mcs/class/Managed.Windows.Forms/System.Windows.Forms/MimeIcon.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2006 Alexander Olk
  21 //
  22 // Authors:
  23 //
  24 //  Alexander Olk       alex.olk@googlemail.com
  25 //
  26
  27 // use
  28 // public static int GetIconIndexForFile( string full_filename )
  29 // public static int GetIconIndexForMimeType( string mime_type )
  30 // to get the image index in MimeIconEngine.SmallIcons and MimeIconEngine.LargeIcons
  31
  32 using System;
  33 using System.Reflection;
  34 using System.Drawing;
  35 using System.Collections;
  36 using System.IO;
  37 using System.Text;
  38 using System.Runtime.InteropServices;
  39 using System.Xml;
  40
  41 namespace System.Windows.Forms
  42 {
  43         internal enum MimeExtensionHandlerStatus
  44         {
  45                 OK,
  46                 ERROR
  47         }
  48
  49         internal enum EPlatformHandler
  50         {
  51                 Default,
  52                 GNOME
  53         }
  54
  55         internal class ResourceImageLoader
  56         {
  57                 static Assembly assembly = typeof (ResourceImageLoader).Assembly;
  58
  59                 static internal Bitmap Get (string name)
  60                 {
  61                         Stream stream = assembly.GetManifestResourceStream (name);
  62
  63                         if (stream == null) {
  64                                 Console.WriteLine ("Failed to read {0}", name);
  65                                 return null;
  66                         }
  67
  68                         return new Bitmap (stream);
  69                 }
  70         }
  71
  72         internal class MimeIconEngine
  73         {
  74                 public static ImageList SmallIcons = new ImageList();
  75                 public static ImageList LargeIcons = new ImageList();
  76
  77                 private static EPlatformHandler platform = EPlatformHandler.Default;
  78
  79                 internal static Hashtable MimeIconIndex = new Hashtable ();
  80
  81                 private static PlatformMimeIconHandler platformMimeHandler = null;
  82
  83                 private static object lock_object = new Object();
  84
  85                 static MimeIconEngine ()
  86                 {
  87                         SmallIcons.ColorDepth = ColorDepth.Depth32Bit;
  88                         SmallIcons.TransparentColor = Color.Transparent;
  89                         LargeIcons.ColorDepth = ColorDepth.Depth32Bit;
  90                         LargeIcons.TransparentColor = Color.Transparent;
  91
  92                         string session =  Environment.GetEnvironmentVariable ("DESKTOP_SESSION");
  93
  94                         if (session != null) {
  95                                 session = session.ToUpper ();
  96
  97                                 if (session == "DEFAULT") {
  98                                         string helper = Environment.GetEnvironmentVariable ("GNOME_DESKTOP_SESSION_ID");
  99
 100                                         if (helper != null)
 101                                                 session = "GNOME";
 102                                 }
 103                         } else
 104                                 session = String.Empty;
 105
 106                         if (Mime.MimeAvailable && session == "GNOME") {
 107                                 SmallIcons.ImageSize = new Size (24, 24);
 108                                 LargeIcons.ImageSize = new Size (48, 48);
 109
 110                                 platformMimeHandler = new GnomeHandler ();
 111                                 if (platformMimeHandler.Start () == MimeExtensionHandlerStatus.OK) {
 112                                         platform = EPlatformHandler.GNOME;
 113                                 } else {
 114                                         MimeIconEngine.LargeIcons.Images.Clear ();
 115                                         MimeIconEngine.SmallIcons.Images.Clear ();
 116                                         platformMimeHandler = new PlatformDefaultHandler ();
 117                                         platformMimeHandler.Start ();
 118                                 }
 119                         } else {
 120                                 SmallIcons.ImageSize = new Size (16, 16);
 121                                 LargeIcons.ImageSize = new Size (48, 48);
 122
 123                                 platformMimeHandler = new PlatformDefaultHandler ();
 124                                 platformMimeHandler.Start ();
 125                         }
 126                 }
 127
 128                 public static int GetIconIndexForFile (string full_filename)
 129                 {
 130                         lock (lock_object) {
 131                                 if (platform == EPlatformHandler.Default) {
 132                                         return (int)MimeIconIndex ["unknown/unknown"];
 133                                 }
 134
