Adding dynamic event handlers using position

[Selva <se...@yahoo.co.in>]

Hi All,

When user presses the SVGCanvas, mousePressed event is finding the clicked 
element using the following code. Here I haven’t added event handlers for each 
element since it will have more than 200 elements. Instead I am using 
getIntersectionList.

SVGRect rect = svgCanvas.getSVGDocument().getRootElement().createSVGRect();
                     
rect.setX((float)point.getX());
rect.setY((float)point.getY());
rect.setWidth(1);
rect.setHeight(1);
                    
NodeList l = myroot.getIntersectionList(rect, null);

Once I found the elements, I will add the event handlers for the elements in 
the list. But these event handlers will work from the next mouse events. To 
resolve this, is it possible to simulate mousePressed event once again 
manually after added the event listeners?

If this is not a better way, please provide some other way to add the 
listeners for the elements dynamically?

Also is there anyway to select multiple elements in the SVG canvas? If it is 
possible, how mouse listeners will work?

Please give me the better solution to resolve these issues.

Thanks,
Selva



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Re: Adding dynamic event handlers using position

[Selva <se...@yahoo.co.in>]

Hi Thomas,

Thanks for your reply Thomas. It is very useful for me to work with event 
handlers.

Thanks,
Selva



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Re: Adding dynamic event handlers using position

[th...@kodak.com]

Hi Selva,

news <ne...@sea.gmane.org> wrote on 04/13/2006 09:23:19 AM:

> When user presses the SVGCanvas, mousePressed event is finding the 
clicked 
> element using the following code. Here I haven?t added event handlers 
for each 
> element since it will have more than 200 elements.

   You can register a single event handler on the root SVG element.  The
handleEvent method on this listener will be passed a DOMMouseEvent.  The
'getTarget()' will be the element the event mouse was over when the
mouse was clicked.

> Once I found the elements, I will add the event handlers for the 
elements in 
> the list. But these event handlers will work from the next mouse events. 
To 
> resolve this, is it possible to simulate mousePressed event once again 
> manually after added the event listeners?

   Sure, but I'm not sure I understand why one would want to do this???
SVGDocument has methods to create and dispatch events.

> If this is not a better way, please provide some other way to add the 
> listeners for the elements dynamically?

   I would just add the one listener and sort out which element was 
clicked
in that (custom attributes on elements can be a big help here).

> Also is there anyway to select multiple elements in the SVG canvas? If 
it is 
> possible, how mouse listeners will work?

   You can not select multiple elements in the Canvas.  A DOM event has
exactly one target.  The get intersection list could return multiple 
elements
and you could 'build' some form of multiple selection system using it but
DOM doesn't do this directly.


> Please give me the better solution to resolve these issues.

   I hope I have ;)



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