TAChart: Auto-update TChartLegendPanel

git-svn-id: trunk@27783 -

components/tachart/tacustomseries.pas

@@ -410,7 +410,8 @@ end;
 
 procedure TCustomChartSeries.UpdateParentChart;
 begin
-  if ParentChart <> nil then ParentChart.Invalidate;
+  if ParentChart <> nil then
+    ParentChart.StyleChanged(Self);
 end;
 
 { TChartSeries }

components/tachart/tagraph.pas

@@ -159,6 +159,7 @@ type
 
   private
     FActiveToolIndex: Integer;
+    FBroadcaster: TBroadcaster;
     FBuiltinToolset: TBasicChartToolset;
     FClipRect: TRect;
     FCurrentExtent: TDoubleRect;
@@ -215,8 +216,6 @@ type
     procedure PrepareLegend(
       ACanvas: TCanvas; out ALegendItems: TChartLegendItems;
       var AClipRect: TRect; out ALegendRect: TRect);
-    procedure StyleChanged(Sender: TObject);
-
   public
     constructor Create(AOwner: TComponent); override;
     destructor Destroy; override;
@@ -242,6 +241,7 @@ type
     procedure SaveToBitmapFile(const AFileName: String); inline;
     procedure SaveToFile(AClass: TRasterImageClass; const AFileName: String);
     function SaveToImage(AClass: TRasterImageClass): TRasterImage;
+    procedure StyleChanged(Sender: TObject); override;
     procedure ZoomFull; override;
   public // Coordinate conversion
     function GraphToImage(const AGraphPoint: TDoublePoint): TPoint;
@@ -253,6 +253,7 @@ type
 
   public
     property ActiveToolIndex: Integer read FActiveToolIndex;
+    property Broadcaster: TBroadcaster read FBroadcaster;
     property ChartHeight: Integer read GetChartHeight;
     property ChartWidth: Integer read GetChartWidth;
     property ClipRect: TRect read FClipRect;
@@ -371,6 +372,7 @@ const
 begin
   inherited Create(AOwner);
 
+  FBroadcaster := TBroadcaster.Create;
   FAllowZoom := true;
   FAxisVisible := true;
 
@@ -428,6 +430,7 @@ begin
   FreeAndNil(FExtent);
   FreeAndNil(FMargins);
   FreeAndNil(FBuiltinToolset);
+  FreeAndNil(FBroadcaster);
 
   DrawData.DeleteByChart(Self);
   inherited;
@@ -456,6 +459,7 @@ end;
 procedure TChart.StyleChanged(Sender: TObject);
 begin
   Invalidate;
+  Broadcaster.Broadcast(Sender);
 end;
 
 procedure TChart.Paint;

components/tachart/talegendpanel.pas

@@ -20,7 +20,7 @@ unit TALegendPanel;
 interface
 
 uses
-  Classes, Controls, TAGraph;
+  Classes, Controls, TAChartUtils, TAGraph;
 
 type
 
@@ -29,9 +29,12 @@ type
   TChartLegendPanel = class(TCustomControl)
   private
     FChart: TChart;
-    procedure SetChart(const AValue: TChart);
+    FListener: TListener;
+    procedure ChartChanged(Sender: TObject);
+    procedure SetChart(AValue: TChart);
   public
     constructor Create(AOwner: TComponent); override;
+    destructor Destroy; override;
     procedure Paint; override;
   published
     property Chart: TChart read FChart write SetChart;
@@ -44,7 +47,7 @@ procedure Register;
 implementation
 
 uses
-  TAChartUtils;
+  SysUtils;
 
 procedure Register;
 begin
@@ -53,26 +56,43 @@ end;
 
 { TChartLegendPanel }
 
+procedure TChartLegendPanel.ChartChanged(Sender: TObject);
+begin
+  // TODO: Do not auto-update on chart zooming/scrolling.
+  Invalidate;
+end;
+
 constructor TChartLegendPanel.Create(AOwner: TComponent);
 begin
   inherited Create(AOwner);
+  FListener := TListener.Create(@FChart, @ChartChanged);
   Width := 40;
   Height := 20;
 end;
 
+destructor TChartLegendPanel.Destroy;
+begin
+  FreeAndNil(FListener);
+  inherited Destroy;
+end;
+
 procedure TChartLegendPanel.Paint;
 var
   r: TRect;
 begin
   if Chart = nil then exit;
-  r := Canvas.ClipRect;
+  r := Rect(0, 0, Width, Height);
   Chart.DrawLegendOn(Canvas, r);
 end;
 
-procedure TChartLegendPanel.SetChart(const AValue: TChart);
+procedure TChartLegendPanel.SetChart(AValue: TChart);
 begin
   if FChart = AValue then exit;
+  if FListener.IsListening then
+    FChart.Broadcaster.Unsubscribe(FListener);
   FChart := AValue;
+  if FChart <> nil then
+    FChart.Broadcaster.Subscribe(FListener);
   Invalidate;
 end;
 

components/tachart/tatypes.pas

@@ -42,6 +42,7 @@ type
   TCustomChart = class(TCustomControl)
   public
     procedure ZoomFull; virtual; abstract;
+    procedure StyleChanged(Sender: TObject); virtual; abstract;
   end;
 
   { TChartPen }
@@ -352,7 +353,7 @@ end;
 procedure TChartElement.StyleChanged(Sender: TObject);
 begin
   if FOwner <> nil then
-    FOwner.Invalidate;
+    FOwner.StyleChanged(Sender);
 end;
 
 { TChartTitle }