The framework calls this member function when the user clicks a window's horizontal scroll bar.
afx_msg void OnHScroll(
UINT nSBCode,
UINT nPos,
CScrollBar* pScrollBar
);
Parameters
nSBCode
Specifies a scroll-bar code that indicates the user's scrolling request. This parameter can be one of the following: SB_LEFT Scroll to far left. SB_ENDSCROLL End scroll. SB_LINELEFT Scroll left. SB_LINERIGHT Scroll right. SB_PAGELEFT Scroll one page left. SB_PAGERIGHT Scroll one page right. SB_RIGHT Scroll to far right. SB_THUMBPOSITION Scroll to absolute position. The current position is specified by the nPos parameter. SB_THUMBTRACK Drag scroll box to specified position. The current position is specified by the nPos parameter. nPos
Specifies the scroll-box position if the scroll-bar code is SB_THUMBPOSITION or SB_THUMBTRACK; otherwise, not used. Depending on the initial scroll range, nPos may be negative and should be cast to an int if necessary. pScrollBar
If the scroll message came from a scroll-bar control, contains a pointer to the control. If the user clicked a window's scroll bar, this parameter is NULL. The pointer may be temporary and should not be stored for later use.
afx_msg void OnHScroll(
UINT nSBCode,
UINT nPos,
CScrollBar* pScrollBar
);
Parameters
nSBCode
Specifies a scroll-bar code that indicates the user's scrolling request. This parameter can be one of the following: SB_LEFT Scroll to far left. SB_ENDSCROLL End scroll. SB_LINELEFT Scroll left. SB_LINERIGHT Scroll right. SB_PAGELEFT Scroll one page left. SB_PAGERIGHT Scroll one page right. SB_RIGHT Scroll to far right. SB_THUMBPOSITION Scroll to absolute position. The current position is specified by the nPos parameter. SB_THUMBTRACK Drag scroll box to specified position. The current position is specified by the nPos parameter. nPos
Specifies the scroll-box position if the scroll-bar code is SB_THUMBPOSITION or SB_THUMBTRACK; otherwise, not used. Depending on the initial scroll range, nPos may be negative and should be cast to an int if necessary. pScrollBar
If the scroll message came from a scroll-bar control, contains a pointer to the control. If the user clicked a window's scroll bar, this parameter is NULL. The pointer may be temporary and should not be stored for later use.
是指向控件的句柄吗?我英语学的不好