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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.
**********************************************************************}
{****************************************************************************}
{* TComponentEnumerator *}
{****************************************************************************}
constructor TComponentEnumerator.Create(AComponent: TComponent);
begin
inherited Create;
FComponent := AComponent;
FPosition := -1;
end;
function TComponentEnumerator.GetCurrent: TComponent;
begin
Result := FComponent.Components[FPosition];
end;
function TComponentEnumerator.MoveNext: Boolean;
begin
Inc(FPosition);
Result := FPosition < FComponent.ComponentCount;
end;
{****************************************************************************}
{* TComponent *}
{****************************************************************************}
function TComponent.GetComObject: IUnknown;
begin
{ Check if VCLComObject is not assigned - we need to create it by }
{ the call to CreateVCLComObject routine. If in the end we are still }
{ have no valid VCLComObject pointer we need to raise an exception }
if not Assigned(VCLComObject) then
begin
if Assigned(CreateVCLComObjectProc) then
CreateVCLComObjectProc(Self);
if not Assigned(VCLComObject) then
raise EComponentError.CreateFmt(SNoComSupport,[Name]);
end;
{ VCLComObject is IVCComObject but we need to return IUnknown }
IVCLComObject(VCLComObject).QueryInterface(IUnknown, Result);
end;
Function TComponent.GetComponent(AIndex: Integer): TComponent;
begin
If not assigned(FComponents) then
Result:=Nil
else
Result:=TComponent(FComponents.Items[Aindex]);
end;
function TComponent.IsImplementorOf (const Intf:IInterface):boolean;
var ref : IInterfaceComponentReference;
begin
result:=assigned(intf) and supports(intf,IInterfaceComponentReference,ref);
if result then
result:=ref.getcomponent=self;
end;
procedure TComponent.ReferenceInterface(const intf:IInterface;op:TOperation);
var ref : IInterfaceComponentReference;
comp : TComponent;
begin
if assigned(intf) and supports(intf,IInterfaceComponentReference,ref) then
begin
comp:=ref.getcomponent;
if op = opInsert then
comp.FreeNotification(Self)
else
comp.RemoveFreeNotification(Self);
end;
end;
Function TComponent.GetComponentCount: Integer;
begin
If not assigned(FComponents) then
result:=0
else
Result:=FComponents.Count;
end;
Function TComponent.GetComponentIndex: Integer;
begin
If Assigned(FOwner) and Assigned(FOwner.FComponents) then
Result:=FOWner.FComponents.IndexOf(Self)
else
Result:=-1;
end;
Procedure TComponent.Insert(AComponent: TComponent);
begin
If not assigned(FComponents) then
FComponents:=TFpList.Create;
FComponents.Add(AComponent);
AComponent.FOwner:=Self;
end;
Procedure TComponent.ReadLeft(Reader: TReader);
begin
LongRec(FDesignInfo).Lo:=Reader.ReadInteger;
end;
Procedure TComponent.ReadTop(Reader: TReader);
begin
LongRec(FDesignInfo).Hi:=Reader.ReadInteger;
end;
Procedure TComponent.Remove(AComponent: TComponent);
begin
AComponent.FOwner:=Nil;
If assigned(FCOmponents) then
begin
FComponents.Remove(AComponent);
IF FComponents.Count=0 then
begin
FComponents.Free;
FComponents:=Nil;
end;
end;
end;
Procedure TComponent.RemoveNotification(AComponent: TComponent);
begin
if FFreeNotifies<>nil then
begin
FFreeNotifies.Remove(AComponent);
if FFreeNotifies.Count=0 then
begin
FFreeNotifies.Free;
FFreeNotifies:=nil;
Exclude(FComponentState,csFreeNotification);
end;
end;
end;
Procedure TComponent.SetComponentIndex(Value: Integer);
Var Temp,Count : longint;
begin
If Not assigned(Fowner) then exit;
Temp:=getcomponentindex;
If temp<0 then exit;
If value<0 then value:=0;
Count:=Fowner.FComponents.Count;
If Value>=Count then value:=count-1;
If Value<>Temp then
begin
FOWner.FComponents.Delete(Temp);
FOwner.FComponents.Insert(Value,Self);
end;
end;
Procedure TComponent.SetReference(Enable: Boolean);
