Flex自定义组件开发 - jackyWHJ

一般情况下需要组件重写都是由于以下2个原因： 
1、在FLEX已有组件无法满足业务需求，或是需要更改其可视化外观等特性时，直接进行继承扩展。 
2、为了模块化设计或进一步重用，需要对FLEX组件进行组合。 
而Flex组件开发有2种方式： AS方式和MXML方式。对于上述第一个原因我一般采用AS方式，通过继承 UIComponent来开发，而针对原因2我一般使用的是 MXML方式。本文主要讲的是AS开发方式。 
重写一个组件依次调用的方法 ： 
1）Constructor构造方法，初始化属性，默认值 在这个方法中使用最好。 
2）createChildren() 创建子对象，在组件中添加子对象。是使用addChild方法添加子对象  
3）commitProperties 用在处理属性值和更新。（多个属性值更新后统一处理入口和单值多次修改后处理入口）  
4）measure()设置组件的默认大小（以便Flex布局管理器能正确知道该组件的大小，给其分配适当空间）  
5）updateDisplayList()用来重绘组件，子对象布局逻辑等  
我们通过这样一个例子来讲解。

 
首先是 Constructor方法：

public function MultilayerHorizontalBarChart()
{super();
}

由于该例不需要在构造初始化属性（一般简单数据类型在定义的时候就已经赋值），所以构造方法没内容；

接着是 createChildren方法：

　　　　override protected function createChildren():void
{super.createChildren();
if (_mXis == null)
{
_mXis = new Group();
addChild(_mXis);
}
if (_mYis == null)
{	
_mYis = new Group();
addChild(_mYis);
} 
if (_mHBarIDLable == null )
{
_mHBarIDLable = new Group();
addChild(_mHBarIDLable);
}
if (_gridLines == null)
{
_gridLines = new Group();
addChild(_gridLines);
}
if (_mMainHDraw == null)
{	
_mMainHDraw = new Group();
addChild(_mMainHDraw);	
} 
if (_mEventGroup == null){
_mEventGroup = new Group();
addChild(_mEventGroup);			
 
_mEventGroup.addEventListener(MouseEvent.MOUSE_OUT, deleDataHandler);
_mEventGroup.addEventListener(MouseEvent.MOUSE_MOVE,showDataHandler);

} 
if (mFloatIsShow)
{
if (floatDataPanel == null)
{
floatDataPanel = new BorderContainer();
floatInerPanel = new BorderContainer();
floatDataPanel.setStyle("cornerRadius",15);
floatInerPanel.setStyle("cornerRadius",15);
var vs:SolidColor = new SolidColor();
vs.color = 0x6A726B;
vs.alpha = 0.3;
floatDataPanel.backgroundFill = vs;
floatDataPanel.visible = false;
_mEventGroup.addElement(floatDataPanel);
}
}
}

这里涉及到组件 子对象的划分，本例子中，具有的子对象有 _mXis X轴容器对象，_mYis Y轴容器对象， _mHBarIDLable 柱子标签容器对象（最上方月份提示那个）， _gridLines 网格容器对象， _mMainHDraw 主画布对象（用来画柱状图的容器）， _mEventGroup 鼠标事件监听容器对象， floatDataPanel、 floatInerPanel 是显示数据的浮动框容器对象 。在该方法里我们初始化这些子对象并把他们添加到组件容器中。

接下来是 commitProperties 用在处理属性值和更新，本例子中这些事情都在updateDisplayList处理，重点掌握 updateDisplayList方法的重写。

接着是 measure方法的重写（本例中，重绘的时候都会重新调整自对象的位置和大小，所以该方法的重写也可以省略）：

　　　　override protected function measure():void
        {super.measure();
            measuredMinHeight = measuredHeight = DEFAULT_HEIGHT;
            measuredMinWidth = measuredWidth = DEFAULT_WIDTH;
        }

接下来是本例的重头戏， updateDisplayList方法的重写：

　　　　override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{if (_isReflash)
{
super.updateDisplayList(unscaledWidth, unscaledHeight);
if (dataProvider == null)
{
return;
}
for (var i:int = 0; i < dataProvider.ColumnName.length; i++)
{	
//如果存在空数据就设定标识退出循环
if (null == dataProvider.Data[dataProvider.ColumnName[i]])
{
_checkData = false;
break;
}
}
if (_checkData)
{
drawLayouts(unscaledWidth,unscaledHeight);
drawXAxis();
drawYAxis();
drawGrid();
legendHBarLine();
drawHBar();			
}
_isReflash = false;
}
}

