AW: RE: [cgmo-webcgm] ISSUE: priority of navigation, pan, and zoom interactions

["Weidenbrueck, Dieter" <dweidenbrueck@ptc.com>]

Lofton,

I don't think that "simultaneous" is really possible, so we are in agreement.

Dieter
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-----Original Message-----
From: Lofton Henderson <lofton@rockynet.com>
To: Weidenbrueck, Dieter; CGM Open WebCGM TC <cgmo-webcgm@lists.oasis-open.org>
Sent: Mon Feb 04 10:28:53 2008
Subject: RE: [cgmo-webcgm] ISSUE: priority of navigation, pan, and zoom   interactions

At 12:00 PM 2/3/2008 -0500, Weidenbrueck, Dieter wrote:

>I think that a priority would only be needed for situations where two
>distinct ways of navigation are executed at the same time, which will
>rarely be the case.

Correct.  In fact, as far as viewer software is concerned ... is there 
*ever* a simultaneous action?  One will always be ahead of the other in the 
event queue, it seems to me (but on the other hand, I don't write event 
handling software).


>Otherwise, simply the last action prevails.

Right, that's exactly what I was thinking.

Furthermore, it seems to me that there is always a "last action" -- I'm not 
sure "same time" is possible.

>This is consistent with the
>behavior we have:
>- a navigation to a grobject is executed and moves to a certain view
>context or destination rectangle
>- the user subsequently starts panning
>Of course, the result of the panning is what the user wants to see, not
>the result of the previous navigation.

Agreed.

-Lofton.


>-----Original Message-----
>From: Lofton Henderson [mailto:lofton@rockynet.com]
>Sent: Sonntag, 3. Februar 2008 11:27
>To: Cruikshank, David W; CGM Open WebCGM TC
>Subject: Re: [cgmo-webcgm] ISSUE: priority of navigation, pan, and zoom
>interactions
>
>[...sending again, there was a small typo in Scenario 2...]
>
>At 03:52 PM 2/1/2008 -0800, Cruikshank, David W wrote:
> >Proposal:
> >The order of priority for navigation, pan, and zoom are:
> >1) Viewer
> >2) JavaScript DOM transactions
> >3) XCF transactions
> >
> >If there is not futher discussion, this issue will be closed at the
> >next telecon.
>
>I think this is incomplete, and not ready for closure.
>
>In particular... what does it mean to list those things in priority
>order, #1, #2, #3.
>
>Scenario 1:  A.) a script executes the DOM panZoom Style Property
>method;
>B.) then the user changes the view with viewer's pan/zoom controls.
>Result
>-- the user action prevails.
>
>Scenario 2:  A.) a script executes a DOM panZoom Style Property method;
>B.) then the user changes the view with viewer's pan/zoom controls; C.)
>then the script (possibly after some interaction with the user) executes
>another panZoom SP method.  Question:  does the above ranking of #1
>priority for viewer controls and #2 ranking for DOM transactions mean
>that step B overrules step C, even though the latter occurs later?  I
>don't think so.  I think step C prevails.
>
>-Lofton.
>
>
>
>
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