[Chameleon] mouse events, active tool

[Paul Spencer]

Bart,

I agree with your evaluation of how mouse handling should be done.  As 
part of fixing the javascript performance issue (by restricting mouse 
events to the map image), I will also try to accomodate your request to 
not interpret the right mouse button as an action button.

For the navigation commands, there are a couple of known issues.  One is 
that the mouse click handling is fairly promiscuous, so if you have a 
select box that overlaps the map image and you select an item in the 
list, then a mouse click is generated on the map too.

I am hoping to fix this particular problem within the same mechanism, by 
  only connecting to mouse click events when the mouse is actually over 
the map, but I may have to do something along the lines you suggest to 
ensure that activating another tool doesn't cause some navigation effect.

The problem with this is that selecting something from the quickzoom or 
some other input on the page should not really cancel the fact that you 
have the zoom in tool selected, for instance.

Thanks for all the great input,

Cheers,

Paul

Bart van den Eijnden wrote:
> Hi list,
> 
> I want to address 2 issues in this e-mail, which are slightly related.
> 
> First of all I have noticed that the navigational tools work with all 
> mouse buttons, i.e. also when pressing the right mouse button the map 
> zooms in etc. This complicates things when a user wants to save the map 
> image using the "save image as" browser functionality. Chameleon will 
> act on the active navigational command, instead of presenting the 
> browser popup menu. Also there is no way to clear the active 
> navigational tool as far as I have noticed. You can change it by 
> clicking on another navigational tool, but not "clear" it.
> 
> Secondly, a previously noted issue came to my mind, the problem when a 
> user selects an item from the locations picklist (quickview), that 
> Chameleon also processes according to the current/active navigational 
> command. E.g. if the Query tool is the active tool, you also get the 
> Query results presented when selecting a location to zoom to. BTW I 
> don't know for sure if the Query tool also works through the NAV_CMD 
> variable.
> 
> In my opinion, some of this behaviour could be corrected by:
> 
> a) do not let navigational tools work on a right mouse button press
> b) when selecting/using another widget, put the NAV_CMD to an empty 
> string, so that there is no active navigational tool on the map. E.g. on 
> the OnEnter event of the select box of the quickview, set NAV_CMD to an 
> empty string.
> 
> Any thoughts on this?
> 
> Best regards,
> Bart
> _______________________________________________
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> Chameleon@lists.maptools.org
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> 

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|Paul Spencer                           spencer@dmsolutions.ca    |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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