A horizontal pane arranges its subwindows in a single row. See also
 
pane%.
| (new horizontal-pane% |   |  |   |   | [parent parent] |   |  |   |  [ | [vert-margin vert-margin] |   |  |   |   | [horiz-margin horiz-margin] |   |  |   |   | [border border] |   |  |   |   | [spacing spacing] |   |  |   |   | [alignment alignment] |   |  |   |   | [min-width min-width] |   |  |   |   | [min-height min-height] |   |  |   |   | [stretchable-width stretchable-width] |   |  |   |   | [stretchable-height stretchable-height]]) |   |  
  | 
|  → (is-a?/c horizontal-pane%) | 
 | 
|   vert-margin : (integer-in 0 1000) = 0 | 
|   horiz-margin : (integer-in 0 1000) = 0 | 
|   border : (integer-in 0 1000) = 0 | 
|   spacing : (integer-in 0 1000) = 0 | 
|    | alignment |   | : |   |  |  |   |   |   | = |   | '(left center) |  
  | 
|   min-width : (integer-in 0 10000) = graphical-minimum-width | 
|   min-height : (integer-in 0 10000) = graphical-minimum-height | 
|   stretchable-width : any/c = #t | 
|   stretchable-height : any/c = #t | 
For information about the 
horiz-margin and 
vert-margin
    arguments, see 
subarea<%>. For information about the 
border, 
spacing, and 
alignment
    arguments, see 
area-container<%>. For information about the
    
min-width, 
min-height, 
stretchable-width, and
    
stretchable-height arguments, see 
area<%>.