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NAME

       XmTree - The Tree widget class

SYNOPSIS

       #include <Xm/XTree.h>

DESCRIPTION

       The  Tree widget is a container that shows the relationship of its children in a graphical
       tree-like format. Each child of the Tree widget is a node in the  Tree.  The  parent-child
       relationships  between these nodes are completely distinct from the widget hierarch..  The
       hierarchy of nodes is created by specifying the tree "parent" of each node as a constraint
       resource. If a node's parent is NULL then it is assumed to be a root of the tree. Although
       each widget can only have one parent, the Tree widget supports adding more than one "root"
       node to a single Tree.

       Note:  the  Tree  widget  assumes  that  is  will  be  totally responsible for mapping and
       unmapping its children.  Therefore  no  child  of  this  widget  should  ever  modify  its
       mappedWhenManaged  resource.  If  a  child  does  modify  this  resource  the  behavior is
       undefined.

User Interaction

       Each node in the tree can be in four states: open, closed, always open,  and  hidden.  The
       state  of  a node changes how it appears to the user and what actions are available to the
       user.

       Open           This node will have an open folder shown to its left that may  be  selected
                      by  the  user  to  close this node. When a node is open all of its children
                      will be visible to the user.

       Closed         This node will have a closed folder shown to its left that may be  selected
                      by  the  user to open this node. When a node is closed none of its children
                      will be visible to the user.

       Always Open    This node will have no folder  button  associated  with  it.   All  of  its
                      children will be visible to the user.

       Hidden         This node will not be shown to the user and all of its children will appear
                      and act exactly as if they were children of this  node's  parent.  It  will
                      appear to the user as if this node does not exist.

       To maintain consistency of the user interface we have found that it is bestto use the node
       state "Always Open" for nodes with no children. This way the user will only see  a  folder
       button next to a node that has children to display. A folder button associated with a node
       that has no children has no defined semantics.

Normal Resources

       Name                  Class          Type                  Initial Value
       connectStyle          ConnectStyle   unsigned char         XmTreeDirect
       horizontalNodeSpace   Dimension      HorizontalDimension   20
       verticalNodeSpace     Dimension      VerticalDimension     2

       All resource names begin with XmN and all resource class names begin with XmC.

connectStyle

       The style of the lines visually connecting parent  nodes  to  children  nodes.  The  valid
       styles are XmTreeDirect or XmTreeLadder.

horizontalNodeSpace

verticalNodeSpace

       The amount of space between each node in the tree and it nearest neighbor.

       The following resources are inherited from the XmHierarchy widget:

       Name                Class       Type                  Initial Value
       autoClose           AutoClose   Boolean               True
       closeFolderPixmap   Pixmap      Pixmap                XmUNSPECIFIED_PIXMAP
       horizontalMargin    Dimension   HorizontalDimension   2
       openFolderPixmap    Pixmap      Pixmap                XmUNSPECIFIED_PIXMAP
       refigureMode        Boolean     Boolean               True
       verticalMargin      Dimension   VerticalDimension     2

       All resource names begin with XmN and all resource class names begin with XmC.

Constraint Resources

       Name               Class              Type        Initial Value
       openClosePadding   OpenClosePadding   Int         0
       lineColor          Foreground         Pixel       <dynamic>
       lineWidth          LineWidth          Dimension   0

       All  resource  names  begin  with  XmN  and  all  resource  class  names  begin  with XmC.
       openClosePadding

       The number of pixels between the folder button and the node it is associated with.

lineColor

       The color of the line connecting a node to its parent. The default value for this resource
       is the foreground color of the Tree widget.

lineWidth

       The width of a connection line between a node and its parent

       The following constraint resources are inherited from the XmHierarchy widget:

       Name           Class          Type                   Initial Value
       insertBefore   InsertBefore   Widget                 NULL
       nodeState      NodeState      XmHierarchyNodeState   Open
       parentNode     ParentNode     Widget                 NULL

       All  resource  names begin with XmN and all resource class names begin with XmC.  Geometry
       Management:

       The layout is performed by assigning each node a box that is just  large  enough  to  con-
       tain  itself  and  all  of its children. A recursive layout is then performed that centers
       each node vertically in its box and at the extreme left horizontally. The children's boxes
       are  then  placed to the right of the node separated by the horizontalNodeSpace from their
       parent, stacked above each other and  separated  by  verticalNodeSpace.  This  process  is
       repeated recursively for each child in the tree.

       The  preferred  size  of the entire tree will be just large enough to contain all nodes in
       the hierarchy. As the state of nodes change the tree will attempt to resize itself to con-
       tain  its  current  configuration.  If the tree is forced larger than the desired size the
       nodes will be centered vertically and flush to the left edge of the tree  widget.  If  the
       tree  is forced smaller, some nodes may be moved or drawn outside the end of the tree. For
       this reason it is usually desirable to put the tree into a Scrolled Window widget.

SEE ALSO

       XmColumn(3X)

COPYRIGHT

       Copyright (c) 1992 by Integrated Computer Solutions, Inc.

                                           15 July 1992                                 XmForm(3)