Re: How to deactivate an app
Re: How to deactivate an app
- Subject: Re: How to deactivate an app
- From: Ken Thomases <email@hidden>
- Date: Tue, 31 Jan 2012 04:18:51 -0600
On Jan 31, 2012, at 1:55 AM, Gerriet M. Denkmann wrote:
> I have an app A, where I can select a word and press a button.
> This starts (or activates) another app called B, which displays some information about this word.
> But if there is no information about the word, app B should make app A active again.
> But how?
> (B should not be hidden; it should remain visible, so that the user sees: "Word not found".)
> There probably is a simple, direct and obvious solution. But I cannot see it.
There isn't, as far as I know. The best general-purpose solution I'm aware of is for app B to track activations of other apps using Carbon events (kEventClassApplication , kEventAppFrontSwitched). Then, use that info to switch back to the last activate app.
I suppose, these days, you can also key-value observe the runningApplications property of [NSWorkspace sharedWorkspace] to learn when apps come and go, and then key-value observe the active property of all of the NSRunningApplication objects in that collection to track which was last active. That doesn't seem like much of an improvement over the Carbon events approach, though.
However, your case seems more specific. Are both apps A and B ones that you're writing? Can't you just switch back to app A directly, if it's the only thing that will be invoking app B? Or have I misunderstood your case (in which case, maybe you could clarify).
Regards,
Ken
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