MPowerKit.VirtualizeListView 1.0.2

MPowerKit.VirtualizeListView

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!

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

builder
    .UseMauiApp<App>()
    .UseMPowerKitListView();

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:

<mpowerkit:VirtualizeListView>
	<mpowerkit:VirtualizeListView.ItemsLayout>
		<mpowerkit:LinearLayout ItemSpacing="15" />
	</mpowerkit:VirtualizeListView.ItemsLayout>
</mpowerkit:VirtualizeListView>

By default it has zero spacing.

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.