git.maemo.org Git - hildon/blob - src/hildon-bread-crumb-trail.c

   1 /*
   2  * This file is a part of hildon
   3  *
   4  * Copyright (C) 2007 Nokia Corporation, all rights reserved.
   5  *
   6  * Contact: Michael Dominic Kostrzewa <michael.kostrzewa@nokia.com>
   7  * Author: Xan Lopez <xan.lopez@nokia.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public License
  11  * as published by the Free Software Foundation; version 2.1 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  *
  24  */
  25
  26
  27 /**
  28  * SECTION:hildon-bread-crumb-trail
  29  * @short_description: Widget used to represent a specific path in a hierarchical tree.
  30  * Stability: Unstable
  31  *
  32  * HildonBreadCrumbTrail is a GTK widget used to represent the currently active path in
  33  * some kind of hierarchical structure (file system, media library, structured document, etc).
  34  *
  35  * It has built-in support for text and icon bread crumbs, but the trail only requires a very
  36  * simple interface to be implemented for its children and thus new types of items can be
  37  * implemented if needed. See #HildonBreadCrumb for more details.
  38  */
  39
  40 #include <gdk/gdkkeysyms.h>
  41 #include "hildon-marshalers.h"
  42 #include "hildon-bread-crumb-trail.h"
  43 #include "hildon-bread-crumb-widget.h"
  44
  45 #define HILDON_BREAD_CRUMB_TRAIL_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), HILDON_TYPE_BREAD_CRUMB_TRAIL, HildonBreadCrumbTrailPrivate))
  46
  47 struct _HildonBreadCrumbTrailPrivate
  48 {
  49   GtkWidget *back_button;
  50   GList *item_list;
  51   GtkWidget *arrow;
  52 };
  53
  54 /* Signals */
  55
  56 enum {
  57   CRUMB_CLICKED,
  58   MOVE_PARENT,
  59   LAST_SIGNAL
  60 };
  61
  62 /* Properties */
  63
  64 enum {
  65   PROP_0
  66 };
  67
  68 static void hildon_bread_crumb_trail_size_request (GtkWidget *widget,
  69                                                    GtkRequisition *requisition);
  70 static void hildon_bread_crumb_trail_size_allocate (GtkWidget *widget,
  71                                                     GtkAllocation *allocation);
  72 static void hildon_bread_crumb_trail_add (GtkContainer *container,
  73                                           GtkWidget *widget);
  74 static void hildon_bread_crumb_trail_forall (GtkContainer *container,
  75                                              gboolean include_internals,
  76                                              GtkCallback callback,
  77                                              gpointer callback_data);
  78 static void hildon_bread_crumb_trail_remove (GtkContainer *container,
  79                                              GtkWidget *widget);
  80 static void hildon_bread_crumb_trail_finalize (GObject *object);
  81 static void hildon_bread_crumb_trail_scroll_back (GtkWidget *button,
  82                                                   HildonBreadCrumbTrail *bct);
  83 static void hildon_bread_crumb_trail_update_back_button_sensitivity (HildonBreadCrumbTrail *bct);
  84 static void hildon_bread_crumb_trail_move_parent (HildonBreadCrumbTrail *bct);
  85
  86 static gpointer get_bread_crumb_id (HildonBreadCrumb *item);
  87
  88 static guint bread_crumb_trail_signals[LAST_SIGNAL] = { 0 };
  89
  90 /* GType methods */
  91
  92 G_DEFINE_TYPE (HildonBreadCrumbTrail, hildon_bread_crumb_trail, GTK_TYPE_CONTAINER)
  93
  94 static void
  95 hildon_bread_crumb_trail_class_init (HildonBreadCrumbTrailClass *klass)
  96 {
  97   GObjectClass *gobject_class = (GObjectClass*)klass;
  98   GtkObjectClass *object_class = (GtkObjectClass*)klass;
  99   GtkWidgetClass *widget_class = (GtkWidgetClass*)klass;
 100   GtkContainerClass *container_class = (GtkContainerClass*)klass;
 101   GtkBindingSet *binding_set;
