From 0d53d641ea082e58c6e9863cd53105264a4a9e94 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Wies=C5=82aw=20S=CC=8Colte=CC=81s?=
 <wieslaw.soltes@gmail.com>
Date: Sat, 4 Jan 2025 22:42:37 +0100
Subject: [PATCH] Add new custom reactive event behaviors

---
 .../Core/ActualThemeVariantChangedBehavior.cs | 31 +++++++++++++++++++
 .../Core/DataContextChangedBehavior.cs        | 31 +++++++++++++++++++
 .../Core/InitializedBehavior.cs               | 31 +++++++++++++++++++
 .../Core/ResourcesChangedBehavior.cs          | 31 +++++++++++++++++++
 4 files changed, 124 insertions(+)
 create mode 100644 src/Avalonia.Xaml.Interactions.Custom/Core/ActualThemeVariantChangedBehavior.cs
 create mode 100644 src/Avalonia.Xaml.Interactions.Custom/Core/DataContextChangedBehavior.cs
 create mode 100644 src/Avalonia.Xaml.Interactions.Custom/Core/InitializedBehavior.cs
 create mode 100644 src/Avalonia.Xaml.Interactions.Custom/Core/ResourcesChangedBehavior.cs

diff --git a/src/Avalonia.Xaml.Interactions.Custom/Core/ActualThemeVariantChangedBehavior.cs b/src/Avalonia.Xaml.Interactions.Custom/Core/ActualThemeVariantChangedBehavior.cs
new file mode 100644
index 000000000..4f2e924e4
--- /dev/null
+++ b/src/Avalonia.Xaml.Interactions.Custom/Core/ActualThemeVariantChangedBehavior.cs
@@ -0,0 +1,31 @@
+using System.Reactive.Disposables;
+using Avalonia.Xaml.Interactivity;
+
+namespace Avalonia.Xaml.Interactions.Custom;
+
+/// <summary>
+/// A base class for behaviors using ActualThemeVariantChanged event.
+/// </summary>
+/// <typeparam name="T"></typeparam>
+public abstract class ActualThemeVariantChangedBehavior<T> : DisposingBehavior<T> where T : StyledElement
+{
+    private CompositeDisposable? _disposables;
+
+    /// <inheritdoc />
+    protected override void OnAttached(CompositeDisposable disposables)
+    {
+        _disposables = disposables;
+    }
+
+    /// <inheritdoc />
+    protected override void OnActualThemeVariantChangedEvent()
+    {
+        OnActualThemeVariantChangedEvent(_disposables!);
+    }
+
+    /// <summary>
+    /// Called when the <see cref="StyledElementBehavior{T}.AssociatedObject"/> ActualThemeVariantChanged event is raised.
+    /// </summary>
+    /// <param name="disposable">The group of disposable resources that are disposed together</param>
+    protected abstract void OnActualThemeVariantChangedEvent(CompositeDisposable disposable);
+}
diff --git a/src/Avalonia.Xaml.Interactions.Custom/Core/DataContextChangedBehavior.cs b/src/Avalonia.Xaml.Interactions.Custom/Core/DataContextChangedBehavior.cs
new file mode 100644
index 000000000..bceaf1d1e
--- /dev/null
+++ b/src/Avalonia.Xaml.Interactions.Custom/Core/DataContextChangedBehavior.cs
@@ -0,0 +1,31 @@
+using System.Reactive.Disposables;
+using Avalonia.Xaml.Interactivity;
+
+namespace Avalonia.Xaml.Interactions.Custom;
+
+/// <summary>
+/// A base class for behaviors using DataContextChanged event.
+/// </summary>
+/// <typeparam name="T"></typeparam>
+public abstract class DataContextChangedBehavior<T> : DisposingBehavior<T> where T : StyledElement
+{
+    private CompositeDisposable? _disposables;
+
+    /// <inheritdoc />
+    protected override void OnAttached(CompositeDisposable disposables)
+    {
+        _disposables = disposables;
+    }
+
+    /// <inheritdoc />
+    protected override void OnDataContextChangedEvent()
+    {
+        OnDataContextChangedEvent(_disposables!);
+    }
+
+    /// <summary>
+    /// Called when the <see cref="StyledElementBehavior{T}.AssociatedObject"/> DataContextChanged event is raised.
+    /// </summary>
+    /// <param name="disposable">The group of disposable resources that are disposed together</param>
+    protected abstract void OnDataContextChangedEvent(CompositeDisposable disposable);
+}
diff --git a/src/Avalonia.Xaml.Interactions.Custom/Core/InitializedBehavior.cs b/src/Avalonia.Xaml.Interactions.Custom/Core/InitializedBehavior.cs
new file mode 100644
index 000000000..7a5e242b2
--- /dev/null
+++ b/src/Avalonia.Xaml.Interactions.Custom/Core/InitializedBehavior.cs
@@ -0,0 +1,31 @@
+using System.Reactive.Disposables;
+using Avalonia.Xaml.Interactivity;
+
+namespace Avalonia.Xaml.Interactions.Custom;
+
+/// <summary>
+/// A base class for behaviors using Initialized event.
+/// </summary>
+/// <typeparam name="T"></typeparam>
+public abstract class InitializedBehavior<T> : DisposingBehavior<T> where T : StyledElement
+{
+    private CompositeDisposable? _disposables;
+
+    /// <inheritdoc />
+    protected override void OnAttached(CompositeDisposable disposables)
+    {
+        _disposables = disposables;
+    }
+
+    /// <inheritdoc />
+    protected override void OnInitializedEvent()
+    {
+        OnInitializedEvent(_disposables!);
+    }
+
+    /// <summary>
+    /// Called when the <see cref="StyledElementBehavior{T}.AssociatedObject"/> Initialized event is raised.
+    /// </summary>
+    /// <param name="disposable">The group of disposable resources that are disposed together</param>
+    protected abstract void OnInitializedEvent(CompositeDisposable disposable);
+}
diff --git a/src/Avalonia.Xaml.Interactions.Custom/Core/ResourcesChangedBehavior.cs b/src/Avalonia.Xaml.Interactions.Custom/Core/ResourcesChangedBehavior.cs
new file mode 100644
index 000000000..b31763100
--- /dev/null
+++ b/src/Avalonia.Xaml.Interactions.Custom/Core/ResourcesChangedBehavior.cs
@@ -0,0 +1,31 @@
+using System.Reactive.Disposables;
+using Avalonia.Xaml.Interactivity;
+
+namespace Avalonia.Xaml.Interactions.Custom;
+
+/// <summary>
+/// A base class for behaviors using ResourcesChanged event.
+/// </summary>
+/// <typeparam name="T"></typeparam>
+public abstract class ResourcesChangedBehavior<T> : DisposingBehavior<T> where T : StyledElement
+{
+    private CompositeDisposable? _disposables;
+
+    /// <inheritdoc />
+    protected override void OnAttached(CompositeDisposable disposables)
+    {
+        _disposables = disposables;
+    }
+
+    /// <inheritdoc />
+    protected override void OnResourcesChangedEvent()
+    {
+        OnResourcesChangedEvent(_disposables!);
+    }
+
+    /// <summary>
+    /// Called when the <see cref="StyledElementBehavior{T}.AssociatedObject"/> ResourcesChanged event is raised.
+    /// </summary>
+    /// <param name="disposable">The group of disposable resources that are disposed together</param>
+    protected abstract void OnResourcesChangedEvent(CompositeDisposable disposable);
+}