5 files changed, 14 insertions, 29 deletions
diff --git a/include/cru/platform/Check.hpp b/include/cru/platform/Check.hpp
index f4bbcfe8..d3180582 100644
--- a/include/cru/platform/Check.hpp
+++ b/include/cru/platform/Check.hpp
@@ -2,6 +2,8 @@
 #include "Exception.hpp"
 #include "Resource.hpp"
 
+#include "cru/common/StringUtil.hpp"
+
 #include <fmt/format.h>
 #include <memory>
 #include <type_traits>
@@ -9,14 +11,14 @@
 namespace cru::platform {
 template <typename TTarget>
 TTarget* CheckPlatform(INativeResource* resource,
-                       const std::string_view& target_platform) {
+                       const std::u16string_view& target_platform) {
   Expects(resource);
   const auto result = dynamic_cast<TTarget*>(resource);
   if (result == nullptr) {
     throw UnsupportPlatformException(fmt::format(
         "Try to convert resource to target platform failed. Platform id of "
         "resource to convert: {} . Target platform id: {} .",
-        resource->GetPlatformId(), target_platform));
+        ToUtf8(resource->GetPlatformId()), ToUtf8(target_platform)));
   }
   return result;
 }
@@ -24,7 +26,7 @@ TTarget* CheckPlatform(INativeResource* resource,
 template <typename TTarget, typename TSource>
 std::shared_ptr<TTarget> CheckPlatform(
     const std::shared_ptr<TSource>& resource,
-    const std::string_view& target_platform) {
+    const std::u16string_view& target_platform) {
   static_assert(std::is_base_of_v<INativeResource, TSource>,
                 "TSource must be a subclass of INativeResource.");
   Expects(resource);
@@ -33,7 +35,7 @@ std::shared_ptr<TTarget> CheckPlatform(
     throw UnsupportPlatformException(fmt::format(
         "Try to convert resource to target platform failed. Platform id of "
         "resource to convert: {} . Target platform id: {} .",
-        resource->GetPlatformId(), target_platform));
+        ToUtf8(resource->GetPlatformId()), ToUtf8(target_platform)));
   }
   return result;
 }
diff --git a/include/cru/platform/Resource.hpp b/include/cru/platform/Resource.hpp
index 72cfaf52..7a85d9c1 100644
--- a/include/cru/platform/Resource.hpp
+++ b/include/cru/platform/Resource.hpp
@@ -5,6 +5,6 @@
 
 namespace cru::platform {
 struct INativeResource : virtual Interface {
-  virtual std::string_view GetPlatformId() const = 0;
+  virtual std::u16string_view GetPlatformId() const = 0;
 };
 }  // namespace cru::platform
diff --git a/include/cru/platform/graph/Factory.hpp b/include/cru/platform/graph/Factory.hpp
index 0a425d15..b4e68f12 100644
--- a/include/cru/platform/graph/Factory.hpp
+++ b/include/cru/platform/graph/Factory.hpp
@@ -16,10 +16,10 @@ struct IGraphFactory : virtual INativeResource {
 
   virtual std::unique_ptr<IGeometryBuilder> CreateGeometryBuilder() = 0;
 
-  virtual std::unique_ptr<IFont> CreateFont(const std::string_view& font_family,
+  virtual std::unique_ptr<IFont> CreateFont(std::u16string font_family,
                                             float font_size) = 0;
 
   virtual std::unique_ptr<ITextLayout> CreateTextLayout(
-      std::shared_ptr<IFont> font, std::string text) = 0;
+      std::shared_ptr<IFont> font, std::u16string text) = 0;
 };
 }  // namespace cru::platform::graph
diff --git a/include/cru/platform/graph/TextLayout.hpp b/include/cru/platform/graph/TextLayout.hpp
index 4086ac56..7dd20987 100644
--- a/include/cru/platform/graph/TextLayout.hpp
+++ b/include/cru/platform/graph/TextLayout.hpp
@@ -6,8 +6,8 @@
 
 namespace cru::platform::graph {
 struct ITextLayout : virtual IGraphResource {
-  virtual std::string GetText() = 0;
-  virtual void SetText(std::string new_text) = 0;
+  virtual std::u16string GetText() = 0;
+  virtual void SetText(std::u16string new_text) = 0;
 
   virtual std::shared_ptr<IFont> GetFont() = 0;
   virtual void SetFont(std::shared_ptr<IFont> font) = 0;
@@ -17,7 +17,7 @@ struct ITextLayout : virtual IGraphResource {
 
   virtual Rect GetTextBounds() = 0;
   virtual std::vector<Rect> TextRangeRect(const TextRange& text_range) = 0;
-  virtual Point TextSinglePoint(gsl::index position, bool trailing) = 0;
+  virtual Point TextSinglePoint(Index position, bool trailing) = 0;
   virtual TextHitTestResult HitTest(const Point& point) = 0;
 };
 }  // namespace cru::platform::graph
diff --git a/include/cru/platform/native/InputMethod.hpp b/include/cru/platform/native/InputMethod.hpp
index 1ede15b2..1c5b287e 100644
--- a/include/cru/platform/native/InputMethod.hpp
+++ b/include/cru/platform/native/InputMethod.hpp
@@ -18,28 +18,11 @@ struct CompositionClause {
 using CompositionClauses = std::vector<CompositionClause>;
 
 struct CompositionText {
-  std::string text;
+  std::u16string text;
   CompositionClauses clauses;
   TextRange selection;
 };
 
-inline std::ostream& operator<<(std::ostream& stream,
-                                const CompositionText& composition_text) {
-  stream << "text: " << composition_text.text << "\n"
-         << "clauses:\n";
-  for (int i = 0; i < static_cast<int>(composition_text.clauses.size()); i++) {
-    const auto& clause = composition_text.clauses[i];
-    stream << "\t" << i << ". start:" << clause.start << " end:" << clause.end;
-    if (clause.target) {
-      stream << " target";
-    }
-    stream << "\n";
-  }
-  stream << "selection: position:" << composition_text.selection.position
-         << " count:" << composition_text.selection.count;
-  return stream;
-}
-
 struct IInputMethodContext : virtual INativeResource {
   // Return true if you should draw composition text manually. Return false if
   // system will take care of that for you.
@@ -67,7 +50,7 @@ struct IInputMethodContext : virtual INativeResource {
   // Triggered every time composition text changes.
   virtual IEvent<std::nullptr_t>* CompositionEvent() = 0;
 
-  virtual IEvent<std::string_view>* TextEvent() = 0;
+  virtual IEvent<std::u16string_view>* TextEvent() = 0;
 };
 
 struct IInputMethodManager : virtual INativeResource {