DependencyPropertyGenerator

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DependencyPropertyGenerator

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Dependency property, routed event and weak event source generator for WPF/UWP/WinUI/Uno/Avalonia/MAUI platforms.

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# DependencyPropertyGenerator

[![Nuget package](https://img.shields.io/nuget/vpre/DependencyPropertyGenerator)](https://www.nuget.org/packages/DependencyPropertyGenerator/)
[![CI/CD](https://github.com/HavenDV/DependencyPropertyGenerator/actions/workflows/main.yml/badge.svg?branch=main)](https://github.com/HavenDV/DependencyPropertyGenerator/actions/workflows/main.yml)
[![License: MIT](https://img.shields.io/github/license/HavenDV/DependencyPropertyGenerator)](https://github.com/HavenDV/DependencyPropertyGenerator/blob/main/LICENSE.txt)
[![Discord](https://img.shields.io/discord/988253265550532680?label=Discord&logo=discord&logoColor=white&color=d82679)](https://discord.gg/g8u2t9dKgE)

Dependency property, routed event and weak event source generator for WPF/UWP/WinUI/Uno/Avalonia/MAUI platforms.

## Usage
```cs
using DependencyPropertyGenerator;
using System.Windows.Controls;

#nullable enable

namespace H.Generators.IntegrationTests;

[DependencyProperty<bool>("IsSpinning", DefaultValue = true, Category = "Category", Description = "Description")]
public partial class MyControl : UserControl
{
    // Optional
    partial void OnIsSpinningChanged(bool oldValue, bool newValue)
    {
    }
}

[AttachedDependencyProperty<object, TreeView>("SelectedItem", DefaultBindingMode = DefaultBindingMode.TwoWay)]
public static partial class TreeViewExtensions
{
    // Optional
    static partial void OnSelectedItemChanged(TreeView sender, object? oldValue, object? newValue)
    {
    }
}
```
will generate:
```cs
//HintName: MyControl.Properties.IsSpinning.generated.cs

#nullable enable

namespace H.Generators.IntegrationTests
{
    public partial class MyControl
    {
        /// <summary>
        /// Description<br/>
        /// Default value: true
        /// </summary>
        public static readonly global::System.Windows.DependencyProperty IsSpinningProperty =
            global::System.Windows.DependencyProperty.Register(
                name: "IsSpinning",
                propertyType: typeof(bool),
                ownerType: typeof(global::H.Generators.IntegrationTests.MyControl),
                typeMetadata: new global::System.Windows.FrameworkPropertyMetadata(
                    defaultValue: (bool)true,
                    flags: global::System.Windows.FrameworkPropertyMetadataOptions.None,
                    propertyChangedCallback: static (sender, args) =>
                    {
                        ((global::H.Generators.IntegrationTests.MyControl)sender).OnIsSpinningChanged(
                            (bool)args.OldValue,
                            (bool)args.NewValue);
                    },
                    coerceValueCallback: null,
                    isAnimationProhibited: false),
                validateValueCallback: null);

/// <summary>
        /// Description<br/>
        /// Default value: true
        /// </summary>
        [global::System.ComponentModel.Category("Category")]
        [global::System.ComponentModel.Description("Description")]
        public bool IsSpinning
        {
            get => (bool)GetValue(IsSpinningProperty);
            set => SetValue(IsSpinningProperty, value);
        }

partial void OnIsSpinningChanged();
        partial void OnIsSpinningChanged(bool newValue);
        partial void OnIsSpinningChanged(bool oldValue, bool newValue);
    }
}
```
```cs
//HintName: TreeViewExtensions.AttachedProperties.SelectedItem.generated.cs

#nullable enable

namespace H.Generators.IntegrationTests
{
    public static partial class TreeViewExtensions
    {
        /// <summary>
        /// Default value: default(object)
        /// </summary>
        public static readonly global::System.Windows.DependencyProperty SelectedItemProperty =
            global::System.Windows.DependencyProperty.RegisterAttached(
                name: "SelectedItem",
                propertyType: typeof(object),
                ownerType: typeof(global::H.Generators.IntegrationTests.TreeViewExtensions),
                defaultMetadata: new global::System.Windows.FrameworkPropertyMetadata(
                    defaultValue: default(object),
                    flags: global::System.Windows.FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
                    propertyChangedCallback: static (sender, args) =>
                    {
                        OnSelectedItemChanged(
                            (global::System.Windows.Controls.TreeView)sender,
                            (object?)args.OldValue,
                            (object?)args.NewValue);
                    },
                    coerceValueCallback: null,
                    isAnimationProhibited: false),
                validateValueCallback: null);

/// <summary>
        /// Default value: default(object)
        /// </summary>
        public static void SetSelectedItem(global::System.Windows.DependencyObject element, object? value)
        {
            element = element ?? throw new global::System.ArgumentNullException(nameof(element));

element.SetValue(SelectedItemProperty, value);
        }

/// <summary>
        /// Default value: default(object)
        /// </summary>
        [global::System.Windows.AttachedPropertyBrowsableForType(typeof(global::System.Windows.Controls.TreeView))]
        public static object? GetSelectedItem(global::System.Windows.DependencyObject element)
        {
            element = element ?? throw new global::System.ArgumentNullException(nameof(element));

return (object?)element.GetValue(SelectedItemProperty);
        }

static partial void OnSelectedItemChanged();
        static partial void OnSelectedItemChanged(global::System.Windows.Controls.TreeView treeView);
        static partial void OnSelectedItemChanged(global::System.Windows.Controls.TreeView treeView, object? newValue);
        static partial void OnSelectedItemChanged(global::System.Windows.Controls.TreeView treeView, object? oldValue, object? newValue);
    }
}
```

