Re: How to catch modal window appearance?
Re: How to catch modal window appearance?
- Subject: Re: How to catch modal window appearance?
- From: Joanna Carter <email@hidden>
- Date: Sat, 27 Mar 2010 14:39:08 +0000
Hi Alexander
> I tried to achieve the next effect: some automatic process should be started on the modal window appearance on screen. A popup panel with progress indicator appears, etc. My idea was not to initiate such process from the calling code (where modal window is called from), but do it asynchronously, as soon as the modal window will appear on the screen.
I'm not sure if you realise how the MVC design pattern works. A window is just a view on data, it has no state or logic at all.
> Of course, I've solved the problem by calling this process from the calling code just before [NSApp runModalForWindow:] call. But it is not pretty correct from the OOP philosophy point of view, at least as I understand it.
Every window is "managed" by a Controller and it is from this Controller that you can run any process you want, as well as creating and showing a window.
There is nothing wrong with calling a process from a controller class; you can set to run in a secondary thread and display a progress indicator.
> What is over my mind is why Apple split main loop and modal loop. I see none of benefits but headaches.. There may be only one modal window at a time, isn't it?
I think you are used to Windows programming. Cocoa modal sheets are modal to the owning form, not the whole app.
Joanna
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Joanna Carter
Carter Consulting
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