[Vm-dev] Extended Clipboard

[Eliot Miranda]

Hi All,

    xclip can be used to inspect the clipboard:

$ xclip -verbose -o -t TARGETS
Connected to X server.
Using TARGETS.
Type is ATOM.
TARGETS
image/png
image/jpeg

and the source code is available.  Using it the code in sqUnixX11.c should
be fixable.  Good luck!


On Tue, Mar 28, 2023 at 1:47 PM Eliot Miranda <eliot.miranda at gmail.com>
wrote:

> 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
>


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