Pileus Git - ~andy/gtk/blob - gtk/gtkpathbar.c

   1 /* gtkpathbar.h
   2  * Copyright (C) 2004  Red Hat, Inc.,  Jonathan Blandford <jrb@gnome.org>
   3  *
   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.
   8  *
   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.
  13  *
  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.
  18  */
  19
  20 #include <config.h>
  21 #include <string.h>
  22 #include "gtkpathbar.h"
  23 #include "gtktogglebutton.h"
  24 #include "gtkarrow.h"
  25 #include "gtkimage.h"
  26 #include "gtkintl.h"
  27 #include "gtkicontheme.h"
  28 #include "gtkiconfactory.h"
  29 #include "gtklabel.h"
  30 #include "gtkhbox.h"
  31 #include "gtkmain.h"
  32 #include "gtkmarshalers.h"
  33
  34 enum {
  35   PATH_CLICKED,
  36   LAST_SIGNAL
  37 };
  38
  39 typedef enum {
  40   NORMAL_BUTTON,
  41   ROOT_BUTTON,
  42   HOME_BUTTON,
  43   DESKTOP_BUTTON
  44 } ButtonType;
  45
  46 #define BUTTON_DATA(x) ((ButtonData *)(x))
  47
  48 static guint path_bar_signals [LAST_SIGNAL] = { 0 };
  49
  50 /* Icon size for if we can't get it from the theme */
  51 #define FALLBACK_ICON_SIZE 20
  52
  53 typedef struct _ButtonData ButtonData;
  54
  55 struct _ButtonData
  56 {
  57   GtkWidget *button;
  58   ButtonType type;
  59   char *dir_name;
  60   GtkFilePath *path;
  61   GtkWidget *image;
  62   GtkWidget *label;
  63   gboolean ignore_changes;
  64 };
  65
  66 G_DEFINE_TYPE (GtkPathBar,
  67                gtk_path_bar,
  68                GTK_TYPE_CONTAINER);
  69
  70 static void gtk_path_bar_finalize                 (GObject          *object);
  71 static void gtk_path_bar_dispose                  (GObject          *object);
  72 static void gtk_path_bar_size_request             (GtkWidget        *widget,
  73                                                    GtkRequisition   *requisition);
  74 static void gtk_path_bar_size_allocate            (GtkWidget        *widget,
  75                                                    GtkAllocation    *allocation);
  76 static void gtk_path_bar_direction_changed        (GtkWidget        *widget,
  77                                                    GtkTextDirection  direction);
  78 static void gtk_path_bar_add                      (GtkContainer     *container,
  79                                                    GtkWidget        *widget);
  80 static void gtk_path_bar_remove                   (GtkContainer     *container,
  81                                                    GtkWidget        *widget);
  82 static void gtk_path_bar_forall                   (GtkContainer     *container,
  83                                                    gboolean          include_internals,
  84                                                    GtkCallback       callback,
  85                                                    gpointer          callback_data);
  86 static void gtk_path_bar_scroll_up                (GtkWidget        *button,
  87                                                    GtkPathBar       *path_bar);
  88 static void gtk_path_bar_scroll_down              (GtkWidget        *button,
  89                                                    GtkPathBar       *path_bar);
  90 static void gtk_path_bar_style_set                (GtkWidget        *widget,
  91                                                    GtkStyle         *previous_style);
  92 static void gtk_path_bar_screen_changed           (GtkWidget        *widget,
  93                                                    GdkScreen        *previous_screen);
  94 static void gtk_path_bar_check_icon_theme         (GtkPathBar       *path_bar);
  95 static void gtk_path_bar_update_button_appearance (GtkPathBar       *path_bar,
  96                                                    ButtonData       *button_data,
  97                                                    gboolean          current_dir);
  98
  99 static GtkWidget *
 100 get_slider_button (GtkPathBar *path_bar)
 101 {
 102   GtkWidget *button;
 103
 104   gtk_widget_push_composite_child ();
 105
 106   button = gtk_button_new ();
 107   gtk_container_add (GTK_CONTAINER (button), gtk_arrow_new (GTK_ARROW_RIGHT, GTK_SHADOW_OUT));
 108   gtk_container_add (GTK_CONTAINER (path_bar), button);
 109   gtk_widget_show_all (button);
 110
 111   gtk_widget_pop_composite_child ();
 112
 113   return button;
 114 }
 115
 116 static void
 117 gtk_path_bar_init (GtkPathBar *path_bar)
 118 {
 119   GTK_WIDGET_SET_FLAGS (path_bar, GTK_NO_WINDOW);
 120   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (path_bar), FALSE);
 121
 122   path_bar->spacing = 3;
 123   path_bar->up_slider_button = get_slider_button (path_bar);
 124   path_bar->down_slider_button = get_slider_button (path_bar);
