From cc0984c378044fe0c2db33e5a3d030f342da2efa Mon Sep 17 00:00:00 2001
From: Oleksandr Liakhevych <liakh.oleksandr32@gmail.com>
Date: Mon, 28 Nov 2022 01:30:40 +0200
Subject: [PATCH] Add IndicatorView control (#89)

---
 .../Views/Collections/CarouselViewPage.razor  |  10 +-
 .../Elements/CarouselView.cs                  |  39 +++++
 .../Elements/IndicatorView.generated.cs       | 140 ++++++++++++++++++
 .../Properties/AttributeInfo.cs               |   3 +
 .../BlazorBindings.UnitTests.csproj           |   3 +-
 .../Elements/CarouselViewTests.razor          |  23 +++
 .../Elements/ElementTestBase.razor            |   9 --
 7 files changed, 215 insertions(+), 12 deletions(-)
 create mode 100644 src/BlazorBindings.Maui/Elements/CarouselView.cs
 create mode 100644 src/BlazorBindings.Maui/Elements/IndicatorView.generated.cs
 create mode 100644 src/BlazorBindings.UnitTests/Elements/CarouselViewTests.razor

diff --git a/samples/ControlGallery/Views/Collections/CarouselViewPage.razor b/samples/ControlGallery/Views/Collections/CarouselViewPage.razor
index a5c6c90a..98ada903 100644
--- a/samples/ControlGallery/Views/Collections/CarouselViewPage.razor
+++ b/samples/ControlGallery/Views/Collections/CarouselViewPage.razor
@@ -6,8 +6,9 @@
         <CarouselView Grid.Row="0"
                       ItemsSource="items"
                       Loop="false"
-                      @bind-CurrentItem="currentItem"
-                      @bind-Position="currentPosition">
+                      IndicatorView="() => indicatorView"
+        @bind-CurrentItem="currentItem"
+        @bind-Position="currentPosition">
 
             <ItemTemplate>
                 <Frame BackgroundColor="Colors.LightPink"
@@ -24,6 +25,10 @@
         </CarouselView>
 
         <VerticalStackLayout Grid.Row="1">
+            <IndicatorView @ref="indicatorView" HorizontalOptions="LayoutOptions.Center"
+                           IndicatorColor="Colors.DarkGray"
+                           SelectedIndicatorColor="Colors.LightGray" />
+
             <Label>Current item: @currentItem?.Name</Label>
             <Label>Current position: @currentPosition</Label>
             <Button Text="Set last position" OnClick="() => currentPosition = 3" />
@@ -40,6 +45,7 @@
         new("Gill", "https://static.wikia.nocookie.net/pixar/images/7/72/Gill.png/revision/latest/scale-to-width-down/350?cb=20210322233843")
     };
 
+    IndicatorView indicatorView;
     Item currentItem;
     int currentPosition;
 
