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TAChart: Add methods to exchange and sort items of the TChartListbox.

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git-svn-id: trunk@64447 -
This commit is contained in:
wp 2021-01-30 22:55:37 +00:00
parent bd85539715
commit a5b4e02b77
1 changed files with 54 additions and 2 deletions
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56
components/tachart/tachartlistbox.pas
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@ -25,7 +25,7 @@ unit TAChartListbox;
{$IFDEF DARWIN}
{$DEFINE USE_BITMAPS}
{$ENDIF}
{$WARN 6058 off : Call to subroutine "$1" marked as inline is not inlined}
interface
uses
@ -97,15 +97,17 @@ type
procedure ClickedSeriesIcon(AIndex: Integer); virtual;
function CreateLegendItems: TChartLegendItems;
procedure Notification(AComponent: TComponent; AOperation: TOperation); override;
procedure Populate;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure ExchangeSeries(AIndex1, AIndex2: Integer);
function FindSeriesIndex(ASeries: TCustomChartSeries): Integer;
procedure MeasureItem(AIndex: Integer; var AHeight: Integer); override;
procedure Populate;
procedure RemoveSeries(ASeries: TCustomChartSeries);
procedure SeriesChanged(ASender: TObject);
procedure Sort(Descending: Boolean = false);
property Checked[AIndex: Integer]: Boolean read GetChecked write SetChecked;
property Series[AIndex: Integer]: TCustomChartSeries read GetSeries;
@ -435,6 +437,20 @@ begin
end;
end;
{ Exchanges the series at the specified listbox indices . }
procedure TChartListbox.ExchangeSeries(AIndex1, AIndex2: Integer);
var
serIndex1, serIndex2: Integer;
begin
FChart.DisableRedrawing;
serIndex1 := Series[AIndex1].Index;
serIndex2 := Series[AIndex2].Index;
Series[AIndex1].Index := serIndex2;
Series[AIndex2].Index := serIndex1;
Populate;
FChart.EnableRedrawing;
end;
function TChartListbox.FindSeriesIndex(ASeries: TCustomChartSeries): Integer;
{ searches the internal legend items list for the specified series }
begin
@ -693,6 +709,42 @@ begin
Invalidate;
end;
{ Sorts the listbox by the series names in ascending or descending order.
Note that only series with Legend.Order = -1 are considered, i.e.
series having a given legend position are ignored. }
procedure TChartListbox.Sort(Descending: Boolean = false);
var
list: TStringList;
ser: TCustomChartSeries;
i: Integer;
selSeries: TCustomChartSeries = nil;
begin
if ItemIndex > -1 then
selSeries := Series[ItemIndex];
list := TStringList.Create;
try
for ser in CustomSeries(FChart) do
list.AddObject(ser.Title, ser);
list.Sort;
FChart.DisableRedrawing;
try
for i := 0 to list.Count-1 do
begin
ser := TCustomChartSeries(list.Objects[i]);
ser.Index := IfThen(Descending, list.Count - 1 - i, i);
end;
Populate;
if selSeries <> nil then ItemIndex := FindSeriesIndex(selSeries);
finally
FChart.EnableRedrawing;
end;
finally
list.Free;
end
end;
procedure Register;
begin
RegisterComponents(CHART_COMPONENT_IDE_PAGE, [TChartListbox]);