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WM_LBUTTONDOWN (Compact 2013)

  • 项目

3/28/2014

This message is posted when the user presses the touch screen in the client area of a window or presses the left mouse button while the cursor is located within the client area of a window. If another window does not capture the mouse or stylus event, the OS posts the message to the window beneath the stylus or mouse. If another window does capture the mouse or stylus, the OS posts the message to the window that has the capture.

Syntax

WM_LBUTTONDOWN fwKeys = wParam; 
    xPos = LOWORD(lParam); 
    yPos = HIWORD(lParam);

Parameters

  • fwKeys
    Indicates the mouse buttons and keys that the user pressed. The following table shows the possible values, which can be combined.

    Value

    Description

    MK_CONTROL

    The user pressed the CTRL key.

    MK_LBUTTON

    The user pressed the left mouse button.

    MK_LBUTTONUP

    The left mouse button is up.

    MK_RBUTTON

    The user pressed the right mouse button.

    MK_SHIFT

    The user pressed the SHIFT key.
  • xPos
    Value of the low-order word of lParam. Specifies the x-coordinate of the cursor, 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, relative to the upper-left corner of the client area.

Return Value

An application should return zero if it processes this message.

Requirements

Header

windows.h

See Also

Reference

Mouse Messages
GetCapture
SetCapture
WM_LBUTTONDBLCLK
WM_LBUTTONUP