分类目录归档：flex

JasperReports flash打印实现

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JasperReports是一个基于Java的开源报表工具，可以在ireport中进行设计后，输出HTML，PDF，Excell，OpenOffice和Word格式。JasperReports支持applet方式打印，但是flash方式却是注释掉的。在net\sf\jasperreports\flex\view\Viewer.mxml文件中

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<!--
<mx:Button width="22" toolTip="Print Report" id="btnPrintReport0"
  buttonMode="true"enabled="false" >
    <mx:icon>@Embed(source='images/print.GIF')</mx:icon>
</mx:Button>
<mx:Button width="22" toolTip="Print Report" id="btnReload"
  buttonMode="true"  enabled="true" click="btnReloadClick()">
    <mx:icon>@Embed(source='images/reload.GIF')</mx:icon>
</mx:Button>
 -->

本文主要完成JasperReports的flash打印功能，是基于JasperReports Flash Viewer 4.0.0修改，参考了网络上基于3.0版本的修改。将Viewer.mxml文件上面的文字修改为

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<mx:Button width="22" toolTip="Print Report" id="btnPrintReport0"
  buttonMode="true" enabled="false" click="btnPrintReport()">
   <mx:icon>@Embed(source='images/print.GIF')</mx:icon>
</mx:Button>
<!--
<mx:Button width="22" toolTip="Print Report" id="btnReload"
  buttonMode="true" enabled="true" click="btnReloadClick()">
    <mx:icon>@Embed(source='images/reload.GIF')</mx:icon>
</mx:Button>
-->

在Viewer.mxml中找到refreshPage函数，启用打印按钮，将

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if (report.pageCount > 0)
{
    var pageCanvas:PageCanvas = new  PageCanvas(report.pages[pageIndex]);
    pageCanvas.scaleX = zoomRatio;
    pageCanvas.scaleY = zoomRatio;
 
    pageBox.visible = false;
    pageBox.removeAllChildren();
    pageBox.addChild(pageCanvas);
    pageBox.visible = true;
}

修改为

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if (report.pageCount > 0)
{
    var pageCanvas:PageCanvas = new  PageCanvas(report.pages[pageIndex]);
    pageCanvas.scaleX = zoomRatio;
    pageCanvas.scaleY = zoomRatio;
 
    pageBox.visible = false;
    pageBox.removeAllChildren();
    pageBox.addChild(pageCanvas);
    pageBox.visible = true;
    btnPrintReport0.enabled = true;
}

在Viewer.mxml中引入net\sf\jasperreports\flex\view\PrintMananger.as文件，以支持打印

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import net.sf.jasperreports.flex.view.PrintManager;

在Viewer.mxml增加打印函数btnPrintReport

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public function  btnPrintReport():void
{
    PrintManager.printAll(jrpxmlUrl,pageFetchSize,report);
}

net\sf\jasperreports\flex\view\PrintMananger.as文件内容

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package net.sf.jasperreports.flex.view
{
    import flash.events.EventDispatcher;
    import flash.events.SecurityErrorEvent;
    import flash.events.Event;
    import flash.events.ProgressEvent;
    import mx.core.UIComponent;
    import mx.collections.IList;
    import mx.collections.ArrayCollection;
    import net.sf.jasperreports.flex.view.PageCanvas;
    import net.sf.jasperreports.flex.model.Report;
    import net.sf.jasperreports.flex.xml.ReportFactory;
    import flash.events.HTTPStatusEvent;
    import flash.net.URLLoader;
    import flash.net.URLRequest;
    import flash.events.IOErrorEvent;
    import mx.printing.FlexPrintJobScaleType;
    import mx.printing.FlexPrintJob;
    import mx.core.Application;
    import mx.containers.VBox;
    import mx.events.FlexEvent;
 
    public class PrintManager extends EventDispatcher
    {
        private var url:String;
        private var urlLoader:URLLoader;
        private var report:Report;
        private var pageIndex:int = 0;
        private var pageFetchSize:int = 1;
 
        private var componentsToBeInitialized:int = 0;
        private var pagesPrint:Array = [];
 
        public const LOAD_PAGE:String="loadPage";
        public const ALL_PAGE:String = "allPageLoader";
 
        public function PrintManager(){
            super();
        }
 
        public function get url():String
        {
            return url;
        }
 
        public function set url(value:String):void
        {
            url=value;
        }
        public function set fetchSize(fetchSize:int):void
        {
            pageFetchSize = fetchSize;
        }
        public static function printAll(url:String,fetchSize:int,report:Report):void
        {
            var pm:PrintManager = new PrintManager();
            pm.url = url;
            pm.pageFetchSize = fetchSize;
            pm.report = report;
            pm.loadAll();
        }
        private function loadAll():void
        {
            this.addEventListener(LOAD_PAGE, onLoadPage);
            this.addEventListener(ALL_PAGE, onAllPageLoaded);
            pageIndex=0;
 
