; docformat = 'rst'

function visgrabstracttreemaplayout__totalSize, items, startPos, endPos
  compile_opt strictarr
  
  totalSize = 0.0
  for i = startPos, endPos do begin
    (items->get(position=i))->getProperty, size=itemSize
    totalSize += itemSize
  endfor
  
  return, totalSize
end


pro visgrabstracttreemaplayout__sliceLayout, items, startPos, endPos, bounds, vertical=vertical, ascending=ascending
  compile_opt strictarr

  totalSize = visgrabstracttreemaplayout__totalSize(items, startPos, endPos)
  a = 0.0
  
  for i = startPos, endPos do begin
    r = obj_new('Rect')
    item = items->get(position=i)
    item->getProperty, size=itemSize
    b = itemSize / totalSize
    bounds->getProperty, x=boundsX, y=boundsY, height=boundsHeight, width=boundsWidth
    if (keyword_set(vertical)) then begin
      r->setProperty, x=boundsX, width=boundsWidth, height=boundsHeight * b, $
                      y=keyword_set(ascending) $
                        ? boundsY + boundsHeight * a $ 
                        : boundsY + boundsHeight * (1 - a - b)
                      
    endif else begin
      r->setProperty, y=boundsY, width=boundsWidth * b, height=boundsHeight, $
                      x=keyword_set(ascending) $
                        ? boundsX + boundsWidth * a $ 
                        : boundsX + boundsWidth * (1 - a - b)    
    endelse
    item->setProperty, bounds=r
    a += b
  endfor
end

    
function visgrabstracttreemaplayout::sortDescending, items
  compile_opt strictarr

  count = items->count()
  if (count eq 0L) then return, items
  
  itemArray = objarr(count)
  sizes = fltarr(count)
  for i = 0L, count - 1L do begin
    item  = items->get(position=i)
    item->getProperty, size=size
    sizes[i] = size
  endfor
  
  ind = sort(sizes)
  itemArray = itemArray[ind]
  
  items->remove, /all
  items->add, itemArray
  
  return, items
end


;+
; :Abstract:
;
; :Params:
;    model : in, required, type=VISgrTreemapModel
;    bounds : in, required, type=VISgrRect
;-
pro visgrabstracttreemaplayout::layout, model, bounds
  compile_opt strictarr
  
end


; TODO: implement rest of methods

pro visgrabstracttreemaplayout__define
  compile_opt strictarr

  define = { VISgrAbstractTreemapLayout, inherits VISgrTreemapLayout }
end