 135                                 string mime_type = Mime.GetMimeTypeForFile (full_filename);
 136
 137                                 object oindex = GetIconIndex (mime_type);
 138
 139                                 // not found, add it
 140                                 if (oindex == null) {
 141                                         int index = full_filename.IndexOf (':');
 142
 143                                         if (index > 1) {
 144                                                 oindex = MimeIconIndex ["unknown/unknown"];
 145
 146                                         } else {
 147                                                 oindex = platformMimeHandler.AddAndGetIconIndex (full_filename, mime_type);
 148
 149                                                 // sanity check
 150                                                 if (oindex == null)
 151                                                         oindex = MimeIconIndex ["unknown/unknown"];
 152                                         }
 153                                 }
 154
 155                                 return (int)oindex;
 156                         }
 157                 }
 158
 159                 public static int GetIconIndexForMimeType (string mime_type)
 160                 {
 161                         lock (lock_object) {
 162                                 if (platform == EPlatformHandler.Default) {
 163                                         if (mime_type == "inode/directory") {
 164                                                 return (int)MimeIconIndex ["inode/directory"];
 165                                         } else {
 166                                                 return (int)MimeIconIndex ["unknown/unknown"];
 167                                         }
 168                                 }
 169
 170                                 object oindex = GetIconIndex (mime_type);
 171
 172                                 // not found, add it
 173                                 if (oindex == null) {
 174                                         oindex = platformMimeHandler.AddAndGetIconIndex (mime_type);
 175
 176                                         // sanity check
 177                                         if (oindex == null)
 178                                                 oindex = MimeIconIndex ["unknown/unknown"];
 179                                 }
 180
 181                                 return (int)oindex;
 182                         }
 183                 }
 184
 185                 public static Image GetIconForMimeTypeAndSize (string mime_type, Size size)
 186                 {
 187                         lock (lock_object) {
 188                                 object oindex = GetIconIndex (mime_type);
 189
 190                                 Bitmap bmp = new Bitmap (LargeIcons.Images [(int)oindex], size);
 191
 192                                 return bmp;
 193                         }
 194                 }
 195
 196                 internal static void AddIconByImage (string mime_type, Image image)
 197                 {
 198                         int index = SmallIcons.Images.Add (image, Color.Transparent);
 199                         LargeIcons.Images.Add (image, Color.Transparent);
 200
 201                         MimeIconIndex.Add (mime_type, index);
 202                 }
 203
 204                 private static object GetIconIndex (string mime_type)
 205                 {
 206                         object oindex = null;
 207
 208                         if (mime_type != null) {
 209                                 // first check if mime_type is available in the mimetype/icon hashtable
 210                                 oindex = MimeIconIndex [mime_type];
 211
 212                                 if (oindex == null) {
 213                                         // it is not available, check if an alias exist for mime_type
 214                                         string alias = Mime.GetMimeAlias (mime_type);
 215
 216                                         if (alias != null) {
 217                                                 string[] split = alias.Split (new char [] { ',' });
 218
 219                                                 for (int i = 0; i < split.Length; i++) {
 220                                                         oindex = MimeIconIndex [split [i]];
 221
 222                                                         if (oindex != null)
 223                                                                 return oindex;
 224                                                 }
 225                                         }
 226
 227                                         // if oindex is still null check if mime_type is a sub class of an other mime type
 228                                         string sub_class = Mime.SubClasses [mime_type];
 229
 230                                         if (sub_class != null) {
 231                                                 oindex = MimeIconIndex [sub_class];
 232
