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", &our_info, 0);
51 gtk_tree_drag_dest_get_type (void)
53 static GType our_type = 0;
57 static const GTypeInfo our_info =
59 sizeof (GtkTreeDragDestIface), /* class_size */
61 NULL, /* base_finalize */
63 NULL, /* class_finalize */
64 NULL, /* class_data */
70 our_type = g_type_register_static (G_TYPE_INTERFACE, "GtkTreeDragDest", &our_info, 0);
77 * gtk_tree_drag_source_row_draggable:
78 * @drag_source: a #GtkTreeDragSource
79 * @path: row on which user is initiating a drag
81 * Asks the #GtkTreeDragSource whether a particular row can be used as
82 * the source of a DND operation. If the source doesn't implement
83 * this interface, the row is assumed draggable.
85 * Return value: %TRUE if the row can be dragged
88 gtk_tree_drag_source_row_draggable (GtkTreeDragSource *drag_source,
91 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
93 g_return_val_if_fail (path != NULL, FALSE);
95 if (iface->row_draggable)
96 return (* iface->row_draggable) (drag_source, path);
103 * gtk_tree_drag_source_drag_data_delete:
104 * @drag_source: a #GtkTreeDragSource
105 * @path: row that was being dragged
107 * Asks the #GtkTreeDragSource to delete the row at @path, because
108 * it was moved somewhere else via drag-and-drop. Returns %FALSE
109 * if the deletion fails because @path no longer exists, or for
110 * some model-specific reason. Should robustly handle a @path no
111 * longer found in the model!
113 * Return value: %TRUE if the row was successfully deleted
116 gtk_tree_drag_source_drag_data_delete (GtkTreeDragSource *drag_source,
119 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
121 g_return_val_if_fail (iface->drag_data_delete != NULL, FALSE);
122 g_return_val_if_fail (path != NULL, FALSE);
124 return (* iface->drag_data_delete) (drag_source, path);
128 * gtk_tree_drag_source_drag_data_get:
129 * @drag_source: a #GtkTreeDragSource
130 * @path: row that was dragged
131 * @selection_data: a #GtkSelectionData to fill with data from the dragged row
133 * Asks the #GtkTreeDragSource to fill in @selection_data with a
134 * representation of the row at @path. @selection_data->target gives
135 * the required type of the data. Should robustly handle a @path no
136 * longer found in the model!
138 * Return value: %TRUE if data of the required type was provided
141 gtk_tree_drag_source_drag_data_get (GtkTreeDragSource *drag_source,
143 GtkSelectionData *selection_data)
145 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
147 g_return_val_if_fail (iface->drag_data_get != NULL, FALSE);
148 g_return_val_if_fail (path != NULL, FALSE);
149 g_return_val_if_fail (selection_data != NULL, FALSE);
151 return (* iface->drag_data_get) (drag_source, path, selection_data);
155 * gtk_tree_drag_dest_drag_data_received:
156 * @drag_dest: a #GtkTreeDragDest
157 * @dest: row to drop in front of
158 * @selection_data: data to drop
160 * Asks the #GtkTreeDragDest to insert a row before the path @dest,
161 * deriving the contents of the row from @selection_data. If @dest is
162 * outside the tree so that inserting before it is impossible, %FALSE
163 * will be returned. Also, %FALSE may be returned if the new row is
164 * not created for some model-specific reason. Should robustly handle
165 * a @dest no longer found in the model!
167 * Return value: whether a new row was created before position @dest
170 gtk_tree_drag_dest_drag_data_received (GtkTreeDragDest *drag_dest,
172 GtkSelectionData *selection_data)
174 GtkTreeDragDestIface *iface = GTK_TREE_DRAG_DEST_GET_IFACE (drag_dest);
176 g_return_val_if_fail (iface->drag_data_received != NULL, FALSE);
177 g_return_val_if_fail (dest != NULL, FALSE);
178 g_return_val_if_fail (selection_data != NULL, FALSE);
180 return (* iface->drag_data_received) (drag_dest, dest, selection_data);
185 * gtk_tree_drag_dest_drop_possible:
186 * @drag_dest: a #GtkTreeDragDest
187 * @dest_path: destination row
188 * @selection_data: the data being dragged
190 * Determines whether a drop is possible before the given @dest_path,
191 * at the same depth as @dest_path. i.e., can we drop the data in
192 * @selection_data at that location. @dest_path does not have to
193 * exist; the return value will almost certainly be %FALSE if the
194 * parent of @dest_path doesn't exist, though.
196 * Return value: %TRUE if a drop is possible before @dest_path
199 gtk_tree_drag_dest_row_drop_possible (GtkTreeDragDest *drag_dest,
200 GtkTreePath *dest_path,
201 GtkSelectionData *selection_data)
203 GtkTreeDragDestIface *iface = GTK_TREE_DRAG_DEST_GET_IFACE (drag_dest);
205 g_return_val_if_fail (iface->row_drop_possible != NULL, FALSE);
206 g_return_val_if_fail (selection_data != NULL, FALSE);
207 g_return_val_if_fail (dest_path != NULL, FALSE);
209 return (* iface->row_drop_possible) (drag_dest, dest_path, selection_data);
212 typedef struct _TreeRowData TreeRowData;
221 * gtk_tree_set_row_drag_data:
222 * @selection_data: some #GtkSelectionData
223 * @tree_model: a #GtkTreeModel
224 * @path: a row in @tree_model
226 * Sets selection data of target type %GTK_TREE_MODEL_ROW. Normally used
227 * in a drag_data_get handler.
229 * Return value: %TRUE if the #GtkSelectionData had the proper target type to allow us to set a tree row
232 gtk_tree_set_row_drag_data (GtkSelectionData *selection_data,
233 GtkTreeModel *tree_model,
241 g_return_val_if_fail (selection_data != NULL, FALSE);
242 g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
243 g_return_val_if_fail (path != NULL, FALSE);
245 if (selection_data->target != gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE))
248 path_str = gtk_tree_path_to_string (path);
250 len = strlen (path_str);
252 /* the old allocate-end-of-struct-to-hold-string trick */
253 struct_size = sizeof (TreeRowData) + len + 1 -
254 (sizeof (TreeRowData) - G_STRUCT_OFFSET (TreeRowData, path));
256 trd = g_malloc (struct_size);
258 strcpy (trd->path, path_str);
262 trd->model = tree_model;
264 gtk_selection_data_set (selection_data,
265 gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE),
276 * gtk_tree_get_row_drag_data:
277 * @selection_data: a #GtkSelectionData
278 * @tree_model: a #GtkTreeModel
279 * @path: row in @tree_model
281 * Obtains a @tree_model and @path from selection data of target type
282 * %GTK_TREE_MODEL_ROW. Normally called from a drag_data_received handler.
283 * This function can only be used if @selection_data originates from the same
284 * process that's calling this function, because a pointer to the tree model
285 * is being passed around. If you aren't in the same process, then you'll
286 * get memory corruption. In the #GtkTreeDragDest drag_data_received handler,
287 * you can assume that selection data of type %GTK_TREE_MODEL_ROW is
288 * in from the current process. The returned path must be freed with
289 * gtk_tree_path_free().
291 * Return value: %TRUE if @selection_data had target type %GTK_TREE_MODEL_ROW and
295 gtk_tree_get_row_drag_data (GtkSelectionData *selection_data,
296 GtkTreeModel **tree_model,
301 g_return_val_if_fail (selection_data != NULL, FALSE);
309 if (selection_data->target != gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE))
312 trd = (void*) selection_data->data;
315 *tree_model = trd->model;
318 *path = gtk_tree_path_new_from_string (trd->path);