该方法中，先对数据源进行检验，只有但数据源不为空并且是新的数据源才进行重绘，否则不作处理。重绘做的事情主要是： drawLayouts(unscaledWidth,unscaledHeight)子对象布局，子对象位置和大小的确定; drawXAxis()重绘X轴容器自对象; drawYAxis()重绘Y轴容器子对象;legendHBarLine()重绘数据标签提示自对象; drawGrid()、 drawHBar()主画布区域子对象重绘，画网格和柱状图; 

  drawLayouts方法：    

　　　　protected function drawLayouts(pW:Number, pH:Number):void
{this._mXis.setActualSize(pW - this.mYAxisWidth, this.mXAxisHeight);
_mXis.move(this.mYAxisWidth, pH - this.mXAxisHeight);
this._mYis.setActualSize(this.mYAxisWidth, pH - this.mXAxisHeight - this.mHBarIDLableHeight);
this._mYis.move(0,this.mHBarIDLableHeight);

//X轴标签位置
this._mHBarIDLable.setActualSize(pW - this.mYAxisWidth, this.mHBarIDLableHeight);
this._mHBarIDLable.move(this.mYAxisWidth, -10);

this._gridLines.setActualSize(pW - this.mYAxisWidth, pH - this.mXAxisHeight - this.mHBarIDLableHeight);
this._gridLines.move(this.mYAxisWidth, this.mHBarIDLableHeight);

this._mMainHDraw.setActualSize(pW - this.mYAxisWidth, pH - this.mXAxisHeight - this.mHBarIDLableHeight);
this._mMainHDraw.move(this.mYAxisWidth, this.mHBarIDLableHeight);

this._mEventGroup.setActualSize(pW - this.mYAxisWidth,  pH - this.mXAxisHeight - this.mHBarIDLableHeight);
this._mEventGroup.move(this.mYAxisWidth, this.mHBarIDLableHeight);
}

确定各子对象的宽高和x,y坐标，对整个组件容器区域进行划分。

drawXAxis方法：

　　　　protected function drawXAxis():void
{var _mXMaxValue:Number =100;
// TODO Auto Generated method stub

var vGroup:Group = this._mXis;
var vG:Graphics = vGroup.graphics;

vGroup.removeAllElements();
vG.clear();
vG.lineStyle(1, 0x000000,0.8);
vG.moveTo(0, 0);
vG.lineTo(vGroup.width,0);
_mXCachedTicks = new Vector.<Number>();
_mXCacheValueTicks = new Vector.<Number>();
//将X轴分成xbisectNum等份 默认为10
var vCount:int = xBisectNum;
var vGap:Number = vGroup.width / vCount;
var vGapValue:Number = _mXMaxValue / vCount;
var vNum:Number;
var vX:Number
for(var i:int=0; i <= vCount; i++){
vX = i * vGap;
vG.moveTo(vX, 0);
vG.lineTo(vX,6);
_mXCachedTicks.push(vX);

var vTextField:Text = new Text();
vNum = i*vGapValue;
vTextField.text = vNum.toString() + "%";
var vTlm:TextLineMetrics = measureText(vTextField.text);
vTextField.move( vX - vTlm.width / 2, 10);
vGroup.addElement(vTextField);
}
vGroup = null;
vG = null;
}

画坐标轴并添加上刻度值数据标签。

drawYAxis方法：

　　　　protected function drawYAxis():void
{var vGroup:Group = this._mYis;
var vG:Graphics = vGroup.graphics;
vGroup.removeAllElements();
vG.clear();
vG.lineStyle(1, 0x000000,0.8);
vG.moveTo(vGroup.width, 0);
vG.lineTo(vGroup.width, vGroup.height);
_mYCachedTicks = new Vector.<Number>();
//Y轴数据的个数
var vCount:int = this.dataProvider.RowCount;
var vGap:Number = vGroup.height / vCount;
//存储Y轴刻度高度，供之后画图使用
this._mYGap = vGap;

vG.moveTo(vGroup.width - 6, 0);
vG.lineTo(vGroup.width, 0);

for (var i:int = 0; i <= vCount; i++) {
var vY:Number = (i) * vGap;
vG.moveTo(vGroup.width-6, vY);
vG.lineTo(vGroup.width, vY);
_mYCachedTicks.push(vY);
var vTextField:Label = new Label();
if (i < vCount) 
{
//把Y轴的显示的标签加上
vTextField.text = this.dataProvider.Data[categoryField][i];
var vTlm:TextLineMetrics = measureText(vTextField.text);
vTextField.move(vGroup.width - vTlm.width - 20, vY + vGap/2 - vTlm.height / 2);
vGroup.addElement(vTextField);
}
}
vGroup = null;
vG = null;
}