diff --git a/src/BlazorBindings.Maui/Elements/CarouselView.cs b/src/BlazorBindings.Maui/Elements/CarouselView.cs
new file mode 100644
index 00000000..1ff43bb7
--- /dev/null
+++ b/src/BlazorBindings.Maui/Elements/CarouselView.cs
@@ -0,0 +1,39 @@
+using Microsoft.AspNetCore.Components;
+using System;
+using System.Threading.Tasks;
+using MC = Microsoft.Maui.Controls;
+
+namespace BlazorBindings.Maui.Elements
+{
+    public partial class CarouselView<T> : IHandleAfterRender
+    {
+        private MC.IndicatorView _indicatorView;
+
+        [Parameter] public Func<IndicatorView> IndicatorView { get; set; }
+
+        protected override bool HandleAdditionalParameter(string name, object value)
+        {
+            if (name == nameof(IndicatorView))
+            {
+                IndicatorView = (Func<IndicatorView>)value;
+                return true;
+            }
+
+            return base.HandleAdditionalParameter(name, value);
+        }
+
+        Task IHandleAfterRender.OnAfterRenderAsync()
+        {
+            if (IndicatorView != null)
+            {
+                var newIndicatorView = IndicatorView()?.NativeControl;
+                if (!Equals(newIndicatorView, _indicatorView))
+                {
+                    _indicatorView = newIndicatorView;
+                    NativeControl.IndicatorView = newIndicatorView;
+                }
+            }
+            return Task.CompletedTask;
+        }
+    }
+}
diff --git a/src/BlazorBindings.Maui/Elements/IndicatorView.generated.cs b/src/BlazorBindings.Maui/Elements/IndicatorView.generated.cs
new file mode 100644
index 00000000..0f22f0fa
--- /dev/null
+++ b/src/BlazorBindings.Maui/Elements/IndicatorView.generated.cs
@@ -0,0 +1,140 @@
+// <auto-generated>
+//     This code was generated by a BlazorBindings.Maui component generator.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+
+using BlazorBindings.Core;
+using BlazorBindings.Maui.Elements.Handlers;
+using MC = Microsoft.Maui.Controls;
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Rendering;
+using Microsoft.Maui.Graphics;
+using System.ComponentModel;
+using System.Threading.Tasks;
+
+namespace BlazorBindings.Maui.Elements
+{
+    public partial class IndicatorView : TemplatedView
+    {
+        static IndicatorView()
+        {
+            ElementHandlerRegistry.RegisterPropertyContentHandler<IndicatorView>(nameof(IndicatorTemplate),
+                (renderer, parent, component) => new DataTemplatePropertyHandler<MC.IndicatorView>(component,
+                    (x, dataTemplate) => x.IndicatorTemplate = dataTemplate));
+            RegisterAdditionalHandlers();
+        }
+
+        [Parameter] public int? Count { get; set; }
+        [Parameter] public bool? HideSingle { get; set; }
+        [Parameter] public Color IndicatorColor { get; set; }
+        [Parameter] public double? IndicatorSize { get; set; }
+        [Parameter] public MC.IndicatorShape? IndicatorsShape { get; set; }
+        [Parameter] public int? MaximumVisible { get; set; }
+        [Parameter] public int? Position { get; set; }
+        [Parameter] public Color SelectedIndicatorColor { get; set; }
+        [Parameter] public RenderFragment IndicatorTemplate { get; set; }
+        [Parameter] public EventCallback<int> PositionChanged { get; set; }
+
+        public new MC.IndicatorView NativeControl => (MC.IndicatorView)((BindableObject)this).NativeControl;
+
+        protected override MC.IndicatorView CreateNativeElement() => new();
+
+        protected override void HandleParameter(string name, object value)
+        {
+            switch (name)
+            {
+                case nameof(Count):
+                    if (!Equals(Count, value))
+                    {
+                        Count = (int?)value;
+                        NativeControl.Count = Count ?? (int)MC.IndicatorView.CountProperty.DefaultValue;
+                    }
+                    break;
+                case nameof(HideSingle):
+                    if (!Equals(HideSingle, value))
+                    {
+                        HideSingle = (bool?)value;
+                        NativeControl.HideSingle = HideSingle ?? (bool)MC.IndicatorView.HideSingleProperty.DefaultValue;
+                    }
+                    break;
+                case nameof(IndicatorColor):
+                    if (!Equals(IndicatorColor, value))
+                    {
+                        IndicatorColor = (Color)value;
+                        NativeControl.IndicatorColor = IndicatorColor;
+                    }
+                    break;
+                case nameof(IndicatorSize):
+                    if (!Equals(IndicatorSize, value))
+                    {
+                        IndicatorSize = (double?)value;
+                        NativeControl.IndicatorSize = IndicatorSize ?? (double)MC.IndicatorView.IndicatorSizeProperty.DefaultValue;
+                    }
+                    break;
+                case nameof(IndicatorsShape):
+                    if (!Equals(IndicatorsShape, value))
+                    {
+                        IndicatorsShape = (MC.IndicatorShape?)value;
+                        NativeControl.IndicatorsShape = IndicatorsShape ?? (MC.IndicatorShape)MC.IndicatorView.IndicatorsShapeProperty.DefaultValue;
+                    }
+                    break;
+                case nameof(MaximumVisible):
+                    if (!Equals(MaximumVisible, value))
+                    {
+                        MaximumVisible = (int?)value;
+                        NativeControl.MaximumVisible = MaximumVisible ?? (int)MC.IndicatorView.MaximumVisibleProperty.DefaultValue;
+                    }
+                    break;
