PlusUi.droid 10.0.0.1

PlusUi

A fully cross-platform UI Framework for .NET, delivering consistent user experiences across iOS, Android, Windows, Mac, and Linux. Built with SkiaSharp as the rendering layer, PlusUi ensures that all platforms look, feel, and behave exactly the same.

Documentation | NuGet Packages

Supported Platforms

Platform	Package	Status	NuGet
Windows	PlusUi.desktop	✅ Stable
macOS	PlusUi.desktop	✅ Stable
Linux	PlusUi.desktop	✅ Stable
Web	PlusUi.web	🚧 In Development
iOS	PlusUi.ios	🚧 In Development
Android	PlusUi.droid	🚧 In Development
Headless	PlusUi.headless	🚧 In Development
Video Rendering	PlusUi.h264	✅ Stable

Core Library: (Required by all platforms)

Quick Start

Prerequisites

• .NET 9.0 SDK
• Windows: Windows 11 or later
• Android: Android 8.0 (API 26) or later
• iOS: iOS 11 or later
• Linux/Mac: No specific version requirements

Installation

Install the PlusUi packages via NuGet:

# For Desktop applications (Windows, Mac, Linux)
dotnet add package PlusUi.core
dotnet add package PlusUi.desktop

# For Web (Blazor WebAssembly)
dotnet add package PlusUi.core
dotnet add package PlusUi.web

# For iOS
dotnet add package PlusUi.core
dotnet add package PlusUi.ios

# For Android
dotnet add package PlusUi.core
dotnet add package PlusUi.droid

# For Headless (server-side rendering, testing, automation)
dotnet add package PlusUi.core
dotnet add package PlusUi.headless

# For Video Rendering (H264)
dotnet add package PlusUi.core
dotnet add package PlusUi.h264

Hello World Example

Create a simple counter application:

App.cs

using Microsoft.Extensions.Hosting;
using PlusUi.core;

namespace MyFirstApp;

public class App : IAppConfiguration
{
    public void ConfigureWindow(PlusUiConfiguration config)
    {
        config.Title = "My First PlusUi App";
        config.Size = new SizeI(800, 600);
    }

    public void ConfigureApp(HostApplicationBuilder builder)
    {
        // Register your pages
        builder.AddPage<MainPage>().WithViewModel<MainPageViewModel>();
    }

    public UiPageElement GetRootPage(IServiceProvider serviceProvider)
    {
        return serviceProvider.GetRequiredService<MainPage>();
    }
}

MainPage.cs

using PlusUi.core;
using SkiaSharp;

namespace MyFirstApp;

public class MainPage(MainPageViewModel vm) : UiPageElement(vm)
{
    protected override UiElement Build()
    {
        return new VStack(
            // Label showing the counter
            new Label()
                .SetText("Counter App")
                .SetTextSize(32)
                .SetTextColor(SKColors.White)
                .SetHorizontalTextAlignment(HorizontalTextAlignment.Center)
                .SetMargin(new Margin(0, 20)),

            // Display current count with data binding
            new Label()
                .BindText(nameof(vm.Count), () => $"Count: {vm.Count}")
                .SetTextSize(24)
                .SetTextColor(SKColors.LightGray)
                .SetHorizontalTextAlignment(HorizontalTextAlignment.Center)
                .SetMargin(new Margin(0, 10)),

            // Button to increment counter
            new Button()
                .SetText("Click Me!")
                .SetPadding(new Margin(20, 10))
                .SetBackground(new SolidColorBackground(SKColors.DodgerBlue))
                .SetCornerRadius(8)
                .SetCommand(vm.IncrementCommand)
                .SetMargin(new Margin(20))
        ).SetHorizontalAlignment(HorizontalAlignment.Center)
         .SetVerticalAlignment(VerticalAlignment.Center);
    }
}

MainPageViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

namespace MyFirstApp;

public partial class MainPageViewModel : ObservableObject
{
    public int Count
    {
        get => field;
        set => SetProperty(ref field, value);
    }

    [RelayCommand]
    private void Increment()
    {
        Count++;
    }
}

Build and Run

# Build the solution
dotnet build

# Run on Desktop
dotnet run --project YourDesktopProject

# Run tests
dotnet test

For more examples, explore the samples/Sandbox project in this repository.

