The WM_MBUTTONDBLCLK message is posted when the user double-clicks the middle mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_MBUTTONDBLCLK
fwKeys = wParam; // key flags
xPos = LOWORD(lParam); // horizontal position of cursor
yPos = HIWORD(lParam); // vertical position of cursor
Value | Description |
---|---|
MK_CONTROL | Set if the ctrl key is down. |
MK_LBUTTON | Set if the left mouse button is down. |
MK_MBUTTON | Set if the middle mouse button is down. |
MK_RBUTTON | Set if the right mouse button is down. |
MK_SHIFT | Set if the shift key is down. |
If an application processes this message, it should return zero.
Only windows that have the CS_DBLCLKS style can receive WM_MBUTTONDBLCLK messages, which the system generates whenever the user presses, releases, and again presses the middle mouse button within the system's double-click time limit. Double-clicking the middle mouse button actually generates four messages: WM_MBUTTONDOWN, WM_MBUTTONUP, WM_MBUTTONDBLCLK, and WM_MBUTTONUP again.
An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winuser.h.
Mouse Input Overview, Mouse Input Messages, GetCapture, GetDoubleClickTime, MAKEPOINTS, POINTS, SetCapture, SetDoubleClickTime, WM_MBUTTONDOWN, WM_MBUTTONUP