[gnome-nibbles/arnaudb/shortcuts-dialog: 3/7] Add hamburger menu toggle shortcut.

[Arnaud B. <arnaudb src gnome org>]

commit eed8b1777588a00bf4ce2a225f51d5dddddcd67a
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Jul 6 16:05:55 2020 +0200

    Add hamburger menu toggle shortcut.
    
    Would be great to pause the game,
    but that will be for another day.

 data/ui/nibbles.ui      |  2 +-
 src/gnome-nibbles.vala  | 11 ++++++-----
 src/nibbles-window.vala | 13 ++++++++++++-
 3 files changed, 19 insertions(+), 7 deletions(-)
---
diff --git a/data/ui/nibbles.ui b/data/ui/nibbles.ui
index 3cd4523..a284c33 100644
--- a/data/ui/nibbles.ui
+++ b/data/ui/nibbles.ui
@@ -85,7 +85,7 @@
           </packing>
         </child>
         <child>
-          <object class="GtkMenuButton">
+          <object class="GtkMenuButton" id="hamburger_menu">
             <property name="visible">True</property>
             <property name="can_focus">True</property>
             <property name="menu-model">app-menu</property>
diff --git a/src/gnome-nibbles.vala b/src/gnome-nibbles.vala
index 6cc6dad..78da960 100644
--- a/src/gnome-nibbles.vala
+++ b/src/gnome-nibbles.vala
@@ -89,11 +89,12 @@ private class Nibbles : Gtk.Application
 
         add_action_entries (action_entries, this);
 
-        set_accels_for_action ("win.new-game", {"<Primary>n"});
-        set_accels_for_action ("app.quit", {"<Primary>q"});
-        set_accels_for_action ("win.back", {"Escape"});
-        set_accels_for_action ("app.help", {"F1"});
-
+        set_accels_for_action ("win.new-game",  { "<Primary>n"      });
+        set_accels_for_action ("app.quit",      { "<Primary>q"      });
+        set_accels_for_action ("win.back",      {          "Escape" });
+        set_accels_for_action ("app.help",      {          "F1"     });
+        set_accels_for_action ("win.hamburger", {          "F10",
+                                                           "Menu"   });
         window = new NibblesWindow ();
         add_window (window);
     }
diff --git a/src/nibbles-window.vala b/src/nibbles-window.vala
index 59f72af..b6976f1 100644
--- a/src/nibbles-window.vala
+++ b/src/nibbles-window.vala
@@ -37,6 +37,7 @@ private class NibblesWindow : ApplicationWindow
 
     /* HeaderBar */
     [GtkChild] private HeaderBar headerbar;
+    [GtkChild] private MenuButton hamburger_menu;
     [GtkChild] private Button new_game_button;
     [GtkChild] private Button pause_button;
 
@@ -76,6 +77,8 @@ private class NibblesWindow : ApplicationWindow
 
     private const GLib.ActionEntry menu_entries[] =
     {
+        { "hamburger",      hamburger_cb    },
+
         { "new-game",       new_game_cb     },  // the "New Game" button
         { "pause",          pause_cb        },
         { "preferences",    preferences_cb, "i" },
@@ -234,7 +237,10 @@ private class NibblesWindow : ApplicationWindow
     private EventControllerKey key_controller;          // for keeping in memory
     private bool key_press_event_cb (EventControllerKey _key_controller, uint keyval, uint keycode, 
Gdk.ModifierType state)
     {
-        return game.handle_keypress (keyval);
+        if (hamburger_menu.active)
+            return false;
+        else
+            return game.handle_keypress (keyval);
     }
 
     private void size_allocate_cb (Allocation allocation)
@@ -381,6 +387,11 @@ private class NibblesWindow : ApplicationWindow
         }
     }
 
+    private void hamburger_cb ()
+    {
+        hamburger_menu.active = !hamburger_menu.active;
+    }
+
     /*\
     * * Settings changed events
     \*/