Re: ftextLines and the detached message display

> From:  Brent Welch <[email protected]>
> Date:  Fri, 21 Jan 2005 21:39:37 -0800
>
> Yeah, I noticed this too, and punted.  The problem is there is
> no easy way to ask the Tk text widget how many lines are displayed.
> Well, it isn't impossible, but you have to reverse engineer it by
> asking what the index is at a particular X, Y location based on
> the window size.  
> 
> So, I think the "right" think is to bind something to the Configure event
> on a window. That is triggered when the window changes size.  That bit
> of code should be something like (I haven't tested this)
> 
> bind $exwin(ftoc) <Configure> FtocDeduceSize
> proc FtocDeduceSize {} {
>   global exwin
>   set h [winfo height $exwin(ftext)]
>   set w [winfo width $exwin(ftext)]
>   set ix [$exwin(ftext) index @[expr $height-1],[expr $width-1] ]
>   set exwin(ftextLines) [lindex [split $ix .] 0]
> }
> 
> You pretty much have to use the same algorithm whenever you want to
> do this, and binding to the Configure event means you only do it
> when the window changes size.

Your untested code was close enough for me to figure out.  The only odd thing 
is that now ExwinFixupFtextLines gets called repeatedly while you resize the 
window.  I'm going to leave it like that for now since I'm not noticing any
issues caused by it.

Chris

-- 
Chris Garrigues                         Trinsic Solutions
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