diff --git a/src/rime/gear/ascii_composer.cc b/src/rime/gear/ascii_composer.cc
index 91b809f3b1..440db93b82 100644
--- a/src/rime/gear/ascii_composer.cc
+++ b/src/rime/gear/ascii_composer.cc
@@ -56,8 +56,8 @@ AsciiComposer::~AsciiComposer() {
 }
 
 ProcessResult AsciiComposer::ProcessKeyEvent(const KeyEvent& key_event) {
-  if ((key_event.shift() && key_event.ctrl()) || key_event.alt() ||
-      key_event.hyper() || key_event.super()) {
+  if ((key_event.Shift() && key_event.Ctrl()) || key_event.Alt() ||
+      key_event.Hyper() || key_event.Super()) {
     shift_key_pressed_ = ctrl_key_pressed_ = false;
     return kNoop;
   }
@@ -103,7 +103,7 @@ ProcessResult AsciiComposer::ProcessKeyEvent(const KeyEvent& key_event) {
   // other keys
   shift_key_pressed_ = ctrl_key_pressed_ = false;
   // possible key binding: Control+x, Shift+space
-  if (key_event.ctrl() || (key_event.shift() && ch == XK_space)) {
+  if (key_event.Ctrl() || (key_event.Shift() && ch == XK_space)) {
     return kNoop;
   }
   Context* ctx = engine_->context();
@@ -135,19 +135,19 @@ ProcessResult AsciiComposer::ProcessCapsLock(const KeyEvent& key_event) {
           return kRejected;
         }
       }
-      toggle_with_caps_ = !key_event.caps();
+      toggle_with_caps_ = !key_event.Caps();
       // NOTE: for Linux, Caps Lock modifier is clear when we are about to
       // turn it on; for Windows it is the opposite:
       // Caps Lock modifier has been set before we process VK_CAPITAL.
       // here we assume IBus' behavior and invert caps with ! operation.
-      SwitchAsciiMode(!key_event.caps(), caps_lock_switch_style_);
+      SwitchAsciiMode(!key_event.Caps(), caps_lock_switch_style_);
       return kAccepted;
     } else {
       return kRejected;
     }
   }
-  if (key_event.caps()) {
-    if (!good_old_caps_lock_ && !key_event.release() && !key_event.ctrl() &&
+  if (key_event.Caps()) {
+    if (!good_old_caps_lock_ && !key_event.release() && !key_event.Ctrl() &&
         isascii(ch) && isalpha(ch)) {
       // output ascii characters ignoring Caps Lock
       if (islower(ch))
diff --git a/src/rime/gear/chord_composer.cc b/src/rime/gear/chord_composer.cc
index 639fcbde44..d6aee0f02d 100644
--- a/src/rime/gear/chord_composer.cc
+++ b/src/rime/gear/chord_composer.cc
@@ -75,17 +75,17 @@ static const char map_to_base_layer[] = {
 
 inline static int get_base_layer_key_code(const KeyEvent& key_event) {
   int ch = key_event.keycode();
-  bool is_shift = key_event.shift();
+  bool is_shift = key_event.Shift();
   return (is_shift && ch >= 0x20 && ch <= 0x7e) ? map_to_base_layer[ch - 0x20]
                                                 : ch;
 }
 
