1.2.9.6

README.md

@@ -88,24 +88,12 @@ ___Please star ⭐ if you like it, helps very much!___
 	* Perspective2
 
 
-## Demo Apps
-
-* This repo includes a Sandbox project for some custom controls, with playground examples, custom controls, maps etc
-* More creating custom controls examples inside the [Engine Demo](https://github.com/taublast/AppoMobi.Maui.DrawnUi.Demo) 🤩 __Updated with latest nuget!__
-* A [dynamic arcade game](https://github.com/taublast/AppoMobi.Maui.DrawnUi.SpaceShooter) drawn with this engine, uses preview nuget with SkiaSharp v3.
-* A [drawn CollectionView demo](https://github.com/taublast/SurfAppCompareDrawn) where you could see how simple and profitable it is to convert an existing recycled cells list into a drawn one
-* [Shaders Carousel Demo](https://github.com/taublast/ShadersCarousel/) featuring SkiaSharp v3 capabilities
-* For production published apps list - scroll to bottom!
-
- [ShaderEffect.webm](https://github.com/taublast/DrawnUi.Maui/assets/25801194/47c97290-e16b-4928-bfa4-8b29fb0ff8e1)
-
-V3 preview: subclassed `SkiaShaderEffect`, implementing `ISkiaGestureProcessor`, `IStateEffect` and `IPostRendererEffect` when compiled for SkiaSharp v3 preview.
-
 ## What's New
 
-### Nuget 1.2.9.5
+### Nuget 1.2.9.6
 for SkiaSharp 2.88.9-preview.2.2 
-
+* HotFix for SkiaCarousel always setting index at 0 upon initialization.
+* HotFix for random crash accessing disposed LoadedImageSource.
 * [HotFix](https://github.com/taublast/DrawnUi.Maui/issues/136) for loading images from StreamImageSource
 * SkiaShape new Types: Polygon and Line. New property for their Points: Smooth (0-1) to smooth angles.
 * Shapes demo page inside SandBox project.
@@ -116,6 +104,23 @@ for SkiaSharp 2.88.9-preview.2.2
 * Fixed controls sometimes not invalidated when canvas suface size changes
 * Other fixes.
 
+## About
+
+[A small article](https://taublast.github.io/posts/MauiJuly/) about the library and why it was created
+
+## Demo Apps
+
+* This repo includes a Sandbox project for some custom controls, with playground examples, custom controls, maps etc
+* More creating custom controls examples inside the [Engine Demo](https://github.com/taublast/AppoMobi.Maui.DrawnUi.Demo) 🤩 __Updated with latest nuget!__
+* A [dynamic arcade game](https://github.com/taublast/AppoMobi.Maui.DrawnUi.SpaceShooter) drawn with this engine, uses preview nuget with SkiaSharp v3.
+* A [drawn CollectionView demo](https://github.com/taublast/SurfAppCompareDrawn) where you could see how simple and profitable it is to convert an existing recycled cells list into a drawn one
+* [Shaders Carousel Demo](https://github.com/taublast/ShadersCarousel/) featuring SkiaSharp v3 capabilities
+* For production published apps list - scroll to bottom!
+
+ [ShaderEffect.webm](https://github.com/taublast/DrawnUi.Maui/assets/25801194/47c97290-e16b-4928-bfa4-8b29fb0ff8e1)
+
+V3 preview: subclassed `SkiaShaderEffect`, implementing `ISkiaGestureProcessor`, `IStateEffect` and `IPostRendererEffect` when compiled for SkiaSharp v3 preview.
+
  ## Development Notes
 
