XtManageChildren(3Xt) XT FUNCTIONS XtManageChildren(3Xt)
NAME
XtManageChildren, XtManageChild, XtUnmanageChildren, XtUn-
manageChild - manage and unmanage children
SYNTAX
typedef Widget *WidgetList;
void XtManageChildren(children, numchildren)
WidgetList children;
Cardinal numchildren;
void XtManageChild(child)
Widget child;
void XtUnmanageChildren(children, numchildren)
WidgetList children;
Cardinal numchildren;
void XtUnmanageChild(child)
Widget child;
ARGUMENTS
child Specifies the child.
children Specifies a list of child widgets.
numchildren
Specifies the number of children.
DESCRIPTION
The XtManageChildren function performs the following:
o Issues an error if the children do not all have the
same parent or if the parent is not a subclass of
compositeWidgetClass.
o Returns immediately if the common parent is being
destroyed; 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.
o 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 routine of the widgets'
parent.
- Calls XtRealizeWidget on each previously unman-
aged child that is unrealized.
- Maps each previously unmanaged child that has
map_when_managed True.
X Version 11 Release 3 1
XtManageChildren(3Xt) XT FUNCTIONS XtManageChildren(3Xt)
Managing children is independent of the ordering of chil-
dren and independent of creating and deleting children.
The layout routine of the parent should consider children
whose managed field is True and should ignore all other
children. Note that some composite widgets, especially
fixed boxes, call XtManageChild from their insert_child
procedure.
If the parent widget is realized, its change_managed pro-
cedure is called to notify it that its set of managed
children 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
fields and then calls XMoveWindow if the widget is real-
ized.
The XtManageChild function constructs a WidgetList of
length one and calls XtManageChildren.
The XtUnmanageChildren function performs the following:
o Issues an error if the children do not all have the
same parent or if the parent is not a subclass of
compositeWidgetClass.
o Returns immediately if the common parent is being
destroyed; otherwise, for each unique child on the
list, XtUnmanageChildren performs the following:
- 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.
o Calls the change_managed routine of the widgets' par-
ent 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
temporary banishment, and, some time later, you may manage
the children again.
The XtUnmanageChild function constructs a widget list of
length one and calls XtUnmanageChildren.
SEE ALSO
XtMapWidget(3Xt), XtRealizeWidget(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
X Version 11 Release 3 2