diff options
Diffstat (limited to 'src/utilities/icon.vala')
-rw-r--r-- | src/utilities/icon.vala | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/src/utilities/icon.vala b/src/utilities/icon.vala new file mode 100644 index 0000000..1c8a9f4 --- /dev/null +++ b/src/utilities/icon.vala @@ -0,0 +1,102 @@ +/* +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; + } +} + +} |