Re: Variable Colored List Box

From:
"Doug Harrison [MVP]" <dsh@mvps.org>
Newsgroups:
microsoft.public.vc.mfc
Date:
Thu, 14 May 2009 13:14:03 -0500
Message-ID:
<vbno05dl1h7ao7u32oqsqau72emlq1tsqm@4ax.com>
On Thu, 14 May 2009 10:45:58 -0700 (PDT), davep15@gmail.com wrote:

First off I'd like to make it clear that programing with MFC is
somewhat new to me, I've done some basic stuff with it before but
windows (or any OS for that matter) programing isn't usually where I
program.

I'm using Visual Studio 2005 Professional

I have a list box that represents a lot of data on a remote device. I
am going to be slowly downloading it (lot of data for the link)
I want to represent to the user the status of each entry in the list
in a visually easy way, I was thinking changing the text color of the
entries would be the way to go. (Probably do something like, Yellow:
not started, Green: Downloading, Red: Error, Black: Retrieved
Successfully) The implementation of this is my issue though.

From what I've gathered this is not something available by default so
I'm trying to modify the existing CListBox to do it and I found a few
examples I can't get to work, probably because they were written pre
2005 and I can't seam to adapt them to VS2005.

The most promising was from http://www.codersource.net/mfc_clistbox_font.html
I followed the instructions there as best I could, had to re figure
out a few items because there doesn't appear to be a "Class Wizard"
anymore. I created a test project, thew in a ListBox and assigned it a
variable, went to where the varaible was defined and changed the
CListBox type to colored_list. Created a class that inhearets CListBox
class colored_list : public CListBox
and replaced the DrawItem function
void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
and impelemted the new one as exampled there
void colored_list::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
problem is it still runs the old DrawItem not my new one.


I'm not sure what you mean by the "old DrawItem". The default
implementation is:

void CListBox::DrawItem(LPDRAWITEMSTRUCT)
    { ASSERT(FALSE); }

If that function is getting called, you haven't overridden it correctly in
your derived class, but the function declaration you gave matches, so that
suggests otherwise. I'm going to guess the list is drawing itself normally,
which means you didn't give it the correct owner-draw style in the resource
editor. So double-check the style in the resource editor.

Any ideas where to find a more up to date example or to simply get
mine to actually run the new code would be greatly appreciated.


Did you look at codeproject.com? See this page for some samples (it covers
both combo and list boxes):

http://www.codeproject.com/KB/combobox/

--
Doug Harrison
Visual C++ MVP

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