diff --git a/headers/enduro2d/core/_core.hpp b/headers/enduro2d/core/_core.hpp
index d7b2d6e3..3267910c 100644
--- a/headers/enduro2d/core/_core.hpp
+++ b/headers/enduro2d/core/_core.hpp
@@ -13,6 +13,8 @@
 namespace e2d
 {
     class debug;
+    class mouse;
+    class keyboard;
     class input;
     class vfs;
     class window;
diff --git a/headers/enduro2d/core/input.hpp b/headers/enduro2d/core/input.hpp
index 57ab0d3a..a04dc338 100644
--- a/headers/enduro2d/core/input.hpp
+++ b/headers/enduro2d/core/input.hpp
@@ -11,45 +11,78 @@
 
 namespace e2d
 {
-    class bad_input_operation final : public exception {
+    class mouse final : private noncopyable {
     public:
-        const char* what() const noexcept final {
-            return "bad input operation";
-        }
+        mouse();
+        ~mouse() noexcept;
+
+        bool is_any_button_pressed() const noexcept;
+        bool is_any_button_just_pressed() const noexcept;
+        bool is_any_button_just_released() const noexcept;
+
+        bool is_button_pressed(mouse_button btn) const noexcept;
+        bool is_button_just_pressed(mouse_button btn) const noexcept;
+        bool is_button_just_released(mouse_button btn) const noexcept;
+
+        void extract_pressed_buttons(std::vector<mouse_button>& dst) const;
+        void extract_just_pressed_buttons(std::vector<mouse_button>& dst) const;
+        void extract_just_released_buttons(std::vector<mouse_button>& dst) const;
+    private:
+        class state;
+        friend class input;
+        std::unique_ptr<state> state_;
+    };
+
+    class keyboard final : private noncopyable {
+    public:
+        keyboard();
+        ~keyboard() noexcept;
+
+        bool is_any_key_pressed() const noexcept;
+        bool is_any_key_just_pressed() const noexcept;
+        bool is_any_key_just_released() const noexcept;
+
+        bool is_key_pressed(keyboard_key key) const noexcept;
+        bool is_key_just_pressed(keyboard_key key) const noexcept;
+        bool is_key_just_released(keyboard_key key) const noexcept;
+
+        void extract_pressed_keys(std::vector<keyboard_key>& dst) const;
+        void extract_just_pressed_keys(std::vector<keyboard_key>& dst) const;
+        void extract_just_released_keys(std::vector<keyboard_key>& dst) const;
+    private:
+        class state;
+        friend class input;
+        std::unique_ptr<state> state_;
     };
 
     class input final : public module<input> {
+    public:
+        struct input_char_event {
+            char32_t uchar = 0;
+        };
+        struct mouse_button_event {
+            mouse_button button = mouse_button::unknown;
+            mouse_button_action action = mouse_button_action::unknown;
+        };
+        struct keyboard_key_event {
+            keyboard_key key = keyboard_key::unknown;
+            keyboard_key_action action = keyboard_key_action::unknown;
+        };
     public:
         input();
         ~input() noexcept;
 
-        bool is_any_mouse_button_pressed() const noexcept;
-        bool is_any_mouse_button_just_pressed() const noexcept;
-        bool is_any_mouse_button_just_released() const noexcept;
+        str32 input_text() const;
+        void extract_input_text(str32& dst) const;
 
-        bool is_any_keyboard_key_pressed() const noexcept;
-        bool is_any_keyboard_key_just_pressed() const noexcept;
-        bool is_any_keyboard_key_just_released() const noexcept;
+        const mouse& mouse() const noexcept;
+        const keyboard& keyboard() const noexcept;
 
