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List:       kde-panel-devel
Subject:    Re: Review Request 111748: Better wrap QMimeData by retaining support for QByteArray
From:       "Eike Hein" <hein () kde ! org>
Date:       2013-07-27 18:41:12
Message-ID: 20130727184112.22041.90400 () vidsolbach ! de
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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/111748/
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(Updated July 27, 2013, 6:41 p.m.)


Review request for Plasma, Marco Martin and Sebastian Kügler.


Changes
-------

Cleaned up diff; v1 contained an accidental paste.


Description
-------

DeclarativeMimeData::setData() is QString type, QString data, while QMimeData::setData() is \
QString type, QByteArray data. The former ends up calling the latter with data.toLatin1().

I have a need to set a QByteArray payload in the taskbar - X11 WIds, as understood e.g. by \
pagers.

The proposed patch changes the DeclarativeMimeData::setData() signature to QString type, \
QVariant data. The implementation checks whether the QVariant is a byte array, and if so, hands \
it to the base class implementation. If it's not a byte array, it checks if it can be converted \
to a QString, and if so, hands the string version's toLatin1() to the base class. If the \
QVariant is neither a byte array nor convertable to a string, nothing is done.

This means behavior changes as follows:
- Byte array support is back.
- Anything that QVariant knows how to convert to a QString is converted. This maybe subtly \
different from how QML "casts" to QString, but I think fits the original sentiment of changing \
                the signature to use QString.
- Non-bytearray/string-convertable data is silently dropped.

If this patch is accepted, I would like to backport it to KDE/4.11 as well and make use of the \
improved implementation to restore drag-task-to-pager behavior in the new QML task manager.


This addresses bug 322567.
    http://bugs.kde.org/show_bug.cgi?id=322567


Diffs (updated)
-----

  src/declarativeimports/draganddrop/DeclarativeMimeData.h ec725af 
  src/declarativeimports/draganddrop/DeclarativeMimeData.cpp e7cab10 

Diff: http://git.reviewboard.kde.org/r/111748/diff/


Testing
-------

I haven't even built the thing. It's terribad.


Thanks,

Eike Hein


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      This is an automatically generated e-mail. To reply, visit:
      <a href="http://git.reviewboard.kde.org/r/111748/">http://git.reviewboard.kde.org/r/111748/</a>
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<div>Review request for Plasma, Marco Martin and Sebastian Kügler.</div>
<div>By Eike Hein.</div>


<p style="color: grey;"><i>Updated July 27, 2013, 6:41 p.m.</i></p>



<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Changes</h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: 1px solid \
#b8b5a0">  <tr>
  <td>
   <pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; \
white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Cleaned up diff; v1 \
contained an accidental paste.</pre>  </td>
 </tr>
</table>




<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
 <table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: 1px \
solid #b8b5a0">  <tr>
  <td>
   <pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; \
white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">DeclarativeMimeData::setData() is QString type, QString data, while \
QMimeData::setData() is QString type, QByteArray data. The former ends up calling the latter \
with data.toLatin1().

I have a need to set a QByteArray payload in the taskbar - X11 WIds, as understood e.g. by \
pagers.

The proposed patch changes the DeclarativeMimeData::setData() signature to QString type, \
QVariant data. The implementation checks whether the QVariant is a byte array, and if so, hands \
it to the base class implementation. If it&#39;s not a byte array, it checks if it can be \
converted to a QString, and if so, hands the string version&#39;s toLatin1() to the base class. \
If the QVariant is neither a byte array nor convertable to a string, nothing is done.

This means behavior changes as follows:
- Byte array support is back.
- Anything that QVariant knows how to convert to a QString is converted. This maybe subtly \
different from how QML &quot;casts&quot; to QString, but I think fits the original sentiment of \
                changing the signature to use QString.
- Non-bytearray/string-convertable data is silently dropped.

If this patch is accepted, I would like to backport it to KDE/4.11 as well and make use of the \
improved implementation to restore drag-task-to-pager behavior in the new QML task \
manager.</pre>  </td>
 </tr>
</table>


<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: 1px solid \
#b8b5a0">  <tr>
  <td>
   <pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; \
white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I haven&#39;t even \
built the thing. It&#39;s terribad.</pre>  </td>
 </tr>
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<div style="margin-top: 1.5em;">
 <b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>


 <a href="http://bugs.kde.org/show_bug.cgi?id=322567">322567</a>


</div>


<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> (updated)</h1>
<ul style="margin-left: 3em; padding-left: 0;">

 <li>src/declarativeimports/draganddrop/DeclarativeMimeData.h <span style="color: \
grey">(ec725af)</span></li>

 <li>src/declarativeimports/draganddrop/DeclarativeMimeData.cpp <span style="color: \
grey">(e7cab10)</span></li>

</ul>

<p><a href="http://git.reviewboard.kde.org/r/111748/diff/" style="margin-left: 3em;">View \
Diff</a></p>







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