var
Field: ^TComponent;
begin
if Assigned(Owner) then
begin
Field := Owner.FieldAddress(Name);
if Assigned(Field) then
if Enable then
Field^ := Self
else
Field^ := nil;
end;
end;
Procedure TComponent.WriteLeft(Writer: TWriter);
begin
Writer.WriteInteger(LongRec(FDesignInfo).Lo);
end;
Procedure TComponent.WriteTop(Writer: TWriter);
begin
Writer.WriteInteger(LongRec(FDesignInfo).Hi);
end;
Procedure TComponent.ChangeName(const NewName: TComponentName);
begin
FName:=NewName;
end;
Procedure TComponent.DefineProperties(Filer: TFiler);
Var Ancestor : TComponent;
Temp : longint;
begin
Temp:=0;
Ancestor:=TComponent(Filer.Ancestor);
If Assigned(Ancestor) then Temp:=Ancestor.FDesignInfo;
Filer.Defineproperty('left',@readleft,@writeleft,
(longrec(FDesignInfo).Lo<>Longrec(temp).Lo));
Filer.Defineproperty('top',@readtop,@writetop,
(longrec(FDesignInfo).Hi<>Longrec(temp).Hi));
end;
Procedure TComponent.GetChildren(Proc: TGetChildProc; Root: TComponent);
begin
// Does nothing.
end;
Function TComponent.GetChildOwner: TComponent;
begin
Result:=Nil;
end;
Function TComponent.GetChildParent: TComponent;
begin
Result:=Self;
end;
Function TComponent.GetEnumerator: TComponentEnumerator;
begin
Result:=TComponentEnumerator.Create(Self);
end;
Function TComponent.GetNamePath: string;
begin
Result:=FName;
end;
Function TComponent.GetOwner: TPersistent;
begin
Result:=FOwner;
end;
Procedure TComponent.Loaded;
begin
Exclude(FComponentState,csLoading);
end;
Procedure TComponent.Loading;
begin
Include(FComponentState,csLoading);
end;
Procedure TComponent.Notification(AComponent: TComponent;
Operation: TOperation);
Var
C : Longint;
begin
If (Operation=opRemove) then
RemoveFreeNotification(AComponent);
If Not assigned(FComponents) then
exit;
C:=FComponents.Count-1;
While (C>=0) do
begin
TComponent(FComponents.Items[C]).Notification(AComponent,Operation);
Dec(C);
if C>=FComponents.Count then
C:=FComponents.Count-1;
end;
end;
procedure TComponent.PaletteCreated;
begin
end;
Procedure TComponent.ReadState(Reader: TReader);
begin
Reader.ReadData(Self);
end;
Procedure TComponent.SetAncestor(Value: Boolean);
Var Runner : Longint;
begin
If Value then
Include(FComponentState,csAncestor)
else
Exclude(FCOmponentState,csAncestor);
if Assigned(FComponents) then
For Runner:=0 To FComponents.Count-1 do
TComponent(FComponents.Items[Runner]).SetAncestor(Value);
end;
Procedure TComponent.SetDesigning(Value: Boolean; SetChildren : Boolean = True);
Var Runner : Longint;
begin
If Value then
Include(FComponentState,csDesigning)
else
Exclude(FComponentState,csDesigning);
if Assigned(FComponents) and SetChildren then
For Runner:=0 To FComponents.Count - 1 do
TComponent(FComponents.items[Runner]).SetDesigning(Value);
end;
Procedure TComponent.SetDesignInstance(Value: Boolean);
begin
If Value then
Include(FComponentState,csDesignInstance)
else
Exclude(FComponentState,csDesignInstance);
end;
Procedure TComponent.SetInline(Value: Boolean);
begin
If Value then
Include(FComponentState,csInline)
else
Exclude(FComponentState,csInline);
end;
Procedure TComponent.SetName(const NewName: TComponentName);
begin
If FName=NewName then exit;
If (NewName<>'') and not IsValidIdent(NewName) then
Raise EComponentError.CreateFmt(SInvalidName,[NewName]);
If Assigned(FOwner) Then
FOwner.ValidateRename(Self,FName,NewName)
else
ValidateRename(Nil,FName,NewName);
SetReference(False);
ChangeName(NewName);
Setreference(True);
end;
Procedure TComponent.SetChildOrder(Child: TComponent; Order: Integer);
begin
// does nothing
end;
Procedure TComponent.SetParentComponent(Value: TComponent);
begin
// Does nothing
end;
Procedure TComponent.Updating;
begin
Include (FComponentState,csUpdating);
end;
Procedure TComponent.Updated;
begin
Exclude(FComponentState,csUpdating);
end;
class Procedure TComponent.UpdateRegistry(Register: Boolean; const ClassID, ProgID: string);
begin
// For compatibility only.
