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Experimental interface IBehavior #32350

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7a3ed80
Experimental interface IBehavior
stephenquan Nov 3, 2025
af3d837
Enable AttachedCollection<IBehavior>
stephenquan Nov 12, 2025
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2 changes: 1 addition & 1 deletion src/Controls/src/Core/Interactivity/AttachedCollection.cs
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Expand Up @@ -5,7 +5,7 @@

namespace Microsoft.Maui.Controls
{
internal class AttachedCollection<T> : ObservableCollection<T>, ICollection<T>, IAttachedObject where T : BindableObject, IAttachedObject
internal class AttachedCollection<T> : ObservableCollection<T>, ICollection<T>, IAttachedObject where T : IAttachedObject
{
readonly WeakList<BindableObject> _associatedObjects = new();

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4 changes: 2 additions & 2 deletions src/Controls/src/Core/Interactivity/Behavior.cs
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Expand Up @@ -7,7 +7,7 @@ namespace Microsoft.Maui.Controls
/// Base class for generalized user-defined behaviors that can respond to arbitrary conditions and events.
/// </summary>
/// <remarks>Application developers should specialize the <see cref="Behavior{T}" /> generic class, instead of directly using <see cref="Behavior" />.</remarks>
public abstract class Behavior : BindableObject, IAttachedObject
public abstract class Behavior : BindableObject, IBehavior
{
/// <summary>
/// Creates a new <see cref="Behavior" /> with default values.
Expand Down Expand Up @@ -54,7 +54,7 @@ protected virtual void OnDetachingFrom(BindableObject bindable)

/// <inheritdoc/>
/// <typeparam name="T">The type of object this behavior will be applied to.</typeparam>
public abstract class Behavior<T> : Behavior where T : BindableObject
public abstract class Behavior<T> : Behavior, IBehavior<T> where T : BindableObject
{
/// <inheritdoc/>
protected Behavior() : base(typeof(T))
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20 changes: 19 additions & 1 deletion src/Controls/src/Core/Interactivity/IAttachedObject.cs
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@@ -1,9 +1,27 @@
#nullable disable
namespace Microsoft.Maui.Controls
{
internal interface IAttachedObject

/// <summary>
/// Defines a contract for objects that can be attached to a <see cref="BindableObject"/>.
/// This interface is typically implemented by behaviors or effects that need to interact with
/// the lifecycle or properties of a visual element in the UI.
/// </summary>
public interface IAttachedObject
{

/// <summary>
/// Attaches the object to the specified <see cref="BindableObject"/>.
/// This method is called when the object is added to the visual tree.
/// </summary>
/// <param name="bindable">The <see cref="BindableObject"/> to attach to.</param>
void AttachTo(BindableObject bindable);

/// <summary>
/// Detaches the object from the specified <see cref="BindableObject"/>.
/// This method is called when the object is removed from the visual tree.
/// </summary>
/// <param name="bindable">The <see cref="BindableObject"/> to detach from.</param>
void DetachFrom(BindableObject bindable);
}
}
22 changes: 22 additions & 0 deletions src/Controls/src/Core/Interactivity/IBehavior.cs
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@@ -0,0 +1,22 @@
#nullable disable
using System.ComponentModel;

namespace Microsoft.Maui.Controls
{

/// <summary>
/// Represents a behavior that can be attached to a <see cref="BindableObject"/>.
/// </summary>
public interface IBehavior : INotifyPropertyChanged, IAttachedObject
{
}

