TComponentDataLink class

In unit DBGrids

Maintains an association between a component and a dataset.

Declaration

pascal

TComponentDataLink = class(TDatalink)

Inheritance

TComponentDataLink
TDatalink
TPersistent
TObject

Description

TComponentDataLink is a TDatalink descendant that maintains an association between a component and its linked dataset. TComponentDataLink coordinates the actions of the component and the dataset, and allows the component to respond to data events. TComponentDataLink defines event handlers which can be used to forward dataset events to the component implementation.

TComponentDataLink is the type used to implement the TCustomDBGrid.DataLink property.

Properties

`Modified`	protected	Indicates if the component or the linked dataset has been changed.
`DataSetName`	public	Contains the name for the linked dataset.
`Fields`	public	Provides indexed access to fields in the linked dataset by their ordinal position.
`VisualControl`	public

Methods

`RecordChanged`	protected	Signals the OnRecordChanged event handler when assigned.
`DataSetChanged`	protected	Signals the OnDatasetChanged event handler when assigned.
`ActiveChanged`	protected	Signals an event handler when the Active property is changed.
`LayoutChanged`	protected	Signals the OnLayoutChanged event handler when assigned.
`DataSetScrolled`	protected	Signals the OnDataSetScrolled event handler when assigned.
`FocusControl`	protected	Signals the OnFocusControl event handler when assigned.
`CheckBrowseMode`	protected	Calls the inherited method.
`EditingChanged`	protected	Signals the OnEditingChanged event handler when assigned.
`UpdateData`	protected	Signals the OnUpdateData event handler when assigned.
`MoveBy`	protected	Moves the position in the dataset by the specified number of rows.

Events

`OnRecordChanged`	public	OnRecordChanged - event handler for a change in the current record.
`OnDataSetChanged`	public	OnDataseChanged - event handler for a change in the attached dataset.
`OnNewDataSet`	public	OnNewdataset - event handler for formation of a link to a new dataset.
`OnDataSetOpen`	public	OnDataseOpen - event handler when the dataset is open.
`OnInvalidDataSet`	public	OnInvalidDataset - event handler when the dataset is invalid.
`OnInvalidDataSource`	public	OnInvalidDataSource - event handler when the data source is invalid.
`OnFocusControl`	public	Event handler signalled when the grid control receives focus.
`OnLayoutChanged`	public	OnLayoutChanged - event handler when the layout of the dataset has changed.
`OnDataSetClose`	public	OnDataseClose - event handler when the dataset is closed.
`OnDataSetScrolled`	public	OnDataseScrolled - event handler when the dataset is scrolled.
`OnEditingChanged`	public	Event handler signalled when the value for the Editing property has been changed.
`OnUpdateData`	public	Event handler signalled to perform actions for pending changes to the linked dataset.

Inherited

From TDatalink (26)

Active ActiveRecord BOF BufferCount Create DataEvent DataSet DataSource DataSourceFixed Destroy Edit Editing Eof ExecuteAction FirstRecord GetActiveRecord GetBOF GetBufferCount GetEOF GetRecordCount ReadOnly RecordCount SetActiveRecord SetBufferCount UpdateAction UpdateRecord

From TPersistent (8)

Assign AssignTo DefineProperties FPOAttachObserver FPODetachObserver FPONotifyObservers GetNamePath GetOwner

From TObject (40)

AfterConstruction BeforeDestruction CheckDisposed ClassInfo ClassName ClassNameIs ClassParent ClassType CleanupInstance DefaultHandler DefaultHandlerStr Dispatch DispatchStr Disposed DisposeOf Equals FieldAddress Free FreeInstance GetDisposed GetHashCode GetInterface GetInterfaceByStr GetInterfaceEntry GetInterfaceEntryByStr GetInterfaceTable GetInterfaceWeak GetLastCastErrorInfo InheritsFrom InitInstance InstanceSize MethodAddress MethodName newinstance QualifiedClassName SafeCallException StringMessageTable SystemHasExtendedRTTI ToString UnitName

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