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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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96 lines
1.9 KiB
ObjectPascal
96 lines
1.9 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 TALegendPanel;
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{$H+}
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interface
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uses
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Classes, Controls, TAChartUtils, TAGraph;
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type
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{ TChartLegendPanel }
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TChartLegendPanel = class(TCustomControl)
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private
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FChart: TChart;
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FListener: TListener;
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procedure ChartChanged(ASender: TObject);
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procedure SetChart(AValue: TChart);
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public
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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procedure Paint; override;
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published
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property Chart: TChart read FChart write SetChart;
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published
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property Align;
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end;
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procedure Register;
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implementation
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uses
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SysUtils;
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procedure Register;
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begin
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RegisterComponents(CHART_COMPONENT_IDE_PAGE, [TChartLegendPanel]);
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end;
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{ TChartLegendPanel }
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procedure TChartLegendPanel.ChartChanged(ASender: TObject);
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begin
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// TODO: Do not auto-update on chart zooming/scrolling.
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Unused(ASender);
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Invalidate;
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end;
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constructor TChartLegendPanel.Create(AOwner: TComponent);
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begin
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inherited Create(AOwner);
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FListener := TListener.Create(@FChart, @ChartChanged);
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Width := 40;
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Height := 20;
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end;
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destructor TChartLegendPanel.Destroy;
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begin
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FreeAndNil(FListener);
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inherited Destroy;
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end;
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procedure TChartLegendPanel.Paint;
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var
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r: TRect;
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begin
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if Chart = nil then exit;
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r := Rect(0, 0, Width, Height);
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Chart.DrawLegendOn(Canvas, r);
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end;
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procedure TChartLegendPanel.SetChart(AValue: TChart);
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begin
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if FChart = AValue then exit;
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if FListener.IsListening then
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FChart.Broadcaster.Unsubscribe(FListener);
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FChart := AValue;
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if FChart <> nil then
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FChart.Broadcaster.Subscribe(FListener);
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Invalidate;
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end;
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end.
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