 125   path_bar->icon_size = FALLBACK_ICON_SIZE;
 126
 127   g_signal_connect (path_bar->up_slider_button, "clicked", G_CALLBACK (gtk_path_bar_scroll_up), path_bar);
 128   g_signal_connect (path_bar->down_slider_button, "clicked", G_CALLBACK (gtk_path_bar_scroll_down), path_bar);
 129 }
 130
 131 static void
 132 gtk_path_bar_class_init (GtkPathBarClass *path_bar_class)
 133 {
 134   GObjectClass *gobject_class;
 135   GtkObjectClass *object_class;
 136   GtkWidgetClass *widget_class;
 137   GtkContainerClass *container_class;
 138
 139   gobject_class = (GObjectClass *) path_bar_class;
 140   object_class = (GtkObjectClass *) path_bar_class;
 141   widget_class = (GtkWidgetClass *) path_bar_class;
 142   container_class = (GtkContainerClass *) path_bar_class;
 143
 144   gobject_class->finalize = gtk_path_bar_finalize;
 145   gobject_class->dispose = gtk_path_bar_dispose;
 146
 147   widget_class->size_request = gtk_path_bar_size_request;
 148   widget_class->size_allocate = gtk_path_bar_size_allocate;
 149   widget_class->direction_changed = gtk_path_bar_direction_changed;
 150   widget_class->style_set = gtk_path_bar_style_set;
 151   widget_class->screen_changed = gtk_path_bar_screen_changed;
 152
 153   container_class->add = gtk_path_bar_add;
 154   container_class->forall = gtk_path_bar_forall;
 155   container_class->remove = gtk_path_bar_remove;
 156   /* FIXME: */
 157   /*  container_class->child_type = gtk_path_bar_child_type;*/
 158
 159   path_bar_signals [PATH_CLICKED] =
 160     g_signal_new ("path_clicked",
 161                   G_OBJECT_CLASS_TYPE (object_class),
 162                   G_SIGNAL_RUN_FIRST,
 163                   G_STRUCT_OFFSET (GtkPathBarClass, path_clicked),
 164                   NULL, NULL,
 165                   _gtk_marshal_VOID__POINTER,
 166                   G_TYPE_NONE, 1,
 167                   G_TYPE_POINTER);
 168 }
 169
 170
 171 static void
 172 gtk_path_bar_finalize (GObject *object)
 173 {
 174   GtkPathBar *path_bar;
 175
 176   path_bar = GTK_PATH_BAR (object);
 177   g_list_free (path_bar->button_list);
 178   if (path_bar->root_path)
 179     gtk_file_path_free (path_bar->root_path);
 180   if (path_bar->home_path)
 181     gtk_file_path_free (path_bar->home_path);
 182   if (path_bar->desktop_path)
 183     gtk_file_path_free (path_bar->desktop_path);
 184
 185   if (path_bar->root_icon)
 186     g_object_unref (path_bar->root_icon);
 187   if (path_bar->home_icon)
 188     g_object_unref (path_bar->home_icon);
 189   if (path_bar->desktop_icon)
 190     g_object_unref (path_bar->desktop_icon);
 191
 192   if (path_bar->file_system)
 193     g_object_unref (path_bar->file_system);
 194
 195   G_OBJECT_CLASS (gtk_path_bar_parent_class)->finalize (object);
 196 }
 197
 198 /* Removes the settings signal handler.  It's safe to call multiple times */
 199 static void
 200 remove_settings_signal (GtkPathBar *path_bar,
 201                         GdkScreen  *screen)
 202 {
 203   if (path_bar->settings_signal_id)
 204     {
 205       GtkSettings *settings;
 206
 207       settings = gtk_settings_get_for_screen (screen);
 208       g_signal_handler_disconnect (settings,
 209                                    path_bar->settings_signal_id);
 210       path_bar->settings_signal_id = 0;
 211     }
 212 }
 213
 214 static void
 215 gtk_path_bar_dispose (GObject *object)
 216 {
 217   remove_settings_signal (GTK_PATH_BAR (object),
 218                           gtk_widget_get_screen (GTK_WIDGET (object)));
 219
 220   G_OBJECT_CLASS (gtk_path_bar_parent_class)->dispose (object);
 221 }
 222
 223 /* Size requisition:
 224  *
 225  * Ideally, our size is determined by another widget, and we are just filling
 226  * available space.
 227  */
 228 static void
 229 gtk_path_bar_size_request (GtkWidget      *widget,
 230                            GtkRequisition *requisition)
 231 {
 232   ButtonData *button_data;
 233   GtkPathBar *path_bar;
 234   GtkRequisition child_requisition;
 235   GList *list;
 236
 237   path_bar = GTK_PATH_BAR (widget);
 238
 239   requisition->width = 0;
 240   requisition->height = 0;
 241
 242   for (list = path_bar->button_list; list; list = list->next)
 243     {
 244       button_data = BUTTON_DATA (list->data);
 245       gtk_widget_size_request (button_data->button, &child_requisition);
 246       requisition->width = MAX (child_requisition.width, requisition->width);
 247       requisition->height = MAX (child_requisition.height, requisition->height);
 248     }
 249
 250   /* Add space for slider, if we have more than one path */
 251   /* Theoretically, the slider could be bigger than the other button.  But we're
 252    * not going to worry about that now.
