diff --git a/src/input/crossterm.rs b/src/input/crossterm.rs
index 3ee1c7b..cd7d094 100644
--- a/src/input/crossterm.rs
+++ b/src/input/crossterm.rs
@@ -4,7 +4,7 @@ use crate::crossterm::event::{
 };
 
 impl From<Event> for Input {
-    /// Convert [`crossterm::event::Event`] to [`Input`].
+    /// Convert [`crossterm::event::Event`] into [`Input`].
     fn from(event: Event) -> Self {
         match event {
             Event::Key(key) => Self::from(key),
@@ -14,18 +14,10 @@ impl From<Event> for Input {
     }
 }
 
-impl From<KeyEvent> for Input {
-    /// Convert [`crossterm::event::KeyEvent`] to [`Input`].
-    fn from(key: KeyEvent) -> Self {
-        if key.kind == KeyEventKind::Release {
-            // On Windows or when `crossterm::event::PushKeyboardEnhancementFlags` is set,
-            // key release event can be reported. Ignore it. (#14)
-            return Self::default();
-        }
-
-        let ctrl = key.modifiers.contains(KeyModifiers::CONTROL);
-        let alt = key.modifiers.contains(KeyModifiers::ALT);
-        let key = match key.code {
+impl From<KeyCode> for Key {
+    /// Convert [`crossterm::event::KeyCode`] into [`Key`].
+    fn from(code: KeyCode) -> Self {
+        match code {
             KeyCode::Char(c) => Key::Char(c),
             KeyCode::Backspace => Key::Backspace,
             KeyCode::Enter => Key::Enter,
@@ -42,20 +34,42 @@ impl From<KeyEvent> for Input {
             KeyCode::Esc => Key::Esc,
             KeyCode::F(x) => Key::F(x),
             _ => Key::Null,
-        };
+        }
+    }
+}
+
+impl From<KeyEvent> for Input {
+    /// Convert [`crossterm::event::KeyEvent`] into [`Input`].
+    fn from(key: KeyEvent) -> Self {
+        if key.kind == KeyEventKind::Release {
+            // On Windows or when `crossterm::event::PushKeyboardEnhancementFlags` is set,
+            // key release event can be reported. Ignore it. (#14)
+            return Self::default();
+        }
+
+        let ctrl = key.modifiers.contains(KeyModifiers::CONTROL);
+        let alt = key.modifiers.contains(KeyModifiers::ALT);
+        let key = Key::from(key.code);
 
         Self { key, ctrl, alt }
     }
 }
 
-impl From<MouseEvent> for Input {
-    /// Convert [`crossterm::event::MouseEvent`] to [`Input`].
-    fn from(mouse: MouseEvent) -> Self {
-        let key = match mouse.kind {
+impl From<MouseEventKind> for Key {
+    /// Convert [`crossterm::event::MouseEventKind`] into [`Key`].
+    fn from(kind: MouseEventKind) -> Self {
+        match kind {
             MouseEventKind::ScrollDown => Key::MouseScrollDown,
             MouseEventKind::ScrollUp => Key::MouseScrollUp,
             _ => Key::Null,
-        };
+        }
+    }
+}
+
+impl From<MouseEvent> for Input {
+    /// Convert [`crossterm::event::MouseEvent`] into [`Input`].
+    fn from(mouse: MouseEvent) -> Self {
+        let key = Key::from(mouse.kind);
         let ctrl = mouse.modifiers.contains(KeyModifiers::CONTROL);
         let alt = mouse.modifiers.contains(KeyModifiers::ALT);
         Self { key, ctrl, alt }
@@ -172,9 +186,9 @@ mod tests {
     // Regression for https://github.com/rhysd/tui-textarea/issues/14
     #[test]
     fn ignore_key_release_event() {
-        let mut k = key_event(KeyCode::Char('a'), KeyModifiers::empty());
-        k.kind = KeyEventKind::Release;
-        let want = input(Key::Null, false, false);
-        assert_eq!(Input::from(k.clone()), want, "{:?} -> {:?}", k, want);
+        let mut from = key_event(KeyCode::Char('a'), KeyModifiers::empty());
+        from.kind = KeyEventKind::Release;
+        let to = input(Key::Null, false, false);
+        assert_eq!(Input::from(from), to, "{:?} -> {:?}", from, to);
     }
 }
diff --git a/src/input/termion.rs b/src/input/termion.rs
index 12a23d7..aa2f68f 100644
--- a/src/input/termion.rs
+++ b/src/input/termion.rs
@@ -2,7 +2,7 @@ use super::{Input, Key};
 use termion::event::{Event, Key as KeyEvent, MouseButton, MouseEvent};
 
 impl From<Event> for Input {
-    /// Convert [`termion::event::Event`] to [`Input`].
+    /// Convert [`termion::event::Event`] into [`Input`].
     fn from(event: Event) -> Self {
         match event {
             Event::Key(key) => Self::from(key),
@@ -13,7 +13,7 @@ impl From<Event> for Input {
 }
 
 impl From<KeyEvent> for Input {
-    /// Convert [`termion::event::Key`] to [`Input`].
+    /// Convert [`termion::event::Key`] into [`Input`].
     fn from(key: KeyEvent) -> Self {
         let mut ctrl = false;
         let mut alt = false;
@@ -48,13 +48,24 @@ impl From<KeyEvent> for Input {
     }
 }
 
