DBGrids unit

Implements a data-aware grid to display and operate on information in a database.

dbgrids.pas contains classes and types needed to implement a database-aware grid control. The following components are added to the Data Controls tab in the Lazarus IDE Component Palette:

TDBGrid

The unit also includes the TComponentDatalink component, which is used as the data link for TCustomDBGrid. It was taken from an article by Joanna Carter: "The Ultimate Datalink?" , published in Delphi Magazine Issue #30 February 1998.

Classes and records

`EInvalidGridOperation`	class	Exception raised for an invalid grid operation.
`TBookmarkedRecordEnumerator`	class	Defines a bookmarked record enumeration class.
`TBookmarkList`	class	Implements a list of Bookmarks in a database grid.
`TColumn`	class	Implements a display column for the TDBGrid control.
`TColumnTitle`	class	TColumnTitle is a TGridColumnTitle descendant.
`TComponentDataLink`	class	Maintains an association between a component and a dataset.
`TCustomDBGrid`	class	TCustomDBGrid is the base class for TDBGrid.
`TDBGrid`	class	Data-aware grid control used to display and edit rows and columns in a dataset.
`TDBGridColumns`	class	Implements a collection for columns in a database-aware grid.

Procedures and functions

Register procedure Registers components in the unit for use in the Lazarus IDE.

Types

`TBookmarkedRecordEnumeratorOptions`	set	Enumeration with option values for the bookmarked record enumerator.
`TColumnOrder`	enumeration	Enumerated type defining alternate ordering for columns.
`TDataSetScrolledEvent`	procedure type	Specifies an event handler signalled after scrolling a dataset.
`TDbGridCellHintEvent`	procedure type	Specifies an event handler signalled to get the hint text for a cell in a grid control.
`TDbGridCheckBoxBitmapEvent`	procedure type	Specifies an event handler signalled to get the user-specified Bitmap for a check box column in a grid control.
`TDbGridCheckboxStateEvent`	procedure type	Specifies an event handler signalled to get the user-specified state for a check box column on the grid control.
`TDBGridClickEvent`	procedure type	Specifies an event handler signalled when a grid column in is clicked.
`TDbGridExtraOption`	enumeration	Enumerated type that specifies extra options available in a database grid.
`TDbGridExtraOptions`	set	TDbGridExtraOptions is a set of values from the TDbGridExtraOption enumeration.
`TDBGridOption`	enumeration	Enumerated type containing options available for use in a database grid control.
`TDbGridOptions`	set	Stores values from the TDbGridOption enumeration.
`TDbGridSelEditorEvent`	procedure type	Specifies an event handler used to select a cell editor in a database grid.
`TDbGridStatus`	set	Set type used to store TDbGridStatusItem enumeration values.
`TDbGridStatusItem`	enumeration	Enumerated type with values for status messages used in a database grid.
`TDrawColumnCellEvent`	procedure type	Specifies an event handler for drawing a cell in a grid control.
`TFocusControlEvent`	procedure type	Event handler signalled to coordinate Field selection and control focus.
`TGetDbEditMaskEvent`	procedure type	Specifies an event handler used to get the Edit Mask for a cell in a grid.
`TMovedEvent`	procedure type	Specifies an event handler signalled when the display order of rows or columns is changed.
`TPrepareDbGridCanvasEvent`	procedure type	Specifies an event handler which prepares the canvas for drawing a database grid.

Constants

DEFINDICATORCOLWIDTH constant Default width for the row indicator column in a grid control.

Uses

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.