git.maemo.org Git - modest/blob - src/widgets/modest-folder-view.c

   1 /* Copyright (c) 2006, Nokia Corporation
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  *   notice, this list of conditions and the following disclaimer.
  10  * * Redistributions in binary form must reproduce the above copyright
  11  *   notice, this list of conditions and the following disclaimer in the
  12  *   documentation and/or other materials provided with the distribution.
  13  * * Neither the name of the Nokia Corporation nor the names of its
  14  *   contributors may be used to endorse or promote products derived from
  15  *   this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  18  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  20  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  21  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  24  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  25  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  26  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <glib/gi18n.h>
  31 #include <string.h>
  32
  33 #include <tny-account-store-view.h>
  34 #include <tny-gtk-account-list-model.h>
  35 #include <tny-gtk-folder-store-tree-model.h>
  36 #include <tny-gtk-header-list-model.h>
  37 #include <tny-folder.h>
  38 #include <tny-folder-monitor.h>
  39 #include <tny-account-store.h>
  40 #include <tny-account.h>
  41 #include <tny-folder.h>
  42 #include <tny-camel-folder.h>
  43 #include <tny-simple-list.h>
  44 #include <modest-tny-folder.h>
  45 #include <modest-marshal.h>
  46 #include <modest-icon-names.h>
  47 #include <modest-tny-account-store.h>
  48 #include <modest-text-utils.h>
  49 #include <modest-runtime.h>
  50 #include "modest-folder-view.h"
  51 #include <modest-dnd.h>
  52
  53 /* 'private'/'protected' functions */
  54 static void modest_folder_view_class_init  (ModestFolderViewClass *klass);
  55 static void modest_folder_view_init        (ModestFolderView *obj);
  56 static void modest_folder_view_finalize    (GObject *obj);
  57
  58 static void         tny_account_store_view_init (gpointer g,
  59                                                  gpointer iface_data);
  60
  61 static void         modest_folder_view_set_account_store (TnyAccountStoreView *self,
  62                                                           TnyAccountStore     *account_store);
  63
  64 static gboolean     update_model           (ModestFolderView *self,
  65                                             ModestTnyAccountStore *account_store);
  66
  67 static gboolean     update_model_empty     (ModestFolderView *self);
  68
  69 static void         on_selection_changed   (GtkTreeSelection *sel, gpointer data);
  70
  71 static void         on_account_update      (TnyAccountStore *account_store,
  72                                             const gchar *account,
  73                                             gpointer user_data);
  74
  75 static void         on_accounts_reloaded   (TnyAccountStore *store,
  76                                             gpointer user_data);
  77
  78 static gint         cmp_rows               (GtkTreeModel *tree_model,
  79                                             GtkTreeIter *iter1,
  80                                             GtkTreeIter *iter2,
  81                                             gpointer user_data);
  82
  83 /* DnD functions */
  84 static void         on_drag_data_get       (GtkWidget *widget,
  85                                             GdkDragContext *context,
  86                                             GtkSelectionData *selection_data,
  87                                             guint info,
  88                                             guint time,
  89                                             gpointer data);
  90
  91 static void         on_drag_data_received  (GtkWidget *widget,
  92                                             GdkDragContext *context,
  93                                             gint x,
  94                                             gint y,
  95                                             GtkSelectionData *selection_data,
  96                                             guint info,
  97                                             guint time,
  98                                             gpointer data);
  99
 100 static gboolean     on_drag_motion         (GtkWidget      *widget,
 101                                             GdkDragContext *context,
 102                                             gint            x,
 103                                             gint            y,
 104                                             guint           time,
 105                                             gpointer        user_data);
 106
 107 static gint         expand_row_timeout     (gpointer data);
 108
 109 static void         setup_drag_and_drop    (GtkTreeView *self);
 110
 111 enum {
 112         FOLDER_SELECTION_CHANGED_SIGNAL,
 113         LAST_SIGNAL
 114 };
 115
 116 typedef struct _ModestFolderViewPrivate ModestFolderViewPrivate;
 117 struct _ModestFolderViewPrivate {
 118         TnyAccountStore     *account_store;
 119         TnyFolder           *cur_folder;
 120         GtkTreeRowReference *cur_row;
 121
 122         gulong               account_update_signal;
 123         gulong               changed_signal;
 124         gulong               accounts_reloaded_signal;
 125         GMutex              *lock;
 126
 127         GtkTreeSelection    *cur_selection;
 128         TnyFolderStoreQuery *query;
 129         guint                timer_expander;
 130
 131         TnyFolderMonitor    *monitor;
 132 };
 133 #define MODEST_FOLDER_VIEW_GET_PRIVATE(o)                       \
 134         (G_TYPE_INSTANCE_GET_PRIVATE((o),                       \
 135                                      MODEST_TYPE_FOLDER_VIEW,   \
 136                                      ModestFolderViewPrivate))
 137 /* globals */
 138 static GObjectClass *parent_class = NULL;
 139
 140 static guint signals[LAST_SIGNAL] = {0};
 141
 142 GType
 143 modest_folder_view_get_type (void)
 144 {
 145         static GType my_type = 0;
 146         if (!my_type) {
 147                 static const GTypeInfo my_info = {
 148                         sizeof(ModestFolderViewClass),
 149                         NULL,           /* base init */
 150                         NULL,           /* base finalize */
 151                         (GClassInitFunc) modest_folder_view_class_init,
 152                         NULL,           /* class finalize */
 153                         NULL,           /* class data */
 154                         sizeof(ModestFolderView),
 155                         1,              /* n_preallocs */
 156                         (GInstanceInitFunc) modest_folder_view_init,
 157                         NULL
 158                 };
