New clipboard handling notes (XFree86-xserv-4.3.0-31)

[Harold L Hunt II]

Alexander,

Good, thanks for reviewing the notes.

Harold

Alexander Gottwald wrote:

> 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
>