Impl input method for xim.

1 files changed, 77 insertions, 0 deletions

diff --git a/include/cru/platform/gui/xcb/InputMethod.h b/include/cru/platform/gui/xcb/InputMethod.h
new file mode 100644
index 00000000..286f3158
--- /dev/null
+++ b/include/cru/platform/gui/xcb/InputMethod.h
@@ -0,0 +1,77 @@
+#pragma once
+
+#include "../InputMethod.h"
+#include "Base.h"
+
+#include <xcb-imdkit/imclient.h>
+#include <xcb/xcb.h>
+#include <optional>
+
+namespace cru::platform::gui::xcb {
+class XcbUiApplication;
+class XcbWindow;
+
+class XcbXimInputMethodManager : public XcbResource {
+  friend XcbUiApplication;
+
+ public:
+  XcbXimInputMethodManager(XcbUiApplication* application);
+  ~XcbXimInputMethodManager() override;
+
+  xcb_xim_t* GetXcbXim();
+
+ private:
+  void DispatchCommit(xcb_xim_t* im, xcb_xic_t ic, std::string text);
+  void DispatchComposition(xcb_xim_t* im, xcb_xic_t ic, CompositionText text);
+
+  bool HandleXEvent(xcb_generic_event_t* event);
+
+ private:
+  XcbUiApplication* application_;
+  xcb_xim_t* im_;
+};
+
+class XcbXimInputMethodContext : public XcbResource,
+                                 public virtual IInputMethodContext {
+  friend XcbXimInputMethodManager;
+
+ public:
+  XcbXimInputMethodContext(XcbXimInputMethodManager* manager,
+                           XcbWindow* window);
+  ~XcbXimInputMethodContext() override;
+
+  bool ShouldManuallyDrawCompositionText() override;
+
+  void EnableIME() override;
+  void DisableIME() override;
+
+  void CompleteComposition() override;
+  void CancelComposition() override;
+  CompositionText GetCompositionText() override;
+
+  // Set the candidate window left-top. Relative to window left-top. Use this
+  // method to prepare typing.
+  void SetCandidateWindowPosition(const Point& point) override;
+
+  IEvent<std::nullptr_t>* CompositionStartEvent() override;
+  IEvent<std::nullptr_t>* CompositionEndEvent() override;
+  IEvent<std::nullptr_t>* CompositionEvent() override;
+  IEvent<StringView>* TextEvent() override;
+
+ private:
+  void CreateIc(xcb_window_t window);
+  void DestroyIc();
+
+ private:
+  XcbXimInputMethodManager* manager_;
+  XcbWindow* window_;
+  bool enabled_;
+  std::optional<xcb_xic_t> ic_;
+  CompositionText composition_text_;
+
+  Event<std::nullptr_t> composition_start_event_;
+  Event<std::nullptr_t> composition_end_event_;
+  Event<std::nullptr_t> composition_event_;
+  Event<StringView> text_event_;
+};
+}  // namespace cru::platform::gui::xcb