public async Task UpdateImageSourceAsync()
{
if (PlatformView != null)
{
var token = this.SourceManager.BeginLoad();
var imageSource = _imageSourcePart();
if (imageSource != null)
{
#if IOS || ANDROID || WINDOWS
var result = await imageSource.UpdateSourceAsync(PlatformView, ImageSourceServiceProvider, SetImage !, token)
.ConfigureAwait(false);
SourceManager.CompleteLoad(result);
#elif TIZEN
PlatformImage image = (PlatformView as PlatformImage) ?? new PlatformImage(PlatformView);
var result = await imageSource.UpdateSourceAsync(image, ImageSourceServiceProvider, SetImage !, token)
.ConfigureAwait(false);
SourceManager.CompleteLoad(result);
#else
await Task.CompletedTask;
#endif
}
else
{
SetImage?.Invoke(null);
SourceManager.CompleteLoad(null);
}
}
}
public async Task <ImageDataResult> GetImageDetails(byte[] image)
{
UIKit.UIImage uiImage = await image.ToImageAsync();
ImageDataResult data = new ImageDataResult
{
Width = (int)uiImage.Size.Width,
Heigth = (int)uiImage.Size.Height
};
return(data);
}
public string getResult()
{
string path = NSBundle.MainBundle.PathForResource("qr", "PNG");
UIKit.UIImage image = new UIKit.UIImage(path);
results = reader.DecodeImage(image, "", out error);
if (results != null && results.Length > 0)
{
return(results[0].BarcodeText);
}
return("Barcode not found.");
}
public async Task <string[]> GetImageDetails(byte[] image)
{
UIKit.UIImage uiImage = await image.ToImageAsync();
string[] data = new string[3]
{
uiImage.Size.Width.ToString(),
uiImage.Size.Height.ToString(),
image.Length.ToString()
};
return(data);
}
public static UIKit.UIImage ToImage(this byte[] data)
{
UIKit.UIImage image;
try
{
image = new UIKit.UIImage(Foundation.NSData.FromArray(data));
}
catch
{
return(null);
}
return(image);
}
public static UIKit.UIImage ImageFromByteArray(byte[] data)
{
if (data == null) {
return null;
}
UIKit.UIImage image;
try {
image = new UIKit.UIImage(Foundation.NSData.FromArray(data));
} catch (Exception e) {
Console.WriteLine ("Image load failed: " + e.Message);
return null;
}
return image;
}
public IosImageSourceImpl(string name, Func <Stream> streamSource, int quality)
{
Name = name;
_streamSource = streamSource;
_quality = quality;
using (var stream = streamSource.Invoke())
{
image = UIKit.UIImage.LoadFromData(NSData.FromStream(stream));
var size = image?.Size ?? new CoreGraphics.CGSize(0, 0);
Width = (int)size.Width;
Height = (int)size.Height;
Orientation = Orientation.Normal;
}
}
public static UIKit.UIImage ImageFromByteArray(byte[] data)
{
if (data == null)
{
return(null);
}
UIKit.UIImage image;
try {
image = new UIKit.UIImage(Foundation.NSData.FromArray(data));
} catch (Exception e) {
Console.WriteLine("Image load failed: " + e.Message);
return(null);
}
return(image);
}
protected async override System.Threading.Tasks.Task <Tuple <UIKit.UIImage, UIKit.UIImage> > GetIcon(Page page)
{
string resourcePath = string.Empty;
// Load the icon as a SVG vector
if (TabbedPageIcons.TabbedPageIconsDictionary.TryGetValue(page.AutomationId, out resourcePath))
{
UIKit.UIImage img = await ImageService.Instance
.LoadEmbeddedResource(resourcePath)
.WithCustomDataResolver(new SvgDataResolver(26, 0, true))
.AsUIImageAsync();
return(new Tuple <UIKit.UIImage, UIKit.UIImage>(img, img));
