2. Column tree

Nesting columns to tree levels

• Every column can have defined its level of nesting in tree by

  L

  attribute.
  The root level, that can be expanded, has L = 0, the not expandable level outside the tree is defined by L = -1.
  The next column should have defined the L maximally as L + 1 of its previous column to be its child.
  
• Column tree must be permitted by Cfg

  ColTree

  = 1.
  The column tree is displayed in row part of Type = "Tree". By default there is one such part with id="Tree" placed on top of the grid.
  The expand / collapse button can be shown also in any cell in LeftIcons / RightIcons / TextIcons by adding CollapseCol button.
  
• Column can hide its children if it has set

  Collapsed

  = 0.
  To restrict collapsing or expanding column children set

  NoCollapse

  = 1.
• To display Level buttons to expand particular tree level set column attribute

  LevelsPart

  to the column part ids to control.
• To collapse / expand the columns on start or on grouping set part attribute

  CollapseLevel

  to the level of expanding. It is also shown in the LevelsPart button.
• The expand button can show plus or it can show the count of collapsed children according to various conditions set by Cfg

  ExpandDigits

  .
• The column tree can be shown also in reversed order, the children shown above parents, if set Cfg

  ReversedTree

  & 2.
• The height of the tree level in the Tree part (how much the next level is indendented in pixels) is set by Cfg

  ColTreeHeight

  .
• It is possible to hide lines in the tree and show only expand / collapse buttons by Cfg

  ColTreeLines

  .
• Horizontal position of the expand button in the Tree part is set by Cfg

  ColTreePaddingLeft

  , and position of the line ends by Cfg

  ColTreePaddingRight

  .
• It is possible to also show / hide particular row(s) when showing / hiding particular column level, define these rows per column level in Cfg

  ColLevelsRows

  .