From f1cfea45dcf983e76fdcb6d0d4184c4e3449438f Mon Sep 17 00:00:00 2001
From: ask <ask@lazarus-ide.org>
Date: Wed, 22 Jun 2011 14:13:21 +0000
Subject: [PATCH] TAChart: Add combobox with legend items to the legend demo

git-svn-id: trunk@31335 -
---
 components/tachart/demo/legend/main.lfm | 19 ++++++++++--
 components/tachart/demo/legend/main.pas | 40 +++++++++++++++++++++++--
 2 files changed, 54 insertions(+), 5 deletions(-)

diff --git a/components/tachart/demo/legend/main.lfm b/components/tachart/demo/legend/main.lfm
index a7a26f52df..485b3bfabc 100644
--- a/components/tachart/demo/legend/main.lfm
+++ b/components/tachart/demo/legend/main.lfm
@@ -6,6 +6,8 @@ object Form1: TForm1
   Caption = 'Form1'
   ClientHeight = 390
   ClientWidth = 510
+  OnCreate = FormCreate
+  OnDestroy = FormDestroy
   Position = poScreenCenter
   LCLVersion = '0.9.31'
   object Chart1: TChart
@@ -15,12 +17,14 @@ object Form1: TForm1
     Width = 510
     AxisList = <    
       item
-        Title.LabelFont.Orientation = 900
         Visible = False
+        Minors = <>
+        Title.LabelFont.Orientation = 900
       end    
       item
-        Alignment = calBottom
         Visible = False
+        Alignment = calBottom
+        Minors = <>
       end>
     BackColor = clSkyBlue
     Foot.Brush.Color = clBtnFace
@@ -192,6 +196,17 @@ object Form1: TForm1
       TabOrder = 5
       Value = 4
     end
+    object cbSeries: TComboBox
+      Left = 102
+      Height = 19
+      Top = 60
+      Width = 148
+      ItemHeight = 16
+      OnDrawItem = cbSeriesDrawItem
+      ReadOnly = True
+      Style = csOwnerDrawFixed
+      TabOrder = 6
+    end
   end
   object RandomChartSource1: TRandomChartSource
     PointsNumber = 7
diff --git a/components/tachart/demo/legend/main.pas b/components/tachart/demo/legend/main.pas
index 92ba2a540f..3393b675f1 100644
--- a/components/tachart/demo/legend/main.pas
+++ b/components/tachart/demo/legend/main.pas
@@ -5,8 +5,8 @@ unit main;
 interface
 
 uses
-  ExtCtrls, Spin, StdCtrls, Forms, TAGraph, TASeries, TASources, Classes,
-  TALegend, TAFuncSeries, Graphics;
+  Contnrs, Controls, ExtCtrls, Graphics, Spin, StdCtrls, Forms,
+  TAGraph, TASeries, TASources, Classes, TALegend, TAFuncSeries;
 
 type
 
@@ -19,6 +19,7 @@ type
     Chart1LineSeries1: TLineSeries;
     Chart1PieSeries1: TPieSeries;
     cbUseSidebar: TCheckBox;
+    cbSeries: TComboBox;
     lblSpacing: TLabel;
     lblMarginX: TLabel;
     lblSymbolWidth: TLabel;
@@ -32,15 +33,21 @@ type
     seMarginX: TSpinEdit;
     seSymbolWidth: TSpinEdit;
     seMarginY: TSpinEdit;
+    procedure cbSeriesDrawItem(Control: TWinControl; Index: Integer;
+      ARect: TRect; State: TOwnerDrawState);
     procedure cbUseSidebarChange(Sender: TObject);
     procedure Chart1FuncSeries1Calculate(const AX: Double; out AY: Double);
     procedure Chart1FuncSeries1DrawLegend(
       ACanvas: TCanvas; const ARect: TRect; AIndex: Integer; var AText: String);
+    procedure FormCreate(Sender: TObject);
+    procedure FormDestroy(Sender: TObject);
     procedure rgAlignmentClick(Sender: TObject);
     procedure seMarginXChange(Sender: TObject);
     procedure seMarginYChange(Sender: TObject);
     procedure seSpacingChange(Sender: TObject);
     procedure seSymbolWidthChange(Sender: TObject);
+  private
+    FItems: TObjectList;
   end;
 
 var
@@ -51,10 +58,23 @@ implementation
 {$R *.lfm}
 
 uses
-  SysUtils;
+  SysUtils, TADrawerCanvas, TADrawUtils;
 
 { TForm1 }
 
+procedure TForm1.cbSeriesDrawItem(
+  Control: TWinControl; Index: Integer; ARect: TRect; State: TOwnerDrawState);
+var
+  id: IChartDrawer;
+  r: TRect;
+begin
+  id := TCanvasDrawer.Create(cbSeries.Canvas);
+  r := Bounds(
+    ARect.Left, ARect.Top, Chart1.Legend.SymbolWidth, cbSeries.ItemHeight);
+  id.Pen := Chart1.Legend.Frame;
+  (FItems[Index] as TLegendItem).Draw(id, r);
+end;
+
 procedure TForm1.cbUseSidebarChange(Sender: TObject);
 begin
   Chart1.Legend.UseSidebar := cbUseSidebar.Checked;
@@ -81,6 +101,20 @@ begin
       Round(Sin(x / w * 2 * Pi) * (ARect.Bottom - ARect.Top) / 2) + y0);
 end;
 
+procedure TForm1.FormCreate(Sender: TObject);
+var
+  i: Integer;
+begin
+  FItems := Chart1.GetLegendItems;
+  for i := 1 to FItems.Count do
+    cbSeries.AddItem('', nil);
+end;
+
+procedure TForm1.FormDestroy(Sender: TObject);
+begin
+  FreeAndNil(FItems);
+end;
+
 procedure TForm1.rgAlignmentClick(Sender: TObject);
 begin
   with Chart1.Legend do