}
return(await base.GetIcon(page));
}
public static Task <IImageSourceServiceResult <PlatformImage>?> GetPlatformImageAsync(this IImageSourceService imageSourceService, IImageSource?imageSource, IMauiContext mauiContext)
{
if (imageSource == null)
{
return(Task.FromResult <IImageSourceServiceResult <PlatformImage>?>(null));
}
#if IOS || MACCATALYST
return(imageSourceService.GetImageAsync(imageSource));
#elif ANDROID
return(imageSourceService.GetDrawableAsync(imageSource, mauiContext.Context !));
#elif WINDOWS
return(imageSourceService.GetImageSourceAsync(imageSource));
#elif TIZEN
var platformImage = new PlatformImage(mauiContext.GetNativeParent());
return(imageSourceService.GetImageAsync(imageSource, platformImage));
#else
throw new NotImplementedException();
#endif
}
public static byte[] ResizeImageIOS(byte[] imageData, float width, float height, int quality)
{
UIImage originalImage = ImageFromByteArray(imageData);
float oldWidth = (float)originalImage.Size.Width;
float oldHeight = (float)originalImage.Size.Height;
float scaleFactor = 0f;
if (oldWidth > oldHeight)
{
scaleFactor = width / oldWidth;
}
else
{
scaleFactor = height / oldHeight;
}
float newHeight = oldHeight * scaleFactor;
float newWidth = oldWidth * scaleFactor;
//create a 24bit RGB image
using (CGBitmapContext context = new CGBitmapContext(IntPtr.Zero,
(int)newWidth, (int)newHeight, 8,
(int)(4 * newWidth), CGColorSpace.CreateDeviceRGB(),
CGImageAlphaInfo.PremultipliedFirst)) {
RectangleF imageRect = new RectangleF(0, 0, newWidth, newHeight);
// draw the image
context.DrawImage(imageRect, originalImage.CGImage);
UIKit.UIImage resizedImage = UIKit.UIImage.FromImage(context.ToImage());
// save the image as a jpeg
return(resizedImage.AsJPEG((float)quality).ToArray());
}
}
//https://forums.xamarin.com/discussion/67531/how-to-resize-image-file-on-xamarin-forms-writeablebitmap-package-cant-be-added
public byte[] GetThumbnailBytes(byte[] imageData, float width, float height)
{
UIKit.UIImage originalImage = ImageFromByteArray(imageData);
var originalHeight = originalImage.Size.Height;
var originalWidth = originalImage.Size.Width;
nfloat newHeight = 0;
nfloat newWidth = 0;
if (originalHeight > originalWidth)
{
newHeight = height;
nfloat ratio = originalHeight / height;
newWidth = originalWidth / ratio;
}
else
{
newWidth = width;
nfloat ratio = originalWidth / width;
newHeight = originalHeight / ratio;
}
width = (float)newWidth;
height = (float)newHeight;
UIKit.UIGraphics.BeginImageContext(new System.Drawing.SizeF(width, height));
originalImage.Draw(new System.Drawing.RectangleF(0, 0, width, height));
var resizedImage = UIKit.UIGraphics.GetImageFromCurrentImageContext();
UIKit.UIGraphics.EndImageContext();
var bytesImagen = resizedImage.AsJPEG().ToArray();
resizedImage.Dispose();
return(bytesImagen);
}
internal static _UIImage AsMonochrome(this _UIImage image, Color foreground)
{
var width = (int)image.Size.Width;
var height = (int)image.Size.Height;
var imageRect = new CGRect(0, 0, image.Size.Width, image.Size.Height);
var rawData = new byte[width * height * 4];
var outputData = new byte[width * height * 4];
var handle = GCHandle.Alloc(rawData);
try
{
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
{