/// <summary>
/// Represents a behavior that can be attached to a specific type of <see cref="BindableObject"/>.
/// This generic interface allows behaviors to be strongly typed to the target element.
/// </summary>
/// <typeparam name="T">The type of <see cref="BindableObject"/> the behavior can attach to.</typeparam>
public interface IBehavior<T> : IBehavior where T : BindableObject
{
}
}
7 changes: 6 additions & 1 deletion src/Controls/src/Core/PublicAPI/net-android/PublicAPI.Shipped.txt
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Expand Up @@ -632,6 +632,9 @@
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(System.Uri appLinkUri) -> void
~Microsoft.Maui.Controls.IAppLinks.RegisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAttachedObject.AttachTo(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IAttachedObject.DetachFrom(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IBehavior<T>
~Microsoft.Maui.Controls.IBindableLayout.Children.get -> System.Collections.IList
~Microsoft.Maui.Controls.IBorderElement.Background.get -> Microsoft.Maui.Controls.Brush
~Microsoft.Maui.Controls.IBorderElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
Expand Down Expand Up @@ -1816,7 +1819,7 @@
~Microsoft.Maui.Controls.VisualElement.Background.set -> void
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.set -> void
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.Behavior>
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.IBehavior>
~Microsoft.Maui.Controls.VisualElement.Clip.get -> Microsoft.Maui.Controls.Shapes.Geometry
~Microsoft.Maui.Controls.VisualElement.Clip.set -> void
~Microsoft.Maui.Controls.VisualElement.Resources.get -> Microsoft.Maui.Controls.ResourceDictionary
Expand Down Expand Up @@ -5239,6 +5242,8 @@ Microsoft.Maui.Controls.IAppLinkEntry
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.get -> bool
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.set -> void
Microsoft.Maui.Controls.IAppLinks
Microsoft.Maui.Controls.IAttachedObject
Microsoft.Maui.Controls.IBehavior
Microsoft.Maui.Controls.IBindableLayout
Microsoft.Maui.Controls.IBorderElement
Microsoft.Maui.Controls.IBorderElement.BorderWidth.get -> double
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7 changes: 6 additions & 1 deletion src/Controls/src/Core/PublicAPI/net-ios/PublicAPI.Shipped.txt
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Expand Up @@ -665,6 +665,9 @@
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(System.Uri appLinkUri) -> void
~Microsoft.Maui.Controls.IAppLinks.RegisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAttachedObject.AttachTo(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IAttachedObject.DetachFrom(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IBehavior<T>
~Microsoft.Maui.Controls.IBindableLayout.Children.get -> System.Collections.IList
~Microsoft.Maui.Controls.IBorderElement.Background.get -> Microsoft.Maui.Controls.Brush
~Microsoft.Maui.Controls.IBorderElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
Expand Down Expand Up @@ -1824,7 +1827,7 @@
~Microsoft.Maui.Controls.VisualElement.Background.set -> void
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.set -> void
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.Behavior>
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.IBehavior>
~Microsoft.Maui.Controls.VisualElement.Clip.get -> Microsoft.Maui.Controls.Shapes.Geometry
~Microsoft.Maui.Controls.VisualElement.Clip.set -> void
~Microsoft.Maui.Controls.VisualElement.Resources.get -> Microsoft.Maui.Controls.ResourceDictionary
Expand Down Expand Up @@ -5435,6 +5438,8 @@ Microsoft.Maui.Controls.IAppLinkEntry
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.get -> bool
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.set -> void
Microsoft.Maui.Controls.IAppLinks
Microsoft.Maui.Controls.IAttachedObject
Microsoft.Maui.Controls.IBehavior
Microsoft.Maui.Controls.IBindableLayout
Microsoft.Maui.Controls.IBorderElement
Microsoft.Maui.Controls.IBorderElement.BorderWidth.get -> double
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7 changes: 6 additions & 1 deletion src/Controls/src/Core/PublicAPI/net-maccatalyst/PublicAPI.Shipped.txt
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Expand Up @@ -665,6 +665,9 @@
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(System.Uri appLinkUri) -> void
~Microsoft.Maui.Controls.IAppLinks.RegisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAttachedObject.AttachTo(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IAttachedObject.DetachFrom(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IBehavior<T>
