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authorAlessandro Ghedini <al3xbio@gmail.com>2012-01-21 19:14:06 +0100
committerAlessandro Ghedini <al3xbio@gmail.com>2012-01-21 19:19:46 +0100
commitc05883f47c498be4e11893e5178c5bc37ffd9f4a (patch)
treedbd3cd7ad3d7771405ad63af2f1e9d14d4ae5a35 /src/gui/piePreviewCenter.vala
parent31539042f11bc210a29e923f45586779c3ad46b2 (diff)
parent60560a030fda3c539ff9dc1563b9926414a193da (diff)
Merge commit 'upstream/0.4.0'
Diffstat (limited to 'src/gui/piePreviewCenter.vala')
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diff --git a/src/gui/piePreviewCenter.vala b/src/gui/piePreviewCenter.vala
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+/*
+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/>.
+*/
+
+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 = new Gtk.Style();
+
+ this.old_text = this.text;
+ this.text = new RenderedText.with_markup(text, 180, 180, style.font_desc.get_family()+" 10",
+ new Color.from_gdk(style.fg[0]), 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();
+ }
+}
+
+}