The Spark DataGrid control
is a skinnable component that uses a Grid control
as a skin part. The Grid control displays a list of data items in
a two-dimensional grid of cells. Each object in the data provider
of the Grid control defines a single row. Individual properties
of each object define each cell of the row.
A GridColumn object
represents each column of the Grid control. The GridColumn object
is responsible for displaying a cell value for each row of the grid.
To display a cell, the GridColumn object specifies an item renderer.
To edit a cell, the GridColumn object specifies an item editor.
The Grid control only creates as many item renderers as are required
to display the currently visible cells. For example, you define
a Grid control with hundreds or thousands of rows. Flex only creates
enough item renderers to display the currently visible cells, but
not for the cells that are currently off the screen.
When a cell is moved off the visible area of the screen, its
item renderer is recycled. That means the item renderer can be reused
when a new cell moves onto the visible area of the screen. Recycling
item renderers greatly reduces the overhead required to use the
The following list describes some other differences between the
DataGrid and Grid controls:
Unlike the DataGrid control, the Grid control is not
By default, the Grid control does not display scroll bars.
To add scroll bars, wrap the Grid control in the Scroller component.
The Grid control does not provide default mouse or keyboard
event handling. You must add support for those events yourself.