|
public GetDeferral ( ) : |
||
| return | ||
private async void OnDeferredImageRequestedHandler(DataProviderRequest request)
{
// In this delegate we provide updated Bitmap data using delayed rendering.
if (_imageFile != null)
{
// If the delegate is calling any asynchronous operations it needs to acquire
// the deferral first. This lets the system know that you are performing some
// operations that might take a little longer and that the call to SetData
// could happen after the delegate returns. Once you acquired the deferral object
// you must call Complete on it after your final call to SetData.
DataProviderDeferral deferral = request.GetDeferral();
InMemoryRandomAccessStream inMemoryStream = new InMemoryRandomAccessStream();
// Make sure to always call Complete when finished with the deferral.
try
{
// Decode the image and re-encode it at 50% width and height.
IRandomAccessStream imageStream = await _imageFile.OpenAsync(FileAccessMode.Read);
BitmapDecoder imageDecoder = await BitmapDecoder.CreateAsync(imageStream);
BitmapEncoder imageEncoder = await BitmapEncoder.CreateForTranscodingAsync(inMemoryStream, imageDecoder);
imageEncoder.BitmapTransform.ScaledWidth = (uint)(imageDecoder.OrientedPixelWidth * 0.5);
imageEncoder.BitmapTransform.ScaledHeight = (uint)(imageDecoder.OrientedPixelHeight * 0.5);
await imageEncoder.FlushAsync();
request.SetData(RandomAccessStreamReference.CreateFromStream(inMemoryStream));
}
finally
{
deferral.Complete();
}
}
}
async void OnDeferredImageRequestedHandler(DataProviderRequest request)
{
// 非同期処理の開始
var deferral = request.GetDeferral();
try
{
// ファイルの非同期操作
#if WINDOWS_APP
// 適当なファイルを用意
var files = (await KnownFolders.PicturesLibrary.GetFilesAsync())
.Where(x => Path.GetExtension(x.Name) == ".jpg")
.Take(1);
#else
// 適当なファイルを用意
var files = (await KnownFolders.CameraRoll.GetFilesAsync())
.Where(x => Path.GetExtension(x.Name) == ".jpg")
.Take(1);
#endif
// 共有するファイル
request.SetData(files);
}
finally
{
// 非同期処理の終了
deferral.Complete();
}
}
private void DelayRenderer(DataProviderRequest request)
{
var deferral = request.GetDeferral();
var tn = RandomAccessStreamReference.CreateFromUri(new Uri("ms-appx:///assets/hololens.png"));
request.SetData(tn);
deferral.Complete();
}
private void OnDeferredImageRequestedHandler(DataProviderRequest request)
{
if (_url != null)
{
// If the delegate is calling any asynchronous operations it needs to acquire
// the deferral first. This lets the system know that you are performing some
// operations that might take a little longer and that the call to SetData
// could happen after the delegate returns. Once you acquired the deferral object
// you must call Complete on it after your final call to SetData.
DataProviderDeferral deferral = request.GetDeferral();
// Make sure to always call Complete when finished with the deferral.
try
{
request.SetData(_url);
}
finally
{
deferral.Complete();
}
}
}
private void OnShareBitmapData(DataProviderRequest request)
{
var deferral = request.GetDeferral();
Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
{
try
{
var file = await ApplicationData.Current.TemporaryFolder.
CreateFileAsync("TempImage.png",
CreationCollisionOption.ReplaceExisting);
// Render XAML control to PNG image
using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
var renderTargetBitmap = new RenderTargetBitmap();
await renderTargetBitmap.RenderAsync(SharedControl);
var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, stream);
encoder.SetPixelData(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Straight,
(uint)renderTargetBitmap.PixelWidth,
(uint)renderTargetBitmap.PixelHeight,
96, 96,
pixelBuffer.ToArray());
await encoder.FlushAsync();
}
// Share file
request.SetData(RandomAccessStreamReference.CreateFromFile(file));
}
finally
{
deferral.Complete();
}
});
}
async private void OnDeferredImageRequestedHandler(DataProviderRequest request, StorageFile imageFile)
{
if (imageFile != null)
{
// Since this method is using "await" prior to setting the data in DataPackage,
// deferral object must be used
var deferral = request.GetDeferral();
// Surround try catch to ensure that we always call Complete on defferal.
try
{
using (var imageStream = await imageFile.OpenAsync(FileAccessMode.Read))
{
// Decode the image
var imageDecoder = await BitmapDecoder.CreateAsync(imageStream);
// Re-encode the image at 50% width and height
var inMemoryStream = new InMemoryRandomAccessStream();
var imageEncoder = await BitmapEncoder.CreateForTranscodingAsync(inMemoryStream, imageDecoder);
imageEncoder.BitmapTransform.ScaledWidth = (uint)(imageDecoder.OrientedPixelWidth * 0.5);
imageEncoder.BitmapTransform.ScaledHeight = (uint)(imageDecoder.OrientedPixelHeight * 0.5);
await imageEncoder.FlushAsync();
request.SetData(RandomAccessStreamReference.CreateFromStream(inMemoryStream));
}
}
finally
{
deferral.Complete();
}
await log(OutputText, "Image has been set via deferral");
}
else
{
await log(OutputText, "Error: imageFile is null");
}
}
private static void onDeferredReqHdlr(DataProviderRequest request)
{
DataProviderDeferral deferral = request.GetDeferral();
// Make sure to always call Complete when done with the deferral.
try
{
}
finally
{
deferral.Complete();
}
}
private async void OnDeferredImageRequestedHandler(DataProviderRequest request)
{
// Request deferral to wait for async calls
DataProviderDeferral deferral = request.GetDeferral();
// XAML objects can only be accessed on the UI thread, and the call may come in on a background thread
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async () =>
{
try
{
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap();
InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream();
// Render to an image at the current system scale and retrieve pixel contents
await renderTargetBitmap.RenderAsync(collageCanvas);
var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();
// Encode image to an in-memory stream
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, stream);
encoder.SetPixelData(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Ignore,
(uint)renderTargetBitmap.PixelWidth,
(uint)renderTargetBitmap.PixelHeight,
DisplayInformation.GetForCurrentView().LogicalDpi,
DisplayInformation.GetForCurrentView().LogicalDpi,
pixelBuffer.ToArray());
await encoder.FlushAsync();
// Set content of the DataProviderRequest to the encoded image in memory
request.SetData(RandomAccessStreamReference.CreateFromStream(stream));
}
finally
{
deferral.Complete();
}
});
}