 * All files to be consumed (images etc) must be placed inside the MAUI app Resources/Raw folder, subfolders allowed. If you need to load from the native app folder use prefix "file://".
@@ -162,10 +167,42 @@ As you can see in this example the Maui view `Canvas` will adapt its size to dra
 #### Code behind
 
 ```csharp
-	_todo_
+            Canvas = new Canvas()
+            {
+                Gestures = GesturesMode.Enabled,
+                HardwareAcceleration = HardwareAccelerationMode.Enabled,
+                HorizontalOptions = LayoutOptions.Fill,
+                VerticalOptions = LayoutOptions.Fill,
+                BackgroundColor = Colors.Black,
+                Content = new SkiaLayout()
+                {
+                    HorizontalOptions = LayoutOptions.Fill,
+                    VerticalOptions = LayoutOptions.Fill,
+                    Children = new List<SkiaControl>()
+                    {
+
+                        new SkiaShape()
+                            {
+                                BackgroundColor = Colors.DodgerBlue,
+                                CornerRadius = 16,
+                                WidthRequest = 150,
+                                HeightRequest = 150,
+                                HorizontalOptions = LayoutOptions.Center,
+                                VerticalOptions = LayoutOptions.Center,
+                                Content = new SkiaLabel()
+                                {
+                                    TextColor = Colors.White,
+                                    HorizontalOptions = LayoutOptions.Center,
+                                    VerticalOptions = LayoutOptions.Center,
+                                    Text="Oyee"
+                                }
+                            }
+                    }
+                }
+            };
 ```
 
-Please check the demo app, it contains many examples of usage.
+Please check the Sandbox and Demo apps, they contain many examples of usage.
 
 #### Important differences between DrawnUI and Xamarin.Forms/Maui layouts:
 
@@ -373,7 +410,7 @@ if set they will override the specific value from `Margin`, and the result would
 Even more, sometimes you might want to bind your code to `AddMarginTop`, `AddMarginLeft`, `AddMarginRight`, `AddMarginBottom`..  
 When designing custom controls please use `Margins` property to read the final margin value.
 
-##### BindingCotext propagation in layout
+##### BindingContext propagation in layout
 
 When a parent has children attached it sets their binding content to its own by calling `SetInheritedBindingContext` of the child ONLY if child's BindingContext is actually null. So when the Parent property of the child gets set to null this child BindingContext is set to null too.   
 

dev/github_uploadnugets.bat

@@ -13,8 +13,8 @@ REM Define the source directory for the packages
 set "source_dir=E:\Nugets"
 
 REM Define the list of file masks for the packages
-set "mask[1]=DrawnUi.Maui*.1.2.9.5*.nupkg"
-set "mask[2]=AppoMobi.Maui.DrawnUi.1.2.9.5*.*nupkg"
+set "mask[1]=DrawnUi.Maui*.1.2.9.6*.nupkg"
+set "mask[2]=AppoMobi.Maui.DrawnUi.1.2.9.6*.*nupkg"
 set "mask_count=2"
 
 REM Loop through each file mask

dev/nuget_uploadnugets.bat

@@ -13,8 +13,8 @@ REM Define the source directory for the packages
 set "source_dir=E:\Nugets"
 
 REM Define the list of file masks for the packages
-set "mask[1]=DrawnUi.Maui*.1.2.9.5*.nupkg"
-set "mask[2]=AppoMobi.Maui.DrawnUi.1.2.9.5*.*nupkg"
+set "mask[1]=DrawnUi.Maui*.1.2.9.6*.nupkg"
+set "mask[2]=AppoMobi.Maui.DrawnUi.1.2.9.6*.*nupkg"
 set "mask_count=2"
 
 REM Loop through each file mask

src/Addons/DrawnUi.Maui.Camera/DrawnUi.Maui.Camera.csproj

@@ -44,7 +44,7 @@
 
     <!--production-->
   <ItemGroup Condition="'$(UseNuget)' == 'true'">
-    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.5" />
+    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.6" />
   </ItemGroup>
 
 </Project>

src/Addons/DrawnUi.Maui.Game/DrawnUi.Maui.Game.csproj

@@ -42,7 +42,7 @@
 
   <!--production-->
   <ItemGroup Condition="'$(UseNuget)' == 'true'">
-    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.5" />
+    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.6" />
   </ItemGroup>
 
 

src/Addons/DrawnUi.Maui.MapsUi/src/DrawnUi.Maui.MapsUi.csproj

@@ -54,7 +54,7 @@
 
   <!--production-->
   <ItemGroup Condition="'$(UseNuget)' == 'true'">
-    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.5" />
+    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.6" />
   </ItemGroup>
 
