Improve behavior when using ProgramUpdater class

This is mainly to avoid involving of `sender()` function.

src/gui/mainwindow.cpp

@@ -90,7 +90,6 @@
 #include "statsdialog.h"
 #include "statusbar.h"
 #include "torrentcreatordialog.h"
-
 #include "transferlistfilterswidget.h"
 #include "transferlistmodel.h"
 #include "transferlistwidget.h"
@@ -148,9 +147,6 @@ MainWindow::MainWindow(QWidget *parent)
     , m_posInitialized(false)
     , m_forceExit(false)
     , m_unlockDlgShowing(false)
-#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-    , m_wasUpdateCheckEnabled(false)
-#endif
     , m_hasPython(false)
 {
     m_ui->setupUi(this);
@@ -317,11 +313,11 @@ MainWindow::MainWindow(QWidget *parent)
     connect(m_ui->actionUseAlternativeSpeedLimits, &QAction::triggered, this, &MainWindow::toggleAlternativeSpeeds);
 
 #if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-    m_programUpdateTimer = new QTimer(this);
-    m_programUpdateTimer->setInterval(60 * 60 * 1000);
-    m_programUpdateTimer->setSingleShot(true);
-    connect(m_programUpdateTimer, &QTimer::timeout, this, &MainWindow::checkProgramUpdate);
-    connect(m_ui->actionCheckForUpdates, &QAction::triggered, this, &MainWindow::checkProgramUpdate);
+    connect(m_ui->actionCheckForUpdates, &QAction::triggered, this, [this]() { checkProgramUpdate(true); });
+
+    // trigger an early check on startup
+    if (pref->isUpdateCheckEnabled())
+        checkProgramUpdate(false);
 #else
     m_ui->actionCheckForUpdates->setVisible(false);
 #endif
@@ -804,6 +800,7 @@ void MainWindow::cleanup()
     m_preventTimer->stop();
 
 #if (defined(Q_OS_WIN) || defined(Q_OS_MACOS))
+    if (m_programUpdateTimer)
         m_programUpdateTimer->stop();
 #endif
 
@@ -1583,15 +1580,21 @@ void MainWindow::loadPreferences(const bool configureSession)
     m_propertiesWidget->reloadPreferences();
 
 #if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-    if (pref->isUpdateCheckEnabled() && !m_wasUpdateCheckEnabled)
+    if (pref->isUpdateCheckEnabled())
+    {
+        if (!m_programUpdateTimer)
         {
-        m_wasUpdateCheckEnabled = true;
-        checkProgramUpdate();
+            m_programUpdateTimer = new QTimer(this);
+            m_programUpdateTimer->setInterval(60 * 60 * 1000);
+            m_programUpdateTimer->setSingleShot(true);
+            connect(m_programUpdateTimer, &QTimer::timeout, this, [this]() { checkProgramUpdate(false); });
+            m_programUpdateTimer->start();
+        }
     }
-    else if (!pref->isUpdateCheckEnabled() && m_wasUpdateCheckEnabled)
+    else
     {
-        m_wasUpdateCheckEnabled = false;
-        m_programUpdateTimer->stop();
+        delete m_programUpdateTimer;
+        m_programUpdateTimer = nullptr;
     }
 #endif
 
@@ -1897,15 +1900,21 @@ void MainWindow::on_actionDownloadFromURL_triggered()
 }
 
 #if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-void MainWindow::handleUpdateCheckFinished(const bool updateAvailable, const QString &newVersion, const bool invokedByUser)
+void MainWindow::handleUpdateCheckFinished(ProgramUpdater *updater, const bool invokedByUser)
 {
     m_ui->actionCheckForUpdates->setEnabled(true);
     m_ui->actionCheckForUpdates->setText(tr("&Check for Updates"));
     m_ui->actionCheckForUpdates->setToolTip(tr("Check for program updates"));
 
-    QObject *signalSender = sender();
+    const auto cleanup = [this, updater]()
+    {
+        if (m_programUpdateTimer)
+            m_programUpdateTimer->start();
+        updater->deleteLater();
+    };
 
