gtkfilefilter.c 11.2 KB
Newer Older
Owen Taylor's avatar
Owen Taylor committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
/* GTK - The GIMP Toolkit
 * gtkfilefilter.c: Filters for selecting a file subset
 * Copyright (C) 2003, Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

21
#include <config.h>
Owen Taylor's avatar
Owen Taylor committed
22 23
#include <string.h>

24 25
#include "gtkfilefilter.h"
#include "gtkobject.h"
26
#include "gtkintl.h"
27
#include "gtkprivate.h"
28

29 30
#include "gtkalias.h"

31
#ifdef G_OS_UNIX
32 33
#define XDG_PREFIX _gtk_xdg
#include "xdgmime/xdgmime.h"
34
#endif
35

Owen Taylor's avatar
Owen Taylor committed
36 37 38 39 40 41 42 43 44 45
typedef struct _GtkFileFilterClass GtkFileFilterClass;
typedef struct _FilterRule FilterRule;

#define GTK_FILE_FILTER_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_FILE_FILTER, GtkFileFilterClass))
#define GTK_IS_FILE_FILTER_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_FILE_FILTER))
#define GTK_FILE_FILTER_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_FILE_FILTER, GtkFileFilterClass))

typedef enum {
  FILTER_RULE_PATTERN,
  FILTER_RULE_MIME_TYPE,
46
  FILTER_RULE_PIXBUF_FORMATS,
47
  FILTER_RULE_CUSTOM
Owen Taylor's avatar
Owen Taylor committed
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
} FilterRuleType;

struct _GtkFileFilterClass
{
  GtkObjectClass parent_class;
};

struct _GtkFileFilter
{
  GtkObject parent_instance;
  
  gchar *name;
  GSList *rules;

  GtkFileFilterFlags needed;
};

struct _FilterRule
{
  FilterRuleType type;
  GtkFileFilterFlags needed;
  
  union {
    gchar *pattern;
    gchar *mime_type;
73
    GSList *pixbuf_formats;
Owen Taylor's avatar
Owen Taylor committed
74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106
    struct {
      GtkFileFilterFunc func;
      gpointer data;
      GDestroyNotify notify;
    } custom;
  } u;
};

static void gtk_file_filter_class_init (GtkFileFilterClass *class);
static void gtk_file_filter_finalize   (GObject            *object);

static GObjectClass *parent_class;

GType
gtk_file_filter_get_type (void)
{
  static GType file_filter_type = 0;

  if (!file_filter_type)
    {
      static const GTypeInfo file_filter_info =
      {
	sizeof (GtkFileFilterClass),
	NULL,		/* base_init */
	NULL,		/* base_finalize */
	(GClassInitFunc) gtk_file_filter_class_init,
	NULL,		/* class_finalize */
	NULL,		/* class_data */
	sizeof (GtkFileFilter),
	0,		/* n_preallocs */
	NULL            /* init */
      };
      
107
      file_filter_type = g_type_register_static (GTK_TYPE_OBJECT, I_("GtkFileFilter"),
Owen Taylor's avatar
Owen Taylor committed
108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
						 &file_filter_info, 0);
    }

  return file_filter_type;
}

static void
gtk_file_filter_class_init (GtkFileFilterClass *class)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (class);

  parent_class = g_type_class_peek_parent (class);

  gobject_class->finalize = gtk_file_filter_finalize;
}

static void
filter_rule_free (FilterRule *rule)
{
  switch (rule->type)
    {
    case FILTER_RULE_MIME_TYPE:
      g_free (rule->u.mime_type);
      break;
    case FILTER_RULE_PATTERN:
      g_free (rule->u.pattern);
      break;
    case FILTER_RULE_CUSTOM:
      if (rule->u.custom.notify)
	rule->u.custom.notify (rule->u.custom.data);
      break;
139 140 141
    case FILTER_RULE_PIXBUF_FORMATS:
      g_slist_free (rule->u.pixbuf_formats);
      break;
142 143
    default:
      g_assert_not_reached ();
Owen Taylor's avatar
Owen Taylor committed
144 145 146 147 148 149 150 151
    }

  g_free (rule);
}

static void
gtk_file_filter_finalize (GObject  *object)
{
152
  GtkFileFilter *filter = GTK_FILE_FILTER (object);
Owen Taylor's avatar
Owen Taylor committed
153 154

  g_slist_foreach (filter->rules, (GFunc)filter_rule_free, NULL);
155 156 157 158
  g_slist_free (filter->rules);

  if (filter->name)
    g_free (filter->name);
Owen Taylor's avatar
Owen Taylor committed
159 160 161 162 163 164 165 166 167 168 169 170 171 172 173

  parent_class->finalize (object);
}

/**
 * gtk_file_filter_new:
 * 
 * Creates a new #GtkFileFilter with no rules added to it.
 * Such a filter doesn't accept any files, so is not
 * particularly useful until you add rules with
 * gtk_file_filter_add_mime_type(), gtk_file_filter_add_pattern(),
 * or gtk_file_filter_add_custom(). To create a filter
 * that accepts any file, use:
 *
 * <informalexample><programlisting>
174
 * GtkFileFilter *filter = gtk_file_filter_new (<!-- -->);
Owen Taylor's avatar
Owen Taylor committed
175
 * gtk_file_filter_add_pattern (filter, "*");
176
 * </programlisting></informalexample>
Owen Taylor's avatar
Owen Taylor committed
177 178
 * 
 * Return value: a new #GtkFileFilter
179 180
 * 
 * Since: 2.4
Owen Taylor's avatar
Owen Taylor committed
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196
 **/
GtkFileFilter *
gtk_file_filter_new (void)
{
  return g_object_new (GTK_TYPE_FILE_FILTER, NULL);
}

