XtManageChildren(3Xt)                       XtManageChildren(3Xt)



NAME
     XtManageChildren, XtManageChild, XtUnmanageChildren,
     XtUnmanageChild - manage and unmanage children

SYNOPSIS
     typedef Widget *WidgetList;

     void XtManageChildren(children, num-children)
     WidgetList children;
     Cardinal num-children;

     void XtManageChild(child)
     Widget child;

     void XtUnmanageChildren(children, num-children)
     WidgetList children;
     Cardinal num-children;

     void XtUnmanageChild(child)
     Widget child;

DESCRIPTION
     The XtManageChildren function performs these operations:

          Issues an error if the children do not all have the
          same parent or if the parent is not a subclass of
          compositeWidgetClass.

          Returns immediately if the common parent is being des-
          troyed; otherwise, for each unique child on the list,
          XtManageChildren ignores the child if it already is
          managed or is being destroyed and marks it if not.

          If the parent is realized and after all children have
          been marked, it makes some of the newly managed chil-
          dren viewable:

               Calls the change_managed procedure of the widgets'
               parent.

               Calls XtRealizeWidget on each previously unmanaged
               child that is unrealized.

               Maps each previously unmanaged child for which
               map_when_managed TRUE.

     Managing children is independent of the ordering of children
     and independent of creating and deleting children.  The lay-
     out procedure of the parent should consider children whose
     managed member is TRUE and should ignore all other children.
     Note that some composite widgets, especially fixed boxes,
     call XtManageChild from their insert_child procedure.



November, 1990                                                  1

XtManageChildren(3Xt)                       XtManageChildren(3Xt)



     If the parent widget is realized, its change_managed pro-
     cedure is called to notify it that its set of managed chil-
     dren has changed.  The parent can reposition and resize any
     of its children.  It moves each child as needed by calling
     XtMoveWidget, which first updates the x and y members and
     then calls
     XMoveWindow if the widget is realized.

     The XtManageChild function constructs a WidgetList of length
     one and calls XtManageChildren.

     The XtUnmanageChildren function performs these operations:

          Issues an error if the children do not all have the
          same parent or if the parent is not a subclass of
          compositeWidgetClass.

          Returns immediately if the common parent is being des-
          troyed; otherwise, for each unique child on the list,
          XtUnmanageChildren performs these operations:

               Ignores the child if it already is unmanaged or is
               being destroyed and marks it if not.

               If the child is realized, it makes it nonvisible
               by unmapping it.

          Calls the change_managed procedure of the widgets'
          parent after all children have been marked if the
          parent is realized.

     XtUnmanageChildren does not destroy the children widgets.
     Removing widgets from a parent's managed set is often a tem-
     porary banishment, and, some time later, you may manage the
     children again.

     The XtUnmanageChild function constructs a widget list of
     length one and calls XtUnmanageChildren.

   Arguments
     These functions accept the following arguments:

     child   Specifies the child.

     children
             Specifies a list of child widgets.

     num-children
             Specifies the number of children.






2                                                  November, 1990

XtManageChildren(3Xt)                       XtManageChildren(3Xt)



SEE ALSO
     XtMapWidget(3Xt), XtRealizeWidget(3Xt)

     X Toolkit Intrinsics - C Language Interface

     Xlib - C Language Interface


















































November, 1990                                                  3