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;
ARGUMENTS
child Specifies the child.
children Specifies a list of child widgets.
num_children
Specifies the number of children.
DESCRIPTION
The XtManageChildren function performs the following:
⊕ 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
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.
⊕ If the parent is realized and after all children
have been marked, it makes some of the newly
managed children viewable:
- Calls the change_managed routine of the
widgets' parent.
- Calls XtRealizeWidget on each previously
unmanaged child that is unrealized.
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XtManageChildren(3Xt) XtManageChildren(3Xt)
- Maps each previously unmanaged child that has
map_when_managed True.
Managing children is independent of the ordering of
children 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
procedure 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 realized.
The XtManageChild function constructs a WidgetList of
length one and calls XtManageChildren.
The XtUnmanageChildren function performs the following:
⊕ 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
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.
⊕ Calls the change_managed routine 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 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)
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XtManageChildren(3Xt) XtManageChildren(3Xt)
X Toolkit Intrinsics Programming Manual
Xlib Programming Manual
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