[gnome-games/wip/aplazas/konami-code: 1/2] ui: Add KonamiCode

[Adrien Plazas <aplazas src gnome org>]

commit c0c2e6bcfbb9eb62a19a0652ceb211ae3501fbdf
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sat Jul 23 08:35:56 2016 +0200

    ui: Add KonamiCode
    
    this will be used in next commit to monitor the Konami Code being
    performed on a keyboard.

 src/Makefile.am         |    1 +
 src/ui/konami-code.vala |   65 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index bf6f067..a9fcb6e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -122,6 +122,7 @@ gnome_games_SOURCES = \
        ui/error-info-bar.vala \
        ui/game-icon-view.vala \
        ui/game-thumbnail.vala \
+       ui/konami-code.vala \
        ui/media-selector.vala \
        ui/media-menu-button.vala \
        ui/preferences-page.vala \
diff --git a/src/ui/konami-code.vala b/src/ui/konami-code.vala
new file mode 100644
index 0000000..ba0b668
--- /dev/null
+++ b/src/ui/konami-code.vala
@@ -0,0 +1,65 @@
+// This file is part of GNOME Games. License: GPLv3
+
+private class Games.KonamiCode : Object {
+       public const string CODE_STRING = "↑ ↑ ↓ ↓ ← → ← → B A";
+
+       private const int[] CODE_LOWER_KEYS = {
+               Gdk.Key.Up,
+               Gdk.Key.Up,
+               Gdk.Key.Down,
+               Gdk.Key.Down,
+               Gdk.Key.Left,
+               Gdk.Key.Right,
+               Gdk.Key.Left,
+               Gdk.Key.Right,
+               Gdk.Key.b,
+               Gdk.Key.a,
+       };
+
+       private const int[] CODE_UPPER_KEYS = {
+               Gdk.Key.Up,
+               Gdk.Key.Up,
+               Gdk.Key.Down,
+               Gdk.Key.Down,
+               Gdk.Key.Left,
+               Gdk.Key.Right,
+               Gdk.Key.Left,
+               Gdk.Key.Right,
+               Gdk.Key.B,
+               Gdk.Key.A
+       };
+
+       private const int LAST_INDEX = 9;
+
+       public signal void code_performed ();
+
+       private uint current_index;
+
+       public KonamiCode (Gtk.Widget widget) {
+               widget.key_press_event.connect (on_key_pressed);
+       }
+
+       public void reset () {
+               current_index = 0;
+       }
+
+       private bool on_key_pressed (Gdk.EventKey event) {
+               if (event.keyval != CODE_LOWER_KEYS[current_index] &&
+                   event.keyval != CODE_UPPER_KEYS[current_index]) {
+                       current_index = 0;
+
+                       return false;
+               }
+
+               if (current_index == LAST_INDEX) {
+                       current_index = 0;
+                       code_performed ();
+
+                       return false;
+               }
+
+               current_index++;
+
+               return false;
+       }
+}