-        bool is_mouse_button_pressed(mouse_button btn) const noexcept;
-        bool is_mouse_button_just_pressed(mouse_button btn) const noexcept;
-        bool is_mouse_button_just_released(mouse_button btn) const noexcept;
-
-        bool is_keyboard_key_pressed(keyboard_key key) const noexcept;
-        bool is_keyboard_key_just_pressed(keyboard_key key) const noexcept;
-        bool is_keyboard_key_just_released(keyboard_key key) const noexcept;
-
-        void extract_pressed_mouse_buttons(std::vector<mouse_button>& dst) const;
-        void extract_just_pressed_mouse_buttons(std::vector<mouse_button>& dst) const;
-        void extract_just_released_mouse_buttons(std::vector<mouse_button>& dst) const;
-
-        void extract_pressed_keyboard_keys(std::vector<keyboard_key>& dst) const;
-        void extract_just_pressed_keyboard_keys(std::vector<keyboard_key>& dst) const;
-        void extract_just_released_keyboard_keys(std::vector<keyboard_key>& dst) const;
+        void post_event(input_char_event evt) noexcept;
+        void post_event(mouse_button_event evt) noexcept;
+        void post_event(keyboard_key_event evt) noexcept;
 
         void frame_tick() noexcept;
-        void post_event(keyboard_key key, keyboard_key_action act) noexcept;
-        void post_event(mouse_button btn, mouse_button_action act) noexcept;
     private:
         class state;
         std::unique_ptr<state> state_;
@@ -58,6 +91,7 @@ namespace e2d
     class window_input_source : public window::event_listener {
     public:
         window_input_source(input& input) noexcept;
+        void on_input_char(char32_t uchar) noexcept final;
         void on_mouse_button(mouse_button btn, mouse_button_action act) noexcept final;
         void on_keyboard_key(keyboard_key key, u32 scancode, keyboard_key_action act) noexcept final;
     private:
diff --git a/samples/sources/sample_00/sample_00.cpp b/samples/sources/sample_00/sample_00.cpp
index 7bd9d45f..d4df0407 100644
--- a/samples/sources/sample_00/sample_00.cpp
+++ b/samples/sources/sample_00/sample_00.cpp
@@ -21,7 +21,8 @@ int main() {
      .trace("SAMPLE: window virtual size: %0", w.virtual_size())
      .trace("SAMPLE: window framebuffer size: %0", w.framebuffer_size());
 
-    while ( !w.should_close() && !i.is_keyboard_key_just_released(keyboard_key::escape) ) {
+    const keyboard& k = i.keyboard();
+    while ( !w.should_close() && !k.is_key_just_released(keyboard_key::escape) ) {
         i.frame_tick();
         w.swap_buffers();
         window::frame_tick();
diff --git a/samples/sources/sample_01/sample_01.cpp b/samples/sources/sample_01/sample_01.cpp
index 7bd9d45f..d4df0407 100644
--- a/samples/sources/sample_01/sample_01.cpp
+++ b/samples/sources/sample_01/sample_01.cpp
@@ -21,7 +21,8 @@ int main() {
      .trace("SAMPLE: window virtual size: %0", w.virtual_size())
      .trace("SAMPLE: window framebuffer size: %0", w.framebuffer_size());
 
-    while ( !w.should_close() && !i.is_keyboard_key_just_released(keyboard_key::escape) ) {
+    const keyboard& k = i.keyboard();
+    while ( !w.should_close() && !k.is_key_just_released(keyboard_key::escape) ) {
         i.frame_tick();
         w.swap_buffers();
         window::frame_tick();
diff --git a/sources/enduro2d/core/input.cpp b/sources/enduro2d/core/input.cpp
index 17f6567f..d008b5af 100644
--- a/sources/enduro2d/core/input.cpp
+++ b/sources/enduro2d/core/input.cpp
@@ -8,6 +8,23 @@
 
 namespace
 {
+    using namespace e2d;
+
+    enum class button_state : u8 {
+        pressed,
+        released,
+        just_pressed,
+        just_released
+    };
+
+    void update_button_state(enum button_state& state) noexcept {
+        if ( state == button_state::just_pressed ) {
+            state = button_state::pressed;
+        } else if ( state == button_state::just_released ) {
+            state = button_state::released;
+        }
+    }
+
     template < typename E >
     constexpr std::underlying_type_t<E> enum_to_number(E e) noexcept {
         return static_cast<std::underlying_type_t<E>>(e);
@@ -16,53 +33,308 @@ namespace
 