/**
 * gtk_file_filter_set_name:
 * @filter: a #GtkFileFilter
 * @name: the human-readable-name for the filter, or %NULL
 *   to remove any existing name.
 * 
 * Sets the human-readable name of the filter; this is the string
 * that will be displayed in the file selector user interface if
 * there is a selectable list of filters.
197 198
 * 
 * Since: 2.4
Owen Taylor's avatar
Owen Taylor committed
199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220
 **/
void
gtk_file_filter_set_name (GtkFileFilter *filter,
			  const gchar   *name)
{
  g_return_if_fail (GTK_IS_FILE_FILTER (filter));
  
  if (filter->name)
    g_free (filter->name);

  filter->name = g_strdup (name);
}

/**
 * gtk_file_filter_get_name:
 * @filter: a #GtkFileFilter
 * 
 * Gets the human-readable name for the filter. See gtk_file_filter_set_name().
 * 
 * Return value: The human-readable name of the filter,
 *   or %NULL. This value is owned by GTK+ and must not
 *   be modified or freed.
221 222
 * 
 * Since: 2.4
Owen Taylor's avatar
Owen Taylor committed
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245
 **/
G_CONST_RETURN gchar *
gtk_file_filter_get_name (GtkFileFilter *filter)
{
  g_return_val_if_fail (GTK_IS_FILE_FILTER (filter), NULL);
  
  return filter->name;
}

static void
file_filter_add_rule (GtkFileFilter *filter,
		      FilterRule    *rule)
{
  filter->needed |= rule->needed;
  filter->rules = g_slist_append (filter->rules, rule);
}

/**
 * gtk_file_filter_add_mime_type:
 * @filter: A #GtkFileFilter
 * @mime_type: name of a MIME type
 * 
 * Adds a rule allowing a given mime type to @filter.
246 247
 * 
 * Since: 2.4
Owen Taylor's avatar
Owen Taylor committed
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
 **/
void
gtk_file_filter_add_mime_type (GtkFileFilter *filter,
			       const gchar   *mime_type)
{
  FilterRule *rule;
  
  g_return_if_fail (GTK_IS_FILE_FILTER (filter));
  g_return_if_fail (mime_type != NULL);

  rule = g_new (FilterRule, 1);
  rule->type = FILTER_RULE_MIME_TYPE;
  rule->needed = GTK_FILE_FILTER_MIME_TYPE;
  rule->u.mime_type = g_strdup (mime_type);

  file_filter_add_rule (filter, rule);
}

/**
 * gtk_file_filter_add_pattern:
 * @filter: a #GtkFileFilter
 * @pattern: a shell style glob
 * 
 * Adds a rule allowing a shell style glob to a filter.
272 273
 * 
 * Since: 2.4
Owen Taylor's avatar
Owen Taylor committed
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291
 **/
void
gtk_file_filter_add_pattern (GtkFileFilter *filter,
			     const gchar   *pattern)
{
  FilterRule *rule;
  
  g_return_if_fail (GTK_IS_FILE_FILTER (filter));
  g_return_if_fail (pattern != NULL);

  rule = g_new (FilterRule, 1);
  rule->type = FILTER_RULE_PATTERN;
  rule->needed = GTK_FILE_FILTER_DISPLAY_NAME;
  rule->u.pattern = g_strdup (pattern);

  file_filter_add_rule (filter, rule);
}

292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
/**
 * gtk_file_filter_add_pixbuf_formats:
 * @filter: a #GtkFileFilter
 * 
 * Adds a rule allowing image files in the formats supported
 * by GdkPixbuf.
 * 
 * Since: 2.6
 **/
void
gtk_file_filter_add_pixbuf_formats (GtkFileFilter *filter)
{
  FilterRule *rule;
  
  g_return_if_fail (GTK_IS_FILE_FILTER (filter));

  rule = g_new (FilterRule, 1);
  rule->type = FILTER_RULE_PIXBUF_FORMATS;
  rule->needed = GTK_FILE_FILTER_MIME_TYPE;
  rule->u.pixbuf_formats = gdk_pixbuf_get_formats ();
  file_filter_add_rule (filter, rule);
}


