SBM SETTHUMBSIZE

This message sets the scroll bar slider size.

Syntax

param1
SHORT svisible;   /* Size of the visible part of the document. */
SHORT stotal;     /* Size of the entire document. */

param2
ULONG ulReserved;   /* Reserved value, should be 0. */

Parameters

svisible (SHORT) - Input

Size of the visible part of the document.

stotal (SHORT) - Input

Size of the entire document.

ulReserved (ULONG) - Input

Reserved value, should be 0.

Returns

rc (BOOL) - returns

Success indicator.

TRUE: Successful completion

FALSE: Error occurred.

Remarks

The scroll bar control window procedure responds to this message by setting the size of the slider proportional to the visible part of the document. If the visible part exceeds or is equal to the entire document the scroll bar is disabled, otherwise the scroll bar is enabled.

The scroll bar is redrawn to reflect the change.

Default Processing

The default window procedure does not expect to receive this message and therefore takes no action on it.