 102
 103   /* GObject signals */
 104   gobject_class->finalize = hildon_bread_crumb_trail_finalize;
 105
 106   /* GtkWidget signals */
 107   widget_class->size_request = hildon_bread_crumb_trail_size_request;
 108   widget_class->size_allocate = hildon_bread_crumb_trail_size_allocate;
 109
 110   /* GtkContainer signals */
 111   container_class->add = hildon_bread_crumb_trail_add;
 112   container_class->forall = hildon_bread_crumb_trail_forall;
 113   container_class->remove = hildon_bread_crumb_trail_remove;
 114
 115   /* HildonBreadCrumbTrail signals */
 116   klass->move_parent = hildon_bread_crumb_trail_move_parent;
 117
 118   /* Style properties */
 119
 120 #define _BREAD_CRUMB_TRAIL_MINIMUM_WIDTH 10
 121
 122   /* FIXME: is this the best way to do it? */
 123   gtk_widget_class_install_style_property (widget_class,
 124                                            g_param_spec_int ("minimum-width",
 125                                                              "Minimum width",
 126                                                              "The minimum width in characters the children widgets will request",
 127                                                              0,
 128                                                              G_MAXINT,
 129                                                              _BREAD_CRUMB_TRAIL_MINIMUM_WIDTH,
 130                                                              G_PARAM_READABLE));
 131
 132 #define _BREAD_CRUMB_TRAIL_ARROW_SIZE 34
 133
 134   gtk_widget_class_install_style_property (widget_class,
 135                                            g_param_spec_int ("arrow-size",
 136                                                              "Arrow size",
 137                                                              "Size of the back button arrow",
 138                                                              0,
 139                                                              G_MAXINT,
 140                                                              _BREAD_CRUMB_TRAIL_ARROW_SIZE,
 141                                                              G_PARAM_READABLE));
 142   /* Signals */
 143   bread_crumb_trail_signals[CRUMB_CLICKED] =
 144     g_signal_new ("crumb-clicked",
 145                   G_OBJECT_CLASS_TYPE (object_class),
 146                   G_SIGNAL_RUN_LAST,
 147                   G_STRUCT_OFFSET (HildonBreadCrumbTrailClass, crumb_clicked),
 148                   g_signal_accumulator_true_handled, NULL,
 149                   _hildon_marshal_BOOLEAN__POINTER,
 150                   G_TYPE_BOOLEAN, 1,
 151                   G_TYPE_POINTER);
 152
 153   bread_crumb_trail_signals[MOVE_PARENT] =
 154     g_signal_new ("move-parent",
 155                   G_OBJECT_CLASS_TYPE (object_class),
 156                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 157                   G_STRUCT_OFFSET (HildonBreadCrumbTrailClass, move_parent),
 158                   NULL, NULL,
 159                   g_cclosure_marshal_VOID__VOID,
 160                   G_TYPE_NONE,
 161                   0);
 162
 163
 164   /* Binding set */
 165   binding_set = gtk_binding_set_by_class (widget_class);
 166
 167   gtk_binding_entry_add_signal (binding_set, GDK_Escape, 0,
 168                                 "move-parent", 0);
 169   gtk_binding_entry_add_signal (binding_set, GDK_BackSpace, 0,
 170                                 "move-parent", 0);
 171
 172   /* Private data */
 173   g_type_class_add_private (gobject_class, sizeof (HildonBreadCrumbTrailPrivate));
 174 }
 175
 176 static void
 177 hildon_bread_crumb_trail_finalize (GObject *object)
 178 {
 179   HildonBreadCrumbTrailPrivate *priv = HILDON_BREAD_CRUMB_TRAIL (object)->priv;
 180
 181   g_list_free (priv->item_list);