 253    */
 254   path_bar->slider_width = requisition->height / 2 + 5;
 255   if (path_bar->button_list && path_bar->button_list->next != NULL)
 256     requisition->width += (path_bar->spacing + path_bar->slider_width) * 2;
 257
 258   gtk_widget_size_request (path_bar->up_slider_button, &child_requisition);
 259   gtk_widget_size_request (path_bar->down_slider_button, &child_requisition);
 260
 261   requisition->width += GTK_CONTAINER (widget)->border_width * 2;
 262   requisition->height += GTK_CONTAINER (widget)->border_width * 2;
 263
 264   widget->requisition = *requisition;
 265 }
 266
 267 static void
 268 gtk_path_bar_update_slider_buttons (GtkPathBar *path_bar)
 269 {
 270   GtkTextDirection direction;
 271
 272   direction = gtk_widget_get_direction (GTK_WIDGET (path_bar));
 273   if (direction == GTK_TEXT_DIR_RTL)
 274     {
 275       GtkWidget *arrow;
 276
 277       arrow = gtk_bin_get_child (GTK_BIN (path_bar->up_slider_button));
 278       g_object_set (arrow, "arrow_type", GTK_ARROW_RIGHT, NULL);
 279
 280       arrow = gtk_bin_get_child (GTK_BIN (path_bar->down_slider_button));
 281       g_object_set (arrow, "arrow_type", GTK_ARROW_LEFT, NULL);
 282     }
 283   else
 284     {
 285       GtkWidget *arrow;
 286
 287       arrow = gtk_bin_get_child (GTK_BIN (path_bar->up_slider_button));
 288       g_object_set (arrow, "arrow_type", GTK_ARROW_LEFT, NULL);
 289
 290       arrow = gtk_bin_get_child (GTK_BIN (path_bar->down_slider_button));
 291       g_object_set (arrow, "arrow_type", GTK_ARROW_RIGHT, NULL);
 292     }
 293
 294   if (path_bar->button_list)
 295     {
 296       GtkWidget *button;
 297
 298       button = BUTTON_DATA (path_bar->button_list->data)->button;
 299       if (gtk_widget_get_child_visible (button))
 300         gtk_widget_set_sensitive (path_bar->down_slider_button, FALSE);
 301       else
 302         gtk_widget_set_sensitive (path_bar->down_slider_button, TRUE);
 303
 304       button = BUTTON_DATA (g_list_last (path_bar->button_list)->data)->button;
 305       if (gtk_widget_get_child_visible (button))
 306         gtk_widget_set_sensitive (path_bar->up_slider_button, FALSE);
 307       else
 308         gtk_widget_set_sensitive (path_bar->up_slider_button, TRUE);
 309     }
 310 }
 311
 312 /* This is a tad complicated
 313  */
 314 static void
 315 gtk_path_bar_size_allocate (GtkWidget     *widget,
 316                             GtkAllocation *allocation)
 317 {
 318   GtkWidget *child;
 319   GtkPathBar *path_bar = GTK_PATH_BAR (widget);
 320   GtkTextDirection direction;
 321   GtkAllocation child_allocation;
 322   GList *list, *first_button;
 323   gint width;
 324   gint allocation_width;
 325   gint border_width;
 326   gboolean need_sliders = FALSE;
 327   gint up_slider_offset = 0;
 328   gint down_slider_offset = 0;
 329
 330   widget->allocation = *allocation;
 331
 332   /* No path is set; we don't have to allocate anything. */
 333   if (path_bar->button_list == NULL)
 334     return;
 335
 336   direction = gtk_widget_get_direction (widget);
 337   border_width = (gint) GTK_CONTAINER (path_bar)->border_width;
 338   allocation_width = allocation->width - 2 * border_width;
 339
 340   /* First, we check to see if we need the scrollbars. */
 341   width = BUTTON_DATA (path_bar->button_list->data)->button->requisition.width;
 342   for (list = path_bar->button_list->next; list; list = list->next)
 343     {
 344       child = BUTTON_DATA (list->data)->button;
 345
 346       width += child->requisition.width + path_bar->spacing;
 347     }
 348
 349   if (width <= allocation_width)
 350     {
 351       first_button = g_list_last (path_bar->button_list);
 352     }
 353   else
 354     {
 355       gboolean reached_end = FALSE;
 356       gint slider_space = 2 * (path_bar->spacing + path_bar->slider_width);
 357
 358       if (path_bar->first_scrolled_button)
 359         first_button = path_bar->first_scrolled_button;
 360       else
 361         first_button = path_bar->button_list;
 362       need_sliders = TRUE;
 363
 364       /* To see how much space we have, and how many buttons we can display.
 365        * We start at the first button, count forward until hit the new
 366        * button, then count backwards.
