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#define INCL_WINMESSAGEMGR
 
WM_HSCROLL
id = SHORT1FROMMP(mp1);       /* control-window identifier */
sPos = SHORT1FROMMP(mp2);     /* slider position           */
usCmd = SHORT2FROMMP(mp2);    /* command                   */
 
The WM_HSCROLL message is posted to the owner of a horizontal scroll-bar
window when an event occurs.
 
Parameter  Description
────────────────────────────────────────────────────────────────────────────
 
id         Low word of mp1. Identifies the scroll-bar window.
 
sPos       Low word of mp2. Specifies the slider position.
 
usCmd      High word of mp2. Specifies the type of command. This parameter
           can be one of the following values:
 
           Value              Meaning
           ─────────────────────────────────────────────────────────────────
           SB_LINELEFT        The user clicked the left scroll-bar arrow or
                              pressed the VK_LEFT key.
 
           SB_LINERIGHT       The user clicked the right scroll-bar arrow or
                              pressed the VK_RIGHT key.
 
           SB_PAGELEFT        The user clicked the area to the left of the
                              slider.
 
           SB_PAGERIGHT       The user clicked the area to the right of the
                              slider.
 
           SB_SLIDERPOSITION  The sPos parameter contains the final position
                              of the slider.
 
           SB_SLIDERTRACK     The user is dragging the slider. This value is
                              sent whenever the slider position changes.
 
           SB_ENDSCROLL       The user has finished scrolling. This value is
                              set only if the user was not doing an absolute
                              slider movement.
 
Return Value
 
An application should return zero if it processes this message.
 
See Also
 
WM_HSCROLLCLIPBOARD, WM_VSCROLL
 
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