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         return page_cache;
 150 }
 151
 152 gint
 153 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 154 {
 155         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 156
 157         return page_cache->n_pages;
 158 }
 159
 160 gint
 161 ev_page_cache_get_current_page (EvPageCache *page_cache)
 162 {
 163         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 164
 165         return page_cache->current_page;
 166 }
 167
 168 void
 169 ev_page_cache_set_current_page (EvPageCache *page_cache,
 170                                 int          page)
 171 {
 172         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 173         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 174
 175         if (page == page_cache->current_page)
 176                 return;
 177
 178         page_cache->current_page = page;
 179         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 180 }
 181
 182 gboolean
 183 ev_page_cache_set_page_label (EvPageCache *page_cache,
 184                               const char  *page_label)
 185 {
 186         gint i, page;
 187         long value;
 188         char *endptr = NULL;
 189
 190         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 191         g_return_val_if_fail (page_label != NULL, FALSE);
 192
 193         /* First, look for a literal label match */
 194         for (i = 0; i < page_cache->n_pages; i ++) {
 195                 if (page_cache->page_labels[i] != NULL &&
 196                     ! strcmp (page_label, page_cache->page_labels[i])) {
 197                         ev_page_cache_set_current_page (page_cache, i);
 198                         return TRUE;
 199                 }
 200         }
 201
 202         /* Next, parse the label, and see if the number fits */
 203         value = strtol (page_label, &endptr, 10);
 204         if (endptr[0] == '\0') {
 205                 /* Page number is an integer */
 206                 page = MIN (G_MAXINT, value);
 207
 208                 /* convert from a page label to a page offset */
 209                 page --;
 210                 if (page >= 0 &&
 211                     page < page_cache->n_pages &&
 212                     page_cache->page_labels[page] == NULL) {
 213                         ev_page_cache_set_current_page (page_cache, page);
 214                         return TRUE;
 215                 }
 216         }
 217
 218         return FALSE;
 219 }
 220
 221 void
 222 ev_page_cache_set_link (EvPageCache *page_cache,
 223                         EvLink      *link)
 224 {
 225         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 226         g_return_if_fail (EV_IS_LINK (link));
 227
 228         ev_page_cache_set_current_page (page_cache, ev_link_get_page (link));
 229 }
 230
 231 char *
 232 ev_page_cache_get_title (EvPageCache *page_cache)
 233 {
 234         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 235
 236         return page_cache->title;
 237 }
 238
 239 void
 240 ev_page_cache_get_size (EvPageCache *page_cache,
 241                         gint         page,
 242                         gfloat       scale,
 243                         gint        *width,
 244                         gint        *height)
 245 {
 246         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 247         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 248
 249         if (page_cache->uniform) {
 250                 if (width)
 251                         *width = page_cache->uniform_width;
 252                 if (height)
 253                         *height = page_cache->uniform_height;
 254         } else {
 255                 EvPageCacheInfo *info;
 256
 257                 info = &(page_cache->size_cache [page]);
 258
 259                 if (width)
 260                         *width = info->width;
 261                 if (height)
 262                         *height = info->height;
 263         }
 264
 265         if (width)
 266                 *width = (*width) * scale;
 267         if (width)
 268                 *height = (*height) * scale;
 269
 270 }
 271 gchar *
 272 ev_page_cache_get_page_label (EvPageCache *page_cache,
 273                               gint         page)
 274 {
 275         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 276         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 277
 278         if (page_cache->page_labels[page] == NULL)
 279                 return g_strdup_printf ("%d", page + 1);
 280
 281         return g_strdup (page_cache->page_labels[page]);
 282 }
 283
 284
 285 gboolean
 286 ev_page_cache_next_page (EvPageCache *page_cache)
 287 {
 288         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 289
 290         if (page_cache->current_page >= page_cache->n_pages - 1)
 291                 return FALSE;
 292
 293         ev_page_cache_set_current_page (page_cache, page_cache->current_page + 1);
 294         return TRUE;
 295
 296 }
 297
 298 gboolean
 299 ev_page_cache_prev_page (EvPageCache *page_cache)
 300 {
 301         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 302
 303         if (page_cache->current_page <= 0)
 304                 return FALSE;
 305
 306         ev_page_cache_set_current_page (page_cache, page_cache->current_page - 1);
 307         return TRUE;
 308 }
 309