 159
 160                 static const GInterfaceInfo tny_account_store_view_info = {
 161                         (GInterfaceInitFunc) tny_account_store_view_init, /* interface_init */
 162                         NULL,         /* interface_finalize */
 163                         NULL          /* interface_data */
 164                 };
 165
 166
 167                 my_type = g_type_register_static (GTK_TYPE_TREE_VIEW,
 168                                                   "ModestFolderView",
 169                                                   &my_info, 0);
 170
 171                 g_type_add_interface_static (my_type,
 172                                              TNY_TYPE_ACCOUNT_STORE_VIEW,
 173                                              &tny_account_store_view_info);
 174         }
 175         return my_type;
 176 }
 177
 178 static void
 179 modest_folder_view_class_init (ModestFolderViewClass *klass)
 180 {
 181         GObjectClass *gobject_class;
 182         gobject_class = (GObjectClass*) klass;
 183
 184         parent_class            = g_type_class_peek_parent (klass);
 185         gobject_class->finalize = modest_folder_view_finalize;
 186
 187         g_type_class_add_private (gobject_class,
 188                                   sizeof(ModestFolderViewPrivate));
 189
 190         signals[FOLDER_SELECTION_CHANGED_SIGNAL] =
 191                 g_signal_new ("folder_selection_changed",
 192                               G_TYPE_FROM_CLASS (gobject_class),
 193                               G_SIGNAL_RUN_FIRST,
 194                               G_STRUCT_OFFSET (ModestFolderViewClass,
 195                                                folder_selection_changed),
 196                               NULL, NULL,
 197                               modest_marshal_VOID__POINTER_BOOLEAN,
 198                               G_TYPE_NONE, 2, G_TYPE_POINTER, G_TYPE_BOOLEAN);
 199 }
 200
 201
 202
 203 static void
 204 text_cell_data  (GtkTreeViewColumn *column,  GtkCellRenderer *renderer,
 205                  GtkTreeModel *tree_model,  GtkTreeIter *iter,  gpointer data)
 206 {
 207         GObject *rendobj;
 208         gchar *fname = NULL;
 209         gint unread;
 210         TnyFolderType type;
 211         TnyFolder *folder = NULL;
 212
 213         g_return_if_fail (column);
 214         g_return_if_fail (tree_model);
 215
 216         gtk_tree_model_get (tree_model, iter,
 217                             TNY_GTK_FOLDER_STORE_TREE_MODEL_NAME_COLUMN, &fname,
 218                             TNY_GTK_FOLDER_STORE_TREE_MODEL_UNREAD_COLUMN, &unread,
 219                             TNY_GTK_FOLDER_STORE_TREE_MODEL_TYPE_COLUMN, &type,
 220                             TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN, &folder,
 221                             -1);
 222         rendobj = G_OBJECT(renderer);
 223
 224         if (!fname)
 225                 return;
 226
 227         if (folder && type != TNY_FOLDER_TYPE_ROOT) { /* FIXME: tnymail bug? crashes with root folders */
 228                 if (modest_tny_folder_is_local_folder (folder)) {
 229                         TnyFolderType type;
 230                         type = modest_tny_folder_get_local_folder_type (folder);
 231                         if (type != TNY_FOLDER_TYPE_UNKNOWN) {
 232                                 g_free (fname);
 233                                 fname = g_strdup(modest_local_folder_info_get_type_display_name (type));
 234                         }
 235                 }
 236         } else if (folder && type == TNY_FOLDER_TYPE_ROOT) {
 237                 if (strcmp (fname, MODEST_LOCAL_FOLDERS_ACCOUNT_NAME) == 0) {/* FIXME: hack */
 238                         g_free (fname);
 239                         fname = g_strdup (MODEST_LOCAL_FOLDERS_DISPLAY_NAME);
 240                 }
 241         }
 242
 243         if (unread > 0) {
 244                 gchar *folder_title = g_strdup_printf ("%s (%d)", fname, unread);
 245                 g_object_set (rendobj,"text", folder_title,  "weight", 800, NULL);
 246                 g_free (folder_title);
 247         } else
 248                 g_object_set (rendobj,"text", fname, "weight", 400, NULL);
 249
 250         g_free (fname);
 251         if (folder) g_object_unref (G_OBJECT (folder));
 252 }
 253
 254
 255 static GdkPixbuf*
 256 get_cached_icon (const gchar *name)
 257 {
 258         GError *err = NULL;
 259         gpointer pixbuf;
 260         gpointer orig_key;
 261         static GHashTable *icon_cache = NULL;
 262
 263         g_return_val_if_fail (name, NULL);
 264
 265         if (G_UNLIKELY(!icon_cache))
 266                 icon_cache = modest_cache_mgr_get_cache (modest_runtime_get_cache_mgr(),
 267                                                          MODEST_CACHE_MGR_CACHE_TYPE_PIXBUF);
 268
 269         if (!icon_cache || !g_hash_table_lookup_extended (icon_cache, name, &orig_key, &pixbuf)) {
 270                 pixbuf = (gpointer)gdk_pixbuf_new_from_file (name, &err);
 271                 if (!pixbuf) {
 272                         g_printerr ("modest: error in icon factory while loading '%s': %s\n",
 273                                     name, err->message);
 274                         g_error_free (err);
 275                 }
 276                 /* if we cannot find it, we still insert (if we have a cache), so we get the error
 277                  * only once */
 278                 if (icon_cache)
 279                         g_hash_table_insert (icon_cache, g_strdup(name),(gpointer)pixbuf);
 280         }
 281         return GDK_PIXBUF(pixbuf);
 282 }
 283
 284
 285 static void
 286 icon_cell_data  (GtkTreeViewColumn *column,  GtkCellRenderer *renderer,
 287                  GtkTreeModel *tree_model,  GtkTreeIter *iter, gpointer data)
 288 {
 289         GObject *rendobj;
 290         GdkPixbuf *pixbuf;
 291         TnyFolderType type;
 292         gchar *fname = NULL;
 293         gint unread;
 294
 295         rendobj = G_OBJECT(renderer);
 296         gtk_tree_model_get (tree_model, iter,
 297                             TNY_GTK_FOLDER_STORE_TREE_MODEL_TYPE_COLUMN, &type,
 298                             TNY_GTK_FOLDER_STORE_TREE_MODEL_NAME_COLUMN, &fname,
 299                             TNY_GTK_FOLDER_STORE_TREE_MODEL_UNREAD_COLUMN, &unread,
 300                             -1);
 301         rendobj = G_OBJECT(renderer);
 302
 303         if (type == TNY_FOLDER_TYPE_NORMAL || type == TNY_FOLDER_TYPE_UNKNOWN) {
 304                 type = modest_tny_folder_guess_folder_type_from_name (fname);
 305         }
 306         g_free (fname);
 307
 308         switch (type) {
 309         case TNY_FOLDER_TYPE_ROOT:
 310                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_ACCOUNT);
 311                 break;
 312         case TNY_FOLDER_TYPE_INBOX:
 313                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_INBOX);
