Rename the widget browser example demobrowser

The browser example already uses the name demobrowser internally, this
changes the external name to make it easier to refer to explicitly, and
avoid users thinking fancybrowser is the better example.

Change-Id: Ic093eb4881352b5f796bf565df01edb929aba39c
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

1 files changed, 496 insertions, 0 deletions

diff --git a/examples/webenginewidgets/demobrowser/downloadmanager.cpp b/examples/webenginewidgets/demobrowser/downloadmanager.cpp
new file mode 100644
index 000000000..eab28942e
--- /dev/null
+++ b/examples/webenginewidgets/demobrowser/downloadmanager.cpp
@@ -0,0 +1,496 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 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.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "downloadmanager.h"
+
+#include "autosaver.h"
+#include "browserapplication.h"
+
+#include <math.h>
+
+#include <QtCore/QMetaEnum>
+#include <QtCore/QSettings>
+
+#include <QtGui/QDesktopServices>
+#include <QtWidgets/QFileDialog>
+#include <QtWidgets/QHeaderView>
+#include <QtWidgets/QFileIconProvider>
+
+#include <QtCore/QDebug>
+
+#include <QWebEngineSettings>
+#include <QWebEngineDownloadItem>
+
+/*!
+    DownloadWidget is a widget that is displayed in the download manager list.
+    It moves the data from the QWebEngineDownloadItem into the QFile as well
+    as update the information/progressbar and report errors.
+ */
+
+DownloadWidget::DownloadWidget(QWebEngineDownloadItem *download, QWidget *parent)
+    : QWidget(parent)
+    , m_bytesReceived(0)
+    , m_download(download)
+{
+    setupUi(this);
+    QPalette p = downloadInfoLabel->palette();
+    p.setColor(QPalette::Text, Qt::darkGray);
+    downloadInfoLabel->setPalette(p);
+    progressBar->setMaximum(0);
+    connect(stopButton, SIGNAL(clicked()), this, SLOT(stop()));
+    connect(openButton, SIGNAL(clicked()), this, SLOT(open()));
+
+    if (download) {
+        m_file.setFile(download->path());
+        m_url = download->url();
+    }
+
+    init();
+}
+
+void DownloadWidget::init()
+{
+    if (m_download) {
+        connect(m_download.data(), SIGNAL(downloadProgress(qint64,qint64)),
+                this, SLOT(downloadProgress(qint64,qint64)));
+        connect(m_download.data(), SIGNAL(finished()),
+                this, SLOT(finished()));
+    }
+
+    // reset info
+    downloadInfoLabel->clear();
+    progressBar->setValue(0);
+    getFileName();
+
+    // start timer for the download estimation
+    m_downloadTime.start();
+}
+
+bool DownloadWidget::getFileName(bool promptForFileName)
+{
+    QSettings settings;
+    settings.beginGroup(QLatin1String("downloadmanager"));
+    QString defaultLocation = QStandardPaths::writableLocation(QStandardPaths::DesktopLocation);
+    if (m_file.absoluteDir().exists())
+        defaultLocation = m_file.absolutePath();
+    QString downloadDirectory = settings.value(QLatin1String("downloadDirectory"), defaultLocation).toString();
+    if (!downloadDirectory.isEmpty())
+        downloadDirectory += QLatin1Char('/');
+
+    QString defaultFileName = QFileInfo(downloadDirectory, m_file.fileName()).absoluteFilePath();
+    QString fileName = defaultFileName;
+    if (promptForFileName) {
+        fileName = QFileDialog::getSaveFileName(this, tr("Save File"), defaultFileName);
+        if (fileName.isEmpty()) {
+            if (m_download)
+                m_download->cancel();
+            fileNameLabel->setText(tr("Download canceled: %1").arg(QFileInfo(defaultFileName).fileName()));
+            return false;
+        }
+    }
+    m_file.setFile(fileName);
+
+    if (m_download && m_download->state() == QWebEngineDownloadItem::DownloadRequested)
+        m_download->setPath(m_file.absoluteFilePath());
+
+    fileNameLabel->setText(m_file.fileName());
+    return true;
+}
+
+void DownloadWidget::stop()
+{
+    setUpdatesEnabled(false);
+    stopButton->setEnabled(false);
+    stopButton->hide();
+    setUpdatesEnabled(true);
