The TVM_SETINDENT message sets the width of indentation for a tree-view control and redraws the control to reflect the new width. You can send this message explicitly or by using the TreeView_SetIndent macro.
TVM_SETINDENT
wParam = (WPARAM) indent;
lParam = 0;
Parameters
indent
Width, in pixels, of the indentation. If this parameter is less than the system-defined minimum width, the new width is set to the system-defined minimum.
Return Values
No return value.
See Also