WM_VSCROLL Field - uscmd

uscmd (USHORT)

Command.

SB_LINEUP

Sent if the operator clicks on the up arrow of the scroll bar, or presses the VK_UP key.
SB_LINEDOWN
Sent if the operator clicks on the down arrow of the scroll bar, or presses the VK_DOWN key.
SB_PAGEUP
Sent if the operator clicks on the area above the slider, or presses the VK_PAGEUP key.
SB_PAGEDOWN
Sent if the operator clicks on the area below the slider, or presses the VK_PAGEDOWN 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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