            if (report)
            {
                var loadFlag:Boolean=false;
                while (pageIndex < report.pageCount) {
                    if (!report.pages[pageIndex]) {
                        loadFlag=true;
                        break;
                    }
                    pageIndex++;
                }
            }
 
            if (loadFlag) {
                loadPage();
            }
            else{
                removeEventListener(LOAD_PAGE, onLoadPage);
                dispatchEvent(new Event(ALL_PAGE));
            }
        }
 
        private function onLoadPage(e:Event):void
        {
            pageIndex++;
            if (pageIndex < report.pageCount) {
                if(!report.pages[pageIndex]){
                    loadPage();
                }
            }
            else{
                removeEventListener(LOAD_PAGE, onLoadPage);
                dispatchEvent(new Event(ALL_PAGE));
            }
        }
 
        public function  onAllPageLoaded(event:Event):void
        {
            var cur:int;
            var uc:UIComponent;
            var pj:*;
            if (report != null){
                pj = new FlexPrintJob();
                pj.printAsBitmap = false;
                if (pj.start()){
                    cur = 0;
                    while (cur < report.pageCount) {
                        uc = processPage(new PageCanvas(report.pages[cur]));
                        Application.application.addChild(uc);
                        pj.addObject(uc);
                        Application.application.removeChild(uc);
                        cur++;
                    };
                    pj.send();
                };
            } else {
 
            };
        }
        private function processPage(param1:PageCanvas):UIComponent{
            var vbox:* = new VBox();
            vbox.horizontalScrollPolicy = "off";
            vbox.verticalScrollPolicy = "off";
            vbox.width = report.pageWidth;
            vbox.height = report.pageHeight;
            vbox.setStyle("backgroundColor", "#FFFFFF");
            vbox.addChild(param1);
            return (vbox);
        }
 
        private function loadPage():void
        {
            urlLoader=new URLLoader();
            urlLoader.addEventListener(Event.COMPLETE, completeHandler);
            urlLoader.addEventListener(Event.OPEN, openHandler);
            urlLoader.addEventListener(ProgressEvent.PROGRESS, progressHandler);
            urlLoader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
            urlLoader.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
            urlLoader.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
            if (report)
            {
                var goRight:Boolean = true;
                var goLeft:Boolean = true;
                var right:int = 0;
                var left:int = 0;
 
                while(goRight || goLeft)
                {
                    if (
                        goRight
                        && left + right + 1 < pageFetchSize
                        && pageIndex + right + 1  < report.pageCount
                        && !report.pages[pageIndex + right + 1]
                        )
                    {
                        right++;
                    }
                    else
                    {
                        goRight = false;
                    }
 
                    if (
                        goLeft
                        && left + right + 1 < pageFetchSize
                        && pageIndex - left - 1 >= 0
                        && !report.pages[pageIndex - left - 1]
                        )
                    {
                        left++;
                    }
                    else
                    {
                        goLeft = false;
                    }
                }
 
                urlLoader.load(new URLRequest(url + "&startPage=" + (pageIndex - left) + "&endPage=" + (pageIndex + right)));
            }
            else
            {
                //first load; pageIndex == 0
                urlLoader.load(new URLRequest(url + "&page=" + pageIndex));
            }
        }
 
        private function completeHandler(event:Event):void
        {
            var newReport:Report = ReportFactory.create(XML(urlLoader.data));
 
            var i:int;
            var pages:IList;
 
            if (report)
            {
                pages = report.pages;
            }
            else
            {
                //first load
                report = newReport;
                pages = new ArrayCollection(new Array(report.pageCount));
            }
 
            for(i = newReport.startPageIndex; i <= newReport.endPageIndex; i++)
            {
                pages[i] = newReport.pages[i - newReport.startPageIndex];
            }
 
            report.pages = pages;
 
            report.startPageIndex = Math.min(report.startPageIndex, newReport.startPageIndex);
            report.endPageIndex = Math.max(report.endPageIndex, newReport.endPageIndex);
 
            refreshPage();
        }
        private function openHandler(event:Event):void
        {
            trace("openHandler: " + event);
        }
 
        private function progressHandler(event:ProgressEvent):void
        {
            trace("progressHandler loaded:" + event.bytesLoaded + " total: " + event.bytesTotal);
        }
 
        private function securityErrorHandler(event:SecurityErrorEvent):void
        {
            trace("securityErrorHandler: " + event);
        }
 
        private function httpStatusHandler(event:HTTPStatusEvent):void
        {
            trace("httpStatusHandler: " + event);
        }
 
        private function ioErrorHandler(event:IOErrorEvent):void
        {
            trace("ioErrorHandler: " + event);
        }
 
        private function refreshPage():void
        {
            if (report) {
                this.dispatchEvent(new Event(this.LOAD_PAGE));
            }
        }
    }
}

编译Main.mxml运行，即实现打印功能，但是包含图片的打印依然打印不出来。对于这种动态图片的打印添加了等待事件完成，仍能无效，不知道有没有好的实现。
参考链接：
JasperReports Library
完成Flex报表设计、生成、打印功能
Flex 4 Printing Problem with dynamic components