画Y轴坐标轴并添加数据指标标签。

legendHBarLine方法：

　　　　protected function legendHBarLine():void
{var vGroup:Group = this._mHBarIDLable;
var vIDLableLen:Number = vGroup.width/this._mHBarCenNum;
var vGap:Number = vIDLableLen / 6;
var vHLineLen:Number = vGap*0.6;

var vHY:Number = vGroup.height /2;
var vG:Graphics =vGroup.graphics;
_mHBarIDLable.removeAllElements();
vG.clear();
var vLBuffef:Number = 0;
for(var i:int=0; i < this._mHBarCenNum; i++)
{
var vName:Label = new Label(); 
vG.lineStyle(0.2, this.mHBarColorArray[i%this.mHBarColorArray.length]);			//对颜色数组取余可防止颜色数组不足时index越界
vG.beginFill(mHBarColorArray[i]);
vG.drawRect(vLBuffef,vHY,vHLineLen,vHLineLen);
vG.endFill();
vName.text = this.dataProvider.ColumnName[i+1];
vName.x = vLBuffef + vHLineLen;
vName.y = vHY/2;
_mHBarIDLable.addElement(vName);
vLBuffef += vIDLableLen;
}
vGroup = null;
vG = null;
}

容器内顶部画添加数据提示标签。

drawGrid方法：

　　　　protected function drawGrid():void 
{
var vGroup:Group = _gridLines;
var vG:Graphics = vGroup.graphics;
vG.clear();
var vColor:uint = 0xBFBFBF;
var vAlpha:Number = 0.3;
vG.lineStyle(1, vColor, vAlpha);
var vLen:Number;
var vPoint:Point;
var i:int;
var pos:int;

//画横线
if (_mYCachedTicks && _mYCachedTicks.length > 0) 
{
vLen = vGroup.width / 10;
var vgHeight:Number;
for (i = 0; i < _mYCachedTicks.length - 1; i++) 
{
vgHeight = _mYCachedTicks[i];
for (pos = 0; pos < vLen; pos++)
{
vG.moveTo(pos * 10, vgHeight);
vG.lineTo(pos * 10 + 6, vgHeight);
}
}
}

//画竖线
if (_mXCachedTicks && _mXCachedTicks.length > 0) {
vLen = vGroup.height / 10;
var vMax:int = _mXCachedTicks.length;
for (i = 1; i < vMax; i++) {
var vWidth:Number = _mXCachedTicks[i];
for (pos = 0; pos < vLen; pos++) {
vG.moveTo(vWidth, pos * 10);
vG.lineTo(vWidth, pos * 10 + 6);
}
}
}
}

画网格，虚线，这里以10个像素为单位，画6个像素点，空4个像素点也就成了虚线。

drawHBar方法：

　　　　protected function drawHBar():void
{
//矩形高度
var vHBarHeight:Number = this._mYGap * 2 / 5;
_mMainHDraw.removeAllElements();

var vGroup:Group = this._mMainHDraw;
vGroup.removeAllElements();
var vG:Graphics = vGroup.graphics;
vG.clear();
var vColumnNameTemp:String = null;
//从左到右从上到下画矩形
var columnLen:int = this.dataProvider.ColumnName.length;
//用来存放遍历到的主要数据
var vValue:Number = 0;
for(var vIndex:int = 0; vIndex < this.dataProvider.RowCount; vIndex++)
{
//累积的矩形宽度，最长不能超过100%
var vSumWidth:Number = 0;
//第一个数组0放的是Y轴标签，直接略过
for(var vColumnIndex:int = 1; vColumnIndex < columnLen; vColumnIndex++)
{
vColumnNameTemp = this.dataProvider.ColumnName[vColumnIndex];
//vColumnIndex是从1开始的，跳过“yAxisData”字段，这里要减去1
var vColor:uint = this.mHBarColorArray[(vColumnIndex-1) % this.mHBarColorArray.length];
vValue = Number(this._mPercentData[vColumnNameTemp][vIndex]);
if( vSumWidth>1) 
{
vSumWidth = 1;
}
vG.beginFill(vColor);	
vG.drawRect(vSumWidth*this._mMainHDraw.width, this._mYCachedTicks[vIndex] + this._mYGap/2 - vHBarHeight/2 , 
vValue*this._mMainHDraw.width, vHBarHeight);
vG.endFill();		
vSumWidth += vValue;
}	
}
vGroup = null;
vG = null;
}

根据数据源计算出个柱子的位置和大小并在主画布区域画出来。

还有鼠标事件处理方法就不一一列出，具体看完整代码。

MultilayerHorizontalBarChart.as文件：

package LineChartTableTest
{
import DataEntity.DataTable;

import flash.display.Graphics;
import flash.events.MouseEvent;
import flash.geom.Point;
import flash.text.TextLineMetrics;
import flash.utils.Dictionary;

import mx.controls.Label;
import mx.controls.Text;
import mx.core.UIComponent;
import mx.graphics.SolidColor;

import spark.components.BorderContainer;
import spark.components.Group;
import spark.layouts.VerticalLayout;
/**
 * 水平叠柱状图 
 * @author haojie.wang
 * @date 2013-4-27
 * @version 1.0
 * <b>
 *  X轴为百分比，Y轴为各指标\n
 *  这里必须注意的是categoryField的设置，dataTable的column[0]必须是_categoryField的值
 * </b>
 */
public class MultilayerHorizontalBarChart extends UIComponent
{
protected static const DEFAULT_HEIGHT:Number = 300;
protected static const DEFAULT_WIDTH:Number = 960;