+    if (m_download)
+        m_download->cancel();
+
+    emit statusChanged();
+}
+
+void DownloadWidget::open()
+{
+    QUrl url = QUrl::fromLocalFile(m_file.absolutePath());
+    QDesktopServices::openUrl(url);
+}
+
+void DownloadWidget::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
+{
+    m_bytesReceived = bytesReceived;
+    if (bytesTotal == -1) {
+        progressBar->setValue(0);
+        progressBar->setMaximum(0);
+    } else {
+        progressBar->setValue(bytesReceived);
+        progressBar->setMaximum(bytesTotal);
+    }
+    updateInfoLabel();
+}
+
+void DownloadWidget::updateInfoLabel()
+{
+    qint64 bytesTotal = progressBar->maximum();
+
+    // update info label
+    double speed = m_bytesReceived * 1000.0 / m_downloadTime.elapsed();
+    double timeRemaining = ((double)(bytesTotal - m_bytesReceived)) / speed;
+    QString timeRemainingString = tr("seconds");
+    if (timeRemaining > 60) {
+        timeRemaining = timeRemaining / 60;
+        timeRemainingString = tr("minutes");
+    }
+    timeRemaining = floor(timeRemaining);
+
+    // When downloading the eta should never be 0
+    if (timeRemaining == 0)
+        timeRemaining = 1;
+
+    QString info;
+    if (!downloadedSuccessfully()) {
+        QString remaining;
+        if (bytesTotal != 0)
+            remaining = tr("- %4 %5 remaining")
+            .arg(timeRemaining)
+            .arg(timeRemainingString);
+        info = tr("%1 of %2 (%3/sec) %4")
+            .arg(dataString(m_bytesReceived))
+            .arg(bytesTotal == 0 ? tr("?") : dataString(bytesTotal))
+            .arg(dataString((int)speed))
+            .arg(remaining);
+    } else {
+        if (m_bytesReceived != bytesTotal) {
+            info = tr("%1 of %2 - Stopped")
+                .arg(dataString(m_bytesReceived))
+                .arg(dataString(bytesTotal));
+        } else
+            info = dataString(m_bytesReceived);
+    }
+    downloadInfoLabel->setText(info);
+}
+
+QString DownloadWidget::dataString(int size) const
+{
+    QString unit;
+    if (size < 1024) {
+        unit = tr("bytes");
+    } else if (size < 1024*1024) {
+        size /= 1024;
+        unit = tr("kB");
+    } else {
+        size /= 1024*1024;
+        unit = tr("MB");
+    }
+    return QString(QLatin1String("%1 %2")).arg(size).arg(unit);
+}
+
+bool DownloadWidget::downloading() const
+{
+    return (progressBar->isVisible());
+}
+
+bool DownloadWidget::downloadedSuccessfully() const
+{
+    bool completed = m_download
+            && m_download->isFinished()
+            && m_download->state() == QWebEngineDownloadItem::DownloadCompleted;
+    return completed || !stopButton->isVisible();
+}
+
+void DownloadWidget::finished()
+{
+    if (m_download) {
+        QWebEngineDownloadItem::DownloadState state = m_download->state();
+        QString message;
+        bool interrupted = false;
+
+        switch (state) {
+        case QWebEngineDownloadItem::DownloadRequested: // Fall-through.
+        case QWebEngineDownloadItem::DownloadInProgress:
+            Q_UNREACHABLE();
+            break;
+        case QWebEngineDownloadItem::DownloadCompleted:
+            break;
+        case QWebEngineDownloadItem::DownloadCancelled:
+            message = QStringLiteral("Download cancelled");
+            interrupted = true;
+            break;
+        case QWebEngineDownloadItem::DownloadInterrupted:
+            message = QStringLiteral("Download interrupted");
+            interrupted = true;
+            break;
+        }
+
+        if (interrupted) {
+            downloadInfoLabel->setText(message);
+            return;
+        }
+    }
+
+    progressBar->hide();
+    stopButton->setEnabled(false);
+    stopButton->hide();
+    updateInfoLabel();
+    emit statusChanged();
+}
+
+/*!
+    DownloadManager is a Dialog that contains a list of DownloadWidgets
+
+    It is a basic download manager.  It only downloads the file, doesn't do BitTorrent,
+    extract zipped files or anything fancy.
