[gnome-games] nintendo-ds-runner: Change screen layout with Alt + 1, 2, 3, 4 shortcuts

[Alexander Mikhaylenko <alexm src gnome org>]

commit da96be0024287faff6c1c13d2912c7dc10769fdf
Author: Yetizone <andreii lisita gmail com>
Date:   Mon Apr 1 17:42:40 2019 +0300

    nintendo-ds-runner: Change screen layout with Alt + 1,2,3,4 shortcuts

 plugins/nintendo-ds/src/nintendo-ds-runner.vala | 26 +++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
---
diff --git a/plugins/nintendo-ds/src/nintendo-ds-runner.vala b/plugins/nintendo-ds/src/nintendo-ds-runner.vala
index 5c344185..98ec5712 100644
--- a/plugins/nintendo-ds/src/nintendo-ds-runner.vala
+++ b/plugins/nintendo-ds/src/nintendo-ds-runner.vala
@@ -5,8 +5,20 @@ private class Games.NintendoDsRunner : Object, Runner {
        private Settings settings;
        private ulong settings_changed_id;
 
+       // Map the 1,2,3,4 key values to the 4 screen layouts of the Nintendo DS
+       private static HashTable<uint, string> layouts;
+
        private const string SCREENS_LAYOUT_OPTION = "desmume_screens_layout";
 
+       static construct {
+               layouts = new HashTable<uint, string> (direct_hash, direct_equal);
+
+               layouts[Gdk.Key.@1] = "top/bottom";
+               layouts[Gdk.Key.@2] = "left/right";
+               layouts[Gdk.Key.@3] = "right/left";
+               layouts[Gdk.Key.@4] = "quick switch";
+       }
+
        public NintendoDsRunner (RetroRunner runner) {
                this.runner = runner;
 
@@ -125,6 +137,20 @@ private class Games.NintendoDsRunner : Object, Runner {
        }
 
        public bool key_press_event (Gdk.EventKey event) {
+               // First check for Alt + 1|2|3|4
+               // These shortcuts change the screen layout
+               var default_modifiers = Gtk.accelerator_get_default_mod_mask ();
+               if ((event.state & default_modifiers) == Gdk.ModifierType.MOD1_MASK) {
+                       // Alt key is pressed
+
+                       var shortcut_layout = layouts[event.keyval];
+                       if (shortcut_layout != null) {
+                               settings.set_string ("screen-layout", shortcut_layout);
+
+                               return true;
+                       }
+               }
+
                var layout = settings.get_string ("screen-layout");
 
                if (layout != "quick switch")