dbctrls.pas

这是不可多得的源代码

    property DragMode;
    property DropDownCount;
    property Enabled;
    property Font;
    property ImeMode;
    property ImeName;
    property ItemHeight;
    property Items write SetItems;
    property ParentBiDiMode;
    property ParentColor;
    property ParentCtl3D;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
    property ShowHint;
    property Sorted;
    property TabOrder;
    property TabStop;
    property Visible;
    property OnChange;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnDrawItem;
    property OnDropDown;
    property OnEndDock;
    property OnEndDrag;
    property OnEnter;
    property OnExit;
    property OnKeyDown;
    property OnKeyPress;
    property OnKeyUp;
    property OnMeasureItem;
    property OnStartDock;
    property OnStartDrag;
  end;

{ TDBListBox }

  TDBListBox = class(TCustomListBox)
  private
    FDataLink: TFieldDataLink;
    procedure DataChange(Sender: TObject);
    procedure UpdateData(Sender: TObject);
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetReadOnly: Boolean;
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure SetReadOnly(Value: Boolean);
    procedure SetItems(Value: TStrings);
    procedure WMLButtonDown(var Message: TWMLButtonDown); message WM_LBUTTONDOWN;
    procedure CMExit(var Message: TCMExit); message CM_EXIT;
    procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
  protected
    procedure Click; override;
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    procedure Notification(AComponent: TComponent;
      Operation: TOperation); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    function ExecuteAction(Action: TBasicAction): Boolean; override;
    function UpdateAction(Action: TBasicAction): Boolean; override;
    function UseRightToLeftAlignment: Boolean; override;
    property Field: TField read GetField;
  published
    property Align;
    property Anchors;
    property AutoComplete;    
    property BevelEdges;
    property BevelInner;
    property BevelOuter;
    property BevelKind;
    property BevelWidth;
    property BiDiMode;
    property BorderStyle;
    property Color;
    property Constraints;
    property Ctl3D default True;
    property DataField: string read GetDataField write SetDataField;
    property DataSource: TDataSource read GetDataSource write SetDataSource;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Enabled;
    property Font;
    property ImeMode;
    property ImeName;
    property IntegralHeight;
    property ItemHeight;
    property Items write SetItems;
    property ParentBiDiMode;
    property ParentColor;
    property ParentCtl3D;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
    property ShowHint;
    property Style;
    property TabOrder;
    property TabStop;
    property Visible;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnDrawItem;
    property OnEndDock;
    property OnEndDrag;
    property OnEnter;
    property OnExit;
    property OnKeyDown;
    property OnKeyPress;
    property OnKeyUp;
    property OnMeasureItem;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnStartDock;
    property OnStartDrag;
  end;

{ TDBRadioGroup }

  TDBRadioGroup = class(TCustomRadioGroup)
  private
    FDataLink: TFieldDataLink;
    FValue: string;
    FValues: TStrings;
    FInSetValue: Boolean;
    FOnChange: TNotifyEvent;
    procedure DataChange(Sender: TObject);
    procedure UpdateData(Sender: TObject);
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetReadOnly: Boolean;
    function GetButtonValue(Index: Integer): string;
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure SetReadOnly(Value: Boolean);
    procedure SetValue(const Value: string);
    procedure SetItems(Value: TStrings);
    procedure SetValues(Value: TStrings);
    procedure CMExit(var Message: TCMExit); message CM_EXIT;
    procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
  protected
    procedure Change; dynamic;
    procedure Click; override;
    procedure KeyPress(var Key: Char); override;
    function CanModify: Boolean; override;
    procedure Notification(AComponent: TComponent;
      Operation: TOperation); override;
    property DataLink: TFieldDataLink read FDataLink;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    function ExecuteAction(Action: TBasicAction): Boolean; override;
    function UpdateAction(Action: TBasicAction): Boolean; override;
    function UseRightToLeftAlignment: Boolean; override;
    property Field: TField read GetField;
    property ItemIndex;
    property Value: string read FValue write SetValue;
  published
    property Align;
    property Anchors;
    property BiDiMode;
    property Caption;
    property Color;
    property Columns;
    property Constraints;
    property Ctl3D;
    property DataField: string read GetDataField write SetDataField;
    property DataSource: TDataSource read GetDataSource write SetDataSource;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Enabled;
    property Font;
    property Items write SetItems;
    property ParentBiDiMode;
    property ParentColor;
    property ParentCtl3D;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
    property ShowHint;
    property TabOrder;
    property TabStop;
    property Values: TStrings read FValues write SetValues;
    property Visible;
    property OnChange: TNotifyEvent read FOnChange write FOnChange;
    property OnClick;
    property OnContextPopup;
    property OnDragDrop;
    property OnDragOver;
    property OnEndDock;
    property OnEndDrag;
    property OnEnter;
    property OnExit;
    property OnStartDock;
    property OnStartDrag;
  end;

