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CaptureImageAsync method implemented
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35 changes: 19 additions & 16 deletions
35
...wToImage/Xamarin.Forms.ViewToImage.csproj → ImageFromXamarinUI/ImageFromXamarinUI.csproj
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| using System; | ||
| using System.IO; | ||
| using System.Threading.Tasks; | ||
| using Android.Graphics; | ||
| using Xamarin.Forms; | ||
| using Xamarin.Forms.Platform.Android; | ||
|
|
||
| namespace ImageFromXamarinUI | ||
| { | ||
| public static partial class VisualElementExtension | ||
| { | ||
| static async Task<Stream> PlatformCaptureImageAsync(VisualElement view) | ||
| { | ||
| using var bitmap = ViewToBitMap(GetNativeView(view)); | ||
| var stream = await BitMapToStream(bitmap); | ||
| bitmap.Recycle(); | ||
| return stream; | ||
| } | ||
|
|
||
| static Android.Views.View GetNativeView(VisualElement view) | ||
| { | ||
| var render = Platform.GetRenderer(view); | ||
|
|
||
| if (render == null) | ||
| throw new ArgumentException($"The {view} parameter does not have a render", nameof(view)); | ||
|
|
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| return render.View; | ||
| } | ||
|
|
||
| static Bitmap ViewToBitMap(Android.Views.View view) | ||
| { | ||
| var bitmap = Bitmap.CreateBitmap(view.Width, view.Height, Bitmap.Config.Argb8888); | ||
| using var canvas = new Canvas(bitmap); | ||
| canvas.DrawColor(Android.Graphics.Color.Transparent); | ||
| view.Draw(canvas); | ||
|
|
||
| return bitmap; | ||
| } | ||
|
|
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| static async Task<Stream> BitMapToStream(Bitmap bitmap) | ||
| { | ||
| var ms = new MemoryStream(); | ||
| await bitmap.CompressAsync(Bitmap.CompressFormat.Png, 100, ms).ConfigureAwait(false); | ||
| ms.Position = 0; | ||
| return ms; | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| using System; | ||
| using System.IO; | ||
| using System.Threading.Tasks; | ||
| using UIKit; | ||
| using Xamarin.Forms; | ||
| using Xamarin.Forms.Platform.iOS; | ||
|
|
||
| namespace ImageFromXamarinUI | ||
| { | ||
| public static partial class VisualElementExtension | ||
| { | ||
| static Task<Stream> PlatformCaptureImageAsync(VisualElement view) | ||
| { | ||
| Stream stream = null; | ||
| using (var image = ViewToUIImage(GetNativeView(view))) | ||
| stream = ImageToStream(image); | ||
| return Task.FromResult(stream); | ||
| } | ||
|
|
||
| static UIView GetNativeView(VisualElement view) | ||
| { | ||
| var render = Platform.GetRenderer(view); | ||
|
|
||
| if (render == null) | ||
| throw new ArgumentException($"The {view} parameter does not have a render", nameof(view)); | ||
|
|
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| return render.NativeView; | ||
| } | ||
|
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| static UIImage ViewToUIImage(UIView view) | ||
| { | ||
| UIGraphics.BeginImageContextWithOptions(view.Frame.Size, false, UIScreen.MainScreen.Scale); | ||
| view.Layer.RenderInContext(UIGraphics.GetCurrentContext()); | ||
| var image = UIGraphics.GetImageFromCurrentImageContext(); | ||
| UIGraphics.EndImageContext(); | ||
|
|
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| return image; | ||
| } | ||
|
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| static Stream ImageToStream(UIImage image) | ||
| { | ||
| var imageData = image.AsPNG(); | ||
| return imageData.AsStream(); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| using System; | ||
| using System.IO; | ||
| using System.Threading.Tasks; | ||
| using Xamarin.Forms; | ||
|
|
||
| namespace ImageFromXamarinUI | ||
| { | ||
| public static partial class VisualElementExtension | ||
| { | ||
| static Task<Stream> PlatformCaptureImageAsync(VisualElement view) | ||
| => throw new NotImplementedException($"{nameof(CaptureImageAsync)} not supported on netstandart project"); | ||
|
|
||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| using System.IO; | ||
| using System.Threading.Tasks; | ||
| using Xamarin.Forms; | ||
|
|
||
| namespace ImageFromXamarinUI | ||
| { | ||
| public static partial class VisualElementExtension | ||
| { | ||
| /// <summary>Captures an image from the current state of <paramref name="element"/></summary> | ||
| /// <param name="element">element to which the render was assigned</param> | ||
| /// <returns>Stream an image as png with transparency</returns> | ||
| public static async Task<Stream> CaptureImageAsync(this VisualElement element) | ||
| => await PlatformCaptureImageAsync(element); | ||
| } | ||
| } |
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12 changes: 0 additions & 12 deletions
12
Sample.Xamarin.Forms.ViewToImage/ViewExtension.netstandard.cs
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