TDBRadioGroup

type TDBRadioGroup = class(TCustomRadioGroup)

protected

  procedure Change; virtual;

Change - calls the OnChange event handler if it is assigned

  procedure Notification(); override;

  procedure DataChange();

DataChange - updates the current Value to reflect a change inthe data

  procedure UpdateData();

UpdateData - places the current Value into the data

  property DataLink: TFieldDataLink; [r]

DataLink - the field data link to be used for the data

  function GetButtonValue();

GetButtonValue - returns the string value of the button associated with the specified index

  procedure UpdateRadioButtonStates; override;

UpdateRadioButtonStates - performs the inheited method and ensures that any updates are also reflected via the data link, if it is active and in an Editing state

  procedure Loaded; override;

public

  constructor Create(); override;

Create - constructor for TDBRadioGroup: calls inherited Create then forms datalinks and actions

  destructor Destroy; override;

Destroy - destructor for TDBRadioGroup: frees links and items, then calls inherited Destroy

  procedure EditingDone; override;

EditingDone - updates the record through the datalink, then calls inherited EditingDone

  property Field: TField; [r]

The DataSet Field relevant to the data being selected

  property ItemIndex;

The Index value in the list of Items (a stringlist with the names of the selections for radio buttons)

  property Value: String; [rw]

The selected value (as indicated by ItemIndex)

published

  property Align;

Used to align the control to the top, bottom, left or right of its client.

  property Anchors;

The set of anchor definitions for this control

  property BorderSpacing;

Determines the border spacing for this control

  property Caption;

Caption - the text-string appearing on the Control, usually used to identify its function

  property Columns;

Columns - the number of columns in which the Items (radio buttons) are to be arranges

  property DataField: String; [rw]

The name (as a string) of the Field whose data are linked to the control

  property DataSource: TDataSource; [rw]

The DataSource from which relevant Field data are to be linked - usually the result of a database query

  property DragCursor;

DragCursor - the style of cursor to be used during the Drag process

  property DragMode;

DragMode - whether manual or automatic

  property Enabled;

Whether the control is Enabled (read/write). If not, it usually appears 'greyed-out'

  property Items; [w]

Items - a string list containing the captions for the radio boxes

  property OnChange: TNotifyEvent; [rw]

Event Handler for any change in the radiogroup selection

  property OnChangeBounds;

Event handler for a change in bounds of the control

  property OnClick;

Event Handler for mouse click

  property OnDragDrop;

Event handler for the drop of a control onto this control.

  property OnDragOver;

Event handler for the case when a control is dragged over another control

  property OnEndDrag;

Event handler for the end of a dragging process

  property OnMouseDown;

Event handler for when a mouse button is pressed down

  property OnMouseMove;

Event handler for mouse movement within the current control

  property OnMouseuP;

Event handler for when the mouse button is released, ie "up"

  property OnResize;

Event Handler for resize of control

  property OnStartDrag;

Event handler for start of dragging operation

  property ReadOnly: Boolean; [rw]

ReadOnly - if True, data can only be read, not written or modified. (Doesn't really make sense for a RadioGroup!)

  property TabOrder;

The place this control occupies in the list of tabs

  property TabStop;

  property Values: TStrings; [rw]

The values of the strings in Items

  property Visible;

Visible - can the control be seen?

end;

TDBRadioGroup

TDBRadioGroup - a data-aware version of TRadioGroup, providing a series of mutually exclusive buttons to select an entry to insert into a database field

TCustomRadioGroup

TCustomRadioGroup: the base type for TRadioGroup

TCustomGroupBox

TCustomGroupBox - the base class for TGroupBox, TRadioGroup and TCheckGroup

TWinControl

TControl

TLCLComponent

TLCLComponent - base class for LCL components

TComponent,IUnknown,IInterfaceComponentReference

TPersistent

TObject

HowToUseDataAwareControls

HowToUseDataAwareControls - Hints for accessing databases