[Breaking change] Enhanced PeekHeight API

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/BottomSheet.cs

@@ -151,12 +151,12 @@ public class BottomSheet : View, IBottomSheet, IElementConfiguration<BottomSheet
     /// <summary>
     /// Bindable property.
     /// </summary>
-    public static readonly BindableProperty PeekProperty =
+    public static readonly BindableProperty PeekHeightProperty =
         BindableProperty.Create(
-            nameof(Peek),
-            typeof(BottomSheetPeek),
+            nameof(PeekHeight),
+            typeof(double),
             typeof(BottomSheet),
-            propertyChanged: OnPeekChanged);
+            defaultValue: 0.00);
 
     /// <summary>
     /// Bindable property.
@@ -183,7 +183,7 @@ public class BottomSheet : View, IBottomSheet, IElementConfiguration<BottomSheet
     /// </summary>
     public static readonly BindableProperty PaddingProperty =
         BindableProperty.Create(
-            nameof(Peek),
+            nameof(Padding),
             typeof(Thickness),
             typeof(BottomSheet),
             defaultValue: new Thickness(5));
@@ -329,7 +329,7 @@ public event EventHandler Opened
     public Color WindowBackgroundColor { get => (Color)GetValue(WindowBackgroundColorProperty); set => SetValue(WindowBackgroundColorProperty, value); }
 
     /// <inheritdoc/>
-    public BottomSheetPeek? Peek { get => (BottomSheetPeek?)GetValue(PeekProperty); set => SetValue(PeekProperty, value); }
+    public double PeekHeight { get => (double)GetValue(PeekHeightProperty); set => SetValue(PeekHeightProperty, value); }
 
     /// <inheritdoc/>
     public BottomSheetHeader? Header { get => (BottomSheetHeader?)GetValue(HeaderProperty); set => SetValue(HeaderProperty, value); }
@@ -375,6 +375,7 @@ public ICollection<BottomSheetState> States
         set => SetValue(StatesProperty, value);
     }
 
+    /// <inheritdoc/>
     public IPlatformElementConfiguration<T, BottomSheet> On<T>()
         where T : IConfigPlatform
     {
@@ -411,27 +412,6 @@ void IBottomSheet.OnClosedBottomSheet()
     }
 #pragma warning restore CA1033
 
-    /// <inheritdoc/>
-    protected override void OnParentChanged()
-    {
-        base.OnParentChanged();
-
-        if (Header is not null)
-        {
-            Header.Parent = Parent;
-        }
-
-        if (Peek is not null)
-        {
-            Peek.Parent = Parent;
-        }
-
-        if (Content is not null)
-        {
-            Content.Parent = Parent;
-        }
-    }
-
     /// <inheritdoc/>
     protected override void OnBindingContextChanged()
     {
@@ -442,11 +422,6 @@ protected override void OnBindingContextChanged()
             Header.BindingContext = BindingContext;
         }
 
-        if (Peek is not null)
-        {
-            Peek.BindingContext = BindingContext;
-        }
-
         if (Content is not null)
         {
             Content.BindingContext = BindingContext;
@@ -467,9 +442,6 @@ private static void OnStatesPropertyChanged(BindableObject bindable, object oldv
     private static void OnHeaderChanged(BindableObject bindable, object oldvalue, object newvalue)
         => ((BottomSheet)bindable).OnHeaderChanged((BottomSheetHeader)newvalue);
 
-    private static void OnPeekChanged(BindableObject bindable, object oldvalue, object newvalue)
-        => ((BottomSheet)bindable).OnPeekChanged((BottomSheetPeek)newvalue);
-
     private static void OnContentChanged(BindableObject bindable, object oldvalue, object newvalue)
         => ((BottomSheet)bindable).OnContentChanged((BottomSheetContent)newvalue);
 
@@ -501,16 +473,6 @@ private void OnHeaderChanged(BottomSheetHeader newValue)
         }
     }
 