 namespace e2d
 {
+    //
+    // class mouse::state
+    //
+
+    class mouse::state final : private e2d::noncopyable {
+    public:
+        mutable std::mutex mutex;
+        std::array<button_state, enum_to_number(mouse_button::unknown) + 1> button_states;
+        char _pad[2];
+    public:
+        state() noexcept {
+            std::fill(
+                button_states.begin(),
+                button_states.end(),
+                button_state::released);
+        }
+
+        std::size_t button_index(mouse_button btn) const noexcept {
+            const auto index = enum_to_number(btn);
+            E2D_ASSERT(index < button_states.size());
+            return math::numeric_cast<std::size_t>(index);
+        }
+
+        void frame_tick() noexcept {
+            std::lock_guard<std::mutex> guard(mutex);
+            std::for_each(
+                button_states.begin(),
+                button_states.end(),
+                &update_button_state);
+        }
+
+        void post_event(input::mouse_button_event evt) noexcept {
+            std::lock_guard<std::mutex> guard(mutex);
+            const std::size_t index = button_index(evt.button);
+            const enum button_state ms = button_states[index];
+            switch ( evt.action ) {
+                case mouse_button_action::press:
+                    if ( ms == button_state::released || ms == button_state::just_released ) {
+                        button_states[index] = button_state::just_pressed;
+                    }
+                    break;
+                case mouse_button_action::release:
+                    if ( ms == button_state::just_pressed || ms == button_state::pressed ) {
+                        button_states[index] = button_state::just_released;
+                    }
+                    break;
+                case mouse_button_action::unknown:
+                    break;
+                default:
+                    E2D_ASSERT_MSG(false, "unexpected mouse action");
+                    break;
+            }
+        }
+    };
+
+    //
+    // class keyboard::state
+    //
+
+    class keyboard::state final : private e2d::noncopyable {
+    public:
+        mutable std::mutex mutex;
+        std::array<button_state, enum_to_number(keyboard_key::unknown) + 1> key_states;
+    public:
+        state() noexcept {
+            std::fill(
+                key_states.begin(),
+                key_states.end(),
+                button_state::released);
+        }
+
+        std::size_t key_index(keyboard_key key) const noexcept {
+            const auto index = enum_to_number(key);
+            E2D_ASSERT(index < key_states.size());
+            return math::numeric_cast<std::size_t>(index);
+        }
+
+        void frame_tick() noexcept {
+            std::lock_guard<std::mutex> guard(mutex);
+            std::for_each(
+                key_states.begin(),
+                key_states.end(),
+                &update_button_state);
+        }
+
+        void post_event(input::keyboard_key_event evt) noexcept {
+            std::lock_guard<std::mutex> guard(mutex);
+            const std::size_t index = key_index(evt.key);
+            const enum button_state ks = key_states[index];
+            switch ( evt.action ) {
+                case keyboard_key_action::press:
+                case keyboard_key_action::repeat:
+                    if ( ks == button_state::released || ks == button_state::just_released ) {
+                        key_states[index] = button_state::just_pressed;
+                    }
+                    break;
+                case keyboard_key_action::release:
+                    if ( ks == button_state::pressed || ks == button_state::just_pressed ) {
+                        key_states[index] = button_state::just_released;
+                    }
+                    break;
+                case keyboard_key_action::unknown:
+                    break;
+                default:
+                    E2D_ASSERT_MSG(false, "unexpected key action");
+                    break;
+            }
+        }
+    };
+
+    //
+    // class mouse
+    //
+
+    mouse::mouse()
+    : state_(new state()) {}
+    mouse::~mouse() noexcept = default;
+
+    bool mouse::is_any_button_pressed() const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        return std::any_of(
+            state_->button_states.cbegin(),
+            state_->button_states.cend(),
+            [](button_state s) noexcept {
+                return s == button_state::just_pressed
+                    || s == button_state::pressed;
+            });
+    }
+
+    bool mouse::is_any_button_just_pressed() const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        return std::any_of(
+            state_->button_states.cbegin(),
+            state_->button_states.cend(),
+            [](button_state s) noexcept {
+                return s == button_state::just_pressed;
+            });
+    }
+
+    bool mouse::is_any_button_just_released() const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        return std::any_of(
+            state_->button_states.cbegin(),
+            state_->button_states.cend(),
+            [](button_state s) noexcept {
+                return s == button_state::just_released;
+            });
+    }
+
+    bool mouse::is_button_pressed(mouse_button btn) const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        const std::size_t index = state_->button_index(btn);
+        const enum button_state ms = state_->button_states[index];
+        return ms == button_state::just_pressed
+            || ms == button_state::pressed;
+    }
+
+    bool mouse::is_button_just_pressed(mouse_button btn) const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        const std::size_t index = state_->button_index(btn);
+        const enum button_state ms = state_->button_states[index];
+        return ms == button_state::just_pressed;
+    }
+
+    bool mouse::is_button_just_released(mouse_button btn) const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        const std::size_t index = state_->button_index(btn);
+        const enum button_state ms = state_->button_states[index];
+        return ms == button_state::just_released;
+    }
+
+    void mouse::extract_pressed_buttons(std::vector<mouse_button>& dst) const {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        for ( std::size_t i = 0; i < state_->button_states.size(); ++i ) {
+            button_state ks = state_->button_states[i];
+            if ( ks == button_state::just_pressed || ks == button_state::pressed ) {
+                dst.push_back(static_cast<mouse_button>(i));
+            }
+        }
+    }
+
+    void mouse::extract_just_pressed_buttons(std::vector<mouse_button>& dst) const {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        for ( std::size_t i = 0; i < state_->button_states.size(); ++i ) {
+            button_state ks = state_->button_states[i];
+            if ( ks == button_state::just_pressed ) {
+                dst.push_back(static_cast<mouse_button>(i));
+            }
+        }
+    }
+
+    void mouse::extract_just_released_buttons(std::vector<mouse_button>& dst) const {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        for ( std::size_t i = 0; i < state_->button_states.size(); ++i ) {
+            button_state ks = state_->button_states[i];
+            if ( ks == button_state::just_released ) {
+                dst.push_back(static_cast<mouse_button>(i));
+            }
+        }
+    }
+
+    //
+    // class keyboard
+    //
+
+    keyboard::keyboard()
+    : state_(new state()) {}
+    keyboard::~keyboard() noexcept = default;
+
+    bool keyboard::is_any_key_pressed() const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        return std::any_of(
+            state_->key_states.cbegin(),
+            state_->key_states.cend(),
+            [](button_state s) noexcept {
+                return s == button_state::just_pressed
+                    || s == button_state::pressed;
+            });
+    }
+
+    bool keyboard::is_any_key_just_pressed() const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        return std::any_of(
+            state_->key_states.cbegin(),
+            state_->key_states.cend(),
+            [](button_state s) noexcept {
+                return s == button_state::just_pressed;
+            });
+    }
+
+    bool keyboard::is_any_key_just_released() const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        return std::any_of(
+            state_->key_states.cbegin(),
+            state_->key_states.cend(),
+            [](button_state s) noexcept {
+                return s == button_state::just_released;
+            });
+    }
+
+    bool keyboard::is_key_pressed(keyboard_key key) const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        const std::size_t index = state_->key_index(key);
+        const enum button_state ks = state_->key_states[index];
+        return ks == button_state::just_pressed
+            || ks == button_state::pressed;
+    }
+
+    bool keyboard::is_key_just_pressed(keyboard_key key) const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        const std::size_t index = state_->key_index(key);
+        const enum button_state ks = state_->key_states[index];
+        return ks == button_state::just_pressed;
+    }
+
+    bool keyboard::is_key_just_released(keyboard_key key) const noexcept {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        const std::size_t index = state_->key_index(key);
+        const enum button_state ks = state_->key_states[index];
+        return ks == button_state::just_released;
+    }
+
+    void keyboard::extract_pressed_keys(std::vector<keyboard_key>& dst) const {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        for ( std::size_t i = 0; i < state_->key_states.size(); ++i ) {
+            button_state ks = state_->key_states[i];
+            if ( ks == button_state::just_pressed || ks == button_state::pressed ) {
+                dst.push_back(static_cast<keyboard_key>(i));
+            }
+        }
+    }
+
+    void keyboard::extract_just_pressed_keys(std::vector<keyboard_key>& dst) const {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        for ( std::size_t i = 0; i < state_->key_states.size(); ++i ) {
+            button_state ks = state_->key_states[i];
+            if ( ks == button_state::just_pressed ) {
+                dst.push_back(static_cast<keyboard_key>(i));
+            }
+        }
+    }
+
+    void keyboard::extract_just_released_keys(std::vector<keyboard_key>& dst) const {
+        std::lock_guard<std::mutex> guard(state_->mutex);
+        for ( std::size_t i = 0; i < state_->key_states.size(); ++i ) {
+            button_state ks = state_->key_states[i];
+            if ( ks == button_state::just_released ) {
+                dst.push_back(static_cast<keyboard_key>(i));
+            }
+        }
+    }
+
     //
     // class input::state
     //
 
