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/////////////////////////////////////////////////////////////////////////
// Copyright (c) 2011-2017 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 = Icon.cache.get("%s@%u".printf(icon_name, size));
if (cached == null) {
this.load_file_at_size(Icon.get_icon_file(icon_name, size), size, size);
Icon.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) {
if (icon_name.contains("/")) {
var file = GLib.File.new_for_path(icon_name);
if(file.query_exists()) {
return icon_name;
}
}
var icon_theme = Gtk.IconTheme.get_default();
var file = icon_theme.lookup_icon(icon_name, size, 0);
if (file != null) {
return file.get_filename();
}
try {
file = icon_theme.lookup_by_gicon(GLib.Icon.new_for_string(icon_name), size, 0);
if (file != null) {
return file.get_filename();
}
} catch(GLib.Error e) {}
warning("Icon \"" + icon_name + "\" not found! Using default icon...");
string[] default_icons = {"image-missing", "application-default-icon"};
foreach (var icon in default_icons) {
file = icon_theme.lookup_icon(icon, size, 0);
if (file != null) {
return file.get_filename();
}
}
warning("No default icon found! Will be ugly...");
return "";
}
}
}
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