Event.h

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#pragma once
 
#include <windows.h>
 
namespace z8 {
 
enum class EventReply {
  Ignored, // 未处理
  Handled, // 已处理
  Capture  // 捕获
};
 
enum class MouseButton { None, Left, Middle, Right, X1, X2 };
 
enum class MouseCursor {
  Arrow,
  SizeHorizontal,
  SizeVertical,
  SizeDiagonalNorthwestSoutheast,
  SizeDiagonalNortheastSouthwest
};
 
struct MouseMovArgs {
  unsigned State = 0;
  int X = 0;
  int Y = 0;
  int DeltaX = 0;
  int DeltaY = 0;
  MouseButton Button = MouseButton::None;
 
  MouseMovArgs() = default;
  MouseMovArgs(WPARAM wParam, LPARAM lParam, int deltaX = 0, int deltaY = 0,
               MouseButton button = MouseButton::None);
};
 
struct MouseWheelArgs {
  unsigned State = 0;
  int X = 0;
  int Y = 0;
  int Delta = 0;
};
 
struct KeyArgs {
  unsigned Key = 0;
  unsigned RepeatCount = 0;
  unsigned ScanCode = 0;
  bool IsExtended = false;
  bool WasDown = false;
 
  explicit KeyArgs(WPARAM wParam, LPARAM lParam = 0);
};
 
class EventTarget {
public:
  virtual ~EventTarget() = default;
  virtual EventReply OnMouseDown(MouseMovArgs) { return EventReply::Ignored; }
  virtual EventReply OnMouseMove(MouseMovArgs) { return EventReply::Ignored; }
  virtual EventReply OnMouseDrag(MouseMovArgs) { return EventReply::Ignored; }
  virtual EventReply OnMouseUp(MouseMovArgs) { return EventReply::Ignored; }
  virtual EventReply OnMouseWheel(MouseWheelArgs) { return EventReply::Ignored; }
  virtual EventReply OnKeyDown(KeyArgs) { return EventReply::Ignored; }
  virtual EventReply OnKeyUp(KeyArgs) { return EventReply::Ignored; }
  virtual EventReply OnTextInput(wchar_t) { return EventReply::Ignored; }
  virtual MouseCursor GetMouseCursor(MouseMovArgs) const {
    return MouseCursor::Arrow;
  }
  virtual void OnPointerCaptureLost() {}
};
 
} // namespace z8