TRichEdit

Code:

unit dbrich;

interface

uses

Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,

StdCtrls, ComCtrls, DB, DBTables, Menus, ExtCtrls, Mask, Buttons, DBCtrls;

//Замечание: вызывать Tablex.Edit необходимо перед изменением свойства paragraph

type

TDBRichEdit = class(TRichEdit)

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 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 Notification(AComponent: TComponent;

     Operation: TOperation); override;

   procedure WndProc(var Message: TMessage); override;

public

   constructor Create(AOwner: TComponent); override;

   destructor Destroy; override;

   procedure LoadMemo;

   property   Field: TField read GetField;

published

   property AutoDisplay: Boolean read FAutoDisplay write SetAutoDisplay

     default True;

   property DataField: string read GetDataField write SetDataField;

   property DataSource: TDataSource read GetDataSource write SetDataSource;

   property ReadOnly: Boolean read GetReadOnly write SetReadOnly

     default False;

end;

procedure Register;

implementation

procedure Register;

begin

RegisterComponents('Data Controls', [TDBRichEdit]);

end;

{Mostly copied from DBMemo}

constructor TDBRichEdit.Create(AOwner: TComponent);

begin

inherited Create(AOwner);

inherited ReadOnly := True;

FAutoDisplay := True;

FDataLink := TFieldDataLink.Create;

FDataLink.Control := Self;

FDataLink.OnDataChange := DataChange;

FDataLink.OnEditingChange := EditingChange;

FDataLink.OnUpdateData := UpdateData;

FPaintControl := TPaintControl.Create(Self, 'EDIT');

end;

destructor TDBRichEdit.Destroy;

begin

FPaintControl.Free;

FDataLink.Free;

FDataLink := nil;

inherited Destroy;

end;

procedure TDBRichEdit.Notification(AComponent: TComponent;

Operation: TOperation);

begin

inherited Notification(AComponent, Operation);

if (Operation = opRemove) and (FDataLink <> nil) and

   (AComponent = DataSource) then DataSource := nil;

end;

procedure TDBRichEdit.KeyDown(var Key: Word; Shift: TShiftState);

begin

inherited KeyDown(Key, Shift);

if FMemoLoaded then

begin

   if (Key = VK_DELETE) or ((Key = VK_INSERT) and (ssShift in Shift)) then

     FDataLink.Edit;

end else

   Key := 0;

end;

procedure TDBRichEdit.KeyPress(var Key: Char);

begin

inherited KeyPress(Key);

if FMemoLoaded then

begin

   if (Key in [#32..#255]) and (FDataLink.Field <> nil) and

     not FDataLink.Field.IsValidChar(Key) then

   begin

     MessageBeep(0);

     Key := #0;

   end;

   case Key of

     ^H, ^I, ^J, ^M, ^V, ^X, #32..#255:

       FDataLink.Edit;

     #27:

       FDataLink.Reset;

   end;

end else

begin

   if Key = #13 then LoadMemo;

   Key := #0;

end;

end;

procedure TDBRichEdit.Change;

begin

with FdataLink do

begin

   {if Assigned(FdataLink) and (Assigned(DataSource))and

    (DataSource.State = dsBrowse) then

     Edit; } {make sure edits on Attributes change}

   if FMemoLoaded then Modified;

end;

FMemoLoaded := True;

inherited Change;

end;

function TDBRichEdit.GetDataSource: TDataSource;

begin

Result := FDataLink.DataSource;

end;

procedure TDBRichEdit.SetDataSource(Value: TDataSource);

begin

FDataLink.DataSource := Value;

if Value <> nil then Value.FreeNotification(Self);

end;

function TDBRichEdit.GetDataField: string;

begin

Result := FDataLink.FieldName;

end;

procedure TDBRichEdit.SetDataField(const Value: string);

begin

FDataLink.FieldName := Value;

end;

function TDBRichEdit.GetReadOnly: Boolean;

begin

Result := FDataLink.ReadOnly;

end;