 314                 break;
 315         case TNY_FOLDER_TYPE_OUTBOX:
 316                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_OUTBOX);
 317                 break;
 318         case TNY_FOLDER_TYPE_JUNK:
 319                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_JUNK);
 320                 break;
 321         case TNY_FOLDER_TYPE_SENT:
 322                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_SENT);
 323                 break;
 324         case TNY_FOLDER_TYPE_TRASH:
 325                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_TRASH);
 326                 break;
 327         case TNY_FOLDER_TYPE_DRAFTS:
 328                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_DRAFTS);
 329                 break;
 330         case TNY_FOLDER_TYPE_NOTES:
 331                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_NOTES);
 332                 break;
 333         case TNY_FOLDER_TYPE_CALENDAR:
 334                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_CALENDAR);
 335                 break;
 336         case TNY_FOLDER_TYPE_CONTACTS:
 337                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_CONTACTS);
 338                 break;
 339         case TNY_FOLDER_TYPE_NORMAL:
 340         default:
 341                 pixbuf = get_cached_icon (MODEST_FOLDER_ICON_NORMAL);
 342                 break;
 343         }
 344         g_object_set (rendobj, "pixbuf", pixbuf, NULL);
 345 }
 346
 347 static void
 348 modest_folder_view_init (ModestFolderView *obj)
 349 {
 350         ModestFolderViewPrivate *priv;
 351         GtkTreeViewColumn *column;
 352         GtkCellRenderer *renderer;
 353         GtkTreeSelection *sel;
 354
 355         priv =  MODEST_FOLDER_VIEW_GET_PRIVATE(obj);
 356
 357         priv->timer_expander = 0;
 358         priv->account_store  = NULL;
 359         priv->cur_folder     = NULL;
 360         priv->cur_row        = NULL;
 361         priv->query          = NULL;
 362         priv->monitor        = NULL;
 363
 364         priv->lock           = g_mutex_new ();
 365
 366         column = gtk_tree_view_column_new ();
 367         gtk_tree_view_append_column (GTK_TREE_VIEW(obj),column);
 368
 369         renderer = gtk_cell_renderer_pixbuf_new();
 370         gtk_tree_view_column_pack_start (column, renderer, FALSE);
 371         gtk_tree_view_column_set_cell_data_func(column, renderer,
 372                                                 icon_cell_data, NULL, NULL);
 373
 374         renderer = gtk_cell_renderer_text_new();
 375         gtk_tree_view_column_pack_start (column, renderer, FALSE);
 376         gtk_tree_view_column_set_cell_data_func(column, renderer,
 377                                                 text_cell_data, NULL, NULL);
 378
 379         sel = gtk_tree_view_get_selection (GTK_TREE_VIEW(obj));
 380         gtk_tree_selection_set_mode (sel, GTK_SELECTION_SINGLE);
 381
 382         gtk_tree_view_column_set_spacing (column, 2);
 383         gtk_tree_view_column_set_resizable (column, TRUE);
 384         gtk_tree_view_column_set_fixed_width (column, TRUE);
 385         gtk_tree_view_set_headers_clickable (GTK_TREE_VIEW(obj), FALSE);
 386         gtk_tree_view_set_enable_search     (GTK_TREE_VIEW(obj), FALSE);
 387
 388         setup_drag_and_drop (GTK_TREE_VIEW(obj));
 389 }
 390
 391 static void
 392 tny_account_store_view_init (gpointer g, gpointer iface_data)
 393 {
 394         TnyAccountStoreViewIface *klass = (TnyAccountStoreViewIface *)g;
 395
 396         klass->set_account_store_func = modest_folder_view_set_account_store;
 397
 398         return;
 399 }
 400
 401 static void
 402 modest_folder_view_finalize (GObject *obj)
 403 {
 404         ModestFolderViewPrivate *priv;
 405         GtkTreeSelection    *sel;
 406
 407         g_return_if_fail (obj);
 408
 409         priv =  MODEST_FOLDER_VIEW_GET_PRIVATE(obj);
 410
 411         if (priv->timer_expander != 0) {
 412                 g_source_remove (priv->timer_expander);
 413                 priv->timer_expander = 0;
 414         }
 415
 416         if (priv->account_store) {
 417                 g_signal_handler_disconnect (G_OBJECT(priv->account_store),
 418                                              priv->account_update_signal);
 419                 g_signal_handler_disconnect (G_OBJECT(priv->account_store),
 420                                              priv->accounts_reloaded_signal);
 421                 g_object_unref (G_OBJECT(priv->account_store));
 422                 priv->account_store = NULL;
 423         }
 424
 425         if (priv->lock) {
 426                 g_mutex_free (priv->lock);
 427                 priv->lock = NULL;
 428         }
 429
 430         if (priv->query) {
 431                 g_object_unref (G_OBJECT (priv->query));
 432                 priv->query = NULL;
 433         }
 434
 435         sel = gtk_tree_view_get_selection (GTK_TREE_VIEW(obj));
 436         if (sel)
 437                 g_signal_handler_disconnect (G_OBJECT(sel), priv->changed_signal);
 438
 439         G_OBJECT_CLASS(parent_class)->finalize (obj);
 440 }
 441
 442
 443 static void
 444 modest_folder_view_set_account_store (TnyAccountStoreView *self, TnyAccountStore *account_store)
 445 {
 446         ModestFolderViewPrivate *priv;
 447         TnyDevice *device;
 448
 449         g_return_if_fail (MODEST_IS_FOLDER_VIEW (self));
 450         g_return_if_fail (TNY_IS_ACCOUNT_STORE (account_store));
 451
 452         priv = MODEST_FOLDER_VIEW_GET_PRIVATE (self);
 453         device = tny_account_store_get_device (account_store);
 454
 455         if (G_UNLIKELY (priv->account_store)) {
 456
 457                 if (g_signal_handler_is_connected (G_OBJECT (priv->account_store),
 458                                                    priv->account_update_signal))
 459                         g_signal_handler_disconnect (G_OBJECT (priv->account_store),
 460                                                      priv->account_update_signal);
 461                 if (g_signal_handler_is_connected (G_OBJECT (priv->account_store),
 462                                                    priv->accounts_reloaded_signal))
 463                         g_signal_handler_disconnect (G_OBJECT (priv->account_store),
 464                                                      priv->accounts_reloaded_signal);
 465
 466                 g_object_unref (G_OBJECT (priv->account_store));
 467         }
 468
 469         priv->account_store = g_object_ref (G_OBJECT (account_store));
 470
 471         priv->account_update_signal =
 472                 g_signal_connect (G_OBJECT(account_store), "account_update",
 473                                   G_CALLBACK (on_account_update), self);
 474
 475         priv->accounts_reloaded_signal =
 476                 g_signal_connect (G_OBJECT(account_store), "accounts_reloaded",