 ProcessResult ChordComposer::ProcessChordingKey(const KeyEvent& key_event) {
-  if (key_event.ctrl() || key_event.alt()) {
+  if (key_event.Ctrl() || key_event.Alt()) {
     raw_sequence_.clear();
   }
-  if ((key_event.ctrl() && !use_control_) || (key_event.alt() && !use_alt_) ||
-      (key_event.shift() && !use_shift_)) {
+  if ((key_event.Ctrl() && !use_control_) || (key_event.Alt() && !use_alt_) ||
+      (key_event.Shift() && !use_shift_)) {
     ClearChord();
     return kNoop;
   }
diff --git a/src/rime/gear/editor.cc b/src/rime/gear/editor.cc
index bec8ae1ff6..f40208a9d9 100644
--- a/src/rime/gear/editor.cc
+++ b/src/rime/gear/editor.cc
@@ -55,8 +55,8 @@ ProcessResult Editor::ProcessKeyEvent(const KeyEvent& key_event) {
       return result;
     }
   }
-  if (char_handler_ && !key_event.ctrl() && !key_event.alt() &&
-      !key_event.super() && !key_event.hyper() && ch > 0x20 && ch < 0x7f) {
+  if (char_handler_ && !key_event.Ctrl() && !key_event.Alt() &&
+      !key_event.Super() && !key_event.Hyper() && ch > 0x20 && ch < 0x7f) {
     DLOG(INFO) << "input char: '" << (char)ch << "', " << ch << ", '"
                << key_event.repr() << "'";
     return RIME_THIS_CALL(char_handler_)(ctx, ch);
diff --git a/src/rime/gear/key_binding_processor_impl.h b/src/rime/gear/key_binding_processor_impl.h
index e283770b14..ad0b4947a2 100644
--- a/src/rime/gear/key_binding_processor_impl.h
+++ b/src/rime/gear/key_binding_processor_impl.h
@@ -21,10 +21,10 @@ ProcessResult KeyBindingProcessor<T, N>::ProcessKeyEvent(
     return kAccepted;
   }
   // try to match the fallback options
-  if (key_event.ctrl() || key_event.alt()) {
+  if (key_event.Ctrl() || key_event.Alt()) {
     return kNoop;
   }
-  if (key_event.shift()) {
+  if (key_event.Shift()) {
     if ((fallback_options & ShiftAsControl) != 0) {
       KeyEvent shift_as_control{
           key_event.keycode(),
diff --git a/src/rime/gear/punctuator.cc b/src/rime/gear/punctuator.cc
index 096caef605..53fa4e6490 100644
--- a/src/rime/gear/punctuator.cc
+++ b/src/rime/gear/punctuator.cc
@@ -1,4 +1,4 @@
-// encoding: utf-8
+// encoding: utf-8
 //
 // Copyright RIME Developers
 // Distributed under the BSD License
@@ -59,8 +59,8 @@ static bool punctuation_is_translated(Context* ctx) {
 }
 
 ProcessResult Punctuator::ProcessKeyEvent(const KeyEvent& key_event) {
-  if (key_event.release() || key_event.ctrl() || key_event.alt() ||
-      key_event.hyper() || key_event.super())
+  if (key_event.release() || key_event.Ctrl() || key_event.Alt() ||
+      key_event.Hyper() || key_event.Super())
     return kNoop;
   int ch = key_event.keycode();
   if (ch < 0x20 || ch >= 0x7f)
diff --git a/src/rime/gear/recognizer.cc b/src/rime/gear/recognizer.cc
index aa8583a845..079c83f933 100644
--- a/src/rime/gear/recognizer.cc
+++ b/src/rime/gear/recognizer.cc
@@ -79,8 +79,8 @@ Recognizer::Recognizer(const Ticket& ticket) : Processor(ticket) {
 }
 
 ProcessResult Recognizer::ProcessKeyEvent(const KeyEvent& key_event) {
-  if (patterns_.empty() || key_event.ctrl() || key_event.alt() ||
-      key_event.hyper() || key_event.super() || key_event.release()) {
+  if (patterns_.empty() || key_event.Ctrl() || key_event.Alt() ||
+      key_event.Hyper() || key_event.Super() || key_event.release()) {
     return kNoop;
   }
   int ch = key_event.keycode();
diff --git a/src/rime/gear/selector.cc b/src/rime/gear/selector.cc
index 70a1a9f672..89e2b1d26c 100644
--- a/src/rime/gear/selector.cc
+++ b/src/rime/gear/selector.cc
@@ -116,8 +116,8 @@ inline static bool is_linear_layout(Context* ctx) {
 }
 
