WM WINDOWPOSCHANGED

If this message has any of the values of the fl parameter of the SWP structure set, with the exception of the SWP_NOADJUST and SWP_NOREDRAW values, it is sent to the window procedure of the window whose position is changed. This message is also sent if the return value from the WM_ADJUSTWINDOWPOS is not NULL.

Syntax

param1
    PSWP    pswp;  /* SWP structures. */

param2
    ULONG   flAwp; /* Adjust window position status indicators. */

Parameters

pswp (PSWP) - Input

This points to two SWP structures. The first SWP structure describes the entire new window state, whereas the second structure describes the entire old window state. The fl parameter of the first structure contains only those indicators corresponding to the state changes that occurred.

flAwp (ULONG) - Input

Adjust window position status indicators. The AWF_* flags specify the state change of the frame window. The return value from the WM_ADJUSTWINDOWPOS message:

0: The SWP_NOADJUST option has been specified.
Other: Adjust window position status indicators.

Returns

ulReserved (ULONG) - returns: Reserved value, should be 0.

Remarks

The system sends this message after the window's size, position, or z-order has changed.

Default Processing

The default window procedure sets ulReserved to 0 and sends the following messages, based on the values of the fl parameter of the first SWP data structure:

SWP_SIZE: A WM_SIZE with the new window size from the first SWP structure.
SWP_HIDE: A WM_SHOW to hide the new window.
SWP_SHOW: A WM_SHOW to show the new window.

Examples

This example processes the WM_WINDOWPOSCHANGED message and assigns the two structures to pointers.

PSWP pswpNew, pswpOld;

case WM_WINDOWPOSCHANGED:
    pswpNew = PVOIDFROMMP(mp1);
    pswpOld = pswpNew + 1;