What is the column width in a list control after double click on header

Posted on 2004-10-18
Last Modified: 2013-11-20
List control in report style.  I double click on the separator and the column is resized automatically.

I trap the HDN_DIVIDERDBLCLICK in a class derived from CListCtrl (notify message).  
I get the event BUT the width of the column is that BEFORE the double click.  I have passed the event onto the ListCtrl base class before querying the header for the new width.  I have even tried to strip out pending messages in the queue before getting the column width from the header - no effect.
Trapping the HDN_ENDTRACK notify message doesn't help either.

How can one respond to the double click event of the header and get the new column width?
Question by:AndyAinscow
LVL 14

Assisted Solution

RichieHindle earned 100 total points
ID: 12342411
If all else fails, use RegisterWindowMessage to register a private message, and post (not send) yourself one of those when the event happens.  Then in the handler for that message (which you set up using ON_REGISTERED_MESSAGE), look up the width and act upon the change.  By the time your message gets delivered, Windows will have sorted itself out and will report the correct width.
LVL 23

Accepted Solution

Roshan Davis earned 300 total points
ID: 12344768
LVL 23

Expert Comment

by:Roshan Davis
ID: 12344780
plz check - "Using the Header Control"

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LVL 23

Expert Comment

by:Roshan Davis
ID: 12344799
and one more, this describes the usage of ENDTRACK message
"Autofit Header Control"

LVL 55

Assisted Solution

by:Jaime Olivares
Jaime Olivares earned 100 total points
ID: 12346758
You can test the width of an individual cell, not the in the header.
LVL 44

Author Comment

ID: 12347523
RichieHindle - sounds good, not tested it.
jaime_olivares - correct about the width of a cell, unfortunately when I get the HDN_DIVIDERDBLCLICK the cell width is apparently still the same as the width in the header.
roshmon - some good links but I couldn't find anything new that helped directly.  However the HDN_ITEMCHANGED (not HDN_ITEMCHANGING) turned out to be my solution.  This event was fired with the correct width after resizing.  I needed to 'protect' my routine with a bool flag as I only wanted it to run after the drag/resize was finished.  The HDN_ITEMCHANGED was pumped many times during the drag resize but I could also trap the start of the drag and set a flag, release the flag at the end drag.
LVL 14

Expert Comment

ID: 12347705
Andy: Thanks for the summary, and for splitting the points.  If only everyone on EE were as thoughtful, it would be a better place.  8-)

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