 182
 183   G_OBJECT_CLASS (hildon_bread_crumb_trail_parent_class)->finalize (object);
 184 }
 185
 186 static void
 187 hildon_bread_crumb_trail_move_parent (HildonBreadCrumbTrail *bct)
 188 {
 189   if (g_list_length (bct->priv->item_list) > 1)
 190     {
 191       g_signal_emit_by_name (HILDON_BREAD_CRUMB (bct->priv->item_list->next->data),
 192                              "crumb-activated");
 193     }
 194 }
 195
 196 static void
 197 hildon_bread_crumb_trail_size_request (GtkWidget *widget,
 198                                        GtkRequisition *requisition)
 199 {
 200   GList *p;
 201   GtkRequisition child_requisition;
 202   HildonBreadCrumbTrail *bct;
 203   HildonBreadCrumbTrailPrivate *priv;
 204   gint minimum_width, width = 0;
 205   PangoLayout *layout;
 206   gchar *tmp = NULL;
 207
 208   bct= HILDON_BREAD_CRUMB_TRAIL (widget);
 209   priv = bct->priv;
 210
 211   requisition->height = 0;
 212   requisition->width = 0;
 213
 214   gtk_widget_size_request (priv->back_button, &child_requisition);
 215   requisition->width = child_requisition.width;
 216   requisition->height = child_requisition.height;
 217
 218   if (priv->item_list)
 219     {
 220       /* Add minimum width for one item */
 221       /* TODO: this can be probably cached */
 222       gtk_widget_style_get (widget,
 223                             "minimum-width", &minimum_width,
 224                             NULL);
 225
 226       tmp = g_strnfill ((gsize)minimum_width, 'm');
 227       layout = gtk_widget_create_pango_layout (widget, tmp);
 228       g_free (tmp);
 229       pango_layout_get_size (layout, &width, NULL);
 230       requisition->width += PANGO_PIXELS (width);
 231       g_object_unref (layout);
 232     }
 233
 234   /* Button requisitions */
 235   for (p = priv->item_list; p; p = p->next)
 236     {
 237       GtkWidget *child = GTK_WIDGET (p->data);
 238
 239       if (GTK_WIDGET_VISIBLE (child))
 240         gtk_widget_size_request (child, &child_requisition);
 241     }
 242
 243   /* Border width */
 244   requisition->width += GTK_CONTAINER (widget)->border_width * 2;
 245   requisition->height += GTK_CONTAINER (widget)->border_width * 2;
 246
 247   widget->requisition = *requisition;
 248 }
 249
 250 /* Document me please */
 251
 252 static void
 253 hildon_bread_crumb_trail_size_allocate (GtkWidget *widget,
 254                                         GtkAllocation *allocation)
 255 {
 256   GtkRequisition req;
 257   gint natural_width, natural_height;
 258   HildonBreadCrumb *item;
 259   GtkAllocation child_allocation;
 260   GtkRequisition child_requisition;
 261   GtkWidget *child;
 262   gint allocation_width;
 263   gint border_width, width;
 264   gint extra_space;
 265   GList *p, *first_show, *first_hide;
 266   gint back_button_size;
 267   HildonBreadCrumbTrailPrivate *priv = HILDON_BREAD_CRUMB_TRAIL (widget)->priv;
 268
 269   widget->allocation = *allocation;
 270
 271   border_width = (gint) GTK_CONTAINER (widget)->border_width;
 272   allocation_width = allocation->width - 2 * border_width;
 273
 274   /* Allocate the back button */
 275   child_allocation.x = allocation->x + border_width;
 276   child_allocation.y = allocation->y + border_width;
 277   gtk_widget_get_child_requisition (priv->back_button, &child_requisition);
 278   /* We want the back button to be a square */
 279   back_button_size = MAX (child_requisition.width, child_requisition.height);
 280   child_allocation.width = child_allocation.height = back_button_size;
 281   gtk_widget_size_allocate (priv->back_button, &child_allocation);
 282   child_allocation.x += back_button_size;
 283
 284   /* If there are no buttons there's nothing else to do */
 285   if (priv->item_list == NULL)
 286     return;
 287
