"TfrxComponent"是所有FastReport組件的基類，這種類型的對象擁有“coordinates”, “size”, “font” ，“visibility” 以及一系列子對象。該類用過多種方法，允許保存和恢復對象狀態(tài)。本文主要介紹FastReport VCL報表的的類層次結構中的"TfrxComponent"基類。

TfrxComponent = class(TComponent)
protected
procedure SetParent(AParent: TfrxComponent); virtual;
procedure SetLeft(Value: Extended); virtual;
procedure SetTop(Value: Extended); virtual;
procedure SetWidth(Value: Extended); virtual;
procedure SetHeight(Value: Extended); virtual;
procedure SetFont(Value: TFont); virtual;
procedure SetParentFont(Value: Boolean); virtual;
procedure SetVisible(Value: Boolean); virtual;
procedure FontChanged(Sender: TObject); virtual;
public
constructor Create(AOwner: TComponent); override;
procedure Assign(Source: TPersistent); override;
procedure Clear; virtual;
procedure CreateUniqueName;
procedure LoadFromStream(Stream: TStream); virtual;
procedure SaveToStream(Stream: TStream); virtual;
procedure SetBounds(ALeft, ATop, AWidth, AHeight: Extended);
function FindObject(const AName: String): TfrxComponent;
class function GetDescription: String; virtual;

property Objects: TList readonly;
property AllObjects: TList readonly;
property Parent: TfrxComponent;
property Page: TfrxPage readonly;
property Report: TfrxReport readonly;
property IsDesigning: Boolean;
property IsLoading: Boolean;
property IsPrinting: Boolean;
property BaseName: String;
property Left: Extended;
property Top: Extended;
property Width: Extended;
property Height: Extended;
property AbsLeft: Extended readonly;
property AbsTop: Extended readonly;
property Font: TFont;
property ParentFont: Boolean;
property Restrictions: TfrxRestrictions;
property Visible: Boolean;
end;

• Clear：清除對象內容，并刪除它的所有子對象
• CreateUniqueName：創(chuàng)建對象的唯一名稱
• LoadFromStream：加載對象以及流中的所有子對象
• SaveToStream：保存對象到流
• SetBounds：設定對象的坐標和大小
• FindObject：在子對象中搜索指定了名稱的對象
• GetDescription：返回對象描述

當你修改相應的屬性時候，會調用下列方法。如何你需要額外處理，你需要覆蓋它們。

- SetParent
- SetLeft
- SetTop
- SetWidth
- SetHeight
- SetFont
- SetParentFont
- SetVisible
- FontChanged

在“TfrxComponent”類中定義了以下屬性：

• Objects：list of child objects
• AllObjects：list of all subordinate objects
• Parent： link to parent object
• Page：link to report page on which object resides
• Report link：to report in which object appears
• IsDesigning： “True” if designer is running
• IsLoading ：“True” if object is being loaded from stream
• IsPrinting ：“True” if object is being printed out
• BaseName： object base name; this value is used in “CreateUniqueName” method
• Left object： X-coordinate (relative to parent)
• Top ：object Y-coordinate (relative to parent)
• Width： object width
• Height ：object height
• AbsLeft ：object absolute X-coordinate
• AbsTop ：object absolute Y-coordinate
• Font ：object font
• ParentFont： if “True” then uses parent object font settings
• Restrictionsset of flags which restricts one or more object operations
• Visible ：object visibility