Re: [Dynapi-Help] What is enableBlackboard?

[Raymond I. <xw...@ya...>]

Hi everyone,

Doug is correct about the functionality of the black
board. That's exactly what it was design for.

__
Raymond Irving

--- do...@cr... wrote:

> 
> 
> More verbose.. also checked code to verfiy.. the
> part about a transparent
> coverlayer was just smoke (won't say what kind of
> smoke..)
> 
> So.. 
> 
> As we know, if you add a child layer or widget to a
> layer, then set the html
> of that layer, the existing html (the child ler or
> widget) get's deleted.
> Obviously this can cause some issues if your coed
> expects said layer or widget
> to be there.
> 
> The solution to this is to call enabledBlackBoard on
> the parent layer.
> Having done this, when you call setHTML() on a layer
> that has it's Blackboard
> enabled, the html that you specify is placed within
> the blackboard instead of
> replacing the html of your parent layer.
> 
> Man reading the above just confuses me.. and i wrote
> it :-)
> new visual:
> 
> case 1 (no blackboard)
> create a layer and add a widget:
> (result)
> [myLayer]
>     [myWidget][/myWidget]
> [/myLayer]
> 
> then call myLayer.setHTML("where's the widget?")
> (result: note the widget is gone)
> [myLayer]
>     Where's the widget?
> [/myLayer]
> 
> case 2 (with blackboard)
> create a layer, add a widget, enable blackboard
> [myLayer]
>     [myWidget][/myWidget]
>     [_blkBoardElm][/_blkBoardElm]
> [/myLayer]
> then call myLayer.setHTML("there's the widget!")
> [myLayer]
>     [myWidget][/myWidget]
>     [_blkBoardElm]there's the widget![/_blkBoardElm]
> [/myLayer]
> 
> One thing i do notice while looking at the code is
> that we do not specifiy the
> Z-Order of the blackboard. This can cause a problem
> if the blackboard is added
> after a widget or childlayer has been added as the
> blackboard may overlap said
> child layers.
> 
> notes:
> if blackboard is enabled after a sethtml call (or
> layer is created with
> default html in the new dynlayer() call) then the
> html will be transferred to
> the blackboard.
> 
> Recommend specifying a largely negative Z-Order on
> the blackboard layer
> 
> Cheers
> 
> Leif W <war...@us...> said:
> 
> > > From: <do...@cr...>
> > > Sent: 2005 August 24 Wednesday 11:06
> > >
> > > here it is.. the blackboard as described below
> is to allow you to add 
> > > a child
> > > layer to a layer, and then later call sethtml on
> the parent layer 
> > > without
> > > accidently deleting the child layers :-)
> > 
> > >> before EnableBlackboard()
> > >> [myLayer]content[/myLayer]
> > >>
> > >> After EnabledBlackboard
> > >> [myLayer]
> > >>    [TransparentCoverLayer]
> > >>       [BlackBoard]
> > >>          Content
> > >>       [BlackBoard]
> > >>    [TransparentCoverLayer]
> > >> [myLayer]
> > 
> > Wow, excellent, thanks for that explanation and
> visual.
> > 
> > Leif
> > 
> > 
> > 
> > 
> > 
> >
>
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> 
> 
> -- 
> 
> 
> 
> 
> 
>
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