mainwindow.cpp Example File

painting/fontsampler/mainwindow.cpp
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#include <QtWidgets> #if defined(QT_PRINTSUPPORT_LIB) #include <QtPrintSupport/qtprintsupportglobal.h> #if QT_CONFIG(printdialog) #include <QPrinter> #include <QPrintDialog> #if QT_CONFIG(printpreviewdialog) #include <QPrintPreviewDialog> #endif #endif #endif #include "mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { setupUi(this); sampleSizes << 32 << 24 << 16 << 14 << 12 << 8 << 4 << 2 << 1; markedCount = 0; setupFontTree(); connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit())); connect(fontTree, SIGNAL(currentItemChanged(QTreeWidgetItem*,QTreeWidgetItem*)), this, SLOT(showFont(QTreeWidgetItem*))); connect(fontTree, SIGNAL(itemChanged(QTreeWidgetItem*,int)), this, SLOT(updateStyles(QTreeWidgetItem*,int))); fontTree->setItemSelected(fontTree->topLevelItem(0), true); showFont(fontTree->topLevelItem(0)); } void MainWindow::setupFontTree() { QFontDatabase database; fontTree->setColumnCount(1); fontTree->setHeaderLabels(QStringList() << tr("Font")); foreach (QString family, database.families()) { const QStringList styles = database.styles(family); if (styles.isEmpty()) continue; QTreeWidgetItem *familyItem = new QTreeWidgetItem(fontTree); familyItem->setText(0, family); familyItem->setCheckState(0, Qt::Unchecked); familyItem->setFlags(familyItem->flags() | Qt::ItemIsAutoTristate); foreach (QString style, styles) { QTreeWidgetItem *styleItem = new QTreeWidgetItem(familyItem); styleItem->setText(0, style); styleItem->setCheckState(0, Qt::Unchecked); styleItem->setData(0, Qt::UserRole, QVariant(database.weight(family, style))); styleItem->setData(0, Qt::UserRole + 1, QVariant(database.italic(family, style))); } } } void MainWindow::on_clearAction_triggered() { QTreeWidgetItem *currentItem = fontTree->currentItem(); foreach (QTreeWidgetItem *item, fontTree->selectedItems()) fontTree->setItemSelected(item, false); fontTree->setItemSelected(currentItem, true); } void MainWindow::on_markAction_triggered() { markUnmarkFonts(Qt::Checked); } void MainWindow::on_unmarkAction_triggered() { markUnmarkFonts(Qt::Unchecked); } void MainWindow::markUnmarkFonts(Qt::CheckState state) { QList<QTreeWidgetItem *> items = fontTree->selectedItems(); foreach (QTreeWidgetItem *item, items) { if (item->checkState(0) != state) item->setCheckState(0, state); } } void MainWindow::showFont(QTreeWidgetItem *item) { if (!item) return; QString family; QString style; int weight; bool italic; if (item->parent()) { family = item->parent()->text(0); style = item->text(0); weight = item->data(0, Qt::UserRole).toInt(); italic = item->data(0, Qt::UserRole + 1).toBool(); } else { family = item->text(0); style = item->child(0)->text(0); weight = item->child(0)->data(0, Qt::UserRole).toInt(); italic = item->child(0)->data(0, Qt::UserRole + 1).toBool(); } QString oldText = textEdit->toPlainText().trimmed(); bool modified = textEdit->document()->isModified(); textEdit->clear(); QFont font(family, 32, weight, italic); font.setStyleName(style); textEdit->document()->setDefaultFont(font); QTextCursor cursor = textEdit->textCursor(); QTextBlockFormat blockFormat; blockFormat.setAlignment(Qt::AlignCenter); cursor.insertBlock(blockFormat); if (modified) cursor.insertText(QString(oldText)); else cursor.insertText(QString("%1 %2").arg(family).arg(style)); textEdit->document()->setModified(modified); } void MainWindow::updateStyles(QTreeWidgetItem *item, int column) { if (!item || column != 0) return; Qt::CheckState state = item->checkState(0); QTreeWidgetItem *parent = item->parent(); if (parent) { // Only count style items. if (state == Qt::Checked) ++markedCount; else --markedCount; } printAction->setEnabled(markedCount > 0); printPreviewAction->setEnabled(markedCount > 0); } QMap<QString, StyleItems> MainWindow::currentPageMap() { QMap<QString, StyleItems> pageMap; for (int row = 0; row < fontTree->topLevelItemCount(); ++row) { QTreeWidgetItem *familyItem = fontTree->topLevelItem(row); QString family; if (familyItem->checkState(0) == Qt::Checked) { family = familyItem->text(0); pageMap[family] = StyleItems(); } for (int childRow = 0; childRow < familyItem->childCount(); ++childRow) { QTreeWidgetItem *styleItem = familyItem->child(childRow); if (styleItem->checkState(0) == Qt::Checked) pageMap[family].append(styleItem); } } return pageMap; } void MainWindow::on_printAction_triggered() { #if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog) pageMap = currentPageMap(); if (pageMap.count() == 0) return; QPrinter printer(QPrinter::HighResolution); QPrintDialog dialog(&printer, this); if (dialog.exec() != QDialog::Accepted) return; int from = printer.fromPage(); int to = printer.toPage(); if (from <= 0 && to <= 0) printer.setFromTo(1, pageMap.keys().count()); printDocument(&printer); #endif } void MainWindow::printDocument(QPrinter *printer) { #if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog) printer->setFromTo(1, pageMap.count()); QProgressDialog progress(tr("Preparing font samples..."), tr("&Cancel"), 0, pageMap.count(), this); progress.setWindowModality(Qt::ApplicationModal); progress.setWindowTitle(tr("Font Sampler")); progress.setMinimum(printer->fromPage() - 1); progress.setMaximum(printer->toPage()); QPainter painter; painter.begin(printer); bool firstPage = true; for (int page = printer->fromPage(); page <= printer->toPage(); ++page) { if (!firstPage) printer->newPage(); qApp->processEvents(); if (progress.wasCanceled()) break; printPage(page - 1, &painter, printer); progress.setValue(page); firstPage = false; } painter.end(); #endif } void MainWindow::on_printPreviewAction_triggered() { #if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printpreviewdialog) pageMap = currentPageMap(); if (pageMap.count() == 0) return; QPrinter printer(QPrinter::HighResolution); QPrintPreviewDialog preview(&printer, this); connect(&preview, SIGNAL(paintRequested(QPrinter*)), this, SLOT(printDocument(QPrinter*))); preview.exec(); #endif } void MainWindow::printPage(int index, QPainter *painter, QPrinter *printer) { #if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog) QString family = pageMap.keys()[index]; StyleItems items = pageMap[family]; // Find the dimensions of the text on each page. qreal width = 0.0; qreal height = 0.0; foreach (QTreeWidgetItem *item, items) { QString style = item->text(0); int weight = item->data(0, Qt::UserRole).toInt(); bool italic = item->data(0, Qt::UserRole + 1).toBool(); // Calculate the maximum width and total height of the text. foreach (int size, sampleSizes) { QFont font(family, size, weight, italic); font.setStyleName(style); font = QFont(font, painter->device()); QFontMetricsF fontMetrics(font); QRectF rect = fontMetrics.boundingRect( QString("%1 %2").arg(family).arg(style)); width = qMax(rect.width(), width); height += rect.height(); } } qreal xScale = printer->pageRect().width() / width; qreal yScale = printer->pageRect().height() / height; qreal scale = qMin(xScale, yScale); qreal remainingHeight = printer->pageRect().height()/scale - height; qreal spaceHeight = (remainingHeight / 4.0) / (items.count() + 1); qreal interLineHeight = (remainingHeight / 4.0) / (sampleSizes.count() * items.count()); painter->save(); painter->translate(printer->pageRect().width() / 2.0, printer->pageRect().height() / 2.0); painter->scale(scale, scale); painter->setBrush(QBrush(Qt::black)); qreal x = -width / 2.0; qreal y = -height / 2.0 - remainingHeight / 4.0 + spaceHeight; foreach (QTreeWidgetItem *item, items) { QString style = item->text(0); int weight = item->data(0, Qt::UserRole).toInt(); bool italic = item->data(0, Qt::UserRole + 1).toBool(); // Draw each line of text. foreach (int size, sampleSizes) { QFont font(family, size, weight, italic); font.setStyleName(style); font = QFont(font, painter->device()); QFontMetricsF fontMetrics(font); QRectF rect = fontMetrics.boundingRect(QString("%1 %2").arg( font.family()).arg(style)); y += rect.height(); painter->setFont(font); painter->drawText(QPointF(x, y), QString("%1 %2").arg(family).arg(style)); y += interLineHeight; } y += spaceHeight; } painter->restore(); #endif }