shell/ev-sidebar-links.c

   1 /* this file is part of evince, a gnome document viewer
   2  *
   3  *  Copyright (C) 2004 Red Hat, Inc.
   4  *
   5  *  Author:
   6  *    Jonathan Blandford <jrb@alum.mit.edu>
   7  *
   8  * Evince is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * Evince is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <string.h>
  28 #include <gtk/gtk.h>
  29
  30 #include "ev-sidebar-links.h"
  31 #include "ev-document-links.h"
  32 #include "ev-application.h"
  33
  34 /* Amount of time we devote to each iteration of the idle, in microseconds */
  35 #define IDLE_WORK_LENGTH 5000
  36
  37 typedef struct {
  38         EvDocumentLinksIter *links_iter;
  39         GtkTreeIter *tree_iter;
  40 } IdleStackData;
  41
  42 struct _EvSidebarLinksPrivate {
  43         GtkWidget *tree_view;
  44         GtkTreeModel *model;
  45         EvDocument *current_document;
  46         GList *idle_stack;
  47         guint idle_id;
  48 };
  49
  50 enum {
  51         LINKS_COLUMN_MARKUP,
  52         LINKS_COLUMN_PAGE_NUM,
  53         LINKS_COLUMN_PAGE_VALID,
  54         LINKS_COLUMN_LINK,
  55         LINKS_COLUMN_NUM_COLUMNS
  56 };
  57
  58 static void links_page_num_func (GtkTreeViewColumn *tree_column,
  59                                  GtkCellRenderer   *cell,
  60                                  GtkTreeModel      *tree_model,
  61                                  GtkTreeIter       *iter,
  62                                  gpointer           data);
  63
  64 G_DEFINE_TYPE (EvSidebarLinks, ev_sidebar_links, GTK_TYPE_VBOX)
  65
  66 #define EV_SIDEBAR_LINKS_GET_PRIVATE(object) \
  67         (G_TYPE_INSTANCE_GET_PRIVATE ((object), EV_TYPE_SIDEBAR_LINKS, EvSidebarLinksPrivate))
  68
  69
  70 static void
  71 ev_sidebar_links_destroy (GtkObject *object)
  72 {
  73         EvSidebarLinks *ev_sidebar_links = (EvSidebarLinks *) object;
  74
  75         g_print ("ev_sidebar_links_destroy!\n");
  76         ev_sidebar_links_clear_document (ev_sidebar_links);
  77 }
  78
  79 static void
  80 ev_sidebar_links_class_init (EvSidebarLinksClass *ev_sidebar_links_class)
  81 {
  82         GObjectClass *g_object_class;
  83         GtkObjectClass *gtk_object_class;
  84
  85         g_object_class = G_OBJECT_CLASS (ev_sidebar_links_class);
  86         gtk_object_class = GTK_OBJECT_CLASS (ev_sidebar_links_class);
  87
  88         gtk_object_class->destroy = ev_sidebar_links_destroy;
  89
  90         g_type_class_add_private (g_object_class, sizeof (EvSidebarLinksPrivate));
  91 }
  92
  93 static void
  94 selection_changed_cb (GtkTreeSelection   *selection,
  95                       EvSidebarLinks     *ev_sidebar_links)
  96 {
  97         EvDocument *document;
  98         GtkTreeModel *model;
  99         GtkTreeIter iter;
 100
 101         g_return_if_fail (EV_IS_SIDEBAR_LINKS (ev_sidebar_links));
 102
 103         document = EV_DOCUMENT (ev_sidebar_links->priv->current_document);
 104         g_return_if_fail (ev_sidebar_links->priv->current_document != NULL);
 105
 106         if (gtk_tree_selection_get_selected (selection, &model, &iter)) {
 107                 EvLink *link;
 108                 EvApplication *app;
 109                 GtkWidget *window;
 110                 GValue value = {0, };
 111
 112                 gtk_tree_model_get_value (model, &iter,
 113                                           LINKS_COLUMN_LINK, &value);
 114
 115                 link = EV_LINK (g_value_get_object (&value));
 116                 g_return_if_fail (link != NULL);
 117
 118                 window = gtk_widget_get_ancestor (GTK_WIDGET (ev_sidebar_links),
 119                                                   EV_TYPE_WINDOW);
 120                 if (window) {
 121                         app = ev_application_get_instance ();
