Re: doubleClick slop?
Re: doubleClick slop?
- Subject: Re: doubleClick slop?
- From: Murat Konar <email@hidden>
- Date: Thu, 19 Apr 2007 14:29:01 -0700
On Apr 19, 2007, at 1:52 PM, I. Savant wrote:
On 4/19/07, Murat Konar <email@hidden> wrote:
The definition of a double click is a mouseUp event followed by a
mouseDown that occurs within a window of time (the double click
interval), and whose locations are "close enough".
Well, not really. From NSEvent's -clickCount documentation:
"Returns 0 for a mouse-up event if a time threshold has passed since
the corresponding mouse-down event. This is because if this time
threshold passes before the mouse button is released, it is no longer
considered a mouse click, but a mouse-down event followed by a
mouse-up event."
How does this negate my description of a doubleClick? The bit you
quote is a statement about what does not qualify as a multi-click,
not what does. It asserts that a mouseUp that occurs "a long time"
after the preceeding mouseDown considered distinct for the purposes
click counting, that's all.
I know how to get the double click interval. How do I get Cocoa's
opinion of how close is "close enough" (i.e. how close geometrically
must the locations of the mouseUp and mouseDown events be for the
mouseDown event to have a clickCount > 1)?
I don't know of a way to determine this myself, but given the quote
above, I don't think you're meant to. What you describe is more of a
click and a half. If I do the same thing with my pointer over a word
in this e-mail editor, for example, (click, let go, click and hold as
a double-click with the last click held), the word I'm clicking on
doesn't get highlighted, even when I let the last click go after a
delay.
I don't know which email client you are using, but in Apple's Mail
(a Cocoa app) a click-release (down, up) followed within the double
click time interval by a click-hold (down) DOES select the word as
soon as I click down.
With this in mind, the slop is irrelevant because the clickCount is
all you really need to know if it's a double-click (since the system
is determining this for you).
Now I may be grossly wrong, but that's the way I understand it. I
welcome any and all enlightenment! :-)
The delta between the first and second clicks is very relevant. A
click at 100, 100 followed by a click at 200, 200 will not be
considered a doubleClick no matter how close in time they occur.
_murat
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