ID Number: Q70080
3.00
WINDOWS
Summary:
Whenever Windows version 3.0 creates a new multiple-document interface
(MDI) child window in response to a WM_MDICREATE message, it makes
that child window visible.
The information below describes how to create a hidden MDI child
window without causing an unattractive "flash" on the screen as the
window is created visible and then hidden. This information applies to
applications created with the Windows Software Development Kit (SDK)
version 3.0.
More Information:
A code fragment such as the following can be used to create an
invisible MDI child:
MDICREATESTRUCT mcs; // structure to pass with WM_MDICREATE
HWND hWndMDIClient; // the MDI client window
HWND hwnd; // temporary window handle
...
// assume that we have already filled out the MDICREATESTRUCT...
// turn off redrawing in the MDI client window
SendMessage(hwndMDIClient, WM_SETREDRAW, FALSE, 0L);
/*
* Create the MDI child. It will be created visible, but will not
* be seen because redrawing to the MDI client has been disabled
*/
hwnd = (WORD)SendMessage(hwndMDIClient,
WM_MDICREATE,
0,
(LONG)(LPMDICREATESTRUCT)&mcs);
// hide the child
ShowWindow(hwnd, SW_HIDE);
// turn redrawing in the MDI client back on,
// and force an immediate update
SendMessage(hwndMDIClient, WM_SETREDRAW, TRUE, 0L);
InvalidateRect( hwndMDIClient, NULL, TRUE );
UpdateWindow( hwndMDIClient );
...
For more information on the Windows 3.0 MDI, query on the following
words:
prod(winsdk) and MDI