Tk Library Source Code

There seems to be a bug when a tk listbox is embedded 
inside a BWidget paned window frame. I have tried 
putting the listbox outside of the frame and it works 
correctly. This problem does not occur in KDE or using a 
vnc. Is this a tcl/tk bug or is there some default setting 
in Gnome or Ximian that needs to be changed in order 
for the double-click event to be recognized? 

Don

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Is this still an issue ?

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(I'm able to replicate the problem -- Debian sarge, using
metacity WM under Gnome).

Jason Tang posted an analysis of the problem to
comp.lang.tcl  (news:[email protected]),
suggesting that the problem may be caused by (1) some WMs
intercepting ButtonPress-1 events and generating multiple
events in response combined with (2) the fixed
EVENT_BUFFER_SIZE in tkBind.c.  

Specifically, a ButtonPress-1 ends up generating multiple
EnterNotify events; if the window hierarchy is too deep,
Tk's event buffer overflows, preventing the double-click
detection logic from working.

In a quick test, doubling EVENT_BUFFER_SIZE makes the
attached double-click-bug.tcl work as expected.

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It works fine with other X servers, but what about Gnome 
and Ximian?

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this works find on my SuSE8.2 box, using CDE, KDE and Xwin32
as X servers.

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I have tested this script using Gnome and Ximian.

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OK, here is a much smaller example. Neither scripts work 
regardless...

#! /usr/bin/wish
package require BWidget

set tlist [list  "element1" "element2"]
set mainframe [MainFrame .mainframe]
set topf  [frame [$mainframe getframe].topf]

 # Paned Windows and Frames
set pw1   [PanedWindow $topf.pw -side top]
set pane  [$pw1 add ]
set pw2   [PanedWindow $pane.pw2 -side left]
set tpane [$pw2 add -weight 3] 
set tbox [TitleFrame $tpane.tbox -text "Widgets"]

set sw_t [ScrolledWindow [$tbox getframe].sw -auto both]
set tlistbox [listbox [$sw_t getframe].tlistbox -height 18 -
width 20 -highlightthickness 0 -listvar ::tlist] 
$sw_t setwidget $tlistbox
bindtags $tlistbox [linsert [bindtags $tlistbox] 3 tlist_Tag]  
bind tlist_Tag <Double-Button-1> {puts HI}

# Placing layout frames and major subframes
pack $mainframe -fill both -expand yes
pack $topf -fill both -expand yes 
pack $pw1 -fill both -expand yes
pack $pw2 -fill both -expand yes 
pack $tbox -padx 2 -side left -fill both -expand yes
pack $sw_t -fill both -expand yes

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You need to provide a much smaller example demonstrating the
problem.

package require BWidget
PanedWindow .p
.p add
.p add
set lb [listbox [.p getframe 0].list -bg white]
set tb [text [.p getframe 1].text -bg yellow]
pack $lb -fill both -expand 1
pack $tb -fill both -expand 1
pack .p -fill both -expand 1
foreach c [info vars] { $lb insert end $c }
bind $lb <Double-Button-1> [list $tb insert end "CLICK\n"]


Given this sample code, I don't see any problem.

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Has anyone had a chance to look at this problem? Is this a 
tcl/tk bug?

File Added - 59873: double-click-bug.tcl