1 files changed, 110 insertions, 0 deletions
diff --git a/src/utilities/renderedText.vala b/src/utilities/renderedText.vala
new file mode 100644
index 0000000..924742a
--- /dev/null
+++ b/src/utilities/renderedText.vala
@@ -0,0 +1,110 @@
+/* 
+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 string, rendered on an Image.
+/////////////////////////////////////////////////////////////////////////
+
+public class RenderedText : Image {
+
+    /////////////////////////////////////////////////////////////////////
+    /// A cache which stores images. It is cleared when the theme of
+    /// Gnome-Pie changes.
+    /// The key is in form <string>@<width>x<height>:<font>.
+    /////////////////////////////////////////////////////////////////////
+
+    private static Gee.HashMap<string, Cairo.ImageSurface?> cache { private get; private set; }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Initializes the cache.
+    /////////////////////////////////////////////////////////////////////
+    
+    public static void init() {
+        clear_cache();
+        
+        Config.global.notify["theme"].connect(() => {
+            clear_cache();
+        });
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Clears the cache.
+    /////////////////////////////////////////////////////////////////////
+    
+    static void clear_cache() {
+        cache = new Gee.HashMap<string, Cairo.ImageSurface?>();
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// C'tor, creates a new image representation of a string.
+    /////////////////////////////////////////////////////////////////////
+    
+    public RenderedText(string text, int width, int height, string font) {
+        var cached = this.cache.get("%s@%ux%u:%s".printf(text, width, height, font));
+        
+        if (cached == null) {
+            this.render_text(text, width, height, font);
+            this.cache.set("%s@%ux%u:%s".printf(text, width, height, font), this.surface);
+        } else {
+            this.surface = cached;
+        }
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Creates a new transparent image, with text written onto.
+    /////////////////////////////////////////////////////////////////////
+    
+    public void render_text(string text, int width, int height, string font) {
+        this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
+
+        var ctx = this.context();
+        
+        // set the color as specified in the current theme
+        Color color = Config.global.theme.caption_color;
+        ctx.set_source_rgb(color.r, color.g, color.g);
+        
+        var layout = Pango.cairo_create_layout(ctx);        
+        layout.set_width(Pango.units_from_double(width));
+        
+        var font_description = Pango.FontDescription.from_string(font);
+        font_description.set_size((int)(font_description.get_size() * Config.global.global_scale));
+        
+        layout.set_font_description(font_description);
+        layout.set_text(text, -1);
+        
+        // add newlines at the end of each line, in order to allow ellipsizing
+        string broken_string = "";
+        foreach (var line in layout.get_lines()) {
+            broken_string = broken_string.concat(text.substring(line.start_index, line.length), "\n");
+        }
+        layout.set_text(broken_string, broken_string.length-1);
+        
+        layout.set_ellipsize(Pango.EllipsizeMode.END);
+        layout.set_alignment(Pango.Alignment.CENTER);
+        
+        Pango.Rectangle extents;
+        layout.get_pixel_extents(null, out extents);
+        ctx.move_to(0, (int)(0.5*(height - extents.height)));
+        
+        Pango.cairo_update_layout(ctx, layout);
+        Pango.cairo_show_layout(ctx, layout);
+    }
+}
+
+}