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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">自定义快速报表的打印预览窗口</font><br><span class="nava"><font color="#CC9933">2000-06-11· -·中国计算机世界出版服务公司</font></span></p><p> QuickReport2.0中提供的默 认打印预览窗口是英文界面的，如果开发的中文软件中带有这种英文显示， 不免有些小小的缺憾。因此有必要实现中文界面的打印预览窗口。但是Delphi提供的源代码中并没有打印预览窗口.PAS源文件，这就无法直接修改源 码，只能全部自己编程实现。经多次实践，笔者模仿实现了与默认预览窗口外观类似，功能相同的打印预览窗口。步骤如下：</p> <p> 1.新建一个窗体，设置Name为MyPreview。 <br> 2.在窗体上添加一Toolbar控件， 模仿默认预览窗口创建相应的Toolbutton，并设置各按钮的Hint提示。<br> 3.添加一Panel控件，对齐方式置 为alBottom。再在此Panel上放一ProgressBar(左对齐)和Panel(右对齐)， 分别显示报表装载进度和其他提示信息。<br> 4.添加QRPreview控件，对齐方式 置为alClient。<br> 5.添加OpenDialog，设置Filter 属性为*.QR；添加SaveDialog，设置Filter属性为*.QR|*.TXT|*.HTM|*.CSV， 设置DefaultExt属性为*.QR。<br> 6.双击各个Toolbutton，输入相 应代码。<br> 可以按以下方法调用自定义预览 窗口。</p> <p>重载TQuickRep的OnPreview事件， 输入如下代码：</p> <blockquote> <blockquote> <p> procedureTRptForm.RptFormPreview(Sender:TObject);<br> begin<br> withTMyPreview.Create(Application)do<br> begin<br> QRPreview1.QRPrinter:=TQRPrinter(Sender);<br> CurRep:=self;<br> Show;<br> end;<br> end;<br> </p> </blockquote> </blockquote> <p>附各成员方法的具体实现：</p> <blockquote> <blockquote> <p> unitMyprv; <br> interface<br> uses<br> Windows,Messages,SysUtils,Classes,Graphics,Controls, Forms,Dialogs,ComCtrls,ToolWin,qrprntr,Quickrpt,StdCtrls, ExtCtrls,qrextra,qrhtml;<br> <br> type<br> TMyPreview=class(TForm)<br> QRPreview1:TQRPreview;<br> ToolBar1:TToolBar;<br> (其余成员变量和成员方法声明略。)<br> private<br> {Privatedeclarations}<br> FPageCount:integer;// 生成报表的总页数<br> public<br> {Publicdeclarations}<br> CurRep:TQuickRep; //所预览的报表<br> procedureUpdatePanelShow;<br> end;<br> <br> implementation<br> <br> {$R*.DFM}<br> procedureTMyPreview.UpdatePanelShow;<br> begin//更新显示<br> Panel2.Caption:='第'+inttostr(QRPreview1.PageNumber)+ '页总'+inttostr(FPageCount)+'页';<br> end;<br> <br> procedureTMyPreview.ToolButton2Click(Sender:TObject);<br> begin//ZoomToFit缩放至全屏<br> QRPreview1.ZoomToFit;<br> end;<br> <br> procedureTMyPreview.ToolButton3Click(Sender:TObject);<br> begin//ZoomTo100%缩放至实际大小<br> QRPreview1.Zoom:=100;<br> end;<br> <br> procedureTMyPreview.ToolButton4Click(Sender:TObject);<br> begin//ZoomToWidth缩放至页宽<br> QRPreview1.ZoomToWidth;<br> end;<br> <br> procedureTMyPreview.ToolButton6Click(Sender:TObject);<br> begin//Firstpage<br> QRPreview1.PageNumber:=1;<br> UpdatePanelShow;<br> end;<br> <br> procedureTMyPreview.ToolButton8Click(Sender:TObject);<br> begin//priorpage<br> QRPreview1.PageNumber:=QRPreview1.PageNumber+1;<br> UpdatePanelShow;<br> end;<br> <br> procedureTMyPreview.ToolButton7Click(Sender:TObject);<br> begin//nextpage<br> QRPreview1.PageNumber:=QRPreview1.PageNumber1;<br> ifQRPreview1.PageNumber=0then<br> QRPreview1.PageNumber:=1;<br> UpdatePanelShow;<br>⌨️ 快捷键说明
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