Windows UI Library - Roadmap Win UI3.0

https://github.com/microsoft/microsoft-ui-xaml/blob/master/docs/roadmap.md

微软更新太快了。是不是要把开发人员折磨死。。。。

Windows UI Library Roadmap
WinUI is the native UI platform for Windows 10. This document outlines the prospective roadmap for WinUI through 2019 and into 2020. WinUI is under active development by the Microsoft developer platform team and the roadmap will continue to evolve based on market changes and customer feedback, so please note that the plans outlined here aren't exhaustive or guaranteed. We welcome your feedback on the roadmap: please feel free to contribute to existing issues or file a new issue.

The WinUI team has two major efforts underway:

WinUI 2: new and updated controls and features for UWP apps

WinUI 3: a major update to the Windows 10 UI platform

WinUI 2
The next release of WinUI 2 will be WinUI 2.3, ETA Q4 2019.

2.3 will be an incremental release that includes new WinUI Xaml features and fixes for UWP apps on Windows 10. You can find a list of currently planned work in the WinUI 2.3 milestone.

Conceptual overview of WinUI 2 for UWP apps:

WinUI 2 platform

WinUI 2 will eventually be superseded by WinUI 3. WinUI 3 will include all the controls and features in WinUI 2.

WinUI 3
Overview
WinUI 3 will greatly expand the scope of WinUI to include the full Windows 10 native UI platform, which will now be fully decoupled from the UWP SDK.

We're focused on enabling three main use cases:

Modernizing existing Win32 apps
Enabling you to extend existing Win32 (WPF, WinForms, MFC..) apps with modern Windows 10 UI at your own pace using the upcoming latest version of Xaml Islands
Creating new Windows apps
Enabling you to easily create new modern Windows apps "à la carte" with your choice of app model (Win32 or UWP) and language (.NET Core or C++)
Enabling other frameworks
Providing the native implementation for other frameworks like React Native when running on Windows
Conceptual overview of WinUI 3:

WinUI 3 platform

You can watch the Build 2019 conference session State of the Union: The Windows Presentation Platform for more details: https://mybuild.techcommunity.microsoft.com/sessions/77008

The existing UWP Xaml APIs that ship as part of the OS will no longer receive new feature updates. They will still receive security updates and critical fixes according to the Windows 10 support lifecycle.

The Universal Windows Platform contains more than just the Xaml framework (e.g. application and security model, media pipeline, Xbox and Windows 10 shell integrations, broad device support) and will continue to evolve. All new Xaml features will just be developed and ship as part of WinUI instead.

Benefits of WinUI 3
WinUI 3 will provide a number of benefits compared to the current UWP Xaml framework, WPF, WinForms and MFC which will make WinUI the best way to create Windows app UI:

The native UI platform of Windows
WinUI is the highly-optimized native UI platform used to create Windows itself, now made more broadly available for all developers to use to reach Windows. It's a thoroughly tested and proven UI platform that powers the operating system environment and essential experiences of 800+ million Windows 10 PC, XBox One, HoloLens, Surface Hub and other devices.

The latest Fluent Design
WinUI is Microsoft's main focus for native, accessible Windows UI and controls and is the definitive source for the Fluent Design System on Windows.
It will also support the latest lower-level composition and rendering innovations like vector animations, effects, shadows and lighting.

Easier "à la carte" desktop development
WinUI 3 will let you more easily mix and match the right combination of:

Language: .NET (C#, Visual Basic), C++
App model: UWP, Win32
Packaging: MSIX, AppX for the Microsoft Store, unpackaged
Interop: use WinUI 3 to extend existing WPF, WinForms and MFC apps with modern Fluent UI
Backward compatibility for new features
New WinUI features will continue to be backward-compatible with a wide range of Windows versions: you can start building and shipping apps with new features immediately as soon as they're released, without having to wait for your users to update Windows.

Native development support
WinUI can be used with .NET, but doesn't depend on .NET: WinUI is 100% C++ and can be used in unmanaged Windows apps, for example using standard C++17 via C++/WinRT.

More frequent updates
WinUI will continue to ship new stable versions 3x per year, with monthly prerelease builds.

Open source development and community engagement
WinUI will continue to be developed as an open source project on GitHub. WinUI 2 is already open source in this repo, and we plan to add the full WinUI 3 Xaml framework.
You can engage directly with Microsoft's core engineering team and contribute bug reports, feature ideas, and even code: see the Contribution Guide for more info.
You can also try out the monthly prerelease builds to see new in-development features and help shape their final form.

A native Windows target for web and cross-platform frameworks
WinUI 3 is better optimized for libraries and frameworks to build on.
For example, we're planning to base the new high-performance C++ React Native Windows implementation on WinUI 3.

New Features in WinUI 3.0
Our primary focus for WinUI 3.0 is to decouple the UWP UI framework (Xaml, composition and input) while maintaining high compatibility with existing UWP APIs and behaviors to help make the update to WinUI 3.0 easy for existing UWP apps.

This means we won't be adding many new features in the first WinUI 3.0 release.

However, we are planning at least a few new features, including:

Downlevel support (backward compatibility) for all existing features: new Xaml and Composition features that were added in the Windows May 2019 Update will now work on Creators Update and newer!
A new Microsoft Edge (Chromium) WebView Xaml control
Input validation support
New Visual Studio 2019 app templates for different combinations of app type (Win32, UWP) and language (.NET, C++)
Updating your apps to use WinUI 3.0
Creating a new WinUI app will be easy using the new Visual Studio 2019 project templates.

It should also be straightforward to add WinUI views to existing Win32 apps using Xaml Islands.

For existing UWP Xaml apps there will be some updates required when migrating to WinUI 3.0.

We'd love to hear your thoughts on the developer experience in the WinUI 3.0 tooling discussion issue.

WinUI 3.0 Timelines and Milestones
We're planning to release WinUI 3.0 in 2020. The next major milestones we're working toward are:

Alpha release: we plan to release an early alpha version of WinUI 3.0 in Q4 2019 for testing and feedback. It will be missing functionality

Open sourcing: the next main focus area after the first alpha release is getting the full WinUI 3 Xaml platform migrated to open source development on GitHub in this repo

Preview release: we're planning to release a more complete preview in the first half of 2020