The HDN_BEGINTRACK notification message notifies a header control’s parent window that the user has begun dragging a divider in the control (that is, the user has pressed the left mouse button while the mouse cursor is on a divider in the header control). This notification message is sent in the form of a WM_NOTIFY message.
HDN_BEGINTRACK phdn = (HD_NOTIFY FAR *) lParam;
Returns FALSE to allow tracking of the divider or TRUE to prevent tracking.
file: /Techref/os/win/api/win32/mess/src/msg08_12.htm, 1KB, , updated: 2000/4/7 11:20, local time: 2024/12/4 19:52,
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