SAMPLE: Expanding the Size of a Dialog Box

Last reviewed: February 15, 1996
Article ID: Q35499

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) for Windows versions 3.0 and 3.1

SUMMARY

The EXPAND file in the Software Library demonstrates how to create a dialog box that expands to provide additional controls when the user clicks on a button control.

Download EXPAND.EXE, a self-extracting file, from the Microsoft Software Library (MSL) on the following services:

Microsoft Download Service (MSDL)

      Dial (206) 936-6735 to connect to MSDL
      Download EXPAND.EXE (size: 19505 bytes)

Internet (anonymous FTP)

      ftp ftp.microsoft.com
      Change to the \SOFTLIB\MSLFILES directory
      Get EXPAND.EXE (size: 19505 bytes)

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

MORE INFORMATION

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 reference words: 3.00 3.10 softlib EXPAND.EXE
KBCategory: kbprg kbfile
KBSubcategory: UsrDlgs

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Last reviewed: February 15, 1996
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