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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;
}
}
}
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