backend/ev-page-cache.c

   1 #include "ev-page-cache.h"
   2 #include "ev-job-queue.h"
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 typedef struct _EvPageCacheInfo
   7 {
   8         double width;
   9         double height;
  10 }
  11 EvPageCacheInfo;
  12
  13
  14 struct _EvPageCache
  15 {
  16         GObject parent;
  17
  18         gint current_page;
  19         int n_pages;
  20         char *title;
  21         char **page_labels;
  22
  23         gboolean uniform;
  24         double uniform_width;
  25         double uniform_height;
  26
  27         EvPageCacheInfo *size_cache;
  28 };
  29
  30 struct _EvPageCacheClass
  31 {
  32         GObjectClass parent_class;
  33
  34         void (* page_changed) (EvPageCache *page_cache, gint page);
  35 };
  36
  37 enum
  38 {
  39         PAGE_CHANGED,
  40         N_SIGNALS,
  41 };
  42
  43 static guint signals[N_SIGNALS] = {0, };
  44
  45 static void ev_page_cache_init       (EvPageCache      *page_cache);
  46 static void ev_page_cache_class_init (EvPageCacheClass *page_cache);
  47 static void ev_page_cache_finalize   (GObject *object);
  48
  49 G_DEFINE_TYPE (EvPageCache, ev_page_cache, G_TYPE_OBJECT)
  50
  51 static void
  52 ev_page_cache_init (EvPageCache *page_cache)
  53 {
  54         page_cache->current_page = -1;
  55 }
  56
  57 static void
  58 ev_page_cache_class_init (EvPageCacheClass *class)
  59 {
  60         GObjectClass *object_class;
  61
  62         object_class = G_OBJECT_CLASS (class);
  63
  64         object_class->finalize = ev_page_cache_finalize;
  65
  66         signals [PAGE_CHANGED] =
  67                 g_signal_new ("page-changed",
  68                               EV_TYPE_PAGE_CACHE,
  69                               G_SIGNAL_RUN_LAST,
  70                               G_STRUCT_OFFSET (EvPageCacheClass, page_changed),
  71                               NULL, NULL,
  72                               g_cclosure_marshal_VOID__INT,
  73                               G_TYPE_NONE, 1,
  74                               G_TYPE_INT);
  75
  76 }
  77
  78 static void
  79 ev_page_cache_finalize (GObject *object)
  80 {
  81         EvPageCache *page_cache;
  82
  83         page_cache = EV_PAGE_CACHE (object);
  84
  85         g_free (page_cache->title);
  86         g_free (page_cache->size_cache);
  87 }
  88
  89 EvPageCache *
  90 _ev_page_cache_new (EvDocument *document)
  91 {
  92         EvPageCache *page_cache;
  93         EvPageCacheInfo *info;
  94         gint i;
  95
  96         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
  97
  98         g_mutex_lock (EV_DOC_MUTEX);
  99
 100         /* We read page information out of the document */
 101
 102         /* Assume all pages are the same size until proven otherwise */
 103         page_cache->uniform = TRUE;
 104         page_cache->n_pages = ev_document_get_n_pages (document);
 105         page_cache->title = ev_document_get_title (document);
 106         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 107
 108         for (i = 0; i < page_cache->n_pages; i++) {
 109                 double page_width = 0;
 110                 double page_height = 0;
 111
 112                 ev_document_get_page_size (document, i, &page_width, &page_height);
 113                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 114
 115                 if (i == 0) {
 116                         page_cache->uniform_width = page_width;
 117                         page_cache->uniform_height = page_height;
 118                 } else if (page_cache->uniform &&
 119                            (page_cache->uniform_width != page_width ||
 120                             page_cache->uniform_height != page_height)) {
 121                         /* It's a different page size.  Backfill the array. */
 122                         int j;
 123
 124                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 125
 126                         for (j = 0; j < i; j++) {
 127                                 info = &(page_cache->size_cache [j]);
 128                                 info->width = page_cache->uniform_width;
 129                                 info->height = page_cache->uniform_height;
 130                         }
 131                         page_cache->uniform = FALSE;
 132
 133                 }
 134
 135                 if (! page_cache->uniform) {
 136                         info = &(page_cache->size_cache [i]);
 137
 138                         info->width = page_width;
 139                         info->height = page_height;
 140                 }
 141         }
 142
 143         /* make some sanity check assertions */
 144         if (! page_cache->uniform)
 145                 g_assert (page_cache->size_cache != NULL);
 146
 147         g_mutex_unlock (EV_DOC_MUTEX);
 148
 149         if (page_cache->n_pages > 0)
 150                 ev_page_cache_set_current_page (page_cache, 0);
 151
 152         return page_cache;
 153 }
 154
 155 gint
 156 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 157 {
 158         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 159