+impl From<MouseButton> for Key {
+    /// Convert [`termion::event::MouseButton`] into [`Key`].
+    fn from(button: MouseButton) -> Self {
+        match button {
+            MouseButton::WheelUp => Key::MouseScrollUp,
+            MouseButton::WheelDown => Key::MouseScrollDown,
+            _ => Key::Null,
+        }
+    }
+}
+
 impl From<MouseEvent> for Input {
-    /// Convert [`termion::event::MouseEvent`] to [`Input`].
+    /// Convert [`termion::event::MouseEvent`] into [`Input`].
     fn from(mouse: MouseEvent) -> Self {
-        let key = match mouse {
-            MouseEvent::Press(MouseButton::WheelUp, ..) => Key::MouseScrollUp,
-            MouseEvent::Press(MouseButton::WheelDown, ..) => Key::MouseScrollDown,
-            _ => return Self::default(),
+        let key = if let MouseEvent::Press(button, ..) = mouse {
+            Key::from(button)
+        } else {
+            Key::Null
         };
         Self {
             key,
diff --git a/src/input/termwiz.rs b/src/input/termwiz.rs
index ab5ff1a..ad82891 100644
--- a/src/input/termwiz.rs
+++ b/src/input/termwiz.rs
@@ -4,7 +4,7 @@ use termwiz::input::{
 };
 
 impl From<InputEvent> for Input {
-    /// Convert [`termwiz::input::InputEvent`] to [`Input`].
+    /// Convert [`termwiz::input::InputEvent`] into [`Input`].
     fn from(input: InputEvent) -> Self {
         match input {
             InputEvent::Key(key) => Self::from(key),
@@ -15,11 +15,10 @@ impl From<InputEvent> for Input {
     }
 }
 
-impl From<KeyEvent> for Input {
-    /// Convert [`termwiz::input::KeyEvent`] to [`Input`].
-    fn from(key: KeyEvent) -> Self {
-        let KeyEvent { key, modifiers } = key;
-        let key = match key {
+impl From<KeyCode> for Key {
+    /// Convert [`termwiz::input::KeyCode`] into [`Key`].
+    fn from(key: KeyCode) -> Self {
+        match key {
             KeyCode::Char(c) => Key::Char(c),
             KeyCode::Backspace => Key::Backspace,
             KeyCode::Tab => Key::Tab,
@@ -36,7 +35,15 @@ impl From<KeyEvent> for Input {
             KeyCode::Delete => Key::Delete,
             KeyCode::Function(x) => Key::F(x),
             _ => Key::Null,
-        };
+        }
+    }
+}
+
+impl From<KeyEvent> for Input {
+    /// Convert [`termwiz::input::KeyEvent`] into [`Input`].
+    fn from(key: KeyEvent) -> Self {
+        let KeyEvent { key, modifiers } = key;
+        let key = Key::from(key);
         let ctrl = modifiers.contains(Modifiers::CTRL);
         let alt = modifiers.contains(Modifiers::ALT);
 
@@ -45,7 +52,7 @@ impl From<KeyEvent> for Input {
 }
 
 impl From<MouseButtons> for Key {
-    /// Convert [`termwiz::input::MouseButtons`] to [`Key`].
+    /// Convert [`termwiz::input::MouseButtons`] into [`Key`].
     fn from(buttons: MouseButtons) -> Self {
         if buttons.contains(MouseButtons::VERT_WHEEL) {
             if buttons.contains(MouseButtons::WHEEL_POSITIVE) {
@@ -60,7 +67,7 @@ impl From<MouseButtons> for Key {
 }
 
 impl From<MouseEvent> for Input {
-    /// Convert [`termwiz::input::MouseEvent`] to [`Input`].
+    /// Convert [`termwiz::input::MouseEvent`] into [`Input`].
     fn from(mouse: MouseEvent) -> Self {
         let MouseEvent {
             mouse_buttons,
@@ -76,13 +83,14 @@ impl From<MouseEvent> for Input {
 }
 
 impl From<PixelMouseEvent> for Input {
-    /// Convert [`termwiz::input::PixelMouseEvent`] to [`Input`].
+    /// Convert [`termwiz::input::PixelMouseEvent`] into [`Input`].
     fn from(mouse: PixelMouseEvent) -> Self {
         let PixelMouseEvent {
             mouse_buttons,
             modifiers,
             ..
         } = mouse;
+
         let key = Key::from(mouse_buttons);
         let ctrl = modifiers.contains(Modifiers::CTRL);
         let alt = modifiers.contains(Modifiers::ALT);