## Advanced usage
### new object/struct() expressions in DefaultValue
While it's [generally not recommended](https://devblogs.microsoft.com/oldnewthing/20191002-00/?p=102950) 
to use new expressions in properties, a generator provides this capability:
```cs
public readonly record struct Data();

[AttachedDependencyProperty<object, TreeView>("SelectedItem", DefaultValueExpression = "new Data()")]
```
If your type is declared outside the namespace of an attribute declaration, 
you will need to specify the full name of the type, including the namespace.

### XML documentation
The easiest way to add documentation is the `Description` parameter.
It will add a `System.ComponentModel.Description` attribute to the property and will also be used in the xml documentation.  
If for some reason you need to save raw xml documentation for your properties, 
there is an option to specify raw xml text for both DependencyProperty and getter/setter 
via `XmlDocumentation`/`PropertyXmlDocumentation` attribute properties.

### Platform detection
For some platforms there is no automatic detection. In these cases, the generator needs a little help by adding:
```xml
  <PropertyGroup>
    <DefineConstants>$(DefineConstants);HAS_UNO</DefineConstants>
    <DefineConstants>$(DefineConstants);HAS_UNO_WINUI</DefineConstants>
    <DefineConstants>$(DefineConstants);HAS_AVALONIA</DefineConstants>
  </PropertyGroup>
```
Automatic detection of Uno [was added in Uno 4.5](https://github.com/unoplatform/uno/pull/9443).

### Bind event
The generator can automatically control properties that depend on events:
```cs
[AttachedDependencyProperty<object, Grid>("BindEventProperty", BindEvent = nameof(Grid.MouseWheel))]
public static partial class GridExtensions
{
    private static void OnBindEventPropertyChanged_MouseWheel(object? sender, System.Windows.Input.MouseWheelEventArgs args)
    {
    }
}
```
will generate additional code:
```cs
static partial void OnBindEventPropertyChanged_BeforeBind(
    global::System.Windows.Controls.Grid sender,
    object? oldValue,
    object? newValue);
static partial void OnBindEventPropertyChanged_AfterBind(
    global::System.Windows.Controls.Grid sender,
    object? oldValue,
    object? newValue);

static partial void OnBindEventPropertyChanged(
    global::System.Windows.Controls.Grid sender,
    object? oldValue,
    object? newValue)
{
    OnBindEventPropertyChanged_BeforeBind(
        sender,
        oldValue,
        newValue);

if (oldValue is not default(object))
    {
        sender.MouseWheel -= OnBindEventPropertyChanged_MouseWheel;
    }
    if (newValue is not default(object))
    {
        sender.MouseWheel += OnBindEventPropertyChanged_MouseWheel;
    }

OnBindEventPropertyChanged_AfterBind(
        sender,
        oldValue,
        newValue);
}
```

### Override metadata
For UWP/WinUI/Uno, a special `RegisterPropertyChangedCallbacks()` method will be created, 
which you will need to call in the constructor to register property change callbacks.

## Notes
To use generic attributes, you need to set up `LangVersion` in your .csproj:
```xml
<LangVersion>preview</LangVersion>
```
There are also non-Generic attributes here.

## Possible features
- [Mutable default values in constructor](https://devblogs.microsoft.com/oldnewthing/20191003-00/?p=102959)

## Support
Priority place for bugs: https://github.com/HavenDV/DependencyPropertyGenerator/issues  
Priority place for ideas and general questions: https://github.com/HavenDV/DependencyPropertyGenerator/discussions  
I also have a Discord support channel:  
https://discord.gg/g8u2t9dKgE

DependencyPropertyGenerator

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