 477                                   G_CALLBACK (on_accounts_reloaded), self);
 478
 479         if (!update_model (MODEST_FOLDER_VIEW (self),
 480                            MODEST_TNY_ACCOUNT_STORE (priv->account_store)))
 481                 g_printerr ("modest: failed to update model\n");
 482
 483         g_object_unref (G_OBJECT (device));
 484 }
 485
 486 static void
 487 on_account_update (TnyAccountStore *account_store, const gchar *account,
 488                    gpointer user_data)
 489 {
 490         if (!update_model (MODEST_FOLDER_VIEW(user_data),
 491                            MODEST_TNY_ACCOUNT_STORE(account_store)))
 492                 g_printerr ("modest: failed to update model for changes in '%s'",
 493                             account);
 494 }
 495
 496 static void
 497 on_accounts_reloaded   (TnyAccountStore *account_store,
 498                         gpointer user_data)
 499 {
 500         update_model (MODEST_FOLDER_VIEW (user_data),
 501                       MODEST_TNY_ACCOUNT_STORE(account_store));
 502 }
 503
 504 void
 505 modest_folder_view_set_title (ModestFolderView *self, const gchar *title)
 506 {
 507         GtkTreeViewColumn *col;
 508
 509         g_return_if_fail (self);
 510
 511         col = gtk_tree_view_get_column (GTK_TREE_VIEW(self), 0);
 512         if (!col) {
 513                 g_printerr ("modest: failed get column for title\n");
 514                 return;
 515         }
 516
 517         gtk_tree_view_column_set_title (col, title);
 518         gtk_tree_view_set_headers_visible (GTK_TREE_VIEW(self),
 519                                            title != NULL);
 520 }
 521
 522 GtkWidget*
 523 modest_folder_view_new (TnyFolderStoreQuery *query)
 524 {
 525         GObject *self;
 526         ModestFolderViewPrivate *priv;
 527         GtkTreeSelection *sel;
 528
 529         self = G_OBJECT (g_object_new (MODEST_TYPE_FOLDER_VIEW, NULL));
 530         priv = MODEST_FOLDER_VIEW_GET_PRIVATE (self);
 531
 532         priv->query = g_object_ref (query);
 533
 534         sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(self));
 535         priv->changed_signal = g_signal_connect (sel, "changed",
 536                                                  G_CALLBACK (on_selection_changed), self);
 537         return GTK_WIDGET(self);
 538 }
 539
 540
 541 static gboolean
 542 update_model_empty (ModestFolderView *self)
 543 {
 544         ModestFolderViewPrivate *priv;
 545
 546         g_return_val_if_fail (self, FALSE);
 547         priv = MODEST_FOLDER_VIEW_GET_PRIVATE(self);
 548
 549         g_mutex_lock (priv->lock);
 550         {
 551                 if (priv->monitor) {
 552                         tny_folder_monitor_stop (priv->monitor);
 553                         g_object_unref(G_OBJECT(priv->monitor));
 554                         priv->monitor = NULL;
 555                 }
 556         }
 557         g_mutex_unlock (priv->lock);
 558
 559         g_signal_emit (G_OBJECT(self), signals[FOLDER_SELECTION_CHANGED_SIGNAL], 0,
 560                        NULL, TRUE);
 561         return TRUE;
 562 }
 563
 564
 565 /* this feels dirty; any other way to expand all the root items? */
 566 static void
 567 expand_root_items (ModestFolderView *self)
 568 {
 569         GtkTreePath *path;
 570         path = gtk_tree_path_new_first ();
 571
 572         /* all folders should have child items, so.. */
 573         while (gtk_tree_view_expand_row (GTK_TREE_VIEW(self), path, FALSE))
 574                 gtk_tree_path_next (path);
 575
 576         gtk_tree_path_free (path);
 577 }
 578
 579 static gboolean
 580 update_model (ModestFolderView *self, ModestTnyAccountStore *account_store)
 581 {
 582         ModestFolderViewPrivate *priv;
 583
 584         TnyList          *account_list;
 585         GtkTreeModel     *model, *sortable;
 586
 587         g_return_val_if_fail (account_store, FALSE);
 588
 589         priv =  MODEST_FOLDER_VIEW_GET_PRIVATE(self);
 590
 591         /* Notify that there is no folder selected */
 592         update_model_empty (self);
 593
 594         /* FIXME: the local accounts are not shown when the query
 595            selects only the subscribed folders. */
 596 /*      model        = tny_gtk_folder_store_tree_model_new (TRUE, priv->query); */
 597         model        = tny_gtk_folder_store_tree_model_new (TRUE, NULL);
 598         account_list = TNY_LIST(model);
 599
 600         tny_account_store_get_accounts (TNY_ACCOUNT_STORE(account_store),
 601                                         account_list,
 602                                         TNY_ACCOUNT_STORE_STORE_ACCOUNTS);
 603         if (account_list) {
 604                 sortable = gtk_tree_model_sort_new_with_model (model);
 605                 gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE(sortable),
 606                                                       TNY_GTK_FOLDER_STORE_TREE_MODEL_NAME_COLUMN,
 607                                                       GTK_SORT_ASCENDING);
 608                 gtk_tree_sortable_set_sort_func (GTK_TREE_SORTABLE (sortable),
 609                                                  TNY_GTK_FOLDER_STORE_TREE_MODEL_NAME_COLUMN,
 610                                                  cmp_rows, NULL, NULL);
 611
 612                 /* Set new model */
 613                 gtk_tree_view_set_model (GTK_TREE_VIEW(self), sortable);
 614                 expand_root_items (self); /* expand all account folders */
 615                 g_object_unref (account_list);
 616         }
 617
 618         return TRUE;
 619 }
 620
 621
 622 static void
 623 on_selection_changed (GtkTreeSelection *sel, gpointer user_data)
 624 {
 625         GtkTreeModel            *model_sort, *model;
 626         TnyFolder               *folder = NULL;
 627         GtkTreeIter             iter, iter_sort;
 628         GtkTreePath            *path;
 629         ModestFolderView        *tree_view;
 630         ModestFolderViewPrivate *priv;
 631         gint                    type;
 632
 633         g_return_if_fail (sel);
 634         g_return_if_fail (user_data);
 635
 636         priv = MODEST_FOLDER_VIEW_GET_PRIVATE(user_data);
 637         priv->cur_selection = sel;
 638
 639         /* folder was _un_selected if true */
 640         if (!gtk_tree_selection_get_selected (sel, &model_sort, &iter_sort)) {
 641                 priv->cur_folder = NULL; /* FIXME: need this? */
 642                 gtk_tree_row_reference_free (priv->cur_row);
 643                 priv->cur_row = NULL;
 644                 return;
 645         }
 646
 647         model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT (model_sort));
 648         gtk_tree_model_sort_convert_iter_to_child_iter (GTK_TREE_MODEL_SORT (model_sort),
 649                                                         &iter,
