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/////////////////////////////////////////////////////////////////////////
// Copyright (c) 2011-2017 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();
}
}
}
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