 233                                                 if (oindex != null)
 234                                                         return oindex;
 235                                         }
 236
 237                                         // last check, see if we find an entry for the main mime type class
 238                                         string mime_class_main = mime_type.Substring (0, mime_type.IndexOf ('/'));
 239                                         return MimeIconIndex [mime_class_main];
 240                                 }
 241                         }
 242
 243                         return oindex;
 244                 }
 245         }
 246
 247         internal abstract class PlatformMimeIconHandler
 248         {
 249                 protected MimeExtensionHandlerStatus mimeExtensionHandlerStatus = MimeExtensionHandlerStatus.OK;
 250
 251                 public MimeExtensionHandlerStatus MimeExtensionHandlerStatus {
 252                         get {
 253                                 return mimeExtensionHandlerStatus;
 254                         }
 255                 }
 256
 257                 public abstract MimeExtensionHandlerStatus Start ();
 258
 259                 public virtual object AddAndGetIconIndex (string filename, string mime_type)
 260                 {
 261                         return null;
 262                 }
 263
 264                 public virtual object AddAndGetIconIndex (string mime_type)
 265                 {
 266                         return null;
 267                 }
 268         }
 269
 270         internal class PlatformDefaultHandler : PlatformMimeIconHandler
 271         {
 272                 public override MimeExtensionHandlerStatus Start ()
 273                 {
 274                         MimeIconEngine.AddIconByImage ("inode/directory",  ResourceImageLoader.Get ("folder.png"));
 275                         MimeIconEngine.AddIconByImage ("unknown/unknown",  ResourceImageLoader.Get ("text-x-generic.png"));
 276                         MimeIconEngine.AddIconByImage ("desktop/desktop",  ResourceImageLoader.Get ("user-desktop.png"));
 277                         MimeIconEngine.AddIconByImage ("directory/home",  ResourceImageLoader.Get ("user-home.png"));
 278
 279                         MimeIconEngine.AddIconByImage ("network/network",  ResourceImageLoader.Get ("folder-remote.png"));
 280                         MimeIconEngine.AddIconByImage ("recently/recently",  ResourceImageLoader.Get ("document-open.png"));
 281                         MimeIconEngine.AddIconByImage ("workplace/workplace",  ResourceImageLoader.Get ("computer.png"));
 282
 283                         return MimeExtensionHandlerStatus.OK; // return always ok
 284                 }
 285         }
 286
 287         internal class GnomeHandler : PlatformMimeIconHandler
 288         {
 289                 public override MimeExtensionHandlerStatus Start ()
 290                 {
 291                         CreateUIIcons ();
 292
 293                         return MimeExtensionHandlerStatus.OK;
 294                 }
 295
 296                 private void CreateUIIcons ()
 297                 {
 298                         AddGnomeIcon ("unknown/unknown", "gnome-fs-regular");
 299                         AddGnomeIcon ("inode/directory", "gnome-fs-directory");
 300                         AddGnomeIcon ("directory/home", "gnome-fs-home");
 301                         AddGnomeIcon ("desktop/desktop", "gnome-fs-desktop");
 302                         AddGnomeIcon ("recently/recently", "gnome-fs-directory-accept");
 303                         AddGnomeIcon ("workplace/workplace", "gnome-fs-client");
 304
 305                         AddGnomeIcon ("network/network", "gnome-fs-network");
 306                         AddGnomeIcon ("nfs/nfs", "gnome-fs-nfs");
 307                         AddGnomeIcon ("smb/smb", "gnome-fs-smb");
 308
 309                         AddGnomeIcon ("harddisk/harddisk", "gnome-dev-harddisk");
 310                         AddGnomeIcon ("cdrom/cdrom", "gnome-dev-cdrom");
 311                         AddGnomeIcon ("removable/removable", "gnome-dev-removable");
 312                 }
 313
 314                 private void AddGnomeIcon (string internal_mime_type, string name)
 315                 {
 316                         int index = -1;
 317
 318                         if (MimeIconEngine.MimeIconIndex.ContainsKey (internal_mime_type)) {
 319                                 return;
 320                         }
 321
 322                         Image image = GnomeUtil.GetIcon (name, 48);
 323
 324                         if (image == null) {
 325                                 if (internal_mime_type == "unknown/unknown")
 326                                         image = ResourceImageLoader.Get ("text-x-generic.png");
 327                                 else
 328                                 if (internal_mime_type == "inode/directory")
 329                                         image = ResourceImageLoader.Get ("folder.png");
 330                                 else
