Bug 36995 - [Forms] Tableview Cell styles get jumbled up when scrolling quickly
Summary: [Forms] Tableview Cell styles get jumbled up when scrolling quickly
Status: CONFIRMED
Alias: None
Product: Forms
Classification: Xamarin
Component: Android ()
Version: 2.0.0
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-12-14 20:34 UTC by Matthew Regul
Modified: 2017-09-15 05:14 UTC (History)
7 users (show)

Tags: ac
Is this bug a regression?: ---
Last known good build:

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Related Links:
Status:
CONFIRMED

Description Matthew Regul 2015-12-14 20:34:47 UTC
**Overview:**
(Observed on Android) Tableview cells get their styles jumbled by scrolling quicking (presumably do to cells being reused)

Screencast - https://dl.dropboxusercontent.com/u/62849286/Cases/240890/demo.mp4
Sample App - *See Private Comment Below*


**Steps to Reproduce:**
Run the Sample App - *See Private Comment Below*
- Scroll down to the bottom of the list
- Observe the different colors
- Scroll up and down on the page a few times
- Observe that some of the cell styles have swapped, but the text contents remains the same


**Actual Results:**
At times the wrong style is displayed inside the cells


**Expected Results:**
Correct style regardless of scrolling


**Build Date & Platform:**
- Xamarin.Forms 2.0.0.6490
- Xamarin Studio (Windows) - https://gist.github.com/mattregul/dd50419746a7b7de8c24#file-xamarin-studio-version-cs
- Visual Studio 2013 - https://gist.github.com/mattregul/dd50419746a7b7de8c24#file-visual-studio-version-info-cs
Comment 3 Mihail 2015-12-16 07:19:24 UTC
I am also able to reproduce the issue. 

The problem, I think, is that every time a hidden content (a cell) is shown, the custom renderer for this row's controls (Entry, Picker, etc) is invoked and the check for oldElement == null does not pass - thus sometimes the renderer thinks that the element is a new one and renders it from scratch.