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Manual Reference Pages  -  XMTLAYOUTBOX (3)

NAME

XmtLayoutBox - the row or column gadget used within the XmtLayout widget.

CONTENTS

SYNOPSIS

Include File: #include <Xmt/LayoutG.h>
Constructor: XmtCreateLayoutBox(), XmtLayoutCol(), XmtLayoutRow()
Class Name: XmtLayoutBox
Class Pointer: xmtLayoutBoxGadgetClass
Class Hierarchy: RectObj -> XmtLayoutGadget -> XmtLayoutBox

DESCRIPTION

The XmtLayoutBox widget is a gadget designed to be used with the XmtLayout widget which organizes other children of the Layout into rows and columns. The Layout widget organizes its children into nested rows and columns; the LayoutBox acts as a ‘‘container’’ to group items in a row or column together. Note that the LayoutBox is not a composite widget like the XmRowColumn widget. Layout items within a row or column are siblings of the LayoutBox, not children of it. The LayoutBox serves as a placeholder for grouping items-children of an Layout widget can be placed within a particular LayoutBox gadget by setting the XmtNlayoutIn constraint resource to point to the LayoutBox. The LayoutBox does not have any visual appearance of its own, but as a child of the Layout widget, it can have a caption or frame automatically provided by the widget. Also, the LayoutBox can specify the way the items it contains will be spaced, and can specify that the items it contains should be made the same width or height.

RESOURCES

XmtLayoutBox inherits the resources of the RectObj and XmtLayoutGadget classes, and defines the following new resources:

NameTypeClassAccessDefault
XmtNbackgroundXtRPixelXtCBackgroundCSGunspecified
XmtNequalXtRBooleanXmtCEqualCSG(XtPointer)False
XmtNitemStretchXtRDimensionXmtCItemStretchCSG1
XmtNorientationXmROrientationXmCOrientationCSGXmHORIZONTAL
XmtNspaceXtRDimensionXmtCSpaceCSG0
XmtNspaceStretchXtRDimensionXmtCSpaceStretchCSG1
XmtNspaceTypeXtRXmtLayoutSpaceTypeXmtCSpaceTypeCSGXmtLayoutSpaceNone
XmtNbackground The color to use for the background of the row or column. If specified, the LayoutBox will fill itself with this color before any captions, frames or other decorations are drawn. If no color is specified, the LayoutBox will take no special action, and will have the same background color as its parent Layout widget.
XmtNequal Whether items in a row should have equal widths or items in a column should have equal heights. If this resource is set to True, and the LayoutBox is configured as a row, then any items in that widget (except for separator or space gadgets) will have their widths adjusted so that they are all as wide as the widest item. Similarly, items in a column will have their heights adjusted so that they are as high as the highest item. If this resource is False (the default), then no special action will be taken to adjust the width or height of items in rows or columns. Setting this resource is often useful for button boxes at the bottom of dialogs in which each button should be as wide as each of the others. Note that this resource adjusts the width of items in a row. The height of items in a row is controlled by the XmtNlayoutJustification constraint resource of each item. By default, items in a row are all have a justification of XmtLayoutFilled, which means that they will all be forced to be as high as the row is, which implies that they will all have the same height.
XmtNitemStretch If XmtNspaceType is not XmtLayoutSpaceNone, this resource, with XmtNspaceStretch specifies the relative stretchiness of the items in this row or column to the spaces automatically inserted between those items. If XmtNitemStretch is 2, for example, and XmtNspaceStretch is 1, then the items of the row will do 2/3rds of the stretching, and the spaces between them will do 1/3 of the stretching. If this resource is zero, then the spaces do all the stretching, and the items stay a fixed width.
XmtNorientation Whether this LayoutBox should be a row or a column. If this resource is XmHORIZONTAL (the default), then the LayoutBox will be a row. If it is XmVERTICAL, then the LayoutBox will be a column.
XmtNspace If XmtNspaceType is not XmtLayoutSpaceNone, this resource specifies the amount of space (in pixels) that will be inserted between items in the Layout Box when computing the natural size of the box.
XmtNspaceStretch If XmtNspaceType is not XmtLayoutSpaceNone, this resource, with XmtNitemStretch specifies the relative stretchiness of the items in this row or column and the spaces that are inserted between those items. If XmtNspaceStretch is 2, for example, and XmtNitemStretch is 1, then the spaces are twice as stretchy as the items and will do 2/3rds of the stretching. If XmtNspaceStretch is 0, and XmtNitemStretch is not zero, then the spaces will remain a fixed size, and the items will do all the stretching.
XmtNspaceType The model the LayoutBox uses to space its children along its major dimension (i.e. horizontally in rows, and vertically in columns.) The default is XmtLayoutSpaceNone which specifies that items are laid out left-to-right or top-to-bottom with no extra space inserted between them. Other legal values are XmtLayoutSpaceEven, XmtLayoutSpaceLREven, XmtLayoutSpaceInterval, and XmtLayoutSpace LCR. See Chapter 19, The Layout Widget: The Details, for an explanation of these spacing models, and of the XmtLayout layout scheme in general.

SEE ALSO

Chapter 19, The Layout Widget: The Details, XmtCreateLayoutBox(), XmtCreateLayoutCol(), XmtCreateLayoutRow(), XmtLayout, XmtLayoutPixmap, XmtLayoutSeparator, XmtLayoutSpace, XmtLayoutString.
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