1 files changed, 152 insertions, 0 deletions
diff --git a/include/cru/ui/Control.hpp b/include/cru/ui/Control.hpp
new file mode 100644
index 00000000..347163be
--- /dev/null
+++ b/include/cru/ui/Control.hpp
@@ -0,0 +1,152 @@
+#pragma once
+#include "Base.hpp"
+
+#include "cru/common/Event.hpp"
+#include "render/Base.hpp"
+#include "UiEvent.hpp"
+
+#include <string_view>
+
+namespace cru::ui {
+class Control : public Object {
+  friend UiHost;
+
+ protected:
+  Control();
+
+ 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::string_view GetControlType() const = 0;
+
+  //*************** region: tree ***************
+ public:
+  // Get the ui host if attached, otherwise, return nullptr.
+  UiHost* GetUiHost() const { return ui_host_; }
+
+  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 _SetDescendantUiHost(UiHost* host);
+
+ 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: mouse ***************
+ public:
+  bool IsMouseOver() const { return is_mouse_over_; }
+
+  bool CaptureMouse();
+
+  bool ReleaseMouse();
+
+  bool IsMouseCaptured();
+
+  //*************** region: cursor ***************
+  // Cursor is inherited from parent recursively if not set.
+ public:
+  // null for not set
+  std::shared_ptr<platform::native::ICursor> GetCursor();
+
+  // will not return nullptr
+  std::shared_ptr<platform::native::ICursor> GetInheritedCursor();
+
+  // null to unset
+  void SetCursor(std::shared_ptr<platform::native::ICursor> cursor);
+
+  //*************** region: events ***************
+ public:
+  // Raised when mouse enter the control. Even when the control itself captures
+  // the mouse, this event is raised as regular. But if mouse is captured by
+  // another control, the control will not receive any mouse enter event. You
+  // can use `IsMouseCaptured` to get more info.
+  event::RoutedEvent<event::MouseEventArgs>* MouseEnterEvent() {
+    return &mouse_enter_event_;
+  }
+  // Raised when mouse is leave the control. Even when the control itself
+  // captures the mouse, this event is raised as regular. But if mouse is
+  // captured by another control, the control will not receive any mouse leave
+  // event. You can use `IsMouseCaptured` to get more info.
+  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_;
+  }
+  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::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::MouseWheelEventArgs> mouse_wheel_event_;
+
+  event::RoutedEvent<event::KeyEventArgs> key_down_event_;
+  event::RoutedEvent<event::KeyEventArgs> key_up_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 OnAttachToHost(UiHost* host);
+  virtual void OnDetachFromHost(UiHost* host);
+
+  virtual void OnMouseHoverChange(bool newHover) { CRU_UNUSED(newHover) }
+
+ private:
+  UiHost* ui_host_ = nullptr;
+  Control* parent_ = nullptr;
+
+ private:
+  bool is_mouse_over_ = false;
+
+  std::shared_ptr<platform::native::ICursor> cursor_ = nullptr;
+};
+}  // namespace cru::ui