1 files changed, 109 insertions, 0 deletions
diff --git a/src/gui/piePreviewCenter.vala b/src/gui/piePreviewCenter.vala
new file mode 100644
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+++ b/src/gui/piePreviewCenter.vala
@@ -0,0 +1,109 @@
+/////////////////////////////////////////////////////////////////////////
+// Copyright (c) 2011-2015 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/>.
+/////////////////////////////////////////////////////////////////////////
+
+using GLib.Math;
+
+namespace GnomePie {
+
+/////////////////////////////////////////////////////////////////////////
+///
+/////////////////////////////////////////////////////////////////////////
+
+public class PiePreviewCenter : GLib.Object {
+
+    /////////////////////////////////////////////////////////////////////
+    /// THe Images displayed. When the displayed text changes the
+    /// currently displayed text becomes the old_text. So it's possible
+    /// to create a smooth transitions.
+    /////////////////////////////////////////////////////////////////////
+
+    private RenderedText text = null;
+    private RenderedText old_text = null;
+
+    /////////////////////////////////////////////////////////////////////
+    /// Stores the currently displayed text in order to avoid frequent
+    /// and useless updates.
+    /////////////////////////////////////////////////////////////////////
+
+    private string current_text = null;
+
+    /////////////////////////////////////////////////////////////////////
+    /// An AnimatedValue for smooth transitions.
+    /////////////////////////////////////////////////////////////////////
+
+    private AnimatedValue blend;
+
+    /////////////////////////////////////////////////////////////////////
+    /// The parent renderer.
+    /////////////////////////////////////////////////////////////////////
+
+    private unowned PiePreviewRenderer parent;
+
+    /////////////////////////////////////////////////////////////////////
+    /// C'tor, sets everything up.
+    /////////////////////////////////////////////////////////////////////
+
+    public PiePreviewCenter(PiePreviewRenderer parent) {
+        this.parent = parent;
+        this.blend = new AnimatedValue.linear(0, 0, 0);
+
+        this.text = new RenderedText("", 1, 1, "", new Color(), 1.0);
+        this.old_text = text;
+    }
+
+    /////////////////////////////////////////////////////////////////////
+    /// Updates the currently displayed text. It will be smoothly
+    /// blended and may contain pango markup.
+    /////////////////////////////////////////////////////////////////////
+
+    public void set_text(string text) {
+        if (text != this.current_text) {
+
+            var style = parent.parent.get_style_context();
+
+            this.old_text = this.text;
+            this.text = new RenderedText.with_markup(
+                            text, 180, 180, style.get_font(Gtk.StateFlags.NORMAL).get_family()+" 10",
+                            new Color.from_gdk(style.get_color(Gtk.StateFlags.NORMAL)), 1.0);
+            this.current_text = text;
+
+            this.blend.reset_target(0.0, 0.0);
+            this.blend.reset_target(1.0, 0.1);
+        }
+    }
+
+    /////////////////////////////////////////////////////////////////////
+    /// Draws the center to the given context.
+    /////////////////////////////////////////////////////////////////////
+
+    public void draw(double frame_time, Cairo.Context ctx) {
+
+        this.blend.update(frame_time);
+
+        ctx.save();
+
+        if (this.parent.slice_count() == 0)
+            ctx.translate(0, 40);
+
+        this.old_text.paint_on(ctx, 1-this.blend.val);
+        this.text.paint_on(ctx, this.blend.val);
+
+        ctx.restore();
+    }
+}
+
+}