Hi HODAC,
"HODAC, Olivier" <[email protected]> wrote on 10/26/2009 10:31:25
AM:
> Seems to be a good Idea, this getIntersectionList with a 1pixel
> rect, isn?t it?
Right, but I think I confused you a little.
> I am looking at the Dom specification, but it seems that I have not
> the right technic to sniff around W3C documentation (tell me how to
search?).
www.google.com ;)
More seriously you can download most W3C Specs as PDF.
> ONE
> I try to get a viewportElement (assuming that it is the displayed
> rect to pass as an argument to the function.:
> SVGElement viewportElement = canvas.getSVGDocument
> ().getRootElement().getViewportElement();
>
> Unfortunately, it returns null. Do you know why ? what?s the
> difference with the getViewport()?
The root SVG element has now ViewportElement since it is the
topmost ViewportElement.
> TWO
> I pass the root element to the function. It fails with
nullpointerexception.
Any more info on the NPE or how you called the function?
> While waiting, I?ll try the Heidrun method.
Actually Heidrun's method is my recommended solution but not
by adding a listener to every element. Simply add one listener
to the root of the SVG tree and check the 'target' field to know
what element the hit was on (that is what I meant by 'doing it a
different way').
> De : [email protected] [mailto:[email protected]]
> Envoyé : lundi 26 octobre 2009 13:44
> À : [email protected]
> Cc : [email protected]
> Objet : Re: locate an SVG element using x, y position
>
> Hi Heidrun, HODAC,
>
> > On Mon, 26 Oct 2009 10:44:49 +0100, HODAC, Olivier wrote:
> >
> > >I'd like to add a mouse listener on my JSVGCanvas to select an
element
> > >of my rendered SVG.
> > >How can I find the right node using x,y mouse postion?
>
> I suggest following Heidrun's suggestion of adding a mouse
> event listener (click, mouseOver, mouseExit, etc), although I would
> suggest doing it a different way.
>
> However another approach would be to use the 'getIntersectionList'
> method available on the svg:svg element.
>
> I suggest reading the DOM2 Events specification as it offers
> everything most people need in this area:
> http://www.w3.org/TR/DOM-Level-2-Events/
>
> Heidrun Beer <[email protected]> wrote on 10/26/2009 06:59:11 AM:
>
> > You need to add an event listener to each element as
> > you create it. If you load your drawing from a file,
> > you need to loop through the whole element tree and
> > add it to each element. It's not so much code, as
> > you do it all in a loop.
>
> Actually if you want to be notified of all mouse events
> I would suggest registering one listener on the root
> SVG element (probably during the capture phase). You can
> then use the target field to know what element the
> event is targeted for.
>
> > I have the special situation that I skip the first element,
> > which is a background rectangle that I don't want to be
> > moveable. It is always the first in the document.
>
> This can be handled with the one event listener by simply
> skipping events that have the background rectangle as the
> event target.
>
> The one listener approach will also save considerably on
> memory.
> This mail has originated outside your organization, either from an
> external partner or the Global Internet.
> Keep this in mind if you answer this message.
>
> The information in this e-mail is confidential. The contents may not
> be disclosed or used by anyone other than the addressee. Access to
> this e-mail by anyone else is unauthorised.
> If you are not the intended recipient, please notify Airbus
> immediately and delete this e-mail.
> Airbus cannot accept any responsibility for the accuracy or
> completeness of this e-mail as it has been sent over public
> networks. If you have any concerns over the content of this message
> or its Accuracy or Integrity, please contact Airbus immediately.
> All outgoing e-mails from Airbus are checked using regularly updated
> virus scanning software but you should take whatever measures you
> deem to be appropriate to ensure that this message and any
> attachments are virus free.
