1 files changed, 102 insertions, 0 deletions
diff --git a/src/images/icon.vala b/src/images/icon.vala
new file mode 100644
index 0000000..1c8a9f4
--- /dev/null
+++ b/src/images/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;
+    }
+}
+
+}