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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_LBUTTONDBLCLK
The WM_LBUTTONDBLCLK message is posted when the user double-clicks the left
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_LBUTTONDBLCLK
fwKeys = wParam; // key flags
xPos = LOWORD(lParam); // horizontal position of cursor
yPos = HIWORD(lParam); // vertical position of cursor
Parameters
fwKeys
Value of wParam. Indicates whether various virtual keys are down. This parameter can be any
combination of the following values:
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.
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xPos
Value of the low-order word of lParam. Specifies the x-coordinate of the cursor. The coordinate is relative to the
upper-left corner of the client area.
yPos
Value of the high-order word of lParam. Specifies the y-coordinate of the cursor. The coordinate is relative to the
upper-left corner of the client area.
Return Values
If an application processes this message, it should return zero.
Remarks
Only windows that have the CS_DBLCLKS style can receive WM_LBUTTONDBLCLK
messages, which Windows generates whenever 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_LBUTTONDOWN, WM_LBUTTONUP, WM_LBUTTONDBLCLK, and WM_LBUTTONUP again.
An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure.
See Also
GetCapture, GetDoubleClickTime, MAKEPOINTS, POINTS, SetCapture, SetDoubleClickTime, WM_LBUTTONDOWN, WM_LBUTTONUP
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Unix Manual Pages
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