     class input::state final : private e2d::noncopyable {
     public:
-        enum class button_state : u8 {
-            pressed,
-            released,
-            just_pressed,
-            just_released
-        };
-        mutable std::mutex mutex;
-        std::array<button_state, enum_to_number(keyboard_key::unknown) + 1> key_button_states;
-        std::array<button_state, enum_to_number(mouse_button::unknown) + 1> mouse_button_states;
-        char _pad[2];
-    public:
-        state() noexcept {
-            std::fill(
-                key_button_states.begin(),
-                key_button_states.end(),
-                button_state::released);
-            std::fill(
-                mouse_button_states.begin(),
-                mouse_button_states.end(),
-                button_state::released);
-        }
-
-        std::size_t mouse_button_index(mouse_button btn) const noexcept {
-            const auto index = enum_to_number(btn);
-            E2D_ASSERT(index < mouse_button_states.size());
-            return math::numeric_cast<std::size_t>(index);
-        }
-
-        std::size_t keyboard_key_index(keyboard_key key) const noexcept {
-            const auto index = enum_to_number(key);
-            E2D_ASSERT(index < key_button_states.size());
-            return math::numeric_cast<std::size_t>(index);
-        }
-
-        static void update_button_state(enum button_state& state) noexcept {
-            if ( state == button_state::just_pressed ) {
-                state = button_state::pressed;
-            } else if ( state == button_state::just_released ) {
-                state = button_state::released;
-            }
-        }
+        std::mutex mutex;
+        str32 input_text;
+        class mouse mouse;
+        class keyboard keyboard;
     };
 