 122                         ev_application_open_link (app, EV_WINDOW (window),
 123                                                   link, NULL);
 124                 }
 125         }
 126 }
 127
 128 static void
 129 ev_sidebar_links_construct (EvSidebarLinks *ev_sidebar_links)
 130 {
 131         EvSidebarLinksPrivate *priv;
 132         GtkWidget *swindow;
 133         GtkTreeViewColumn *column;
 134         GtkCellRenderer *renderer;
 135         GtkTreeSelection *selection;
 136
 137         priv = ev_sidebar_links->priv;
 138         priv->model = (GtkTreeModel *) gtk_tree_store_new (LINKS_COLUMN_NUM_COLUMNS,
 139                                                            G_TYPE_STRING,
 140                                                            G_TYPE_INT,
 141                                                            G_TYPE_BOOLEAN,
 142                                                            G_TYPE_OBJECT);
 143
 144         swindow = gtk_scrolled_window_new (NULL, NULL);
 145
 146         gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (swindow),
 147                                         GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
 148         gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (swindow),
 149                                              GTK_SHADOW_IN);
 150
 151         /* Create tree view */
 152         priv->tree_view = gtk_tree_view_new_with_model (priv->model);
 153         g_object_unref (priv->model);
 154         gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (priv->tree_view), FALSE);
 155         gtk_container_add (GTK_CONTAINER (swindow), priv->tree_view);
 156         gtk_tree_view_set_rules_hint (GTK_TREE_VIEW (priv->tree_view), TRUE);
 157
 158         gtk_box_pack_start (GTK_BOX (ev_sidebar_links), swindow, TRUE, TRUE, 0);
 159         gtk_widget_show_all (GTK_WIDGET (ev_sidebar_links));
 160
 161         column = gtk_tree_view_column_new ();
 162         gtk_tree_view_column_set_expand (GTK_TREE_VIEW_COLUMN (column), TRUE);
 163         gtk_tree_view_append_column (GTK_TREE_VIEW (priv->tree_view), column);
 164
 165         renderer = (GtkCellRenderer*)
 166                 g_object_new (GTK_TYPE_CELL_RENDERER_TEXT,
 167                               "ellipsize", PANGO_ELLIPSIZE_END,
 168                               NULL);
 169         gtk_tree_view_column_pack_start (GTK_TREE_VIEW_COLUMN (column), renderer, TRUE);
 170         gtk_tree_view_column_set_attributes (GTK_TREE_VIEW_COLUMN (column), renderer,
 171                                              "markup", LINKS_COLUMN_MARKUP,
 172                                              NULL);
 173
 174         renderer = gtk_cell_renderer_text_new ();
 175         gtk_tree_view_column_pack_end (GTK_TREE_VIEW_COLUMN (column), renderer, FALSE);
 176         gtk_tree_view_column_set_cell_data_func (GTK_TREE_VIEW_COLUMN (column), renderer,
 177                                                  (GtkTreeCellDataFunc) links_page_num_func,
 178                                                  NULL, NULL);
 179
 180
 181         selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (priv->tree_view));
 182         g_signal_connect (selection, "changed",
 183                           G_CALLBACK (selection_changed_cb),
 184                           ev_sidebar_links);
 185 }
 186
 187 static void
 188 ev_sidebar_links_init (EvSidebarLinks *ev_sidebar_links)
 189 {
 190         ev_sidebar_links->priv = EV_SIDEBAR_LINKS_GET_PRIVATE (ev_sidebar_links);
 191
 192         ev_sidebar_links_construct (ev_sidebar_links);
 193 }
 194
 195 static void
 196 links_page_num_func (GtkTreeViewColumn *tree_column,
 197                      GtkCellRenderer   *cell,
 198                      GtkTreeModel      *tree_model,
 199                      GtkTreeIter       *iter,
