private async Task SetUserImageAsync(string imageUri, CancellationToken cancellationToken)
{
var oldImage = this.UserPicture.Image;
this.UserPicture.Image = null;
oldImage?.Dispose();
// ProfileImageUrlHttps が null になる場合があるらしい
// 参照: https://sourceforge.jp/ticket/browse.php?group_id=6526&tid=33871
if (imageUri == null)
{
return;
}
await this.UserPicture.SetImageFromTask(async() =>
{
var uri = imageUri.Replace("_normal", "_bigger");
using (var imageStream = await Networking.Http.GetStreamAsync(uri).ConfigureAwait(false))
{
var image = await MemoryImage.CopyFromStreamAsync(imageStream)
.ConfigureAwait(false);
if (cancellationToken.IsCancellationRequested)
{
image.Dispose();
throw new OperationCanceledException(cancellationToken);
}
return(image);
}
});
}
private async Task LoadUserIconAsync(Uri imageUri, long userId)
{
var oldImage = this.UserIcon.Image;
this.UserIcon.Image = null;
oldImage?.Dispose();
await this.UserIcon.SetImageFromTask(async() =>
{
var uri = imageUri.AbsoluteUri.Replace("_normal", "_bigger");
using (var imageStream = await Networking.Http.GetStreamAsync(uri))
{
var image = await MemoryImage.CopyFromStreamAsync(imageStream);
// 画像の読み込み中に選択中のユーザーが変化していたらキャンセルとして扱う
var selectedUser = (UserInfo)this.UserList.SelectedItem;
if (selectedUser.Id != userId)
{
image.Dispose();
throw new OperationCanceledException();
}
return(image);
}
});
}
public async Task ImageFormat_GifTest()
{
using (var imgStream = File.OpenRead("Resources/re.gif"))
using (var image = await MemoryImage.CopyFromStreamAsync(imgStream).ConfigureAwait(false))
{
Assert.Equal(ImageFormat.Gif, image.ImageFormat);
Assert.Equal(".gif", image.ImageFormatExt);
}
}
private async Task <MemoryImage> FetchImageAsync(string uri, CancellationToken cancelToken)
{
using (var response = await Networking.Http.GetAsync(uri, cancelToken).ConfigureAwait(false))
{
response.EnsureSuccessStatusCode();
using (var imageStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
return(await MemoryImage.CopyFromStreamAsync(imageStream)
.ConfigureAwait(false));
}
}
}
public async Task Equals_Test()
{
using (var imgStream1 = File.OpenRead("Resources/re.gif"))
using (var image1 = await MemoryImage.CopyFromStreamAsync(imgStream1).ConfigureAwait(false))
{
using (var imgStream2 = File.OpenRead("Resources/re.gif"))
using (var image2 = await MemoryImage.CopyFromStreamAsync(imgStream2).ConfigureAwait(false))
{
Assert.True(image1.Equals(image2));
Assert.True(image2.Equals(image1));
}
using (var image3 = TestUtils.CreateDummyImage())
{
Assert.False(image1.Equals(image3));
Assert.False(image3.Equals(image1));
}
}
}
/// <summary>
/// MemoryImage インスタンスを非同期に複製します
/// </summary>
/// <remarks>
/// メソッド実行中にストリームのシークが行われないよう注意して下さい。
/// 特に PictureBox で Gif アニメーションを表示している場合は Enabled に false をセットするなどして更新を止めて下さい。
/// </remarks>
/// <returns>複製された MemoryImage を返すタスク</returns>
public Task <MemoryImage> CloneAsync()
{
this.Stream.Seek(0, SeekOrigin.Begin);
return(MemoryImage.CopyFromStreamAsync(this.Stream));
}