©2005 Felleisen, Proulx, et. al.

4.4  Problem

A GUI Component is one of the following:

• Checkbox

• Textfield

• OptionsView

• ColorView

• Table

The first four components are primitive components, while the Table is a compound component. Each component contains a label and some additional data.

• The data for a Table is a list of Rows. A Row is a list of Components.

• Data for each of the primitive components consists of the default value to be displayed, specified as a String, and also the preferred width and height for this component.

1. Draw the class diagram for this collection of classes.

2. Design the methods needed to count the number of primitive GUI components in a given GUI Component.

3. Design the methods needed to determine the height of a given GUI Component. The height of a table is the sum of the heights of the Rows. The height of a Row is the maximum of its components' heights.