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. |
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