com.adobe.csxs.events list

As of 2017 I also need to catch the close panel event to make same safety checks on the document right before the extension is unloaded.

I hope the event "com.adobe.csxs.events.ExtensionUnloaded" is going to work some day on panels, because it seems to be predestined for the purpose. But I found a workaround so far which is tested on Photoshop CC 2017 / MacOS, CSXS v. 7.0

You can use "com.adobe.csxs.events.WindowVisibilityChanged". It just fires on persistent panels in my attempts. Here's the main.js to test panel visibility (opening/closing the panel) and ExtensionUnloaded (doesn't fire at all):

(function() {
    'use strict';
    var fs = require('fs');
    var csInterface = new CSInterface();
    var gExtensionId = "YOUR_EXTENSION.extension";
   // activate persistence
    var persistence = new CSEvent("com.adobe.PhotoshopPersistent", "APPLICATION");
    persistence.extensionId = gExtensionId;
    csInterface.dispatchEvent(persistence);
    console.log('panel window events:');
    /* activate document event: working on both persistent and non-persistent panels */
    new csInterface.addEventListener("documentAfterActivate", function(event) {
        console.log('activated doc: ' + event.data);
    })
    /* collapse/open panel: just working on persistent panels */
    new csInterface.addEventListener("com.adobe.csxs.events.WindowVisibilityChanged", function(event) {
        console.log('window visibility: ' + event.data);
        fs.writeFile("/Users/OSX_USERNAME/Desktop/visibilitychanged.txt", 'visibility changed', function(err) {
            if (err) { console.log(err); }
        });
    });
    /* unload panel: not working at all on panels */
    new csInterface.addEventListener("com.adobe.csxs.events.ExtensionUnloaded", function(event) {
        console.log('extension unloaded: ' + event.data);
        fs.writeFile("/Users/OSX_USERNAME/Desktop/unloaded.txt", 'extension is unloaded', function(err) {
            if (err) { console.log(err); }
        });
    });
}());

If you want your panel to be non-persistent here's a workaround, which is not a beauty but it works.

Just set the "PhotoshopUnPersistent" flag when collapsing the persistent panel:

  /* workaround for "ExtensionUnloaded" by toggling persistence */
    new csInterface.addEventListener("com.adobe.csxs.events.WindowVisibilityChanged", function(event) {
        console.log('window visibility: ' + event.data);
        fs.writeFile("/Users/OSX_USERNAME/Desktop/visibilitychanged.txt", 'visibility changed', function(err) {
            if (err) { console.log(err); }
        });
        var unPersistence = new CSEvent("com.adobe.PhotoshopUnPersistent", "APPLICATION");
        unPersistence.extensionId = gExtensionId;
        csInterface.dispatchEvent(unPersistence);
    });

(remember to adjust the extension name and path on writeFile - but logging suffices)

The workaround assumes that the panel is set to persistent on start. I could verify that persistence actually switches with some status flags in the html/js file.

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related links:

a (closed) Github issue on "ExtensionUnloaded" - hope it will come to panel extensions, too:

ModalDialog: how to hide the close button or get unload event · Issue #77 · Adobe-CEP/CEP-Resources · GitHub

Re: What event type is fired when the panel is collapsed ?

com.adobe.csxs.events list