How do I flip the canvas on my UXP plugin using js?

Question

I am working on my first plugin.  I am also new to js, so admittedly I'm still learning some things.  However, I have every part of my plugin complete but I cannot seem to figure out how I am supposed to flip the canvas.  I just want to write a function that flips the canvas horizontally (or vertically) when called.  What do i call to be able to do this?  I've searched through every available app.document or app.activeDocument option i could find.  Am i missing something?  Rather than a plugin, should i be implementing a script instead or can i integrate both together?

sttk3 · Answer

You need to call batchPlay, because flipCanvas does not seem to exist.

const photoshop = require('photoshop') ;
const { app, core } = photoshop ;
const { batchPlay } = photoshop.action ;

// flip canvas direction
const Direction = {
  'HORIZONTAL': 'horizontal', 
  'VERTICAL': 'vertical'
} ;

/**
  * flip canvas
  *  {Document} doc target document
  *  {String} [direction] flip canvas direction. 'horizontal' if it is undefined
*/
const flipCanvas = async (doc, direction = Direction.HORIZONTAL) => {
  await batchPlay(
    [
      {
        "_obj": "flip",
        "_target": [
          {
            "_ref": "document",
            "_id": doc.id
          }
        ],
        "axis": {
          "_enum": "orientation",
          "_value": direction
        }
      }
    ], 

    {}
  ) ;
} ;

const main = async () => {
  try {
    await core.executeAsModal(
      async (control) => {
        await flipCanvas(app.activeDocument, Direction.HORIZONTAL) ;
      }, 

      {'commandName': 'Flip Canvas'}
    ) ;
  } catch(e) {
    await app.showAlert(e) ;
  }
} ;

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