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[Bug 16673] New: Specify how MouseEventExtension coordinates are set using initMouseEvent()

From: <bugzilla@jessica.w3.org>
Date: Mon, 09 Apr 2012 21:18:40 +0000
To: public-css-bugzilla@w3.org
Message-ID: <bug-16673-5148@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=16673

           Summary: Specify how MouseEventExtension coordinates are set
                    using initMouseEvent()
           Product: CSS
           Version: unspecified
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: CSSOM View
        AssignedTo: dave.null@w3.org
        ReportedBy: jrossi@microsoft.com
         QAContact: public-css-bugzilla@w3.org


The initMouseEvent() method from DOM L3 Events allows for the creation of
synthetic mouse events [1]. However, it seems it was defined prior to the
existence/standardization of the extensions to MouseEvent [2]. For
compatibility reasons, we don't believe we can change the signature of
initMouseEvent() to include properties like pageX/pageY.  Instead, we suggest
calculating these values based on the inputs provided for clientX/clientY. This
seems to be what Webkit (and to some extent, Firefox) do.

pageX =  clientX + scrollLeft  (using the values at the time of calling
initMouseEvent)
pageY = clientY + scrollTop
x = clientX
y = clientY

Prior to calling dispatchEvent() (which indicates a target element for the
event)"
offsetX = pageX
offsetY = pageY

After calling dispatchEvent()  (e.g. during and after the dispatch of the
event):
offsetX = the x offset relative to the padding edge of the target element (as
reported in the element's coordinate space)
offsetY = the y offset relative to the padding edge of the target element (as
reported in the element's coordinate space)

[1]http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-event-type-initMouseEvent
[2]http://dev.w3.org/csswg/cssom-view/#extensions-to-the-mouseevent-interface

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Received on Monday, 9 April 2012 21:18:43 GMT

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