The WM_NCLBUTTONDBLCLK message is posted when the user double-clicks the left mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCLBUTTONDBLCLK nHittest = (INT) wParam; // hit-test value pts = MAKEPOINTS(lParam); // position of cursor
If an application processes this message, it should return zero.
The DefWindowProc function tests the given point to find out the location of the cursor and performs the appropriate action. If appropriate, DefWindowProc sends the WM_SYSCOMMAND message to the window.
A window need not have the CS_DBLCLKS style to receive WM_NCLBUTTONDBLCLK messages.
Windows generates a WM_NCLBUTTONDBLCLK message when the user presses, releases, and again presses the left mouse button within the system’s double-click time limit. Double-clicking the left mouse button actually generates four messages: WM_NCLBUTTONDOWN, WM_NCLBUTTONUP, WM_NCLBUTTONDBLCLK, and WM_NCLBUTTONUP again.
An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure.
DefWindowProc, MAKEPOINTS, POINTS, WM_NCHITTEST, WM_NCLBUTTONDOWN, WM_NCLBUTTONUP, WM_SYSCOMMAND
file: /Techref/os/win/api/win32/mess/src/msg26_6.htm, 2KB, , updated: 2000/4/7 12:20, local time: 2024/9/2 05:12,
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