 160         return page_cache->n_pages;
 161 }
 162
 163 gint
 164 ev_page_cache_get_current_page (EvPageCache *page_cache)
 165 {
 166         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 167
 168         return page_cache->current_page;
 169 }
 170
 171 void
 172 ev_page_cache_set_current_page (EvPageCache *page_cache,
 173                                 int          page)
 174 {
 175         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 176         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 177
 178         if (page == page_cache->current_page)
 179                 return;
 180
 181         page_cache->current_page = page;
 182         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 183 }
 184
 185 gboolean
 186 ev_page_cache_set_page_label (EvPageCache *page_cache,
 187                               const char  *page_label)
 188 {
 189         gint i, page;
 190         long value;
 191         char *endptr = NULL;
 192
 193         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 194         g_return_val_if_fail (page_label != NULL, FALSE);
 195
 196         /* First, look for a literal label match */
 197         for (i = 0; i < page_cache->n_pages; i ++) {
 198                 if (page_cache->page_labels[i] != NULL &&
 199                     ! strcmp (page_label, page_cache->page_labels[i])) {
 200                         ev_page_cache_set_current_page (page_cache, i);
 201                         return TRUE;
 202                 }
 203         }
 204
 205         /* Next, parse the label, and see if the number fits */
 206         value = strtol (page_label, &endptr, 10);
 207         if (endptr[0] == '\0') {
 208                 /* Page number is an integer */
 209                 page = MIN (G_MAXINT, value);
 210
 211                 /* convert from a page label to a page offset */
 212                 page --;
 213                 if (page >= 0 &&
 214                     page < page_cache->n_pages &&
 215                     page_cache->page_labels[page] == NULL) {
 216                         ev_page_cache_set_current_page (page_cache, page);
 217                         return TRUE;
 218                 }
 219         }
 220
 221         return FALSE;
 222 }
 223
 224 void
 225 ev_page_cache_set_link (EvPageCache *page_cache,
 226                         EvLink      *link)
 227 {
 228         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 229         g_return_if_fail (EV_IS_LINK (link));
 230
 231         ev_page_cache_set_current_page (page_cache, ev_link_get_page (link));
 232 }
 233
 234 char *
 235 ev_page_cache_get_title (EvPageCache *page_cache)
 236 {
 237         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 238
 239         return page_cache->title;
 240 }
 241
 242 void
 243 ev_page_cache_get_size (EvPageCache *page_cache,
 244                         gint         page,
 245                         gfloat       scale,
 246                         gint        *width,
 247                         gint        *height)
 248 {
 249         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 250         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 251
 252         if (page_cache->uniform) {
 253                 if (width)
 254                         *width = page_cache->uniform_width;
 255                 if (height)
 256                         *height = page_cache->uniform_height;
 257         } else {
 258                 EvPageCacheInfo *info;
 259
 260                 info = &(page_cache->size_cache [page]);
 261
 262                 if (width)
 263                         *width = info->width;
 264                 if (height)
 265                         *height = info->height;
 266         }
 267
 268         if (width)
 269                 *width = (*width) * scale;
 270         if (width)
 271                 *height = (*height) * scale;
 272
 273 }
 274 gchar *
 275 ev_page_cache_get_page_label (EvPageCache *page_cache,
 276                               gint         page)
 277 {
 278         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 279         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 280
 281         if (page_cache->page_labels[page] == NULL)
 282                 return g_strdup_printf ("%d", page + 1);
 283
 284         return g_strdup (page_cache->page_labels[page]);
 285 }
 286
 287
 288 gboolean
 289 ev_page_cache_next_page (EvPageCache *page_cache)
 290 {
 291         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 292
 293         if (page_cache->current_page >= page_cache->n_pages - 1)
 294                 return FALSE;
 295
 296         ev_page_cache_set_current_page (page_cache, page_cache->current_page + 1);
 297         return TRUE;
 298
 299 }
 300
 301 gboolean
 302 ev_page_cache_prev_page (EvPageCache *page_cache)
 303 {
 304         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 305
 306         if (page_cache->current_page <= 0)
 307                 return FALSE;
 308
 309         ev_page_cache_set_current_page (page_cache, page_cache->current_page - 1);
 310         return TRUE;
 311 }
 312