 650                                                         &iter_sort);
 651
 652         tree_view = MODEST_FOLDER_VIEW (user_data);
 653
 654         gtk_tree_model_get (model, &iter,
 655                             TNY_GTK_FOLDER_STORE_TREE_MODEL_TYPE_COLUMN, &type,
 656                             TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN, &folder,
 657                             -1);
 658
 659         if (type == TNY_FOLDER_TYPE_ROOT) {
 660                 g_object_unref (folder);
 661                 return;
 662         }
 663
 664         /* Current folder was unselected */
 665         g_signal_emit (G_OBJECT(tree_view), signals[FOLDER_SELECTION_CHANGED_SIGNAL], 0,
 666                        priv->cur_folder, FALSE);
 667
 668         if (priv->cur_row) {
 669 /*              tny_folder_sync (priv->cur_folder, TRUE, NULL); /\* FIXME *\/ */
 670                 gtk_tree_row_reference_free (priv->cur_row);
 671         }
 672
 673         /* New current references */
 674         path = gtk_tree_model_get_path (model_sort, &iter_sort);
 675         priv->cur_folder = folder;
 676         priv->cur_row = gtk_tree_row_reference_new (model_sort, path);
 677
 678         /* Frees */
 679         gtk_tree_path_free (path);
 680         g_object_unref (G_OBJECT (folder));
 681
 682         /* New folder has been selected */
 683         g_signal_emit (G_OBJECT(tree_view),
 684                        signals[FOLDER_SELECTION_CHANGED_SIGNAL],
 685                        0, folder, TRUE);
 686 }
 687
 688 TnyFolder *
 689 modest_folder_view_get_selected (ModestFolderView *self)
 690 {
 691         ModestFolderViewPrivate *priv;
 692
 693         g_return_val_if_fail (self, NULL);
 694
 695         priv = MODEST_FOLDER_VIEW_GET_PRIVATE(self);
 696         if (priv->cur_folder)
 697                 g_object_ref (priv->cur_folder);
 698
 699         return priv->cur_folder;
 700 }
 701
 702 static gboolean
 703 get_model_iter (ModestFolderView *self,
 704                 GtkTreeModel **model,
 705                 GtkTreeIter *iter)
 706 {
 707         GtkTreeModel *model_sort;
 708         GtkTreeIter iter_sort;
 709         GtkTreePath *path;
 710         ModestFolderViewPrivate *priv;
 711
 712         priv = MODEST_FOLDER_VIEW_GET_PRIVATE(self);
 713
 714         if (!priv->cur_folder)
 715                 return FALSE;
 716
 717         if (!gtk_tree_row_reference_valid (priv->cur_row))
 718                 return FALSE;
 719
 720         model_sort = gtk_tree_view_get_model (GTK_TREE_VIEW (self));
 721         *model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT (model_sort));
 722
 723         /* Get path to retrieve iter */
 724         path = gtk_tree_row_reference_get_path (priv->cur_row);
 725         if (!gtk_tree_model_get_iter (model_sort, &iter_sort, path))
 726                 return FALSE;
 727
 728         gtk_tree_model_sort_convert_iter_to_child_iter (GTK_TREE_MODEL_SORT (model_sort),
 729                                                         iter,
 730                                                         &iter_sort);
 731         return TRUE;
 732 }
 733
 734 gboolean
 735 modest_folder_view_rename (ModestFolderView *self)
 736 {
 737         GtkTreeModel *model;
 738         GtkTreeIter iter;
 739         ModestFolderViewPrivate *priv;
 740
 741         g_return_val_if_fail (MODEST_IS_FOLDER_VIEW (self), FALSE);
 742
 743         priv = MODEST_FOLDER_VIEW_GET_PRIVATE(self);
 744
 745         if (!get_model_iter (self, &model, &iter))
 746                 return FALSE;
 747
 748         /* Set new name */
 749         gtk_tree_store_set (GTK_TREE_STORE (model), &iter,
 750                             TNY_GTK_FOLDER_STORE_TREE_MODEL_NAME_COLUMN,
 751                             tny_folder_get_name (priv->cur_folder), -1);
 752
 753         /* Invalidate selection */
 754         g_signal_emit (G_OBJECT(self), signals[FOLDER_SELECTION_CHANGED_SIGNAL], 0,
 755                        priv->cur_folder, TRUE);
 756
 757         return TRUE;
 758 }
 759
 760 gboolean
 761 modest_folder_view_add_subfolder (ModestFolderView *self, TnyFolder *folder)
 762 {
 763         GtkTreeModel *model;
 764         GtkTreeIter iter, child;
 765
 766         g_return_val_if_fail (MODEST_IS_FOLDER_VIEW (self), FALSE);
 767
 768         if (!get_model_iter (self, &model, &iter))
 769                 return FALSE;
 770
 771         /* Append a new child to the folder */
 772         gtk_tree_store_append (GTK_TREE_STORE (model), &child, &iter);
 773         gtk_tree_store_set (GTK_TREE_STORE (model), &child,
 774                             TNY_GTK_FOLDER_STORE_TREE_MODEL_NAME_COLUMN,
 775                             tny_folder_get_name (TNY_FOLDER (folder)),
 776                             TNY_GTK_FOLDER_STORE_TREE_MODEL_UNREAD_COLUMN,
 777                             tny_folder_get_unread_count (TNY_FOLDER (folder)),
 778                             TNY_GTK_FOLDER_STORE_TREE_MODEL_TYPE_COLUMN,
 779                             tny_folder_get_folder_type (TNY_FOLDER (folder)),
 780                             TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN,
 781                             folder, -1);
 782
 783         return TRUE;
 784 }
 785
 786 static gint
 787 cmp_rows (GtkTreeModel *tree_model, GtkTreeIter *iter1, GtkTreeIter *iter2,
 788           gpointer user_data)
 789 {
 790         gint cmp;
 791         gchar         *name1, *name2;
 792         TnyFolderType type;
 793         TnyFolder     *folder1, *folder2;
 794
 795         gtk_tree_model_get (tree_model, iter1,
 796                             TNY_GTK_FOLDER_STORE_TREE_MODEL_NAME_COLUMN, &name1,
 797                             TNY_GTK_FOLDER_STORE_TREE_MODEL_TYPE_COLUMN, &type,
 798                             TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN, &folder1,
 799                             -1);
 800         gtk_tree_model_get (tree_model, iter2,
 801                             TNY_GTK_FOLDER_STORE_TREE_MODEL_NAME_COLUMN, &name2,
 802                             TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN, &folder2,
 803                             -1);
 804
 805         /* local_folders should be the last one */
 806         if (type == TNY_FOLDER_TYPE_ROOT) {
 807                 /* the account name is also the name of the root folder
 808                  * in case of local folders */
 809                 if (name1 && strcmp (name1, MODEST_LOCAL_FOLDERS_ACCOUNT_NAME) == 0)
 810                         cmp = +1;
 811                 else if (name2 && strcmp (name2, MODEST_LOCAL_FOLDERS_ACCOUNT_NAME) == 0)
 812                         cmp = -1;
 813                 else
 814                         cmp = modest_text_utils_utf8_strcmp (name1, name2, TRUE);
 815         } else
 816                 cmp = modest_text_utils_utf8_strcmp (name1, name2, TRUE);
 817
 818
 819         if (folder1)