+                case nameof(Position):
+                    if (!Equals(Position, value))
+                    {
+                        Position = (int?)value;
+                        NativeControl.Position = Position ?? (int)MC.IndicatorView.PositionProperty.DefaultValue;
+                    }
+                    break;
+                case nameof(SelectedIndicatorColor):
+                    if (!Equals(SelectedIndicatorColor, value))
+                    {
+                        SelectedIndicatorColor = (Color)value;
+                        NativeControl.SelectedIndicatorColor = SelectedIndicatorColor;
+                    }
+                    break;
+                case nameof(IndicatorTemplate):
+                    IndicatorTemplate = (RenderFragment)value;
+                    break;
+                case nameof(PositionChanged):
+                    if (!Equals(PositionChanged, value))
+                    {
+                        void NativeControlPropertyChanged(object sender, PropertyChangedEventArgs e)
+                        {
+                            if (e.PropertyName == nameof(NativeControl.Position))
+                            {
+                                var value = NativeControl.Position;
+                                Position = value;
+                                InvokeEventCallback(PositionChanged, value);
+                            }
+                        }
+
+                        PositionChanged = (EventCallback<int>)value;
+                        NativeControl.PropertyChanged -= NativeControlPropertyChanged;
+                        NativeControl.PropertyChanged += NativeControlPropertyChanged;
+                    }
+                    break;
+
+                default:
+                    base.HandleParameter(name, value);
+                    break;
+            }
+        }
+
+        protected override void RenderAdditionalElementContent(RenderTreeBuilder builder, ref int sequence)
+        {
+            base.RenderAdditionalElementContent(builder, ref sequence);
+            RenderTreeBuilderHelper.AddDataTemplateProperty(builder, sequence++, typeof(IndicatorView), IndicatorTemplate);
+        }
+
+        static partial void RegisterAdditionalHandlers();
+    }
+}
diff --git a/src/BlazorBindings.Maui/Properties/AttributeInfo.cs b/src/BlazorBindings.Maui/Properties/AttributeInfo.cs
index cb4d9dbe..4519165a 100644
--- a/src/BlazorBindings.Maui/Properties/AttributeInfo.cs
+++ b/src/BlazorBindings.Maui/Properties/AttributeInfo.cs
@@ -43,6 +43,9 @@
 [assembly: GenerateComponent(typeof(HorizontalStackLayout))]
 [assembly: GenerateComponent(typeof(Image))]
 [assembly: GenerateComponent(typeof(ImageButton))]
+[assembly: GenerateComponent(typeof(IndicatorView),
+    PropertyChangedEvents = new[] { nameof(IndicatorView.Position) },
+    Exclude = new[] { nameof(IndicatorView.ItemsSource), nameof(IndicatorView.IndicatorLayout) })]
 [assembly: GenerateComponent(typeof(InputView))]
 [assembly: GenerateComponent(typeof(ItemsView),
     GenericProperties = new[] { nameof(ItemsView.ItemsSource), nameof(ItemsView.ItemTemplate) },
diff --git a/src/BlazorBindings.UnitTests/BlazorBindings.UnitTests.csproj b/src/BlazorBindings.UnitTests/BlazorBindings.UnitTests.csproj
index b2e1880f..02c43c68 100644
--- a/src/BlazorBindings.UnitTests/BlazorBindings.UnitTests.csproj
+++ b/src/BlazorBindings.UnitTests/BlazorBindings.UnitTests.csproj
@@ -5,7 +5,7 @@
     <IsPackable>false</IsPackable>
 	<UseMaui>true</UseMaui>
   </PropertyGroup>
-
+	
   <ItemGroup>
     <PackageReference Include="nunit" Version="3.13.3" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.0" />
@@ -15,4 +15,5 @@
   <ItemGroup>
     <ProjectReference Include="..\BlazorBindings.Maui\BlazorBindings.Maui.csproj" />
   </ItemGroup>
+	
 </Project>
diff --git a/src/BlazorBindings.UnitTests/Elements/CarouselViewTests.razor b/src/BlazorBindings.UnitTests/Elements/CarouselViewTests.razor
new file mode 100644
index 00000000..776add41
--- /dev/null
+++ b/src/BlazorBindings.UnitTests/Elements/CarouselViewTests.razor
@@ -0,0 +1,23 @@
+@inherits ElementTestBase
+
+@code {
+    [Test]
+    public async Task SetIndicatorViewToCarouselView()
+    {
+        var items = new[] { 1, 2, 3, 4, 5 };
+
+        IndicatorView indicatorViewRef = null;
+        var parent = await Render<MC.Layout>(
+    @<VerticalStackLayout>
+        <CarouselView IndicatorView="() => indicatorViewRef" ItemsSource="items" />
+        <IndicatorView @ref="indicatorViewRef" />
+    </VerticalStackLayout>
+    );
+
+        var carouselView = (MC.CarouselView)parent.Children[0];
+        var indicatorView = (MC.IndicatorView)parent.Children[1];
+
+        Assert.That(indicatorView, Is.SameAs(indicatorViewRef.NativeControl));
+        Assert.That(indicatorView.ItemsSource, Is.EqualTo(items));
+    }
+}
diff --git a/src/BlazorBindings.UnitTests/Elements/ElementTestBase.razor b/src/BlazorBindings.UnitTests/Elements/ElementTestBase.razor
index e9921b7f..eb51f7d1 100644
--- a/src/BlazorBindings.UnitTests/Elements/ElementTestBase.razor
+++ b/src/BlazorBindings.UnitTests/Elements/ElementTestBase.razor
@@ -5,15 +5,6 @@
 @code {
     private MauiBlazorBindingsRenderer _renderer = TestBlazorBindingsRenderer.Create();
 
-    protected override bool ShouldRender() => false;
-
-    public ElementTestBase()
-    {
-        // We need to prevent this component from rendering.
-        var field = typeof(ComponentBase).GetField("_hasNeverRendered", BindingFlags.NonPublic | BindingFlags.Instance);
-        field.SetValue(this, false);
-    }
-
     protected async Task<T> Render<T>(RenderFragment renderFragment) where T : MC.BindableObject
     {
         var container = new RootContainerHandler();