TAChart: Group Legend-related properties into TChartSeriesLegend class. Update demo.

git-svn-id: trunk@27559 -

components/tachart/demo/legend/main.lfm

@@ -6,6 +6,7 @@ object Form1: TForm1
   Caption = 'Form1'
   ClientHeight = 361
   ClientWidth = 510
+  OnCreate = FormCreate
   Position = poScreenCenter
   LCLVersion = '0.9.29'
   object Chart1: TChart
@@ -59,7 +60,6 @@ object Form1: TForm1
       Extent.UseXMin = True
       Extent.UseXMax = True
       OnCalculate = Chart1FuncSeries1Calculate
-      OnDrawLegend = Chart1FuncSeries1DrawLegend
       Pen.Color = clPurple
       Pen.Width = 2
       Title = 'Function'

components/tachart/demo/legend/main.pas

@@ -34,6 +34,7 @@ type
     procedure cbUseSidebarChange(Sender: TObject);
     procedure Chart1FuncSeries1Calculate(const AX: Double; out AY: Double);
     procedure Chart1FuncSeries1DrawLegend(ACanvas: TCanvas; const ARect: TRect);
+    procedure FormCreate(Sender: TObject);
     procedure rgAlignmentClick(Sender: TObject);
     procedure seMarginXChange(Sender: TObject);
     procedure seMarginYChange(Sender: TObject);
@@ -75,6 +76,11 @@ begin
       Round(Sin(x / w * 2 * Pi) * (ARect.Bottom - ARect.Top) / 2) + y0);
 end;
 
+procedure TForm1.FormCreate(Sender: TObject);
+begin
+  Chart1FuncSeries1.Legend.OnDraw := @Chart1FuncSeries1DrawLegend;
+end;
+
 procedure TForm1.rgAlignmentClick(Sender: TObject);
 begin
   with Chart1.Legend do

components/tachart/tacustomseries.pas

@@ -36,18 +36,19 @@ type
   private
     FAxisIndexX: Integer;
     FAxisIndexY: Integer;
-    FOnDrawLegend: TLegendItemDrawEvent;
+    FLegend: TChartSeriesLegend;
     procedure SetAxisIndexX(AValue: Integer);
     procedure SetAxisIndexY(AValue: Integer);
-    procedure SetOnDrawLegend(AValue: TLegendItemDrawEvent);
+    procedure SetLegend(AValue: TChartSeriesLegend);
+    procedure SetShowInLegend(AValue: Boolean);
 
   protected
     procedure GetGraphBounds(var ABounds: TDoubleRect); override;
     procedure GetLegendItems(AItems: TChartLegendItems); virtual; abstract;
     procedure GetLegendItemsBasic(AItems: TChartLegendItems); override;
+    function GetShowInLegend: Boolean; override;
     procedure SetActive(AValue: Boolean); override;
     procedure SetDepth(AValue: TChartDistance); override;
-    procedure SetShowInLegend(AValue: Boolean); override;
     procedure SetZPosition(AValue: TChartDistance); override;
     procedure StyleChanged(Sender: TObject);
     procedure UpdateParentChart;
@@ -73,6 +74,7 @@ type
 
   public
     constructor Create(AOwner: TComponent); override;
+    destructor Destroy; override;
     function GetParentComponent: TComponent; override;
     function HasParent: Boolean; override;
 
@@ -81,8 +83,10 @@ type
     property AxisIndexY: Integer
       read FAxisIndexY write SetAxisIndexY default DEF_AXIS_INDEX;
 
-    property OnDrawLegend: TLegendItemDrawEvent
-      read FOnDrawLegend write SetOnDrawLegend;
+  published
+    property Legend: TChartSeriesLegend read FLegend write SetLegend;
+    property ShowInLegend: Boolean
+      read GetShowInLegend write SetShowInLegend default true; deprecated;
   end;
 
   TChartGetMarkEvent = procedure (
@@ -93,7 +97,6 @@ type
   TChartSeries = class(TCustomChartSeries)
   private
     FBuiltinSource: TCustomChartSource;
-    FLegendMultiplicity: TLegendMultiplicity;
     FListener: TListener;
     FMarks: TChartMarks;
     FOnGetMark: TChartGetMarkEvent;
@@ -103,7 +106,6 @@ type
 
     function GetSource: TCustomChartSource;
     function IsSourceStored: boolean;
-    procedure SetLegendMultiplicity(AValue: TLegendMultiplicity);
     procedure SetMarks(const AValue: TChartMarks);
     procedure SetOnGetMark(const AValue: TChartGetMarkEvent);
     procedure SetSource(AValue: TCustomChartSource);
@@ -158,14 +160,11 @@ type
       read GetSource write SetSource stored IsSourceStored;
   published
     property Active default true;
-    property LegendMultiplicity: TLegendMultiplicity
-      read FLegendMultiplicity write SetLegendMultiplicity default lmSingle;
     property Marks: TChartMarks read FMarks write SetMarks;
     property ShowInLegend;
     property Title;
     property ZPosition;
   published
-    property OnDrawLegend;
     property OnGetMark: TChartGetMarkEvent read FOnGetMark write SetOnGetMark;
   end;
 