end;
Procedure TComponent.ValidateRename(AComponent: TComponent;
const CurName, NewName: string);
begin
//!! This contradicts the Delphi manual.
If (AComponent<>Nil) and (CompareText(CurName,NewName)<>0) and (AComponent.Owner = Self) and
(FindComponent(NewName)<>Nil) then
raise EComponentError.Createfmt(SDuplicateName,[newname]);
If (csDesigning in FComponentState) and (FOwner<>Nil) then
FOwner.ValidateRename(AComponent,Curname,Newname);
end;
Procedure TComponent.ValidateContainer(AComponent: TComponent);
begin
AComponent.ValidateInsert(Self);
end;
Procedure TComponent.ValidateInsert(AComponent: TComponent);
begin
// Does nothing.
end;
Procedure TComponent.WriteState(Writer: TWriter);
begin
Writer.WriteComponentData(Self);
end;
Constructor TComponent.Create(AOwner: TComponent);
begin
FComponentStyle:=[csInheritable];
If Assigned(AOwner) then AOwner.InsertComponent(Self);
end;
Destructor TComponent.Destroy;
Var
I : Integer;
C : TComponent;
begin
Destroying;
If Assigned(FFreeNotifies) then
begin
I:=FFreeNotifies.Count-1;
While (I>=0) do
begin
C:=TComponent(FFreeNotifies.Items[I]);
// Delete, so one component is not notified twice, if it is owned.
FFreeNotifies.Delete(I);
C.Notification (self,opRemove);
If (FFreeNotifies=Nil) then
I:=0
else if (I>FFreeNotifies.Count) then
I:=FFreeNotifies.Count;
dec(i);
end;
FreeAndNil(FFreeNotifies);
end;
DestroyComponents;
If FOwner<>Nil Then FOwner.RemoveComponent(Self);
inherited destroy;
end;
Procedure TComponent.BeforeDestruction;
begin
if not(csDestroying in FComponentstate) then
Destroying;
end;
Procedure TComponent.DestroyComponents;
Var acomponent: TComponent;
begin
While assigned(FComponents) do
begin
aComponent:=TComponent(FComponents.Last);
Remove(aComponent);
Acomponent.Destroy;
end;
end;
Procedure TComponent.Destroying;
Var Runner : longint;
begin
If csDestroying in FComponentstate Then Exit;
include (FComponentState,csDestroying);
If Assigned(FComponents) then
for Runner:=0 to FComponents.Count-1 do
TComponent(FComponents.Items[Runner]).Destroying;
end;
function TComponent.ExecuteAction(Action: TBasicAction): Boolean;
begin
if Action.HandlesTarget(Self) then
begin
Action.ExecuteTarget(Self);
Result := True;
end
else
Result := False;
end;
Function TComponent.FindComponent(const AName: string): TComponent;
Var I : longint;
begin
Result:=Nil;
If (AName='') or Not assigned(FComponents) then exit;
For i:=0 to FComponents.Count-1 do
if (CompareText(TComponent(FComponents[I]).Name,AName)=0) then
begin
Result:=TComponent(FComponents.Items[I]);
exit;
end;
end;
Procedure TComponent.FreeNotification(AComponent: TComponent);
begin
If (Owner<>Nil) and (AComponent=Owner) then exit;
If not (Assigned(FFreeNotifies)) then
FFreeNotifies:=TFpList.Create;
If FFreeNotifies.IndexOf(AComponent)=-1 then
begin
FFreeNotifies.Add(AComponent);
AComponent.FreeNotification (self);
end;
end;
procedure TComponent.RemoveFreeNotification(AComponent: TComponent);
begin
RemoveNotification(AComponent);
AComponent.RemoveNotification (self);
end;
Procedure TComponent.FreeOnRelease;
begin
if Assigned(VCLComObject) then
IVCLComObject(VCLComObject).FreeOnRelease;
end;
Function TComponent.GetParentComponent: TComponent;
begin
Result:=Nil;
