Re: Clipboard improvements, II
- From: Hans Breuer <Hans Breuer org>
- To: James Henstridge <james daa com au>
- Cc: gtk-devel-list gnome org, Matthias Clasen <mclasen redhat com>
- Subject: Re: Clipboard improvements, II
- Date: Tue, 25 May 2004 14:33:49 +0200
At 04:40 25.05.04, James Henstridge wrote:
On 25/05/2004 6:38 AM, Hans Breuer wrote:
But it still does not support copying image via Clipboard, or di I miss
this? I should have been more clear with what I would like to be able to do :
- copy images to clipboard via cross-platform gtk/gdk code (could replace
my winclipboard plug-in delivered with Gimp)
- copy vector data to Clipboard (one of the major drawbacks of Dia - at
least on windoze - is it's diability to just copy some stuff and paste it
into say word)
Under X, the contents of a selection is represented as an array of 8-bit,
16-bit or 32-bit quantities (the last two are provided to allow transfer
of 16-bit and 32-bit quantities between clients with different endians).
An image or vector diagram can be represented as binary data, so
transferring it as a selection is no more difficult than transferring
text. It is just necessary for the two end points to agree on a target name.
To get interoperability with existing apps under Windows, you would need
to know the target names that native apps use, and the format they
transfer data in. If there was a GtkClipboard API for "copy this pixbuf",
then the Windows version would probably want to advertise the data in the
appropriate well known forms.
The problem is not to "advertise the data in the appropriate well known
forms" (It is already solved by the winclipboard plug-in". Problem is that
this kind of stuff is completely missing in the GtkClipboard API.
From a brief look at the OLE clipboard docs on MSDN, it doesn't look
like there is that big a difference in how the two act. Mozilla has a
cross platform API with implementations for win32 and X clipboard, so
it must be possible ...
Yeah, obviously it is possible on win32 - even without OLE. The
Clipboard API works with shared memory (i.e. GlobalAlloc see
gimp/plug-ins/common/winclipboard.c). But on X it appears to be either so
complicated or so unusual to do/want this, that nobody bothers to
implement it ...
My point is that Mozilla uses the OLE clipboard, which is quite similar to
the X clipboard (advertise supported flavours/targets on copy, delay the
rendering of data and transfer until paste). The relevant files
implementing Mozilla's Windows clipboard support are here:
Thanks for the pointers - but I still don't get why you insist on showing
me how it is done on windoze. My point is that there apparently is no
working standard on the X clipboard side.
BTW: I've tried to copy an image from Mozilla (Phoenix 0.5) to the windoze
clipboard. The only thing I ve got in the Clipboard was the alternate text ...
Doing the same from "the browser which should not be named" and pasting
into The Gimp via File/Acquire/From Clipboard (my clipboard plug-in;)
-------- Hans "at" Breuer "dot" Org -----------
Tell me what you need, and I'll tell you how to
get along without it. -- Dilbert
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