//===========================
// 可通过外部属性定义从而改变控件属性start
//===========================
/**
 * X轴的高度 
 */
protected var _mXAxisHeight:Number = 50;
/**
 *  Y轴宽度
 */
protected var _mYAxisWidth:Number = 100;
/**
 * 等分值，把X轴设成多少等分，默认为10 
 */
private var _xBisectNum:int = 10;
/**
 * X轴单位
 */
private var _mXUnit:String;
/**
 * Y轴单位
 */
private var _mYUnit:String;
/**
 * 图表名称
 */
private var _mChartName:String;
/**
 * 是否显示悬浮框 
 */
protected var _mFloatIsShow:Boolean = true;

//===========================
// 可通过外部属性定义从而改变控件属性end
//===========================


//===========================
// 接收控件所需要的数据参数start
//===========================	

/**
 * 主要数据源 
 */
protected var _dataProvider:DataTable;	
/**
 * 字段参数 ,默认为“yAxisData”
 */
protected var _categoryField:String ="yAxisData";

/**
 * 颜色数组 
 */
protected var _mHBarColorArray:Array;	
//===========================
// 接收控件所需要的数据参数end
//===========================	


//===========================
// 控件内部使用属性，不需要外部传值start
//===========================	
/**
 * 每行的总和数组，统计每行各数值的和 
 */
protected var _mRowSumArray:Array;
/**
 * 存放DataTable里data数据的百分比格式 
 */
protected var _mPercentData:Dictionary;
/**
 *需要画的柱子的层数,默认为6
 */
protected var _mHBarCenNum:int = 6;	
/**
 * X轴度量值间隔 
 */
protected var _mXGap:Number;  
/**
 * Y轴度量值间隔 
 */
protected var _mYGap:Number;  
/**
 *  暂存X轴刻度数据
 */
protected var _mXCachedTicks:Vector.<Number> /* 数字 */ = null;
/**
 *  暂存X轴数据,累计刻度值
 */
protected var _mXCacheValueTicks:Vector.<Number> /* 数字 */ = null;
/**
 * X轴刻度相关，距离为1像素，暂时不给外部输入，无关紧要，setter和getter方法注销掉了
 */
protected var _mPadding:Number = 1;
/**
 * Y刻度缓存数组 
 */
protected var _mYCachedTicks:Vector.<Number> = null;
/**
 * Y轴的最大值 
 */
protected var _mYMaxValue:Number;
/**
 * 当前Y轴光标索引 
 */
protected var _countIndexY:int = 0;		
/**
 * 检查数据是否为空，true表示数据不为空
 */
protected var _checkData:Boolean = true;	
/**
 * 直方图数量 
 */
protected var _mHBarNum:int;
/**
 * X轴 
 */
private var _mXis:Group;
/**
 * Y轴 
 */
private var _mYis:Group;

/**
 * 直方图上方的数据刷新显示区域 
 */
private var _mHBarIDLable:Group;
/**
 * Y轴上ID标签的高度 
 */
protected var _mHBarIDLableHeight:int = 25;
/**
 * 网格 
 */		
private var _gridLines:Group;
/**
 * 主要数据显示区域 
 */
private var _mMainHDraw:Group;
/**
 * 事件监听层 
 */
private var _mEventGroup:Group;
/**
 * 是否为刷新 
 */
protected var _isReflash:Boolean = true;
/**
 * 浮动框外层
 */
private var floatDataPanel:BorderContainer;
/**
 * 浮动框内层
 */
private var floatInerPanel:BorderContainer;
/**
 *  浮动框内层显示的内容
 */
private var vLabel1: Text= new Text();

//===========================
// 控件内部使用属性，不需要外部传值end
//===========================	

public function MultilayerHorizontalBarChart()
{
super();
}

override protected function createChildren():void
{
super.createChildren();
if (_mXis == null)
{
_mXis = new Group();
addChild(_mXis);
}
if (_mYis == null)
{	
_mYis = new Group();
addChild(_mYis);
} 
if (_mHBarIDLable == null )
{
_mHBarIDLable = new Group();
addChild(_mHBarIDLable);
}
if (_gridLines == null)
{
_gridLines = new Group();
addChild(_gridLines);
}
if (_mMainHDraw == null)
{	
_mMainHDraw = new Group();
addChild(_mMainHDraw);	
} 
if (_mEventGroup == null){
_mEventGroup = new Group();
addChild(_mEventGroup);
_mEventGroup.addEventListener(MouseEvent.MOUSE_OUT, deleDataHandler);
_mEventGroup.addEventListener(MouseEvent.MOUSE_MOVE,showDataHandler);
} 
if (mFloatIsShow)
{
if (floatDataPanel == null)
{
floatDataPanel = new BorderContainer();
floatInerPanel = new BorderContainer();
floatDataPanel.setStyle("cornerRadius",15);
floatInerPanel.setStyle("cornerRadius",15);
var vs:SolidColor = new SolidColor();
vs.color = 0x6A726B;
vs.alpha = 0.3;
floatDataPanel.backgroundFill = vs;
floatDataPanel.visible = false;
_mEventGroup.addElement(floatDataPanel);
}
}
}