+  */
+DownloadManager::DownloadManager(QWidget *parent)
+    : QDialog(parent)
+    , m_autoSaver(new AutoSaver(this))
+    , m_iconProvider(0)
+    , m_removePolicy(Never)
+{
+    setupUi(this);
+    downloadsView->setShowGrid(false);
+    downloadsView->verticalHeader()->hide();
+    downloadsView->horizontalHeader()->hide();
+    downloadsView->setAlternatingRowColors(true);
+    downloadsView->horizontalHeader()->setStretchLastSection(true);
+    m_model = new DownloadModel(this);
+    downloadsView->setModel(m_model);
+    connect(cleanupButton, SIGNAL(clicked()), this, SLOT(cleanup()));
+    load();
+}
+
+DownloadManager::~DownloadManager()
+{
+    m_autoSaver->changeOccurred();
+    m_autoSaver->saveIfNeccessary();
+    if (m_iconProvider)
+        delete m_iconProvider;
+}
+
+int DownloadManager::activeDownloads() const
+{
+    int count = 0;
+    for (int i = 0; i < m_downloads.count(); ++i) {
+        if (m_downloads.at(i)->stopButton->isEnabled())
+            ++count;
+    }
+    return count;
+}
+
+void DownloadManager::download(QWebEngineDownloadItem *download)
+{
+    DownloadWidget *widget = new DownloadWidget(download, this);
+    addItem(widget);
+}
+
+void DownloadManager::addItem(DownloadWidget *widget)
+{
+    connect(widget, SIGNAL(statusChanged()), this, SLOT(updateRow()));
+    int row = m_downloads.count();
+    m_model->beginInsertRows(QModelIndex(), row, row);
+    m_downloads.append(widget);
+    m_model->endInsertRows();
+    updateItemCount();
+    if (row == 0)
+        show();
+    downloadsView->setIndexWidget(m_model->index(row, 0), widget);
+    QIcon icon = style()->standardIcon(QStyle::SP_FileIcon);
+    widget->fileIcon->setPixmap(icon.pixmap(48, 48));
+    downloadsView->setRowHeight(row, widget->sizeHint().height());
+}
+
+void DownloadManager::updateRow()
+{
+    DownloadWidget *widget = qobject_cast<DownloadWidget*>(sender());
+    int row = m_downloads.indexOf(widget);
+    if (-1 == row)
+        return;
+    if (!m_iconProvider)
+        m_iconProvider = new QFileIconProvider();
+    QIcon icon = m_iconProvider->icon(widget->m_file);
+    if (icon.isNull())
+        icon = style()->standardIcon(QStyle::SP_FileIcon);
+    widget->fileIcon->setPixmap(icon.pixmap(48, 48));
+    downloadsView->setRowHeight(row, widget->minimumSizeHint().height());
+
+    bool remove = false;
+    if (!widget->downloading()
+        && BrowserApplication::instance()->privateBrowsing())
+        remove = true;
+
+    if (widget->downloadedSuccessfully()
+        && removePolicy() == DownloadManager::SuccessFullDownload) {
+        remove = true;
+    }
+    if (remove)
+        m_model->removeRow(row);
+
+    cleanupButton->setEnabled(m_downloads.count() - activeDownloads() > 0);
+}
+
+DownloadManager::RemovePolicy DownloadManager::removePolicy() const
+{
+    return m_removePolicy;
+}
+
+void DownloadManager::setRemovePolicy(RemovePolicy policy)
+{
+    if (policy == m_removePolicy)
+        return;
+    m_removePolicy = policy;
+    m_autoSaver->changeOccurred();
+}
+
+void DownloadManager::save() const
+{
+    QSettings settings;
+    settings.beginGroup(QLatin1String("downloadmanager"));
+    QMetaEnum removePolicyEnum = staticMetaObject.enumerator(staticMetaObject.indexOfEnumerator("RemovePolicy"));
+    settings.setValue(QLatin1String("removeDownloadsPolicy"), QLatin1String(removePolicyEnum.valueToKey(m_removePolicy)));
+    settings.setValue(QLatin1String("size"), size());
+    if (m_removePolicy == Exit)
+        return;
+
+    for (int i = 0; i < m_downloads.count(); ++i) {
+        QString key = QString(QLatin1String("download_%1_")).arg(i);
+        settings.setValue(key + QLatin1String("url"), m_downloads[i]->m_url);
+        settings.setValue(key + QLatin1String("location"), m_downloads[i]->m_file.filePath());
+        settings.setValue(key + QLatin1String("done"), m_downloads[i]->downloadedSuccessfully());
+    }
+    int i = m_downloads.count();
+    QString key = QString(QLatin1String("download_%1_")).arg(i);
+    while (settings.contains(key + QLatin1String("url"))) {
+        settings.remove(key + QLatin1String("url"));
+        settings.remove(key + QLatin1String("location"));
+        settings.remove(key + QLatin1String("done"));
+        key = QString(QLatin1String("download_%1_")).arg(++i);
+    }
+}
+
+void DownloadManager::load()
+{
+    QSettings settings;
+    settings.beginGroup(QLatin1String("downloadmanager"));
+    QSize size = settings.value(QLatin1String("size")).toSize();
+    if (size.isValid())
+        resize(size);
+    QByteArray value = settings.value(QLatin1String("removeDownloadsPolicy"), QLatin1String("Never")).toByteArray();
+    QMetaEnum removePolicyEnum = staticMetaObject.enumerator(staticMetaObject.indexOfEnumerator("RemovePolicy"));
+    m_removePolicy = removePolicyEnum.keyToValue(value) == -1 ?