using (var context = new CGBitmapContext(
data: rawData,
width: (nint)imageRect.Width,
height: (nint)imageRect.Height,
bitsPerComponent: 8,
bytesPerRow: (nint)imageRect.Width * 4,
colorSpace: colorSpace,
bitmapInfo: CGImageAlphaInfo.PremultipliedLast
)
)
{
context.DrawImage(imageRect, image.CGImage);
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
var index = x * 4 + y * height * 4;
var sourceAlpha = rawData[index + 3];
outputData[index + 0] = foreground.R;
outputData[index + 1] = foreground.G;
outputData[index + 2] = foreground.B;
outputData[index + 3] = sourceAlpha;
}
}
}
}
}
finally
{
handle.Free();
}
using (var dataProvider = new CGDataProvider(outputData, 0, outputData.Length))
{
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
{
var bitsPerComponent = 8;
var bytesPerPixel = 4;
using (var cgImage = new CGImage(
width,
height,
bitsPerComponent,
bitsPerComponent * bytesPerPixel,
bytesPerPixel * width,
colorSpace,
CGImageAlphaInfo.Last,
dataProvider,
null,
false,
CGColorRenderingIntent.Default
))
{
return(FromCGImage(cgImage));
}
}
}
}
public void SetImage(_UIImage image) => Image = image;
// on select of Gallery
private async Task galleryFunc()
{
#if __IOS__
var picker = new MediaPicker();
try
{
if (!picker.PhotosSupported)
{
UserDialogs.Instance.HideLoading();
UserDialogs.Instance.Alert("Photo Gallery is unavailable");
}
else
{
var result = await picker.PickPhotoAsync();
if (result == null)
{
return;
}
else
{
var memoryStream = new MemoryStream();
UserDialogs.Instance.ShowLoading("Uploading Image...", MaskType.Black);
result.GetStream().CopyTo(memoryStream);
imageByteArray_BlaffrViewModel = memoryStream.ToArray();
}
Device.BeginInvokeOnMainThread(() =>
{
ProfilePic = ImageSource.FromStream(() => result.GetStream());
});
UIKit.UIImage image = new UIKit.UIImage(result.Path);
UIKit.UIImage highres = image;
Foundation.NSData d = highres.AsJPEG(0.7f);
Byte[] myByteArray = new Byte[d.Length];
System.Runtime.InteropServices.Marshal.Copy(d.Bytes, myByteArray, 0, Convert.ToInt32(d.Length));
imageByteArray_BlaffrViewModel = myByteArray;
var p = ImageSource.FromStream(() => result.GetStream());
await this.OnPhotoReceived(result.Path, "");
}
}
catch (Exception ex)
{
string x = ex.Message;
}
#endif
#if __ANDROID__
var picker = new CrossMedia();
try
{
//if (!picker.IsLocalVoiceInteractionSupported)
//{
// UserDialogs.Instance.HideLoading();
// UserDialogs.Instance.Alert("Photo Gallery is unavailable");
//}
//else
//{
// var result = await picker();
// if (result == null)
// return;
// else
// {
// var memoryStream = new MemoryStream();
// UserDialogs.Instance.ShowLoading("Uploading Image...", MaskType.Black);
// result.GetStream().CopyTo(memoryStream);
// imageByteArray_ViewModel = memoryStream.ToArray();
// }
// Device.BeginInvokeOnMainThread(() =>
// {
// imageSource = ImageSource.FromStream(() => result.GetStream());
// });
// //UIKit.UIImage image = new UIKit.UIImage(result.Path);
// //var highres = image;
// //var d = highres.AsJPEG(0.7f);
// //Byte[] myByteArray = new Byte[d.Length];
// //System.Runtime.InteropServices.Marshal.Copy(d.Bytes, myByteArray, 0, Convert.ToInt32(d.Length));
// //imageByteArray_ViewModel = myByteArray;
// //var p = ImageSource.FromStream(() => result.GetStream());
