fill with data from the dragged row
137 * Asks the #GtkTreeDragSource to fill in @selection_data with a
138 * representation of the row at @path. @selection_data->target gives
139 * the required type of the data. Should robustly handle a @path no
140 * longer found in the model!
142 * Return value: %TRUE if data of the required type was provided
145 gtk_tree_drag_source_drag_data_get (GtkTreeDragSource *drag_source,
147 GtkSelectionData *selection_data)
149 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
151 g_return_val_if_fail (iface->drag_data_get != NULL, FALSE);
152 g_return_val_if_fail (path != NULL, FALSE);
153 g_return_val_if_fail (selection_data != NULL, FALSE);
155 return (* iface->drag_data_get) (drag_source, path, selection_data);
159 * gtk_tree_drag_dest_drag_data_received:
160 * @drag_dest: a #GtkTreeDragDest
161 * @dest: row to drop in front of
162 * @selection_data: data to drop
164 * Asks the #GtkTreeDragDest to insert a row before the path @dest,
165 * deriving the contents of the row from @selection_data. If @dest is
166 * outside the tree so that inserting before it is impossible, %FALSE
167 * will be returned. Also, %FALSE may be returned if the new row is
168 * not created for some model-specific reason. Should robustly handle
169 * a @dest no longer found in the model!
171 * Return value: whether a new row was created before position @dest
174 gtk_tree_drag_dest_drag_data_received (GtkTreeDragDest *drag_dest,
176 GtkSelectionData *selection_data)
178 GtkTreeDragDestIface *iface = GTK_TREE_DRAG_DEST_GET_IFACE (drag_dest);
180 g_return_val_if_fail (iface->drag_data_received != NULL, FALSE);
181 g_return_val_if_fail (dest != NULL, FALSE);
182 g_return_val_if_fail (selection_data != NULL, FALSE);
184 return (* iface->drag_data_received) (drag_dest, dest, selection_data);
189 * gtk_tree_drag_dest_row_drop_possible:
190 * @drag_dest: a #GtkTreeDragDest
191 * @dest_path: destination row
192 * @selection_data: the data being dragged
194 * Determines whether a drop is possible before the given @dest_path,
195 * at the same depth as @dest_path. i.e., can we drop the data in
196 * @selection_data at that location. @dest_path does not have to
197 * exist; the return value will almost certainly be %FALSE if the
198 * parent of @dest_path doesn't exist, though.
200 * Return value: %TRUE if a drop is possible before @dest_path
203 gtk_tree_drag_dest_row_drop_possible (GtkTreeDragDest *drag_dest,
204 GtkTreePath *dest_path,
205 GtkSelectionData *selection_data)
207 GtkTreeDragDestIface *iface = GTK_TREE_DRAG_DEST_GET_IFACE (drag_dest);
209 g_return_val_if_fail (iface->row_drop_possible != NULL, FALSE);
210 g_return_val_if_fail (selection_data != NULL, FALSE);
211 g_return_val_if_fail (dest_path != NULL, FALSE);
213 return (* iface->row_drop_possible) (drag_dest, dest_path, selection_data);
216 typedef struct _TreeRowData TreeRowData;
225 * gtk_tree_set_row_drag_data:
226 * @selection_data: some #GtkSelectionData
227 * @tree_model: a #GtkTreeModel
228 * @path: a row in @tree_model
230 * Sets selection data of target type %GTK_TREE_MODEL_ROW. Normally used
231 * in a drag_data_get handler.
233 * Return value: %TRUE if the #GtkSelectionData had the proper target type to allow us to set a tree row
236 gtk_tree_set_row_drag_data (GtkSelectionData *selection_data,
237 GtkTreeModel *tree_model,
245 g_return_val_if_fail (selection_data != NULL, FALSE);
246 g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
247 g_return_val_if_fail (path != NULL, FALSE);
249 if (selection_data->target != gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE))
252 path_str = gtk_tree_path_to_string (path);
254 len = strlen (path_str);
256 /* the old allocate-end-of-struct-to-hold-string trick */
257 struct_size = sizeof (TreeRowData) + len + 1 -
258 (sizeof (TreeRowData) - G_STRUCT_OFFSET (TreeRowData, path));
260 trd = g_malloc (struct_size);
262 strcpy (trd->path, path_str);
266 trd->model = tree_model;
268 gtk_selection_data_set (selection_data,
269 gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE),
280 * gtk_tree_get_row_drag_data:
281 * @selection_data: a #GtkSelectionData
282 * @tree_model: a #GtkTreeModel
283 * @path: row in @tree_model
285 * Obtains a @tree_model and @path from selection data of target type
286 * %GTK_TREE_MODEL_ROW. Normally called from a drag_data_received handler.
287 * This function can only be used if @selection_data originates from the same
288 * process that's calling this function, because a pointer to the tree model
289 * is being passed around. If you aren't in the same process, then you'll
290 * get memory corruption. In the #GtkTreeDragDest drag_data_received handler,
291 * you can assume that selection data of type %GTK_TREE_MODEL_ROW is
292 * in from the current process. The returned path must be freed with
293 * gtk_tree_path_free().
295 * Return value: %TRUE if @selection_data had target type %GTK_TREE_MODEL_ROW and
299 gtk_tree_get_row_drag_data (GtkSelectionData *selection_data,
300 GtkTreeModel **tree_model,
305 g_return_val_if_fail (selection_data != NULL, FALSE);
313 if (selection_data->target != gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE))
316 if (selection_data->length < 0)
319 trd = (void*) selection_data->data;
322 *tree_model = trd->model;
325 *path = gtk_tree_path_new_from_string (trd->path);