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CHAPTER 4: User-Interface Tools Automatic layout 88

et: EditText { characters:4, justify:’right’ } \

}");

w.show();

Each example shows the effects of setting particular layout properties in various ways. In each window, w.

text

is set so that the window title shows which property is being varied, and w.st.text is set to display

the particular property value being demonstrated.

Container orientation

The orientation property of a container specifies the organization of child elements within it. It can have

these values:

X row — Child elements are arranged next to each other, in a single row from left to right across the

container. The height of the container is based on the height of the tallest child element in the row,

and the width of the container is based on the combined widths of all the child elements.

X column — Child elements are arranged above and below each other, in a single column from top to

bottom across the container. The height of the container is based on the combined heights of all the

child elements, and the width of the container is based on the widest child element in the column.

X stack — Child elements are arranged overlapping one another, as in a stack of papers. The elements

overlie one another in the same region of the container. Only the top element is fully visible. The

height of the container is based on the height of the tallest child element in the stack, and the width of

the container is based on the widest child element in the stack.

The following figure shows the results of laying out the sample window with each of these orientations:

Aligning children

The alignment of child elements within a container is controlled by two properties: alignChildren in the

parent container, and

alignment in each child. The alignChildren value in the parent container controls

the alignment of all children within that container, unless it is overridden by the

alignment value set on an

individual child element.

These properties use the same values, which specify alignment along one axis, depending on the

orientation of the container. You can specify an array of two of these strings, to specify alignment along

both axes. The first string specifies the horizontal value, the second specifies the vertical value. The

property values are not case-sensitive; for example, the strings

FILL, Fill, and fill are all valid.

You can also set the value using the corresponding constants from the Alignment

property of the ScriptUI

class; for example:

myGroup.alignment = [ScriptUI.Alignment.LEFT,

ScriptUI.Alignment.TOP]

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