[PyQt] PyQt5 fails to handle QQuickImageProvider subclassing

[Julio César Gázquez]

El 04/01/17 a las 16:17, Phil Thompson escribió:
 >> ImageProvider supports Image type but has not implemented requestImage()
 >>
 >> Seems this message comes from Qt's 
QQuickImageProvider::requestImage() implementation, so it's like the C++ 
method isn't being overridden by the PyQt's wrapper method.
 >>
 >> These methods are somewhat peculiar, as they are virtual methods 
(and specifically meant to be subclassed) and have an /Out/ parameter. 
Doing a grep on the PyQt sources I see this only happens in two places 
outside this class. Maybe the wrapper for the virtual method lacks the 
/Out/ parameter?
 >>
 >>
 > Try it, just pip install the latest version into a venv.
No, I'm afraid it doesn't work even with 5.7.1 (via pip install on 
Ubuntu Xenial):

julio at marte:~/devel/test$ python3 test.py
ImageProvider supports Image type but has not implemented requestImage()
file:///home/julio/devel/test/test.qml:3:1: QML Image: Failed to get 
image from provider: image://images/any.jpg

 > Otherwise I would need a short complete example that demonstrates the 
problem.
 >
Minimal test example below.

test.py:

from PyQt5.QtCore import QUrl, Qt
from PyQt5.QtGui import QGuiApplication, QImage
from PyQt5.QtQuick import QQuickView, QQuickImageProvider


class ImageProvider(QQuickImageProvider):

      def __init__(self):
          super().__init__(QQuickImageProvider.Image)

      def requestImage(self, id_, requestedSize):
          """ Just a red image """
          image = QImage(requestedSize.width(), requestedSize.height())
          image.fill(Qt.red)
          return image, requestedSize


class Application(QGuiApplication):

      def __init__(self, argv):
          super().__init__(argv)
          self._view = QQuickView()
          self._view.engine().addImageProvider("images", ImageProvider())
          self._view.setSource(QUrl.fromLocalFile("test.qml"))
          self._view.show()


if __name__ == '__main__':
      app = Application([])
      app.exec_()


test.qml:

import QtQuick 2.1

Image {
      width: 400
      height: 300
      source: "image://images/any.jpg"
}

TIA.

Greetings, Julio.

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