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FastReport VCL是用于 Delphi、C++ Builder、RAD Studio 和 Lazarus 的报告和文档创建 VCL 库。它提供了可视化模板设计器，可以访问 30 多种格式，并可以部署到云、网站、电子邮件和打印中。

立即点击下载FastReport VCL v6.9最新版

FastReport 包含一组常用控件，可以放置在报表内的对话表单上。它们如下：

  TfrxLabelControl
  TfrxEditControl
  TfrxMemoControl
  TfrxButtonControl
  TfrxCheckBoxControl
  TfrxRadioButtonControl
  TfrxListBoxControl
  TfrxComboBoxControl
  TfrxDateEditControl
  TfrxImageControl
  TfrxBevelControl
  TfrxPanelControl
  TfrxGroupBoxControl
  TfrxBitBtnControl
  TfrxSpeedButtonControl
  TfrxMaskEditControl
  TfrxCheckListBoxControl

所有公共控件的基本类是TfrxDialogControl在 frxClass 文件中声明的类：

  TfrxDialogControl = class(TfrxReportComponent)
  protected
    procedure InitControl(AControl: TControl);
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    class function GetDescription: String; virtual;
    property Caption: String;
    property Color: TColor;
    property Control: TControl;
    property OnClick: TfrxNotifyEvent;
    property OnDblClick: TfrxNotifyEvent;
    property OnEnter: TfrxNotifyEvent;
    property OnExit: TfrxNotifyEvent;
    property OnKeyDown: TfrxKeyEvent;
    property OnKeyPress: TfrxKeyPressEvent;
    property OnKeyUp: TfrxKeyEvent;
    property OnMouseDown: TfrxMouseEvent;
    property OnMouseMove: TfrxMouseMoveEvent;
    property OnMouseUp: TfrxMouseEvent;
  published
    property Left;
    property Top;
    property Width;
    property Height;
    property Font;
    property ParentFont;
    property Enabled: Boolean;
    property Visible;
  end;

公共控件的注册和删除是通过frxObjectsfrxDsgnIntf 文件中声明的全局对象方法执行的：

frxObjects.RegisterObject(ClassRef: TfrxComponentClass; ButtonBmp: TBitmap);
frxObjects.Unregister(ClassRef: TfrxComponentClass);

例如，让我们检查通用控件的示例，它简化了标准 DelphiTBitBtn控件的功能。

uses frxClass, frxDsgnIntf, Buttons;

type
  TfrxBitBtnControl = class(TfrxDialogControl)
  private
    FButton: TBitBtn;
    procedure SetKind(const Value: TBitBtnKind);
    function GetKind: TBitBtnKind;
  public
    constructor Create(AOwner: TComponent); override;
    class function GetDescription: String; override;
    property Button: TBitBtn read FButton;
  published
    { add new properties }
    property Kind: TBitBtnKind read GetKind write SetKind default bkCustom;
    { these properties are already declared in  parent class }
    property Caption;
    property OnClick;
    property OnEnter;
    property OnExit;
    property OnKeyDown;
    property OnKeyPress;
    property OnKeyUp;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
  end;

constructor TfrxBitBtnControl.Create(AOwner: TComponent);
begin
  { default constructor }
  inherited;
  { create  required common control }
  FButton := TBitBtn.Create(nil);
  FButton.Caption := 'BitBtn';
  { initialize it }
  InitControl(FButton);
  { it will have such size by default }
  Width := 75;
  Height := 25;
end;

class function TfrxBitBtnControl.GetDescription: String;
begin
  Result := 'BitBtn control';
end;

procedure TfrxBitBtnControl.SetKind(const Value: TBitBtnKind);
begin
  FButton.Kind := Value;
end;

function TfrxBitBtnControl.GetKind: TBitBtnKind;
begin
  Result := FButton.Kind;
end;

var
  Bmp: TBitmap;

initialization
  Bmp := TBitmap.Create;
  {Load picture from resource. Of course, you should beforehand place it there.}
  Bmp.LoadFromResourceName(hInstance, 'frxBitBtnControl');
  frxObjects.RegisterObject(TfrxBitBtnControl, Bmp);

finalization
  frxObjects.Unregister(TfrxBitBtnControl);
  Bmp.Free;

end.

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