Re: Tooltip ans Sound - 2nd posting
- To: mathgroup at smc.vnet.net
- Subject: [mg93422] Re: Tooltip ans Sound - 2nd posting
- From: David Bailey <dave at removedbailey.co.uk>
- Date: Fri, 7 Nov 2008 06:00:58 -0500 (EST)
- References: <gepb36$si1$1@smc.vnet.net> <gerqjb$res$1@smc.vnet.net> <geuc1g$fev$1@smc.vnet.net>
dh wrote:
> Hallo David,
>
> I would like to understand your solution. Why is EmitSound evaluated? I
>
> (probably wrongly) thought that Dynamic[..] is reevaluated only if the
>
> argument changes, not on every display.
>
> Daniel
>
>
>
> David Bailey wrote:
>
>> axel wrote:
>
>>> Hello,
>
>
>>> I have found that Tooltip[obj1, obj2] evaluates obj2 upon a mouseover
>
>>> event on obj1. The objects can either be Text or Graphics, all
>
>>> combinations work. Here is my question: can I use a Sound as obj2? I
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>>> want to hear a specific sound when my mouse enters the notebook area
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>>> occupied by obj1.
>
>
>>> Thank you
>
>
>>> Axel
>
>
>>> PS: using Tooltip[obj1, Play[...]] works but is not useful because one
>
>>> cannot reach the play-button. Also, I want to hear the sound upon the
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>>> mouseover event, without the need of further action.
>
>
>
>> I don't think obj2 is evaluated at the point of mouseover, but that
>
>> would not stop obj2 being a graphics object. To get an immediate sound
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>> (as opposed to a widget that can play a sound) you need EmitSound, which
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>> needs to execute when it is displayed, which you can get using Dynamic:
>
>
>> Tooltip[fred,
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>> Dynamic[EmitSound[
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>> Sound[{SoundNote["c5", 0.3], SoundNote["g4", 0.3]}]]; ""]]
>
>
>> David Bailey
>
>> http://www.dbaileyconsultancy.co.uk
>
>
>
>
>
>
Of course, I tested that this works! It was something of a hunch - I
guessed that the dynamic mechanism does not track every tooltip that is
not active - there could be a lot in certain applications - and
therefore that it would probably need to re-evaluate when the tooltip
got displayed.
David Bailey
http://www.dbaileyconsultancy.co.uk