Re: Detect "whitespace" click on JSVGCanvas?

[Andres Toussaint]

Hi Ted:
I have created a simple tutorial depicting this kind of situation, and 
i have posted it in the batik wiki:
http://wiki.apache.org/xmlgraphics-batik/BackgroundGlassPaneTutorial

Hope this small tutorial is of some help for you.
Andres.
On May 17, 2005, at 1:39 PM, [EMAIL PROTECTED] wrote:
Andres,
I have tried a dozen ways to implement a "glasspane" over the last few
days.
All attempts have been unsuccessful.
I don't know what is wrong. I don't know what else to try.
In my svg file, I added this rectangle:
    <g id="top">
      <g transform="translate(50,30)" style="fill:none; 
mouseevents:fill">
        <rect x="0" y="0" width="400" style="stroke:none;" 
height="400" />
    </g>

In my (Java) code, I register eventlisteners with the this "top" 
element:

   public void registerRootListener() {
     Element elt = theDocument.getElementById("top");
     if (elt!= null){
         EventTarget t = (EventTarget)elt;
         try{
             // Add mouse event listeners
             t.addEventListener("click",      new OnRootClickAction(),
false);
             t.addEventListener("mouseenter", new
OnRootMouseEnterAction(),false);
         }
         catch (Exception e){
               System.out.println("Exception in 
registerRootListener()");
              e.printStackTrace();
         }
     }else{
       System.out.println("registerRootListener FAILED");
     }
 }

 public class OnRootClickAction implements EventListener {
     public void handleEvent(Event evt) {
       System.out.println("ROOT Click ACTION.");
 }
 }
     public class OnRootMouseEnterAction implements EventListener {
       public void handleEvent(Event evt) {
         System.out.println("ROOT MouseEnter ACTION.");
   }
  }


             Andres Toussaint
             <[EMAIL PROTECTED]
             .com>                                                     
 To
                                       
batik-users@xmlgraphics.apache.org
             05/12/2005 11:17                                          
 cc
             AM
                                                                   
Subject
                                       Re: Detect "whitespace" click on
             Please respond to         JSVGCanvas?
             [EMAIL PROTECTED]
             aphics.apache.org




In this case, you should add a "Glasspane" object as your background
and attach a mouseclick listener to it.
Since your "Rectangle Elements" will be on top of this "Background
glasspane (fill:none, mouseevents:fill)" the mouse event only applies
to the topmost visible element.
So your Background will react only if the click is over it, and it will
not react if the click is over any other element. I use this approach
to provide a "De-select" option.
Andres.
On May 11, 2005, at 9:57 AM, [EMAIL PROTECTED] wrote:
I have a JSVGCanvas (with a DOM representaion) of an imported SVG 
file.
This file basically contains a plain white grid with several
rectangles in
it.
I need to detect if the user has clicked in a "whitespace" area (ie.
not in
a rectangle "Element").

I have a Event listener on each rectangle, so I can detect a "click"
within
the rectangle itself.
Attempts to put an Event  listener on the "whole document" like this
have
failed:
     Element elt = theDocument.getDocumentElement();
     EventTarget t = (EventTarget)elt;
     t.addEventListener("click",     new WhiteSpaceClickAction(),
false);
I can detect ALL mouse events on the JSVGCanvas itself using Mouse
Listeners,
 (ie. MouseListener, MouseMotionListener)  but this still doesn't 
help,
since I can't tell if the
X, Y coordinates are "in" a rectangle or not.

Is there a "standard" way to do this?
Is there an API call to query if a coordinate is within an Element?
Thanks for any help.
Ted
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