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TAChart: Auto-update TChartLegendPanel

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git-svn-id: trunk@27783 -
This commit is contained in:
ask 2010-10-21 09:05:34 +00:00
parent e3573e3e88
commit 53f0743f12
4 changed files with 35 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
components/tachart/tacustomseries.pas
View File

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

8
components/tachart/tagraph.pas
View File

@ -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;

30
components/tachart/talegendpanel.pas
View File

@ -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;

3
components/tachart/tatypes.pas
View File

@ -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 }