Win32WindowHost.h

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#pragma once
 
#include "Core/Event.h"
 
#include <windows.h>
 
namespace z8 {
 
class Win32WindowHost {
private:
  EventTarget *InputTarget = nullptr;
  HWND AttachedWindow = nullptr;
  HWND InputCoordinateWindow = nullptr;
  POINT LastPointer{};
  bool HasPointerPosition = false;
  bool ReleasingCapture = false;
 
  static MouseButton ResolveMouseButton(UINT message, WPARAM wParam);
  float ResolveCoordinateScale() const;
  MouseMovArgs ResolveMouseArgs(HWND sourceWindow, UINT message,
                                WPARAM wParam, LPARAM lParam);
  static LPCWSTR ResolveSystemCursor(MouseCursor cursor);
  static LRESULT CALLBACK WindowProcedure(HWND window, UINT message,
                                          WPARAM wParam, LPARAM lParam);
 
protected:
  Win32WindowHost() = default;
  virtual ~Win32WindowHost();
 
  void AttachWindow(HWND window, EventTarget &inputTarget,
                    HWND coordinateWindow = nullptr);
  void DetachWindow();
  bool DispatchInputMessage(HWND window, UINT message, WPARAM wParam,
                            LPARAM lParam, LRESULT &result);
  virtual LRESULT HandleWindowMessage(HWND window, UINT message,
                                      WPARAM wParam, LPARAM lParam) = 0;
};
 
} // namespace z8