@@ -203,7 +202,7 @@ type
 implementation
 
 uses
-  Math, Types;
+  Math, PropEdits, Types;
 
 { TCustomChartSeries }
 
@@ -229,9 +228,15 @@ constructor TCustomChartSeries.Create(AOwner: TComponent);
 begin
   inherited Create(AOwner);
   FActive := true;
-  FShowInLegend := true;
   FAxisIndexX := DEF_AXIS_INDEX;
   FAxisIndexY := DEF_AXIS_INDEX;
+  FLegend := TChartSeriesLegend.Create(FChart);
+end;
+
+destructor TCustomChartSeries.Destroy;
+begin
+  FreeAndNil(FLegend);
+  inherited Destroy;
 end;
 
 function TCustomChartSeries.GetAxisX: TChartAxis;
@@ -270,8 +275,8 @@ end;
 
 procedure TCustomChartSeries.GetLegendItemsBasic(AItems: TChartLegendItems);
 begin
-  if Assigned(FOnDrawLegend) then
-    AItems.Add(TLegendItemUserDrawn.Create(OnDrawLegend, Title))
+  if Assigned(Legend.OnDraw) then
+    AItems.Add(TLegendItemUserDrawn.Create(Legend.OnDraw, Title))
   else
     GetLegendItems(AItems);
 end;
@@ -281,6 +286,11 @@ begin
   Result := FChart;
 end;
 
+function TCustomChartSeries.GetShowInLegend: Boolean;
+begin
+  Result := Legend.Visible;
+end;
+
 function TCustomChartSeries.GraphToAxisX(AX: Double): Double;
 begin
   Result := TransformByAxis(FChart.AxisList, AxisIndexX).GraphToAxis(AX)
@@ -344,10 +354,10 @@ begin
     Move(Index, EnsureRange(AValue, 0, Count - 1));
 end;
 
-procedure TCustomChartSeries.SetOnDrawLegend(AValue: TLegendItemDrawEvent);
+procedure TCustomChartSeries.SetLegend(AValue: TChartSeriesLegend);
 begin
-  if FOnDrawLegend = AValue then exit;
-  FOnDrawLegend := AValue;
+  if FLegend = AValue then exit;
+  FLegend := AValue;
   UpdateParentChart;
 end;
 
@@ -359,9 +369,7 @@ end;
 
 procedure TCustomChartSeries.SetShowInLegend(AValue: Boolean);
 begin
-  if FShowInLegend = AValue then exit;
-  FShowInLegend := AValue;
-  UpdateParentChart;
+  Legend.Visible := AValue;
 end;
 
 procedure TCustomChartSeries.SetZPosition(AValue: TChartDistance);
@@ -599,13 +607,6 @@ begin
   Source[AIndex]^.Color := AColor;
 end;
 
-procedure TChartSeries.SetLegendMultiplicity(AValue: TLegendMultiplicity);
-begin
-  if FLegendMultiplicity = AValue then exit;
-  FLegendMultiplicity := AValue;
-  UpdateParentChart;
-end;
-
 procedure TChartSeries.SetMarks(const AValue: TChartMarks);
 begin
   if FMarks = AValue then exit;
@@ -818,5 +819,15 @@ begin
   end;
 end;
 
+procedure SkipObsoleteProperties;
+begin
+  RegisterPropertyEditor(
+    TypeInfo(Boolean), TCustomChartSeries,
+    'ShowInLegend', THiddenPropertyEditor);
+end;
+
+initialization
+  SkipObsoleteProperties;
+
 end.
 

components/tachart/tagraph.pas

@@ -48,7 +48,6 @@ type
     FActive: Boolean;
     FChart: TChart;
     FDepth: TChartDistance;
-    FShowInLegend: Boolean;
     FTitle: String;
     FZPosition: TChartDistance;
 
