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1 files changed, 137 insertions, 0 deletions

diff --git a/include/cru/ui/control.hpp b/include/cru/ui/control.hpp
new file mode 100644
index 00000000..684af2f0
--- /dev/null
+++ b/include/cru/ui/control.hpp
@@ -0,0 +1,137 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include "cru/platform/basic_types.hpp"
+#include "event/ui_event.hpp"
+
+#include <string_view>
+#include <vector>
+
+namespace cru::ui {
+class Window;
+namespace render {
+class RenderObject;
+}  // namespace render
+
+class Control : public Object {
+  friend class Window;
+
+ protected:
+  Control() = default;
+
+ public:
+  Control(const Control& other) = delete;
+  Control(Control&& other) = delete;
+  Control& operator=(const Control& other) = delete;
+  Control& operator=(Control&& other) = delete;
+  ~Control() override = default;
+
+ public:
+  virtual std::wstring_view GetControlType() const = 0;
+
+  //*************** region: tree ***************
+ public:
+  // Get the window if attached, otherwise, return nullptr.
+  Window* GetWindow() const { return window_; }
+
+  Control* GetParent() const { return parent_; }
+
+  virtual const std::vector<Control*>& GetChildren() const = 0;
+
+  // Traverse the tree rooted the control including itself.
+  void TraverseDescendants(const std::function<void(Control*)>& predicate);
+
+  void _SetParent(Control* parent);
+  void _SetDescendantWindow(Window* window);
+
+ private:
+  static void _TraverseDescendants(
+      Control* control, const std::function<void(Control*)>& predicate);
+
+ public:
+  virtual render::RenderObject* GetRenderObject() const = 0;
+
+  //*************** region: focus ***************
+ public:
+  bool RequestFocus();
+
+  bool HasFocus();
+
+  //*************** region: events ***************
+ public:
+  // Raised when mouse enter the control.
+  event::RoutedEvent<event::MouseEventArgs>* MouseEnterEvent() {
+    return &mouse_enter_event_;
+  }
+  // Raised when mouse is leave the control.
+  event::RoutedEvent<event::MouseEventArgs>* MouseLeaveEvent() {
+    return &mouse_leave_event_;
+  }
+  // Raised when mouse is move in the control.
+  event::RoutedEvent<event::MouseEventArgs>* MouseMoveEvent() {
+    return &mouse_move_event_;
+  }
+  // Raised when a mouse button is pressed in the control.
+  event::RoutedEvent<event::MouseButtonEventArgs>* MouseDownEvent() {
+    return &mouse_down_event_;
+  }
+  // Raised when a mouse button is released in the control.
+  event::RoutedEvent<event::MouseButtonEventArgs>* MouseUpEvent() {
+    return &mouse_up_event_;
+  }
+  // Raised when a mouse button is pressed in the control and released in the
+  // control with mouse not leaving it between two operations.
+  event::RoutedEvent<event::MouseButtonEventArgs>* MouseClickEvent() {
+    return &mouse_click_event_;
+  }
+  event::RoutedEvent<event::MouseWheelEventArgs>* MouseWheelEvent() {
+    return &mouse_wheel_event_;
+  }
+  event::RoutedEvent<event::KeyEventArgs>* KeyDownEvent() {
+    return &key_down_event_;
+  }
+  event::RoutedEvent<event::KeyEventArgs>* KeyUpEvent() {
+    return &key_up_event_;
+  }
+  //  event::RoutedEvent<event::CharEventArgs>* CharEvent() {
+  //    return &char_event_;
+  //  }
+  event::RoutedEvent<event::FocusChangeEventArgs>* GainFocusEvent() {
+    return &gain_focus_event_;
+  }
+  event::RoutedEvent<event::FocusChangeEventArgs>* LoseFocusEvent() {
+    return &lose_focus_event_;
+  }
+
+ private:
+  event::RoutedEvent<event::MouseEventArgs> mouse_enter_event_;
+  event::RoutedEvent<event::MouseEventArgs> mouse_leave_event_;
+  event::RoutedEvent<event::MouseEventArgs> mouse_move_event_;
+  event::RoutedEvent<event::MouseButtonEventArgs> mouse_down_event_;
+  event::RoutedEvent<event::MouseButtonEventArgs> mouse_up_event_;
+  event::RoutedEvent<event::MouseButtonEventArgs> mouse_click_event_;
+  event::RoutedEvent<event::MouseWheelEventArgs> mouse_wheel_event_;
+
+  event::RoutedEvent<event::KeyEventArgs> key_down_event_;
+  event::RoutedEvent<event::KeyEventArgs> key_up_event_;
+  //  event::RoutedEvent<event::CharEventArgs> char_event_;
+
+  event::RoutedEvent<event::FocusChangeEventArgs> gain_focus_event_;
+  event::RoutedEvent<event::FocusChangeEventArgs> lose_focus_event_;
+
+  //*************** region: tree ***************
+ protected:
+  virtual void OnParentChanged(Control* old_parent, Control* new_parent);
+  virtual void OnAttachToWindow(Window* window);
+  virtual void OnDetachToWindow(Window* window);
+
+  //*************** region: additional mouse event ***************
+ protected:
+  virtual void OnMouseClickBegin(platform::MouseButton button);
+  virtual void OnMouseClickEnd(platform::MouseButton button);
+
+ private:
+  Window* window_ = nullptr;
+  Control* parent_ = nullptr;
+};
+}  // namespace cru::ui