{ TDBMemo }

  TDBMemo = class(TCustomMemo)
  private
    FDataLink: TFieldDataLink;
    FAutoDisplay: Boolean;
    FFocused: Boolean;
    FMemoLoaded: Boolean;
    FPaintControl: TPaintControl;
    procedure DataChange(Sender: TObject);
    procedure EditingChange(Sender: TObject);
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetReadOnly: Boolean;
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure SetReadOnly(Value: Boolean);
    procedure SetAutoDisplay(Value: Boolean);
    procedure SetFocused(Value: Boolean);
    procedure UpdateData(Sender: TObject);
    procedure WMCut(var Message: TMessage); message WM_CUT;
    procedure WMPaste(var Message: TMessage); message WM_PASTE;
    procedure WMUndo(var Message: TMessage); message WM_UNDO;
    procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
    procedure CMExit(var Message: TCMExit); message CM_EXIT;
    procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message WM_LBUTTONDBLCLK;
    procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
    procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
  protected
    procedure Change; override;
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    procedure Loaded; override;
    procedure Notification(AComponent: TComponent;
      Operation: TOperation); override;
    procedure WndProc(var Message: TMessage); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    function ExecuteAction(Action: TBasicAction): Boolean; override;
    procedure LoadMemo; virtual;
    function UpdateAction(Action: TBasicAction): Boolean; override;
    function UseRightToLeftAlignment: Boolean; override;
    property Field: TField read GetField;
  published
    property Align;
    property Alignment;
    property Anchors;
    property AutoDisplay: Boolean read FAutoDisplay write SetAutoDisplay default True;
    property BevelEdges;
    property BevelInner;
    property BevelOuter;
    property BevelKind;
    property BevelWidth;
    property BiDiMode;
    property BorderStyle;
    property Color;
    property Constraints;
    property Ctl3D;
    property DataField: string read GetDataField write SetDataField;
    property DataSource: TDataSource read GetDataSource write SetDataSource;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Enabled;
    property Font;
    property HideSelection;    
    property ImeMode;
    property ImeName;
    property MaxLength;
    property ParentBiDiMode;
    property ParentColor;
    property ParentCtl3D;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
    property ScrollBars;
    property ShowHint;
    property TabOrder;
    property TabStop;
    property Visible;
    property WantReturns;
    property WantTabs;
    property WordWrap;
    property OnChange;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnEndDock;
    property OnEndDrag;
    property OnEnter;
    property OnExit;
    property OnKeyDown;
    property OnKeyPress;
    property OnKeyUp;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnStartDock;
    property OnStartDrag;
  end;

{ TDBImage }

  TDBImage = class(TCustomControl)
  private
    FDataLink: TFieldDataLink;
    FPicture: TPicture;
    FBorderStyle: TBorderStyle;
    FAutoDisplay: Boolean;
    FStretch: Boolean;
    FCenter: Boolean;
    FPictureLoaded: Boolean;
    FQuickDraw: Boolean;
    procedure DataChange(Sender: TObject);
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetReadOnly: Boolean;
    procedure PictureChanged(Sender: TObject);
    procedure SetAutoDisplay(Value: Boolean);
    procedure SetBorderStyle(Value: TBorderStyle);
    procedure SetCenter(Value: Boolean);
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure SetPicture(Value: TPicture);
    procedure SetReadOnly(Value: Boolean);
    procedure SetStretch(Value: Boolean);
    procedure UpdateData(Sender: TObject);
    procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
    procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
    procedure CMExit(var Message: TCMExit); message CM_EXIT;
    procedure CMTextChanged(var Message: TMessage); message CM_TEXTCHANGED;
    procedure WMLButtonDown(var Message: TWMLButtonDown); message WM_LBUTTONDOWN;
    procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message WM_LBUTTONDBLCLK;
    procedure WMCut(var Message: TMessage); message WM_CUT;
    procedure WMCopy(var Message: TMessage); message WM_COPY;
    procedure WMPaste(var Message: TMessage); message WM_PASTE;
    procedure WMSize(var Message: TMessage); message WM_SIZE;
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    function GetPalette: HPALETTE; override;
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    procedure Notification(AComponent: TComponent;
      Operation: TOperation); override;
    procedure Paint; override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    procedure CopyToClipboard;
    procedure CutToClipboard;
    function ExecuteAction(Action: TBasicAction): Boolean; override;
    procedure LoadPicture;
    procedure PasteFromClipboard;
    function UpdateAction(Action: TBasicAction): Boolean; override;
    property Field: TField read GetField;
    property Picture: TPicture read FPicture write SetPicture;
  published
    property Align;
    property Anchors;
    property AutoDisplay: Boolean read FAutoDisplay write SetAutoDisplay default True;
    property BorderStyle: TBorderStyle read FBorderStyle write SetBorderStyle default bsSingle;
    property Center: Boolean read FCenter write SetCenter default True;
    property Color;
    property Constraints;
    property Ctl3D;
    property DataField: string read GetDataField write SetDataField;
    property DataSource: TDataSource read GetDataSource write SetDataSource;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Enabled;
    property Font;
    property ParentColor default False;
    property ParentCtl3D;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
    property QuickDraw: Boolean read FQuickDraw write FQuickDraw default True;
    property ShowHint;
    property Stretch: Boolean read FStretch write SetStretch default False;
    property TabOrder;
    property TabStop default True;
    property Visible;