WM_HSCROLL - Parameters
usidentifier (USHORT)
Scroll
bar control window identifier.
sslider (SHORT)
Slider
position.
- Either the operator is not moving the slider with
the pointer device, or for the instance where uscmd is SB_SLIDERPOSITION
the pointer is outside the tracking rectangle when the button is released.
Other
uscmd (USHORT)
Command.
SB_LINELEFT
Sent if the operator clicks on the
left arrow of the scroll bar, or depresses the VK_LEFT key.
SB_LINERIGHT
Sent if the operator clicks on the right arrow
of the scroll bar, or depresses the VK_RIGHT key.
SB_PAGELEFT
Sent if the operator clicks on the area to the
left of the slider, or depresses the VK_PAGELEFT key.
SB_PAGERIGHT
Sent if the operator clicks on the area to the
right of the slider, or depresses the VK_PAGERIGHT key.
SB_SLIDERPOSITION
Sent to indicate the final position of the slider.
SB_SLIDERTRACK
If the operator
moves the scroll bar slider with the pointer device, this is sent every
time the slider position changes.
SB_ENDSCROLL
Sent
when the operator has finished scrolling, but only if the operator has not
been doing any absolute slider positioning.
ulReserved (ULONG)
Reserved
value, should be 0.
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