An application sends an LB_SETTABSTOPS message to set the tab-stop positions in a list box.
LB_SETTABSTOPS
wParam = (WPARAM) cTabs; // number of tab stops
lParam = (LPARAM) (LPINT) lpnTabs; // address of tab-stop array
Parameters
cTabs
Value of wParam. Specifies the number of tab stops in the list box.
lpnTabs
Value of lParam. Points to the first member of an array of integers containing the tab stops, in dialog box units. The tab stops must be sorted in ascending order; backward tabs are not allowed.
Return Values
If all the specified tabs are set, the return value is TRUE; otherwise, it is FALSE.
Remarks
To respond to the LB_SETTABSTOPS message, the list box must have been created with the LBS_USETABSTOPS style.
If cTabs parameter is 0 and lpnTabs is NULL, the default tab stop is two dialog box units. If cTabs is 1, the list box will have tab stops separated by the distance specified by lpnTabs.
If lpnTabs points to more than a single value, a tab stop will be set for each value in lpnTabs, up to the number specified by cTabs.
A dialog box unit is a horizontal or vertical distance. One horizontal dialog box unit is equal to 0.25 of the current dialog box base-width unit. These units are computed based on the height and width of the current system font. The GetDialogBaseUnits function returns the current dialog box base units, in pixels.
See Also