Graphical Modeling Framework Tooling - Eclipse Modeling Project: A Domain-Specific Language Toolkit - page 511

Layout

Each figure also has layout properties for its Layout and Layout Data . A num-
ber of Layout classes are available, with corresponding Layout Data where
appropriate. As usual, a Custom Layout element is available for those who
want to specify a custom class name.

Flow Layout
Flow Layout corresponds to GEF's org.eclipse.draw2d.FlowLayout class
and is used to arrange children of a figure in rows or columns. A number of
options are available for Flow Layout, as presented in Table 11-3.

Table 11-3 Flow Layout Properties

Property Description Default

Vertical (Orientation) A Boolean property that determines whether the False

components should be laid out vertically
(true) or horizontally (false).

Force Single Line Causes the generation of a ToolbarLayout, False

which allows elements to be compressed
(resized) so that they fit into a single
row/column.

Match Minor Size In a horizontal layout, figures will have False

the same height. In a vertical layout,
figures will have the same width.

Major Alignment The alignment used for a row/column. BEGINNING

[BEGINNING | CENTER | END | FILL]

Major Spacing The spacing in pixels between elements 5

running parallel to the layout orientation.

Minor Alignment The alignment used for elements within BEGINNING

a row/column. [BEGINNING | CENTER
| END | FILL]

Minor Spacing The spacing in pixels between elements 5

within a row or column.

For example, Figure 11-3 shows what the default Flow Layout settings pro-
duce using a simple Rectangle that can accept children Rectangle s. When the
Vertical property is set to true , the children are added vertically, not hori-
zontally, as shown.