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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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132 lines
3.2 KiB
ObjectPascal
132 lines
3.2 KiB
ObjectPascal
{
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*****************************************************************************
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See the file COPYING.modifiedLGPL.txt, included in this distribution,
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for details about the license.
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*****************************************************************************
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Authors: Alexander Klenin
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}
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unit TAEnumerators;
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{$H+}
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interface
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uses
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Classes, Types,
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TACustomSeries, TAGraph;
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type
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TBasicFilteredChartSeriesEnumeratorFactory = class
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strict protected
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FChart: TChart;
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FFilter: TBooleanDynArray;
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public
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constructor Create(AChart: TChart; AFilter: TBooleanDynArray = nil);
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property Chart: TChart read FChart;
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property Filter: TBooleanDynArray read FFilter;
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end;
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{$IFNDEF fpdoc} // Workaround for issue #18549.
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generic TFilteredChartSeriesEnumerator<_T> = class
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{$ELSE}
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TFilteredChartSeriesEnumerator = class
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{$ENDIF}
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strict private
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FFactory: TBasicFilteredChartSeriesEnumeratorFactory;
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FPosition: Integer;
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public
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constructor Create(AFactory: TBasicFilteredChartSeriesEnumeratorFactory);
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destructor Destroy; override;
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function GetCurrent: _T;
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function MoveNext: Boolean;
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property Current: _T read GetCurrent;
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end;
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{$IFNDEF fpdoc} // Workaround for issue #18549.
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generic TFilteredChartSeriesEnumeratorFactory<_T> = class(
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TBasicFilteredChartSeriesEnumeratorFactory)
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{$ELSE}
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TFilteredChartSeriesEnumeratorFactory = class(
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TBasicFilteredChartSeriesEnumeratorFactory)
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{$ENDIF}
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public
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type
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TEnum = specialize TFilteredChartSeriesEnumerator<_T>;
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function GetEnumerator: TEnum;
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end;
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{$IFNDEF fpdoc} // Workaround for issue #18549.
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TFilteredCustomChartSeriesEnumeratorFactory =
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specialize TFilteredChartSeriesEnumeratorFactory<TCustomChartSeries>;
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{$ENDIF}
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function CustomSeries(
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AChart: TChart; AFilter: TBooleanDynArray = nil
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): TFilteredCustomChartSeriesEnumeratorFactory;
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implementation
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uses
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SysUtils;
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function CustomSeries(
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AChart: TChart; AFilter: TBooleanDynArray):
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TFilteredCustomChartSeriesEnumeratorFactory;
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begin
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Result := TFilteredCustomChartSeriesEnumeratorFactory.Create(AChart, AFilter);
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end;
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{ TBasicFilteredChartSeriesEnumeratorFactory }
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constructor TBasicFilteredChartSeriesEnumeratorFactory.Create(
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AChart: TChart; AFilter: TBooleanDynArray);
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begin
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FChart := AChart;
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FFilter := AFilter;
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end;
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{ TFilteredChartSeriesEnumerator }
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constructor TFilteredChartSeriesEnumerator.Create(
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AFactory: TBasicFilteredChartSeriesEnumeratorFactory);
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begin
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FFactory := AFactory;
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FPosition := -1;
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end;
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destructor TFilteredChartSeriesEnumerator.Destroy;
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begin
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FreeAndNil(FFactory);
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inherited;
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end;
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function TFilteredChartSeriesEnumerator.GetCurrent: _T;
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begin
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Result := _T(FFactory.Chart.Series.List[FPosition]);
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end;
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function TFilteredChartSeriesEnumerator.MoveNext: Boolean;
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begin
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Result := false;
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repeat
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FPosition += 1;
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if FPosition >= FFactory.Chart.SeriesCount then exit;
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Result :=
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(TBasicChartSeries(FFactory.Chart.Series.List[FPosition]).InheritsFrom(_T)) and
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((FPosition > High(FFactory.Filter)) or FFactory.Filter[FPosition]);
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until Result;
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end;
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{ TFilteredChartSeriesEnumeratorFactory }
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function TFilteredChartSeriesEnumeratorFactory.GetEnumerator: TEnum;
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begin
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Result := TEnum.Create(Self);
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end;
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end.
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