Closed Hangarspace closed 7 years ago
Hangarspace
commented
7 years ago Note suer if this would help at all, but I reproduced the repro app in a pure UWP (non xamarin) project using the FlipView control, and the issue does not appear to exist.
alexrainman
commented
7 years ago Can you try FFImageLoading?
Hangarspace
commented
7 years ago Will that work with images from that are on disk? I thought it was just to cache images from web?
I can definitely try it.
On 19 Jun 2017, at 17:00, Alex Rainman notifications@github.com<mailto:notifications@github.com> wrote:
Can you try FFImageLoading?
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alexrainman
commented
7 years ago Yeah,it will work from disk :)
alexrainman
commented
7 years ago Problem solved?
Hangarspace
commented
7 years ago Yes thanks. I did send a mail yesterday, but you probably missed it.
Many thanks for your help.
On 21 Jun 2017, at 12:58, Alex Rainman notifications@github.com<mailto:notifications@github.com> wrote:
Problem solved?
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Chris Stephens Mobile Analyst
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Firstly, great work, your dedication and commitment to the Carousel control is fantastic and should be rewarded.
We are using the Carousel control in our Xamarin app, primarily focusing on UWP. The control is tied to a datasource that is a list of products. In simple terms each item has a text description and an ImageSource. We are finding there is a problem whereby the image is not always rendered for one or two items out of about 100.
The images are on disk and the data model is populated 100% correct. It happens maybe 50% of the time, and when it happens it is always the fourth item in the list. Changing the data so we swap the positions of say the 3rd and 4th items, the problem still occurs at the 4th position in the list. Inspecting the ImageSource for the missing item shows it has valid data.
Setting the carousel's itemsource to null and then back to the original source resolves the issue 95% of the time (or recreates it if you do this repeatedly). This does not cause the original datasource to be rebuilt or changed in anyway. The datasource is fully generated and populated before being attached to the view in the first place.
Calling an OnPropertyChanged notification for the imagesource property doesn't appear to have any effect.
It happens on multiple different tablets and desktop. I don't think its a performance issue or resource issue due to it happening on dev pc.
I have created a repro project that shows the behaviour. The repro project behaves slightly different in that the chances of it occuring are slight less, so if at first shows all images, scroll thru the first six or so and then tap the 'Reload' button and scroll back to the start where you will invaribly find missing images.
https://www.dropbox.com/s/rzdf92bld7dyuff/CarouselRepro.zip?dl=0
A second issue that I will mention because it could be connected...
One of our clients who is testing on Surface 3 devices has screen savers setup that return to the windows user logon screen on wakeup. They are finding that following the screen saver/logon, the Carousel has lost multiple images. We are not doing any processing that would attempt do anything in the sleep/wakeup/resume scenarios.
Many thanks in advance.