Re: [PATCH] ui/cocoa: Add clipboard support

[Peter Maydell <peter.maydell@linaro.org>]

On Wed, 16 Jun 2021 at 15:20, Akihiko Odaki <akihiko.odaki@gmail.com> wrote:
>
> Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>

Hi Akihiko -- I have a similar question here to the other
patch about doing things not on the Cocoa UI thread...

> +static void cocoa_clipboard_notify(Notifier *notifier, void *data)
> +{
> +    QemuClipboardInfo *info = data;
> +
> +    if (info->owner == &cbpeer || info->selection != QEMU_CLIPBOARD_SELECTION_CLIPBOARD) {
> +        return;
> +    }
> +
> +    if (info != cbinfo) {
> +        NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
> +        qemu_clipboard_info_unref(cbinfo);
> +        cbinfo = qemu_clipboard_info_ref(info);
> +        cbchangecount = [[NSPasteboard generalPasteboard] declareTypes:@[NSPasteboardTypeString] owner:cbowner];
> +        [pool release];

Is this OK to do on a non-Cocoa thread with an autorelease pool,
or should it be done via dispatch_async ?

> +    }
> +
> +    qemu_event_set(&cbevent);
> +}

>  /*
>   * The startup process for the OSX/Cocoa UI is complicated, because
>   * OSX insists that the UI runs on the initial main thread, and so we
> @@ -1845,6 +1937,7 @@ static void addRemovableDevicesMenuItems(void)
>      COCOA_DEBUG("Second thread: calling qemu_main()\n");
>      status = qemu_main(gArgc, gArgv, *_NSGetEnviron());
>      COCOA_DEBUG("Second thread: qemu_main() returned, exiting\n");
> +    [cbowner release];
>      exit(status);
>  }
>
> @@ -1965,6 +2058,18 @@ static void cocoa_refresh(DisplayChangeListener *dcl)
>              [cocoaView setAbsoluteEnabled:YES];
>          });
>      }
> +
> +    if (cbchangecount != [[NSPasteboard generalPasteboard] changeCount]) {
> +        qemu_clipboard_info_unref(cbinfo);
> +        cbinfo = qemu_clipboard_info_new(&cbpeer, QEMU_CLIPBOARD_SELECTION_CLIPBOARD);
> +        if ([[NSPasteboard generalPasteboard] availableTypeFromArray:@[NSPasteboardTypeString]]) {
> +            cbinfo->types[QEMU_CLIPBOARD_TYPE_TEXT].available = true;
> +        }
> +        qemu_clipboard_update(cbinfo);
> +        cbchangecount = [[NSPasteboard generalPasteboard] changeCount];
> +        qemu_event_set(&cbevent);
> +    }
> +

This work in the cocoa_refresh() function is done not on the Cocoa
UI thread. Is it OK for it to do that, or should we put it into a
dispatch_async block ?

>      [pool release];
>  }

thanks
-- PMM