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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.
**********************************************************************}
{****************************************************************************}
{* TBasicActionLink *}
{****************************************************************************}
constructor TBasicActionLink.Create(AClient: TObject);
begin
inherited Create;
AssignClient(AClient);
end;
procedure TBasicActionLink.AssignClient(AClient: TObject);
begin
end;
destructor TBasicActionLink.Destroy;
begin
if FAction <> nil then
FAction.UnRegisterChanges(Self);
inherited Destroy;
end;
procedure TBasicActionLink.Change;
begin
if Assigned(OnChange) then
OnChange(FAction);
end;
function TBasicActionLink.Execute(AComponent: TComponent): Boolean;
begin
FAction.ActionComponent := AComponent;
try
Result := FAction.Execute;
finally
if FAction <> nil then
FAction.ActionComponent := nil;
end;
end;
procedure TBasicActionLink.SetAction(Value: TBasicAction);
begin
if Value <> FAction then
begin
if FAction <> nil then FAction.UnRegisterChanges(Self);
FAction := Value;
if Value <> nil then Value.RegisterChanges(Self);
end;
end;
function TBasicActionLink.IsOnExecuteLinked: Boolean;
begin
Result := True;
end;
procedure TBasicActionLink.SetOnExecute(Value: TNotifyEvent);
begin
end;
function TBasicActionLink.Update: Boolean;
begin
Result := FAction.Update;
end;
{****************************************************************************}
{* TBasicAction *}
{****************************************************************************}
constructor TBasicAction.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FClients := TFpList.Create;
end;
destructor TBasicAction.Destroy;
begin
inherited Destroy;
while FClients.Count > 0 do
UnRegisterChanges(TBasicActionLink(FClients.Last));
FClients.Free;
end;
function TBasicAction.HandlesTarget(Target: TObject): Boolean;
begin
Result := False;
end;
procedure TBasicAction.ExecuteTarget(Target: TObject);
begin
end;
procedure TBasicAction.UpdateTarget(Target: TObject);
begin
end;
function TBasicAction.Execute: Boolean;
begin
if Assigned(FOnExecute) then
begin
FOnExecute(Self);
Result := True;
end
else
Result := False;
end;
function TBasicAction.Update: Boolean;
begin
if Assigned(FOnUpdate) then
begin
FOnUpdate(Self);
Result := True;
end
else
Result := False;
end;
procedure TBasicAction.SetOnExecute(Value: TNotifyEvent);
var
I: Integer;
begin
if (TMethod(Value).Code <> TMethod(OnExecute).Code) or
(TMethod(Value).Data <> TMethod(OnExecute).Data) then
begin
for I := 0 to FClients.Count - 1 do
TBasicActionLink(FClients[I]).SetOnExecute(Value);
FOnExecute := Value;
Change;
end;
end;
procedure TBasicAction.Change;
begin
if Assigned(FOnChange) then
FOnChange(Self);
end;
procedure TBasicAction.RegisterChanges(Value: TBasicActionLink);
begin
Value.FAction := Self;
FClients.Add(Value);
end;
procedure TBasicAction.UnRegisterChanges(Value: TBasicActionLink);
var
I: Integer;
begin
for I := 0 to FClients.Count - 1 do
if TBasicActionLink(FClients[I]) = Value then
begin
Value.FAction := nil;
FClients.Delete(I);
break;
end;
end;
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