Application.h

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//
// Created by zhou_zhengming on 2026/5/7.
//
 
#pragma once
 
#include "Event.h"
#include "Resource/ResourceManager.h"
#include "Scene.h"
#include "Timer.h"
#include "UI/Layout/Layout.h"
#include "Win32WindowHost.h"
#include "Window.h"
 
namespace z8 {
class Render;
class UIObject;
namespace ui {
class XamlHotReload;
}
class Application : public EventTarget, private Win32WindowHost {
public:
  Window Window;
  std::unique_ptr<Render> Render;
  Timer Timer;
  ResourceManager Resources;
  Scene ActiveScene;
  GameObject *SelectedSceneObject = nullptr;
  ui::Layout Layout;
 
  inline static std::vector<Application *> Apps;
 
  Application();
  ~Application() override;
 
 
  bool EnableXamlHotReload(const std::string &fileName);
  void SelectSceneObject(GameObject *object);
  virtual void Init();
  static int Run();
 
private:
  // 模态尺寸循环属于主交换链策略；通用指针状态由 Win32WindowHost 保存。
  bool InSizeMove = false;
  std::unique_ptr<ui::XamlHotReload> XamlReload;
 
  template <typename Handler> void ForEachObject(Handler &&handler);
  template <typename Handler> void ForEachSceneObject(Handler &&handler);
 
  MouseCursor GetMouseCursor(MouseMovArgs args) const override;
  LRESULT HandleWindowMessage(HWND window, UINT message, WPARAM wParam,
                              LPARAM lParam) override;
  virtual void OnFrame() {}
  virtual void OnLayoutReloaded() {}
  virtual void OnSceneSelectionChanged(GameObject *) {}
  EventReply OnKeyDown(KeyArgs args) override;
  EventReply OnKeyUp(KeyArgs args) override;
  EventReply OnMouseDown(MouseMovArgs args) override;
  EventReply OnMouseDrag(MouseMovArgs args) override;
  EventReply OnMouseMove(MouseMovArgs args) override;
  EventReply OnMouseUp(MouseMovArgs args) override;
  EventReply OnMouseWheel(MouseWheelArgs args) override;
  void OnPointerCaptureLost() override;
  EventReply OnTextInput(wchar_t character) override;
  void ShowFrame() const;
  virtual void BeforeInit() { }
};
} // namespace z8