Why Choose PlusUi?

True Visual Consistency

Unlike frameworks that adapt to native controls, PlusUi renders identically across all platforms through SkiaSharp. What you design is exactly what users see, regardless of device.

Simple Programming Model

Clean, intuitive MVVM binding with a pure C# approach. No XAML to learn, no complex markup languages - just straightforward code that's familiar to .NET developers.

Fluent API Design

Method chaining makes UI construction readable and maintainable:

new Button()
    .SetText("Save")
    .SetIcon("save.png")
    .SetPadding(new Margin(15, 10))
    .SetBackground(new SolidColorBackground(SKColors.ForestGreen))
    .SetCornerRadius(8)
    .SetCommand(vm.SaveCommand)

Freedom from Platform Limitations

By using a consistent rendering approach, PlusUi isn't constrained by platform-specific UI capabilities or limitations.

Features

UI Components

• Layouts: VStack, HStack, Grid, ScrollView, Border
• Controls: Label, Button, Entry, Checkbox, Image
• Custom Drawing: Solid, UserControl, RawUserControl
• Lists: ItemsList for dynamic, data-bound lists

Styling & Theming

• Solid colors, linear gradients, radial gradients, multi-stop gradients
• Corner radius, borders (solid, dashed, dotted)
• Shadows with customizable blur and offset
• Custom fonts with FontRegistryService
• Theme support with IApplicationStyle

Data Binding

• Two-way MVVM binding
• Property change notifications
• Command binding with parameters
• Uses CommunityToolkit.Mvvm

Navigation & Popups

• Page-based navigation with INavigationService
• Modal popups with IPopupService
• Configurable popup behavior (background click, escape key)

Cross-Platform Input

• Mouse and touch input
• Keyboard support with customizable handlers
• Scroll gestures

Asset Loading

• Local images (embedded resources)
• Web images (async loading with caching)
• Custom fonts

Video Rendering (PlusUi.h264)

The PlusUi.h264 package provides a unique capability: rendering your PlusUi application directly to an H264 video file. This is perfect for creating animated demos, promotional videos, tutorials, or any scenario where you need to convert your UI into video format.

Features

• Video Output: Renders UI to MP4 files with configurable resolution, frame rate, and duration
• Audio Support: Synchronize audio tracks with your UI animations using AudioDefinition
• Animation System: Built-in animation support for smooth transitions
• FFmpeg Integration: Includes FFmpeg binaries for Windows, macOS, and Linux
• Progress Tracking: Real-time rendering progress with Spectre.Console

Example Usage

VideoApp.cs

using Microsoft.Extensions.Hosting;
using PlusUi.core;
using PlusUi.h264;

public class VideoApp : IVideoAppConfiguration
{
    public void ConfigureVideo(VideoConfiguration config)
    {
        config.Width = 1920;
        config.Height = 1080;
        config.OutputFilePath = "output.mp4";
        config.FrameRate = 60;
        config.Duration = TimeSpan.FromSeconds(10);
    }

    public void ConfigureApp(HostApplicationBuilder builder)
    {
        builder.AddPage<MainPage>().WithViewModel<MainPageViewModel>();
        builder.StylePlusUi<MyCustomStyle>();
    }

    public UiPageElement GetRootPage(IServiceProvider serviceProvider)
    {
        return serviceProvider.GetRequiredService<MainPage>();
    }

    public IAudioSequenceProvider? GetAudioSequenceProvider(IServiceProvider serviceProvider)
    {
        // Return null for no audio, or implement IAudioSequenceProvider
        return null;
    }
}

Program.cs

using PlusUi.h264;

var app = new PlusUiApp(args);
app.CreateApp(builder => new VideoApp());

Adding Audio

Implement IAudioSequenceProvider to add synchronized audio:

public class MyAudioProvider : IAudioSequenceProvider
{
    public IEnumerable<AudioDefinition> GetAudioSequence()
    {
        yield return new AudioDefinition(
            FilePath: "background-music.mp3",
            StartTime: TimeSpan.Zero,
            Volume: 0.8f
        );

        yield return new AudioDefinition(
            FilePath: "sound-effect.wav",
            StartTime: TimeSpan.FromSeconds(2.5),
            Volume: 1.0f
        );
    }
}

Use Cases

• Promotional Videos: Create product demos and marketing materials
• Tutorials: Generate step-by-step tutorial videos
• Automated Testing: Record UI test runs
• Documentation: Visual documentation of UI features
• Social Media: Export UI animations for social media posts

Examples

The following example demonstrates how PlusUi code translates into UI. This shows the complete flow from code to visual output:

1. Page Definition

2. ViewModel

3. Styling

4. Resulting UI

For more examples and interactive demos, explore the samples/Sandbox project in this repository.

