[Webkit-unassigned] [Bug 16854] display title in tooltip onmouseover in SVG

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=16854





--- Comment #6 from Jeff Schiller <codedread at gmail.com>  2010-04-13 22:13:25 PST ---
Ok, I have a patch for this.  Let me put together the story for tooltips in
SVG:

  * if user hovers over a linked element that has a xlink:title, the
xlink:title becomes the tooltip
  * if not linked, then the element under the cursor (nearest enclosing DOM
node) is checked for a <title> element and that is used
  * if no title is found, then go up to the parent and look for a title, etc

This is all taken care of by WebKit's HitTestResult and adding a title() method
to SVGStyledElement.

Special cases:

  * if element is a <use>, then the use's title should be the tooltip.  If the
<use> does not have a title, then look into the rendered shadow content
(referenced DOM) for the title as per above

I should note that for the case of a <symbol> being referenced by a <use>, the
<symbol> itself is not checked for a <title> element.  This is because the
symbol is not rendered (unlike a <g>).  To solve this in the weather symbol
file, I had to move wrap the contents of the <symbol> elements in a <g> and the
tooltips showed up.  I'll also attached the modified weather file.

The patch which implements all of this but does not get one case in my test
file correct:

<defs>
  <ellipse id="e1">
    <title>FAIL</title>
  </ellipse>
</defs>

<use xlink:href="#e1">
  <title>PASS</title>
</use>

Interestingly, if the <use> references a <symbol> in the above case, the
tooltip displays properly.  I'm still investigating this case but I think it
should be raised as a different bug.

Can someone review the patch?  Can someone suggest how this can be tested? 
Since it's driven by manual user interaction I'm not sure the best approach.

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