end;
Function TComponent.HasParent: Boolean;
begin
Result:=False;
end;
Procedure TComponent.InsertComponent(AComponent: TComponent);
begin
AComponent.ValidateContainer(Self);
ValidateRename(AComponent,'',AComponent.FName);
Insert(AComponent);
AComponent.SetReference(True);
If csDesigning in FComponentState then
AComponent.SetDesigning(true);
Notification(AComponent,opInsert);
end;
Procedure TComponent.RemoveComponent(AComponent: TComponent);
begin
Notification(AComponent,opRemove);
AComponent.SetReference(False);
Remove(AComponent);
Acomponent.Setdesigning(False);
ValidateRename(AComponent,AComponent.FName,'');
end;
Function TComponent.SafeCallException(ExceptObject: TObject;
ExceptAddr: CodePointer): HResult;
begin
if Assigned(VCLComObject) then
Result := IVCLComObject(VCLComObject).SafeCallException(ExceptObject, ExceptAddr)
else
Result := inherited SafeCallException(ExceptObject, ExceptAddr);
end;
procedure TComponent.SetSubComponent(ASubComponent: Boolean);
begin
if ASubComponent then
Include(FComponentStyle, csSubComponent)
else
Exclude(FComponentStyle, csSubComponent);
end;
function TComponent.UpdateAction(Action: TBasicAction): Boolean;
begin
if Action.HandlesTarget(Self) then
begin
Action.UpdateTarget(Self);
Result := True;
end
else
Result := False;
end;
function TComponent.QueryInterface({$IFDEF FPC_HAS_CONSTREF}constref{$ELSE}const{$ENDIF} IID: TGUID; out Obj): HResult;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
begin
if Assigned(VCLComObject) then
Result := IVCLComObject(VCLComObject).QueryInterface(IID, Obj)
else
if GetInterface(IID, Obj) then
Result := S_OK
else
Result := E_NOINTERFACE;
end;
function TComponent._AddRef: Longint;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
begin
if Assigned(VCLComObject) then
Result := IVCLComObject(VCLComObject)._AddRef
else
Result := -1;
end;
function TComponent._Release: Longint;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
begin
if Assigned(VCLComObject) then
Result := IVCLComObject(VCLComObject)._Release
else
Result := -1;
end;
function TComponent.iicrGetComponent: TComponent;
begin
result:=self;
end;
function TComponent.GetTypeInfoCount(out Count: Integer): HResult; stdcall;
begin
if Assigned(VCLComObject) then
Result := IVCLComObject(VCLComObject).GetTypeInfoCount(Count)
else
Result := E_NOTIMPL;
end;
function TComponent.GetTypeInfo(Index, LocaleID: Integer; out TypeInfo): HResult; stdcall;
begin
if Assigned(VCLComObject) then
Result := IVCLComObject(VCLComObject).GetTypeInfo(Index, LocaleID, TypeInfo)
else
Result := E_NOTIMPL;
end;
function TComponent.GetIDsOfNames(const IID: TGUID; Names: Pointer; NameCount,
LocaleID: Integer; DispIDs: Pointer): HResult; stdcall;
begin
if Assigned(VCLComObject) then
Result := IVCLComObject(VCLComObject).GetIDsOfNames(IID, Names, NameCount, LocaleID, DispIDs)
else
Result := E_NOTIMPL;
end;
function TComponent.Invoke(DispID: Integer; const IID: TGUID;
LocaleID: Integer; Flags: Word; var Params; VarResult, ExcepInfo,
ArgErr: Pointer): HResult; stdcall;
begin
if Assigned(VCLComObject) then
Result := IVCLComObject(VCLComObject).Invoke(DispID, IID, LocaleID, Flags, Params,
VarResult, ExcepInfo, ArgErr)
else
Result := E_NOTIMPL;
end;
|