Graham,
Following your suggestions I tried with [[NSOperationQueue mainQueue]
addOperationWithBlock: to update the textField while processing files....but
with less or more success...
While I put [NSApp
beginSheet:modalForWindow:modalDelegate:didEndSelector:contextInfo: inside
[[NSOperationQueue mainQueue] addOperationWithBlock: the sheet window is not
loaded directly...it displays after some file processing has been done ...
1. First I put the [NSApp
beginSheet:modalForWindow:modalDelegate:didEndSelector:contextInfo: ... before
processing the files
(this consist on reading the ASCII files with initWithContentsOfFile: then
extracting every channel with NSScanner, this can take up to 2-10 seconds
depending on the file size).
First problem:
The sheet with the textField is not displayed directly after the openPanel (to
select the appended files) is closed...
This is as you suggested due to the fact that the sheet's window has not
finished to load...so how do I invoke windowDidLoad for appendFilesSheet
(NSWindowController)...
2. While processing the files the textField is only updated after the whole
process has finished...this is not what I expect...would
be nice to update the textField by showing which file it actually processes etc.
I put again the whole code inside NSOperationQueue mainQueue block:
// Do some basic processing...
// Compare the appended files location name with the original's document file
location and update the sheet's textField
// Some pseudo-code here…
for (int i=0 ; i < numberOfFilesToAppend; i++)
{
NSString *nameOfLocation = [[asciiFilesToAppend objectAtIndex:i]
locationName];
....
....
if [nameOfLocation isEqualToString originalLocationName]
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^(void) {
NSString *stationLocation =
[[NSString alloc] initWithFormat:@"Location of the
instrument location:%@", [asciiFilesToAppend objectAtIndex:i] stationLocation];
[[appendFilesSheet appendTextField]
setStringValue:stationLocation];
[[appendFilesSheet appendTextField] setNeedsDisplay:YES];
[stationLocation release];
}];
}
}
But no luck...the appendTextField is only updated after the whole process has
finished...showing only the last object's name
I'm pretty sure I'm doing something wrong here...so any clarification, or
suggestions is of course greatly appreciated ;-)
Cheers,
Gilles
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