Re: Keyboard short-cuts edit field
Re: Keyboard short-cuts edit field
- Subject: Re: Keyboard short-cuts edit field
- From: j o a r <email@hidden>
- Date: Wed, 3 May 2006 21:30:35 +0200
On 3 maj 2006, at 19.08, Eric Long wrote:
I don't know how to intercept the key events for an NSTextField,
which seems
like the best way to do things here, so I opted to watch for
textDidBeginEditing and textDidEndEditing calls. In
textDidBeginEditing, I
set a timer to repeatedly call GetKeys() and set the string value
of the
edit field accordingly. In textDidEndEditing I invalidate the timer.
<snip>
Is there a better way to do this? If so, can you explain it to me?
If I'm on the right track, how can I alleviate the problem of the
beeps and
such?
Personally, I would never use timers like that. You get events for
every new character, so why use a timer? Use delayed actions only
when you absolutely have to.
I implemented a control to grab user keyboard shortcut once. The
capture of the key events was in my case done by a subclass to
NSBrowser (as the browser was used to represent the tree of available
menu items), and done something like this:
- (BOOL) performKeyEquivalent:(NSEvent *) event
{
NSString *keyEquiv = [event charactersIgnoringModifiers];
unsigned int eventFlags = ([self modifierFlags] &
NSDeviceIndependentModifierFlagsMask);
/*
NSLog(@"keyEvent: %@", aKeyEquiv);
NSLog(@"characters: %@", [event characters]);
NSLog(@"charactersIgnoringModifiers: %@", keyEquiv);
NSLog(@"deviceIndependentModifierFlags: %d", eventFlags);
NSLog(@"NSControlKeyMask: %d, %d", ((eventFlags &
NSControlKeyMask) != 0), NSControlKeyMask);
NSLog(@"NSAlternateKeyMask: %d, %d", ((eventFlags &
NSAlternateKeyMask) != 0), NSAlternateKeyMask);
NSLog(@"NSShiftKeyMask: %d, %d", ((eventFlags & NSShiftKeyMask) !=
0), NSShiftKeyMask);
NSLog(@"NSAlphaShiftKeyMask: %d, %d", ((eventFlags &
NSAlphaShiftKeyMask) != 0), NSAlphaShiftKeyMask);
NSLog(@"NSCommandKeyMask: %d, %d", ((eventFlags &
NSCommandKeyMask) != 0), NSCommandKeyMask);
*/
}
I use a class to represent a keyboard equivalent:
MyKeyEquivalent *keyEquiv = [MyKeyEquivalent
keyEquivalentWithString: keyEquiv modifierMask: eventFlags];
This class is used to store & restore the set of key equivalents that
the user has specified.
It also has a method to return a string representation when you need
to display it:
- (NSString *) stringRepresentation;
Special characters are created using their unicode values. For
example, to represent the CMD key I create a string like this:
unichar tm[1] = {0x2318};
NSString *cmdKeyStr = [NSString stringWithCharacters: tm length: 1];
j o a r
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