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Print: improve table printing by using QTableView
The current QTextDocument implementation is slow due to HTML parsing. By using QTableView with QAbstractTableModel we boost the performance of the table print drastically. This patch completely replaces the old solution. There is a hidden QTableView widget which is populated with all data and rendered using a QPainter attached to the printer device. A couple of new classes are added in models.h/cpp that handle the table print model and these are then used in printlayout.h/cpp. Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com> Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Lubomir I. Ivanov
Dirk Hohndel
parent
1f976371bf
commit
e5b18db802
4 changed files with 259 additions and 132 deletions
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@ -1,9 +1,10 @@
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#include <QtCore/qmath.h>
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#include <QDebug>
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#include <QPainter>
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#include <QDesktopWidget>
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#include <QApplication>
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#include <QTextDocument>
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#include <QAbstractTextDocumentLayout>
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#include <QTableView>
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#include <QHeaderView>
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#include "mainwindow.h"
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#include "profilegraphics.h"
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#include "printlayout.h"
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@ -21,8 +22,6 @@ struct options {
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};
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*/
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#define TABLE_PRINT_COL 7
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PrintLayout::PrintLayout(PrintDialog *dialogPtr, QPrinter *printerPtr, struct options *optionsPtr)
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{
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dialog = dialogPtr;
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@ -30,20 +29,21 @@ PrintLayout::PrintLayout(PrintDialog *dialogPtr, QPrinter *printerPtr, struct op
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printOptions = optionsPtr;
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// table print settings
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tableColumnNames.append(tr("Dive#"));
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tableColumnNames.append(tr("Date"));
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tableColumnNames.append(tr("Depth"));
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tableColumnNames.append(tr("Duration"));
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tableColumnNames.append(tr("Master"));
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tableColumnNames.append(tr("Buddy"));
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tableColumnNames.append(tr("Location"));
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tableColumnWidths.append("7");
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tableColumnWidths.append("10");
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tableColumnWidths.append("10");
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tableColumnWidths.append("10");
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tableColumnWidths.append("15");
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tableColumnWidths.append("15");
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tableColumnWidths.append("100");
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tablePrintHeadingBackground = 0xffeeeeee;
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tablePrintColumnNames.append(tr("Dive#"));
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tablePrintColumnNames.append(tr("Date"));
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tablePrintColumnNames.append(tr("Depth"));
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tablePrintColumnNames.append(tr("Duration"));
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tablePrintColumnNames.append(tr("Master"));
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tablePrintColumnNames.append(tr("Buddy"));
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tablePrintColumnNames.append(tr("Location"));
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tablePrintColumnWidths.append(7);
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tablePrintColumnWidths.append(10);
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tablePrintColumnWidths.append(10);
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tablePrintColumnWidths.append(10);
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tablePrintColumnWidths.append(15);
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tablePrintColumnWidths.append(15);
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tablePrintColumnWidths.append(33);
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}
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void PrintLayout::print()
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@ -74,6 +74,10 @@ void PrintLayout::setup()
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scaleX = (qreal)printerDpi/(qreal)screenDpiX;
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scaleY = (qreal)printerDpi/(qreal)screenDpiY;
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// a printer page scalled to screen DPI
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scaledPageW = pageRect.width() / scaleX;
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scaledPageH = pageRect.height() / scaleY;
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}
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// experimental
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@ -90,7 +94,7 @@ void PrintLayout::printSixDives() const
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profile->clear();
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profile->setPrintMode(true, !printOptions->color_selected);
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QSize originalSize = profile->size();
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profile->resize(pageRect.height()/scaleY, pageRect.width()/scaleX);
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profile->resize(scaledPageW, scaledPageH);
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int i;
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struct dive *dive;
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@ -122,127 +126,100 @@ void PrintLayout::printTwoDives() const
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// nop
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}
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void PrintLayout::printTable() const
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void PrintLayout::printTable()
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{
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QTextDocument doc;
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QSizeF pageSize;
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pageSize.setWidth(pageRect.width());
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pageSize.setHeight(pageRect.height());
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doc.documentLayout()->setPaintDevice(printer);
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doc.setPageSize(pageSize);
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// create and setup a table
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QTableView table;
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table.setAttribute(Qt::WA_DontShowOnScreen);
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table.setSelectionMode(QAbstractItemView::NoSelection);
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table.setFocusPolicy(Qt::NoFocus);
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table.horizontalHeader()->setVisible(false);
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table.horizontalHeader()->setResizeMode(QHeaderView::Fixed);
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table.verticalHeader()->setVisible(false);
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table.verticalHeader()->setResizeMode(QHeaderView::ResizeToContents);
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table.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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table.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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// fit table to one page initially
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table.resize(scaledPageW, scaledPageH);
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QString styleSheet(
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"<style type='text/css'>"
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"table {"
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" border-width: 1px;"
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" border-style: solid;"
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" border-color: #999999;"
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"}"
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"th {"
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" background-color: #eeeeee;"
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" font-size: small;"
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" padding: 3px 5px 3px 5px;"
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"}"
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"td {"
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" font-size: small;"
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" padding: 3px 5px 3px 5px;"
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"}"
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"</style>"
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);
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// setDefaultStyleSheet() doesn't work here?