 820                 g_object_unref(G_OBJECT(folder1));
 821         if (folder2)
 822                 g_object_unref(G_OBJECT(folder2));
 823
 824         g_free (name1);
 825         g_free (name2);
 826
 827         return cmp;
 828 }
 829
 830 /*****************************************************************************/
 831 /*                        DRAG and DROP stuff                                */
 832 /*****************************************************************************/
 833
 834 /*
 835  * This function fills the #GtkSelectionData with the row and the
 836  * model that has been dragged. It's called when this widget is a
 837  * source for dnd after the event drop happened
 838  */
 839 static void
 840 on_drag_data_get (GtkWidget *widget,
 841                   GdkDragContext *context,
 842                   GtkSelectionData *selection_data,
 843                   guint info,
 844                   guint time,
 845                   gpointer data)
 846 {
 847         GtkTreeSelection *selection;
 848         GtkTreeModel *model_sort, *model;
 849         GtkTreeIter iter;
 850         GtkTreePath *source_row_sort;
 851         GtkTreePath *source_row;
 852
 853         selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (widget));
 854         gtk_tree_selection_get_selected (selection, &model_sort, &iter);
 855         source_row_sort = gtk_tree_model_get_path (model_sort, &iter);
 856
 857         /* Get the unsorted path and model */
 858         model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT (model_sort));
 859         source_row = gtk_tree_model_sort_convert_path_to_child_path (GTK_TREE_MODEL_SORT (model_sort),
 860                                                                      source_row_sort);
 861
 862         gtk_tree_set_row_drag_data (selection_data,
 863                                     model,
 864                                     source_row);
 865
 866         gtk_tree_path_free (source_row_sort);
 867         gtk_tree_path_free (source_row);
 868 }
 869
 870 typedef struct _DndHelper
 871 {
 872         gboolean delete_source;
 873         GtkWidget *source_widget;
 874         GtkWidget *dest_widget;
 875         GtkTreePath *source_row;
 876         GdkDragContext *context;
 877         guint time;
 878 } DndHelper;
 879
 880
 881 /*
 882  * This function saves the source row in the source widget, will be
 883  * used by the drag-data-delete handler to remove the source row
 884  */
 885 static void
 886 save_and_clean (DndHelper *helper,
 887                 gboolean success)
 888 {
 889         /* Save row data */
 890         if (success && helper->delete_source)
 891                 g_object_set_data (G_OBJECT (helper->source_widget),
 892                                    ROW_REF_DATA_NAME,
 893                                    gtk_tree_path_copy (helper->source_row));
 894
 895         /* Clean dest row */
 896         gtk_tree_view_set_drag_dest_row (GTK_TREE_VIEW (helper->dest_widget),
 897                                          NULL,
 898                                          GTK_TREE_VIEW_DROP_BEFORE);
 899
 900 }
 901
 902 /*
 903  * This function is the callback of the
 904  * modest_mail_operation_xfer_msg() call. We check here if the message
 905  * was correctly asynchronously transfered
 906  */
 907 static void
 908 on_progress_changed (ModestMailOperation *mail_op, gpointer user_data)
 909 {
 910         ModestMailOperationQueue *queue;
 911         gboolean success = FALSE;
 912         DndHelper *helper;
 913
 914         helper = (DndHelper *) user_data;
 915
 916         if (modest_mail_operation_get_status (mail_op) ==
 917             MODEST_MAIL_OPERATION_STATUS_SUCCESS)
 918                 success = TRUE;
 919
 920         /* Remove the mail operation */
 921         queue = modest_runtime_get_mail_operation_queue ();
 922         modest_mail_operation_queue_remove (queue, mail_op);
 923         g_object_unref (G_OBJECT (mail_op));
 924
 925         /* Save and clean */
 926         save_and_clean (helper, success);
 927
 928         /* Notify the drag source */
 929         gtk_drag_finish (helper->context, success, (success && helper->delete_source), helper->time);
 930
 931         /* Free the helper */
 932         g_slice_free (DndHelper, helper);
 933 }
 934
 935 /*
 936  * This function is used by drag_data_received_cb to manage drag and
 937  * drop of a header, i.e, and drag from the header view to the folder
 938  * view.
 939  */
 940 static void
 941 drag_and_drop_from_header_view (GtkTreeModel *source_model,
 942                                 GtkTreeModel *dest_model,
 943                                 GtkTreePath  *dest_row,
 944                                 DndHelper    *helper)
 945 {
 946         TnyHeader *header;
 947         TnyFolder *folder;
 948         ModestMailOperationQueue *queue;
 949         ModestMailOperation *mail_op;
 950         gboolean started;
 951         GtkTreeIter source_iter, dest_iter;
 952
 953         /* Get header */
 954         gtk_tree_model_get_iter (source_model, &source_iter, helper->source_row);
 955         gtk_tree_model_get (source_model, &source_iter,
 956                             TNY_GTK_HEADER_LIST_MODEL_INSTANCE_COLUMN,
 957                             &header, -1);
 958
 959         /* Get Folder */
 960         gtk_tree_model_get_iter (dest_model, &dest_iter, dest_row);
 961         gtk_tree_model_get (dest_model, &dest_iter,
 962                             TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN,
 963                             &folder, -1);
 964
 965         /* Transfer message */
 966         queue = modest_runtime_get_mail_operation_queue ();
 967         mail_op = modest_mail_operation_new ();
 968         started = modest_mail_operation_xfer_msg (mail_op, header,
 969                                                   folder, helper->delete_source);
 970         if (started) {
 971                 g_signal_connect (G_OBJECT (mail_op), "progress_changed",
 972                                   G_CALLBACK (on_progress_changed), helper);
 973                 modest_mail_operation_queue_add (queue, mail_op);
 974         } else {
 975                 const GError *error;
 976                 error = modest_mail_operation_get_error (mail_op);
 977                 g_warning ("Error trying to transfer messages: %s\n",
 978                            error->message);
 979
 980                 g_slice_free (DndHelper, helper);
 981         }
 982
 983         /* Frees */
 984         g_object_unref (G_OBJECT (mail_op));
 985         g_object_unref (G_OBJECT (header));
 986         g_object_unref (G_OBJECT (folder));
 987 }
 988
 989 /*
 990  * This function is used by drag_data_received_cb to manage drag and
 991  * drop of a folder, i.e, and drag from the folder view to the same
 992  * folder view.
