On Friday 10 September 2010, 01:35:24 David Boddie wrote:
> On Fri Sep 10 00:04:27 BST 2010, Hans-Peter Jansen wrote:
> > here's a PyQt version of the drop site example, that you might want to
> > add to the PyQt examples. Since modularity is a good idea generally,
> > I've kept the modules organization, but renounced supporting
> > translations.
> >
> > Has anybody an idea, which linux app is able to drop real images
> > similar as to what was done for the screenshot in the Qt docu?
> >
> > http://doc.qt.nokia.com/4.6/draganddrop-dropsite.html
>
> The Delayed Encoding example in Qt's examples directory will send the
> image data in a drag and drop operation.
Thanks, David. Phil, here's the fix for the broken QImage processing:
diff -up dropsite/droparea.py dropsite.fixed/droparea.py
--- dropsite/droparea.py 2010-09-10 11:44:43.641400431 +0200
+++ dropsite.fixed/droparea.py 2010-09-10 11:41:22.005311858 +0200
@@ -34,7 +34,10 @@ class DropArea(QtGui.QLabel):
def dropEvent(self, event):
mimeData = event.mimeData()
if mimeData.hasImage():
- self.setPixmap(mimeData.imageData())
+ # mimeData.imageData() is a QImage wrapped by in a QVariant.
+ # Thanks to sip's QVariant API Version 2, established in
+ # dropsite.py we just need to convert the QImage to a QPixmap.
+ self.setPixmap(QtGui.QPixmap(mimeData.imageData()))
elif mimeData.hasHtml():
self.setText(mimeData.html())
self.setTextFormat(QtCore.Qt.RichText)
diff -up dropsite/dropsite.py dropsite.fixed/dropsite.py
--- dropsite/dropsite.py 2010-09-10 11:44:50.369627362 +0200
+++ dropsite.fixed/dropsite.py 2010-09-10 11:39:35.957322907 +0200
@@ -8,6 +8,13 @@
###########################################################################
import sys
+
+# This is only needed for Python v2 but is harmless for Python v3
+# in order to access the QImage in DropArea.dropEvent() without
+# any explicit conversions (aka .toPyObject()).
+import sip
+sip.setapi('QVariant', 2)
+
from PyQt4 import QtCore, QtGui
from dropsitewindow import DropSiteWindow
> There's also a hidden example in
> the doc/src/snippets/separations directory that does a similar thing.
Nice. Let's see, how that one does with python. Stay tuned..
> I think the reason why many applications don't send image data directly
> is that it can involve a lot of data. The Delayed Encoding example still
> sends the image data, but it only generates it when the drag and drop
> operation is complete and the application has committed to sending it.
Yes, of course. I didn't find something in order to test this, and
consequently it failed..
My favorite motto in this respect:
Code that isn't tested won't work.
Sincerely,
Pete
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