Re: Launched window not activating
Re: Launched window not activating
- Subject: Re: Launched window not activating
- From: Ken Tozier <email@hidden>
- Date: Tue, 12 Apr 2005 00:32:38 -0400
On Apr 11, 2005, at 10:13 PM, Charilaos Skiadas wrote:
Ken,
Where from are the cameraNotifications posted?
They come from the ICA (image capture) interface (not my app) so I don't really know what's happening under the hood.
The method handling them will be running in that same thread that they were posted on, regardless of in which thread you registered for the notification, so the downloader methods dealing with the notifications might actually not be running in the main thread.
I just did a test in the callback handler checking to see if I was multithreaded but it doesn't appear that the ICA stuff is forking a new thread for messages it delivers. I was still single threaded inside the callback.
In that case, your downloader should be using performSelectorOnMainThread: for the creation of the window and bringing it to front, to make sure these operations take place in the main thread.
OK I tried performSelectorOnMainThread and got basically the same result. The window appears in unactivated form and sending it a "makeKeyAndOrderFront" from within performSelectorOnMainThread doesn't do anything. You can click on it and move it around the screen but it never comes to the front.
In any case it's a good idea to give it a try this way, and ensure that all the UI stuff happens in the main thread.
This might talk a bit more about the issue:
http://cocoa.mamasam.com/MACOSXDEV/2004/02/2/85391.php
Thanks for the link.
Ken
HTH
On Apr 11, 2005, at 8:51 PM, Ken Tozier wrote:
Sorry to keep beating this issue, but there is something fundamentally wrong somewhere in the following six steps and I'm just not experienced enough with Cocoa GUI stuff to see it. To me, the algorithm looks fine, but there is some subtle thing that Cocoa doesn't like.
The problem is that the window generated in step 6.A and displayed in 6.B is never frontmost and can't even be forced to front by clicking on it. The only way to bring it to front is to put the window load code inside a thread (which I'm told is bad for GUI stuff) Even when it's placed in a thread, it doesn't become frontmost without manually clicking on it.
Anyone see the error?
Thanks
Ken
Sequence of events:
--------------------------------
1. Application opens "main" nib
2. "AppController" instance inside "main" nib initializes it's "downloader" instance
- (id) init
{
self = [super init];
if (self)
{
downloader = [[ICADownloader alloc] init];
}
return self;
}
3. Downloader instance registers for camera connect events in it's "init" method
- (id) init
{
self = [super init];
if (self)
{
[self registerForCameraConnectNotifications];
}
return self;
}
4. Time passes
5. User plugs in a camera
6. Downloader receives camera connect notification and performs following actions:
A. Creates a new window by loading the "DownloadWindow" nib file using NSWindowController with an owner of "self".
B. Displays the window.
C. Downloads photos to a specified directory.
D. Closes window.
7. Done/Waits for another camera connect event.
Hierarchically, the location of the window create code is
App
{
Main Nib
{
AppController
{
downloader
{
handleCameraConnect <- (callback method)
{
NSWindowController *wind
}
}
}
}
}
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Haris
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