''[MGS]'' [[2003/09/20] - Sometimes it is necessary/desirable to bind to a toplevel window. For example, I might want to withdraw a toplevel window, instead of having it iconify, when clicking the minimize button. There are several ways to do this:

'''1.''' Bind directly to the window name. e.g.

   bind . <Unmap> [list wm withdraw .]

However, the binding will trigger if you decide to unmanage any of the window's child widgets, due to their default binding tags.

'''2.''' Bind to the toplevel window's class. e.g.

   bind [winfo class .] <Unmap> [list wm withdraw %W]
However, this binding will fire for all windows with the same class as '''.''' .

'''3.''' Create a new binding tag for the toplevel window and then create the binding to that tag. e.g.

  bindtags . [list . bind. [winfo class .] all]
  bind bind. <Unmap> [list wm withdraw %W]

or more generally:

  set W [toplevel .mywin]
  bindtags $W [linsert [bindtags $W] 1 bind$W]
  bind bind$W <Unmap> [list wm withdraw %W]

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[RUJ]: Hi, I would like to know ... How to bind a "Leave" command to main toplevel but it should be work on its child widgets also.
I want to make popupwindow which will have some entries and labels & this window should destroyed after cursor moved away from window.

[MJ] - Just destroy the toplevel and all its child widgets are destroyed as well. In the <Leave> event binding make sure you only call the destroy when the toplevel is closed. Leaving a child widget will also call the binding, because the toplevel is in every child widget's [bindtags] list.

 toplevel .l
 bind .l <Leave> {tlclose %W}
 proc tlclose {w} {if {$w == [winfo toplevel $w]} {destroy $w}}

[RUJ]: Thanking you it is working very well.
Before that i was trying by,
 set destroyScript [list destroy $wa]
 bind $wa <Enter> [list after cancel $destroyScript]
 bind $wa <Leave> $destroyScript
 
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[RUJ]: hello MJ, I am trying to use above code for dragging window but it not working.
this is the code giving error of expression syntax.
 set ::moveable 0
 wm overrideredirect $wa 1
 bind $wa <ButtonPress> {set ::moveable 1}
 bind $wa <ButtonRelease> {set ::moveable 0}
 bind $wa <Motion> {if {!$::moveable} {break}; if {%W == [winfo toplevel %W]} {wm geometry [winfo toplevel %W] +[expr %X-5]+[expr %Y-5]} }

The first part of the solution is to move all that code to a proc. Unless you have a specific reason to do otherwise you should stick to the rule of thumb "''never have more than one command in a binding''". It makes writing and maintaining code like this soooo much easier.

Try this:

 bind $wa <Motion> [list handleMotionEvent %W %X %Y]
 proc handleMotionEvent {w x y} {
     if {! $::moveable} return
     set top [winfo toplevel $w]
     if {$w ne $top} return
 
     wm geometry $top +[expr {$x-5}]+[expr {$y-5}]
 }

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See also:

   * [bind]
   * [bindtags]
   * [toplevel]