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+/*
+Copyright (c) 2011 by Simon Schneegans
+
+This program is free software: you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the Free
+Software Foundation, either version 3 of the License, or (at your option)
+any later version.
+
+This program 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 General Public License for
+more details.
+
+You should have received a copy of the GNU General Public License along with
+this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+namespace GnomePie {
+
+/////////////////////////////////////////////////////////////////////////
+/// A class representing a square-shaped icon, loaded from the users
+/// icon theme.
+/////////////////////////////////////////////////////////////////////////
+
+public class Icon : Image {
+
+ /////////////////////////////////////////////////////////////////////
+ /// A cache which stores loaded icon. It is cleared when the icon
+ /// theme of the user changes. The key is in form <filename>@<size>.
+ /////////////////////////////////////////////////////////////////////
+
+ private static Gee.HashMap<string, Cairo.ImageSurface?> cache { private get; private set; }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Initializes the cache.
+ /////////////////////////////////////////////////////////////////////
+
+ public static void init() {
+ clear_cache();
+
+ Gtk.IconTheme.get_default().changed.connect(() => {
+ clear_cache();
+ });
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Clears the cache.
+ /////////////////////////////////////////////////////////////////////
+
+ public static void clear_cache() {
+ cache = new Gee.HashMap<string, Cairo.ImageSurface?>();
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Loads an icon from the current icon theme of the user.
+ /////////////////////////////////////////////////////////////////////
+
+ public Icon(string icon_name, int size) {
+ var cached = this.cache.get("%s@%u".printf(icon_name, size));
+
+ if (cached == null) {
+ this.load_file_at_size(this.get_icon_file(icon_name, size), size, size);
+ this.cache.set("%s@%u".printf(icon_name, size), this.surface);
+ } else {
+ this.surface = cached;
+ }
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Returns the size of the icon in pixels. Greetings to Liskov.
+ /////////////////////////////////////////////////////////////////////
+
+ public int size() {
+ return base.width();
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Returns the filename for a given system icon.
+ /////////////////////////////////////////////////////////////////////
+
+ public static string get_icon_file(string icon_name, int size) {
+ string result = "";
+
+ var icon_theme = Gtk.IconTheme.get_default();
+ var file = icon_theme.lookup_icon(icon_name, size, 0);
+ if (file != null) result = file.get_filename();
+
+ if (result == "") {
+ warning("Icon \"" + icon_name + "\" not found! Using default icon...");
+ icon_name = "application-default-icon";
+ file = icon_theme.lookup_icon(icon_name, size, 0);
+ if (file != null) result = file.get_filename();
+ }
+
+ if (result == "")
+ warning("Icon \"" + icon_name + "\" not found! Will be ugly...");
+
+ return result;
+ }
+}
+
+}