Method OnDropFiles

Rendering/UI/vtkWin32RenderWindowInteractor.cxx:958–1003

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//------------------------------------------------------------------------------
int vtkWin32RenderWindowInteractor::OnDropFiles(HWND, WPARAM wParam)
{
  if (!this->Enabled)
  {
    return 0;
  }

  HDROP hdrop = reinterpret_cast<HDROP>(wParam);

  POINT pt;
  if (DragQueryPoint(hdrop, &pt))
  {
    double location[2];
    location[0] = static_cast<double>(pt.x);
    location[1] = static_cast<double>(this->Size[1] - pt.y - 1); // flip Y

    int ctrl, shift, alt;
    ::RecoverModifiersStatus(ctrl, shift, alt);
    this->SetEventInformationFlipY(location[0], location[1], ctrl, shift);
    this->SetAltKey(alt);
    this->InvokeEvent(vtkCommand::UpdateDropLocationEvent, location);
  }

  UINT cFiles = DragQueryFileW(hdrop, 0xFFFFFFFF, nullptr, 0);

  int ret = 0;
  if (cFiles > 0)
  {
    vtkNew<vtkStringArray> filePaths;
    filePaths->Allocate(cFiles);

    for (UINT i = 0; i < cFiles; i++)
    {
      wchar_t file[MAX_PATH];
      UINT cch = DragQueryFileW(hdrop, i, file, MAX_PATH);
      if (cch > 0 && cch < MAX_PATH)
      {
        filePaths->InsertNextValue(vtksys::Encoding::ToNarrow(file));
        ret = 1;
      }
    }
    this->InvokeEvent(vtkCommand::DropFilesEvent, filePaths);
  }

  return ret;
}

//------------------------------------------------------------------------------
// This is only called when InstallMessageProc is true