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#pragma once
#include "pre.hpp"
#include "system_headers.hpp"
#include "base.hpp"
#include "cursor.hpp"
#include "events/ui_event.hpp"
#include "input_util.hpp"
#include "ui_base.hpp"
namespace cru::ui {
class Window;
namespace render {
class RenderObject;
}
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 StringView 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: cursor ***************
// If cursor is set to null, then it uses parent's cursor.
// Window's cursor can't be null.
public:
Cursor::Ptr GetCursor() const { return cursor_; }
void SetCursor(const Cursor::Ptr& cursor);
//*************** region: events ***************
public:
// Raised when mouse enter the control.
events::RoutedEvent<events::MouseEventArgs> mouse_enter_event;
// Raised when mouse is leave the control.
events::RoutedEvent<events::MouseEventArgs> mouse_leave_event;
// Raised when mouse is move in the control.
events::RoutedEvent<events::MouseEventArgs> mouse_move_event;
// Raised when a mouse button is pressed in the control.
events::RoutedEvent<events::MouseButtonEventArgs> mouse_down_event;
// Raised when a mouse button is released in the control.
events::RoutedEvent<events::MouseButtonEventArgs> 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.
events::RoutedEvent<events::MouseButtonEventArgs> mouse_click_event;
events::RoutedEvent<events::MouseWheelEventArgs> mouse_wheel_event;
events::RoutedEvent<events::KeyEventArgs> key_down_event;
events::RoutedEvent<events::KeyEventArgs> key_up_event;
events::RoutedEvent<events::CharEventArgs> char_event;
events::RoutedEvent<events::FocusChangeEventArgs> get_focus_event;
events::RoutedEvent<events::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(MouseButton button);
virtual void OnMouseClickEnd(MouseButton button);
private:
Window* window_ = nullptr;
Control* parent_ = nullptr;
Cursor::Ptr cursor_{};
};
} // namespace cru::ui
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