[nostalgia/core] Add key event handler

src/nostalgia/core/context.hpp

@@ -68,6 +68,8 @@ class Context {
 	friend void setBgStatus(Context *ctx, unsigned bg, bool status) noexcept;
 	friend void setClipboardText(Context *ctx, const ox::String &text) noexcept;
 	friend void setUpdateHandler(Context *ctx, UpdateHandler h) noexcept;
+	friend constexpr void setKeyEventHandler(Context *ctx, KeyEventHandler h) noexcept;
+	friend constexpr KeyEventHandler keyEventHandler(Context *ctx) noexcept;
 	friend void setTile(Context *ctx, int layer, int column, int row, uint8_t tile) noexcept;
 	friend void setWindowTitle(Context *ctx, const char *title) noexcept;
 
@@ -75,6 +77,7 @@ class Context {
 		ox::UniquePtr<ox::FileSystem> rom;
 		ox::Vector<Drawer*, 5> drawers;
 		const char *appName = "Nostalgia";
+
 #ifndef OX_BARE_METAL
 		AssetManager assetManager;
 		int uninterruptedRefreshes = 3;
@@ -85,6 +88,7 @@ class Context {
 		// sets screen refresh to constant instead of only on event
 		bool constantRefresh = true;
 #endif
+		KeyEventHandler m_keyEventHandler = nullptr;
 		void *m_customData = nullptr;
 
 	private:
@@ -98,13 +102,13 @@ class Context {
 		Context(const Context &other) noexcept = delete;
 		Context(const Context &&other) noexcept = delete;
 
-	protected:
 		template<typename T>
 		[[nodiscard]]
 		constexpr T *windowerData() noexcept {
 			return static_cast<T*>(m_windowerData);
 		}
 
+	protected:
 		constexpr void setWindowerData(void *windowerData) noexcept {
 			m_windowerData = windowerData;
 		}
@@ -131,6 +135,14 @@ constexpr T *applicationData(Context *ctx) noexcept {
 	return static_cast<T*>(ctx->m_customData);
 }
 
+constexpr void setKeyEventHandler(Context *ctx, KeyEventHandler h) noexcept {
+	ctx->m_keyEventHandler = h;
+}
+
+constexpr KeyEventHandler keyEventHandler(Context *ctx) noexcept {
+	return ctx->m_keyEventHandler;
+}
+
 constexpr void setConstantRefresh([[maybe_unused]] Context *ctx, [[maybe_unused]] bool r) noexcept {
 #ifndef OX_BARE_METAL
 	ctx->constantRefresh = r;