Long live Qt 4.5!

1 files changed, 373 insertions, 0 deletions

diff --git a/examples/painting/fontsampler/mainwindow.cpp b/examples/painting/fontsampler/mainwindow.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#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);
+
+        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();
+    textEdit->document()->setDefaultFont(QFont(family, 32, weight, italic));
+
+    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;
+
+        if (state == Qt::Checked &&
+            parent->checkState(0) == Qt::Unchecked) {
+            // Mark parent items when child items are checked.
+            parent->setCheckState(0, Qt::Checked);
+
+        } else if (state == Qt::Unchecked &&
+                   parent->checkState(0) == Qt::Checked) {
+
+            bool marked = false;
+            for (int row = 0; row < parent->childCount(); ++row) {
+                if (parent->child(row)->checkState(0) == Qt::Checked) {
+                    marked = true;
+                    break;
+                }
+            }
+            // Unmark parent items when all child items are unchecked.
+            if (!marked)
+                parent->setCheckState(0, Qt::Unchecked);
+        }
+    } else {
+        int row;
+        int number = 0;
+        for (row = 0; row < item->childCount(); ++row) {
+            if (item->child(row)->checkState(0) == Qt::Checked)
+                ++number;
+        }
+
+        // Mark/unmark all child items when marking/unmarking top-level
+        // items.
+        if (state == Qt::Checked && number == 0) {
+            for (row = 0; row < item->childCount(); ++row) {
+                if (item->child(row)->checkState(0) == Qt::Unchecked)
+                    item->child(row)->setCheckState(0, Qt::Checked);
+            }
+        } else if (state == Qt::Unchecked && number > 0) {
+            for (row = 0; row < item->childCount(); ++row) {
+                if (item->child(row)->checkState(0) == Qt::Checked)
+                    item->child(row)->setCheckState(0, Qt::Unchecked);
+            }
+        }
+    }
+
+    printAction->setEnabled(markedCount > 0);
+    printPreviewAction->setEnabled(markedCount > 0);
+}
+
+void MainWindow::on_printAction_triggered()
+{
+    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);
+}
+
+void MainWindow::printDocument(QPrinter *printer)
+{
+    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();
+}
+
+void MainWindow::on_printPreviewAction_triggered()
+{
+    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();
+}
+
+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::printPage(int index, QPainter *painter, QPrinter *printer)
+{
+    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 = 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 = 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();
+}