     //
@@ -73,229 +345,44 @@ namespace e2d
     : state_(new state()) {}
     input::~input() noexcept = default;
 
-    bool input::is_any_mouse_button_pressed() const noexcept {
+    str32 input::input_text() const {
         std::lock_guard<std::mutex> guard(state_->mutex);
-        return std::any_of(
-            state_->mouse_button_states.cbegin(),
-            state_->mouse_button_states.cend(),
-            [](state::button_state s) noexcept {
-                return s == state::button_state::just_pressed
-                    || s == state::button_state::pressed;
-            });
+        return state_->input_text;
     }
 
-    bool input::is_any_mouse_button_just_pressed() const noexcept {
+    void input::extract_input_text(str32& dst) const {
         std::lock_guard<std::mutex> guard(state_->mutex);
-        return std::any_of(
-            state_->mouse_button_states.cbegin(),
-            state_->mouse_button_states.cend(),
-            [](state::button_state s) noexcept {
-                return s == state::button_state::just_pressed;
-            });
+        dst = state_->input_text;
     }
 
-    bool input::is_any_mouse_button_just_released() const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        return std::any_of(
-            state_->mouse_button_states.cbegin(),
-            state_->mouse_button_states.cend(),
-            [](state::button_state s) noexcept {
-                return s == state::button_state::just_released;
-            });
+    const mouse& input::mouse() const noexcept {
+        return state_->mouse;
     }
 
-    bool input::is_any_keyboard_key_pressed() const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        return std::any_of(
-            state_->key_button_states.cbegin(),
-            state_->key_button_states.cend(),
-            [](state::button_state s) noexcept {
-                return s == state::button_state::just_pressed
-                    || s == state::button_state::pressed;
-            });
+    const keyboard& input::keyboard() const noexcept {
+        return state_->keyboard;
     }
 
