From 398fc4be37b3f5993571037ef86789f448546ab3 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Wed, 2 Jun 2021 09:47:37 +0200
Subject: [PATCH] Add `Keyboard.IsAnyKeyDown`

---
 Source/Engine/Input/Input.cpp  | 21 ++++++++++++++++++
 Source/Engine/Input/Keyboard.h | 39 +++++++---------------------------
 2 files changed, 29 insertions(+), 31 deletions(-)

diff --git a/Source/Engine/Input/Input.cpp b/Source/Engine/Input/Input.cpp
index d7796691b..44131504d 100644
--- a/Source/Engine/Input/Input.cpp
+++ b/Source/Engine/Input/Input.cpp
@@ -223,6 +223,27 @@ bool Mouse::Update(EventQueue& queue)
     return false;
 }
 
+void Keyboard::State::Clear()
+{
+    Platform::MemoryClear(this, sizeof(State));
+}
+
+Keyboard::Keyboard()
+    : InputDevice(SpawnParams(Guid::New(), TypeInitializer), TEXT("Keyboard"))
+{
+    _state.Clear();
+    _prevState.Clear();
+}
+
+bool Keyboard::IsAnyKeyDown() const
+{
+    // TODO: optimize with SIMD
+    bool result = false;
+    for (auto e : _state.Keys)
+        result |= e;
+    return result;
+}
+
 void Keyboard::OnCharInput(Char c, Window* target)
 {
     // Skip control characters
diff --git a/Source/Engine/Input/Keyboard.h b/Source/Engine/Input/Keyboard.h
index f182f9731..7877b3f13 100644
--- a/Source/Engine/Input/Keyboard.h
+++ b/Source/Engine/Input/Keyboard.h
@@ -10,48 +10,20 @@
 API_CLASS(NoSpawn) class FLAXENGINE_API Keyboard : public InputDevice
 {
 DECLARE_SCRIPTING_TYPE_NO_SPAWN(Keyboard);
-public:
+protected:
 
-    /// <summary>
-    /// The keyboard state.
-    /// </summary>
     struct State
     {
-        /// <summary>
-        /// The input text length (characters count).
-        /// </summary>
         uint16 InputTextLength;
-
-        /// <summary>
-        /// The input text.
-        /// </summary>
         Char InputText[32];
-
-        /// <summary>
-        /// The keys.
-        /// </summary>
         bool Keys[(int32)KeyboardKeys::MAX];
-
-        /// <summary>
-        /// Clears the state.
-        /// </summary>
-        void Clear()
-        {
-            Platform::MemoryClear(this, sizeof(State));
-        }
+        void Clear();
     };
 
-protected:
-
     State _state;
     State _prevState;
 
-    explicit Keyboard()
-        : InputDevice(SpawnParams(Guid::New(), TypeInitializer), TEXT("Keyboard"))
-    {
-        _state.Clear();
-        _prevState.Clear();
-    }
+    explicit Keyboard();
 
 public:
 
@@ -94,6 +66,11 @@ public:
         return !_state.Keys[static_cast<int32>(key)] && _prevState.Keys[static_cast<int32>(key)];
     }
 
+    /// <summary>
+    /// Checks if any keyboard key is currently pressed.
+    /// </summary>
+    API_PROPERTY() bool IsAnyKeyDown() const;
+
 public:
 
     /// <summary>