[Overview][Constants][Types][Classes][Procedures and functions][Index] Reference for unit 'DBCtrls' (#lcl)

TDBGroupBox

[Properties (by Name)] [Methods (by Name)] [Events (by Name)]

TDBGroupBox - a data-aware version of TGroupBox, allowing a number of data-aware objects to be grouped together on a form.

Declaration

Source position: dbctrls.pp line 1080

type TDBGroupBox = class(TCustomGroupBox)

protected

  procedure DataChange();

  

Updates the value for the control when the linked dataset is changed.

  procedure Notification(); override;

  

Handles a notification when a component is added to or removed from the control.

public

  constructor Create(); override;

  

Constructor for the class instance.

  destructor Destroy; override;

  

Destructor for the class instance.

  function ExecuteAction(); override;

  

Provides support for TBasicAction in the control.

  function UpdateAction(); override;

  

Updates the specified action to reflect the current state in the linked dataset.

  property Field: TField; [r]

  

The Field to which the datalink is attached.

published

  property Align: TAlign;

  

Specifies the placement of the control inside its Parent.

  property Anchors: TAnchors;

  

The set of anchor definitions for this control.

  property BiDiMode: TBiDiMode;

  

Customization (of text controls) in bidirectional reading environments.

  property BorderSpacing: TControlBorderSpacing;

  

Determines the inner and outer border spacing for this control.

  property Caption: TCaption;

  

Text displayed as the caption for the control.

  property ClientHeight: Integer;

  

The height of the client area of the control.

  property ClientWidth: Integer;

  

The width of the client area of the control.

  property Color: TColor;

  

The background color of the control.

  property Constraints: TSizeConstraints;

  

The minimum and maximum Width and Height for the control.

  property Cursor: TCursor;

  

The shape of the mouse pointer, when the mouse is over this control.

  property DataField: string; [rw]

  

Contains the name of the field with the value for the control.

  property DataSource: TDataSource; [rw]

  

Provides access to the dataset with content for the control.

  property DoubleBuffered: Boolean;

  

Allows to reduce flicker in the painting of the control.

  property DragCursor: TCursor;

  

The cursor shape shown while the control is dragged.

  property DragKind: TDragKind;

  

The operation when the control is dragged - Drag or Dock.

  property DragMode: TDragMode;

  

Allows the user to drag the control.

  property Enabled: Boolean;

  

Determines whether the control reacts on mouse or keyboard input.

  property Font: TFont;

  

The font to be used for text display in this control.

  property OnClick: TNotifyEvent;

  

Notification handler for mouse clicks.

  property OnContextPopup: TContextPopupEvent;

  

Invoked when a context-sensitive pop-up menu is requested.

  property OnDblClick: TNotifyEvent;

  

Event Handler for double mouse clicks.

  property OnDragDrop: TDragDropEvent;

  

This handler determines the action on an drop onto this control, in a drag-drop operation.

  property OnDragOver: TDragOverEvent;

  

Event handler for a control being dragged over this control.

  property OnEndDrag: TEndDragEvent;

  

Notification handler for the end of a dragging operation.

  property OnEnter: TNotifyEvent;

  

Handler for control receiving the focus.

  property OnExit: TNotifyEvent;

  

Handler for control loosing the focus; This is a good place for checking the finished user input.

  property OnKeyDown: TKeyEvent;

  

Event handler signalled when a key is down while the control has focus.

  property OnKeyPress: TKeyPressEvent;

  

Event handler signalled when a key is being pressed while the control has focus.

  property OnKeyUp: TKeyEvent;

  

Event handler signalled when a key is up (not pressed) while the control has focus.

  property OnMouseDown: TMouseEvent;

  

Event handler for mouse button going down.

  property OnMouseEnter: TNotifyEvent;

  

Event handler for mouse entering the area of the control.

  property OnMouseLeave: TNotifyEvent;

  

Event handler for mouse leaving the area of the control.

  property OnMouseMove: TMouseMoveEvent;

  

Event handler for mouse movement within the control.

  property OnMouseUp: TMouseEvent;

  

Event handler for mouse button going up.

  property OnMouseWheel: TMouseWheelEvent;

  

Event handler for mouse wheel turned.

  property OnMouseWheelDown: TMouseWheelUpDownEvent;

  

Event handler for downward movement of mouse wheel.

  property OnMouseWheelUp: TMouseWheelUpDownEvent;

  

Event handler for upward movement of the mouse wheel.

  property OnResize: TNotifyEvent;

  

Notification handler for a resize of the control.

  property OnStartDrag: TStartDragEvent;

  

Event handler for the start of a dragging operation.

  property OnUTF8KeyPress: TUTF8KeyPressEvent;

  

Handler for a character entered by the user.

  property ParentBiDiMode: Boolean;

  

Allows to use the BiDiMode settings in the Parent control. Default is true.

  property ParentColor: Boolean;

  

Use the Color from the Parent control, when enabled.

  property ParentDoubleBuffered: Boolean;

  

Value from the DoubleBuffered property in a Parent control.

  property ParentFont: Boolean;

  

If true, the Font of the control will be the same as the one from the Parent. Default is true.

  property ParentShowHint: Boolean;

  

If true, the value of ShowHint for the control will be the same as the one from the Parent. Default is true.

  property PopupMenu: TPopupMenu;

  

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

  property ShowHint: Boolean;

  

Enables the Hint display.

  property TabOrder: TTabOrder;

  

Determines the sequence of control navigation when the user presses the Tab key.

  property TabStop: Boolean;

  

Allows the user to navigate to this control, by pressing the Tab key.

  property Visible: Boolean;

  

Indicates if the control is visible on its parent.

end;

Inheritance

TDBGroupBox

  

TDBGroupBox - a data-aware version of TGroupBox, allowing a number of data-aware objects to be grouped together on a form.

|

TCustomGroupBox

  

The base class for TGroupBox, TRadioGroup and TCheckGroup.

|

TWinControl

  

The base class for controls which can contain other (child) controls.

|

TControl

  

The base class for visible controls.

|

TLCLComponent

  

The base class for LCL components which have an associated widget.

|

TComponent

?

TObject

Description

TDBGroupBox is a TCustomGroupBox descendant which implements a data-aware container for visual controls. A typical use case would involve using a database table where records contain one field which defines the group box caption, while other fields provide the values for additional data-aware controls.

Like other data-aware controls, TDBGroupBox contains both a DataSource and a DataField property which provides access to the linked dataset and the field with the caption for the control.

See also

TCustomGroupBox

  

The base class for TGroupBox, TRadioGroup and TCheckGroup.

How To Use Data-aware Controls

  

HowToUseDataAwareControls - Hints for accessing databases.

The latest version of this document can be found at lazarus-ccr.sourceforge.net.