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求助:  怎么打印一个滚动区域 [复制链接]

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离线maldini3wx
新手上路
 
只看楼主 倒序阅读 楼主  发表于: 2010-04-29
  

  就是一个QTreeWidget,已经显示滚动条,要求把整个QTreeWidget的内容全打印出来.请问如何实现

  grabWidget 只能打印可见区的
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离线xtfllbl
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只看该作者 1楼 发表于: 2010-04-29
Re:求助:  怎么打印一个滚动区域
转段代码参考:
复制代码
  1. void QCurveQueryTool::printview()   //printFlag =2 , 打印预览
  2. {
  3.     QPrinter printer(QPrinter::ScreenResolution);
  4.     QPrintPreviewDialog preview(&printer, this);
  5.     preview.setMinimumSize(1000,900);
  6.     connect(&preview, SIGNAL(paintRequested(QPrinter *)),this, SLOT(printTable(QPrinter *)));
  7.     preview.exec();
  8. }
  10. void QCurveQueryTool::printTable(QPrinter *printer)
  11. {
  12.     QString title = QString("曲线打印");
  13.     printTableWidget(table,title,printer);
  14. }
  16. void QCurveQueryTool::printTableWidget(const QTableWidget* view,QString stitile,QPrinter *printer) //printFlag =1,打印表格
  17. {
  18.     double totalWidth = 0.0;
  19.     double totalHeight = 0.0;
  20.     double totalPageHeight=0.0;
  22.     int rows = view->model()->rowCount();   //行总数
  23.     const int cols = view->model()->columnCount(); //列总数
  25.     for (int c = 0; c < cols; ++c)  //求出列宽
  26.     {
  27.         totalWidth += view->columnWidth(c);
  28.     }
  30.     for (int r = 0; r < rows; ++r) //求出行宽
  31.     {
  32.         totalHeight += view->rowHeight(r);
  33.     }
  35.     QPainter painter(printer);
  36.     painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
  37.     painter.begin(printer);
  38.     QRect area = printer->paperRect();// paperRect();
  39.     QVector<int> startRow;
  40.     QVector<int> endRow;
  41.     int iCount = 0;
  42.     qreal left,top,right,bottom;
  43.     printer->getPageMargins(&left,&top,&right,&bottom,QPrinter::Point);
  44.     cout << "left = " << left << ", right = " << right << ", top = " << top << ", bottom = " << bottom << endl;
  45.     area.setHeight( int(area.height() - top - bottom) );
  46.     area.setWidth( int(area.width() - left - right) );
  48.     for (int p=0; p < rows; p++) //rows中保存了所有的行数 ， 找出每次打印的开始行和结束行
  49.     {
  50.         totalPageHeight += view->rowHeight(p); //求出所有的列高度
  51.         int pageFooter = 50 ;  //页脚的高度
  52.         int pageHeader = 50;   //页眉的高度
  53.         if (startRow.size() == 0)
  54.         {
  55.             pageFooter = 50 ;
  56.             pageHeader = 500;
  57.         }
  58.         if ((totalPageHeight >= (area.height() - pageFooter - pageHeader)) || (p == rows -1))  //如果目前累加列的高度大于或者等于可用页面高度 || 到达最后一行
  59.         {
  60.             totalPageHeight = view->rowHeight(p);
  61.             if (p == rows -1)
  62.             {
  63.                 if (p - iCount - 2 < 0)
  64.                 {
  65.                     startRow.push_back(0);
  66.                 }
  67.                 else
  68.                 {
  69.                     startRow.push_back(p - iCount - 2);
  70.                 }
  71.                 endRow.push_back(p);
  72.                 //cout << startRow.at(startRow.size() - 1) << " " << endRow.at(endRow.size() - 1) << endl;
  73.             }
  74.             else
  75.             {
  76.                 if (p - iCount - 2 < 0)
  77.                 {
  78.                     startRow.push_back(0);
  79.                     endRow.push_back(p - 2);
  80.                 }
  81.                 else
  82.                 {
  83.                     startRow.push_back(p - iCount - 1);
  84.                     endRow.push_back(p - 3);
  85.                 }
  86.                 //cout << startRow.at(startRow.size() - 1) << " " << endRow.at(endRow.size() - 1) << endl;
  87.             }
  88.             iCount = 0;
  89.         }
  90.         iCount++;
  91.     }
