Expand.exe Expands the Size of a Dialog Box

ID: Q35499

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1

SUMMARY

Expand.exe is a sample that demonstrates how to create a dialog box that expands to provide additional controls when the user clicks on a button control.

MORE INFORMATION

The following files are available for download from the Microsoft Download Center. Click the file names below to download the files:

Expand.exe

For more information about how to download files from the Microsoft Download Center, please visit the Download Center at the following Web address

http://www.microsoft.com/downloads/search.asp

and then click How to use the Microsoft Download Center.

The remainder of this article describes the algorithm demonstrated in the EXPAND file.

To use an expanding dialog box in an application, perform the following two preparation steps:

Design the entire dialog box and determine what controls will not be initially visible.

Disable these hidden controls in the dialog box template by including the WS_DISABLED style bit. This prevents the TAB key or the appropriate mnemonic key from giving the focus to one of the hidden controls.

When the user clicks the "expand" button, perform the following five steps:

Disable the expand button using EnableWindow(hWnd, FALSE).

Enable the previously hidden controls using EnableWindow(hWnd, TRUE).

Use SetFocus() to place the focus on the appropriate control.

Use the following function to retrieve the current position and size of the dialog:
GetWindowRect(hWndDlg, (LPRECT)&r);

Use the following function to expand the dialog to its new size
MoveWindow(hWndDlg, r.left, r.top, r.right - r.left,
(r.bottom - r.top) + change, TRUE);
where "change" is the difference between the small size and the large size.

Note that the MoveWindow() function can be used to expand a window in any direction.

Additional query words:

Keywords : kbfile kbsample kbDlg kbGrpUser kbWinOS310 kbWinOS300
Version : WINDOWS:3.0,3.1
Platform : WINDOWS
Issue type :