Impl sdl input method context.

7 files changed, 162 insertions, 37 deletions

diff --git a/include/cru/platform/gui/InputMethod.h b/include/cru/platform/gui/InputMethod.h
index 2d5d0b76..e2c34432 100644
--- a/include/cru/platform/gui/InputMethod.h
+++ b/include/cru/platform/gui/InputMethod.h
@@ -64,3 +64,9 @@ struct IInputMethodContext : virtual IPlatformResource {
   virtual IEvent<const std::string&>* TextEvent() = 0;
 };
 }  // namespace cru::platform::gui
+
+#define CRU_DEFINE_CRU_PLATFORM_GUI_I_INPUT_METHOD_OVERRIDE_EVENTS() \
+  CRU_DEFINE_EVENT_OVERRIDE(CompositionStart, std::nullptr_t)        \
+  CRU_DEFINE_EVENT_OVERRIDE(CompositionEnd, std::nullptr_t)          \
+  CRU_DEFINE_EVENT_OVERRIDE(Composition, std::nullptr_t)             \
+  CRU_DEFINE_EVENT_OVERRIDE(Text, const std::string&)
diff --git a/include/cru/platform/gui/sdl/InputMethod.h b/include/cru/platform/gui/sdl/InputMethod.h
new file mode 100644
index 00000000..77a78999
--- /dev/null
+++ b/include/cru/platform/gui/sdl/InputMethod.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "Base.h"
+
+#include <cru/platform/gui/InputMethod.h>
+
+#include <SDL3/SDL_events.h>
+#include <SDL3/SDL_video.h>
+
+namespace cru::platform::gui::sdl {
+class SdlWindow;
+
+class SdlInputMethodContext : public SdlResource,
+                              public virtual IInputMethodContext {
+  friend SdlWindow;
+
+ public:
+  explicit SdlInputMethodContext(SdlWindow* window);
+
+  bool ShouldManuallyDrawCompositionText() override;
+  void EnableIME() override;
+  void DisableIME() override;
+
+  /**
+   * Note: SDL doesn't support this. So it actually calls CancelComposition().
+   */
+  void CompleteComposition() override;
+  void CancelComposition() override;
+
+  CompositionText GetCompositionText() override;
+
+  void SetCandidateWindowPosition(const Point& point) override;
+
+  CRU_DEFINE_CRU_PLATFORM_GUI_I_INPUT_METHOD_OVERRIDE_EVENTS()
+
+ private:
+  bool HandleEvent(const SDL_Event* event);
+
+ private:
+  SdlWindow* window_;
+};
+}  // namespace cru::platform::gui::sdl
diff --git a/include/cru/platform/gui/sdl/Window.h b/include/cru/platform/gui/sdl/Window.h
index 58dd9785..aaa0c725 100644
--- a/include/cru/platform/gui/sdl/Window.h
+++ b/include/cru/platform/gui/sdl/Window.h
@@ -6,10 +6,10 @@
 
 #include <SDL3/SDL_events.h>
 #include <SDL3/SDL_video.h>
-#include <optional>
 
 namespace cru::platform::gui::sdl {
 class SdlUiApplication;
+class SdlInputMethodContext;
 
 class SdlWindow : public SdlResource, public virtual INativeWindow {
   CRU_DEFINE_CLASS_LOG_TAG("cru::platform::gui::xcb::SdlWindow")
@@ -79,7 +79,8 @@ class SdlWindow : public SdlResource, public virtual INativeWindow {
   IInputMethodContext* GetInputMethodContext() override;
 
