From 16fe2e5d0525422ba6ca5db9e92a93d17caae302 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Sun, 27 Sep 2015 15:05:13 +0200 Subject: Imported Upstream version 0.6.6 --- src/gui/tipViewer.vala | 163 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 src/gui/tipViewer.vala (limited to 'src/gui/tipViewer.vala') diff --git a/src/gui/tipViewer.vala b/src/gui/tipViewer.vala new file mode 100644 index 0000000..e2158bd --- /dev/null +++ b/src/gui/tipViewer.vala @@ -0,0 +1,163 @@ +///////////////////////////////////////////////////////////////////////// +// 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 . +///////////////////////////////////////////////////////////////////////// + +namespace GnomePie { + +///////////////////////////////////////////////////////////////////////// +/// A widget showing tips. The tips are beautifully faded in and out. +///////////////////////////////////////////////////////////////////////// + +public class TipViewer : Gtk.Label { + + ///////////////////////////////////////////////////////////////////// + /// Some settings tweaking the behavior of the TipViewer. + ///////////////////////////////////////////////////////////////////// + + private const double fade_time = 0.5; + private const double frame_rate = 20.0; + private const double base_delay = 3.0; + + ///////////////////////////////////////////////////////////////////// + /// False, if the playback of tips is stopped. + ///////////////////////////////////////////////////////////////////// + + private bool playing = false; + + ///////////////////////////////////////////////////////////////////// + /// An array containing all tips. + ///////////////////////////////////////////////////////////////////// + + private string[] tips; + + ///////////////////////////////////////////////////////////////////// + /// The index of the currently displayed tip. + ///////////////////////////////////////////////////////////////////// + + private int index = -1; + + ///////////////////////////////////////////////////////////////////// + /// The fading value. + ///////////////////////////////////////////////////////////////////// + + private AnimatedValue alpha; + + ///////////////////////////////////////////////////////////////////// + /// C'tor, initializes all members and sets the basic layout. + ///////////////////////////////////////////////////////////////////// + + public TipViewer(string[] tips) { + this.tips = tips; + + this.alpha = new AnimatedValue.linear(0.0, 1.0, fade_time); + + this.set_alignment (0.0f, 0.5f); + this.opacity = 0; + this.wrap = true; + this.valign = Gtk.Align.END; + this.set_use_markup(true); + + this.override_font(Pango.FontDescription.from_string("8")); + } + + ///////////////////////////////////////////////////////////////////// + /// Starts the playback of tips. + ///////////////////////////////////////////////////////////////////// + + public void start_slide_show() { + if (!this.playing && tips.length > 1) { + this.playing = true; + show_tip(); + } + } + + ///////////////////////////////////////////////////////////////////// + /// Stops the playback of tips. + ///////////////////////////////////////////////////////////////////// + + public void stop_slide_show() { + this.playing = false; + } + + ///////////////////////////////////////////////////////////////////// + /// Starts the fading in. + ///////////////////////////////////////////////////////////////////// + + private void fade_in() { + this.alpha = new AnimatedValue.linear(this.alpha.val, 1.0, fade_time); + + GLib.Timeout.add((uint)(1000.0/frame_rate), () => { + this.alpha.update(1.0/frame_rate); + this.opacity = this.alpha.val; + + return (this.alpha.val != 1.0); + }); + } + + ///////////////////////////////////////////////////////////////////// + /// Starts the fading out. + ///////////////////////////////////////////////////////////////////// + + private void fade_out() { + this.alpha = new AnimatedValue.linear(this.alpha.val, 0.0, fade_time); + + GLib.Timeout.add((uint)(1000.0/frame_rate), () => { + this.alpha.update(1.0/frame_rate); + this.opacity = this.alpha.val; + + return (this.alpha.val != 0.0); + }); + } + + private void show_tip() { + + this.set_random_tip(); + + this.fade_in(); + + uint delay = (uint)(base_delay*1000.0) + tips[this.index].length*30; + + GLib.Timeout.add(delay, () => { + this.fade_out(); + + if (this.playing) { + GLib.Timeout.add((uint)(1000.0*fade_time), () => { + this.show_tip(); + return false; + }); + } + + return false; + }); + } + + ///////////////////////////////////////////////////////////////////// + /// Chooses the next random tip. + ///////////////////////////////////////////////////////////////////// + + private void set_random_tip() { + if (tips.length > 1) { + int next_index = -1; + do { + next_index = GLib.Random.int_range(0, tips.length); + } while (next_index == this.index); + this.index = next_index; + this.label = tips[this.index]; + } + } +} + +} -- cgit v1.2.3