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const QString heading(insertTableHeadingRow());
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const QString lineBreak("<br>");
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QString htmlText = styleSheet + "<table cellspacing='0' width='100%'>";
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QString htmlTextPrev;
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int pageCountNew = 1, pageCount = 0, lastPageWithHeading = 0;
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bool insertHeading = true;
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int i;
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// create and fill a table model
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TablePrintModel model;
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struct dive *dive;
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int i, row = 0;
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addTablePrintHeadingRow(&model, row); // add one heading row
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row++;
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for_each_dive(i, dive) {
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if (!dive->selected && printOptions->print_selected)
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continue;
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if (insertHeading) {
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htmlTextPrev = htmlText;
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htmlText += heading;
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doc.setHtml(htmlText);
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pageCount = doc.pageCount();
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// prevent adding two headings on the same page
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if (pageCount == lastPageWithHeading) {
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htmlText = htmlTextPrev;
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// add line breaks until a new page is reached
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while (pageCount == lastPageWithHeading) {
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htmlTextPrev = htmlText;
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htmlText += lineBreak;
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doc.setHtml(htmlText);
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pageCount = doc.pageCount();
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}
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// revert last line break from the new page and add heading
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htmlText = htmlTextPrev;
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htmlText += heading;
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}
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insertHeading = false;
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lastPageWithHeading = pageCount;
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}
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htmlTextPrev = htmlText;
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htmlText += insertTableDataRow(dive);
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doc.setHtml(htmlText);
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pageCount = pageCountNew;
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pageCountNew = doc.pageCount();
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// if the page count increases revert and add heading instead
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if (pageCountNew > pageCount) {
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htmlText = htmlTextPrev;
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insertHeading = true;
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addTablePrintDataRow(&model, row, dive);
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row++;
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}
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table.setModel(&model); // set model to table
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// resize columns to percentages from page width
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for (int i = 0; i < model.columns; i++) {
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int pw = qCeil((qreal)(tablePrintColumnWidths.at(i) * table.width()) / 100);
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table.horizontalHeader()->resizeSection(i, pw);
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}
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// reset the model at this point
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model.callReset();
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// a list of vertical offsets where pages begin and some helpers
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QList<unsigned int> pageIndexes;
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pageIndexes.append(0);
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int tableHeight = 0, rowH = 0, accH = 0;
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// process all rows
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for (int i = 0; i < model.rows; i++) {
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rowH = table.rowHeight(i);
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accH += rowH;
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if (accH > scaledPageH) { // push a new page index and add a heading
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pageIndexes.append(pageIndexes.last() + (accH - rowH));
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addTablePrintHeadingRow(&model, i);
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accH = 0;
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i--;
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}
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tableHeight += rowH;
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}
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pageIndexes.append(pageIndexes.last() + accH);
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// resize the whole widget so that it can be rendered
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table.resize(scaledPageW, tableHeight);
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// attach a painter and render pages by using pageIndexes
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QPainter painter(printer);
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painter.setRenderHint(QPainter::Antialiasing);
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painter.setRenderHint(QPainter::SmoothPixmapTransform);
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painter.scale(scaleX, scaleY);
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for (int i = 0; i < pageIndexes.size() - 1; i++) {
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if (i > 0)
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printer->newPage();
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QRegion region(0, pageIndexes.at(i) - 1,
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table.width(),
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pageIndexes.at(i + 1) - pageIndexes.at(i) + 2);
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table.render(&painter, QPoint(0, 0), region);
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}
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htmlText += "</table>";
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doc.setHtml(htmlText);
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doc.print(printer);
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}
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QString PrintLayout::insertTableHeadingRow() const
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void PrintLayout::addTablePrintDataRow(TablePrintModel *model, int row, struct dive *dive) const
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{
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int i;
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QString ret("<tr>");
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for (i = 0; i < TABLE_PRINT_COL; i++)
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ret += insertTableHeadingCol(i);
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ret += "</tr>";
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return ret;
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}
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QString PrintLayout::insertTableHeadingCol(int col) const
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{
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QString ret("<th align='left' width='");
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ret += tableColumnWidths.at(col);
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ret += "%'>";
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ret += tableColumnNames.at(col);
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ret += "</th>";
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return ret;
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}
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QString PrintLayout::insertTableDataRow(struct dive *dive) const
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{
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// use the DiveItem class
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struct DiveItem di;
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di.dive = dive;
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// fill row
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QString ret("<tr>");
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ret += insertTableDataCol(QString::number(dive->number));
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ret += insertTableDataCol(di.displayDate());
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ret += insertTableDataCol(di.displayDepth());
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ret += insertTableDataCol(di.displayDuration());
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ret += insertTableDataCol(dive->divemaster);
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ret += insertTableDataCol(dive->buddy);
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ret += insertTableDataCol(dive->location);
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ret += "</tr>";
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return ret;
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model->insertRow();
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model->setData(model->index(row, 0), QString::number(dive->number), Qt::DisplayRole);
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model->setData(model->index(row, 1), di.displayDate(), Qt::DisplayRole);
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model->setData(model->index(row, 2), di.displayDepth(), Qt::DisplayRole);
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model->setData(model->index(row, 3), di.displayDuration(), Qt::DisplayRole);
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model->setData(model->index(row, 4), dive->divemaster, Qt::DisplayRole);
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model->setData(model->index(row, 5), dive->buddy, Qt::DisplayRole);
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model->setData(model->index(row, 6), dive->location, Qt::DisplayRole);
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}
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QString PrintLayout::insertTableDataCol(QString data) const
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void PrintLayout::addTablePrintHeadingRow(TablePrintModel *model, int row) const
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{
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return "<td>" + data + "</td>";
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model->insertRow(row);
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for (int i = 0; i < model->columns; i++) {
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model->setData(model->index(row, i), tablePrintColumnNames.at(i), Qt::DisplayRole);
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model->setData(model->index(row, i), tablePrintHeadingBackground, Qt::BackgroundRole);
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}
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}
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// experimental
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