-    bool input::is_any_keyboard_key_just_pressed() const noexcept {
+    void input::post_event(input_char_event evt) noexcept {
         std::lock_guard<std::mutex> guard(state_->mutex);
-        return std::any_of(
-            state_->key_button_states.cbegin(),
-            state_->key_button_states.cend(),
-            [](state::button_state s) noexcept {
-                return s == state::button_state::just_pressed;
-            });
+        state_->input_text += evt.uchar;
     }
 
-    bool input::is_any_keyboard_key_just_released() const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        return std::any_of(
-            state_->key_button_states.cbegin(),
-            state_->key_button_states.cend(),
-            [](state::button_state s) noexcept {
-                return s == state::button_state::just_released;
-            });
+    void input::post_event(mouse_button_event evt) noexcept {
+        state_->mouse.state_->post_event(evt);
     }
 
-    bool input::is_mouse_button_pressed(mouse_button btn) const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        const std::size_t index = state_->mouse_button_index(btn);
-        const enum state::button_state ms = state_->mouse_button_states[index];
-        return ms == state::button_state::just_pressed
-            || ms == state::button_state::pressed;
-    }
-
-    bool input::is_mouse_button_just_pressed(mouse_button btn) const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        const std::size_t index = state_->mouse_button_index(btn);
-        const enum state::button_state ms = state_->mouse_button_states[index];
-        return ms == state::button_state::just_pressed;
-    }
-
-    bool input::is_mouse_button_just_released(mouse_button btn) const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        const std::size_t index = state_->mouse_button_index(btn);
-        const enum state::button_state ms = state_->mouse_button_states[index];
-        return ms == state::button_state::just_released;
-    }
-
-    bool input::is_keyboard_key_pressed(keyboard_key key) const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        const std::size_t index = state_->keyboard_key_index(key);
-        const enum state::button_state ks = state_->key_button_states[index];
-        return ks == state::button_state::just_pressed
-            || ks == state::button_state::pressed;
-    }
-
-    bool input::is_keyboard_key_just_pressed(keyboard_key key) const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        const std::size_t index = state_->keyboard_key_index(key);
-        const enum state::button_state ks = state_->key_button_states[index];
-        return ks == state::button_state::just_pressed;
-    }
-
-    bool input::is_keyboard_key_just_released(keyboard_key key) const noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        const std::size_t index = state_->keyboard_key_index(key);
-        const enum state::button_state ks = state_->key_button_states[index];
-        return ks == state::button_state::just_released;
-    }
-
-    void input::extract_pressed_mouse_buttons(std::vector<mouse_button>& dst) const {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        for ( std::size_t i = 0; i < state_->mouse_button_states.size(); ++i ) {
-            state::button_state ks = state_->mouse_button_states[i];
-            if ( ks == state::button_state::just_pressed || ks == state::button_state::pressed ) {
-                dst.push_back(static_cast<mouse_button>(i));
-            }
-        }
-    }
-
-    void input::extract_just_pressed_mouse_buttons(std::vector<mouse_button>& dst) const {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        for ( std::size_t i = 0; i < state_->mouse_button_states.size(); ++i ) {
-            state::button_state ks = state_->mouse_button_states[i];
-            if ( ks == state::button_state::just_pressed ) {
-                dst.push_back(static_cast<mouse_button>(i));
-            }
-        }
-    }
-
-    void input::extract_just_released_mouse_buttons(std::vector<mouse_button>& dst) const {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        for ( std::size_t i = 0; i < state_->mouse_button_states.size(); ++i ) {
-            state::button_state ks = state_->mouse_button_states[i];
-            if ( ks == state::button_state::just_released ) {
-                dst.push_back(static_cast<mouse_button>(i));
-            }
-        }
-    }
-
-    void input::extract_pressed_keyboard_keys(std::vector<keyboard_key>& dst) const {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        for ( std::size_t i = 0; i < state_->key_button_states.size(); ++i ) {
-            state::button_state ks = state_->key_button_states[i];
-            if ( ks == state::button_state::just_pressed || ks == state::button_state::pressed ) {
-                dst.push_back(static_cast<keyboard_key>(i));
-            }
-        }
-    }
-
-    void input::extract_just_pressed_keyboard_keys(std::vector<keyboard_key>& dst) const {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        for ( std::size_t i = 0; i < state_->key_button_states.size(); ++i ) {
-            state::button_state ks = state_->key_button_states[i];
-            if ( ks == state::button_state::just_pressed ) {
-                dst.push_back(static_cast<keyboard_key>(i));
-            }
-        }
-    }
-
-    void input::extract_just_released_keyboard_keys(std::vector<keyboard_key>& dst) const {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        for ( std::size_t i = 0; i < state_->key_button_states.size(); ++i ) {
-            state::button_state ks = state_->key_button_states[i];
-            if ( ks == state::button_state::just_released ) {
-                dst.push_back(static_cast<keyboard_key>(i));
-            }
-        }
+    void input::post_event(keyboard_key_event evt) noexcept {
+        state_->keyboard.state_->post_event(evt);
     }
 