~Microsoft.Maui.Controls.IBindableLayout.Children.get -> System.Collections.IList
~Microsoft.Maui.Controls.IBorderElement.Background.get -> Microsoft.Maui.Controls.Brush
~Microsoft.Maui.Controls.IBorderElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
Expand Down Expand Up @@ -1824,7 +1827,7 @@
~Microsoft.Maui.Controls.VisualElement.Background.set -> void
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.set -> void
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.Behavior>
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.IBehavior>
~Microsoft.Maui.Controls.VisualElement.Clip.get -> Microsoft.Maui.Controls.Shapes.Geometry
~Microsoft.Maui.Controls.VisualElement.Clip.set -> void
~Microsoft.Maui.Controls.VisualElement.Resources.get -> Microsoft.Maui.Controls.ResourceDictionary
Expand Down Expand Up @@ -5435,6 +5438,8 @@ Microsoft.Maui.Controls.IAppLinkEntry
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.get -> bool
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.set -> void
Microsoft.Maui.Controls.IAppLinks
Microsoft.Maui.Controls.IAttachedObject
Microsoft.Maui.Controls.IBehavior
Microsoft.Maui.Controls.IBindableLayout
Microsoft.Maui.Controls.IBorderElement
Microsoft.Maui.Controls.IBorderElement.BorderWidth.get -> double
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2 changes: 1 addition & 1 deletion src/Controls/src/Core/PublicAPI/net-tizen/PublicAPI.Shipped.txt
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Expand Up @@ -1594,7 +1594,7 @@
~Microsoft.Maui.Controls.VisualElement.Background.set -> void
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.set -> void
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.Behavior>
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.IBehavior>
~Microsoft.Maui.Controls.VisualElement.Clip.get -> Microsoft.Maui.Controls.Shapes.Geometry
~Microsoft.Maui.Controls.VisualElement.Clip.set -> void
~Microsoft.Maui.Controls.VisualElement.Resources.get -> Microsoft.Maui.Controls.ResourceDictionary
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7 changes: 6 additions & 1 deletion src/Controls/src/Core/PublicAPI/net-windows/PublicAPI.Shipped.txt
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Expand Up @@ -535,6 +535,9 @@
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(System.Uri appLinkUri) -> void
~Microsoft.Maui.Controls.IAppLinks.RegisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAttachedObject.AttachTo(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IAttachedObject.DetachFrom(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IBehavior<T>
~Microsoft.Maui.Controls.IBindableLayout.Children.get -> System.Collections.IList
~Microsoft.Maui.Controls.IBorderElement.Background.get -> Microsoft.Maui.Controls.Brush
~Microsoft.Maui.Controls.IBorderElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
Expand Down Expand Up @@ -1664,7 +1667,7 @@
~Microsoft.Maui.Controls.VisualElement.Background.set -> void
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.set -> void
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.Behavior>
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.IBehavior>
~Microsoft.Maui.Controls.VisualElement.Clip.get -> Microsoft.Maui.Controls.Shapes.Geometry
~Microsoft.Maui.Controls.VisualElement.Clip.set -> void
~Microsoft.Maui.Controls.VisualElement.Resources.get -> Microsoft.Maui.Controls.ResourceDictionary
Expand Down Expand Up @@ -4904,6 +4907,8 @@ Microsoft.Maui.Controls.IAppLinkEntry
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.get -> bool
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.set -> void
Microsoft.Maui.Controls.IAppLinks
Microsoft.Maui.Controls.IAttachedObject
Microsoft.Maui.Controls.IBehavior
Microsoft.Maui.Controls.IBindableLayout
Microsoft.Maui.Controls.IBorderElement
Microsoft.Maui.Controls.IBorderElement.BorderWidth.get -> double
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7 changes: 6 additions & 1 deletion src/Controls/src/Core/PublicAPI/net/PublicAPI.Shipped.txt
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Expand Up @@ -517,6 +517,9 @@
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(System.Uri appLinkUri) -> void
~Microsoft.Maui.Controls.IAppLinks.RegisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAttachedObject.AttachTo(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IAttachedObject.DetachFrom(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IBehavior<T>
~Microsoft.Maui.Controls.IBindableLayout.Children.get -> System.Collections.IList