Building from Source

Clone the Repository

git clone https://github.com/BernhardPollerspoeck/PlusUi.git
cd PlusUi

Build Commands

# Build entire solution
dotnet build PlusUi.sln

# Build with minimal output
dotnet build PlusUi.sln -v q

# Run all tests
dotnet test PlusUi.sln

# Run a specific test
dotnet test PlusUi.sln --filter "FullyQualifiedName~UiPlus.core.Tests.LabelTests"

Project Structure

PlusUi/
├── source/
│   ├── PlusUi.core/          # Core framework (cross-platform)
│   ├── PlusUi.desktop/       # Desktop implementation
│   ├── PlusUi.ios/           # iOS implementation
│   ├── PlusUi.droid/         # Android implementation
│   └── PlusUi.SourceGenerators/  # Code generation tools
├── samples/
│   └── Sandbox/              # Example application
└── tests/
    └── UiPlus.core.Tests/    # Unit tests

Roadmap

We're actively working on the following features for upcoming releases:

Planned Features

• GridControl Enhancement: Advanced grid capabilities with sorting and filtering
• dotnet new Templates: Quick project scaffolding with dotnet new plusui
• Rendering Optimization: Internal rendering engine improvements for better performance

Future Considerations

• Additional UI controls (DatePicker, Slider, ProgressBar)
• Animation framework
• Accessibility improvements
• Hot reload enhancements

Want to see something specific? Open an issue and let us know!

Technical Architecture

PlusUi implements a custom UI framework with a clean separation of concerns:

Core Rendering Pipeline

1. SkiaSharp Rendering Layer: All rendering is handled by SkiaSharp, providing direct access to the 2D graphics canvas. This ensures consistent visual output across all platforms.

2. Custom Layout Engine: The framework implements a measurement and arrangement system similar to WPF/MAUI, where every UI element:

   • Measures its desired size based on content and constraints
   • Arranges itself and its children within an allocated space
   • Supports flexible layouts with alignment, margins, and padding

3. Platform Abstraction: Platform-specific hosts (Desktop, iOS, Android) provide:

   • Window/View creation and management
   • Input event handling (mouse, touch, keyboard)
   • Integration with SkiaSharp's rendering context

Component Model

• Base Elements: All UI components inherit from UiElement or UiLayoutElement
• Pages: Top-level containers inherit from UiPageElement
• Data Binding: Property change notifications integrated with MVVM pattern
• Fluent API: Method chaining with .Set*() methods for readable UI construction

This architecture allows PlusUi to deliver consistent user experiences across platforms while maintaining flexibility and performance.

Community & Support

Join our Discord community to get support, share feedback, or discuss your experiences with PlusUi:

Contributing

We welcome all contributions! Whether it's fixing a typo, improving documentation, reporting bugs, or implementing new features - every contribution matters and is appreciated.

Please read our Contributing Guide before submitting a pull request. It contains important information about our PR requirements, including our test-first approach that helps ensure changes can be reviewed and merged efficiently.

Quick Overview:

• Open an issue first to discuss significant changes
• For bug fixes: first commit with failing tests, then the fix
• Follow the project's coding standards (see CLAUDE.md)
• Keep PRs focused and manageable

Thank you for helping make PlusUi better!

License

This project is licensed under the MIT License - see the LICENSE file for details.

The MIT License allows for wide usage and contribution while remaining open and accessible to developers.

About the Project

After years of working with various cross-platform UI frameworks and encountering inconsistencies between platforms, PlusUi was born from curiosity: what if consistency was the absolute priority? This project represents a journey to create something where what you design is exactly what users see, regardless of device.