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#pragma once
#include "../Base.h"
#include "../events/UiEvents.h"
#include "../render/RenderObject.h"
#include "../style/StyleRuleSet.h"
namespace cru::ui::controls {
/**
* \remarks If you want to write a new control. You should override following
* methods:
* - GetControlType()
* - GetRenderObject()
* - ForEachChild(const std::function<void(Control*)>& predicate)
* - RemoveChild(Control* child)
* The last two methods are totally for convenient control tree management. The
* former one is even not used.
*/
class CRU_UI_API Control : public Object {
friend class RootControl;
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;
public:
virtual String GetControlType() const = 0;
//*************** region: tree ***************
public:
host::WindowHost* GetWindowHost() const { return window_host_; }
Control* GetParent() const { return parent_; }
void SetParent(Control* parent);
virtual void ForEachChild(const std::function<void(Control*)>& predicate) = 0;
/**
* \remarks This method should be permissive, which means if the specified
* child control is not a real child of this then nothing will be done.
*/
virtual void RemoveChild(Control* child) = 0;
void RemoveFromParent();
public:
virtual render::RenderObject* GetRenderObject() const = 0;
//*************** region: focus ***************
public:
bool HasFocus();
void SetFocus();
//*************** 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::gui::ICursor> GetCursor();
// will not return nullptr
std::shared_ptr<platform::gui::ICursor> GetInheritedCursor();
// null to unset
void SetCursor(std::shared_ptr<platform::gui::ICursor> cursor);
public:
std::shared_ptr<style::StyleRuleSet> GetStyleRuleSet();
//*************** 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.
events::RoutedEvent<events::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.
events::RoutedEvent<events::MouseEventArgs>* MouseLeaveEvent() {
return &mouse_leave_event_;
}
// Raised when mouse is move in the control.
events::RoutedEvent<events::MouseEventArgs>* MouseMoveEvent() {
return &mouse_move_event_;
}
// Raised when a mouse button is pressed in the control.
events::RoutedEvent<events::MouseButtonEventArgs>* MouseDownEvent() {
return &mouse_down_event_;
}
// Raised when a mouse button is released in the control.
events::RoutedEvent<events::MouseButtonEventArgs>* MouseUpEvent() {
return &mouse_up_event_;
}
events::RoutedEvent<events::MouseWheelEventArgs>* MouseWheelEvent() {
return &mouse_wheel_event_;
}
events::RoutedEvent<events::KeyEventArgs>* KeyDownEvent() {
return &key_down_event_;
}
events::RoutedEvent<events::KeyEventArgs>* KeyUpEvent() {
return &key_up_event_;
}
events::RoutedEvent<events::FocusChangeEventArgs>* GainFocusEvent() {
return &gain_focus_event_;
}
events::RoutedEvent<events::FocusChangeEventArgs>* LoseFocusEvent() {
return &lose_focus_event_;
}
private:
events::RoutedEvent<events::MouseEventArgs> mouse_enter_event_;
events::RoutedEvent<events::MouseEventArgs> mouse_leave_event_;
events::RoutedEvent<events::MouseEventArgs> mouse_move_event_;
events::RoutedEvent<events::MouseButtonEventArgs> mouse_down_event_;
events::RoutedEvent<events::MouseButtonEventArgs> mouse_up_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::FocusChangeEventArgs> gain_focus_event_;
events::RoutedEvent<events::FocusChangeEventArgs> lose_focus_event_;
//*************** region: tree ***************
protected:
virtual void OnParentChanged(Control* old_parent, Control* new_parent) {}
virtual void OnWindowHostChanged(host::WindowHost* old_host,
host::WindowHost* new_host) {}
protected:
virtual void OnMouseHoverChange(bool newHover) { CRU_UNUSED(newHover) }
private:
void OnParentChangedCore(Control* old_parent, Control* new_parent);
void OnWindowHostChangedCore(host::WindowHost* old_host,
host::WindowHost* new_host);
private:
bool in_destruction_ = false;
Control* parent_ = nullptr;
host::WindowHost* window_host_ = nullptr;
private:
bool is_mouse_over_ = false;
std::shared_ptr<platform::gui::ICursor> cursor_ = nullptr;
std::shared_ptr<style::StyleRuleSet> style_rule_set_;
std::unique_ptr<style::StyleRuleSetBind> style_rule_set_bind_;
};
} // namespace cru::ui::controls
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