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{
This file is part of the Free Component Library (FCL)
Copyright (c) 1999-2000 by the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{****************************************************************************}
{* TPersistent *}
{****************************************************************************}
procedure TPersistent.AssignError(Source: TPersistent);
Var SourceName : String;
begin
If Source<>Nil then
SourceName:=Source.ClassName
else
SourceName:='Nil';
raise EConvertError.CreateFmt (SAssignError,[SourceName,ClassName]);
end;
procedure TPersistent.AssignTo(Dest: TPersistent);
begin
Dest.AssignError(Self);
end;
procedure TPersistent.DefineProperties(Filer: TFiler);
begin
end;
function TPersistent.GetOwner: TPersistent;
begin
Result:=Nil;
end;
destructor TPersistent.Destroy;
begin
If Assigned(FObservers) then
begin
FPONotifyObservers(Self,ooFree,Nil);
FreeAndNil(FObservers);
end;
inherited Destroy;
end;
procedure TPersistent.FPOAttachObserver(AObserver: TObject);
Var
I : IFPObserver;
begin
If Not AObserver.GetInterface(SGUIDObserver,I) then
Raise EObserver.CreateFmt(SErrNotObserver,[AObserver.ClassName]);
If not Assigned(FObservers) then
FObservers:=TFPList.Create;
FObservers.Add(I);
end;
procedure TPersistent.FPODetachObserver(AObserver: TObject);
Var
I : IFPObserver;
begin
If Not AObserver.GetInterface(SGUIDObserver,I) then
Raise EObserver.CreateFmt(SErrNotObserver,[AObserver.ClassName]);
If Assigned(FObservers) then
begin
FObservers.Remove(I);
If (FObservers.Count=0) then
FreeAndNil(FObservers);
end;
end;
procedure TPersistent.FPONotifyObservers(ASender: TObject;
AOperation: TFPObservedOperation; Data : Pointer);
Var
I : Integer;
Obs : IFPObserver;
begin
If Assigned(FObservers) then
For I:=FObservers.Count-1 downto 0 do
begin
Obs:=IFPObserver(FObservers[i]);
Obs.FPOObservedChanged(Self,AOperation,Data);
end;
end;
procedure TPersistent.Assign(Source: TPersistent);
begin
If Source<>Nil then
Source.AssignTo(Self)
else
AssignError(Nil);
end;
function TPersistent.GetNamePath: string;
Var OwnerName :String;
TheOwner: TPersistent;
begin
Result:=ClassName;
TheOwner:=GetOwner;
If TheOwner<>Nil then
begin
OwnerName:=TheOwner.GetNamePath;
If OwnerName<>'' then Result:=OwnerName+'.'+Result;
end;
end;
{****************************************************************************}
{* TInterfacedPersistent *}
{****************************************************************************}
procedure TInterfacedPersistent.AfterConstruction;
Var TheOwner: TPersistent;
begin
inherited;
TheOwner:=GetOwner;
if assigned(TheOwner) then
TheOwner.GetInterface(IUnknown,FOwnerInterface);
end;
function TInterfacedPersistent._AddRef: Integer;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
begin
if assigned(FOwnerInterface) then
Result:=FOwnerInterface._AddRef
else
Result:=-1;
end;
function TInterfacedPersistent._Release: Integer;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
begin
if assigned(FOwnerInterface) then
Result:=FOwnerInterface._Release
else
Result:=-1;
end;
function TInterfacedPersistent.QueryInterface({$IFDEF FPC_HAS_CONSTREF}constref{$ELSE}const{$ENDIF} IID: TGUID; out Obj): HResult;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
begin
if GetInterface(IID, Obj) then
Result:=0
else
Result:=HResult($80004002);
end;
{****************************************************************************}
{* TRecall *}
{****************************************************************************}
constructor TRecall.Create(AStorage,AReference: TPersistent);
begin
inherited Create;
FStorage:=AStorage;
FReference:=AReference;
Store;
end;
destructor TRecall.Destroy;
begin
if Assigned(FReference) then
FReference.Assign(FStorage);
Forget;
inherited;
end;
procedure TRecall.Forget;
begin
FReference:=nil;
FreeAndNil(FStorage);
end;
procedure TRecall.Store;
begin
if Assigned(FStorage) and Assigned(FReference) then
FStorage.Assign(FReference);
end;
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