Merge pull request #15031 from Joehuu/ui-scaling-keybind

Add ability to change ui scaling via keyboard

osu.Game/OsuGame.cs

@@ -158,6 +158,8 @@ namespace osu.Game
 
         private Bindable<int> configRuleset;
 
+        private Bindable<float> uiScale;
+
         private Bindable<int> configSkin;
 
         private readonly string[] args;
@@ -219,6 +221,7 @@ namespace osu.Game
 
             // bind config int to database RulesetInfo
             configRuleset = LocalConfig.GetBindable<int>(OsuSetting.Ruleset);
+            uiScale = LocalConfig.GetBindable<float>(OsuSetting.UIScale);
 
             var preferredRuleset = RulesetStore.GetRuleset(configRuleset.Value);
 
@@ -1020,6 +1023,28 @@ namespace osu.Game
             return false;
         }
 
+        public override bool OnPressed(KeyBindingPressEvent<PlatformAction> e)
+        {
+            const float adjustment_increment = 0.05f;
+
+            switch (e.Action)
+            {
+                case PlatformAction.ZoomIn:
+                    uiScale.Value += adjustment_increment;
+                    return true;
+
+                case PlatformAction.ZoomOut:
+                    uiScale.Value -= adjustment_increment;
+                    return true;
+
+                case PlatformAction.ZoomDefault:
+                    uiScale.SetDefault();
+                    return true;
+            }
+
+            return base.OnPressed(e);
+        }
+
         #region Inactive audio dimming
 
         private readonly BindableDouble inactiveVolumeFade = new BindableDouble();