Owen Taylor's avatar
Owen Taylor committed
316 317 318 319 320 321 322 323 324 325 326 327 328 329 330
/**
 * gtk_file_filter_add_custom:
 * @filter: a #GtkFileFilter
 * @needed: bitfield of flags indicating the information that the custom
 *          filter function needs.
 * @func: callback function; if the function returns %TRUE, then
 *   the file will be displayed.
 * @data: data to pass to @func
 * @notify: function to call to free @data when it is no longer needed.
 * 
 * Adds rule to a filter that allows files based on a custom callback
 * function. The bitfield @needed which is passed in provides information
 * about what sorts of information that the filter function needs;
 * this allows GTK+ to avoid retrieving expensive information when
 * it isn't needed by the filter.
331 332
 * 
 * Since: 2.4
Owen Taylor's avatar
Owen Taylor committed
333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368
 **/
void
gtk_file_filter_add_custom (GtkFileFilter         *filter,
			    GtkFileFilterFlags     needed,
			    GtkFileFilterFunc      func,
			    gpointer               data,
			    GDestroyNotify         notify)
{
  FilterRule *rule;
  
  g_return_if_fail (GTK_IS_FILE_FILTER (filter));
  g_return_if_fail (func != NULL);

  rule = g_new (FilterRule, 1);
  rule->type = FILTER_RULE_CUSTOM;
  rule->needed = needed;
  rule->u.custom.func = func;
  rule->u.custom.data = data;
  rule->u.custom.notify = notify;

  file_filter_add_rule (filter, rule);
}

/**
 * gtk_file_filter_get_needed:
 * @filter: a #GtkFileFilter
 * 
 * Gets the fields that need to be filled in for the structure
 * passed to gtk_file_filter_filter()
 * 
 * This function will not typically be used by applications; it
 * is intended principally for use in the implementation of
 * #GtkFileChooser.
 * 
 * Return value: bitfield of flags indicating needed fields when
 *   calling gtk_file_filter_filter()
369 370
 * 
 * Since: 2.4
Owen Taylor's avatar
Owen Taylor committed
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385
 **/
GtkFileFilterFlags
gtk_file_filter_get_needed (GtkFileFilter *filter)
{
  return filter->needed;
}

/**
 * gtk_file_filter_filter:
 * @filter: a #GtkFileFilter
 * @filter_info: a #GtkFileFilterInfo structure containing information
 *  about a file.
 * 
 * Tests whether a file should be displayed according to @filter.
 * The #GtkFileFilterInfo structure @filter_info should include
Matthias Clasen's avatar
Matthias Clasen committed
386
 * the fields returned from gtk_file_filter_get_needed().
Owen Taylor's avatar
Owen Taylor committed
387 388 389 390 391 392
 *
 * This function will not typically be used by applications; it
 * is intended principally for use in the implementation of
 * #GtkFileChooser.
 * 
 * Return value: %TRUE if the file should be displayed
393 394
 * 
 * Since: 2.4
Owen Taylor's avatar
Owen Taylor committed
395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411
 **/
gboolean
gtk_file_filter_filter (GtkFileFilter           *filter,
			const GtkFileFilterInfo *filter_info)
{
  GSList *tmp_list;

  for (tmp_list = filter->rules; tmp_list; tmp_list = tmp_list->next)
    {
      FilterRule *rule = tmp_list->data;

      if ((filter_info->contains & rule->needed) != rule->needed)
	continue;
      
      switch (rule->type)
	{
	case FILTER_RULE_MIME_TYPE:
412
	  if (filter_info->mime_type != NULL
413
#ifdef G_OS_UNIX
414
	      && xdg_mime_mime_type_subclass (filter_info->mime_type, rule->u.mime_type))
415 416 417
#else
	      && strcmp (rule->u.mime_type, filter_info->mime_type) == 0)
#endif
Owen Taylor's avatar
Owen Taylor committed
418 419 420
	    return TRUE;
	  break;
	case FILTER_RULE_PATTERN:
421
	  if (filter_info->display_name != NULL &&
Federico Mena Quintero's avatar
Federico Mena Quintero committed
422
	      _gtk_fnmatch (rule->u.pattern, filter_info->display_name, FALSE))
Owen Taylor's avatar
Owen Taylor committed
423 424
	    return TRUE;
	  break;
425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
	case FILTER_RULE_PIXBUF_FORMATS:
	  {
	    GSList *list;

	    for (list = rule->u.pixbuf_formats; list; list = list->next)
	      {
		int i;
		gchar **mime_types;

		mime_types = gdk_pixbuf_format_get_mime_types (list->data);

		for (i = 0; mime_types[i] != NULL; i++)
		  {
		    if (strcmp (mime_types[i], filter_info->mime_type) == 0)
		      {
			g_strfreev (mime_types);
			return TRUE;
		      }
		  }

		g_strfreev (mime_types);
	      }
	    break;
	  }
Owen Taylor's avatar
Owen Taylor committed
449 450 451 452 453 454 455 456 457
	case FILTER_RULE_CUSTOM:
	  if (rule->u.custom.func (filter_info, rule->u.custom.data))
	    return TRUE;
	  break;
	}
    }

  return FALSE;
}
458 459 460

#define __GTK_FILE_FILTER_C__
#include "gtkaliasdef.c"