site_archiver@lists.apple.com Delivered-To: pro-apps-dev@lists.apple.com Sergey, Answers inline below:

On May 17, 2020, at 7:09 PM, Sergey via Pro-apps-dev <pro-apps-dev@lists.apple.com> wrote:

Good day pro-apps-dev,

We are in the process of porting our plug-in onto FxPlug 4 (right now we are still on v2.x) and we struggle with making the basic things work via XPC.

Our plug-in has its own custom UI based on Qt which is triggered by a Push Button. I am following the FxSimpleColorCorrector example and have been able to create a custom view (just a regular rectangular NSView with a child NSButton; should you ask, I cannot use addPushButtonWithName for the purpose as its selector is handled in the background thread which is not suitable for UI tasks, its visual representation is not perfect either)

You can always use -performSelectorOnMainThread: or dispatch_async(dispatch_get_main_queue(), …) to do things on the main UI thread.

Now obviously, our custom dialog must be pre-filled with current values of the custom parameters. However the FxParameterRetrievalAPI_v6 seems to be inaccessible in the handler selector of the push button. The _apiManager apiForProtocol returns nil no matter what.

Funny enough, in the FxSimpleColorCorrector example the FxParameterRetrievalAPI_v6 is accessible inside drawRect selector, but not accessible inside mouseDown (which is similar to my situation).

Is there a reason why the interface is inaccessible in some selectors, but accessible in others? Can you suggest any solution/workaround?

In general we have to be careful to keep data exchange between the host and the plug-in to a minimum to keep performance tolerable for users. So rather than allowing all selectors to be used during every plug-in call, we now have to be very selective and find creative ways to cache data on the plug-in, while still being careful to keep it up-to-date. It’s can be difficult to get right sometimes. One option right now would be to cache the data yourself for use later on. Since you get called to generate the custom data, you know every time it gets changed. That said, please file a feedback issue and we’ll look into it. Darrin

Best regards,

Sergey

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