Re: Launched window not activating
Re: Launched window not activating
- Subject: Re: Launched window not activating
- From: Charilaos Skiadas <email@hidden>
- Date: Mon, 11 Apr 2005 21:13:06 -0500
Ken,
Where from are the cameraNotifications posted? 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. 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. 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
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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