override protected function commitProperties():void
{
super.commitProperties();
//显示浮动窗口
if (mFloatIsShow)
{
var vsIner:SolidColor = new SolidColor();
vsIner.color = 0x000000;
vsIner.alpha = 0.8;

var vver:VerticalLayout = new VerticalLayout();
vver.paddingBottom = 2;
vver.paddingLeft = 2;
vver.paddingRight = 2;
vver.paddingTop =2;

floatDataPanel.layout = vver;
floatInerPanel.backgroundFill = vsIner;
floatInerPanel.setStyle("color",0xFFFFFF);
floatInerPanel.addElement(vLabel1);		
vLabel1.horizontalCenter = 0;
floatDataPanel.addElement(floatInerPanel);
floatInerPanel.move(2,2);
floatDataPanel.setActualSize(200,vLabel1.height+50);
floatInerPanel.setActualSize(vLabel1.width,vLabel1.height);
}

}
override protected function measure():void
{
super.measure();
measuredMinHeight = measuredHeight = DEFAULT_HEIGHT;
measuredMinWidth = measuredWidth = DEFAULT_WIDTH;
}
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{
if (_isReflash)
{
super.updateDisplayList(unscaledWidth, unscaledHeight);
if (dataProvider == null)
{
return;
}
for (var i:int = 0; i < dataProvider.ColumnName.length; i++)
{	
//如果存在空数据就设定标识退出循环
if (null == dataProvider.Data[dataProvider.ColumnName[i]])
{
_checkData = false;
break;
}
}
if (_checkData)
{
drawLayouts(unscaledWidth,unscaledHeight);
drawXAxis();
drawYAxis();
drawGrid();
legendHBarLine();
drawHBar();			
}
_isReflash = false;
}
}

/**
 * 安排布局
 */
protected function drawLayouts(pW:Number, pH:Number):void
{
this._mXis.setActualSize(pW - this.mYAxisWidth, this.mXAxisHeight);
_mXis.move(this.mYAxisWidth, pH - this.mXAxisHeight);
this._mYis.setActualSize(this.mYAxisWidth, pH - this.mXAxisHeight - this.mHBarIDLableHeight);
this._mYis.move(0,this.mHBarIDLableHeight);

//X轴标签位置
this._mHBarIDLable.setActualSize(pW - this.mYAxisWidth, this.mHBarIDLableHeight);
this._mHBarIDLable.move(this.mYAxisWidth, -10);

this._gridLines.setActualSize(pW - this.mYAxisWidth, pH - this.mXAxisHeight - this.mHBarIDLableHeight);
this._gridLines.move(this.mYAxisWidth, this.mHBarIDLableHeight);

this._mMainHDraw.setActualSize(pW - this.mYAxisWidth, pH - this.mXAxisHeight - this.mHBarIDLableHeight);
this._mMainHDraw.move(this.mYAxisWidth, this.mHBarIDLableHeight);

this._mEventGroup.setActualSize(pW - this.mYAxisWidth,  pH - this.mXAxisHeight - this.mHBarIDLableHeight);
this._mEventGroup.move(this.mYAxisWidth, this.mHBarIDLableHeight);
}

/**
 * 画百分比X轴
 */
protected function drawXAxis():void
{
var _mXMaxValue:Number =100;
// TODO Auto Generated method stub

var vGroup:Group = this._mXis;
var vG:Graphics = vGroup.graphics;

vGroup.removeAllElements();
vG.clear();
vG.lineStyle(1, 0x000000,0.8);
vG.moveTo(0, 0);
vG.lineTo(vGroup.width,0);
_mXCachedTicks = new Vector.<Number>();
_mXCacheValueTicks = new Vector.<Number>();
//将X轴分成xbisectNum等份 默认为10
var vCount:int = xBisectNum;
var vGap:Number = vGroup.width / vCount;
var vGapValue:Number = _mXMaxValue / vCount;
var vNum:Number;
var vX:Number
for(var i:int=0; i <= vCount; i++){
vX = i * vGap;
vG.moveTo(vX, 0);
vG.lineTo(vX,6);
_mXCachedTicks.push(vX);

var vTextField:Text = new Text();
vNum = i*vGapValue;
vTextField.text = vNum.toString() + "%";
var vTlm:TextLineMetrics = measureText(vTextField.text);
vTextField.move( vX - vTlm.width / 2, 10);
vGroup.addElement(vTextField);
}
vGroup = null;
vG = null;
}

