TColumn class

In unit DBGrids

Implements a display column for the TDBGrid control.

Declaration

pascal

TColumn = class(TGridColumn)

Inheritance

Description

TColumn is a TGridColumn descendant that represents a display column in a database grid control. TColumn extends the ancestor class to provide support for using TField for data access, display formatting, alignment, as well as use of check box and lookup list Fields. TColumn also implements support for features in TDBGrid like: automatic rows, and design-time vs run-time column ordering.

TColumn provides properties and methods needed to access and maintain the Dataset, Field, FieldName, and DisplayFormat for the column. TColumn provides overridden functions which implement facilities from the ancestor class.

TColumn instances can be created at run-time or design-time; properties are provided to indicate when the instance was created. The display order for columns need not correspond to the order of the Fields in the dataset, nor do all Fields in the dataset need to be represented by a display column.

TColumn instances are used as the collection item for the TDBGridColumns collection.

Properties

`IsAutomaticColumn`	protected	Indicates if the column was automatically added at run-time.
`IsDesignColumn`	protected	Indicates if the column was added at design-time.
`DesignIndex`	public	Order for the column in its collection at design-time.
`Field`	public	Field in the Dataset associated with this Column.
`FieldName`	published	Name of the Field with data for the column.
`DisplayFormat`	published	The format to be used for display in this column.

Methods

`CreateTitle`	protected	Creates the title used for the grid column.
`GetDefaultAlignment`	protected	Gets the default alignment for the Field in the column definition.
`GetDefaultDisplayFormat`	protected	Gets the default display format for the Field in a column.
`GetDefaultValueChecked`	protected	Gets the default value for a check box in the Checked state as a String.
`GetDefaultValueUnchecked`	protected	Gets the default String value for a check box in the UnChecked state.
`GetDefaultVisible`	protected	Indicates if the Field for the column is Visible.
`GetDisplayName`	protected	Gets the display name for the collection item.
`GetDefaultReadOnly`	protected	Gets the default value for the ReadOnly property.
`GetDefaultWidth`	protected	Gets the effective width for the column.
`GetPickList`	protected	Gets the values in the pick list for the column.
`LinkField`	protected	Establishes a link between the FieldName and the Field in a Dataset.
`Create`	public	Constructor for the TColumn instance.
`Assign`	public	Stores properties from a persistent class in the current class instance.
`IsDefault`	public	Indicates if the column uses its default display format.