 331                                 if (internal_mime_type == "directory/home")
 332                                         image = ResourceImageLoader.Get ("user-home.png");
 333                                 else
 334                                 if (internal_mime_type == "desktop/desktop")
 335                                         image = ResourceImageLoader.Get ("user-desktop.png");
 336                                 else
 337                                 if (internal_mime_type == "recently/recently")
 338                                         image = ResourceImageLoader.Get ("document-open.png");
 339                                 else
 340                                 if (internal_mime_type == "workplace/workplace")
 341                                         image = ResourceImageLoader.Get ("computer.png");
 342                                 else
 343                                 if (internal_mime_type == "network/network" || internal_mime_type == "nfs/nfs" || internal_mime_type == "smb/smb")
 344                                         image = ResourceImageLoader.Get ("folder-remote.png");
 345                                 else
 346                                 if (internal_mime_type == "harddisk/harddisk" || internal_mime_type == "cdrom/cdrom" || internal_mime_type == "removable/removable")
 347                                         image = ResourceImageLoader.Get ("text-x-generic.png");
 348                         }
 349
 350                         index = MimeIconEngine.SmallIcons.Images.Add (image, Color.Transparent);
 351                         MimeIconEngine.LargeIcons.Images.Add (image, Color.Transparent);
 352
 353                         MimeIconEngine.MimeIconIndex.Add (internal_mime_type, index);
 354                 }
 355
 356                 public override object AddAndGetIconIndex (string filename, string mime_type)
 357                 {
 358                         int index = -1;
 359
 360                         Image image = GnomeUtil.GetIcon (filename, mime_type, 48);
 361
 362                         index = MimeIconEngine.SmallIcons.Images.Add (image, Color.Transparent);
 363                         MimeIconEngine.LargeIcons.Images.Add (image, Color.Transparent);
 364
 365                         MimeIconEngine.MimeIconIndex.Add (mime_type, index);
 366
 367                         return index;
 368                 }
 369
 370                 public override object AddAndGetIconIndex (string mime_type)
 371                 {
 372                         int index = -1;
 373
 374                         Image image = GnomeUtil.GetIcon (mime_type, 48);
 375
 376                         index = MimeIconEngine.SmallIcons.Images.Add (image, Color.Transparent);
 377                         MimeIconEngine.LargeIcons.Images.Add (image, Color.Transparent);
 378
 379                         MimeIconEngine.MimeIconIndex.Add (mime_type, index);
 380
 381                         return index;
 382                 }
 383         }
 384
 385         internal class GnomeUtil
 386         {
 387                 const string libgdk = "libgdk-x11-2.0.so.0";
 388                 const string libgdk_pixbuf = "libgdk_pixbuf-2.0.so.0";
 389                 const string libgtk = "libgtk-x11-2.0.so.0";
 390                 const string libglib = "libglib-2.0.so.0";
 391                 const string libgobject = "libgobject-2.0.so.0";
 392                 const string libgnomeui = "libgnomeui-2.so.0";
 393                 const string librsvg = "librsvg-2.so.2";
 394
 395                 [DllImport(librsvg)]
 396                 static extern IntPtr rsvg_pixbuf_from_file_at_size (string file_name, int  width, int  height, out IntPtr error);
 397
 398                 [DllImport(libgdk_pixbuf)]
 399                 static extern bool gdk_pixbuf_save_to_buffer (IntPtr pixbuf, out IntPtr buffer, out UIntPtr buffer_size, string type, out IntPtr error, IntPtr option_dummy);
 400
 401                 [DllImport(libglib)]
 402                 static extern void g_free (IntPtr mem);
 403
 404                 [DllImport(libgdk)]
 405                 static extern bool gdk_init_check (IntPtr argc, IntPtr argv);
 406
 407                 [DllImport(libgobject)]
 408                 static extern void g_object_unref (IntPtr nativeObject);
 409
 410                 [DllImport(libgnomeui)]
 411                 static extern string gnome_icon_lookup (IntPtr icon_theme, IntPtr thumbnail_factory, string file_uri, string custom_icon, IntPtr file_info, string mime_type, GnomeIconLookupFlags flags, IntPtr result);
 412
 413                 [DllImport(libgtk)]
 414                 static extern IntPtr gtk_icon_theme_get_default ();
 415
 416                 [DllImport(libgtk)]
 417                 static extern IntPtr gtk_icon_theme_load_icon (IntPtr icon_theme, string icon_name, int size, GtkIconLookupFlags flags, out IntPtr error);
 418
 419                 [DllImport(libgtk)]
 420                 static extern bool gtk_icon_theme_has_icon (IntPtr icon_theme, string icon_name);
