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, the system 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
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. |
If an application processes this message, it should return zero.
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.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winuser.h.
Windows Overview, Window Messages, CreateWindow, CreateWindowEx, WM_CREATE, WM_DESTROY, WM_LBUTTONDOWN, WM_MBUTTONDOWN, WM_RBUTTONDOWN