 367        */
 368       /* Count down the path chain towards the end. */
 369       width = BUTTON_DATA (first_button->data)->button->requisition.width;
 370       list = first_button->prev;
 371       while (list && !reached_end)
 372         {
 373           child = BUTTON_DATA (list->data)->button;
 374
 375           if (width + child->requisition.width +
 376               path_bar->spacing + slider_space > allocation_width)
 377             reached_end = TRUE;
 378           else
 379             width += child->requisition.width + path_bar->spacing;
 380
 381           list = list->prev;
 382         }
 383
 384       /* Finally, we walk up, seeing how many of the previous buttons we can
 385        * add */
 386       while (first_button->next && ! reached_end)
 387         {
 388           child = BUTTON_DATA (first_button->next->data)->button;
 389
 390           if (width + child->requisition.width + path_bar->spacing + slider_space > allocation_width)
 391             {
 392               reached_end = TRUE;
 393             }
 394           else
 395             {
 396               width += child->requisition.width + path_bar->spacing;
 397               first_button = first_button->next;
 398             }
 399         }
 400     }
 401
 402   /* Now, we allocate space to the buttons */
 403   child_allocation.y = allocation->y + border_width;
 404   child_allocation.height = MAX (1, (gint) allocation->height - border_width * 2);
 405
 406   if (direction == GTK_TEXT_DIR_RTL)
 407     {
 408       child_allocation.x = allocation->x + allocation->width - border_width;
 409       if (need_sliders)
 410         {
 411           child_allocation.x -= (path_bar->spacing + path_bar->slider_width);
 412           up_slider_offset = allocation->width - border_width - path_bar->slider_width;
 413         }
 414     }
 415   else
 416     {
 417       child_allocation.x = allocation->x + border_width;
 418       if (need_sliders)
 419         {
 420           up_slider_offset = border_width;
 421           child_allocation.x += (path_bar->spacing + path_bar->slider_width);
 422         }
 423     }
 424
 425   for (list = first_button; list; list = list->prev)
 426     {
 427       child = BUTTON_DATA (list->data)->button;
 428
 429       child_allocation.width = child->requisition.width;
 430       if (direction == GTK_TEXT_DIR_RTL)
 431         child_allocation.x -= child_allocation.width;
 432
 433       /* Check to see if we've don't have any more space to allocate buttons */
 434       if (need_sliders && direction == GTK_TEXT_DIR_RTL)
 435         {
 436           if (child_allocation.x - path_bar->spacing - path_bar->slider_width < widget->allocation.x + border_width)
 437             break;
 438         }
 439       else if (need_sliders && direction == GTK_TEXT_DIR_LTR)
 440         {
 441           if (child_allocation.x + child_allocation.width + path_bar->spacing + path_bar->slider_width >
 442               widget->allocation.x + border_width + allocation_width)
 443             break;
 444         }
 445
 446       gtk_widget_set_child_visible (BUTTON_DATA (list->data)->button, TRUE);
 447       gtk_widget_size_allocate (child, &child_allocation);
 448
 449       if (direction == GTK_TEXT_DIR_RTL)
 450         {
 451           child_allocation.x -= path_bar->spacing;
 452           down_slider_offset = child_allocation.x - widget->allocation.x - path_bar->slider_width;
 453         }
 454       else
 455         {
 456           child_allocation.x += child_allocation.width + path_bar->spacing;
 457           down_slider_offset = child_allocation.x - widget->allocation.x;
 458         }
 459     }
 460   /* Now we go hide all the widgets that don't fit */
 461   while (list)
 462     {
 463       gtk_widget_set_child_visible (BUTTON_DATA (list->data)->button, FALSE);
 464       list = list->prev;
 465     }
 466   for (list = first_button->next; list; list = list->next)
 467     {
 468       gtk_widget_set_child_visible (BUTTON_DATA (list->data)->button, FALSE);
 469     }
 470
 471   if (need_sliders)
 472     {
 473       child_allocation.width = path_bar->slider_width;
 474
 475       child_allocation.x = up_slider_offset + allocation->x;
 476       gtk_widget_size_allocate (path_bar->up_slider_button, &child_allocation);
 477
 478       child_allocation.x = down_slider_offset + allocation->x;
 479       gtk_widget_size_allocate (path_bar->down_slider_button, &child_allocation);
 480
 481       gtk_widget_set_child_visible (path_bar->up_slider_button, TRUE);
 482       gtk_widget_set_child_visible (path_bar->down_slider_button, TRUE);
 483       gtk_widget_show_all (path_bar->up_slider_button);
 484       gtk_widget_show_all (path_bar->down_slider_button);
 485       gtk_path_bar_update_slider_buttons (path_bar);
 486     }
 487   else
 488     {
 489       gtk_widget_set_child_visible (path_bar->up_slider_button, FALSE);
 490       gtk_widget_set_child_visible (path_bar->down_slider_button, FALSE);
 491     }
 492 }
 493
 494 static void
 495  gtk_path_bar_direction_changed (GtkWidget *widget,
 496                                  GtkTextDirection direction)
 497 {
 498   gtk_path_bar_update_slider_buttons (GTK_PATH_BAR (widget));
 499
 500   (* GTK_WIDGET_CLASS (gtk_path_bar_parent_class)->direction_changed) (widget, direction);
 501 }
 502
 503 static void
 504 gtk_path_bar_style_set (GtkWidget *widget,
 505                         GtkStyle  *previous_style)
 506 {
 507   if (GTK_WIDGET_CLASS (gtk_path_bar_parent_class)->style_set)