~Microsoft.Maui.Controls.IBorderElement.Background.get -> Microsoft.Maui.Controls.Brush
~Microsoft.Maui.Controls.IBorderElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
Expand Down Expand Up @@ -1590,7 +1593,7 @@
~Microsoft.Maui.Controls.VisualElement.Background.set -> void
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.set -> void
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.Behavior>
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.IBehavior>
~Microsoft.Maui.Controls.VisualElement.Clip.get -> Microsoft.Maui.Controls.Shapes.Geometry
~Microsoft.Maui.Controls.VisualElement.Clip.set -> void
~Microsoft.Maui.Controls.VisualElement.Resources.get -> Microsoft.Maui.Controls.ResourceDictionary
Expand Down Expand Up @@ -4660,6 +4663,8 @@ Microsoft.Maui.Controls.IAppLinkEntry
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.get -> bool
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.set -> void
Microsoft.Maui.Controls.IAppLinks
Microsoft.Maui.Controls.IAttachedObject
Microsoft.Maui.Controls.IBehavior
Microsoft.Maui.Controls.IBindableLayout
Microsoft.Maui.Controls.IBorderElement
Microsoft.Maui.Controls.IBorderElement.BorderWidth.get -> double
Expand Down
7 changes: 6 additions & 1 deletion src/Controls/src/Core/PublicAPI/netstandard/PublicAPI.Shipped.txt
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Expand Up @@ -517,6 +517,9 @@
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAppLinks.DeregisterLink(System.Uri appLinkUri) -> void
~Microsoft.Maui.Controls.IAppLinks.RegisterLink(Microsoft.Maui.Controls.IAppLinkEntry appLink) -> void
~Microsoft.Maui.Controls.IAttachedObject.AttachTo(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IAttachedObject.DetachFrom(Microsoft.Maui.Controls.BindableObject bindable) -> void
~Microsoft.Maui.Controls.IBehavior<T>
~Microsoft.Maui.Controls.IBindableLayout.Children.get -> System.Collections.IList
~Microsoft.Maui.Controls.IBorderElement.Background.get -> Microsoft.Maui.Controls.Brush
~Microsoft.Maui.Controls.IBorderElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
Expand Down Expand Up @@ -1590,7 +1593,7 @@
~Microsoft.Maui.Controls.VisualElement.Background.set -> void
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.get -> Microsoft.Maui.Graphics.Color
~Microsoft.Maui.Controls.VisualElement.BackgroundColor.set -> void
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.Behavior>
~Microsoft.Maui.Controls.VisualElement.Behaviors.get -> System.Collections.Generic.IList<Microsoft.Maui.Controls.IBehavior>
~Microsoft.Maui.Controls.VisualElement.Clip.get -> Microsoft.Maui.Controls.Shapes.Geometry
~Microsoft.Maui.Controls.VisualElement.Clip.set -> void
~Microsoft.Maui.Controls.VisualElement.Resources.get -> Microsoft.Maui.Controls.ResourceDictionary
Expand Down Expand Up @@ -4660,6 +4663,8 @@ Microsoft.Maui.Controls.IAppLinkEntry
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.get -> bool
Microsoft.Maui.Controls.IAppLinkEntry.IsLinkActive.set -> void
Microsoft.Maui.Controls.IAppLinks
Microsoft.Maui.Controls.IAttachedObject
Microsoft.Maui.Controls.IBehavior
Microsoft.Maui.Controls.IBindableLayout
Microsoft.Maui.Controls.IBorderElement
Microsoft.Maui.Controls.IBorderElement.BorderWidth.get -> double
Expand Down
10 changes: 5 additions & 5 deletions src/Controls/src/Core/VisualElement/VisualElement.cs
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Expand Up @@ -389,10 +389,10 @@ public override void Unsubscribe()
}
}

internal static readonly BindablePropertyKey BehaviorsPropertyKey = BindableProperty.CreateReadOnly(nameof(Behaviors), typeof(IList<Behavior>), typeof(VisualElement), default(IList<Behavior>),
internal static readonly BindablePropertyKey BehaviorsPropertyKey = BindableProperty.CreateReadOnly(nameof(Behaviors), typeof(IList<IBehavior>), typeof(VisualElement), default(IList<IBehavior>),
defaultValueCreator: bindable =>
{
var collection = new AttachedCollection<Behavior>();
var collection = new AttachedCollection<IBehavior>();
collection.AttachTo(bindable);
return collection;
});
Expand Down Expand Up @@ -567,11 +567,11 @@ public Brush Background
}

/// <summary>
/// Gets the list of <see cref="Behavior"/> objects associated to this element. This is a read-only bindable property.
/// Gets the list of <see cref="IBehavior"/> objects associated to this element. This is a read-only bindable property.
/// </summary>
public IList<Behavior> Behaviors
public IList<IBehavior> Behaviors
{
get { return (IList<Behavior>)GetValue(BehaviorsProperty); }
get { return (IList<IBehavior>)GetValue(BehaviorsProperty); }
}

/// <summary>
Expand Down