-    private void OnPeekChanged(BottomSheetPeek newValue)
-    {
-        // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
-        if (newValue is not null)
-        {
-            newValue.Parent = this;
-            newValue.BindingContext = BindingContext;
-        }
-    }
-
     private void OnContentChanged(BottomSheetContent newValue)
     {
         // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/BottomSheetPeekBehavior.cs

@@ -0,0 +1,84 @@
+namespace Plugin.Maui.BottomSheet;
+
+/// <inheritdoc />
+public sealed class BottomSheetPeekBehavior : PlatformBehavior<View>
+{
+    #if ANDROID || IOS || MACCATALYST
+    private WeakReference<IBottomSheet>? _weakBottomSheet;
+    #endif
+
+    #if ANDROID
+    /// <inheritdoc/>
+    protected override void OnAttachedTo(View bindable, Android.Views.View platformView)
+    {
+        base.OnAttachedTo(bindable, platformView);
+
+#pragma warning disable CA1062
+        bindable.SizeChanged += ViewOnSizeChanged;
+#pragma warning restore CA1062
+        var bottomSheet = bindable.FindBottomSheet();
+
+        if (bottomSheet is not null)
+        {
+            _weakBottomSheet = new WeakReference<IBottomSheet>(bottomSheet);
+        }
+    }
+
+    /// <inheritdoc/>
+    protected override void OnDetachedFrom(View bindable, Android.Views.View platformView)
+    {
+        base.OnDetachedFrom(bindable, platformView);
+
+#pragma warning disable CA1062
+        bindable.SizeChanged -= ViewOnSizeChanged;
+#pragma warning restore CA1062
+    }
+
+    #elif MACCATALYST || IOS
+    /// <inheritdoc/>
+    protected override void OnAttachedTo(View bindable, UIKit.UIView platformView)
+    {
+        base.OnAttachedTo(bindable, platformView);
+
+        double height = 0.00;
+#pragma warning disable CA1062
+        #if NET9
+        var size = bindable.Measure(double.PositiveInfinity, double.PositiveInfinity);
+        height = size.Height;
+        #elif NET8
+        var size = bindable.Measure(double.PositiveInfinity, double.PositiveInfinity, MeasureFlags.IncludeMargins);
+        height = size.Request.Height;
+        #endif
+        bindable.SizeChanged += ViewOnSizeChanged;
+#pragma warning restore CA1062
+        var bottomSheetPage = bindable.FindBottomSheetPage();
+
+        if (bottomSheetPage?.BottomSheet is not null)
+        {
+            _weakBottomSheet = new WeakReference<IBottomSheet>(bottomSheetPage.BottomSheet);
+            bottomSheetPage.BottomSheet.PeekHeight = height;
+        }
+    }
+
+    /// <inheritdoc/>
+    protected override void OnDetachedFrom(View bindable, UIKit.UIView platformView)
+    {
+        base.OnDetachedFrom(bindable, platformView);
+
+#pragma warning disable CA1062
+        bindable.SizeChanged -= ViewOnSizeChanged;
+#pragma warning restore CA1062
+    }
+    #endif
+
+    #if ANDROID || IOS || MACCATALYST
+    private void ViewOnSizeChanged(object? sender, EventArgs e)
+    {
+        if (sender is View view
+            && _weakBottomSheet?.TryGetTarget(out var bottomSheet) == true)
+        {
+            bottomSheet.PeekHeight = view.Height;
+        }
+    }
+    #endif
+}

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/Handlers/BottomSheetHandler.android.cs

@@ -74,9 +74,9 @@ private static void MapCurrentState(BottomSheetHandler handler, IBottomSheet bot
         handler.PlatformView.SetCurrentState();
     }
 
-    private static void MapPeek(BottomSheetHandler handler, IBottomSheet bottomSheet)
+    private static void MapPeekHeight(BottomSheetHandler handler, IBottomSheet bottomSheet)
     {
-        handler.PlatformView.SetPeek();
+        handler.PlatformView.SetPeekHeight();
     }
 
     private static void MapContent(BottomSheetHandler handler, IBottomSheet bottomSheet)

