[Vm-dev] Extended Clipboard

[Eliot Miranda]

Hi Hilaire, Hi unix/linux bods,

    I've got the ClipboardExtendedPlugin to compile and run on linux, but
the results are disappointing.  The guts of the implementation is in this
interfacer in platforms/unix/vm-display/x11/sqUnixX11.c:

char **clipboardGetTypeNames();
sqInt clipboardSizeWithType(char *typeName, int ntypeName);
sqInt clipboardReadIntoAt(sqInt count, sqInt byteArrayIndex, sqInt
startIndex);
void *firstIndexableField(sqInt oop);
void clipboardWriteWithType(char *data, size_t ndata, char *typeName,
size_t ntypeName, int isDnd, int isClaiming);

At a trivial level the code
in platforms/unix/plugins/ClipboardExtendedPlugin/sqUnixExtendedClipboard.c
ncould be improved if

// TODO: clipboardGetTypeNames() should be cached. And the simplest way to
do
// this is to have display_clipboardGetTypeNames do the cacheing and
freeing,
// it freeing the previous invocation's data if the clipboard has changed,
// then all the multiple frees below can disappear. Further, the signature
can
// be changed to include a pointer to the item count and then the indexing
// can safely be done directly. eem. '23/3/25

But more fundamentally the API implementation in sqUnixX11.c needs
extending.  I recommend playing with e.g. firefox and the file finder,
copying various items, and observing the state of the clipboard, through a
suitable viewer. I prematurely deleted some dubious code from
sqUnixExtendedClipboard.c that one might be able to construct a simple
viewer/lister from.  In any case, the relevant information does not
percolate up from the sqUnixX11.c API to allow the
sqUnixExtendedClipboard.c API to pass the desired information up to
Squeak.  An X11 maven should be able to get this going quickly.  Any HPI
linux users feel like having a go?

If so, viel Glück!

On Thu, Mar 23, 2023 at 5:58 PM Eliot Miranda <eliot.miranda at gmail.com>
wrote:

> Hi Hilaire,
>
> On Mar 23, 2023, at 2:38 PM, Hilaire Fernandes <hfern at free.fr> wrote:
>
> 
>
> Hi Eliot,
>
> I will try to take a deep look as I have also interest for tablet support
> on Linux. This is a completely new domain (VM) for me.
>
>
> I hope you find it fun!
>
> Your job is to implement this interface:
>
> void sqPasteboardClear(void *inPasteboard); sqInt sqPasteboardGetItemCount
> (void *inPasteboard); sqInt sqPasteboardCopyItemFlavorsitemNumber(void
> *inPasteboard, sqInt formatNumber); void *sqCreateClipboard(void); void
> sqPasteboardPutItemFlavordatalengthformatTypeformatLength(void
> *inPasteboard, char *inData, sqInt dataLength, char *format, sqInt
> formatLength); void sqPasteboardPutItemFlavordatalengthformatType(void
> *inPasteboard, char *inData, sqInt dataLength, sqInt format); sqInt
> sqPasteboardCopyItemFlavorDataformatformatLength(void *inPasteboard, char
> *format, sqInt formatLength); sqInt sqPasteboardCopyItemFlavorDataformat(
> void *inPasteboard, sqInt format); sqInt
> sqPasteboardhasDataInFormatformatLength(void *inPasteboard, char *format,
> sqInt formatLength); sqInt sqPasteboardhasDataInFormat(void
> *inPasteboard, sqInt format); which is present only in
> src/plugins/ClipboardExtendedPlugin/ClipboardExtendedPlugin.c, a
> departure from the house style which would have put it in platforms/Cross/
> plugins/ClipboardExtendedPlugin/ClipboardExtendedPlugin.h; no doubt John
> had his reasons.
>
> Use platforms/iOS/plugins/ClipboardExtendedPlugin/sqMacExtendedClipboard.m
> & platforms/win32/plugins/ClipboardExtendedPlugin/sqWin32ExtendedClipboard.c
> as guides. The Mac uses strings to identify clipboard types (the char
> *format, sqInt formatLength) variant, as opposed to win32, which uses
> integers (the sqInt format variant). Whichever works.
>
> You’ll implement it in platforms/unix/plugins/ClipboardExtendedPlugin/
> sqUnixExtendedClipboard.c
>
> Thanks
>
> Hilaire
> Le 23/03/2023 à 21:05, Eliot Miranda a écrit :
>
> As John said it doesn't appear to exist for Linux.  But X11 has a
> clipboard and implementing the innards for X11 shouldn't be that
> difficult.  The only complication is that if one wants to do the job
> "properly" one has to extend the indirection scheme Ian Piumarta came up
> with so that it can work on the other graphical back-ends such as the raw
> frame buffer.  Hillaire, if you're interested in implementing the X11
> ExtendedClipboard internals I'm happy to answer any questions you have.
>
> --
> GNU Dr. Geohttp://drgeo.euhttp://blog.drgeo.eu
>
>

-- 
_,,,^..^,,,_
best, Eliot
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