New method: InputMethod::IsCandidatePopupOpen()

ui/views/ime/input_method_win.cc

Index: ui/views/ime/input_method_win.cc
diff --git a/ui/views/ime/input_method_win.cc b/ui/views/ime/input_method_win.cc
index 35c0a4252723dfe63c4da6deb70da5faf6839614..8230a34e8c2cff0f043ebe25561afc266630e03c 100644
--- a/ui/views/ime/input_method_win.cc
+++ b/ui/views/ime/input_method_win.cc
@@ -27,6 +27,7 @@ InputMethodWin::InputMethodWin(internal::InputMethodDelegate* delegate,
                                ui::InputMethod* host)
     : hwnd_(hwnd),
       active_(false),
+      is_popup_open_(false),
       direction_(base::i18n::UNKNOWN_DIRECTION),
       pending_requested_direction_(base::i18n::UNKNOWN_DIRECTION),
       host_(host) {
@@ -78,6 +79,10 @@ bool InputMethodWin::OnUntranslatedIMEMessage(const base::NativeEvent& event,
       original_result = OnImeRequest(
           event.message, event.wParam, event.lParam, &handled);
       break;
+    case WM_IME_NOTIFY:
+      original_result = OnImeNotify(
+          event.message, event.wParam, event.lParam, &handled);
+      break;
     case WM_CHAR:
     case WM_SYSCHAR:
       original_result = OnChar(
@@ -167,6 +172,10 @@ ui::TextInputClient* InputMethodWin::GetTextInputClient() const {
   return host_ ? host_->GetTextInputClient() : NULL;
 }
 
+bool InputMethodWin::IsPopupOpen() const {
+  return is_popup_open_;
+}
+
 void InputMethodWin::OnWillChangeFocus(View* focused_before, View* focused) {
   ConfirmCompositionText();
 }
@@ -274,6 +283,23 @@ LRESULT InputMethodWin::OnImeRequest(
   }
 }
 
+LRESULT InputMethodWin::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;
+}
+
 LRESULT InputMethodWin::OnChar(
     UINT message, WPARAM wparam, LPARAM lparam, BOOL* handled) {
   *handled = TRUE;