Specifies how the view positions its children. One of: 'absolute', 'vertical', or 'horizontal'.
There are three layout options:
absolute. Default layout. A child view's
properties are interpreted as absolute values in the parent's coordinate space.
If the child includes a `top` value and **not** a `bottom` value, the child is positioned `top` units from the top of the parent's bounding box, and its height is set based on its `height` property. If the child includes a `bottom` value and **not** a `top` value, the child is positioned `bottom` units from the bottom of the parent's bounding box. Its height is set based on its `height` property. If the child includes both `top` and `bottom` values, the behavior is platform-specific. Similar calculations are used for `left` and `right`. You can also position a child by setting its `center` property to a [`Point`](Point-object.html). If no position is set explicitly, children are centered. For example, if a child specifies a `top` of 20 and does not specify any other position properties, the child is positioned 20 units from the parent's top, and centered horizontally.
vertical. Children are laid out vertically from top to bottom. The first child
is laid out
top units from its parent's bounding box. Each subsequent child is
laid out below the previous child. The space between children is equal to the
bottom value plus the lower child's
Each child is positioned horizontally as for the absolute layout mode.
horizontal. Like vertical layout, except children are laid out horizontally
from left to right, using the
right values to determine spacing.
Each child is positioned vertically as in the absolute layout mode.