 508     GTK_WIDGET_CLASS (gtk_path_bar_parent_class)->style_set (widget, previous_style);
 509
 510   gtk_path_bar_check_icon_theme (GTK_PATH_BAR (widget));
 511 }
 512
 513 static void
 514 gtk_path_bar_screen_changed (GtkWidget *widget,
 515                              GdkScreen *previous_screen)
 516 {
 517   if (GTK_WIDGET_CLASS (gtk_path_bar_parent_class)->screen_changed)
 518     GTK_WIDGET_CLASS (gtk_path_bar_parent_class)->screen_changed (widget, previous_screen);
 519
 520   /* We might nave a new settings, so we remove the old one */
 521   if (previous_screen)
 522     remove_settings_signal (GTK_PATH_BAR (widget), previous_screen);
 523
 524   gtk_path_bar_check_icon_theme (GTK_PATH_BAR (widget));
 525 }
 526
 527 static void
 528 gtk_path_bar_add (GtkContainer *container,
 529                   GtkWidget    *widget)
 530 {
 531   gtk_widget_set_parent (widget, GTK_WIDGET (container));
 532 }
 533
 534 static void
 535 gtk_path_bar_remove (GtkContainer *container,
 536                      GtkWidget    *widget)
 537 {
 538   GtkPathBar *path_bar;
 539   GList *children;
 540
 541   path_bar = GTK_PATH_BAR (container);
 542
 543   children = path_bar->button_list;
 544
 545   while (children)
 546     {
 547       if (widget == BUTTON_DATA (children->data)->button)
 548         {
 549           gboolean was_visible;
 550
 551           was_visible = GTK_WIDGET_VISIBLE (widget);
 552           gtk_widget_unparent (widget);
 553
 554           path_bar->button_list = g_list_remove_link (path_bar->button_list, children);
 555           g_list_free (children);
 556
 557           if (was_visible)
 558             gtk_widget_queue_resize (GTK_WIDGET (container));
 559           break;
 560         }
 561
 562       children = children->next;
 563     }
 564 }
 565
 566 static void
 567 gtk_path_bar_forall (GtkContainer *container,
 568                      gboolean      include_internals,
 569                      GtkCallback   callback,
 570                      gpointer      callback_data)
 571 {
 572   GtkPathBar *path_bar;
 573   GList *children;
 574
 575   g_return_if_fail (callback != NULL);
 576   path_bar = GTK_PATH_BAR (container);
 577
 578   children = path_bar->button_list;
 579   while (children)
 580     {
 581       GtkWidget *child;
 582       child = BUTTON_DATA (children->data)->button;
 583       children = children->next;
 584
 585       (* callback) (child, callback_data);
 586     }
 587
 588   (* callback) (path_bar->up_slider_button, callback_data);
 589   (* callback) (path_bar->down_slider_button, callback_data);
 590 }
 591
 592 static void
 593 gtk_path_bar_scroll_down (GtkWidget *button, GtkPathBar *path_bar)
 594 {
 595   GList *list;
 596   GList *down_button = NULL;
 597   GList *up_button = NULL;
 598   gint space_available;
 599   gint space_needed;
 600   gint border_width;
 601   GtkTextDirection direction;
 602
 603   border_width = GTK_CONTAINER (path_bar)->border_width;
 604   direction = gtk_widget_get_direction (GTK_WIDGET (path_bar));
 605
 606   /* We find the button at the 'down' end that we have to make
 607    * visible */
 608   for (list = path_bar->button_list; list; list = list->next)
 609     {
 610       if (list->next && gtk_widget_get_child_visible (BUTTON_DATA (list->next->data)->button))
 611         {
 612           down_button = list;
 613           break;
 614         }
 615     }
 616
 617   /* Find the last visible button on the 'up' end
 618    */
 619   for (list = g_list_last (path_bar->button_list); list; list = list->prev)
 620     {
 621       if (gtk_widget_get_child_visible (BUTTON_DATA (list->data)->button))
 622         {
 623           up_button = list;
 624           break;
 625         }
 626     }
 627
 628   space_needed = BUTTON_DATA (down_button->data)->button->allocation.width + path_bar->spacing;
 629   if (direction == GTK_TEXT_DIR_RTL)
 630     space_available = GTK_WIDGET (path_bar)->allocation.x + GTK_WIDGET (path_bar)->allocation.width;
 631   else
 632     space_available = (GTK_WIDGET (path_bar)->allocation.x + GTK_WIDGET (path_bar)->allocation.width - border_width) -
 633       (path_bar->down_slider_button->allocation.x + path_bar->down_slider_button->allocation.width);
 634
 635   /* We have space_available extra space that's not being used.  We
 636    * need space_needed space to make the button fit.  So we walk down
 637    * from the end, removing buttons until we get all the space we
 638    * need. */
 639   while (space_available < space_needed)
 640     {
 641       space_available += BUTTON_DATA (up_button->data)->button->allocation.width + path_bar->spacing;
 642       up_button = up_button->prev;
 643       path_bar->first_scrolled_button = up_button;
 644     }
 645 }
 646
 647 static void
 648 gtk_path_bar_scroll_up (GtkWidget *button, GtkPathBar *path_bar)
 649 {
 650   GList *list;
 651
 652   for (list = g_list_last (path_bar->button_list); list; list = list->prev)
 653     {
 654       if (list->prev && gtk_widget_get_child_visible (BUTTON_DATA (list->prev->data)->button))
 655         {
 656           path_bar->first_scrolled_button = list;
 657           return;
 658         }
 659     }
 660 }
 661
 662 /* Changes the icons wherever it is needed */
 663 static void
 664 reload_icons (GtkPathBar *path_bar)
 665 {
 666   GList *list;
 667
 668   if (path_bar->root_icon)
 669     {
 670       g_object_unref (path_bar->root_icon);
 671       path_bar->root_icon = NULL;
 672     }
 673   if (path_bar->home_icon)
 674     {
