TDBCheckBox

type TDBCheckBox = class(TCustomCheckBox)

protected

  function GetFieldCheckState; virtual;

GetFieldCheckState - returns the checkbox state for the current field

  procedure DataChange(); virtual;

DataChange - uses GetFieldCheckState to update the State

  procedure UpdateData(); virtual;

UpdateData - examines the State to see whether it has changed

  procedure FocusRequest(); virtual;

FocusRequest - a request has been received, so Sets Focus

  procedure Notification(); override;

  procedure Loaded; override;

public

  constructor Create(); override;

Create - constructor for TDBCheckBox: calls inherited Create, forms logical connections for checked and unchecked, sets initial style and state, forms datalinks and actions

  destructor Destroy; override;

Destroy - destructor for TDBCheckBox: frees links and calls inherited Destroy

  procedure EditingDone; override;

EditingDone - if the datalink is in an Editing state, updates the data through the link then calls inherited EditingDone

  property Checked;

Checked - whether this button has been checked, which signifies selection

  property Field: TField; [r]

The Field in the DataSet with which the box is to be associated

  property State;

Indicates whether the check box is checked (selected), unchecked (deselected) or grayed.

published

  property AllowGrayed;

Determines whether the check box can be in a "grayed" state.

  property Align;

  property Anchors;

The set of anchor definitions for this control

  property AutoSize;

Whether auto-size is to be used

  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 Color;

Determine the colour for the current control

  property DataField: String; [rw]

The name (as a string) of the field with which the checkbox is to be associated

  property DataSource: TDataSource; [rw]

The DataSource containing the Field that is to be associated with this checkbox

  property DragCursor;

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

  property DragKind;

DragKind - what sort of dragging? Drag or Dock

  property DragMode;

DragMode - whether manual or automatic

  property Enabled;

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

  property Font;

  property Hint;

Hint - a small informative pop-up box that appears when the mouse 'hovers' over a control

  property OnChange;

OnChange - event handler for any change in properties 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 OnEnter;

OnEnter - event handler for when the mouse enters the control, and the control receives focus

  property OnExit;

OnExit - event handler for when the mouse leaves the control and it loses focus

  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 OnStartDrag;

Event handler for start of dragging operation

  property ParentColor;

ParentColor - should the control have the same colour as the parent? Default is true

  property ParentFont;

ParentFont - should the control use the same font as the parent? Default is true

  property ParentShowHint;

ParentShowHint - does the control adopt the same hinting behaviour as its parent? Default is true

  property PopupMenu;

PopupMenu - a context-sensitive menu that pops up when the right mouse button is clicked over this control

  property ReadOnly: Boolean; [rw]

ReadOnly - if True, data may be read but not written or modified (doesn't make much sense for a check-box unless the box is NOT Enabled!)

  property ShowHint;

Flag to determine: Is hint to be displayed for this control?

  property TabOrder;

The place this control occupies in the list of tabs

  property TabStop;

Is the control in the sequence of controls accessed by successive presses of the Tab key?

  property ValueChecked: String; [rw]

ValueChecked - the box for the value has been checked

  property ValueUnchecked: String; [rw]

ValueUnchecked -the box for the value is unchecked

  property Visible;

Visible - can the control be seen?

end;

TDBCheckBox

TDBCheckBox - a data-aware checkbox for use with logical fields in a database

TCustomCheckBox

TCustomCheckBox is the ancestor of all check-box components.

TButtonControl

TButtonControl : ancestor class for several Button (including Radio Button) and Check Box classes

TWinControl

TControl

TLCLComponent

TLCLComponent - base class for LCL components

TComponent,IUnknown,IInterfaceComponentReference

TPersistent

TObject

HowToUseDataAwareControls

HowToUseDataAwareControls - Hints for accessing databases