IBehavior.h

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#pragma once
 
#include "Core/Event.h"
#include "UI/Property/IProperty.h"
 
namespace z8::ui {
 
class BaseNode;
class BehaviorNode;
 
class IBehavior : public IProperty, public EventTarget {
public:
  BehaviorNode *Owner = nullptr;
  int Priority = 0;
 
  explicit IBehavior(int priority = 0) : Priority(priority) {}
  ~IBehavior() override = default;
  IBehavior(const IBehavior &) = delete;
  IBehavior &operator=(const IBehavior &) = delete;
 
  // 布局计算前更新容器约束；仅布局类 Behavior 应覆写该阶段。
  virtual void OnBeforeLayout(float, float) {}
  virtual void OnAfterLayout() {}
 
  // 观察同一宿主上的有效拖拽生命周期，用于停靠等正交策略。
  virtual void OnDragStarted(MouseMovArgs) {}
  virtual void OnDragCompleted(MouseMovArgs) {}
  virtual void OnAttached() {}
  virtual void OnDetached() {}
};
 
} // namespace z8::ui