/**
 * 画Y轴 
 */
protected function drawYAxis():void
{
var vGroup:Group = this._mYis;
var vG:Graphics = vGroup.graphics;
vGroup.removeAllElements();
vG.clear();
vG.lineStyle(1, 0x000000,0.8);
vG.moveTo(vGroup.width, 0);
vG.lineTo(vGroup.width, vGroup.height);
_mYCachedTicks = new Vector.<Number>();
//Y轴数据的个数
var vCount:int = this.dataProvider.RowCount;
var vGap:Number = vGroup.height / vCount;
//存储Y轴刻度高度，供之后画图使用
this._mYGap = vGap;

vG.moveTo(vGroup.width - 6, 0);
vG.lineTo(vGroup.width, 0);

for (var i:int = 0; i <= vCount; i++) {
var vY:Number = (i) * vGap;
vG.moveTo(vGroup.width-6, vY);
vG.lineTo(vGroup.width, vY);
_mYCachedTicks.push(vY);
var vTextField:Label = new Label();
if (i < vCount) 
{
//把Y轴的显示的标签加上
vTextField.text = this.dataProvider.Data[categoryField][i];
var vTlm:TextLineMetrics = measureText(vTextField.text);
vTextField.move(vGroup.width - vTlm.width - 20, vY + vGap/2 - vTlm.height / 2);
vGroup.addElement(vTextField);
}
}
vGroup = null;
vG = null;
}

/**
 * 画网格
 */
protected function drawGrid():void 
{
var vGroup:Group = _gridLines;
var vG:Graphics = vGroup.graphics;
vG.clear();
var vColor:uint = 0xBFBFBF;
var vAlpha:Number = 0.3;
vG.lineStyle(1, vColor, vAlpha);
var vLen:Number;
var vPoint:Point;
var i:int;
var pos:int;

//画横线
if (_mYCachedTicks && _mYCachedTicks.length > 0) 
{
vLen = vGroup.width / 10;
var vgHeight:Number;
for (i = 0; i < _mYCachedTicks.length - 1; i++) 
{
vgHeight = _mYCachedTicks[i];
for (pos = 0; pos < vLen; pos++)
{
vG.moveTo(pos * 10, vgHeight);
vG.lineTo(pos * 10 + 6, vgHeight);
}
}
}

//画竖线
if (_mXCachedTicks && _mXCachedTicks.length > 0) {
vLen = vGroup.height / 10;
var vMax:int = _mXCachedTicks.length;
for (i = 1; i < vMax; i++) {
var vWidth:Number = _mXCachedTicks[i];
for (pos = 0; pos < vLen; pos++) {
vG.moveTo(vWidth, pos * 10);
vG.lineTo(vWidth, pos * 10 + 6);
}
}
}
}

/**
 * 画数据标签提示 
 */
protected function legendHBarLine():void
{
var vGroup:Group = this._mHBarIDLable;
var vIDLableLen:Number = vGroup.width/this._mHBarCenNum;
var vGap:Number = vIDLableLen / 6;
var vHLineLen:Number = vGap*0.6;

var vHY:Number = vGroup.height /2;
var vG:Graphics =vGroup.graphics;
_mHBarIDLable.removeAllElements();
vG.clear();
var vLBuffef:Number = 0;
for(var i:int=0; i < this._mHBarCenNum; i++)
{
var vName:Label = new Label(); 
vG.lineStyle(0.2, this.mHBarColorArray[i%this.mHBarColorArray.length]);			//对颜色数组取余可防止颜色数组不足时index越界
vG.beginFill(mHBarColorArray[i]);
vG.drawRect(vLBuffef,vHY,vHLineLen,vHLineLen);
vG.endFill();
vName.text = this.dataProvider.ColumnName[i+1];
vName.x = vLBuffef + vHLineLen;
vName.y = vHY/2;
_mHBarIDLable.addElement(vName);
vLBuffef += vIDLableLen;
}
vGroup = null;
vG = null;
}

/**
 * 画直方图 
 */
protected function drawHBar():void
{
//矩形高度
var vHBarHeight:Number = this._mYGap * 2 / 5;
_mMainHDraw.removeAllElements();

var vGroup:Group = this._mMainHDraw;
vGroup.removeAllElements();
var vG:Graphics = vGroup.graphics;
vG.clear();
var vColumnNameTemp:String = null;
//从左到右从上到下画矩形
var columnLen:int = this.dataProvider.ColumnName.length;
//用来存放遍历到的主要数据
var vValue:Number = 0;
for(var vIndex:int = 0; vIndex < this.dataProvider.RowCount; vIndex++)
{
//累积的矩形宽度，最长不能超过100%
var vSumWidth:Number = 0;
//第一个数组0放的是Y轴标签，直接略过
for(var vColumnIndex:int = 1; vColumnIndex < columnLen; vColumnIndex++)
{
vColumnNameTemp = this.dataProvider.ColumnName[vColumnIndex];
//vColumnIndex是从1开始的，跳过“yAxisData”字段，这里要减去1
var vColor:uint = this.mHBarColorArray[(vColumnIndex-1) % this.mHBarColorArray.length];
vValue = Number(this._mPercentData[vColumnNameTemp][vIndex]);
if( vSumWidth>1) 
{
vSumWidth = 1;
}
vG.beginFill(vColor);	
vG.drawRect(vSumWidth*this._mMainHDraw.width, this._mYCachedTicks[vIndex] + this._mYGap/2 - vHBarHeight/2 , 
vValue*this._mMainHDraw.width, vHBarHeight);
vG.endFill();		
vSumWidth += vValue;
}	
}
vGroup = null;
vG = null;
}

