1 files changed, 76 insertions, 0 deletions
diff --git a/src/page-icon.vala b/src/page-icon.vala
new file mode 100644
index 0000000..793ca5b
--- /dev/null
+++ b/src/page-icon.vala
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2009-2017 Canonical Ltd.
+ * Author: Robert Ancell <robert.ancell@canonical.com>,
+ *         Eduard Gotwig <g@ox.io>
+ *
+ * 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. See http://www.gnu.org/copyleft/gpl.html the full text of the
+ * license.
+ */
+
+public class PageIcon : Gtk.DrawingArea
+{
+    private string text;
+    private double r;
+    private double g;
+    private double b;
+    private const int MINIMUM_WIDTH = 20;
+
+    public PageIcon (string text, double r = 1.0, double g = 1.0, double b = 1.0)
+    {
+        this.text = text;
+        this.r = r;
+        this.g = g;
+        this.b = b;
+    }
+
+    public override void get_preferred_width (out int minimum_width, out int natural_width)
+    {
+        minimum_width = natural_width = MINIMUM_WIDTH;
+    }
+
+    public override void get_preferred_height (out int minimum_height, out int natural_height)
+    {
+        minimum_height = natural_height = (int) Math.round (MINIMUM_WIDTH * Math.SQRT2);
+    }
+
+    public override void get_preferred_height_for_width (int width, out int minimum_height, out int natural_height)
+    {
+        minimum_height = natural_height = (int) (width * Math.SQRT2);
+    }
+
+    public override void get_preferred_width_for_height (int height, out int minimum_width, out int natural_width)
+    {
+        minimum_width = natural_width = (int) (height / Math.SQRT2);
+    }
+
+    public override bool draw (Cairo.Context c)
+    {
+        var w = get_allocated_width ();
+        var h = get_allocated_height ();
+        if (w * Math.SQRT2 > h)
+            w = (int) Math.round (h / Math.SQRT2);
+        else
+            h = (int) Math.round (w * Math.SQRT2);
+
+        c.translate ((get_allocated_width () - w) / 2, (get_allocated_height () - h) / 2);
+
+        c.rectangle (0.5, 0.5, w - 1, h - 1);
+
+        c.set_source_rgb (r, g, b);
+        c.fill_preserve ();
+
+        c.set_line_width (1.0);
+        c.set_source_rgb (0.0, 0.0, 0.0);
+        c.stroke ();
+
+        Cairo.TextExtents extents;
+        c.text_extents (text, out extents);
+        c.translate ((w - extents.width) * 0.5 - 0.5, (h + extents.height) * 0.5 - 0.5);
+        c.show_text (text);
+
+        return true;
+    }
+}