 </Project>

src/Addons/DrawnUi.Maui.Rive/DrawnUi.Maui.Rive.csproj

@@ -47,7 +47,7 @@
 
   <!--production-->
   <ItemGroup Condition="'$(UseNuget)' == 'true'">
-    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.5" />
+    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.6" />
   </ItemGroup>
 
 

src/Addons/DrawnUi.MauiGraphics/DrawnUi.MauiGraphics.csproj

@@ -41,7 +41,7 @@
 
   <!--production-->
   <ItemGroup Condition="'$(UseNuget)' == 'true'">
-    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.5" />
+    <PackageReference Include="AppoMobi.Maui.DrawnUi" Version="1.2.9.6" />
   </ItemGroup>
 
   <ItemGroup>

src/Directory.Build.props

@@ -5,13 +5,13 @@
 
   <PropertyGroup Condition="'$(UseSkiaSharp3)' != 'true'">
     <PackageReleaseNotes>Using SkiaSharp 2.xx. Checkout the DrawnUi Sandbox project for usage example.</PackageReleaseNotes>
-    <Version>1.2.9.5</Version>
+    <Version>1.2.9.6</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(UseSkiaSharp3)' == 'true'">
     <DefineConstants>$(DefineConstants);SKIA3</DefineConstants>
     <PackageReleaseNotes>Using SkiaSharp 3-preview. New handlers, SKSL, WinUI hardware acceleration etc..</PackageReleaseNotes>
-    <Version>1.3.54.5-pre</Version>
+    <Version>1.3.55.1-pre</Version>
   </PropertyGroup>
 
 </Project>

src/Engine/Controls/Carousel/SkiaCarousel.cs

@@ -447,8 +447,16 @@ public override object CreateContentFromTemplate()
 
     //}
 
+    private bool _itemsSourceChangedNeedResetIndex;
+    private bool _loaded;
+
+
     public override void OnItemSourceChanged()
     {
+        _itemsSourceChangedNeedResetIndex = _loaded;
+
+        _loaded = true;
+
         base.OnItemSourceChanged();
 
         AdaptChildren();
@@ -877,7 +885,7 @@ public virtual void InitializeChildren()
 
         CurrentSnap = new(-1, -1);
 
-        if (SnapPoints.Any())// && (SelectedIndex < 0 || SelectedIndex > snapPoints.Count - 1))
+        if (SnapPoints.Any() && (_itemsSourceChangedNeedResetIndex || SelectedIndex < 0 || SelectedIndex > snapPoints.Count - 1))
         {
             SelectedIndex = 0;
         }
@@ -886,6 +894,7 @@ public virtual void InitializeChildren()
             ApplyIndex(true);
         }
 
+        _itemsSourceChangedNeedResetIndex = false;
         OnChildrenInitialized();
     }
 
@@ -1149,6 +1158,8 @@ public virtual bool IsAtEnd
 
     protected virtual void OnSelectedIndexChanged(int index)
     {
+        _itemsSourceChangedNeedResetIndex = false;
+
         SelectedIndexChanged?.Invoke(this, index);
 
         //forced to use ui-tread for maui not to randomly crash 

src/Engine/Draw/Images/LoadedImageSource.cs

@@ -115,25 +115,28 @@ public SKBitmap Bitmap
         get => _bitmap;
         set
         {
-            _bitmap = value;
-            if (_bitmap == null)
+            if (!IsDisposed)
             {
-                if (_image == null)
+                _bitmap = value;
+                if (_bitmap == null)
                 {
-                    _height = 0;
-                    _width = 0;
+                    if (_image == null)
+                    {
+                        _height = 0;
+                        _width = 0;
+                    }
+                    else
+                    {
+                        _height = _image.Height;
+                        _width = _image.Width;
+                    }
                 }
                 else
                 {
-                    _height = _image.Height;
-                    _width = _image.Width;
+                    _height = _bitmap.Height;
+                    _width = _bitmap.Width;
                 }
             }
-            else
-            {
-                _height = _bitmap.Height;
-                _width = _bitmap.Width;
-            }
         }
     }
 
