private static DataPackageView GetFromNative(NSPasteboard pasteboard)
{
if (pasteboard is null)
{
throw new ArgumentException(nameof(pasteboard));
}
var dataPackage = new DataPackage();
// Extract all the standard data format information from the pasteboard items.
// Each format can only be used once; therefore, generally the last occurrence of the format will be the one used.
foreach (NSPasteboardItem item in pasteboard.PasteboardItems)
{
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeTIFF) ||
item.Types.Contains(NSPasteboard.NSPasteboardTypePNG))
{
// Images may be very large, we never want to load them until they are needed.
// Therefore, create a data provider used to asynchronously fetch the image.
dataPackage.SetDataProvider(
StandardDataFormats.Bitmap,
async cancellationToken =>
{
NSImage?image = null;
/* Some apps, including Photos, don't appear to put image data in the pasteboard.
* Instead, the image URL is provided although the type indicates it is an image.
*
* To get around this an image is read as follows:
* (1) If the pasteboard contains an image type then:
* (2) Attempt to read the image as an object (NSImage).
* This may fail as some tested apps provide a URL although declare an image (Photos).
* With other apps (such as web browsers) an image will be read correctly here.
* (3) If reading as an NSImage object fails, attempt to read the image from a file URL (local images)
* (4) If reading from a file URL fails, attempt to read the image from a URL (remote images)
*
* Reading as an NSImage object follows the docs here:
* https://docs.microsoft.com/en-us/xamarin/mac/app-fundamentals/copy-paste#add-an-nsdocument
*/
var classArray = new Class[] { new Class("NSImage") };
if (pasteboard.CanReadObjectForClasses(classArray, null))
{
NSObject[] objects = pasteboard.ReadObjectsForClasses(classArray, null);
if (objects.Length > 0)
{
// Only use the first image found
image = objects[0] as NSImage;
}
}
// In order to get here the pasteboard must have declared it had image types.
// However, if image is null, no objects were found and the image is likely a URL instead.
if (image == null &&
item.Types.Contains(NSPasteboard.NSPasteboardTypeFileUrl))
{
var url = item.GetStringForType(NSPasteboard.NSPasteboardTypeFileUrl);
image = new NSImage(new NSUrl(url));
}
if (image == null &&
item.Types.Contains(NSPasteboard.NSPasteboardTypeUrl))
{
var url = item.GetStringForType(NSPasteboard.NSPasteboardTypeUrl);
image = new NSImage(new NSUrl(url));
}
if (image != null)
{
// Thanks to: https://stackoverflow.com/questions/13305028/monomac-best-way-to-convert-bitmap-to-nsimage/13355747
using (var imageData = image.AsTiff())
{
var imgRep = NSBitmapImageRep.ImageRepFromData(imageData !) as NSBitmapImageRep;
var data = imgRep !.RepresentationUsingTypeProperties(NSBitmapImageFileType.Png, null);
return(new RandomAccessStreamReference(async ct =>
{
return data.AsStream().AsRandomAccessStream().TrySetContentType("image/png");
}));
}
}
else
{
// Return an empty image
return(new RandomAccessStreamReference(async ct =>
{
var stream = new MemoryStream();
stream.Position = 0;
return stream.AsRandomAccessStream().TrySetContentType("image/png");
}));
}
});
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeHTML))
{
var html = item.GetStringForType(NSPasteboard.NSPasteboardTypeHTML);
if (html != null)
{
dataPackage.SetHtmlFormat(html);
}
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeRTF))
{
var rtf = item.GetStringForType(NSPasteboard.NSPasteboardTypeRTF);
if (rtf != null)
{
dataPackage.SetRtf(rtf);
}
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeFileUrl))
{
// Drag and drop will use temporary URLs similar to: file:///.file/id=1234567.1234567
var tempFileUrl = item.GetStringForType(NSPasteboard.NSPasteboardTypeFileUrl);
// Files may be very large, we never want to load them until they are needed.
// Therefore, create a data provider used to asynchronously fetch the file.
dataPackage.SetDataProvider(
StandardDataFormats.StorageItems,
async cancellationToken =>
{
// Convert from a temp Url (see above example) into an absolute file path
var fileUrl = new NSUrl(tempFileUrl);
var file = await StorageFile.GetFileFromPathAsync(fileUrl.FilePathUrl.AbsoluteString);
var storageItems = new List <IStorageItem>();
storageItems.Add(file);
return(storageItems.AsReadOnly());
});
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeString))
{
var text = item.GetStringForType(NSPasteboard.NSPasteboardTypeString);
if (text != null)
{
dataPackage.SetText(text);
}
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeUrl))
{
var url = item.GetStringForType(NSPasteboard.NSPasteboardTypeUrl);
if (url != null)
{
DataPackage.SeparateUri(
url,
out string?webLink,
out string?applicationLink);
if (webLink != null)
{
dataPackage.SetWebLink(new Uri(webLink));
}
if (applicationLink != null)
{
dataPackage.SetApplicationLink(new Uri(applicationLink));
}
// Deprecated but still added for compatibility
dataPackage.SetUri(new Uri(url));
}
}
}
return(dataPackage.GetView());
}
public static DataPackageView GetContent()
{
var dataPackage = new DataPackage();
var manager = ContextHelper.Current.GetSystemService(Context.ClipboardService) as ClipboardManager;
if (manager is null)
{
return(dataPackage.GetView());
}
var clipData = manager.PrimaryClip;
Uri /* ? */ clipApplicationLink = null;
string /* ? */ clipHtml = null;
string /* ? */ clipText = null;
Uri /* ? */ clipUri = null;
Uri /* ? */ clipWebLink = null;
// Extract all the standard data format information from the clipboard.
// Each format can only be used once; therefore, the last occurrence of the format will be the one used.
if (clipData != null)
{
for (int itemIndex = 0; itemIndex < clipData.ItemCount; itemIndex++)
{
var item = clipData.GetItemAt(itemIndex);
if (item != null)
{
var itemText = item.Text;
if (itemText != null)
{
clipText = itemText;
}
var itemUriStr = item.Uri?.ToString();
if (itemUriStr != null)
{
DataPackage.SeparateUri(
itemUriStr,
out string webLink,
out string applicationLink);
clipWebLink = webLink != null ? new Uri(webLink) : null;
clipApplicationLink = applicationLink != null ? new Uri(applicationLink) : null;
clipUri = new Uri(itemUriStr); // Deprecated but still added for compatibility
}
var itemHtml = item.HtmlText;
if (itemHtml != null)
{
clipHtml = itemHtml;
}
}
}
}
// Add standard data formats to the data package.
// This can be done synchronously on Android since the data is already available from above.
if (clipApplicationLink != null)
{
dataPackage.SetApplicationLink(clipApplicationLink);
}
if (clipHtml != null)
{
dataPackage.SetHtmlFormat(clipHtml);
}
if (clipText != null)
{
dataPackage.SetText(clipText);
}
if (clipUri != null)
{
dataPackage.SetUri(clipUri);
}
if (clipWebLink != null)
{
dataPackage.SetWebLink(clipWebLink);
}
return(dataPackage.GetView());
}