 ProcessResult Selector::ProcessKeyEvent(const KeyEvent& key_event) {
-  if (key_event.release() || key_event.alt() || key_event.hyper() ||
-      key_event.super())
+  if (key_event.release() || key_event.Alt() || key_event.Hyper() ||
+      key_event.Super())
     return kNoop;
   Context* ctx = engine_->context();
   if (ctx->composition().empty())
@@ -140,7 +140,7 @@ ProcessResult Selector::ProcessKeyEvent(const KeyEvent& key_event) {
   int ch = key_event.keycode();
   int index = -1;
   const string& select_keys(engine_->schema()->select_keys());
-  if (!select_keys.empty() && !key_event.ctrl() && ch >= 0x20 && ch < 0x7f) {
+  if (!select_keys.empty() && !key_event.Ctrl() && ch >= 0x20 && ch < 0x7f) {
     size_t pos = select_keys.find((char)ch);
     if (pos != string::npos) {
       index = static_cast<int>(pos);
diff --git a/src/rime/gear/shape.cc b/src/rime/gear/shape.cc
index c90ca45688..15dfe08cd3 100644
--- a/src/rime/gear/shape.cc
+++ b/src/rime/gear/shape.cc
@@ -39,8 +39,8 @@ ProcessResult ShapeProcessor::ProcessKeyEvent(const KeyEvent& key_event) {
   if (!engine_->context()->get_option("full_shape")) {
     return kNoop;
   }
-  if (key_event.ctrl() || key_event.alt() || key_event.hyper() ||
-      key_event.super() || key_event.release()) {
+  if (key_event.Ctrl() || key_event.Alt() || key_event.Hyper() ||
+      key_event.Super() || key_event.release()) {
     return kNoop;
   }
   int ch = key_event.keycode();
diff --git a/src/rime/gear/speller.cc b/src/rime/gear/speller.cc
index 85c13d17b4..0970891694 100644
--- a/src/rime/gear/speller.cc
+++ b/src/rime/gear/speller.cc
@@ -92,13 +92,13 @@ Speller::Speller(const Ticket& ticket)
 }
 
 ProcessResult Speller::ProcessKeyEvent(const KeyEvent& key_event) {
-  if (key_event.release() || key_event.ctrl() || key_event.alt() ||
-      key_event.hyper() || key_event.super())
+  if (key_event.release() || key_event.Ctrl() || key_event.Alt() ||
+      key_event.Hyper() || key_event.Super())
     return kNoop;
   int ch = key_event.keycode();
   if (ch < 0x20 || ch >= 0x7f)  // not a valid key for spelling
     return kNoop;
-  if (ch == XK_space && (!use_space_ || key_event.shift()))
+  if (ch == XK_space && (!use_space_ || key_event.Shift()))
     return kNoop;
   if (!belongs_to(ch, alphabet_) && !belongs_to(ch, delimiters_))
     return kNoop;
diff --git a/src/rime/key_event.h b/src/rime/key_event.h
index 58b34305ff..fc0d79873d 100644
--- a/src/rime/key_event.h
+++ b/src/rime/key_event.h
@@ -1,4 +1,4 @@
-// encoding: utf-8
+// encoding: utf-8
 //
 // Copyright RIME Developers
 // Distributed under the BSD License
@@ -26,12 +26,12 @@ class KeyEvent {
   int modifier() const { return modifier_; }
   void modifier(int value) { modifier_ = value; }
 
-  bool shift() const { return (modifier_ & kShiftMask) != 0; }
-  bool ctrl() const { return (modifier_ & kControlMask) != 0; }
-  bool alt() const { return (modifier_ & kAltMask) != 0; }
-  bool caps() const { return (modifier_ & kLockMask) != 0; }
-  bool super() const { return (modifier_ & kSuperMask) != 0; }
-  bool hyper() const { return (modifier_ & kHyperMask) != 0; }
+  bool Shift() const { return (modifier_ & kShiftMask) != 0; }
+  bool Ctrl() const { return (modifier_ & kControlMask) != 0; }
+  bool Alt() const { return (modifier_ & kAltMask) != 0; }
+  bool Caps() const { return (modifier_ & kLockMask) != 0; }
+  bool Super() const { return (modifier_ & kSuperMask) != 0; }
+  bool Hyper() const { return (modifier_ & kHyperMask) != 0; }
   bool release() const { return (modifier_ & kReleaseMask) != 0; }
   // 按鍵表示為形如「狀態+鍵名」的文字
   // 若無鍵名，則以四位或六位十六进制数形式的文字來標識
diff --git a/src/rime/switcher.cc b/src/rime/switcher.cc
index 7f6741883b..0e2bac8034 100644
--- a/src/rime/switcher.cc
+++ b/src/rime/switcher.cc
@@ -67,7 +67,7 @@ ProcessResult Switcher::ProcessKeyEvent(const KeyEvent& key_event) {
         return result;
       }
     }
-    if (key_event.release() || key_event.ctrl() || key_event.alt()) {
+    if (key_event.release() || key_event.Ctrl() || key_event.Alt()) {
       return kAccepted;
     }
     int ch = key_event.keycode();
diff --git a/test/key_event_test.cc b/test/key_event_test.cc
index 06eb740913..c0350f94d5 100644
--- a/test/key_event_test.cc
+++ b/test/key_event_test.cc
@@ -31,9 +31,9 @@ TEST(RimeKeyEventTest, BadKeyName) {
 
 TEST(RimeKeyEventTest, ModifiedKeyEvent) {
   KeyEvent ke(XK_A, kShiftMask | kControlMask | kReleaseMask);
-  EXPECT_TRUE(ke.shift());
-  EXPECT_FALSE(ke.alt());
-  EXPECT_TRUE(ke.ctrl());
+  EXPECT_TRUE(ke.Shift());
+  EXPECT_FALSE(ke.Alt());
+  EXPECT_TRUE(ke.Ctrl());
   EXPECT_TRUE(ke.release());
 }
 
@@ -48,16 +48,16 @@ TEST(RimeKeyEventTest, ParseKeyEventRepresentation) {
   KeyEvent ke;
   ASSERT_TRUE(ke.Parse("Shift+Control+Release+A"));
   EXPECT_EQ(XK_A, ke.keycode());
-  EXPECT_TRUE(ke.shift());
-  EXPECT_FALSE(ke.alt());
-  EXPECT_TRUE(ke.ctrl());
+  EXPECT_TRUE(ke.Shift());
+  EXPECT_FALSE(ke.Alt());
+  EXPECT_TRUE(ke.Ctrl());
   EXPECT_TRUE(ke.release());
 }
 
 TEST(RimeKeyEventTest, ConstructKeyEventFromRepresentation) {
   KeyEvent ke("Alt+F4");
   EXPECT_EQ(XK_F4, ke.keycode());
-  EXPECT_TRUE(ke.alt());
+  EXPECT_TRUE(ke.Alt());
   EXPECT_FALSE(ke.release());
 }
 
@@ -89,7 +89,7 @@ TEST(RimeKeySequenceTest, PlainString) {
   // "{Shift_L}{Shift+A}{Shift+Release+A}{Shift_L+Release}"
   // here we just focus on the information useful to the ime
   EXPECT_EQ(XK_A, ks[8].keycode());
-  EXPECT_FALSE(ks[8].shift());
+  EXPECT_FALSE(ks[8].Shift());
 }
 
 TEST(RimeKeySequenceTest, KeySequenceWithNamedKeys) {
@@ -104,15 +104,15 @@ TEST(RimeKeySequenceTest, KeySequenceWithModifiedKeys) {
   KeySequence ks("zyx 123{Shift+space}ABC{Control+Alt+Return}");
   ASSERT_EQ(12, ks.size());
   EXPECT_EQ(XK_space, ks[3].keycode());
-  EXPECT_FALSE(ks[3].shift());
+  EXPECT_FALSE(ks[3].Shift());
   EXPECT_FALSE(ks[3].release());
   EXPECT_EQ(XK_space, ks[7].keycode());
-  EXPECT_TRUE(ks[7].shift());
+  EXPECT_TRUE(ks[7].Shift());
   EXPECT_FALSE(ks[7].release());
   EXPECT_EQ(XK_Return, ks[11].keycode());
-  EXPECT_FALSE(ks[11].shift());
-  EXPECT_TRUE(ks[11].ctrl());
-  EXPECT_TRUE(ks[11].alt());
+  EXPECT_FALSE(ks[11].Shift());
+  EXPECT_TRUE(ks[11].Ctrl());
+  EXPECT_TRUE(ks[11].Alt());
   EXPECT_FALSE(ks[11].release());
 }