 288   /* We find out how many buttons can we show, starting from the
 289      the last one in the logical path (the first item in the list) */
 290
 291   width = back_button_size;
 292   p = priv->item_list;
 293   first_show = NULL;
 294   first_hide = NULL;
 295   extra_space = 0;
 296
 297   for (p = priv->item_list; p; p = p->next)
 298     {
 299       item = HILDON_BREAD_CRUMB (p->data);
 300       child = GTK_WIDGET (item);
 301
 302       /* Does the widget fit with its natural size? */
 303       hildon_bread_crumb_get_natural_size (item,
 304                                            &natural_width,
 305                                            &natural_height);
 306
 307       if (width + natural_width <= allocation_width)
 308         {
 309           /* Yes, it does */
 310           first_show = p;
 311           first_hide = p->next;
 312           width += natural_width;
 313         }
 314       else
 315         {
 316           /* No, it doesn't. Allocate as much as possible
 317              and stop */
 318           child_allocation.width = allocation_width - width;
 319
 320           gtk_widget_size_request (child, &req);
 321
 322           if (child_allocation.width > req.width)
 323             {
 324               first_hide = p->next;
 325               gtk_widget_set_child_visible (child, TRUE);
 326               gtk_widget_size_allocate (child, &child_allocation);
 327               child_allocation.x += child_allocation.width;
 328             }
 329           else
 330             {
 331               extra_space = child_allocation.width;
 332             }
 333
 334           break;
 335         }
 336     }
 337
 338   /* Not enough items to fill the breadcrumb? */
 339   if (p == NULL && width < allocation_width)
 340     {
 341       extra_space = allocation_width - width;
 342     }
 343
 344   /* Allocate the other buttons */
 345   for (p = first_show; p; p = p->prev)
 346     {
 347       item = HILDON_BREAD_CRUMB (p->data);
 348       child = GTK_WIDGET (item);
 349
 350       /* Does the widget fit with its natural size? */
 351       hildon_bread_crumb_get_natural_size (item,
 352                                            &natural_width,
 353                                            &natural_height);
 354
 355       /* If I'm the last and there's extra space, use it */
 356       if (p->prev == NULL && extra_space != 0)
 357         {
 358           natural_width += extra_space;
 359         }
 360
 361       child_allocation.width = natural_width;
 362       gtk_widget_set_child_visible (child, TRUE);
 363       gtk_widget_size_allocate (child, &child_allocation);
 364       child_allocation.x += child_allocation.width;
 365     }
 366
 367   for (p = first_hide; p; p = p->next)
 368     {
 369       item = HILDON_BREAD_CRUMB (p->data);
 370       child = GTK_WIDGET (item);
 371
 372       gtk_widget_set_child_visible (GTK_WIDGET (item), FALSE);
 373     }
 374 }
 375
 376 static gpointer
 377 get_bread_crumb_id (HildonBreadCrumb *item)
 378 {
 379   return g_object_get_data (G_OBJECT (item), "bread-crumb-id");
 380 }
 381
 382 static void
 383 crumb_activated_cb (GtkWidget *button,
 384                     HildonBreadCrumbTrail *bct)
 385 {
 386   gboolean signal_handled = FALSE;
 387
 388   g_signal_emit (bct, bread_crumb_trail_signals[CRUMB_CLICKED], 0,
 389                  get_bread_crumb_id (HILDON_BREAD_CRUMB (button)),
 390                  &signal_handled);
 391
 392   if (signal_handled == FALSE)
 393     {
 394       GtkWidget *child;
 395       gboolean focus_last_item = FALSE;
 396       HildonBreadCrumbTrailPrivate *priv;
 397
 398       priv = bct->priv;
 399
 400       child = GTK_WIDGET (priv->item_list->data);
 401
 402       /* We remove the tip of the list until we hit the clicked button */
