...

1 files changed, 3 insertions, 3 deletions

diff --git a/include/cru/platform/native/input_method.hpp b/include/cru/platform/native/input_method.hpp
index 6ca85852..cce10d93 100644
--- a/include/cru/platform/native/input_method.hpp
+++ b/include/cru/platform/native/input_method.hpp
@@ -8,7 +8,7 @@
 namespace cru::platform::native {
 // It is a reference, so there is a ref count, remember to destroy it to release
 // the ref after use.
-struct IInputMethodContextRef : INativeResource {
+struct IInputMethodContextRef : virtual INativeResource {
   // Return true if you should draw composition text manually. Return false if
   // system will take care of that for you.
   virtual bool ShouldManuallyDrawCompositionText() = 0;
@@ -17,7 +17,7 @@ struct IInputMethodContextRef : INativeResource {
   // Get the composition string.
   virtual std::string GetCompositionText() = 0;
   // Set the candidate window lefttop. Use this method to prepare typing.
-  virtual void SetCandidateWindowPosition(const Point& point);
+  virtual void SetCandidateWindowPosition(const Point& point) = 0;
   // Triggered when user starts composition.
   virtual IEvent<std::nullptr_t>* CompositionStartEvent() = 0;
   // Triggered when user stops composition.
@@ -27,7 +27,7 @@ struct IInputMethodContextRef : INativeResource {
   virtual IEvent<std::string>* CompositionTextChangeEvent() = 0;
 };
 
-struct IInputMethodManager : INativeResource {
+struct IInputMethodManager : virtual INativeResource {
   // Get a reference of context of a window.
   virtual std::unique_ptr<IInputMethodContextRef> GetContext(
       INativeWindow* window) = 0;