TDBImage

type TDBImage = class(TCustomImage)

protected

  procedure Notification(); override;

  procedure DataChange(); virtual;

DataChange - if data changed, load new picture

  procedure UpdateData(); virtual;

UpdateData - if data changed, save new picture

  procedure ActiveChange(); virtual;

ActiveChange - if datalink is active, send back new picture

  procedure PictureChanged(); override;

PictureChanged - software emulaton of the OnPictureChanged event

  procedure LoadPicture; virtual;

LoadPicture - loads picture into the appropriate field for the graphic class of the caller

  procedure Loaded; override;

protected

  class procedure WSRegisterClass; override;

public

  constructor Create(); override;

Create - constructor for TDBImage: cals inherited Create then sets style and display methods, forms datalinks and actions

  destructor Destroy; override;

Destroy - destructor for TDBImage: frees datalinks and calls inherited Destroy

  property Field: TField; [r]

The Field in which picture data are stored

  procedure Change; virtual;

Change - if picture is changes, datalink needs to be informed

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 AutoDisplay: Boolean; [rw]

AutoDisplay - if True, automatically displays when focus is given

  property AutoSize;

Whether auto-size is to be used

  property BorderSpacing;

Determines the border spacing for this control

  property Center;

Should image be centered?

  property Constraints;

Determine Constraints (max and min height and width) for this control

  property DataField: String; [rw]

The name of the DataField that holds the image

  property DataSource: TDataSource; [rw]

The identity of the DataSource that holds the image

  property DragCursor;

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

  property DragMode;

DragMode - whether manual or automatic

  property OnClick;

Event Handler for mouse click

  property OnDblClick;

  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 OnStartDrag;

Event handler for start of dragging operation

  property Proportional;

True if image is proportional

  property QuickDraw: Boolean; [rw]

QuickDraw - if True, quick drawing is implemented

  property ReadOnly: Boolean; [rw]

ReadOnly if True, image can be inspected byt not modified or written

  property Stretch;

True if picture is to be stretched

  property Transparent;

True if you can see through the image

  property Visible;

Visible - can the control be seen?

end;

TDBImage

TDBImage - a data-aware Image box to display a single image from a dataset

TCustomImage

TCustomImage - the base type for TImage

TGraphicControl

TGraphicControl is the base class for all lightweight controls.

TControl

TLCLComponent

TLCLComponent - base class for LCL components

TComponent,IUnknown,IInterfaceComponentReference

TPersistent

TObject

HowToUseDataAwareControls

HowToUseDataAwareControls - Hints for accessing databases