1 files changed, 141 insertions, 0 deletions
diff --git a/include/cru/ui/controls/TextHostControlService.hpp b/include/cru/ui/controls/TextHostControlService.hpp
new file mode 100644
index 00000000..0bea52c8
--- /dev/null
+++ b/include/cru/ui/controls/TextHostControlService.hpp
@@ -0,0 +1,141 @@
+#pragma once
+#include "Base.hpp"
+
+#include "cru/platform/gui/InputMethod.hpp"
+#include "cru/platform/gui/UiApplication.hpp"
+#include "cru/ui/controls/Control.hpp"
+#include "cru/ui/helper/ShortcutHub.hpp"
+
+#include <functional>
+#include <string>
+
+namespace cru::ui::render {
+class TextRenderObject;
+class ScrollRenderObject;
+}  // namespace cru::ui::render
+
+namespace cru::ui::controls {
+constexpr int k_default_caret_blink_duration = 500;
+
+struct ITextHostControl : virtual Interface {
+  virtual gsl::not_null<render::TextRenderObject*> GetTextRenderObject() = 0;
+  // May return nullptr.
+  virtual render::ScrollRenderObject* GetScrollRenderObject() = 0;
+};
+
+class TextHostControlService : public Object {
+  CRU_DEFINE_CLASS_LOG_TAG(u"cru::ui::controls::TextControlService")
+
+ public:
+  TextHostControlService(gsl::not_null<Control*> control);
+
+  CRU_DELETE_COPY(TextHostControlService)
+  CRU_DELETE_MOVE(TextHostControlService)
+
+  ~TextHostControlService() = default;
+
+ public:
+  bool IsEnabled() { return enable_; }
+  void SetEnabled(bool enable);
+
+  bool IsEditable() { return this->editable_; }
+  void SetEditable(bool editable);
+
+  std::u16string GetText() { return this->text_; }
+  std::u16string_view GetTextView() { return this->text_; }
+  void SetText(std::u16string text, bool stop_composition = false);
+
+  void InsertText(gsl::index position, std::u16string_view text,
+                  bool stop_composition = false);
+  void DeleteChar(gsl::index position, bool stop_composition = false);
+
+  // Return the position of deleted character.
+  gsl::index DeleteCharPrevious(gsl::index position,
+                                bool stop_composition = false);
+  void DeleteText(TextRange range, bool stop_composition = false);
+
+  void CancelComposition();
+
+  std::optional<platform::gui::CompositionText> GetCompositionInfo();
+
+  bool IsCaretVisible() { return caret_visible_; }
+  void SetCaretVisible(bool visible);
+
+  int GetCaretBlinkDuration() { return caret_blink_duration_; }
+  void SetCaretBlinkDuration(int milliseconds);
+
+  gsl::index GetCaretPosition() { return selection_.GetEnd(); }
+  TextRange GetSelection() { return selection_; }
+
+  void SetSelection(gsl::index caret_position);
+  void SetSelection(TextRange selection, bool scroll_to_caret = true);
+
+  void DeleteSelectedText();
+
+  // If some text is selected, then they are deleted first. Then insert text
+  // into caret position.
+  void ReplaceSelectedText(std::u16string_view text);
+
+  void ScrollToCaret();
+
+ private:
+  gsl::not_null<render::TextRenderObject*> GetTextRenderObject();
+  render::ScrollRenderObject* GetScrollRenderObject();
+
+  // May return nullptr.
+  platform::gui::IInputMethodContext* GetInputMethodContext();
+
+  void CoerceSelection();
+
+  void SetupCaret();
+  void TearDownCaret();
+
+  void SyncTextRenderObject();
+
+  void StartSelection(Index start);
+  void UpdateSelection(Index new_end);
+  void AbortSelection();
+
+  void UpdateInputMethodPosition();
+
+  template <typename TArgs>
+  void SetupOneHandler(event::RoutedEvent<TArgs>* (Control::*event)(),
+                       void (TextHostControlService::*handler)(
+                           typename event::RoutedEvent<TArgs>::EventArgs)) {
+    this->event_guard_ += (this->control_->*event)()->Direct()->AddHandler(
+        std::bind(handler, this, std::placeholders::_1));
+  }
+
+  void SetUpHandlers();
+  void TearDownHandlers();
+
+  void MouseMoveHandler(event::MouseEventArgs& args);
+  void MouseDownHandler(event::MouseButtonEventArgs& args);
+  void MouseUpHandler(event::MouseButtonEventArgs& args);
+  void KeyDownHandler(event::KeyEventArgs& args);
+  void GainFocusHandler(event::FocusChangeEventArgs& args);
+  void LoseFocusHandler(event::FocusChangeEventArgs& args);
+
+ private:
+  gsl::not_null<Control*> control_;
+  gsl::not_null<ITextHostControl*> text_host_control_;
+
+  EventRevokerListGuard event_guard_;
+  EventRevokerListGuard input_method_context_event_guard_;
+
+  std::u16string text_;
+  TextRange selection_;
+
+  bool enable_ = false;
+  bool editable_ = false;
+
+  bool caret_visible_ = false;
+  platform::gui::TimerAutoCanceler caret_timer_canceler_;
+  int caret_blink_duration_ = k_default_caret_blink_duration;
+
+  helper::ShortcutHub shortcut_hub_;
+
+  // true if left mouse is down and selecting
+  bool mouse_move_selecting_;
+};
+}  // namespace cru::ui::controls