 675       g_object_unref (path_bar->home_icon);
 676       path_bar->home_icon = NULL;
 677     }
 678   if (path_bar->desktop_icon)
 679     {
 680       g_object_unref (path_bar->desktop_icon);
 681       path_bar->desktop_icon = NULL;
 682     }
 683
 684   for (list = path_bar->button_list; list; list = list->next)
 685     {
 686       ButtonData *button_data;
 687       gboolean current_dir;
 688
 689       button_data = BUTTON_DATA (list->data);
 690       if (button_data->type != NORMAL_BUTTON)
 691         {
 692           current_dir = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (button_data->button));
 693           gtk_path_bar_update_button_appearance (path_bar, button_data, current_dir);
 694         }
 695     }
 696
 697 }
 698
 699 static void
 700 change_icon_theme (GtkPathBar *path_bar)
 701 {
 702   GtkSettings *settings;
 703   gint width, height;
 704
 705   settings = gtk_settings_get_for_screen (gtk_widget_get_screen (GTK_WIDGET (path_bar)));
 706
 707   if (gtk_icon_size_lookup_for_settings (settings, GTK_ICON_SIZE_BUTTON, &width, &height))
 708     path_bar->icon_size = MAX (width, height);
 709   else
 710     path_bar->icon_size = FALLBACK_ICON_SIZE;
 711
 712   reload_icons (path_bar);
 713 }
 714 /* Callback used when a GtkSettings value changes */
 715 static void
 716 settings_notify_cb (GObject    *object,
 717                     GParamSpec *pspec,
 718                     GtkPathBar *path_bar)
 719 {
 720   const char *name;
 721
 722   name = g_param_spec_get_name (pspec);
 723
 724   if (! strcmp (name, "gtk-icon-theme-name") ||
 725       ! strcmp (name, "gtk-icon-sizes"))
 726     change_icon_theme (path_bar);
 727 }
 728
 729 static void
 730 gtk_path_bar_check_icon_theme (GtkPathBar *path_bar)
 731 {
 732   GtkSettings *settings;
 733
 734   if (path_bar->settings_signal_id)
 735     return;
 736
 737   settings = gtk_settings_get_for_screen (gtk_widget_get_screen (GTK_WIDGET (path_bar)));
 738   path_bar->settings_signal_id = g_signal_connect (settings, "notify", G_CALLBACK (settings_notify_cb), path_bar);
 739
 740   change_icon_theme (path_bar);
 741 }
 742
 743 /* Public functions and their helpers */
 744 static void
 745 gtk_path_bar_clear_buttons (GtkPathBar *path_bar)
 746 {
 747   while (path_bar->button_list != NULL)
 748     {
 749       gtk_container_remove (GTK_CONTAINER (path_bar), BUTTON_DATA (path_bar->button_list->data)->button);
 750     }
 751   path_bar->first_scrolled_button = NULL;
 752 }
 753
 754 static void
 755 button_clicked_cb (GtkWidget *button,
 756                    gpointer   data)
 757 {
 758   ButtonData *button_data;
 759   GtkWidget *path_bar;
 760
 761   button_data = BUTTON_DATA (data);
 762   if (button_data->ignore_changes)
 763     return;
 764
 765   path_bar = button->parent;
 766   g_assert (GTK_IS_PATH_BAR (path_bar));
 767   gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), TRUE);
 768
 769   g_signal_emit (path_bar, path_bar_signals [PATH_CLICKED], 0, button_data->path);
 770 }
 771
 772 static GdkPixbuf *
 773 get_button_image (GtkPathBar *path_bar,
 774                   ButtonType  button_type)
 775 {
 776   GtkFileSystemVolume *volume;
 777
 778   switch (button_type)
 779     {
 780     case ROOT_BUTTON:
 781
 782       if (path_bar->root_icon != NULL)
 783         return path_bar->root_icon;
 784
 785       volume = gtk_file_system_get_volume_for_path (path_bar->file_system, path_bar->root_path);
 786       if (volume == NULL)
 787         return NULL;
 788
 789       path_bar->root_icon = gtk_file_system_volume_render_icon (path_bar->file_system,
 790                                                                 volume,
 791                                                                 GTK_WIDGET (path_bar),
 792                                                                 path_bar->icon_size,
 793                                                                 NULL);
 794       gtk_file_system_volume_free (path_bar->file_system, volume);
 795
 796       return path_bar->root_icon;
 797     case HOME_BUTTON:
 798       if (path_bar->home_icon != NULL)
 799         return path_bar->home_icon;
 800
 801       path_bar->home_icon = gtk_file_system_render_icon (path_bar->file_system,
 802                                                          path_bar->home_path,
 803                                                          GTK_WIDGET (path_bar),
 804                                                          path_bar->icon_size,
 805                                                          NULL);
 806       return path_bar->home_icon;
 807     case DESKTOP_BUTTON:
 808       if (path_bar->desktop_icon != NULL)
 809         return path_bar->desktop_icon;
 810
 811       path_bar->desktop_icon = gtk_file_system_render_icon (path_bar->file_system,
 812                                                             path_bar->desktop_path,
 813                                                             GTK_WIDGET (path_bar),
 814                                                             path_bar->icon_size,
 815                                                             NULL);
 816       return path_bar->desktop_icon;
 817     default:
 818       return NULL;
 819     }
 820
 821   return NULL;
 822 }
 823
 824 static void
 825 button_data_free (ButtonData *button_data)
 826 {
 827   gtk_file_path_free (button_data->path);
 828   g_free (button_data->dir_name);
 829   g_free (button_data);
 830 }
 831
 832 static void