 403       while (child && child != button)
 404         {
 405           if (GTK_WIDGET_HAS_FOCUS (child))
 406             focus_last_item = TRUE;
 407
 408           gtk_container_remove (GTK_CONTAINER (bct), child);
 409
 410           if (priv->item_list == NULL)
 411               return;
 412
 413           child = GTK_WIDGET (priv->item_list->data);
 414         }
 415
 416       if (focus_last_item)
 417         gtk_widget_grab_focus (GTK_WIDGET (bct->priv->item_list->data));
 418     }
 419 }
 420
 421 static void
 422 hildon_bread_crumb_trail_add (GtkContainer *container,
 423                               GtkWidget *widget)
 424 {
 425   gtk_widget_set_parent (widget, GTK_WIDGET (container));
 426
 427   if (HILDON_IS_BREAD_CRUMB (widget))
 428     {
 429       HildonBreadCrumbTrail *bct = HILDON_BREAD_CRUMB_TRAIL (container);
 430
 431       g_signal_connect (G_OBJECT (widget), "crumb-activated",
 432                         G_CALLBACK (crumb_activated_cb), container);
 433
 434       bct->priv->item_list = g_list_prepend (bct->priv->item_list, widget);
 435
 436       hildon_bread_crumb_trail_update_back_button_sensitivity (bct);
 437     }
 438 }
 439
 440 static void
 441 hildon_bread_crumb_trail_forall (GtkContainer *container,
 442                                  gboolean include_internals,
 443                                  GtkCallback callback,
 444                                  gpointer callback_data)
 445 {
 446   g_return_if_fail (callback != NULL);
 447   g_return_if_fail (HILDON_IS_BREAD_CRUMB_TRAIL (container));
 448
 449   GList *children;
 450   HildonBreadCrumbTrailPrivate *priv = HILDON_BREAD_CRUMB_TRAIL (container)->priv;
 451
 452   children = priv->item_list;
 453
 454   while (children)
 455     {
 456       GtkWidget *child;
 457       child = GTK_WIDGET (children->data);
 458       children = children->next;
 459
 460       (*callback) (child, callback_data);
 461     }
 462
 463   if (include_internals && priv->back_button)
 464     {
 465       (*callback) (priv->back_button, callback_data);
 466     }
 467 }
 468
 469 static void
 470 hildon_bread_crumb_trail_remove (GtkContainer *container,
 471                                  GtkWidget *widget)
 472 {
 473   GList *p, *next;
 474   HildonBreadCrumbTrailPrivate *priv;
 475   gboolean was_visible = GTK_WIDGET_VISIBLE (widget);
 476
 477   priv = HILDON_BREAD_CRUMB_TRAIL (container)->priv;
 478
 479   p = priv->item_list;
 480
 481   while (p)
 482     {
 483       next = p->next;
 484
 485       if (widget == GTK_WIDGET (p->data))
 486         {
 487           g_signal_handlers_disconnect_by_func (widget, G_CALLBACK (crumb_activated_cb),
 488                                                 HILDON_BREAD_CRUMB_TRAIL (container));
 489           gtk_widget_unparent (widget);
 490
 491           priv->item_list = g_list_delete_link (priv->item_list, p);
 492
 493           hildon_bread_crumb_trail_update_back_button_sensitivity (HILDON_BREAD_CRUMB_TRAIL (container));
 494
 495           if (was_visible)
 496             {
 497               gtk_widget_queue_resize (GTK_WIDGET (container));
 498             }
 499         }
 500
 501       p = next;
 502     }
 503 }
 504
 505 static void
 506 hildon_bread_crumb_trail_update_back_button_sensitivity (HildonBreadCrumbTrail *bct)
 507 {
 508   guint list_length;
 509   HildonBreadCrumbTrailPrivate *priv = bct->priv;
 510
 511   list_length = g_list_length (priv->item_list);
 512
 513   if (list_length <= 1)
 514     {
 515       gtk_widget_set_sensitive (priv->back_button, FALSE);
 516     }
 517   else
 518     {
 519       gtk_widget_set_sensitive (priv->back_button, TRUE);
 520     }
 521 }
 522
 523 static GtkWidget*
 524 create_back_button (HildonBreadCrumbTrail *bct)
