WM_HSCROLL Field - uscmd

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.

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