@@ -60,9 +59,9 @@ type
     procedure GetBounds(var ABounds: TDoubleRect); virtual; abstract;
     procedure GetGraphBounds(var ABounds: TDoubleRect); virtual; abstract;
     procedure GetLegendItemsBasic(AItems: TChartLegendItems); virtual; abstract;
+    function GetShowInLegend: Boolean; virtual; abstract;
     procedure SetActive(AValue: Boolean); virtual; abstract;
     procedure SetDepth(AValue: TChartDistance); virtual; abstract;
-    procedure SetShowInLegend(AValue: Boolean); virtual; abstract;
     procedure SetZPosition(AValue: TChartDistance); virtual; abstract;
     procedure UpdateMargins(ACanvas: TCanvas; var AMargins: TRect); virtual;
     procedure VisitSources(
@@ -89,8 +88,6 @@ type
     property Active: Boolean read FActive write SetActive default true;
     property Depth: TChartDistance read FDepth write SetDepth default 0;
     property ParentChart: TChart read FChart;
-    property ShowInLegend: Boolean
-      read FShowInLegend write SetShowInLegend default true;
     property Title: String read FTitle write FTitle;
     property ZPosition: TChartDistance read FZPosition write SetZPosition default 0;
   end;
@@ -509,7 +506,7 @@ begin
   try
     for i := 0 to SeriesCount - 1 do
       with Series[i] do
-        if Active and ShowInLegend then
+        if Active and GetShowInLegend then
           GetLegendItemsBasic(ALegendItems);
     ARect := Legend.Prepare(ACanvas, ALegendItems, FClipRect);
   except

components/tachart/talegend.pas

@@ -28,8 +28,6 @@ const
   DEF_LEGEND_SYMBOL_WIDTH = 20;
 
 type
-  TLegendMultiplicity = (lmSingle, lmPoint);
-
   { TLegendItem }
 
   TLegendItem = class
@@ -160,6 +158,27 @@ type
     property Visible default false;
   end;
 
+  TLegendMultiplicity = (lmSingle, lmPoint);
+
+  { TChartSeriesLegend }
+
+  TChartSeriesLegend = class(TChartElement)
+  private
+    FMultiplicity: TLegendMultiplicity;
+    FOnDraw: TLegendItemDrawEvent;
+    procedure SetMultiplicity(AValue: TLegendMultiplicity);
+    procedure SetOnDraw(AValue: TLegendItemDrawEvent);
+  public
+    constructor Create(AOwner: TCustomChart);
+  public
+    procedure Assign(Source: TPersistent); override;
+  published
+    property Multiplicity: TLegendMultiplicity
+      read FMultiplicity write SetMultiplicity default lmSingle;
+    property OnDraw: TLegendItemDrawEvent read FOnDraw write SetOnDraw;
+    property Visible default true;
+  end;
+
 implementation
 
 uses
@@ -450,8 +469,39 @@ begin
     TypeInfo(TChartDistance), TChartLegend, 'Margin', THiddenPropertyEditor);
 end;
 
-initialization
-  SkipObsoleteProperties;
+{ TChartSeriesLegend }
+
+procedure TChartSeriesLegend.Assign(Source: TPersistent);
+begin
+  if Source is TChartSeriesLegend then
+    with TChartSeriesLegend(Source) do begin
+      Self.FMultiplicity := FMultiplicity;
+      Self.FOnDraw := FOnDraw;
+      Self.FVisible := FVisible;
+    end;
+
+  inherited Assign(Source);
+end;
+
+constructor TChartSeriesLegend.Create(AOwner: TCustomChart);
+begin
+  inherited Create(AOwner);
+  FVisible := true;
+end;
+
+procedure TChartSeriesLegend.SetMultiplicity(AValue: TLegendMultiplicity);
+begin
+  if FMultiplicity = AValue then exit;
+  FMultiplicity := AValue;
+  StyleChanged(Self);
+end;
+
+procedure TChartSeriesLegend.SetOnDraw(AValue: TLegendItemDrawEvent);
+begin
+  if FOnDraw = AValue then exit;
+  FOnDraw := AValue;
+  StyleChanged(Self);
+end;
 
 end.
 

components/tachart/taseries.pas

@@ -248,7 +248,6 @@ type
     property Active default true;
     property LineStyle: TLineStyle
       read FLineStyle write SetLineStyle default lsHorizontal;
-    property OnDrawLegend;
     property Pen: TPen read FPen write SetPen;
     property Position: Double read FPosGraph write SetPos;
     property SeriesColor: TColor
@@ -298,7 +297,6 @@ type
     property AxisIndexY;
     property Extent: TChartExtent read FExtent write SetExtent;
     property OnCalculate: TFuncCalculateEvent read FOnCalculate write SetOnCalculate;
-    property OnDrawLegend;
     property Pen: TChartPen read FPen write SetPen;
     property ShowInLegend;
     property Step: TFuncSeriesStep read FStep write SetStep default 2;
@@ -328,7 +326,6 @@ type
     property ZPosition;
   published
     property OnDraw: TSeriesDrawEvent read FOnDraw write SetOnDraw;
-    property OnDrawLegend;
     property OnGetBounds: TSeriesGetBoundsEvent
       read FOnGetBounds write SetOnGetBounds;
   end;
@@ -952,7 +949,7 @@ procedure TPieSeries.GetLegendItems(AItems: TChartLegendItems);
 var
   i: Integer;
 begin
-  case LegendMultiplicity of
+  case Legend.Multiplicity of
     lmSingle:
       AItems.Add(TLegendItemColorRect.Create(SliceColor(0), Title));
     lmPoint: