New method: InputMethod::IsCandidatePopupOpen()

ui/base/ime/input_method_imm32.cc

Index: ui/base/ime/input_method_imm32.cc
diff --git a/ui/base/ime/input_method_imm32.cc b/ui/base/ime/input_method_imm32.cc
index 430be000864cd685076ecb11309820e12303b8be..2758ae98277ba6aa7560b1f730e188ee224fc2ce 100644
--- a/ui/base/ime/input_method_imm32.cc
+++ b/ui/base/ime/input_method_imm32.cc
@@ -14,7 +14,7 @@ namespace ui {
 InputMethodIMM32::InputMethodIMM32(internal::InputMethodDelegate* delegate,
                                    HWND toplevel_window_handle)
     : InputMethodWin(delegate, toplevel_window_handle),
-      enabled_(false) {
+      enabled_(false), is_popup_open_(false) {
 }
 
 void InputMethodIMM32::OnFocus() {
@@ -62,6 +62,10 @@ bool InputMethodIMM32::OnUntranslatedIMEMessage(
       original_result = OnDeadChar(
           event.message, event.wParam, event.lParam, &handled);
       break;
+    case WM_IME_NOTIFY:
+      original_result = OnImeNotify(
+          event.message, event.wParam, event.lParam, &handled);
+      break;
     default:
       NOTREACHED() << "Unknown IME message:" << event.message;
       break;
@@ -108,6 +112,10 @@ void InputMethodIMM32::SetFocusedTextInputClient(TextInputClient* client) {
   InputMethodWin::SetFocusedTextInputClient(client);
 }
 
+bool InputMethodIMM32::IsPopupOpen() const {
+  return is_popup_open_;
+}
+
 void InputMethodIMM32::OnWillChangeFocusedClient(
     TextInputClient* focused_before,
     TextInputClient* focused) {
@@ -217,6 +225,25 @@ LRESULT InputMethodIMM32::OnImeEndComposition(UINT message,
   return 0;
 }
 
+LRESULT InputMethodIMM32::OnImeNotify(UINT message,
+                                      WPARAM wparam,
+                                      LPARAM lparam,
+                                      BOOL* handled) {
+  *handled = FALSE;
+
+  // Update |is_popup_open_|, whether a candidate window is open or not.
+  switch (wparam) {
+  case IMN_OPENCANDIDATE:
+    is_popup_open_ = true;
+    break;
+  case IMN_CLOSECANDIDATE:
+    is_popup_open_ = false;
+    break;
+  }
+
+  return 0;
+}
+
 void InputMethodIMM32::ConfirmCompositionText() {
   if (!IsTextInputTypeNone()) {
     HWND attached_window = GetAttachedWindowHandle(GetTextInputClient());