[udig-devel] Reseting the blackboards

[Jesse Eichar]

Hmmm a good question.  The main thing that concerns me clearing the  
Map's blackboard as it can have unintended consequences.  I wouldn't  
do a whole sale clear on it.  There are some Constants in a file.   
Can't remember the exact name, something like BlackboardConstants.


Jesse

On Aug 9, 2007, at 1:12 AM, tony.roth at GMX.de wrote:

> I'm still working on the polygon based search in my backend systems.
> The user can draw polygons and start a search. This works. To  
> 'clean' the map the user can remove the polygons from the map with  
> an action (button on toolbar, whatever). To remove the polygons  
> from the layer / map:
>
>  public void removeAllContent(){
>   try{
>    FeatureStore fs = layer.getResource(FeatureStore.class, null);
>    fs.removeFeatures(Filter.NONE);
>   }catch (Exception e){
>     // exception handling
>   }
>   // 1.
>   myMap.getBlackBoardInternal().clear;
>   // 2.
>   EditBlackboardUtil.resetBlackboards(myMap);
>  }
>
> The Blackboard and all this stuff confused me a bit.
> Without the last command (#2) the features are removed from the  
> layer but the last drawn polygon is still on the Blackboard and  
> shown. The last (#2) command removes it from the blackboard.
> The command removes the polygon / shape from the blackboard, but  
> since the last feature / polygon was selected (or editable?), the  
> marks of the vertices (little green squares) are still on the map.  
> To deselect (?) I use the #1 command which clears the blackboard.  
> After this action no polygon is selected / editable (somewhere in  
> the code I found the explanation of the difference but I forgot it)  
> and combined with #2 the map is cleared.
> I fixed my problem. To be honest it was just by trying a lot of  
> commands and not because I really know what I have to do.
>
> Is this a valid way or crap? I guess (hope) there exists a much  
> easier way to achieve this functionality.
>
> tony roth
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
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