function MakeWidescreenPlugin(pluginsman) {
  var funcThis = this

  if (pluginsman.docType !== 'pptx' && pluginsman.docType !== 'ppsx') {
    throw new Error(
      '[pptx-widescreen] This plugin supporting only PowerPoint based documents.'
    )
  } // Endif.

  this.pluginsman = pluginsman
  this.pptxData = pluginsman.getDataStorage()

  // We want to extend the main API of the pptx document object:
  pluginsman.registerCallback('makeDocApi', function (docObj) {
    funcThis.extendPptxApi(docObj)
  })

  return this
}
This function creating the wide screen plugin object.
@param {object} pluginsman Access to the plugins manager for pptx documents.
@constructor
@name MakeWidescreenPlugin