  public:
-  std::optional<SDL_Window*> GetSdlWindow();
+  SDL_Window* GetSdlWindow();
+  SDL_WindowID GetSdlWindowId();
   SdlUiApplication* GetSdlUiApplication();
   float GetDisplayScale();
   Thickness GetBorderThickness();
@@ -104,5 +105,7 @@ class SdlWindow : public SdlResource, public virtual INativeWindow {
   WindowStyleFlag style_;
   std::string title_;
   std::shared_ptr<ICursor> cursor_;
+
+  std::unique_ptr<SdlInputMethodContext> input_context_;
 };
 }  // namespace cru::platform::gui::sdl
diff --git a/src/platform/gui/sdl/CMakeLists.txt b/src/platform/gui/sdl/CMakeLists.txt
index fac9d859..c01e8bbf 100644
--- a/src/platform/gui/sdl/CMakeLists.txt
+++ b/src/platform/gui/sdl/CMakeLists.txt
@@ -2,6 +2,7 @@ add_library(CruPlatformGuiSdl
 	Base.cpp
 	Cursor.cpp
 	Input.cpp
+	InputMethod.cpp
 	UiApplication.cpp
 	Window.cpp
 )
diff --git a/src/platform/gui/sdl/InputMethod.cpp b/src/platform/gui/sdl/InputMethod.cpp
new file mode 100644
index 00000000..0cd22544
--- /dev/null
+++ b/src/platform/gui/sdl/InputMethod.cpp
@@ -0,0 +1,66 @@
+#include "cru/platform/gui/sdl/InputMethod.h"
+#include "SDL3/SDL_events.h"
+#include "cru/platform/gui/sdl/Base.h"
+#include "cru/platform/gui/sdl/Window.h"
+
+#include <SDL3/SDL_keyboard.h>
+
+namespace cru::platform::gui::sdl {
+SdlInputMethodContext::SdlInputMethodContext(SdlWindow* window)
+    : window_(window) {}
+
+bool SdlInputMethodContext::ShouldManuallyDrawCompositionText() {
+  return false;
+}
+
+void SdlInputMethodContext::EnableIME() {
+  if (auto sdl_window = window_->GetSdlWindow()) {
+    CheckSdlReturn(SDL_StartTextInput(sdl_window));
+  }
+}
+void SdlInputMethodContext::DisableIME() {
+  if (auto sdl_window = window_->GetSdlWindow()) {
+    CheckSdlReturn(SDL_StopTextInput(sdl_window));
+  }
+}
+
+void SdlInputMethodContext::CompleteComposition() { CancelComposition(); }
+
+void SdlInputMethodContext::CancelComposition() {
+  if (auto sdl_window = window_->GetSdlWindow()) {
+    CheckSdlReturn(SDL_ClearComposition(sdl_window));
+  }
+}
+
+CompositionText SdlInputMethodContext::GetCompositionText() { return {}; }
+
+void SdlInputMethodContext::SetCandidateWindowPosition(const Point& point) {
+  if (auto sdl_window = window_->GetSdlWindow()) {
+    SDL_Rect rect{static_cast<int>(point.x), static_cast<int>(point.y), 1, 1};
+    CheckSdlReturn(SDL_SetTextInputArea(sdl_window, &rect, 0));
+  }
+}
+
+namespace {
+std::optional<SDL_WindowID> GetEventWindowId(const SDL_Event& event) {
+  switch (event.type) {
+    case SDL_EVENT_TEXT_INPUT:
+      return event.text.windowID;
+    default:
+      return std::nullopt;
+  }
+}
+}  // namespace
+
+bool SdlInputMethodContext::HandleEvent(const SDL_Event* event) {
+  if (window_->GetSdlWindowId() != GetEventWindowId(*event)) return false;
+
+  if (event->type == SDL_EVENT_TEXT_INPUT) {
+    std::string text(event->text.text);
+    TextEvent_.Raise(text);
+    return true;
+  }
+  return false;
+}
+
+}  // namespace cru::platform::gui::sdl
diff --git a/src/platform/gui/sdl/UiApplication.cpp b/src/platform/gui/sdl/UiApplication.cpp
index d2275a37..6d52b5f7 100644
--- a/src/platform/gui/sdl/UiApplication.cpp
+++ b/src/platform/gui/sdl/UiApplication.cpp
@@ -157,40 +157,10 @@ long long SdlUiApplication::SetTimer(std::chrono::milliseconds milliseconds,
   return timers_.Add(std::move(action), milliseconds, repeat);
 }
 
