Imported Upstream version 14.04.10

1 files changed, 85 insertions, 0 deletions

diff --git a/src/fading-label.vala b/src/fading-label.vala
new file mode 100644
index 0000000..80977e6
--- /dev/null
+++ b/src/fading-label.vala
@@ -0,0 +1,85 @@
+/* -*- Mode: Vala; indent-tabs-mode: nil; tab-width: 4 -*-
+ *
+ * Copyright (C) 2012 Canonical Ltd
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * 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/>.
+ *
+ * Authors: Michael Terry <michael.terry@canonical.com>
+ */
+
+public class FadingLabel : Gtk.Label
+{
+    private Cairo.Surface cached_surface;
+
+    public FadingLabel (string text)
+    {
+        Object (label: text);
+    }
+
+    public override void get_preferred_width (out int minimum, out int natural)
+    {
+        base.get_preferred_width (out minimum, out natural);
+        minimum = 0;
+    }
+
+    public override void get_preferred_width_for_height (int height, out int minimum, out int natural)
+    {
+        base.get_preferred_width_for_height (height, out minimum, out natural);
+        minimum = 0;
+    }
+
+    public override void size_allocate (Gtk.Allocation allocation)
+    {
+        base.size_allocate (allocation);
+        cached_surface = null;
+    }
+
+    private Cairo.Surface make_surface (Cairo.Context orig_c)
+    {
+        int w, h;
+        get_layout ().get_pixel_size (out w, out h);
+
+        var bw = get_allocated_width ();
+        var bh = get_allocated_height ();
+
+        var surface = new Cairo.Surface.similar (orig_c.get_target (), Cairo.Content.COLOR_ALPHA, bw, bh);
+        var c = new Cairo.Context (surface);
+
+        if (w > bw)
+        {
+            c.push_group ();
+            base.draw (c);
+            c.pop_group_to_source ();
+
+            var mask = new Cairo.Pattern.linear (0, 0, bw, 0);
+            mask.add_color_stop_rgba (1.0 - 27.0 / bw, 1.0, 1.0, 1.0, 1.0);
+            mask.add_color_stop_rgba (1.0 - 21.6 / bw, 1.0, 1.0, 1.0, 0.5);
+            mask.add_color_stop_rgba (1.0, 1.0, 1.0, 1.0, 0.0);
+
+            c.mask (mask);
+        }
+        else
+            base.draw (c);
+
+        return surface;
+    }
+
+    public override bool draw (Cairo.Context c)
+    {
+        if (cached_surface == null)
+            cached_surface = make_surface (c);
+        c.set_source_surface (cached_surface, 0, 0);
+        c.paint ();
+        return false;
+    }
+}