+                        Never :
+                        static_cast<RemovePolicy>(removePolicyEnum.keyToValue(value));
+
+    int i = 0;
+    QString key = QString(QLatin1String("download_%1_")).arg(i);
+    while (settings.contains(key + QLatin1String("url"))) {
+        QUrl url = settings.value(key + QLatin1String("url")).toUrl();
+        QString fileName = settings.value(key + QLatin1String("location")).toString();
+        bool done = settings.value(key + QLatin1String("done"), true).toBool();
+        if (done && !url.isEmpty() && !fileName.isEmpty()) {
+            DownloadWidget *widget = new DownloadWidget(0, this);
+            widget->m_file.setFile(fileName);
+            widget->fileNameLabel->setText(widget->m_file.fileName());
+            widget->m_url = url;
+            widget->stopButton->setVisible(false);
+            widget->stopButton->setEnabled(false);
+            widget->progressBar->hide();
+            addItem(widget);
+        }
+        key = QString(QLatin1String("download_%1_")).arg(++i);
+    }
+    cleanupButton->setEnabled(m_downloads.count() - activeDownloads() > 0);
+}
+
+void DownloadManager::cleanup()
+{
+    if (m_downloads.isEmpty())
+        return;
+    m_model->removeRows(0, m_downloads.count());
+    updateItemCount();
+    if (m_downloads.isEmpty() && m_iconProvider) {
+        delete m_iconProvider;
+        m_iconProvider = 0;
+    }
+    m_autoSaver->changeOccurred();
+}
+
+void DownloadManager::updateItemCount()
+{
+    int count = m_downloads.count();
+    itemCount->setText(count == 1 ? tr("1 Download") : tr("%1 Downloads").arg(count));
+}
+
+DownloadModel::DownloadModel(DownloadManager *downloadManager, QObject *parent)
+    : QAbstractListModel(parent)
+    , m_downloadManager(downloadManager)
+{
+}
+
+QVariant DownloadModel::data(const QModelIndex &index, int role) const
+{
+    if (index.row() < 0 || index.row() >= rowCount(index.parent()))
+        return QVariant();
+    if (role == Qt::ToolTipRole)
+        if (!m_downloadManager->m_downloads.at(index.row())->downloadedSuccessfully())
+            return m_downloadManager->m_downloads.at(index.row())->downloadInfoLabel->text();
+    return QVariant();
+}
+
+int DownloadModel::rowCount(const QModelIndex &parent) const
+{
+    return (parent.isValid()) ? 0 : m_downloadManager->m_downloads.count();
+}
+
+bool DownloadModel::removeRows(int row, int count, const QModelIndex &parent)
+{
+    if (parent.isValid())
+        return false;
+
+    int lastRow = row + count - 1;
+    for (int i = lastRow; i >= row; --i) {
+        if (m_downloadManager->m_downloads.at(i)->downloadedSuccessfully()) {
+            beginRemoveRows(parent, i, i);
+            m_downloadManager->m_downloads.takeAt(i)->deleteLater();
+            endRemoveRows();
+        }
+    }
+    m_downloadManager->m_autoSaver->changeOccurred();
+    return true;
+}