Hello,
I don't know if this is more an IronPython (2.6.1) issue than a
Silverlight (4) issue, but I hope that I am talking to the right
audience again (thank you for the great answers last time).
I've created an `Image` class managing images based on
System.Windows.Media.Imaging.BitmapImage. My method
`image_instance.load_and_show()` should load the image from a given URI
and then show it in an XAML <image /> element. The important thing is
that the showing part should only happen after it is sure that the image
has loaded correctly. To control this, I use the BitmapImage.ImageOpened
event. This is the relevant part of the code from my `Image` class:
def load_and_show(self):
self.bi = BitmapImage(Uri(self.abspath, UriKind.Absolute))
self.bi.ImageOpened += self.successfully_loaded_now_show
self.bi.ImageFailed += self.load_failed
#self.xaml_main_image.Source = self.bi # LINE A
def successfully_loaded_now_show(self, s, e):
debug("image loaded: %s" % s.UriSource) # LINE B
self.xaml_main_image.Source = self.bi # LINE C
def load_failed(self, s, e):
debug("image load failed") # LINE D
If the code is like shown above and I do
`image_instance.show_and_load()`, nothing happens. More exactly, LINE B,
C, and D are not reached. It is like *neither the event ImageOpened nor
ImageFailed is toggled*.
If I re-activate (or un-outcomment =)) LINE A, the callbacks magically
work properly, i.e. after calling `image_instance.show_and_load()` the
image shows up in the UI (either via LINE A or C), and LINE B is
definitely reached (or LINE D in case of a wrong URI).
The point is that I don't want LINE A, because showing the image should
happen in a more controlled manner. What's the problem in my approach,
why are the callbacks not called?
Thank you in advance,
Jan-Philip Gehrcke
--
http://gehrcke.de
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