vtkWebAssemblyRenderWindowInteractor.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkWebAssemblyRenderWindowInteractor_h
#define vtkWebAssemblyRenderWindowInteractor_h
 
#ifndef __EMSCRIPTEN__
#error "vtkWebAssemblyRenderWindowInteractor requires the Emscripten SDK"
#endif
 
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderingUIModule.h" // For export macro
#include "vtkWrappingHints.h"     // For VTK_MARSHALAUTO
#include <memory>                 // for shared_ptr
 
VTK_ABI_NAMESPACE_BEGIN
 
class VTKRENDERINGUI_EXPORT VTK_MARSHALAUTO vtkWebAssemblyRenderWindowInteractor
  : public vtkRenderWindowInteractor
{
public:
  static vtkWebAssemblyRenderWindowInteractor* New();
 
  vtkTypeMacro(vtkWebAssemblyRenderWindowInteractor, vtkRenderWindowInteractor);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  void Initialize() override;

  void ProcessEvents() override;

  void TerminateApp() override;

  void ExitCallback() override;

  vtkGetStringMacro(CanvasSelector);
  virtual void SetCanvasSelector(const char* value);

  vtkGetMacro(ExpandCanvasToContainer, bool);
  vtkSetMacro(ExpandCanvasToContainer, bool);
  vtkBooleanMacro(ExpandCanvasToContainer, bool);

  vtkGetMacro(InstallHTMLResizeObserver, bool);
  vtkSetMacro(InstallHTMLResizeObserver, bool);
  vtkBooleanMacro(InstallHTMLResizeObserver, bool);
 
protected:
  vtkWebAssemblyRenderWindowInteractor();
  ~vtkWebAssemblyRenderWindowInteractor() override;


  void RegisterUICallbacks();
  void UnRegisterUICallbacks();
 
  void ProcessEvent(int type, const std::uint8_t* event);


  int InternalCreateTimer(int timerId, int timerType, unsigned long duration) override;
  int InternalDestroyTimer(int platformTimerId) override;

  void StartEventLoop() override;
 
  char* CanvasSelector = nullptr;
  bool ExpandCanvasToContainer;
  bool InstallHTMLResizeObserver;
 
private:
  vtkWebAssemblyRenderWindowInteractor(const vtkWebAssemblyRenderWindowInteractor&) = delete;
  void operator=(const vtkWebAssemblyRenderWindowInteractor&) = delete;
 
  friend class vtkInternals;
  class vtkInternals;
  std::shared_ptr<vtkInternals> Internals; // the pointer is also shared with timer's callback data.
};
 
extern "C"
{
  typedef void (*vtkTimerCallbackFunc)(void*);
  typedef bool (*vtkEventProcessingFunc)(void*);
  typedef void (*vtkUnRegisterInteractorFunc)(void*);
 
  int vtkCreateTimer(
    unsigned long duration, bool isOneShot, vtkTimerCallbackFunc callback, void* userData);
  void vtkDestroyTimer(int timerId, bool isOneShot);
  int* vtkGetParentElementBoundingRectSize(const char* selector);
  void vtkInitializeCanvasElement(const char* selector, bool applyStyle);
  void vtkStartEventLoopSync(vtkEventProcessingFunc spinOnceAndGetDone,
    vtkUnRegisterInteractorFunc unRegisterInteractor, void* arg);
  void vtkStartEventLoopAsync(vtkEventProcessingFunc spinOnceAndGetDone,
    vtkUnRegisterInteractorFunc unRegisterInteractor, void* arg);
}
 
VTK_ABI_NAMESPACE_END
#endif