dbctrls.pas

这是不可多得的源代码

{*******************************************************}
{                                                       }
{       Borland Delphi Visual Component Library         }
{                                                       }
{       Copyright (c) 1995,99 Inprise Corporation       }
{                                                       }
{*******************************************************}

unit DBCtrls;

{$R-,H+,X+}

interface

uses Variants, Windows, SysUtils, Messages, Controls, Forms, Classes, 
     Graphics, Menus, StdCtrls, ExtCtrls, Mask, Buttons, ComCtrls, DB;

type

{ TFieldDataLink }

  TFieldDataLink = class(TDataLink)
  private
    FField: TField;
    FFieldName: string;
    FControl: TComponent;
    FEditing: Boolean;
    FModified: Boolean;
    FOnDataChange: TNotifyEvent;
    FOnEditingChange: TNotifyEvent;
    FOnUpdateData: TNotifyEvent;
    FOnActiveChange: TNotifyEvent;
    function GetCanModify: Boolean;
    procedure SetEditing(Value: Boolean);
    procedure SetField(Value: TField);
    procedure SetFieldName(const Value: string);
    procedure UpdateField;
    procedure UpdateRightToLeft;
  protected
    procedure ActiveChanged; override;
    procedure DataEvent(Event: TDataEvent; Info: Integer); override;
    procedure EditingChanged; override;
    procedure FocusControl(Field: TFieldRef); override;
    procedure LayoutChanged; override;
    procedure RecordChanged(Field: TField); override;
    procedure UpdateData; override;
  public
    constructor Create;
    function Edit: Boolean;
    procedure Modified;
    procedure Reset;
    property CanModify: Boolean read GetCanModify;
    property Control: TComponent read FControl write FControl;
    property Editing: Boolean read FEditing;
    property Field: TField read FField;
    property FieldName: string read FFieldName write SetFieldName;
    property OnDataChange: TNotifyEvent read FOnDataChange write FOnDataChange;
    property OnEditingChange: TNotifyEvent read FOnEditingChange write FOnEditingChange;
    property OnUpdateData: TNotifyEvent read FOnUpdateData write FOnUpdateData;
    property OnActiveChange: TNotifyEvent read FOnActiveChange write FOnActiveChange;
  end;

{ TPaintControl }

  TPaintControl = class
  private
    FOwner: TWinControl;
    FClassName: string;
    FHandle: HWnd;
    FObjectInstance: Pointer;
    FDefWindowProc: Pointer;
    FCtl3dButton: Boolean;
    function GetHandle: HWnd;
    procedure SetCtl3DButton(Value: Boolean);
    procedure WndProc(var Message: TMessage);
  public
    constructor Create(AOwner: TWinControl; const ClassName: string);
    destructor Destroy; override;
    procedure DestroyHandle;
    property Ctl3DButton: Boolean read FCtl3dButton write SetCtl3dButton;
    property Handle: HWnd read GetHandle;
  end;

{ TDBEdit }

  TDBEdit = class(TCustomMaskEdit)
  private
    FDataLink: TFieldDataLink;
    FCanvas: TControlCanvas;
    FAlignment: TAlignment;
    FFocused: Boolean;
    procedure ActiveChange(Sender: TObject);
    procedure DataChange(Sender: TObject);
    procedure EditingChange(Sender: TObject);
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetReadOnly: Boolean;
    function GetTextMargins: TPoint;
    procedure ResetMaxLength;
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure SetFocused(Value: Boolean);
    procedure SetReadOnly(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 WMPaint(var Message: TWMPaint); message WM_PAINT;
    procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
  protected
    procedure Change; override;
    function EditCanModify: Boolean; 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 Reset; 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 Anchors;
    property AutoSelect;
    property AutoSize;
    property BevelEdges;
    property BevelInner;
    property BevelOuter;
    property BevelKind;
    property BevelWidth;
    property BiDiMode;
    property BorderStyle;
    property CharCase;
    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 ImeMode;
    property ImeName;
    property MaxLength;
    property ParentBiDiMode;
    property ParentColor;
    property ParentCtl3D;
    property ParentFont;
    property ParentShowHint;
    property PasswordChar;
    property PopupMenu;
    property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
    property ShowHint;
    property TabOrder;
    property TabStop;
    property Visible;
    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;

