XmContainerReorder(library call) XmContainerReorder(library call)
NAME
XmContainerReorder -- Container widget function to reorder children
SYNOPSIS
#include <Xm/Container.h>
void XmContainerReorder(
Widget container,
WidgetList widgets,
int num_widgets);
DESCRIPTION
XmContainerReorder obtains the XmNpositionIndex constraint resources of each widget specified in widgets, sorts them in ascending order,
and inserts the XmNpositionIndex constraint resources in the new order into each widget. If the XmNlayoutType resource of Container is
XmOUTLINE or XmDETAIL, XmContainerReorder will force a layout of all items.
container Specifies the Container widget ID.
widgets Specifies an array of widget children of container.
num_widgets
Specifies the number of items in the widgets array.
For a complete definition of Container and its associated resources, see XmContainer(3).
RELATED XmContainer(3).
XmContainerReorder(library call)
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XtManageChildren() XtManageChildren()
Name
XtManageChildren - bring an array of widgets under their parent's geometry management.
Synopsis
void XtManageChildren(children, num_children)
WidgetList children;
Cardinal num_children;
Inputs
children Specifies an array of child widgets. The widgets must all be siblings and must be of class RectObj or any subclass thereof.
num_children
Specifies the number of children in the array.
Description
XtManageChildren() brings a list of widgets created with XtCreateWidget() under the geometry management of their parent. All widgets
(except shell widgets) must be managed in order to be visible. Managing a widget will generally make it visible, unless its
XtNmappedWhenManaged resource is False.
The "Algorithm" section below details the procedure followed by XtManageChildren().
Usage
To manage a single widget, you can use XtManageChild(). To unmanage widgets, use XtUnmanageChild() and XtUnmanageChildren().
If you are going to manage multiple children of the same managed and realized parent, it is more efficient to place those children widget
into an array and call XtManageChildren() just once than it is to manage them individually. The former technique results in only a single
call to the parent's change_managed() method. If you are creating widgets before the widget tree has been realized, however, managing them
one at a time is fine.
Algorithm
XtManageChildren() 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 otherwise.
o If the parent is realized XtManageChildren() does the following:
- Calls the change_managed() method of the widgets' parent.
- Calls XtRealizeWidget() on each marked child that is unrealized.
- Maps each marked child that has its XtNmappedWhenManaged resource True.
The management of children is independent of the creation and ordering of the children. There is no special list of managed children; the
layout routine of the parent should loop through the list of all children and simply ignore those that are not managed (see XtIsManaged()).
Structures
typedef Widget *WidgetList;
See AlsoXtCreateManagedWidget(1), XtIsManaged(1), XtManageChild(1), XtMoveWidget(1), XtRealizeWidget(1), XtSetMappedWhenManaged(1), XtUnman-
ageChild(1), XtUnmanageChildren(1).
Xt - Widget Lifecycle XtManageChildren()
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