TCustomScrollBar

type TCustomScrollBar = class(TWinControl)

  class procedure WSRegisterClass; override;

WSRegisterClass - Register this Class for the current Widget Set

  class function GetControlClassDefaultSize; override;

protected

  procedure CreateParams(); override;

CreateParams - calls inherited CreateParams then sets up style and alignment depending on whether horizontal or vertical

  procedure CreateWnd; override;

CreateWnd - calls inherited CreateWnd then initialises various Scroll Info properties

  procedure Change; virtual;

Change - method to signal that a change has occured

  procedure Scroll(); virtual;

The scrolling process

  procedure CalculatePreferredSize(); override;

public

  constructor Create(); override;

Create - constructor for TCustomScrollBar: calls inherited Create then initialises size, style and various local variables

  procedure SetParams();

Defines the Max and Min values, the size of the page and the position of the scroller

  property Kind: TScrollBarKind; [rw]

Kind of scroll bar - whether Horizontal or Vertical

  property LargeChange: TScrollBarInc; [rw]

LargeChange - the size of the step to be taken by the slider for a large change

  property Max: Integer; [rw]

The maximum value (for bottom of the scroll bar or the right-most extent)

  property Min: Integer; [rw]

The minimum value, for the top of the scroll bar or its left-most extent

  property PageSize: Integer; [rw]

PageSize: the size of a page - typically used for LargeChange

  property Position: Integer; [rw]

The Position of the scroller along the ScrollBar

  property SmallChange: TScrollBarInc; [rw]

SmallChange - the size of the step to be taken by the scroller for a small change

  property TabStop;

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

  property OnChange: TNotifyEvent; [rw]

OnChange - Event handler for any change in position of the slider or other mouse movement or keyboard event associated with the scrollbar

  property OnScroll: TScrollEvent; [rw]

OnScroll - Handler for a scrolling event (by mouse, keyboard or program)

end;

TCustomScrollBar

TCustomScrollBar : the base class for TScrollBar

TWinControl

TControl

TLCLComponent

TLCLComponent - base class for LCL components

TComponent,IUnknown,IInterfaceComponentReference

TPersistent

TObject