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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| -
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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WM_PARENTNOTIFY
The WM_PARENTNOTIFY message is sent to the parent of a child window when the
child window is created or destroyed, or when the user clicks a mouse button
while the cursor is over the child window. When the child window is being created,
the system sends WM_PARENTNOTIFY just before the CreateWindow or CreateWindowEx function that creates the window returns. When the child window is being
destroyed, Windows sends the message before any processing to destroy the window
takes place.
WM_PARENTNOTIFY
fwEvent = LOWORD(wParam); // event flags
idChild = HIWORD(wParam); // identifier of child window
lValue = lParam; // child handle, or cursor coordinates
Parameters
fwEvent
Value of the low-order word of wParam. Specifies the event for which the parent is being notified. This parameter
can be one of the following values:
Value
| Meaning
| WM_CREATE
| The child window is being created.
| WM_DESTROY
| The child window is being destroyed.
| WM_LBUTTONDOWN
| The user has placed the cursor over the child window and has clicked the left
mouse button.
| WM_MBUTTONDOWN
| The user has placed the cursor over the child window and has clicked the
middle mouse button.
| WM_RBUTTONDOWN
| The user has placed the cursor over the child window and has clicked the right
mouse button.
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idChild
Value of the high-order word of wParam. If the fwEvent parameter is the WM_CREATE or WM_DESTROY value, idChild specifies the identifier of the child window. Otherwise, idChild is undefined.
lValue
Contains the handle of the child window, if the fwEvent parameter is the WM_CREATE or WM_DESTROY value; otherwise, lValue contains the x- and y-coordinates of the cursor. The x-coordinate is in the
low-order word and the y-coordinate is in the high-order word.
Return Values
If an application processes this message, it should return zero.
Remarks
This message is also sent to all ancestor windows of the child window,
including the top-level window.
All child windows, except those that have the WS_EX_NOPARENTNOTIFY extended
window style, send this message to their parent windows. By default, child
windows in a dialog box have the WS_EX_NOPARENTNOTIFY style, unless the CreateWindowEx function is called to create the child window without this style.
See Also
CreateWindow, CreateWindowEx, WM_CREATE, WM_DESTROY, WM_LBUTTONDOWN, WM_MBUTTONDOWN, WM_RBUTTONDOWN
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