 421
 422                 enum GnomeIconLookupFlags
 423                 {
 424                         GNOME_ICON_LOOKUP_FLAGS_NONE = 0,
 425                         GNOME_ICON_LOOKUP_FLAGS_EMBEDDING_TEXT = 1<<0,
 426                         GNOME_ICON_LOOKUP_FLAGS_SHOW_SMALL_IMAGES_AS_THEMSELVES = 1<<1,
 427                         GNOME_ICON_LOOKUP_FLAGS_ALLOW_SVG_AS_THEMSELVES = 1<<2
 428                 };
 429
 430                 enum GtkIconLookupFlags
 431                 {
 432                         GTK_ICON_LOOKUP_NO_SVG = 1 << 0,
 433                         GTK_ICON_LOOKUP_FORCE_SVG = 1 << 1,
 434                         GTK_ICON_LOOKUP_USE_BUILTIN = 1 << 2
 435                 };
 436
 437                 static bool inited = false;
 438
 439                 static IntPtr default_icon_theme = IntPtr.Zero;
 440
 441                 static void Init ()
 442                 {
 443                         gdk_init_check (IntPtr.Zero, IntPtr.Zero);
 444
 445                         inited = true;
 446
 447                         default_icon_theme = gtk_icon_theme_get_default ();
 448                 }
 449
 450                 public static Image GetIcon (string file_name, string mime_type, int size)
 451                 {
 452                         if (!inited)
 453                                 Init ();
 454
 455                         Uri uri = new Uri (file_name);
 456
 457                         string icon = gnome_icon_lookup (default_icon_theme, IntPtr.Zero, uri.AbsoluteUri,
 458                                                          null, IntPtr.Zero, mime_type,
 459                                                          GnomeIconLookupFlags.GNOME_ICON_LOOKUP_FLAGS_NONE, IntPtr.Zero);
 460
 461                         IntPtr error = IntPtr.Zero;
 462                         IntPtr pixbuf = gtk_icon_theme_load_icon (default_icon_theme, icon, size,
 463                                                                   GtkIconLookupFlags.GTK_ICON_LOOKUP_USE_BUILTIN, out error);
 464
 465                         if (error != IntPtr.Zero)
 466                                 return null;
 467
 468                         return GdkPixbufToImage (pixbuf);
 469                 }
 470
 471                 public static Image GetIcon (string icon, int size)
 472                 {
 473                         if (!inited)
 474                                 Init ();
 475
 476                         IntPtr error = IntPtr.Zero;
 477                         IntPtr pixbuf = gtk_icon_theme_load_icon (default_icon_theme, icon, size,
 478                                                                   GtkIconLookupFlags.GTK_ICON_LOOKUP_USE_BUILTIN, out error);
 479
 480                         if (error != IntPtr.Zero)
 481                                 return null;
 482
 483                         return GdkPixbufToImage (pixbuf);
 484                 }
 485
 486                 public static Image GdkPixbufToImage (IntPtr pixbuf)
 487                 {
 488                         IntPtr error = IntPtr.Zero;
 489                         IntPtr buffer;
 490                         UIntPtr buffer_size_as_ptr;
 491                         string type = "png";
 492
 493                         bool saved = gdk_pixbuf_save_to_buffer (pixbuf, out buffer, out buffer_size_as_ptr, type, out error, IntPtr.Zero);
 494
 495                         if (!saved)
 496                                 return null;
 497
 498                         int buffer_size = (int) (uint) buffer_size_as_ptr;
 499                         byte[] result = new byte [buffer_size];
 500                         Marshal.Copy (buffer, result, 0, (int) buffer_size);
 501                         g_free (buffer);
 502                         g_object_unref (pixbuf);
 503
 504                         Image image = null;
 505                         MemoryStream s = new MemoryStream (result);
 506                         image = Image.FromStream (s);
 507
 508                         return image;
 509                 }
 510
 511                 public static Image GetSVGasImage (string filename, int width, int height)
 512                 {
 513                         if (!inited)
 514                                 Init ();
 515
 516                         if (!File.Exists (filename))
 517                                 return null;
 518                         IntPtr error = IntPtr.Zero;
 519                         IntPtr pixbuf = rsvg_pixbuf_from_file_at_size (filename, width, height, out error);
 520
 521                         if (error != IntPtr.Zero)
 522                                 return null;
 523
 524                         return GdkPixbufToImage (pixbuf);
 525                 }
 526
 527                 public static bool HasImage (string name)
 528                 {
 529                         if (!inited)
 530                                 Init ();
 531
 532                         return gtk_icon_theme_has_icon (default_icon_theme, name);
 533                 }
 534         }
 535 }
 536