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.
22 #include "gtktreednd.h"
25 gtk_tree_drag_source_get_type (void)
27 static GType our_type = 0;
31 static const GTypeInfo our_info =
33 sizeof (GtkTreeDragSourceIface), /* class_size */
35 NULL, /* base_finalize */
37 NULL, /* class_finalize */
38 NULL, /* class_data */
44 our_type = g_type_register_static (G_TYPE_INTERFACE, "GtkTreeDragSource",
53 gtk_tree_drag_dest_get_type (void)
55 static GType our_type = 0;
59 static const GTypeInfo our_info =
61 sizeof (GtkTreeDragDestIface), /* class_size */
63 NULL, /* base_finalize */
65 NULL, /* class_finalize */
66 NULL, /* class_data */
72 our_type = g_type_register_static (G_TYPE_INTERFACE, "GtkTreeDragDest", &our_info, 0);
79 * gtk_tree_drag_source_row_draggable:
80 * @drag_source: a #GtkTreeDragSource
81 * @path: row on which user is initiating a drag
83 * Asks the #GtkTreeDragSource whether a particular row can be used as
84 * the source of a DND operation. If the source doesn't implement
85 * this interface, the row is assumed draggable.
87 * Return value: %TRUE if the row can be dragged
90 gtk_tree_drag_source_row_draggable (GtkTreeDragSource *drag_source,
93 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
95 g_return_val_if_fail (path != NULL, FALSE);
97 if (iface->row_draggable)
98 return (* iface->row_draggable) (drag_source, path);
101 /* Returning TRUE if row_draggable is not implemented is a fallback.
102 Interface implementations such as GtkTreeStore and GtkListStore really should
103 implement row_draggable. */
108 * gtk_tree_drag_source_drag_data_delete:
109 * @drag_source: a #GtkTreeDragSource
110 * @path: row that was being dragged
112 * Asks the #GtkTreeDragSource to delete the row at @path, because
113 * it was moved somewhere else via drag-and-drop. Returns %FALSE
114 * if the deletion fails because @path no longer exists, or for
115 * some model-specific reason. Should robustly handle a @path no
116 * longer found in the model!
118 * Return value: %TRUE if the row was successfully deleted
121 gtk_tree_drag_source_drag_data_delete (GtkTreeDragSource *drag_source,
124 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
126 g_return_val_if_fail (iface->drag_data_delete != NULL, FALSE);
127 g_return_val_if_fail (path != NULL, FALSE);
129 return (* iface->drag_data_delete) (drag_source, path);
133 * gtk_tree_drag_source_drag_data_get:
134 * @drag_source: a #GtkTreeDragSource
135 * @path: row that was dragged
136 * @selection_data: a #GtkSelectionData to fill with data from the dragged row
138 * Asks the #GtkTreeDragSource to fill in @selection_data with a
139 * representation of the row at @path. @selection_data->target gives
140 * the required type of the data. Should robustly handle a @path no
141 * longer found in the model!
143 * Return value: %TRUE if data of the required type was provided
146 gtk_tree_drag_source_drag_data_get (GtkTreeDragSource *drag_source,
148 GtkSelectionData *selection_data)
150 GtkTreeDragSourceIface *iface = GTK_TREE_DRAG_SOURCE_GET_IFACE (drag_source);
152 g_return_val_if_fail (iface->drag_data_get != NULL, FALSE);
153 g_return_val_if_fail (path != NULL, FALSE);
154 g_return_val_if_fail (selection_data != NULL, FALSE);
156 return (* iface->drag_data_get) (drag_source, path, selection_data);
160 * gtk_tree_drag_dest_drag_data_received:
161 * @drag_dest: a #GtkTreeDragDest
162 * @dest: row to drop in front of
163 * @selection_data: data to drop
165 * Asks the #GtkTreeDragDest to insert a row before the path @dest,
166 * deriving the contents of the row from @selection_data. If @dest is
167 * outside the tree so that inserting before it is impossible, %FALSE
168 * will be returned. Also, %FALSE may be returned if the new row is
169 * not created for some model-specific reason. Should robustly handle
170 * a @dest no longer found in the model!
