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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();
}
}
}
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