     void input::frame_tick() noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        std::for_each(
-            state_->key_button_states.begin(),
-            state_->key_button_states.end(),
-            &state::update_button_state);
-        std::for_each(
-            state_->mouse_button_states.begin(),
-            state_->mouse_button_states.end(),
-            &state::update_button_state);
-    }
-
-    void input::post_event(keyboard_key key, keyboard_key_action action) noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        const std::size_t index = state_->keyboard_key_index(key);
-        const enum state::button_state ks = state_->key_button_states[index];
-        switch ( action ) {
-            case keyboard_key_action::press:
-            case keyboard_key_action::repeat:
-                if ( ks == state::button_state::released || ks == state::button_state::just_released ) {
-                    state_->key_button_states[index] = state::button_state::just_pressed;
-                }
-                break;
-            case keyboard_key_action::release:
-                if ( ks == state::button_state::pressed || ks == state::button_state::just_pressed ) {
-                    state_->key_button_states[index] = state::button_state::just_released;
-                }
-                break;
-            case keyboard_key_action::unknown:
-                break;
-            default:
-                E2D_ASSERT_MSG(false, "unexpected key action");
-                break;
-        }
-    }
-
-    void input::post_event(mouse_button mouse, mouse_button_action action) noexcept {
-        std::lock_guard<std::mutex> guard(state_->mutex);
-        const std::size_t index = state_->mouse_button_index(mouse);
-        const enum state::button_state ms = state_->mouse_button_states[index];
-        switch ( action ) {
-            case mouse_button_action::press:
-                if ( ms == state::button_state::released || ms == state::button_state::just_released ) {
-                    state_->mouse_button_states[index] = state::button_state::just_pressed;
-                }
-                break;
-            case mouse_button_action::release:
-                if ( ms == state::button_state::just_pressed || ms == state::button_state::pressed ) {
-                    state_->mouse_button_states[index] = state::button_state::just_released;
-                }
-                break;
-            case mouse_button_action::unknown:
-                break;
-            default:
-                E2D_ASSERT_MSG(false, "unexpected mouse action");
-                break;
+        {
+            std::lock_guard<std::mutex> guard(state_->mutex);
+            state_->input_text.clear();
         }
+        state_->mouse.state_->frame_tick();
+        state_->keyboard.state_->frame_tick();
     }
 
     //
@@ -305,12 +392,16 @@ namespace e2d
     window_input_source::window_input_source(input& input) noexcept
     : input_(input) {}
 
+    void window_input_source::on_input_char(char32_t uchar) noexcept {
+        input_.post_event({uchar});
+    }
+
     void window_input_source::on_keyboard_key(keyboard_key key, u32 scancode, keyboard_key_action act) noexcept {
         E2D_UNUSED(scancode);
-        input_.post_event(key, act);
+        input_.post_event({key, act});
     }
 
     void window_input_source::on_mouse_button(mouse_button btn, mouse_button_action act) noexcept {
-        input_.post_event(btn, act);
+        input_.post_event({btn, act});
     }
 }