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Diffstat (limited to 'examples/pdf/pdfviewer/mainwindow.cpp')
| -rw-r--r-- | examples/pdf/pdfviewer/mainwindow.cpp | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/examples/pdf/pdfviewer/mainwindow.cpp b/examples/pdf/pdfviewer/mainwindow.cpp new file mode 100644 index 0000000..d865a8b --- /dev/null +++ b/examples/pdf/pdfviewer/mainwindow.cpp @@ -0,0 +1,170 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the QtPDF module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL3$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see http://www.qt.io/terms-conditions. For further +** information use the contact form at http://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPLv3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or later 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 2.0 requirements will be +** met: http://www.gnu.org/licenses/gpl-2.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "mainwindow.h" +#include "ui_mainwindow.h" + +#include "sequentialpagewidget.h" + +#include <QFileDialog> +#include <QLineEdit> +#include <QMessageBox> +#include <QPdfDocument> +#include <QScroller> +#include <QtMath> + +const qreal zoomMultiplier = qSqrt(2.0); + +Q_LOGGING_CATEGORY(lcExample, "qt.examples.pdfviewer") + +MainWindow::MainWindow(QWidget *parent) + : QMainWindow(parent) + , ui(new Ui::MainWindow) + , m_pageWidget(new SequentialPageWidget(this)) + , m_zoomEdit(new QLineEdit(this)) + , m_pageEdit(new QLineEdit(this)) + , m_document(new QPdfDocument(this)) +{ + ui->setupUi(this); + ui->scrollArea->setWidget(m_pageWidget); + m_zoomEdit->setMaximumWidth(50); + m_zoomEdit->setAlignment(Qt::AlignHCenter); + ui->mainToolBar->insertWidget(ui->actionZoom_In, m_zoomEdit); + m_pageEdit->setMaximumWidth(50); + m_pageEdit->setAlignment(Qt::AlignHCenter); + ui->mainToolBar->insertWidget(ui->actionGo, m_pageEdit); + connect(m_pageWidget, SIGNAL(showingPageRange(int,int)), + this, SLOT(showingPageRange(int,int)), Qt::QueuedConnection); + connect(m_pageWidget, SIGNAL(zoomChanged(qreal)), + this, SLOT(zoomChanged(qreal))); + connect(m_zoomEdit, SIGNAL(returnPressed()), this, SLOT(zoomEdited())); + connect(m_pageEdit, SIGNAL(returnPressed()), this, SLOT(on_actionGo_triggered())); + + QScroller::grabGesture(ui->scrollArea); + + m_pageWidget->setDocument(m_document); +} + +MainWindow::~MainWindow() +{ + delete ui; +} + +void MainWindow::open(const QUrl &docLocation) +{ + if (docLocation.isLocalFile()) { + m_document->load(docLocation.toLocalFile()); + } else { + qCDebug(lcExample) << docLocation << "is not a valid local file"; + QMessageBox::critical(this, tr("Failed to open"), tr("%1 is not a valid local file").arg(docLocation.toString())); + } + qCDebug(lcExample) << docLocation; + ui->scrollArea->ensureVisible(0, 0, 0, 0); +} + +void MainWindow::showingPageRange(int start, int end) +{ + ui->statusBar->clearMessage(); + if (start == end) + ui->statusBar->showMessage(tr("showing page %1").arg(start)); + else + ui->statusBar->showMessage(tr("showing pages %1 to %2").arg(start).arg(end)); + m_pageEdit->setText(QString::number(end)); +} + +void MainWindow::zoomChanged(qreal factor) +{ + m_zoomEdit->setText(tr("%1%").arg(factor * 100., 0, 'f', 0)); +} + +void MainWindow::zoomEdited() +{ + bool ok = false; + qreal factor = m_zoomEdit->text().remove(QChar('%')).toDouble(&ok); + if (ok) + m_pageWidget->setZoom(factor / 100.); +} + +void MainWindow::on_actionOpen_triggered() +{ + QUrl toOpen = QFileDialog::getOpenFileUrl(this, tr("Choose a PDF"), QUrl(), "Portable Documents (*.pdf)"); + if (toOpen.isValid()) + open(toOpen); +} + +void MainWindow::on_actionQuit_triggered() +{ + QApplication::quit(); +} + +void MainWindow::on_actionAbout_triggered() +{ + QMessageBox::about(this, tr("About PdfViewer"), + tr("An example using QPdfDocument")); +} + +void MainWindow::on_actionAbout_Qt_triggered() +{ + QMessageBox::aboutQt(this); +} + +void MainWindow::on_actionZoom_In_triggered() +{ + m_pageWidget->setZoom(m_pageWidget->zoom() * zoomMultiplier); +} + +void MainWindow::on_actionZoom_Out_triggered() +{ + m_pageWidget->setZoom(m_pageWidget->zoom() / zoomMultiplier); +} + +void MainWindow::on_actionGo_triggered() +{ + bool ok = false; + int page = m_pageEdit->text().toInt(&ok); + if (!ok) return; + ui->scrollArea->ensureVisible(0, m_pageWidget->yForPage(page)); +} + +void MainWindow::on_actionPrevious_Page_triggered() +{ + ui->scrollArea->ensureVisible(0, m_pageWidget->yForPage(m_pageWidget->topPageShowing() - 1)); +} + +void MainWindow::on_actionNext_Page_triggered() +{ + ui->scrollArea->ensureVisible(0, m_pageWidget->yForPage(m_pageWidget->bottomPageShowing() + 1)); +} |