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