 525 {
 526   GtkWidget *button;
 527   GtkWidget *arrow;
 528   gint arrow_size;
 529
 530   gtk_widget_push_composite_child ();
 531
 532   button = gtk_button_new ();
 533   gtk_widget_set_name (button, "hildon-bread-crumb-back-button");
 534   gtk_widget_set_sensitive (button, FALSE);
 535
 536   arrow = gtk_arrow_new (GTK_ARROW_LEFT, GTK_SHADOW_NONE);
 537   bct->priv->arrow = arrow;
 538   gtk_widget_style_get (GTK_WIDGET (bct),
 539                         "arrow-size", &arrow_size,
 540                         NULL);
 541   gtk_widget_set_size_request (arrow, arrow_size, arrow_size);
 542
 543   gtk_container_add (GTK_CONTAINER (button), arrow);
 544   gtk_container_add (GTK_CONTAINER (bct), button);
 545   gtk_widget_show_all (button);
 546
 547   gtk_widget_pop_composite_child ();
 548
 549   return button;
 550 }
 551
 552 static void
 553 hildon_bread_crumb_trail_init (HildonBreadCrumbTrail *bct)
 554 {
 555   HildonBreadCrumbTrailPrivate *priv = HILDON_BREAD_CRUMB_TRAIL_GET_PRIVATE (bct);
 556
 557   GTK_WIDGET_SET_FLAGS (bct, GTK_NO_WINDOW);
 558   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (bct), FALSE);
 559
 560   bct->priv = priv;
 561   priv->item_list = NULL;
 562
 563   priv->back_button = create_back_button (bct);
 564   g_signal_connect (priv->back_button, "clicked",
 565                     G_CALLBACK (hildon_bread_crumb_trail_scroll_back),
 566                     bct);
 567 }
 568
 569 static void
 570 hildon_bread_crumb_trail_scroll_back (GtkWidget *button,
 571                                       HildonBreadCrumbTrail *bct)
 572 {
 573   hildon_bread_crumb_trail_move_parent (bct);
 574 }
 575
 576 static void
 577 attach_bread_crumb (HildonBreadCrumbTrail *bct,
 578                     GtkWidget *bread_crumb,
 579                     gpointer id,
 580                     GDestroyNotify destroy)
 581 {
 582   g_object_set_data_full (G_OBJECT (bread_crumb), "bread-crumb-id", id, destroy);
 583
 584   gtk_container_add (GTK_CONTAINER (bct), bread_crumb);
 585
 586   gtk_widget_show (bread_crumb);
 587 }
 588
 589 /* PUBLIC API */
 590
 591 /**
 592  * hildon_bread_crumb_trail_new:
 593  *
 594  * Creates a new #HildonBreadCrumbTrail widget.
 595  *
 596  * Returns: a #GtkWidget pointer of newly created bread crumb trail
 597  * widget
 598  *
 599  * Stability: Unstable
 600  */
 601
 602 GtkWidget*
 603 hildon_bread_crumb_trail_new (void)
 604 {
 605   return GTK_WIDGET (g_object_new (HILDON_TYPE_BREAD_CRUMB_TRAIL, NULL));
 606 }
 607
 608 /**
 609  * hildon_bread_crumb_trail_push:
 610  * @bct: pointer to #HildonBreadCrumbTrail
 611  * @item: the #HildonBreadCrumb to be added to the trail
 612  * @id: optional id for the bread crumb
 613  * @destroy: GDestroyNotify callback to be called when the bread crumb is destroyed
 614  *
 615  * Adds a new bread crumb to the end of the trail.
 616  *
 617  * Stability: Unstable
 618  */
 619
 620 void
 621 hildon_bread_crumb_trail_push (HildonBreadCrumbTrail *bct,
 622                                HildonBreadCrumb *item,
 623                                gpointer id,
 624                                GDestroyNotify destroy)
 625 {
 626   GtkWidget *widget;
 627
 628   g_return_if_fail (HILDON_IS_BREAD_CRUMB_TRAIL (bct));
 629   g_return_if_fail (HILDON_IS_BREAD_CRUMB (item));
 630
 631   widget = GTK_WIDGET (item);
 632
 633   attach_bread_crumb (bct, widget, id, destroy);
 634 }
 635
 636 /**
 637  * hildon_bread_crumb_trail_push_text:
 638  * @bct: pointer to #HildonBreadCrumbTrail
 639  * @text: content of the new bread crumb
 640  * @id: optional id for the bread crumb
 641  * @destroy: GDestroyNotify callback to be called when the bread crumb is destroyed
 642  *
 643  * Adds a new bread crumb to the end of the trail containing the specified text.
 644  *
 645  * Stability: Unstable
 646  */
 647
 648 void
 649 hildon_bread_crumb_trail_push_text (HildonBreadCrumbTrail *bct,
 650                                     const gchar *text,
 651                                     gpointer id,
 652                                     GDestroyNotify destroy)
 653 {
 654   GtkWidget *widget;
 655
 656   g_return_if_fail (HILDON_IS_BREAD_CRUMB_TRAIL (bct));
 657   g_return_if_fail (text != NULL);
 658
 659   widget = _hildon_bread_crumb_widget_new_with_text (text);
 660   if (bct->priv->item_list == NULL)
 661     {
 662       g_object_set (G_OBJECT (widget), "show-separator", FALSE, NULL);
 663     }
 664   attach_bread_crumb (bct, widget, id, destroy);
 665 }
 666
 667 /**
 668  * hildon_bread_crumb_trail_push_icon:
 669  * @bct: pointer to #HildonBreadCrumbTrail
 670  * @text: content of the new bread crumb
 671  * @icon: a widget to set as the icon in the bread crumb
 672  * @id: optional id for the bread crumb
 673  * @destroy: GDestroyNotify callback to be called when the bread crumb is destroyed
 674  *
 675  * Adds a new bread crumb to the end of the trail containing the specified text and
 676  * icon.
 677  *
 678  * Stability: Unstable
 679  */
 680
 681 void
 682 hildon_bread_crumb_trail_push_icon (HildonBreadCrumbTrail *bct,
 683                                     const gchar *text,
 684                                     GtkWidget *icon,
 685                                     gpointer id,
 686                                     GDestroyNotify destroy)
 687 {
 688   GtkWidget *widget;
 689
 690   g_return_if_fail (HILDON_IS_BREAD_CRUMB_TRAIL (bct));
 691   g_return_if_fail (text != NULL);
 692   g_return_if_fail (GTK_IS_WIDGET (icon));
 693
 694   widget = _hildon_bread_crumb_widget_new_with_icon (icon, text);
 695   if (bct->priv->item_list == NULL)
 696     {
 697       g_object_set (G_OBJECT (widget), "show-separator", FALSE, NULL);
 698     }
 699   attach_bread_crumb (bct, widget, id, destroy);
 700 }
 701
 702 /**
 703  * hildon_bread_crumb_trail_pop:
 704  * @bct: pointer to #HildonBreadCrumbTrail
 705  *
 706  * Removes the last bread crumb from the trail.
 707  *
 708  * Stability: Unstable
 709  */
 710
 711 void
 712 hildon_bread_crumb_trail_pop (HildonBreadCrumbTrail *bct)
 713 {
 714   GtkWidget *child;
 715   HildonBreadCrumbTrailPrivate *priv;
 716
 717   g_return_if_fail (HILDON_IS_BREAD_CRUMB_TRAIL (bct));
 718
 719   priv = bct->priv;
 720
 721   if (priv->item_list == NULL)
 722     return;
 723
 724   if (priv->item_list)
 725     {
 726       child = GTK_WIDGET (priv->item_list->data);
 727       gtk_container_remove (GTK_CONTAINER (bct), child);
 728     }
 729
 730   hildon_bread_crumb_trail_update_back_button_sensitivity (bct);
 731 }
 732
 733 /**
 734  * hildon_bread_crumb_trail_clear:
 735  * @bct: pointer to #HildonBreadCrumbTrail
 736  *
 737  * Removes all the bread crumbs from the bread crumb trail.
 738  *
 739  * Stability: Unstable
 740  */
 741
 742 void
 743 hildon_bread_crumb_trail_clear (HildonBreadCrumbTrail *bct)
 744 {
 745   HildonBreadCrumbTrailPrivate *priv;
 746
 747   g_return_if_fail (HILDON_IS_BREAD_CRUMB_TRAIL (bct));
 748
 749   priv = bct->priv;
 750
 751   while (priv->item_list)
 752     {
 753       hildon_bread_crumb_trail_pop (bct);
 754     }
 755
 756   /*
 757     Sensitivity hack from hell. We need to do this while
 758      http://bugzilla.gnome.org/show_bug.cgi?id=56070 is not
 759      fixed to allow repeated clicking on the back button if
 760      someone clears and rebuilds the trail when it's clicked
 761   */
 762   gtk_widget_hide (priv->back_button);
 763   gtk_widget_show (priv->back_button);
 764 }