 993  */
 994 static void
 995 drag_and_drop_from_folder_view (GtkTreeModel     *source_model,
 996                                 GtkTreeModel     *dest_model,
 997                                 GtkTreePath      *dest_row,
 998                                 GtkSelectionData *selection_data,
 999                                 DndHelper        *helper)
1000 {
1001         ModestMailOperation *mail_op;
1002         const GError *error;
1003         GtkTreeRowReference *source_row_reference;
1004         GtkTreeIter parent_iter, iter;
1005         TnyFolder *folder, *new_folder;
1006         TnyFolderStore *parent_folder;
1007         gboolean success = FALSE;
1008
1009         /* Check if the drag is possible */
1010         if (!gtk_tree_path_compare (helper->source_row, dest_row))
1011                 goto out;
1012
1013         if (!gtk_tree_drag_dest_row_drop_possible (GTK_TREE_DRAG_DEST (dest_model),
1014                                                    dest_row,
1015                                                    selection_data))
1016                 goto out;
1017
1018         /* Get data */
1019         gtk_tree_model_get_iter (source_model, &parent_iter, dest_row);
1020         gtk_tree_model_get_iter (source_model, &iter, helper->source_row);
1021         gtk_tree_model_get (source_model, &parent_iter,
1022                             TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN,
1023                             &parent_folder, -1);
1024         gtk_tree_model_get (source_model, &iter,
1025                             TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN,
1026                             &folder, -1);
1027
1028         /* Do the mail operation */
1029         mail_op = modest_mail_operation_new ();
1030         new_folder = modest_mail_operation_xfer_folder (mail_op, folder, parent_folder,
1031                                                         helper->delete_source);
1032
1033         g_object_unref (G_OBJECT (parent_folder));
1034         g_object_unref (G_OBJECT (folder));
1035
1036         error = modest_mail_operation_get_error (mail_op);
1037         if (error) {
1038                 g_warning ("Error transferring folder: %s\n", error->message);
1039                 g_object_unref (G_OBJECT (mail_op));
1040                 goto out;
1041         }
1042         g_object_unref (G_OBJECT (mail_op));
1043
1044         /* Get a row reference to the source path because the path
1045            could change after the insertion. The gtk_drag_finish() is
1046            not able to delete the source because that, so we have to
1047            do it manually */
1048         source_row_reference = gtk_tree_row_reference_new (source_model, helper->source_row);
1049         gtk_tree_path_free (helper->source_row);
1050
1051         /* Insert the dragged row as a child of the dest row */
1052         gtk_tree_path_down (dest_row);
1053         if (gtk_tree_drag_dest_drag_data_received (GTK_TREE_DRAG_DEST (dest_model),
1054                                                    dest_row,
1055                                                    selection_data)) {
1056
1057                 GtkTreeIter iter;
1058
1059                 /* Set the newly created folder as the instance in the row */
1060                 gtk_tree_model_get_iter (dest_model, &iter, dest_row);
1061                 gtk_tree_store_set (GTK_TREE_STORE (dest_model), &iter,
1062                                     TNY_GTK_FOLDER_STORE_TREE_MODEL_INSTANCE_COLUMN,
1063                                     new_folder, -1);
1064                 g_object_unref (G_OBJECT (new_folder));
1065
1066                 helper->source_row = gtk_tree_row_reference_get_path (source_row_reference);
1067
1068                 success = TRUE;
1069         }
1070         gtk_tree_row_reference_free (source_row_reference);
1071
1072         /* Save and clean */
1073         save_and_clean (helper, success);
1074
1075  out:
1076         gtk_drag_finish (helper->context, success, (success && helper->delete_source), helper->time);
1077 }
1078
1079 /*
1080  * This function receives the data set by the "drag-data-get" signal
1081  * handler. This information comes within the #GtkSelectionData. This
1082  * function will manage both the drags of folders of the treeview and
1083  * drags of headers of the header view widget.
1084  */
1085 static void
1086 on_drag_data_received (GtkWidget *widget,
1087                        GdkDragContext *context,
1088                        gint x,
1089                        gint y,
1090                        GtkSelectionData *selection_data,
1091                        guint target_type,
1092                        guint time,
1093                        gpointer data)
1094 {
1095         GtkWidget *source_widget;
1096         GtkTreeModel *model_sort, *dest_model, *source_model;
1097         GtkTreePath *source_row, *dest_row;
1098         GtkTreeViewDropPosition pos;
1099         gboolean success = FALSE, delete_source = FALSE;
1100         DndHelper *helper;
1101
1102         /* Do not allow further process */
1103         g_signal_stop_emission_by_name (widget, "drag-data-received");
1104
1105         /* Get the action */
1106         if (context->action == GDK_ACTION_MOVE)
1107                 delete_source = TRUE;
1108
1109         /* Check if the get_data failed */
1110         if (selection_data == NULL || selection_data->length < 0)
1111                 gtk_drag_finish (context, success, (success && delete_source), time);
1112
1113         /* Get the models */
1114         source_widget = gtk_drag_get_source_widget (context);
1115         model_sort = gtk_tree_view_get_model (GTK_TREE_VIEW (widget));
1116         gtk_tree_get_row_drag_data (selection_data,
1117                                     &source_model,
1118                                     &source_row);
1119
1120         /* Select the destination model */
1121         if (source_widget == widget)
1122                 dest_model = source_model;
1123         else
1124                 dest_model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT (model_sort));
1125
1126
1127         /* Get the path to the destination row. Can not call
1128            gtk_tree_view_get_drag_dest_row() because the source row
1129            is not selected anymore */
1130         gtk_tree_view_get_dest_row_at_pos (GTK_TREE_VIEW (widget), x, y,
1131                                            &dest_row, &pos);
1132
1133         /* Only allow drops IN other rows */
1134         if (!dest_row || pos == GTK_TREE_VIEW_DROP_BEFORE || pos == GTK_TREE_VIEW_DROP_AFTER)
1135                 gtk_drag_finish (context, success, (success && delete_source), time);
1136
1137         /* Create the helper */
1138         helper = g_slice_new0 (DndHelper);
1139 /*      helper->selection_data = selection_data; */
1140         helper->delete_source = delete_source;
1141         helper->source_widget = source_widget;
1142         helper->dest_widget = widget;
1143         helper->source_row = source_row;
1144         helper->context = context;
1145         helper->time = time;
1146
1147         /* Drags from the header view */
1148         if ((target_type == FOLDER_ROW) && (source_widget != widget)) {
1149
1150                 drag_and_drop_from_header_view (source_model,
1151                                                 dest_model,
1152                                                 dest_row,
1153                                                 helper);
1154
1155                 gtk_tree_path_free (dest_row);
1156
1157         } else {
1158                 GtkTreePath *child_dest_row;
1159
1160                 /* Get path from the unsorted model */
1161                 child_dest_row =
1162                         gtk_tree_model_sort_convert_path_to_child_path (GTK_TREE_MODEL_SORT (model_sort),
1163                                                                         dest_row);
1164                 gtk_tree_path_free (dest_row);
1165
1166                 drag_and_drop_from_folder_view (source_model,
1167                                                 dest_model,
1168                                                 child_dest_row,
1169                                                 selection_data,
1170                                                 helper);
1171                 gtk_tree_path_free (child_dest_row);
1172         }
1173 }
1174
1175 /*
1176  * We define a "drag-drop" signal handler because we do not want to
1177  * use the default one, because the default one always calls
1178  * gtk_drag_finish and we prefer to do it in the "drag-data-received"
1179  * signal handler, because there we have all the information available
1180  * to know if the dnd was a success or not.
1181  */
1182 static gboolean
1183 drag_drop_cb (GtkWidget      *widget,
1184               GdkDragContext *context,
1185               gint            x,
1186               gint            y,
1187               guint           time,
1188               gpointer        user_data)
1189 {
1190         if (!context->targets)
1191                 return FALSE;
1192
1193         /* Request the data from the source. */
1194         gtk_drag_get_data(widget,
1195                           context,
1196                           GDK_POINTER_TO_ATOM (context->targets->data),
1197                           time);
1198
1199     return TRUE;
1200 }
1201
1202 /*
1203  * This function deletes the data that has been dragged from its
1204  * source widget. Since is a function received by the source of the
1205  * drag, this function only deletes rows of the folder view
1206  * widget. The header view widget will need to define its own one.
