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Re: New clipboard handling notes (XFree86-xserv-4.3.0-31)
- From: Alexander Gottwald <alexander dot gottwald at s1999 dot tu-chemnitz dot de>
- To: cygx <cygwin-xfree at cygwin dot com>
- Date: Mon, 5 Jan 2004 13:19:06 +0100 (MET)
- Subject: Re: New clipboard handling notes (XFree86-xserv-4.3.0-31)
- References: <3FF914DD.7070100@msu.edu>
- Reply-to: cygwin-xfree at cygwin dot com
On Mon, 5 Jan 2004, Harold L Hunt II wrote:
> Here are my notes that I put together to convince myself that the new
> clipboard handling was complete and would not cause infinite loops.
> Please examine the notes if you are interested in the new code or if you
> would like to double-check my logic for errors.
>
> Please review the steps and post to the list if you think you have found
> an error. Also, if you find a bug or a crash, look at these steps and
> try to identify the approximate location of your problem so that we can
> do a better job of debugging.
>
> Harold
>
>
> Copy in X11
> ===========
> 1) winProcSetSelectionOwner gets called and takes ownership of the Win32
> clipboard (OpenClipboard, EmptyClipboard, SetClipboardData (foo, NULL)).
>
> 2) Selection is owned by another X11 client (the one that called
> XSetSelectionOwner).
>
> 3) EmptyClipboard() in step #1 files WM_DRAWCLIPBOARD message, which is
> ignored since hwnd == GetClipboardOwner ().
>
> 4) Paste in X11
> a) Owning X11 client handles SelectionRequest events.
>
> b) Item is pasted within X11 without round-trip to Win32.
>
> 5) Paste in Win32
> a) WM_RENDERFORMAT fires.
>
> b) SelectionRequest is sent, conversion from X11 to Win32 is done.
>
> c) SetClipboardData is called, passing converted text.
>
> 6) Copy in X11 (different app)
> a) Goto Step #1.
>
> 7) Copy in Win32
> a) Clipboard is emptied and owned by the other application.
>
> b) WM_DRAWCLIPBOARD fires, XSetSelectionOwner is called, owning the
> selection for the clipboard integration manager.
>
>
> Copy in Win32
> =============
> 1) WM_DRAWCLIPBOARD fires, calls XSetSelectionOwner for itself.
>
> 2) winProcSetSelectionOwner gets called, does nothing since clipboard
> X11 window is the window that is taking ownership.
>
> 3) Paste in Win32
> a) Clipboard owning Win32 app handles GetClipboardData call.
>
> b) Item is pasted without round-trip to X11.
>
> 4) Paste in X11
> a) Clipboard integration manager receives SelectionRequest.
>
> b) GetClipboardData is called, returning Win32 clipboard contents.
>
> c) Conversion from Win32 to X11 is done and text is pasted.
>
> 5) Copy in X11
> a) winProcSetSelectionOwner is called.
>
> b) Clipboard integration manager takes ownership of Win32 clipboard.
>
> c) WM_DRAWCLIPBOARD fires and is ignored since hwnd ==
> GetClipboardOwner ().
>
> 6) Copy in Win32 (different app)
> a) Goto Step #1.
>
Looks good to me.
bye
ago
--
Alexander.Gottwald@s1999.tu-chemnitz.de
http://www.gotti.org ICQ: 126018723