@@ -142,21 +145,24 @@ public SKImage Image
         get => _image;
         set
         {
-            _image = value;
-            if (_image == null)
+            if (!IsDisposed)
             {
-                if (_bitmap == null)
+                _image = value;
+                if (_image == null)
                 {
-                    _height = 0;
-                    _width = 0;
+                    if (_bitmap == null)
+                    {
+                        _height = 0;
+                        _width = 0;
+                    }
                 }
-            }
-            else
-            {
-                if (_bitmap == null)
+                else
                 {
-                    _height = _image.Height;
-                    _width = _image.Width;
+                    if (_bitmap == null)
+                    {
+                        _height = _image.Height;
+                        _width = _image.Width;
+                    }
                 }
             }
         }

src/Engine/Draw/Layout/SkiaLayout.ViewsAdapter.cs

@@ -357,7 +357,7 @@ async Task InitializeFull(bool measure)
             {
                 lock (_lockTemplates)
                 {
-                    lock (_parent.LockMeasure)
+                    //lock (_parent.LockMeasure) was needed testing two-threaded rendering
                     {
                         TemplesInvalidating = false;
 

src/Engine/Draw/Layout/SkiaLayout.cs

@@ -216,7 +216,7 @@ public SkiaLayout()
         {
             ChildrenFactory = new(this);
 
-            PostponeInvalidation(nameof(OnItemSourceChanged), OnItemSourceChanged);
+            PostponeInvalidation(nameof(ResetItemsSource), ResetItemsSource);
             //OnItemSourceChanged();
         }
 
@@ -1116,7 +1116,7 @@ public LayoutType Type
             nameof(InitializeTemplatesInBackgroundDelay),
             typeof(int),
             typeof(SkiaLayout),
-            0, propertyChanged: ItemsSourcePropertyChanged);
+            0, propertyChanged: NeedUpdateItemsSource);
 
         /// <summary>
         /// Whether should initialize templates in background instead of blocking UI thread, default is 0.
@@ -1136,7 +1136,7 @@ public int InitializeTemplatesInBackgroundDelay
             typeof(ItemSizingStrategy),
             typeof(SkiaLayout),
             ItemSizingStrategy.MeasureFirstItem,
-            propertyChanged: ItemsSourcePropertyChanged);
+            propertyChanged: NeedUpdateItemsSource);
 
         public ItemSizingStrategy ItemSizingStrategy
         {
@@ -1147,7 +1147,7 @@ public ItemSizingStrategy ItemSizingStrategy
         public static readonly BindableProperty ItemTemplatePoolSizeProperty = BindableProperty.Create(nameof(ItemTemplatePoolSize),
         typeof(int),
         typeof(SkiaLayout),
-        -1, propertyChanged: ItemsSourcePropertyChanged);
+        -1, propertyChanged: NeedUpdateItemsSource);
         /// <summary>
         /// Default is -1, the number od template instances will not be less than data collection count. You can manually set to to a specific number to fill your viewport etc. Beware that if you set this to a number that will not be enough to fill the viewport binding contexts will contasntly be changing triggering screen update.
         /// </summary>
@@ -1227,29 +1227,26 @@ private static void NeedUpdateItemsSource(BindableObject bindable, object oldval
             //skiaControl.PostponeInvalidation(nameof(UpdateItemsSource), skiaControl.UpdateItemsSource);
             //skiaControl.Update();
 
-            skiaControl.OnItemSourceChanged();
-        }
-
-        void UpdateItemsSource()
-        {
-            OnItemSourceChanged();
-
-            Invalidate();
+            skiaControl.ResetItemsSource();
         }
 
         public override void OnItemTemplateChanged()
         {
             //PostponeInvalidation(nameof(OnItemSourceChanged), OnItemSourceChanged);
-            OnItemSourceChanged();
+            ResetItemsSource();
         }
 
         public bool ApplyNewItemsSource { get; set; }
 
         public virtual void OnItemSourceChanged()
+        {
+            ResetItemsSource();
+        }
+
+        public virtual void ResetItemsSource()
         {
             //if (!string.IsNullOrEmpty(Tag))
             //    Debug.WriteLine($"OnItemSourceChanged {Tag} {IsTemplated} {IsMeasuring}");
-
             if (!IsTemplated || !BindingContextWasSet && ItemsSource == null) //do not create items from templates until the context was changed properly to avoid bugs
             {
                 return;