Cascades Development

[CrozyBB]

Very nice indeed! Thanks!

[alejandroh]

If I try to use this on my project, I get two error:

undefined reference to `WebImageView::staticMetaObject'

undefined reference to `vtable for WebImageView'

can't find the way to solve them.

[alejandroh]

Ok, solved by cleaning the proyect!!!

[RileyGB]

I've expanded on the sample provided by dridk and have implemented caching of images as well. Feel free to check it out at https://github.com/RileyGB/BlackBerry10-Samples/tree/master/WebImageViewSample

[Scott56]

Hey, I tried using your version since I need image caching, but I'm running into an issue.

I have a Grid listview of images that can get fairly long. When the list is loading, if the user quickly scrolls through the list before it's loaded the images, it seems that some urls in the cache are associated with the wrong image.

When I quickly scroll through the listview without caching, the device will load images, and then reload new images as it redownloads, and tries to catch up with the users quick scrolling. So with caching, it seems to be saving the first loaded image with the url of that list item.

Any suggestions?

[RileyGB]

Hi Scott,

Do the URL's change dynamically in your list? I've tried to reproduce this issue myself, but haven't been able to. I would suggest running a debugging session on WebImageView::setUrl and have some sort of comparison function to check for mismatches.

 I may try implementing caching in the https://github.com/blackberry/Cascades-Samples/tree/master/imageloader example to see if the results are a little nicer.

[kylefowler]

Yeah, theres a bug in the webimageview class in the imageLoaded slot. You automatically insert it into the cache based on the current value of the mUrl member variable but at any point the url of that object instance might not match up with the url of that network request. Youd need to check that the urls match before inserting or use the url from the qnetworkreply as the key for inserting into the cache

[Scott56]

This looks to have fixed the issue. I passed the reply url to SaveImageInCache, and used that as the key.

[dridk]

Use QNetworkDiskCache instead.... 

and in setUrl(), add  resetImage()

[RileyGB]

Thanks for the suggestions and input guys, I've updated my sample at https://github.com/RileyGB/BlackBerry10-Samples/tree/master/WebImageViewSample to use QNetworkDiskCache.