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using System.Reflection;
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using System.Collections.Generic;
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using System.Reflection;
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public static class IconProvider
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public static readonly Pixbuf UnknownPixbuf;
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public const int DefaultIconSize = 80;
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const int DefaultIconSize = 80;
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// Cache of loaded icons: key is "iconname_size".
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static Dictionary<string, Pixbuf> pixbufCache;
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static IconTheme [] themes;
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static IconProvider ()
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pixbufCache = new Dictionary<string, Pixbuf> ();
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UnknownPixbuf = new Pixbuf (Colorspace.Rgb, true, 8, 1, 1);
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UnknownPixbuf.Fill (0x00000000);
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themes = new IconTheme [2];
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themes [0] = IconTheme.Default;
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IconTheme.Default.Changed += OnDefaultIconThemeChanged;
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static bool IconIsEmbeddedResource (string name)
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return name.IndexOf ("@") > 0;
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static bool IconIsFile (string name)
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return name.StartsWith ("/") ||
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name.StartsWith ("~/") ||
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name.StartsWith ("file://",
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StringComparison.OrdinalIgnoreCase);
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static Pixbuf IconFromEmbeddedResource (string name, int size)
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string resource, assemblyName;
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resource = name.Substring (0, name.IndexOf ("@"));
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assemblyName = name.Substring (resource.Length + 1);
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foreach (Assembly asm in AppDomain.CurrentDomain.GetAssemblies ()) {
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if (asm.FullName != assemblyName) continue;
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pixbuf = new Pixbuf (asm, resource, size, size);
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} catch (Exception e) {
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Console.Error.WriteLine ("Failed to load icon resource {0} " +
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"from assembly {1}: {2}", resource, assemblyName, e.Message);
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static Pixbuf IconFromFile (string name, int size)
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name = name.Replace ("~", Paths.UserHome);
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pixbuf = new Pixbuf (name, size, size);
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static Pixbuf IconFromTheme (string name, int size, IconTheme theme)
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// We may have to remove the extension.
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if (name.Contains (".")) {
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name_noext = name.Remove (name.LastIndexOf ("."));
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if (theme.HasIcon (name)) {
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pixbuf = theme.LoadIcon (name, size, 0);
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} else if (theme.HasIcon (name_noext)) {
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pixbuf = theme.LoadIcon (name_noext, size, 0);
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} else if (name == "gnome-mime-text-plain" &&
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theme.HasIcon ("gnome-mime-text")) {
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pixbuf = theme.LoadIcon ("gnome-mime-text", size, 0);
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static Pixbuf GenericFileIcon (int size)
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Pixbuf pixbuf = null;
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if (IconTheme.Default.HasIcon ("gtk-file")) {
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pixbuf = IconTheme.Default.LoadIcon ("gtk-file", size, 0);
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static Pixbuf UnknownIcon (int size)
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Pixbuf pixbuf = null;
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if (IconTheme.Default.HasIcon ("emblem-noread")) {
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pixbuf = IconTheme.Default.LoadIcon ("emblem-noread", size, 0);
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public static Pixbuf PixbufFromIconName (string name, int size)
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string name_noext, iconKey, resourceName, resourceNamespace;
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if (string.IsNullOrEmpty (name)) return null;
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// Is the icon name in cache?
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iconKey = string.Format ("{0}_{1}", name, size);
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if (pixbufCache.TryGetValue (iconKey, out pixbuf)) {
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// TODO: Use a GNOME ThumbnailFactory
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// The icon can be loaded from a loaded assembly if the icon has
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// the format: "resource@assemblyname".
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if (name.IndexOf ("@") > 0) {
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resourceName = name.Substring (0, name.IndexOf ("@"));
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resourceNamespace = name.Substring (resourceName.Length +1);
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// loop though all loaded assemblies in the AppDomain
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foreach (Assembly asmb in AppDomain.CurrentDomain.GetAssemblies ()) {
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if (new AssemblyName (asmb.FullName).Name.Equals (resourceNamespace)) {
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pixbuf = new Pixbuf (asmb, resourceName, size, size);
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// TODO: Should we log this error?
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if (name.StartsWith ("/") ||
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name.StartsWith ("~/") ||
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name.StartsWith ("file://", StringComparison.OrdinalIgnoreCase)) {
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pixbuf = new Pixbuf (name, size, size);
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// Could not load from file.
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if (name.Contains (".")) {
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name_noext = name.Remove (name.LastIndexOf ("."));
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theme = IconTheme.Default;
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if (theme.HasIcon (name)) {
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pixbuf = theme.LoadIcon (name, size, 0);
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else if (theme.HasIcon (name_noext)) {
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pixbuf = theme.LoadIcon (name_noext, size, 0);
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else if (name == "gnome-mime-text-plain" &&
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theme.HasIcon ("gnome-mime-text")) {
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pixbuf = theme.LoadIcon ("gnome-mime-text", size, 0);
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// Try Tango theme if no icon was found.
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// This code duplication (loop unrolling) was necessary
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// becuase something funny was happening with the icon loading
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// when using themes stored in an array.
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if (pixbuf == null) {
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theme = new IconTheme ();
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theme.CustomTheme = "Tango";
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if (theme.HasIcon (name)) {
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pixbuf = theme.LoadIcon (name, size, 0);
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else if (theme.HasIcon (name_noext)) {
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pixbuf = theme.LoadIcon (name_noext, size, 0);
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else if (name == "gnome-mime-text-plain" &&
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theme.HasIcon ("gnome-mime-text")) {
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pixbuf = theme.LoadIcon ("gnome-mime-text", size, 0);
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theme = IconTheme.Default;
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if (pixbuf == null && name.StartsWith ("gnome-mime") &&
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themes [0].HasIcon ("gtk-file")) {
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pixbuf = themes [0].LoadIcon ("gtk-file", size, 0);
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if (pixbuf == null && themes [0].HasIcon ("emblem-noread")) {
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pixbuf = themes [0].LoadIcon ("emblem-noread", size, 0);
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if (pixbuf == null) {
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throw new ArgumentNullException ("name");
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// The icon can be loaded from a loaded assembly if the icon has
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// the format: "resource@assemblyname".
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if (IconIsEmbeddedResource (name)) {
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pixbuf = IconFromEmbeddedResource (name, size);
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if (IconIsFile (name)) {
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pixbuf = IconFromFile (name, size);
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// Try to load icon from defaul theme.
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pixbuf = IconFromTheme (name, size, IconTheme.Default);
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// Try to load a generic file icon.
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if (pixbuf == null && name.StartsWith ("gnome-mime"))
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pixbuf = GenericFileIcon (size);
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// Try to load a pretty "no icon found" icon.
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pixbuf = UnknownIcon (size);
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// If all else fails, use the UnknownPixbuf.
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pixbuf = UnknownPixbuf;
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// Cache icon pixbuf.
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if (pixbuf != null && pixbuf != UnknownPixbuf) {
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pixbufCache [iconKey] = pixbuf;
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static void OnDefaultIconThemeChanged (object sender, EventArgs args)
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pixbufCache.Clear ();
added
removed
Do.Addins/src/Do.UI/IconProvider.cs
