This is a good scenario, but I'm not sure if this can be solved using the
current design. You probably want a promise to the ClipboardItem? Also, I
think the MIME type in the Clipboarditem is only useful when we are
specifying DOMString instead of Blobs, which is currently not supported in
Chromium. If we create a Blob after the data has been populated, then we
can probably just use the MIME type from the Blob during the clipboard
write operation. This feature can be implemented just like the promises to
blobs without breaking the sites that use ClipboardItem instead of promises
to ClipboardItem, so we should definitely consider adding this to the async
clipboard API in the future.
The promises to Blobs feature unblocks some of the key scenarios in Excel
online as well as scenarios where a promise to the Blob helps in creating
the Blob asynchronously without losing the transient user activation delay,
so I think this feature will still be useful even if we implement promise
to ClipboardItem.
-Anupam
On Tue, Nov 2, 2021 at 1:23 AM 'Thomas Steiner' via blink-dev <
blink-dev@chromium.org> wrote:
> One problem with async blob creation I ran into is dynamically created
> blobs of unknown type:
>
> navigator.clipboard.write([
> new ClipboardItem({
> 'foo/bar': new Promise(async (resolve) => {
> // Obtain blob data somehow, the type `foo/bar` will be dynamic.
> resolve(new Blob([data], { type: 'foo/bar' }));
> }),
> }),
> ]);
>
> You need to know `foo/bar` for passing it to `ClipboardItem`, but it may
> only be available after the data has been created. Since Safari and Chrome
> expire user gestures differently (see
> https://bugs.webkit.org/show_bug.cgi?id=222262#c5), this renders some
> copy use cases currently impossible.
>
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