Imported Upstream version 0.6.6upstream/0.6.6

1 files changed, 163 insertions, 0 deletions

diff --git a/src/gui/tipViewer.vala b/src/gui/tipViewer.vala
new file mode 100644
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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];
+        }
+    }
+}
+
+}