/**
 * 显示数据处理 
 * @param pEvent
 * 
 */
protected function showDataHandler(pEvent:MouseEvent):void
{
countIndexY = int(pEvent.localY  / this._mYGap); //第几个柱子
if (countIndexY >= this._mHBarNum) 
{
return;
}
//鼠标光标在柱子上时候，柱子高度占刻度值的1/3
if (pEvent.localY > (countIndexY+1.5/5) * this._mYGap && pEvent.localY < (countIndexY + 3.5 / 5) * this._mYGap)
{
//如果显示浮动框，要设置好位置，防止出界
if (mFloatIsShow)
{
//					trace("Y:" + pEvent.localY + "X:" + pEvent.localX);
if (pEvent.localY > this._mMainHDraw.height - floatDataPanel.height-  10 )
{
if (pEvent.localX >  this._mMainHDraw.width - floatDataPanel.width)
{
floatDataPanel.move(pEvent.localX - floatDataPanel.width, pEvent.localY -floatDataPanel.height-10);
}
else
{
floatDataPanel.move(pEvent.localX , pEvent.localY -floatDataPanel.height-10);
}
}
else
{
if (pEvent.localX >  this._mMainHDraw.width - floatDataPanel.width)
{
floatDataPanel.move(pEvent.localX - floatDataPanel.width, pEvent.localY + 10);
}
else
{
floatDataPanel.move(pEvent.localX, pEvent.localY +10);
}
}
updHBarLabelData(countIndexY,pEvent.localX);
}
}
else
{
updHBarLabelData(-1,0);

}
}

/**
 * 更新显示数据 
 * @param mHBarIndexY 当前是第几个柱子
 * @param pMouseX 鼠标的位置
 */
protected function updHBarLabelData(mHBarIndexY:int, pMouseX:Number):void
{
if (mHBarIndexY == -1)
{
if(mFloatIsShow)
{
floatDataPanel.visible = false;
}	
}
else
{
//防止数组越界
if (mHBarIndexY < this.dataProvider.RowCount)
{
var vDataString:String = "XXX";
var vSourceDataString:String = "XX";
var vColumnName:String = "OO";
var vSumNum:Number = 0;				//累计柱子各段长百分比
var vSumNumArr:Array = new Array();				//累计柱子各段长百分比数组，用来判断光标在那段柱子上
vSumNumArr[0] = vSumNum;
var vIndex:int = 1;
for each(var vItem:String in this.dataProvider.ColumnName)
{
//categoryField字段是Y轴标签，这里跳过
if (categoryField != vItem)
{
vSumNum += this._mPercentData[vItem][mHBarIndexY];
vSumNumArr[vIndex] = vSumNum;
//找到对应的区间
if (vSumNumArr[vIndex - 1] * this._mMainHDraw.width < pMouseX &&  pMouseX <= vSumNumArr[vIndex] * this._mMainHDraw.width)
{
vColumnName = vItem;
vSourceDataString = this.dataProvider.Data[vItem][mHBarIndexY].toString();
vDataString = percentDataFormatter(this._mPercentData[vItem][mHBarIndexY] * 100);
break;
}
vIndex++;
}

}

if (mFloatIsShow)
{
if (this.mChartName != null && this._mYUnit != null)
{
vLabel1.text = this.dataProvider.Data[categoryField][mHBarIndexY] + this._mYUnit + " "
+vColumnName + " " + this.mChartName + " : "
+vDataString + "(" + vSourceDataString + "/" + this._mRowSumArray[mHBarIndexY] + ")";
}
else
{
vLabel1.text = this.dataProvider.Data[categoryField][mHBarIndexY] + " : "
+vDataString + "(" + vSourceDataString + "/" + this._mRowSumArray[mHBarIndexY] + ")";
}

vLabel1.horizontalCenter = 0;
vLabel1.verticalCenter = 0;
//获取鼠标所在的柱子的颜色
var vHFloatColor:uint = this.mHBarColorArray[(this.dataProvider.ColumnName.indexOf(vColumnName)-1)%this.mHBarColorArray.length];
changeFloatBackColor(vHFloatColor);
floatDataPanel.visible = true;	
}
}
}
}

/**
 * 
 * 鼠标移除事件
 */
protected function deleDataHandler(pEvent:MouseEvent):void
{
removeEventListener(MouseEvent.MOUSE_MOVE,showDataHandler);
if (mFloatIsShow)
{
floatDataPanel.visible = false;
}	
}