 200                      gpointer           data)
 201 {
 202         int page_num;
 203         gboolean page_valid;
 204
 205         gtk_tree_model_get (tree_model, iter,
 206                             LINKS_COLUMN_PAGE_NUM, &page_num,
 207                             LINKS_COLUMN_PAGE_VALID, &page_valid,
 208                             -1);
 209
 210         if (page_valid) {
 211                 gchar *markup = g_strdup_printf ("<i>%d</i>", page_num);
 212                 g_object_set (cell,
 213                               "markup", markup,
 214                               "visible", TRUE,
 215                               NULL);
 216                 g_free (markup);
 217         } else {
 218                 g_object_set (cell,
 219                               "visible", FALSE,
 220                               NULL);
 221         }
 222 }
 223
 224 /* Public Functions */
 225
 226 GtkWidget *
 227 ev_sidebar_links_new (void)
 228 {
 229         GtkWidget *ev_sidebar_links;
 230
 231         ev_sidebar_links = g_object_new (EV_TYPE_SIDEBAR_LINKS, NULL);
 232
 233         return ev_sidebar_links;
 234 }
 235
 236 static void
 237 stack_data_free (IdleStackData       *stack_data,
 238                  EvDocumentLinks     *document_links)
 239 {
 240         g_assert (stack_data);
 241
 242         if (stack_data->tree_iter)
 243                 gtk_tree_iter_free (stack_data->tree_iter);
 244         if (stack_data->links_iter)
 245                 ev_document_links_free_iter (document_links, stack_data->links_iter);
 246         g_free (stack_data);
 247 }
 248
 249 static gboolean
 250 do_one_iteration (EvSidebarLinks *ev_sidebar_links)
 251 {
 252         EvSidebarLinksPrivate *priv = ev_sidebar_links->priv;
 253         EvLink *link;
 254         IdleStackData *stack_data;
 255         GtkTreeIter tree_iter;
 256         EvDocumentLinksIter *child_iter;
 257         gint page;
 258
 259         g_assert (priv->idle_stack);
 260
 261         stack_data = (IdleStackData *) priv->idle_stack->data;
 262
 263         link = ev_document_links_get_link
 264                 (EV_DOCUMENT_LINKS (priv->current_document),
 265                  stack_data->links_iter);
 266         if (link == NULL) {
 267                 g_warning ("mismatch in model.  No values available at current level.\n");
 268                 return FALSE;
 269         }
 270
 271         page = ev_link_get_page (link);
 272         gtk_tree_store_append (GTK_TREE_STORE (priv->model), &tree_iter, stack_data->tree_iter);
 273         gtk_tree_store_set (GTK_TREE_STORE (priv->model), &tree_iter,
 274                             LINKS_COLUMN_MARKUP, ev_link_get_title (link),
 275                             LINKS_COLUMN_PAGE_NUM, page,
 276                             /* FIXME: Handle links for real. */
 277                             LINKS_COLUMN_PAGE_VALID, (page >= 0),
 278                             LINKS_COLUMN_LINK, link,
 279                             -1);
 280         g_object_unref (link);
 281
 282         child_iter = ev_document_links_get_child (EV_DOCUMENT_LINKS (priv->current_document),
 283                                                       stack_data->links_iter);
 284         if (child_iter) {
 285                 IdleStackData *child_stack_data;
 286
 287                 child_stack_data = g_new0 (IdleStackData, 1);
 288                 child_stack_data->tree_iter = gtk_tree_iter_copy (&tree_iter);
 289                 child_stack_data->links_iter = child_iter;
 290                 priv->idle_stack = g_list_prepend (priv->idle_stack, child_stack_data);
 291
 292                 return TRUE;
 293         }
 294
 295         /* We don't have children, so we need to walk to the next node */
 296         while (TRUE) {