  93.     QTableWidget *printTable = new QTableWidget();
  94.     //printTable->horizontalHeader()->setResizeMode(QHeaderView::ResizeToContents);
  95.     //printTable->horizontalHeader()->setDefaultAlignment(Qt::AlignCenter);
  96.     //printTable->verticalHeader()->setResizeMode(QHeaderView::ResizeToContents);
  97.     //printTable->verticalHeader()->setDefaultAlignment(Qt::AlignCenter);
  98.     const double xscale = area.width() / totalWidth;
  99.     const double yscale = area.height() / totalHeight;
  100.     //const double pscale = area.height() / totalPageHeight;
  101.     //painter.scale(xscale , yscale); // With the scaling 3 It is Printing all
  102.     //painter.translate(area.x() + xscale, area.y() + pscale); //This is original
  103.     painter.translate(area.x() + xscale, area.y() + yscale);
  104.     //painter.save(); //commented
  105.     //int y=0 ;// This is introduced for the columns
  106.     //view->paintEvent(&event);
  107.     //QPainter paint(this);
  108.     //paint.setPen(Qt::red);
  109.     //paint.drawRect(0, 0, 0, 0);
  110.     QStyleOptionViewItem option;  
  111.     QPen pen;
  112.     pen.setColor(Qt::black);
  113.     pen.setWidth(1);
  114.     painter.setPen(pen);
  116.     int irowcount = -1;
  117.     float rate = 1;
  118.     for(int ipage = 0; ipage < startRow.size();ipage++)  //startRow有大，就有多少页需要打印
  119.     {
  120.         printTable->setColumnCount(view->columnCount() + 1);  //打印的列数为view的列数
  121.         printTable->setRowCount(endRow[ipage] - startRow[ipage] + 2);  //设置当前打印页的行数
  122.         for(int c = 1;c < cols + 1;c++)
  123.         {
  124.             printTable->setColumnWidth( c,(view->columnWidth(c - 1)) );
  125.             QTableWidgetItem *newItem = printTable->item(0,c);
  126.             if (!newItem)  //如果printTable的首行不存在，添加文字或者序号
  127.             {
  128.                 if (view->horizontalHeaderItem(c - 1)) //Returns the horizontal(水平的) header item for column
  129.                     newItem = new QTableWidgetItem(view->horizontalHeaderItem(c - 1)->text());
  130.                 else
  131.                     newItem = new QTableWidgetItem(QString::number(c));
  132.                 printTable->setItem(0,c ,newItem);
  133.             }
  134.             else    //否则，直接设置文字或者序号
  135.             {
  136.                 if (view->horizontalHeaderItem(c - 1))
  137.                     newItem->setText(view->horizontalHeaderItem(c - 1)->text());
  138.                 else
  139.                     newItem->setText(QString::number(c));
  140.             }
  141.         }
  143.     /////////////////////////求出合适的比率，用来完美表格的显示
  144.         QRect firstTable , lastTable;
  145.         QModelIndex firstIndex = printTable->model()->index(0,0);
  146.         QModelIndex lastIndex = printTable->model()->index(0,cols);
  147.         firstTable = printTable->visualRect(firstIndex);
  148.         lastTable =  printTable->visualRect(lastIndex);
  149.         float totalTableWidth = lastTable.topRight().x() - firstTable.topLeft().x();
  150.         float pagerWidth = printer->paperRect().width() - 20 - 20;
  151.         rate = totalTableWidth/pagerWidth;
  152.         cout << "totalTableWidth = " << totalTableWidth << ", pagerWidth = " << pagerWidth << ", rate = " << rate << endl;
  153.     /////////////////////////求出合适的比率，用来完美表格的显示
  155.         for(int c = 1;c < cols + 1;c++)  //重设宽度
  156.         {
  157.             printTable->setColumnWidth( c,int((view->columnWidth(c - 1))/rate) );
  158.         }
  159.         printTable->setColumnWidth(0,view->verticalHeader()->width());  //Returns the table view's vertical header.
  160.         int iRow = 0;
  161.         for(int ir = startRow[ipage]; ir <= endRow[ipage];ir++) //ir变量用来标识当前打印的是哪些行，设置当前打印页的首行
  162.         {
  163.             printTable->setRowHeight(iRow,view->rowHeight(ir));  //Sets the height of the given row to be height.