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/Handlers/BottomSheetHandler.cs

@@ -18,7 +18,7 @@ internal sealed partial class BottomSheetHandler
         [nameof(IBottomSheet.Header)] = MapHeader,
         [nameof(IBottomSheet.States)] = MapStates,
         [nameof(IBottomSheet.CurrentState)] = MapCurrentState,
-        [nameof(IBottomSheet.Peek)] = MapPeek,
+        [nameof(IBottomSheet.PeekHeight)] = MapPeekHeight,
         [nameof(IBottomSheet.Content)] = MapContent,
         [nameof(IBottomSheet.Padding)] = MapPadding,
         [nameof(IBottomSheet.BackgroundColor)] = MapBackgroundColor,

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/Handlers/BottomSheetHandler.macios.cs

@@ -71,9 +71,9 @@ private static void MapCurrentState(BottomSheetHandler handler, IBottomSheet bot
         handler.PlatformView.SetCurrentState();
     }
 
-    private static void MapPeek(BottomSheetHandler handler, IBottomSheet bottomSheet)
+    private static void MapPeekHeight(BottomSheetHandler handler, IBottomSheet bottomSheet)
     {
-        handler.PlatformView.SetPeek();
+        handler.PlatformView.SetPeekHeight();
     }
 
     private static void MapContent(BottomSheetHandler handler, IBottomSheet bottomSheet)

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/Handlers/BottomSheetHandler.net.cs

@@ -53,7 +53,7 @@ private static void MapCurrentState(BottomSheetHandler handler, IBottomSheet bot
         throw new NotImplementedException();
     }
 
-    private static void MapPeek(BottomSheetHandler handler, IBottomSheet bottomSheet)
+    private static void MapPeekHeight(BottomSheetHandler handler, IBottomSheet bottomSheet)
     {
         throw new NotImplementedException();
     }

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/Handlers/CloseButtonHandler.macios.cs

@@ -6,6 +6,7 @@ namespace Plugin.Maui.BottomSheet.Handlers;
 /// <inheritdoc/>
 public class CloseButtonHandler : ButtonHandler
 {
+    /// <inheritdoc/>
     protected override UIButton CreatePlatformView()
     {
         return new UIButton(UIButtonType.Close);

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/IBottomSheet.cs

@@ -102,9 +102,9 @@ public interface IBottomSheet : IView, IPadding, ISafeAreaView
     Color WindowBackgroundColor { get; set; }
 
     /// <summary>
-    /// Gets or sets the <see cref="BottomSheetPeek"/>.
+    /// Gets or sets the PeekHeight.
     /// </summary>
-    BottomSheetPeek? Peek { get; set; }
+    double PeekHeight { get; set; }
 
     /// <summary>
     /// Gets or sets the executed command when the <see cref="IBottomSheet"/> is closing.

src/Plugin.Maui.BottomSheet/Plugin.Maui.BottomSheet/IBottomSheetExtensions.cs

@@ -0,0 +1,33 @@
+namespace Plugin.Maui.BottomSheet;
+
+// ReSharper disable once InconsistentNaming
+
+/// <summary>
+/// <see cref="IBottomSheet"/> extension methods.
+/// </summary>
+internal static class IBottomSheetExtensions
+{
+    /// <summary>
+    /// Get the <see cref="ContentPage"/> parent of <see cref="IBottomSheet"/>.
+    /// </summary>
+    /// <param name="bottomSheet"><see cref="IBottomSheet"/>.</param>
+    /// <returns><see cref="ContentPage"/> parent.</returns>
+    internal static ContentPage? GetPageParent(this IBottomSheet bottomSheet)
+    {
+        ContentPage? page = null;
+
+        var parent = bottomSheet.Parent;
+        while (parent is not null)
+        {
+            if (parent is ContentPage contentPage)
+            {
+                page = contentPage;
+                break;
+            }
+
+            parent = parent.Parent;
+        }
+
+        return page;
+    }
+}