{ TDBText }

  TDBText = class(TCustomLabel)
  private
    FDataLink: TFieldDataLink;
    procedure DataChange(Sender: TObject);
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetFieldText: string;
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
  protected
    function GetLabelText: string; override;
    procedure Loaded; override;
    procedure Notification(AComponent: TComponent;
      Operation: TOperation); override;
    procedure SetAutoSize(Value: Boolean); 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 Alignment;
    property Anchors;
    property AutoSize default False;
    property BiDiMode;
    property Color;
    property Constraints;
    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 ParentBiDiMode;
    property ParentColor;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property Transparent;
    property ShowHint;
    property Visible;
    property WordWrap;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnEndDock;
    property OnEndDrag;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnStartDock;
    property OnStartDrag;
  end;

{ TDBCheckBox }

  TDBCheckBox = class(TCustomCheckBox)
  private
    FDataLink: TFieldDataLink;
    FValueCheck: string;
    FValueUncheck: string;
    FPaintControl: TPaintControl;
    procedure DataChange(Sender: TObject);
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetFieldState: TCheckBoxState;
    function GetReadOnly: Boolean;
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure SetReadOnly(Value: Boolean);
    procedure SetValueCheck(const Value: string);
    procedure SetValueUncheck(const Value: string);
    procedure UpdateData(Sender: TObject);
    function ValueMatch(const ValueList, Value: string): Boolean;
    procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
    procedure CMExit(var Message: TCMExit); message CM_EXIT;
    procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
  protected
    procedure Toggle; override;
    procedure KeyPress(var Key: Char); 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;
    function UpdateAction(Action: TBasicAction): Boolean; override;
    function UseRightToLeftAlignment: Boolean; override;
    property Checked;
    property Field: TField read GetField;
    property State;
  published
    property Action;
    property Alignment;
    property AllowGrayed;
    property Anchors;
    property BiDiMode;
    property Caption;
    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 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 ValueChecked: string read FValueCheck write SetValueCheck;
    property ValueUnchecked: string read FValueUncheck write SetValueUncheck;
    property Visible;
    property WordWrap;
    property OnClick;
    property OnContextPopup;
    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;

{ TDBComboBox }

  TDBComboBox = class(TCustomComboBox)
  private
    FDataLink: TFieldDataLink;
    FPaintControl: TPaintControl;
    procedure DataChange(Sender: TObject);
    procedure EditingChange(Sender: TObject);
    function GetComboText: string;
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetReadOnly: Boolean;
    procedure SetComboText(const Value: string);
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure SetEditReadOnly;
    procedure SetReadOnly(Value: Boolean);
    procedure UpdateData(Sender: TObject);
    procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
    procedure CMExit(var Message: TCMExit); message CM_EXIT;
    procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
    procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
  protected
    procedure Change; override;
    procedure Click; override;
    procedure ComboWndProc(var Message: TMessage; ComboWnd: HWnd;
      ComboProc: Pointer); override;
    procedure CreateWnd; override;
    procedure DropDown; 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 SetItems(const Value: TStrings); override;
    procedure SetStyle(Value: TComboboxStyle); override;
    procedure WndProc(var Message: TMessage); 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;
    property Text;
  published
    property Style; {Must be published before Items}
    property Anchors;
    property AutoComplete;
    property AutoDropDown;
    property BevelEdges;
    property BevelInner;
    property BevelOuter;
    property BevelKind;
    property BevelWidth;
    property BiDiMode;
    property CharCase;
    property Color;
    property Constraints;
    property Ctl3D;
    property DataField: string read GetDataField write SetDataField;
    property DataSource: TDataSource read GetDataSource write SetDataSource;
    property DragCursor;
    property DragKind;