NSButton Up/Down Events

[Brad Carter]

I got this to work.  Below is the code I used.  I didn't use a  
subclass like I was originally trying to do.  Thanks for all the  
suggestions you guys sent my way.  It helps a lot in learning this  
stuff.

-Brad

myPanLeft is the outlet to the button and panCounter is an int  
declared in the .h file.

- (void)awakeFromNib
{
	[myPanLeft setContinuous:YES];
	[myPanLeft setState:NSOnState];
	panCounter = 0;
}


- (IBAction)panLeft:(id)sender
{
	if ([sender state] == NSOnState) {
		if (panCounter == 0) {
			NSLog (@"Button pressed down");
			panCounter ++;
		}
	}
	if ([sender state] == NSOffState) {
		NSLog (@"Button released");
		panCounter = 0;
		[myPanLeft setState:NSOnState];
	}
}

On Feb 9, 2007, at 10:33 AM, Shawn Erickson wrote:

> On 2/9/07, Brad Carter <bcarter at mac.com> wrote:
>
>> I can't figure out how to do this in Cocoa.  I have subclassed
>> NSButton and overridden mouseDown: and mouseUp and display this to
>> NSLog confirming my success.  How do I tell what button was pressed
>> in the mouseDown: method?  I can't find anything in NSEvent that
>> would hint that this info would be passed as an NSEvent.  Here's my
>> code below.
>
> Oh I may have misread what you asked above... by "button" did you mean
> mouse button or user interface button?
>
> The reference documentation I linked earlier covers both questions but
> in case of the former...
>
> mouseDown:, mouseDragged:, and mouseUp: only happens if the "left"
> (primary) mouse button is clicked. So you don't need to check event
> type... getting the message implies that the primary button was
> clicked.
>
> rightMouseDown:, rightMouseDragged:, and rightMouseUp: only happen if
> the "right" (secondary) mouse button is clicked.
>
> All other buttons that the mouse may have come in via otherMouseDown:,
> otherMouseDragged:, and otherMouseUp: messages and you would check
> [event buttonNumber] to know which button on the mouse was clicked.
>
> Finally note that scroll wheel events come in via scrollWheel:.
>
> -Shawn




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