/**
 * 动态改变浮动框背景
 **/
protected function changeFloatBackColor(pColor:uint):void
{
var vs:SolidColor = new SolidColor();
vs.color = pColor;
vs.alpha = 0.8;
floatInerPanel.backgroundFill = vs;
}

/**
 * 将传入的数值格式化为百分比形式
 * @param pNumber 要格式化的数值
 * @return  以百分比形式显示的字符串
 * 
 */		
protected function percentDataFormatter(pNumber:Number):String 
{
var vNumber:Number = pNumber;

return vNumber.toFixed(2) + "%";
}

//===========================
// 属性定义的setter和getter方法start
//===========================
/**
 * X轴的高度 
 */
public function get mXAxisHeight():Number
{
return _mXAxisHeight;
}

public function set mXAxisHeight(value:Number):void
{
_mXAxisHeight = value;
}

/**
 * Y轴宽度 
 * @return 
 */
public function get mYAxisWidth():Number
{
return _mYAxisWidth;
}

public function set mYAxisWidth(value:Number):void
{
_mYAxisWidth = value;
}

/**
 * 当前光标Y轴索引 
 * @return 
 */
public function get countIndexY():int
{
return _countIndexY;
}

public function set countIndexY(value:int):void
{
_countIndexY = value;
}
/**
 * 直方图上方标签的高度 
 * @return _mHBarIDLableHeight;
 */
public function get mHBarIDLableHeight():int
{
return _mHBarIDLableHeight;
}

public function set mHBarIDLableHeight(value:int):void
{
_mHBarIDLableHeight = value;
}
/**
 * 数据源 
 * @return _dataProvider;
 */
public function get dataProvider():DataTable
{
return _dataProvider;
}
public function set dataProvider(value:DataTable):void
{
this._dataProvider = value;
this._mHBarNum = this.dataProvider.RowCount;
this._mHBarCenNum = this.dataProvider.ColumnName.length -1;

this._mRowSumArray = new Array(this._mHBarNum);
var vIndex:int = 0;
//统计个行数据的和，并把它存放进总和数组
for (var i:int = 0; i < this.dataProvider.RowCount; i++)
{
var vSum:Number = 0;
for each (var vItem:String in this.dataProvider.ColumnName)
{
//统计各行数据的和
if (vItem != this.categoryField)
{
vSum += Number(this.dataProvider.Data[vItem][i]) ; 
}
}
this._mRowSumArray[vIndex] = vSum;
vIndex ++;
}

//把dataTable的Data数据转换成相对应的百分比
this._mPercentData = new Dictionary();
for each (var vItem1:String in this.dataProvider.ColumnName)
{
if (vItem1 != this.categoryField)
{
this._mPercentData[vItem1] = new Array();
for (var j:int = 0; j < this.dataProvider.RowCount; j++)
{
this._mPercentData[vItem1][j] = Number(this.dataProvider.Data[vItem1][j]) / this._mRowSumArray[j];
}
}
}

this.invalidateDisplayList();
}

/**
 * 字段参数 默认为“yAxisData”
 * @return _categoryField;
 */
public function get categoryField():String
{
return _categoryField;
}

public function set categoryField(value:String):void
{
_categoryField = value;
}

/**
 * 是否显示悬浮框 
 * @return _mFloatIsShow;
 */
public function get mFloatIsShow():Boolean
{
return _mFloatIsShow;
}

/**
 * @private
 */
public function set mFloatIsShow(value:Boolean):void
{
_mFloatIsShow = value;
}
/**
 * X轴单位 
 * @return _mXUnit;
 */
public function get mXUnit():String
{
return _mXUnit;
}
/**
 * @private
 */
public function set mXUnit(value:String):void
{
_mXUnit = value;
}
/**
 * 左边Y轴单位
 * @return _mYUnit;
 */
public function get mYUnit():String
{
return _mYUnit;
}
/**
 * @private
 */
public function set mYUnit(value:String):void
{
_mYUnit = value;
}
/**
 * 等分值，把X轴设成多少等分，默认为10 
 */
public function get xBisectNum():int
{
return _xBisectNum;
}
/**
 * @private
 */
public function set xBisectNum(value:int):void
{
_xBisectNum = value;
}
/**
 * 图标名称
 */
public function get mChartName():String
{
return _mChartName;
}
/**
 * @private
 */
public function set mChartName(value:String):void
{
_mChartName = value;
}
/**
 * 颜色数组 
 */
public function get mHBarColorArray():Array
{
return _mHBarColorArray;
}
/**
 * @private
 */
public function set mHBarColorArray(value:Array):void
{
_mHBarColorArray = value;
}
//===========================
// 属性定义的setter和getter方法end
//===========================
}
}

Flex自定义组件开发 - jackyWHJ,布布扣,bubuko.com

Flex自定义组件开发 - jackyWHJ

原文：http://www.cnblogs.com/wshsdlau/p/3744027.html