// await this.OnPhotoReceived(result.Path, "");
//}
}
catch (Exception ex)
{
string x = ex.Message;
}
#endif
}
public async Task <byte[]> GetImage()
{
UIKit.UIImage image = UIKit.UIImage.FromBundle("ImageJPG.jpg");
return(image.AsJPEG().ToArray());
}
protected virtual PImage Transform(PImage sourceBitmap, string path, ImageSource source, bool isPlaceholder, string key)
{
return(sourceBitmap);
}
private Image(UIKit.UIImage image)
{
NativeImage = image;
Width = (int)image.Size.Width;
Height = (int)image.Size.Height;
}
public RemoteImage(Uri uri, PlatformImage img) : this(uri)
{
IsLoaded = true;
Bitmap = img;
}
public EntryBase(float y, NSUIImage icon, object data) : this(y)
{
Icon = icon;
Data = data;
}
public virtual void Dispose(bool disposing)
{
NativeImage = null;
}
/// <summary>
/// 文件另存为
/// 过程和打开文件相同，先检查本地
/// </summary>
public async void SaveAs()
{
if (State != FileItemState.None || string.IsNullOrEmpty(ID))
{
return;
}
string fileName = Path.Combine(Kit.CachePath, GetFileName());
if (!File.Exists(fileName))
{
// 先下载
bool suc = await Download();
if (!suc)
{
return;
}
}
#if UWP
FileSavePicker picker = new FileSavePicker();
picker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
picker.FileTypeChoices.Add(GetSaveDesc(), new List <string>()
{
GetExtName()
});
picker.SuggestedFileName = _itemInfo.FileName;
StorageFile file = await picker.PickSaveFileAsync();
if (file != null)
{
var folder = await StorageFolder.GetFolderFromPathAsync(Kit.CachePath);
var temp = await folder.TryGetItemAsync(GetFileName()) as StorageFile;
if (temp != null)
{
await temp.CopyAndReplaceAsync(file);
Kit.Msg("文件另存成功！");
return;
}
}
#elif ANDROID
//string savePath;
//string msg;
//if (FileType == FileItemType.Image)
//{
// savePath = IOUtil.GetPicturesPath();
// msg = "照片";
//}
//else if (FileType == FileItemType.Video)
//{
// savePath = IOUtil.GetMoviesPath();
// msg = "电影";
//}
//else if (FileType == FileItemType.Sound)
//{
// savePath = IOUtil.GetMusicPath();
// msg = "音乐";
//}
//else
//{
// savePath = IOUtil.GetDownloadsPath();
// msg = "下载";
//}
try
{
// 复制本地文件
// android 11.0 因放在其他公共目录时被过滤显示，统一放在下载
File.Copy(fileName, Path.Combine(IOUtil.GetDownloadsPath(), GetFileName()), true);
Kit.Msg("已保存到下载目录！");
}
catch
{
Kit.Warn("文件保存失败！");
}
#elif IOS
if (FileType == FileItemType.Image || FileType == FileItemType.Video)
{
var status = await Permissions.CheckStatusAsync <Permissions.Photos>();
if (status != PermissionStatus.Granted)
{
status = await Permissions.RequestAsync <Permissions.Photos>();
}
if (status == PermissionStatus.Granted)
{
if (FileType == FileItemType.Image)
{
var imageData = System.IO.File.ReadAllBytes(fileName);
var myImage = new UIKit.UIImage(Foundation.NSData.FromArray(imageData));
myImage.SaveToPhotosAlbum((image, error) =>
{
if (error == null)
{
Kit.Msg("已保存到照片！");
}
});
}
else
{
UIKit.UIVideo.SaveToPhotosAlbum(fileName, (image, error) =>
{
if (error == null)
{
Kit.Msg("已保存到照片！");
}
});
}
}
}
else
{
// 普通文件以共享方式保存
await ShareFile();
}
#endif
}
protected override UIKit.UIImage Transform(UIKit.UIImage source)
{
RGBAWMatrix = FFColorMatrix.ColorToTintMatrix(R, G, B, A);
return(base.Transform(source));
}
public EntryBase(float y, NSUIImage icon) : this(y)
{
Icon = icon;
}