[Webkit-unassigned] [Bug 58206] HTML5 drag and drop not working when getData is used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58206


Aparna Nandyal <aparna.nand at wipro.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |56486




--- Comment #1 from Aparna Nandyal <aparna.nand at wipro.com>  2011-04-10 10:59:50 PST ---
Analysis:
It is found that the value returned by getData in the following script in wrong:


function dragOver(ev) {
    var idelt = ev.dataTransfer.getData("Text");
    var id = ev.target.getAttribute('id');
    if( (id =='boxB' || id =='boxA') && (idelt == 'drag' || idelt=='drag2'))
        return false;
    else if( id =='boxC' && idelt == 'drag3')
        return false;
    else
        return true;
}

idelt is always undefined. On the other hand if the same web page (http://ljouanneau.com/lab/html5/demodragdrop.html) is downloaded and saved as html and opened through the QtTestBrowser, it works fine. 

Problem in the code:
String ClipboardQt::getData(const String& type, bool& success) const
{

    if (policy() != ClipboardReadable) {
        success = false;
        return String();
    }

    ....
}

The policy value is set as ClipboardTypesReadable in this case hence empty string is returned. The policy value is set in DragController::tryDHTMLDrag. If the URL is local, then clipboardReadable is set (which is why it works when the same html page is saved locally and then loaded in QtTestBrowser) else clipboardTypesReadable is set. 


Additional information: To get this fix working, patch in https://bugs.webkit.org/show_bug.cgi?id=56486 is a required (which is to get generic HTML5 drag and drop to work)

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