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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Task.Controllable;
interface
uses
Boolean,
Integer,
Progress,
Task,
Thread.Lock;
type
TTaskController = class(TObject)
private
Lock: TThreadLock;
private
FProgress: TProgress;
FStopped: TBoolean;
function GetProgress(): TProgress;
function GetAtEnd(): TBoolean;
public
constructor Create(); virtual;
destructor Destroy(); override;
procedure SetTotal(const Value: TInteger);
function Advance(const Value: TInteger): TInteger;
procedure Stop();
property AtEnd: TBoolean read GetAtEnd;
property Progress: TProgress read GetProgress;
end;
TControllableTask = class(TTask)
private
FController: TTaskController;
public
constructor Create(); override;
destructor Destroy(); override;
function GetProgress(): TProgress; virtual;
property Controller: TTaskController read FController;
end;
implementation
{ TControllableTask }
constructor TControllableTask.Create();
begin
inherited Create();
FController := TTaskController.Create();
end;
destructor TControllableTask.Destroy();
begin
Controller.Free();
inherited Destroy();
end;
function TControllableTask.GetProgress(): TProgress;
begin
Result := Controller.Progress;
end;
{ TTaskController }
function TTaskController.Advance(const Value: TInteger): TInteger;
begin
Lock.Acquire();
try
Inc(FProgress.Step, Value);
Result := FProgress.Step;
finally
Lock.Release();
end;
end;
constructor TTaskController.Create();
begin
inherited Create();
Lock := TThreadLock.Create();
end;
destructor TTaskController.Destroy();
begin
Lock.Free();
inherited Destroy();
end;
function TTaskController.GetAtEnd(): TBoolean;
begin
Lock.Acquire();
try
Result := FStopped or (FProgress.Step >= FProgress.Total);
finally
Lock.Release();
end;
end;
function TTaskController.GetProgress(): TProgress;
begin
Lock.Acquire();
try
Result := FProgress;
finally
Lock.Release();
end;
end;
procedure TTaskController.SetTotal(const Value: TInteger);
begin
Lock.Acquire();
try
FProgress.Total := Value;
finally
Lock.Release();
end;
end;
procedure TTaskController.Stop();
begin
Lock.Acquire();
try
FStopped := True;
finally
Lock.Release();
end;
end;
end.
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