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The
List, DataGrid, and TileList components all inherit from the SelectableList base
class. For this reason, these components are considered List-based
components. A ComboBox consists of a text box and a List so it,
too, is a List-based component.
A List is composed of rows.
A DataGrid and a TileList are composed of rows that can be divided
into multiple columns. The intersection of a row and a column is a
cell. In a List, which is a single column of rows, each row is a
cell. A cell has the following two important aspects:
-
The
data values that cells hold are called items. An
item
is
an ActionScript object used for storing the units of information
in a List. A List can be thought of as an array with each indexed
space of the array being an item. In a List, an item is an object
that typically has a
label
property that is displayed
and a
data
property that is used for storing data.
A
data provider
is a data model of the items in a List. A
data provider allows you to populate a List-based component simply
by assigning it to the component’s
dataProvider
property.
-
A
cell can hold different types of data that range from text to images, MovieClips,
or any class that you can create. For this reason, a cell must be drawn
or rendered in a way that is appropriate for its content. Consequently, List-based
components have a
cell renderer
to render its cells. In the
case of the DataGrid, each column is a DataGridColumn object, which
also has a
cellRenderer
property, so that each
column can be rendered appropriately for its content.
All
List-based components have
cellRenderer
and
dataProvider
properties
that you can set to load and render the cells of these components. For
information on using these properties and working with List-based components,
see
Work with a DataProvider
and
Work with a CellRenderer
.
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