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Inport initial implementation from PR unoplatform#1796
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| using System; | ||
| using System.IO; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using Android.Graphics.Pdf; | ||
| using Android.OS; | ||
| using Windows.Foundation; | ||
|
|
||
| namespace Windows.Data.Pdf; | ||
|
|
||
| public partial class PdfDocument : IDisposable | ||
| { | ||
| private readonly PdfRenderer _pdfRenderer; | ||
|
|
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| private PdfDocument(PdfRenderer pdfRenderer) | ||
| { | ||
| this._pdfRenderer = pdfRenderer ?? throw new ArgumentNullException(nameof(pdfRenderer)); | ||
| } | ||
|
|
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| public bool IsPasswordProtected => false; | ||
|
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| public uint PageCount => (uint)_pdfRenderer.PageCount; | ||
|
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| public PdfPage GetPage(uint pageIndex) | ||
| { | ||
| if (pageIndex >= _pdfRenderer.PageCount) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(pageIndex), $"In this document the page index cannot be {pageIndex}. Page count is {_pdfRenderer.PageCount}"); | ||
| } | ||
|
|
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| var pdfPage = _pdfRenderer.OpenPage((int)pageIndex); | ||
| return new PdfPage(pdfPage); | ||
| } | ||
|
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| public static IAsyncOperation<PdfDocument> LoadFromFileAsync(Storage.IStorageFile file) | ||
| { | ||
| return LoadFromFileAsync(file, null); | ||
| } | ||
|
|
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| public static IAsyncOperation<PdfDocument> LoadFromFileAsync(Storage.IStorageFile file, string password) | ||
| { | ||
| if (!string.IsNullOrEmpty(password)) | ||
| { | ||
| // password protected PDF files are not supported by PdfRenderer in Android | ||
| throw new NotImplementedException("The member IAsyncOperation<PdfDocument> PdfDocument.LoadFromFileAsync(IStorageFile file, string password) is not implemented in Uno."); | ||
| } | ||
|
|
||
| if (file is null) | ||
| { | ||
| throw new ArgumentNullException(nameof(file)); | ||
| } | ||
|
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| var localpath = file.Path; | ||
| var fileDescriptor = localpath.StartsWith('/') | ||
| ? ParcelFileDescriptor.Open(new Java.IO.File(localpath), ParcelFileMode.ReadOnly) | ||
| : Android.App.Application.Context.ContentResolver.OpenFileDescriptor(Android.Net.Uri.Parse(localpath), "r"); | ||
| var pdfRenderer = new PdfRenderer(fileDescriptor); | ||
| var pdfDocument = new PdfDocument(pdfRenderer); | ||
|
|
||
| return Task.FromResult(pdfDocument).AsAsyncOperation(); | ||
| } | ||
|
|
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| public static IAsyncOperation<PdfDocument> LoadFromStreamAsync(Storage.Streams.IRandomAccessStream inputStream) | ||
| { | ||
| return LoadFromStreamAsync(inputStream, default); | ||
| } | ||
|
|
||
| public static IAsyncOperation<PdfDocument> LoadFromStreamAsync(Storage.Streams.IRandomAccessStream inputStream, string password) | ||
| { | ||
| if (!string.IsNullOrEmpty(password)) | ||
| { | ||
| // password protected PDF files are not supported by PdfRenderer in Android | ||
| throw new NotImplementedException("The member IAsyncOperation<PdfDocument> PdfDocument.LoadFromStreamAsync(IRandomAccessStream inputStream, string password) is not implemented in Uno."); | ||
| } | ||
| return AsyncOperation.FromTask(async ct => | ||
| { | ||
| var parcel = await GetParcelFileDescriptorFromStreamAsync(inputStream.AsStream(), ct); | ||
| var pdfRenderer = new PdfRenderer(parcel); | ||
| var pdfDocument = new PdfDocument(pdfRenderer); | ||
| return pdfDocument; | ||
| }); | ||
| } | ||
|
|
||
| public void Dispose() | ||
| { | ||
| _pdfRenderer.Dispose(); | ||
| } | ||
|
|
||
| private static Task<ParcelFileDescriptor> GetParcelFileDescriptorFromStreamAsync(Stream input, CancellationToken token) => | ||
| Task.Run(() => | ||
| { | ||
| /* PdfRenderer https://developer.android.com/reference/android/graphics/pdf/PdfRenderer#PdfRenderer(android.os.ParcelFileDescriptor) | ||
| * PdfRenderer needs a seek-able ParcelFileDescriptor, | ||
| * to get it from a stream (without using hacks), | ||
| * you need to copy the stream to a temporary file. | ||
| */ | ||
| var fileName = Path.GetTempFileName(); | ||
| var file = new Java.IO.File(fileName); | ||
| file.DeleteOnExit(); | ||
| var outputStream = new Java.IO.FileOutputStream(file); | ||
| byte[] buf = new byte[4096]; | ||
| var len = 0; | ||
| while (!token.IsCancellationRequested && (len = input.Read(buf, 0, buf.Length)) > 0) | ||
| { | ||
| outputStream.Write(buf, 0, len); | ||
| } | ||
| outputStream.Flush(); | ||
| outputStream.Close(); | ||
| return ParcelFileDescriptor.Open(file, ParcelFileMode.ReadOnly); | ||
| }, token); | ||
| } |
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