172 * Return value: whether a new row was created before position @dest
175 gtk_tree_drag_dest_drag_data_received (GtkTreeDragDest *drag_dest,
177 GtkSelectionData *selection_data)
179 GtkTreeDragDestIface *iface = GTK_TREE_DRAG_DEST_GET_IFACE (drag_dest);
181 g_return_val_if_fail (iface->drag_data_received != NULL, FALSE);
182 g_return_val_if_fail (dest != NULL, FALSE);
183 g_return_val_if_fail (selection_data != NULL, FALSE);
185 return (* iface->drag_data_received) (drag_dest, dest, selection_data);
190 * gtk_tree_drag_dest_row_drop_possible:
191 * @drag_dest: a #GtkTreeDragDest
192 * @dest_path: destination row
193 * @selection_data: the data being dragged
195 * Determines whether a drop is possible before the given @dest_path,
196 * at the same depth as @dest_path. i.e., can we drop the data in
197 * @selection_data at that location. @dest_path does not have to
198 * exist; the return value will almost certainly be %FALSE if the
199 * parent of @dest_path doesn't exist, though.
201 * Return value: %TRUE if a drop is possible before @dest_path
204 gtk_tree_drag_dest_row_drop_possible (GtkTreeDragDest *drag_dest,
205 GtkTreePath *dest_path,
206 GtkSelectionData *selection_data)
208 GtkTreeDragDestIface *iface = GTK_TREE_DRAG_DEST_GET_IFACE (drag_dest);
210 g_return_val_if_fail (iface->row_drop_possible != NULL, FALSE);
211 g_return_val_if_fail (selection_data != NULL, FALSE);
212 g_return_val_if_fail (dest_path != NULL, FALSE);
214 return (* iface->row_drop_possible) (drag_dest, dest_path, selection_data);
217 typedef struct _TreeRowData TreeRowData;
226 * gtk_tree_set_row_drag_data:
227 * @selection_data: some #GtkSelectionData
228 * @tree_model: a #GtkTreeModel
229 * @path: a row in @tree_model
231 * Sets selection data of target type %GTK_TREE_MODEL_ROW. Normally used
232 * in a drag_data_get handler.
234 * Return value: %TRUE if the #GtkSelectionData had the proper target type to allow us to set a tree row
237 gtk_tree_set_row_drag_data (GtkSelectionData *selection_data,
238 GtkTreeModel *tree_model,
246 g_return_val_if_fail (selection_data != NULL, FALSE);
247 g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
248 g_return_val_if_fail (path != NULL, FALSE);
250 if (selection_data->target != gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE))
253 path_str = gtk_tree_path_to_string (path);
255 len = strlen (path_str);
257 /* the old allocate-end-of-struct-to-hold-string trick */
258 struct_size = sizeof (TreeRowData) + len + 1 -
259 (sizeof (TreeRowData) - G_STRUCT_OFFSET (TreeRowData, path));
261 trd = g_malloc (struct_size);
263 strcpy (trd->path, path_str);
267 trd->model = tree_model;
269 gtk_selection_data_set (selection_data,
270 gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE),
281 * gtk_tree_get_row_drag_data:
282 * @selection_data: a #GtkSelectionData
283 * @tree_model: a #GtkTreeModel
284 * @path: row in @tree_model
286 * Obtains a @tree_model and @path from selection data of target type
287 * %GTK_TREE_MODEL_ROW. Normally called from a drag_data_received handler.
288 * This function can only be used if @selection_data originates from the same
289 * process that's calling this function, because a pointer to the tree model
290 * is being passed around. If you aren't in the same process, then you'll
291 * get memory corruption. In the #GtkTreeDragDest drag_data_received handler,
292 * you can assume that selection data of type %GTK_TREE_MODEL_ROW is
293 * in from the current process. The returned path must be freed with
294 * gtk_tree_path_free().
296 * Return value: %TRUE if @selection_data had target type %GTK_TREE_MODEL_ROW and
300 gtk_tree_get_row_drag_data (GtkSelectionData *selection_data,
301 GtkTreeModel **tree_model,
306 g_return_val_if_fail (selection_data != NULL, FALSE);
314 if (selection_data->target != gdk_atom_intern ("GTK_TREE_MODEL_ROW", FALSE))
317 if (selection_data->length < 0)
320 trd = (void*) selection_data->data;
323 *tree_model = trd->model;
326 *path = gtk_tree_path_new_from_string (trd->path);