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authorJörg Frings-Fürst <debian@jff-webhosting.net>2015-09-27 15:07:18 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2015-09-27 15:07:18 +0200
commite5da485f77b3b8cd3bc32c13e4497a64a2ad10c3 (patch)
treeb7351c6674108ea5746d70fdc2ff6c59bdc84595 /src/gui/tipViewer.vala
parentbbabe0f4e471dd984a1c01353c44d4eb1f336473 (diff)
parent16fe2e5d0525422ba6ca5db9e92a93d17caae302 (diff)
Merge new upstream release
Diffstat (limited to 'src/gui/tipViewer.vala')
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1 files changed, 163 insertions, 0 deletions
diff --git a/src/gui/tipViewer.vala b/src/gui/tipViewer.vala
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+/////////////////////////////////////////////////////////////////////////
+// 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/>.
+/////////////////////////////////////////////////////////////////////////
+
+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];
+ }
+ }
+}
+
+}