MAUI Virtualize ListView with smooth scrolling and without platform-specific code
It's not a secret to anybody, that ListView and CollectionView in MAUI have bad scrolling performance. This project started as an experimantal project to find a way to make a virtualize listview using ScrollView and AbsoluteLayout only. Suprisingly, the scrolling performance is way better, than was expected. So you can check it right now.
It works on all platforms MAUI supports and it has the same behavior on all platforms, because it does not have platform-specific code.
So, under the hood it is a ScrollView with AbsoluteLayout as items layout. The main idea of virtualization for this listview is to change Translation of items while keeping them attached to the AbsoluteLayout. ItemsLayout is responsible for virtualization process and for creating / removing views and it will not create more views as necessary.
Your PRs are welcome!
Android
Windows
Implemented features:
Linear items layout
Grid items layout
Items spacing
Virtualization
Grouping
Collection padding
Scroll orientation (collection orientation)
Disable scrolling
Header / Footer
Load more
Item tap handling
Item resize handling
Add, Remove, Replace, Move, Reset operations on collection
Drag and drop (reordering)
Sticky headers
Animated add/remove/move operations
Usage
Add UseMPowerKitListView() to your MauiProgram.cs file as next
and in your xaml just use as a regular CollectionView.
Note: The root of the ItemTemplate has to be typeof(VirtualizeListViewCell), but group/header/footer templates are not allowed to have root of this type.
To change items spacing you need to reset the ItemsLayout property as next:
To change collection orientation just change the Orientation property of the VirtualizeListView as you would do this in ScrollView.
To disable scroll set CanScroll property to false, and do not change Orientation property to Neither.
Other useful features
FixedRefreshView
This package brings to you fixed MAUI's RefreshView as FixedRefreshView. Here, you can disable refreshing without disabling entire collection. For this you may use IsPullToRefreshEnabled.
ObservableRangeCollection
Also, this package contains ObservableRangeCollection which is a ObservableCollection, but it has a bunch of useful methods to manipulate the collection with batch updates. Recommended to use with VirtualizeListView. It provides few methods: AddRange, InsertRange, RemoveRange, ReplaceRange.
Known issues
In debug mode it can have bad scrolling performance, especially on Windows, but in release mode it works surprisingly very well.
