[Webkit-unassigned] [Bug 54636] New: Image Map doesnt update region when dynamically altering an area

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=54636

           Summary: Image Map doesnt update region when dynamically
                    altering an area
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows Vista
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bz at purplex.co.uk


If you create an image map with an area, and then you change the coordinates for that area after you have moved the mouse over it, then the area will not update to the new coordinates.

In the following example, there is a single area to the left of the image. If you click on it, the area should move to the right, but it doesn't.

<img ismap usemap="#map1" style="width:200; height:100"/>
<map name="map1">
<area id="area1" shape="rect" coords="0,0,100,100" href="#" title="xx"/ onclick="document.getElementById ('area1').coords = '100,0,200,100'">
</map>

I believe the bug lies in HTMLAreaElement.cpp in the mapMouseEvent() function.
It only recreates the region for the area if the associated image size changes.
If I resize the image as in the code below, then it works.

<img id="image1" ismap usemap="#map1" style="width:200; height:100"/>
<map name="map1">
<area id="area1" shape="rect" coords="0,0,100,100" href="#" title="xx"/ onclick="document.getElementById ('area1').coords = '100,0,200,100'; document.getElementById ('image1').style.width = 201">
</map>

The code needs changing to recalculate the region when the shape type or coordinates of the area have changed since the last call.
i.e. add a recalculate flag that gets set when either of these attributes change.

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