 297                 if (ev_document_links_next (EV_DOCUMENT_LINKS (priv->current_document),
 298                                                 stack_data->links_iter))
 299                         return TRUE;
 300
 301                 /* We're done with this level.  Pop it off the idle stack and go
 302                  * to the next level */
 303                 stack_data_free (stack_data, EV_DOCUMENT_LINKS (priv->current_document));
 304                 priv->idle_stack = g_list_delete_link (priv->idle_stack, priv->idle_stack);
 305                 if (priv->idle_stack == NULL)
 306                         return FALSE;
 307                 stack_data = priv->idle_stack->data;
 308         }
 309 }
 310
 311 static gboolean
 312 populate_links_idle (gpointer data)
 313 {
 314         GTimer *timer;
 315         gint i;
 316         gulong microseconds = 0;
 317
 318         EvSidebarLinks *ev_sidebar_links = (EvSidebarLinks *)data;
 319         EvSidebarLinksPrivate *priv = ev_sidebar_links->priv;
 320
 321         if (priv->idle_stack == NULL) {
 322                 priv->idle_id = 0;
 323                 return FALSE;
 324         }
 325
 326         /* The amount of time that reading the next bookmark takes is wildly
 327          * inconsistent, so we constrain it to IDLE_WORK_LENGTH microseconds per
 328          * idle iteration. */
 329         timer = g_timer_new ();
 330         i = 0;
 331         g_timer_start (timer);
 332         while (do_one_iteration (ev_sidebar_links)) {
 333                 i++;
 334                 g_timer_elapsed (timer, &microseconds);
 335                 if (microseconds > IDLE_WORK_LENGTH)
 336                         break;
 337         }
 338         g_timer_destroy (timer);
 339 #if 0
 340         g_print ("%d rows done this idle in %d\n", i, (int)microseconds);
 341 #endif
 342         return TRUE;
 343 }
 344
 345 void
 346 ev_sidebar_links_clear_document (EvSidebarLinks *sidebar_links)
 347 {
 348         EvSidebarLinksPrivate *priv;
 349
 350         g_return_if_fail (EV_IS_SIDEBAR_LINKS (sidebar_links));
 351
 352         priv = sidebar_links->priv;
 353         if (priv->current_document) {
 354                 g_object_unref (priv->current_document);
 355                 priv->current_document = NULL;
 356         }
 357         gtk_tree_store_clear (GTK_TREE_STORE (priv->model));
 358
 359         /* Clear the idle */
 360         if (priv->idle_id != 0) {
 361                 g_source_remove (priv->idle_id);
 362                 priv->idle_id = 0;
 363         }
 364         g_list_foreach (priv->idle_stack, (GFunc) stack_data_free, priv->current_document);
 365         g_list_free (priv->idle_stack);
 366         priv->idle_stack = NULL;
 367
 368 }
 369
 370 void
 371 ev_sidebar_links_set_document (EvSidebarLinks *sidebar_links,
 372                                EvDocument     *document)
 373 {
 374         EvSidebarLinksPrivate *priv;
 375         EvDocumentLinksIter *links_iter;
 376
 377         g_return_if_fail (EV_IS_SIDEBAR_LINKS (sidebar_links));
 378         g_return_if_fail (EV_IS_DOCUMENT (document));
 379
 380         priv = sidebar_links->priv;
 381
 382         g_object_ref (document);
 383         ev_sidebar_links_clear_document (sidebar_links);
 384
 385         priv->current_document = document;
 386         links_iter = ev_document_links_begin_read (EV_DOCUMENT_LINKS (document));
 387         if (links_iter) {
 388                 IdleStackData *stack_data;
 389
 390                 stack_data = g_new0 (IdleStackData, 1);
 391                 stack_data->links_iter = links_iter;
 392                 stack_data->tree_iter = NULL;
 393
 394                 priv->idle_stack = g_list_prepend (priv->idle_stack, stack_data);
 395                 priv->idle_id = g_idle_add (populate_links_idle, sidebar_links);
 396         }
 397 }
 398