-    if (updateAvailable)
+    const QString newVersion = updater->getNewVersion();
+    if (!newVersion.isEmpty())
     {
         const QString msg {tr("A new version is available.") + "<br/>"
             + tr("Do you want to download %1?").arg(newVersion) + "<br/><br/>"
@@ -1915,39 +1924,32 @@ void MainWindow::handleUpdateCheckFinished(const bool updateAvailable, const QSt
         msgBox->setAttribute(Qt::WA_DeleteOnClose);
         msgBox->setAttribute(Qt::WA_ShowWithoutActivating);
         msgBox->setDefaultButton(QMessageBox::Yes);
-        connect(msgBox, &QMessageBox::buttonClicked, this, [this, msgBox, signalSender](QAbstractButton *button)
+        connect(msgBox, &QMessageBox::buttonClicked, this, [this, msgBox, updater](QAbstractButton *button)
         {
             if (msgBox->buttonRole(button) == QMessageBox::YesRole)
             {
-                // The user want to update, let's download the update
-                auto *updater = dynamic_cast<ProgramUpdater *>(signalSender);
                 updater->updateProgram();
             }
-            else
-            {
-                if (Preferences::instance()->isUpdateCheckEnabled())
-                    m_programUpdateTimer->start();
-            }
-
-            signalSender->deleteLater();
         });
+        connect(msgBox, &QDialog::finished, this, cleanup);
         msgBox->open();
     }
-    else if (invokedByUser)
+    else
+    {
+        if (invokedByUser)
         {
             auto *msgBox = new QMessageBox {QMessageBox::Information, QLatin1String("qBittorrent")
                 , tr("No updates available.\nYou are already using the latest version.")
                 , QMessageBox::Ok, this};
             msgBox->setAttribute(Qt::WA_DeleteOnClose);
-        connect(msgBox, &QDialog::finished, this, [this, signalSender](const int)
-        {
-            if (Preferences::instance()->isUpdateCheckEnabled())
-                m_programUpdateTimer->start();
-
-            signalSender->deleteLater();
-        });
+            connect(msgBox, &QDialog::finished, this, cleanup);
             msgBox->open();
         }
+        else
+        {
+            cleanup();
+        }
+    }
 }
 #endif
 
@@ -2106,18 +2108,23 @@ QIcon MainWindow::getSystrayIcon() const
 #endif // Q_OS_MACOS
 
 #if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-void MainWindow::checkProgramUpdate()
+void MainWindow::checkProgramUpdate(const bool invokedByUser)
 {
-    m_programUpdateTimer->stop(); // If the user had clicked the menu item
+    if (m_programUpdateTimer)
+        m_programUpdateTimer->stop();
+
     m_ui->actionCheckForUpdates->setEnabled(false);
     m_ui->actionCheckForUpdates->setText(tr("Checking for Updates..."));
     m_ui->actionCheckForUpdates->setToolTip(tr("Already checking for program updates in the background"));
-    bool invokedByUser = m_ui->actionCheckForUpdates == qobject_cast<QAction *>(sender());
-    ProgramUpdater *updater = new ProgramUpdater(this, invokedByUser);
-    connect(updater, &ProgramUpdater::updateCheckFinished, this, &MainWindow::handleUpdateCheckFinished);
+
+    auto *updater = new ProgramUpdater(this);
+    connect(updater, &ProgramUpdater::updateCheckFinished
+        , this, [this, invokedByUser, updater]()
+    {
+        handleUpdateCheckFinished(updater, invokedByUser);
+    });
     updater->checkForUpdates();
 }
-
 #endif
 
 #ifdef Q_OS_WIN

src/gui/mainwindow.h

@@ -47,6 +47,7 @@ class ExecutionLogWidget;
 class LineEdit;
 class OptionsDialog;
 class PowerManagement;
+class ProgramUpdater;
 class PropertiesWidget;
 class RSSWidget;
 class SearchWidget;
@@ -134,9 +135,6 @@ private slots:
     void finishedTorrent(BitTorrent::Torrent *const torrent) const;
     void askRecursiveTorrentDownloadConfirmation(BitTorrent::Torrent *const torrent);
     void optionsSaved();
-#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-    void handleUpdateCheckFinished(bool updateAvailable, const QString &newVersion, bool invokedByUser);
-#endif
     void toggleAlternativeSpeeds();
 
