Combo Boxes!

Sanford H. Selznick

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Dec 25, 1996, 3:00:00 AM12/25/96

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How do I set the height of a pop down drop list of a combo box? I see
CB_SETDROPPEDWIDTH, but no "CB_SETDROPPEDHEIGHT". The closest relative I
can find is CB_SETITEMHEIGHT, and I don't think it is what I am looking
for.

The combo box is in a modeless dialog box, and has a vertical scrollbar,
and no integral height. It is of type "Drop List" and is set to "No" owner
draw. I am unable to make it any taller in the MS developer studio.

Thanks!
Sanford

Doug Stevens

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Dec 26, 1996, 3:00:00 AM12/26/96

to Sanford H. Selznick

Sanford H. Selznick wrote:
> The combo box is in a modeless dialog box, and has a vertical scrollbar,
> and no integral height. It is of type "Drop List" and is set to "No" owner
> draw. I am unable to make it any taller in the MS developer studio.

In the studio, do the following:

Set the type to a regular list box.
Set the height to whatever you want the drop-down height of the
combo box to be.
Set the type back to a combo box.

Brad Wilson

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Dec 27, 1996, 3:00:00 AM12/27/96

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> How do I set the height of a pop down drop list of a combo box?

The height of the control is the height of the drop down.

--
Brad Wilson Custom software development & solutions
cru...@pobox.com Internet and intranet consulting services
The Brads' Consulting Windows NT/Windows 95 software development
http://www.thebrads.com Web site planning, development and maintenance
Content (C) 1996 Brad Wilson; no reproduction without authorization

Katy Mulvey

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Dec 27, 1996, 3:00:00 AM12/27/96

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Sanford H. Selznick <san...@cs.arizona.edu> wrote in article
<sanford-ya0236800...@news.cs.arizona.edu>...

> How do I set the height of a pop down drop list of a combo box? I see
> CB_SETDROPPEDWIDTH, but no "CB_SETDROPPEDHEIGHT". The closest relative I
> can find is CB_SETITEMHEIGHT, and I don't think it is what I am looking
> for.
>

> The combo box is in a modeless dialog box, and has a vertical scrollbar,
> and no integral height. It is of type "Drop List" and is set to "No"
owner
> draw. I am unable to make it any taller in the MS developer studio.

Use SetWindowPos. Remember to include the height of the associated
edit box, too. So, something like:

void set_DropDownSize(CComboBox& box, UINT LinesToShow)
// Notes:
// 1) use SM_CYBORDER for Win3.x or NT
// 2) This won't work for owner-draw variable height combo boxes
// 3) This won't work for a subclassed combo with a horizontal scroll bar
// 4) Call this function after creating the combo box and after a
// WM_SETTINGCHANGE message.
{
ASSERT(IsWindow(box)); // Window must exist or SetWindowPos won't work

CRect cbSize; // current size of combo box
int Height; // new height for drop-down portion of combo box

box.GetClientRect(cbSize);
Height = box.GetItemHeight(-1); // start with size of the edit-box
portion
Height += box.GetItemHeight(0) * LinesToShow; // add height of lines of
text

// Note: The use of SM_CYEDGE assumes that we're using Windows '95
// Now add on the height of the border of the edit box
Height += GetSystemMetrics(SM_CYEDGE) * 2; // top & bottom edges

// The height of the border of the drop-down box
Height += GetSystemMetrics(SM_CYEDGE) * 2; // top & bottom edges

// now set the size of the window
box.SetWindowPos(NULL, // not relative to any other windows
0, 0, // TopLeft corner doesn't change
cbSize.right, Height, // existing width, new height
SWP_NOMOVE | SWP_NOZORDER // don't move box or change z-ordering.
);
}

To change the size in Developer Studio, click on the drop-down arrow.
Notice the extremely subtle change (the highlighted grab handles move
from the left/right to top/bottom) and resize the combo.

--
Katy Mulvey k...@ormec.com
Software Development Engineer
ORMEC Systems http://www.ormec.com

scs0

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Dec 10, 2004, 4:43:50 PM12/10/04

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I know Microsoft left good design principles at the door when
developing the Windows API, but this functionality can't possibly be
this complicated. I know this is an ancient thread, but does anyone
know the real way to specify the height of the listbox of a combo box?

James Brown

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Dec 10, 2004, 6:52:01 PM12/10/04

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Use MoveWindow / SetWindowPos, using the
combobox window handle - the height parameter should
be how tall you want the drop-list to be.

--
James
---
www.catch22.net
Free win32 software, sourcecode and tutorials
-----
Please de-spam my email address before replying.
"scs0" <sc...@vol.com> wrote in message
news:1102715030.5...@z14g2000cwz.googlegroups.com...

Tim Robinson

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Dec 10, 2004, 6:52:57 PM12/10/04

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I had to go to Google Groups to find out what you're talking about
(http://groups-beta.google.com/group/comp.os.ms-windows.programmer.win32/browse_thread/thread/d117157bd104400b?safe=images&as_umsgid=1102715030.5...@z14g2000cwz.googlegroups.com&lr=&hl=en),
but the method explained in the original thread is the real way: when
creating the combo box, the height you give you CreateWindow determines
the height of the list box.

--
Tim Robinson (MVP, Windows SDK)
http://mobius.sourceforge.net/