TIP #84: ADD CONTROL FOR MOUSE MOVEMENT FILTERING 
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 Version:      $Revision: 1.5 $
 Author:       Jyrki Alakuijala <Jyrki.Alakuijala_at_iki.fi>
               Jeff Hobbs <JeffH_at_ActiveState.com>
 State:        Final
 Type:         Project
 Tcl-Version:  8.4
 Vote:         Done
 Created:      Tuesday, 26 February 2002
 URL:          https://tip.tcl-lang.org84.html
 Post-History: 

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 ABSTRACT 
==========

 When the mouse is moved, the Tcl/Tk system eats most of the mouse 
 movement events and only the last movement event when Tcl/Tk is not 
 busy is stored in the event queue. I would like to obtain all the 
 movement events from the X-server or the Windows UI. 

 RATIONALE 
===========

 I have an artistic drawing program where I need to track mouse as 
 accurately as possible. At the moment I poll the /XQueryPointer()/ in 
 the busy loops to create (pseudo)events in the C-side of the code to 
 compensate for the missing events, but (of course) this does not work 
 in Windows. 

 I would like to have an option for the widget system or for the window 
 control so that a window (or, alternatively all the windows) could 
 receive all the movement events instead of only the last buffered one. 

 This has been a problem for me since 1995 and has - at many times - 
 caused me to consider changing the widget system. 

 IMPLEMENTATION 
================

       int Tk_CollapseMotionEvents(Display *display, int collapse)

 A reference implementation is SF Tk patch 564642, which adds a flag to 
 the TkDisplay that specifies whether motions events should be collapsed 
 or not. The default is the current behavior of collapsing these events. 

 COPYRIGHT 
===========

 This document has been placed in the public domain. 

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