 833 gtk_path_bar_update_button_appearance (GtkPathBar *path_bar,
 834                                        ButtonData *button_data,
 835                                        gboolean    current_dir)
 836 {
 837   const gchar *dir_name;
 838
 839   if (button_data->type == HOME_BUTTON)
 840     dir_name = _("Home");
 841   else if (button_data->type == DESKTOP_BUTTON)
 842     dir_name = _("Desktop");
 843   else
 844     dir_name = button_data->dir_name;
 845
 846   if (button_data->label != NULL)
 847     {
 848       if (current_dir)
 849         {
 850           char *markup;
 851
 852           markup = g_markup_printf_escaped ("<b>%s</b>", dir_name);
 853           gtk_label_set_markup (GTK_LABEL (button_data->label), markup);
 854           g_free (markup);
 855         }
 856       else
 857         {
 858           gtk_label_set_text (GTK_LABEL (button_data->label), dir_name);
 859         }
 860     }
 861
 862   if (button_data->image != NULL)
 863     {
 864       GdkPixbuf *pixbuf;
 865       pixbuf = get_button_image (path_bar, button_data->type);
 866       gtk_image_set_from_pixbuf (GTK_IMAGE (button_data->image), pixbuf);
 867     }
 868
 869   if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (button_data->button)) != current_dir)
 870     {
 871       button_data->ignore_changes = TRUE;
 872       gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button_data->button), current_dir);
 873       button_data->ignore_changes = FALSE;
 874     }
 875 }
 876
 877 static ButtonType
 878 find_button_type (GtkPathBar  *path_bar,
 879                   GtkFilePath *path)
 880 {
 881   if (! gtk_file_path_compare (path, path_bar->root_path))
 882     return ROOT_BUTTON;
 883   if (! gtk_file_path_compare (path, path_bar->home_path))
 884     return HOME_BUTTON;
 885   if (! gtk_file_path_compare (path, path_bar->desktop_path))
 886     return DESKTOP_BUTTON;
 887
 888  return NORMAL_BUTTON;
 889 }
 890
 891 static ButtonData *
 892 make_directory_button (GtkPathBar  *path_bar,
 893                        const char  *dir_name,
 894                        GtkFilePath *path,
 895                        gboolean     current_dir)
 896 {
 897   GtkWidget *child = NULL;
 898   ButtonData *button_data;
 899
 900   /* Is it a special button? */
 901   button_data = g_new0 (ButtonData, 1);
 902
 903   button_data->type = find_button_type (path_bar, path);
 904   button_data->button = gtk_toggle_button_new ();
 905
 906   switch (button_data->type)
 907     {
 908     case ROOT_BUTTON:
 909       button_data->image = gtk_image_new ();
 910       child = button_data->image;
 911       button_data->label = NULL;
 912       break;
 913     case HOME_BUTTON:
 914     case DESKTOP_BUTTON:
 915       button_data->image = gtk_image_new ();
 916       button_data->label = gtk_label_new (NULL);
 917       child = gtk_hbox_new (FALSE, 2);
 918       gtk_box_pack_start (GTK_BOX (child), button_data->image, FALSE, FALSE, 0);
 919       gtk_box_pack_start (GTK_BOX (child), button_data->label, FALSE, FALSE, 0);
 920       break;
 921     case NORMAL_BUTTON:
 922     default:
 923       button_data->label = gtk_label_new (NULL);
 924       child = button_data->label;
 925       button_data->image = NULL;
 926     }
 927
 928   button_data->dir_name = g_strdup (dir_name);
 929   button_data->path = gtk_file_path_new_dup (gtk_file_path_get_string (path));
 930
 931   gtk_container_add (GTK_CONTAINER (button_data->button), child);
 932   gtk_widget_show_all (button_data->button);
 933
 934   gtk_path_bar_update_button_appearance (path_bar, button_data, current_dir);
 935
 936   g_signal_connect (button_data->button, "clicked",
 937                     G_CALLBACK (button_clicked_cb),
 938                     button_data);
 939   g_object_weak_ref (G_OBJECT (button_data->button),
 940                      (GWeakNotify) button_data_free, button_data);
 941
 942   return button_data;
 943 }
 944
 945 static gboolean
 946 gtk_path_bar_check_parent_path (GtkPathBar         *path_bar,
 947                                 const GtkFilePath  *file_path,
 948                                 GtkFileSystem      *file_system)
 949 {
 950   GList *list;
 951   GList *current_path = NULL;
 952
 953   for (list = path_bar->button_list; list; list = list->next)
 954     {
 955       ButtonData *button_data;
 956
 957       button_data = list->data;
 958       if (! gtk_file_path_compare (file_path, button_data->path))
 959         {
 960           current_path = list;
 961           break;
 962         }
 963     }
 964
 965   if (current_path)
 966     {
 967       for (list = path_bar->button_list; list; list = list->next)
 968         {
 969           gtk_path_bar_update_button_appearance (path_bar,
 970                                                  BUTTON_DATA (list->data),
 971                                                  (list == current_path) ? TRUE : FALSE);
 972         }
 973       return TRUE;
 974     }
 975   return FALSE;
 976 }
 977
 978 gboolean
 979 _gtk_path_bar_set_path (GtkPathBar         *path_bar,
 980                         const GtkFilePath  *file_path,
 981                         GError            **error)
 982 {
 983   GtkFilePath *path;
 984   gboolean first_directory = TRUE;
 985   gboolean result;
 986   GList *new_buttons = NULL;
 987
 988   g_return_val_if_fail (GTK_IS_PATH_BAR (path_bar), FALSE);
 989   g_return_val_if_fail (file_path != NULL, FALSE);
 990
 991   result = TRUE;
 992
 993   /* Check whether the new path is already present in the pathbar as buttons.
