Re: shouldSelectTabViewItem called twice
Re: shouldSelectTabViewItem called twice
- Subject: Re: shouldSelectTabViewItem called twice
- From: Frode <email@hidden>
- Date: Tue, 27 Jun 2006 11:13:38 +0200
Part 3 of 3
8. Quit Interface Builder and go to XCode. Paste this source code in
MyDocument.h
NSButton *checkbox1;
NSWindow *mainWindow;
NSButton *previousButton, *nextButton;
9. Paste this source code in MyDocument.m
- (void)tabView:(NSTabView *)tabView willSelectTabViewItem:
(NSTabViewItem *)tabViewItem {
NSLog (@"%s:%@", __func__, [tabViewItem identifier]);
int idx = [tabView indexOfTabViewItem:tabViewItem];
[previousButton setEnabled:idx != 0];
[nextButton setEnabled:idx != [tabView numberOfTabViewItems] - 1];
}
- (void)tabView:(NSTabView *)inTabView didSelectTabViewItem:
(NSTabViewItem *)tabViewItem {
NSLog (@"%s:%@", __func__, [tabViewItem identifier]);
}
- (BOOL)tabView:(NSTabView *)inTabView shouldSelectTabViewItem:
(NSTabViewItem *)tabViewItem {
NSLog (@"%s:%@", __func__, [tabViewItem identifier]);
switch ([[[inTabView selectedTabViewItem] identifier] intValue]) {
case 1:
if ([checkbox1 state] > 0) {
NSBeginAlertSheet(@"Page locked",
@"OK", nil, nil, mainWindow, nil, nil,
NULL, NULL, @"Uncheck to switch page", nil);
return NO;
}
return YES;
default:
return YES;
}
return YES;
}
10. Compile, run and read the log. Test first switching pages by the
next and previous button. The shouldSelectTabViewItem is called
twice. Then, switch pages by the tab-view buttons named "tab" and
"view" and notice shouldSelectTabViewItem is called only once.
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