1 files changed, 55 insertions, 0 deletions
diff --git a/include/cru/platform/gui/InputMethod.h b/include/cru/platform/gui/InputMethod.h
new file mode 100644
index 00000000..45e11c06
--- /dev/null
+++ b/include/cru/platform/gui/InputMethod.h
@@ -0,0 +1,55 @@
+#pragma once
+#include "Base.h"
+
+#include "cru/common/Event.h"
+
+#include <memory>
+#include <vector>
+
+namespace cru::platform::gui {
+struct CompositionClause {
+  int start;
+  int end;
+  bool target;
+};
+
+using CompositionClauses = std::vector<CompositionClause>;
+
+struct CompositionText {
+  String text;
+  CompositionClauses clauses;
+  TextRange selection;
+};
+
+struct IInputMethodContext : virtual IPlatformResource {
+  // Return true if you should draw composition text manually. Return false if
+  // system will take care of that for you.
+  virtual bool ShouldManuallyDrawCompositionText() = 0;
+
+  virtual void EnableIME() = 0;
+
+  virtual void DisableIME() = 0;
+
+  virtual void CompleteComposition() = 0;
+
+  virtual void CancelComposition() = 0;
+
+  virtual CompositionText GetCompositionText() = 0;
+
+  // Set the candidate window lefttop. Relative to window lefttop. Use this
+  // method to prepare typing.
+  virtual void SetCandidateWindowPosition(const Point& point) = 0;
+
+  // Triggered when user starts composition.
+  virtual IEvent<std::nullptr_t>* CompositionStartEvent() = 0;
+
+  // Triggered when user stops composition.
+  virtual IEvent<std::nullptr_t>* CompositionEndEvent() = 0;
+
+  // Triggered every time composition text changes.
+  virtual IEvent<std::nullptr_t>* CompositionEvent() = 0;
+
+  virtual IEvent<StringView>* TextEvent() = 0;
+};
+}  // namespace cru::platform::gui
+