 994    * This could be a parent directory or a previous selected subdirectory.
 995    */
 996   if (gtk_path_bar_check_parent_path (path_bar, file_path, path_bar->file_system))
 997     return TRUE;
 998
 999   path = gtk_file_path_copy (file_path);
1000
1001   gtk_widget_push_composite_child ();
1002
1003   while (path != NULL)
1004     {
1005       GtkFilePath *parent_path = NULL;
1006       ButtonData *button_data;
1007       const gchar *display_name;
1008       GtkFileFolder *file_folder;
1009       GtkFileInfo *file_info;
1010       gboolean valid;
1011
1012       valid = gtk_file_system_get_parent (path_bar->file_system,
1013                                           path,
1014                                           &parent_path,
1015                                           error);
1016       if (!valid)
1017         {
1018           result = FALSE;
1019           gtk_file_path_free (path);
1020           break;
1021         }
1022
1023       file_folder = gtk_file_system_get_folder (path_bar->file_system,
1024                                                 parent_path ? parent_path : path,
1025                                                 GTK_FILE_INFO_DISPLAY_NAME,
1026                                                 NULL);
1027       file_info = gtk_file_folder_get_info (file_folder, path, error);
1028       g_object_unref (file_folder);
1029
1030       if (!file_info)
1031         {
1032           result = FALSE;
1033
1034           gtk_file_path_free (parent_path);
1035           gtk_file_path_free (path);
1036           break;
1037         }
1038
1039       display_name = gtk_file_info_get_display_name (file_info);
1040
1041       button_data = make_directory_button (path_bar, display_name, path, first_directory);
1042       gtk_file_info_free (file_info);
1043       gtk_file_path_free (path);
1044
1045       new_buttons = g_list_prepend (new_buttons, button_data);
1046
1047       if (button_data->type != NORMAL_BUTTON)
1048         {
1049           gtk_file_path_free (parent_path);
1050           break;
1051         }
1052
1053       path = parent_path;
1054       first_directory = FALSE;
1055     }
1056
1057   if (result)
1058     {
1059       GList *l;
1060
1061       gtk_path_bar_clear_buttons (path_bar);
1062       path_bar->button_list = g_list_reverse (new_buttons);
1063
1064       for (l = path_bar->button_list; l; l = l->next)
1065         {
1066           GtkWidget *button = BUTTON_DATA (l->data)->button;
1067           gtk_container_add (GTK_CONTAINER (path_bar), button);
1068         }
1069     }
1070   else
1071     {
1072       GList *l;
1073
1074       for (l = new_buttons; l; l = l->next)
1075         {
1076           GtkWidget *button = BUTTON_DATA (l->data)->button;
1077           gtk_widget_destroy (button);
1078           gtk_widget_unref (button);
1079         }
1080
1081       g_list_free (new_buttons);
1082     }
1083
1084   gtk_widget_pop_composite_child ();
1085
1086   return result;
1087 }
1088
1089
1090 /* FIXME: This should be a construct-only property */
1091 void
1092 _gtk_path_bar_set_file_system (GtkPathBar    *path_bar,
1093                                GtkFileSystem *file_system)
1094 {
1095   const char *home;
1096   char *desktop;
1097
1098   g_return_if_fail (GTK_IS_PATH_BAR (path_bar));
1099
1100   g_assert (path_bar->file_system == NULL);
1101
1102   path_bar->file_system = g_object_ref (file_system);
1103
1104   home = g_get_home_dir ();
1105   desktop = g_build_filename (home, "Desktop", NULL);
1106   path_bar->home_path = gtk_file_system_filename_to_path (path_bar->file_system, home);
1107   path_bar->desktop_path = gtk_file_system_filename_to_path (path_bar->file_system, desktop);
1108   path_bar->root_path = gtk_file_system_filename_to_path (path_bar->file_system, "/");
1109 }