  164.             for(int ic = 0; ic < view->columnCount(); ic++)  //设置每个单元格的内容
  165.             {
  166.                 QTableWidgetItem *newItem = printTable->item(iRow  + 1,ic + 1);
  167.                 if (!newItem)
  168.                 {
  169.                     if (view->item(ir,ic))
  170.                         newItem = new QTableWidgetItem(view->item(ir,ic)->text());
  171.                     else
  172.                         newItem = new QTableWidgetItem("");
  173.                     printTable->setItem(iRow + 1,ic + 1,newItem);
  174.                 }
  175.                 else
  176.                 {
  177.                     if (view->item(ir,ic))
  178.                         newItem->setText(view->item(ir,ic)->text());
  179.                     else
  180.                         newItem->setText("");
  181.                 }
  182.             }
  183.             iRow++;
  184.         }
  185.         qreal ioffx = (area.width() - totalWidth)/2;
  186.         qreal ioffy = 50;
  187.         if (ipage == 0)
  188.         {
  189.             ioffy = 500;
  190.             QwtPlotPrintFilter filter;
  191.             int options = QwtPlotPrintFilter::PrintAll;
  192.             options &= ~QwtPlotPrintFilter::PrintBackground;
  193.             options |= QwtPlotPrintFilter::PrintFrameWithScales;
  194.             filter.setOptions(options);
  195.             d_plot->print(&painter,QRect(50,65,650,400),filter);
  197.         }
  198.         rows = printTable->rowCount();
  199.         iRow = 1;
  200.         for(int ir = startRow[ipage] ; ir <= endRow[ipage] ; ir++)  //ir变量用来标识当前打印的是哪些行，设置当前打印页的首列序号
  201.         {
  202.             QTableWidgetItem *newItem = printTable->item(iRow,0);
  203.             if (!newItem)
  204.             {
  205.                 if (view->verticalHeaderItem(ir))
  206.                     newItem = new QTableWidgetItem(view->verticalHeaderItem(ir)->text());
  207.                 else
  208.                     newItem = new QTableWidgetItem(QString::number(iRow));
  209.                 printTable->setItem(iRow,0,newItem);
  210.             }
  211.             else
  212.             {
  213.                 if (view->verticalHeaderItem(ir))
  214.                     newItem->setText(view->verticalHeaderItem(ir)->text());
  215.                 else
  216.                     newItem->setText(QString::number(iRow));
  217.             }
  218.             iRow ++;
  219.         }
  221.         QPointF offPt(20,ioffy);  //20表示边框的空格
  222.          for (int r = 0; r < rows; r++)
  223.         {
  224.             QRect rt1,rt2;
  225.             QModelIndex idx1 = printTable->model()->index(r,0);
  226.             QModelIndex idx2 = printTable->model()->index(r,cols);
  227.             rt1 = printTable->visualRect(idx1);
  228.             rt2 = printTable->visualRect(idx2);
  229.             painter.drawLine( (rt1.bottomLeft() + offPt) , (rt2.bottomRight() + offPt) );
  230.             if (r == 0)
  231.             {
  232.                 painter.drawLine( (rt1.topLeft() + offPt) , (rt2.topRight() + offPt) );
  233.             }
  234.         }
  235.         for (int c = 0; c < cols + 1; c++)
  236.         {
  237.             QRect rt1,rt2;
  238.             QModelIndex idx1 = printTable->model()->index(0,c);
  239.             QModelIndex idx2 = printTable->model()->index(rows - 1,c);
  240.             rt1 = printTable->visualRect(idx1);
  241.             rt2 = printTable->visualRect(idx2);
  242.             painter.drawLine( (rt1.topLeft() + offPt) , (rt2.bottomLeft() + offPt) );
  243.             if (c == cols)
  244.             {
  245.                 painter.drawLine( (rt1.topRight() + offPt) , (rt2.bottomRight() + offPt) );
  246.             }
  247.         }
  248.         for (int r = 0; r < rows; r++)
  249.         {
  250.             irowcount ++;
  251.             for(int c = 0; c < cols  + 1; c++)
  252.             {
  253.                 QModelIndex idx = printTable->model()->index(r,c);
  254.                 option.rect = printTable->visualRect(idx);
  255.                 if (printTable->item(r,c))
  256.                 {
  257.                     QRectF rt(option.rect.left() + 3,option.rect.top(),option.rect.width(),option.rect.height());
  258.                     rt = rt.translated(offPt);
  259.                     if (r != 0 && c == 0)
  260.                     {
  261.                         painter.drawText(rt,Qt::AlignCenter,QString("%1").arg(irowcount));
  262.                     }
  263.                     else
  264.                     {
  265.                         if (r == 0)
  266.                         {
  267.                             painter.drawText(rt,Qt::AlignCenter,printTable->item(r,c)->text());
  268.                         }
  269.                         else
  270.                         {
  271.                             painter.drawText(rt,Qt::AlignVCenter,printTable->item(r,c)->text());
  272.                         }
  273.                     }
  274.                 }
  275.             }
  276.         }
  277.         //ipage
  278.         if (ipage == 0)  //设置标题
  279.         {
  280.             QRectF rttt(area.left(),area.top(),area.width(),50);
  281.             painter.drawText(rttt,Qt::AlignCenter,stitile);
  282.         }
  283.         QRectF rttt(area.left(),area.bottom() - 65,area.width(),25);
  284.         painter.drawText(rttt,Qt::AlignCenter,QString::number(ipage + 1));
  285.         if (ipage < startRow.size() - 1)
  286.         {
  287.             printer->newPage();
  288.             irowcount--;
  289.         }
  290.     }
  291.     painter.end();
  293. }
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