-namespace {
-std::optional<SDL_WindowID> GetEventWindowId(const SDL_Event& event) {
-  switch (event.type) {
-    case SDL_EVENT_WINDOW_MOVED:
-    case SDL_EVENT_WINDOW_RESIZED:
-    case SDL_EVENT_WINDOW_SHOWN:
-    case SDL_EVENT_WINDOW_HIDDEN:
-    case SDL_EVENT_WINDOW_MINIMIZED:
-    case SDL_EVENT_WINDOW_FOCUS_GAINED:
-    case SDL_EVENT_WINDOW_FOCUS_LOST:
-    case SDL_EVENT_WINDOW_MOUSE_ENTER:
-    case SDL_EVENT_WINDOW_MOUSE_LEAVE:
-    case SDL_EVENT_WINDOW_DESTROYED:
-      return event.window.windowID;
-    case SDL_EVENT_MOUSE_BUTTON_DOWN:
-    case SDL_EVENT_MOUSE_BUTTON_UP:
-      return event.button.windowID;
-    case SDL_EVENT_MOUSE_WHEEL:
-      return event.wheel.windowID;
-    case SDL_EVENT_KEY_DOWN:
-    case SDL_EVENT_KEY_UP:
-      return event.key.windowID;
-    default:
-      return std::nullopt;
-  }
-}
-}  // namespace
-
 bool SdlUiApplication::DispatchEvent(const SDL_Event& event) {
-  if (auto window_id = GetEventWindowId(event)) {
-    for (auto window : windows_) {
-      if (window->sdl_window_id_ == *window_id && window->HandleEvent(&event)) {
-        return true;
-      }
+  for (auto window : windows_) {
+    if (window->HandleEvent(&event)) {
+      return true;
     }
   }
   return false;
diff --git a/src/platform/gui/sdl/Window.cpp b/src/platform/gui/sdl/Window.cpp
index f4b0422e..a4dea5ad 100644
--- a/src/platform/gui/sdl/Window.cpp
+++ b/src/platform/gui/sdl/Window.cpp
@@ -8,6 +8,7 @@
 #include "cru/platform/gui/sdl/Base.h"
 #include "cru/platform/gui/sdl/Cursor.h"
 #include "cru/platform/gui/sdl/Input.h"
+#include "cru/platform/gui/sdl/InputMethod.h"
 #include "cru/platform/gui/sdl/UiApplication.h"
 
 #include <SDL3/SDL_events.h>
@@ -25,6 +26,8 @@ SdlWindow::SdlWindow(SdlUiApplication* application)
       client_rect_(100, 100, 400, 200),
       parent_(nullptr) {
   application->RegisterWindow(this);
+
+  input_context_ = std::make_unique<SdlInputMethodContext>(this);
 }
 
 SdlWindow::~SdlWindow() { application_->UnregisterWindow(this); }
@@ -182,9 +185,13 @@ std::unique_ptr<graphics::IPainter> SdlWindow::BeginPaint() {
   NotImplemented();
 }
 
-IInputMethodContext* SdlWindow::GetInputMethodContext() { NotImplemented(); }
+IInputMethodContext* SdlWindow::GetInputMethodContext() {
+  return input_context_.get();
+}
+
+SDL_Window* SdlWindow::GetSdlWindow() { return sdl_window_; }
 
-std::optional<SDL_Window*> SdlWindow::GetSdlWindow() { return sdl_window_; }
+SDL_WindowID SdlWindow::GetSdlWindowId() { return sdl_window_id_; }
 
 SdlUiApplication* SdlWindow::GetSdlUiApplication() { return application_; }
 
@@ -280,9 +287,39 @@ NativeMouseButtonEventArgs ConvertMouseButtonEvent(
 NativeKeyEventArgs ConvertKeyEvent(const SDL_KeyboardEvent& event) {
   return {ConvertKeyScanCode(event.scancode), ConvertKeyModifier(event.mod)};
 }
+
+std::optional<SDL_WindowID> GetEventWindowId(const SDL_Event& event) {
+  switch (event.type) {
+    case SDL_EVENT_WINDOW_MOVED:
+    case SDL_EVENT_WINDOW_RESIZED:
+    case SDL_EVENT_WINDOW_SHOWN:
+    case SDL_EVENT_WINDOW_HIDDEN:
+    case SDL_EVENT_WINDOW_MINIMIZED:
+    case SDL_EVENT_WINDOW_FOCUS_GAINED:
+    case SDL_EVENT_WINDOW_FOCUS_LOST:
+    case SDL_EVENT_WINDOW_MOUSE_ENTER:
+    case SDL_EVENT_WINDOW_MOUSE_LEAVE:
+    case SDL_EVENT_WINDOW_DESTROYED:
+      return event.window.windowID;
+    case SDL_EVENT_MOUSE_BUTTON_DOWN:
+    case SDL_EVENT_MOUSE_BUTTON_UP:
+      return event.button.windowID;
+    case SDL_EVENT_MOUSE_WHEEL:
+      return event.wheel.windowID;
+    case SDL_EVENT_KEY_DOWN:
+    case SDL_EVENT_KEY_UP:
+      return event.key.windowID;
+    default:
+      return std::nullopt;
+  }
+}
 }  // namespace
 
 bool SdlWindow::HandleEvent(const SDL_Event* event) {
+  if (input_context_->HandleEvent(event)) return true;
+
+  if (sdl_window_id_ != GetEventWindowId(*event)) return false;
+
   switch (event->type) {
     case SDL_EVENT_WINDOW_MOVED: {
       client_rect_.left = event->window.data1;