1207  */
1208 static void
1209 drag_data_delete_cb (GtkWidget      *widget,
1210                      GdkDragContext *context,
1211                      gpointer        user_data)
1212 {
1213         GtkTreePath *source_row;
1214         GtkTreeModel *model_sort, *model;
1215
1216         model_sort = gtk_tree_view_get_model (GTK_TREE_VIEW (widget));
1217         model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT (model_sort));
1218         source_row = g_object_steal_data (G_OBJECT (widget), ROW_REF_DATA_NAME);
1219
1220         /* Delete the source row */
1221         gtk_tree_drag_source_drag_data_delete (GTK_TREE_DRAG_SOURCE (model),
1222                                                source_row);
1223
1224         gtk_tree_path_free (source_row);
1225 }
1226
1227 /*
1228  * This function expands a node of a tree view if it's not expanded
1229  * yet. Not sure why it needs the threads stuff, but gtk+`example code
1230  * does that, so that's why they're here.
1231  */
1232 static gint
1233 expand_row_timeout (gpointer data)
1234 {
1235         GtkTreeView *tree_view = data;
1236         GtkTreePath *dest_path = NULL;
1237         GtkTreeViewDropPosition pos;
1238         gboolean result = FALSE;
1239
1240         GDK_THREADS_ENTER ();
1241
1242         gtk_tree_view_get_drag_dest_row (tree_view,
1243                                          &dest_path,
1244                                          &pos);
1245
1246         if (dest_path &&
1247             (pos == GTK_TREE_VIEW_DROP_INTO_OR_AFTER ||
1248              pos == GTK_TREE_VIEW_DROP_INTO_OR_BEFORE)) {
1249                 gtk_tree_view_expand_row (tree_view, dest_path, FALSE);
1250                 gtk_tree_path_free (dest_path);
1251         }
1252         else {
1253                 if (dest_path)
1254                         gtk_tree_path_free (dest_path);
1255
1256                 result = TRUE;
1257         }
1258
1259         GDK_THREADS_LEAVE ();
1260
1261         return result;
1262 }
1263
1264 /*
1265  * This function is called whenever the pointer is moved over a widget
1266  * while dragging some data. It installs a timeout that will expand a
1267  * node of the treeview if not expanded yet. This function also calls
1268  * gdk_drag_status in order to set the suggested action that will be
1269  * used by the "drag-data-received" signal handler to know if we
1270  * should do a move or just a copy of the data.
1271  */
1272 static gboolean
1273 on_drag_motion (GtkWidget      *widget,
1274                 GdkDragContext *context,
1275                 gint            x,
1276                 gint            y,
1277                 guint           time,
1278                 gpointer        user_data)
1279 {
1280         GtkTreeViewDropPosition pos;
1281         GtkTreePath *dest_row;
1282         ModestFolderViewPrivate *priv;
1283         GdkDragAction suggested_action;
1284
1285         priv = MODEST_FOLDER_VIEW_GET_PRIVATE (widget);
1286
1287         if (priv->timer_expander != 0) {
1288                 g_source_remove (priv->timer_expander);
1289                 priv->timer_expander = 0;
1290         }
1291
1292         gtk_tree_view_get_dest_row_at_pos (GTK_TREE_VIEW (widget),
1293                                            x, y,
1294                                            &dest_row,
1295                                            &pos);
1296
1297         if (!dest_row)
1298                 return FALSE;
1299
1300         /* Expand the selected row after 1/2 second */
1301         if (!gtk_tree_view_row_expanded (GTK_TREE_VIEW (widget), dest_row)) {
1302                 gtk_tree_view_set_drag_dest_row (GTK_TREE_VIEW (widget), dest_row, pos);
1303                 priv->timer_expander = g_timeout_add (500, expand_row_timeout, widget);
1304         }
1305         gtk_tree_path_free (dest_row);
1306
1307         /* Select the desired action. By default we pick MOVE */
1308         suggested_action = GDK_ACTION_MOVE;
1309
1310         if (context->actions == GDK_ACTION_COPY)
1311             gdk_drag_status(context, GDK_ACTION_COPY, time);
1312         else if (context->actions == GDK_ACTION_MOVE)
1313             gdk_drag_status(context, GDK_ACTION_MOVE, time);
1314         else if (context->actions & suggested_action)
1315             gdk_drag_status(context, suggested_action, time);
1316         else
1317             gdk_drag_status(context, GDK_ACTION_DEFAULT, time);
1318
1319         return TRUE;
1320 }
1321
1322
1323 /* Folder view drag types */
1324 const GtkTargetEntry folder_view_drag_types[] =
1325 {
1326         { "GTK_TREE_MODEL_ROW", GTK_TARGET_SAME_WIDGET, FOLDER_ROW },
1327 };
1328
1329 /*
1330  * This function sets the treeview as a source and a target for dnd
1331  * events. It also connects all the requirede signals.
1332  */
1333 static void
1334 setup_drag_and_drop (GtkTreeView *self)
1335 {
1336         /* Set up the folder view as a dnd destination. Set only the
1337            highlight flag, otherwise gtk will have a different
1338            behaviour */
1339         gtk_drag_dest_set (GTK_WIDGET (self),
1340                            GTK_DEST_DEFAULT_HIGHLIGHT,
1341                            folder_view_drag_types,
1342                            G_N_ELEMENTS (folder_view_drag_types),
1343                            GDK_ACTION_MOVE | GDK_ACTION_COPY);
1344
1345         gtk_signal_connect(GTK_OBJECT (self),
1346                            "drag_data_received",
1347                            GTK_SIGNAL_FUNC(on_drag_data_received),
1348                            NULL);
1349
1350
1351         /* Set up the treeview as a dnd source */
1352         gtk_drag_source_set (GTK_WIDGET (self),
1353                              GDK_BUTTON1_MASK,
1354                              folder_view_drag_types,
1355                              G_N_ELEMENTS (folder_view_drag_types),
1356                              GDK_ACTION_MOVE | GDK_ACTION_COPY);
1357
1358         gtk_signal_connect(GTK_OBJECT (self),
1359                            "drag_data_delete",
1360                            GTK_SIGNAL_FUNC(drag_data_delete_cb),
1361                            NULL);
1362
1363         gtk_signal_connect(GTK_OBJECT (self),
1364                            "drag_motion",
1365                            GTK_SIGNAL_FUNC(on_drag_motion),
1366                            NULL);
1367
1368
1369         gtk_signal_connect(GTK_OBJECT (self),
1370                            "drag_data_get",
1371                            GTK_SIGNAL_FUNC(on_drag_data_get),
1372                            NULL);
1373
1374         gtk_signal_connect(GTK_OBJECT (self),
1375                            "drag_drop",
1376                            GTK_SIGNAL_FUNC(drag_drop_cb),
1377                            NULL);
1378 }