 #ifdef Q_OS_WIN
@@ -177,9 +175,7 @@ private slots:
     void on_actionLock_triggered();
     // Check for unpaused downloading or seeding torrents and prevent system suspend/sleep according to preferences
     void updatePowerManagementState();
-#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-    void checkProgramUpdate();
-#endif
+
     void toolbarMenuRequested(const QPoint &point);
     void toolbarIconsOnly();
     void toolbarTextOnly();
@@ -252,10 +248,13 @@ private:
     // Power Management
     PowerManagement *m_pwr;
     QTimer *m_preventTimer;
-#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-    QTimer *m_programUpdateTimer;
-    bool m_wasUpdateCheckEnabled;
-#endif
     bool m_hasPython;
     QMenu *m_toolbarMenu;
+
+#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
+    void checkProgramUpdate(bool invokedByUser);
+    void handleUpdateCheckFinished(ProgramUpdater *updater, bool invokedByUser);
+
+    QTimer *m_programUpdateTimer = nullptr;
+#endif
 };

src/gui/programupdater.cpp

@@ -1,5 +1,6 @@
 /*
  * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2021  Mike Tzou (Chocobo1)
  * Copyright (C) 2010  Christophe Dumez <chris@qbittorrent.org>
  *
  * This program is free software; you can redistribute it and/or
@@ -72,12 +73,6 @@ namespace
     }
 }
 
-ProgramUpdater::ProgramUpdater(QObject *parent, const bool invokedByUser)
-    : QObject(parent)
-    , m_invokedByUser(invokedByUser)
-{
-}
-
 void ProgramUpdater::checkForUpdates() const
 {
     const auto RSS_URL = QString::fromLatin1("https://www.fosshub.com/feed/5b8793a7f9ee5a5c3e97a3b2.xml");
@@ -88,12 +83,17 @@ void ProgramUpdater::checkForUpdates() const
         , this, &ProgramUpdater::rssDownloadFinished);
 }
 
+QString ProgramUpdater::getNewVersion() const
+{
+    return m_newVersion;
+}
+
 void ProgramUpdater::rssDownloadFinished(const Net::DownloadResult &result)
 {
     if (result.status != Net::DownloadStatus::Success)
     {
         qDebug() << "Downloading the new qBittorrent updates RSS failed:" << result.errorString;
-        emit updateCheckFinished(false, QString(), m_invokedByUser);
+        emit updateCheckFinished();
         return;
     }
 
@@ -110,17 +110,16 @@ void ProgramUpdater::rssDownloadFinished(const Net::DownloadResult &result)
 #ifdef Q_OS_MACOS
     const QString OS_TYPE {"Mac OS X"};
 #elif defined(Q_OS_WIN)
-    const QString OS_TYPE
-    {(::IsWindows7OrGreater()
+    const QString OS_TYPE {(::IsWindows7OrGreater()
         && QSysInfo::currentCpuArchitecture().endsWith("64"))
         ? "Windows x64" : "Windows"};
 #endif
 
-    QString version;
-    QXmlStreamReader xml(result.data);
     bool inItem = false;
+    QString version;
     QString updateLink;
     QString type;
+    QXmlStreamReader xml(result.data);
 
     while (!xml.atEnd())
     {
@@ -148,7 +147,10 @@ void ProgramUpdater::rssDownloadFinished(const Net::DownloadResult &result)
                     {
                         qDebug("Detected version is %s", qUtf8Printable(version));
                         if (isVersionMoreRecent(version))
-                            m_updateUrl = updateLink;
+                        {
+                            m_newVersion = version;
+                            m_updateURL = updateLink;
+                        }
                     }
                     break;
                 }
@@ -161,11 +163,10 @@ void ProgramUpdater::rssDownloadFinished(const Net::DownloadResult &result)
         }
     }
 
-    emit updateCheckFinished(!m_updateUrl.isEmpty(), version, m_invokedByUser);
+    emit updateCheckFinished();
 }
 
-void ProgramUpdater::updateProgram() const
+bool ProgramUpdater::updateProgram() const
 {
-    Q_ASSERT(!m_updateUrl.isEmpty());
-    QDesktopServices::openUrl(m_updateUrl);
+    return QDesktopServices::openUrl(m_updateURL);
 }

src/gui/programupdater.h

@@ -1,5 +1,6 @@
 /*
  * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2021  Mike Tzou (Chocobo1)
  * Copyright (C) 2010  Christophe Dumez <chris@qbittorrent.org>
  *
  * This program is free software; you can redistribute it and/or
@@ -29,6 +30,8 @@
 #pragma once
 
 #include <QObject>
+#include <QString>
+#include <QUrl>
 
 namespace Net
 {
@@ -41,18 +44,19 @@ class ProgramUpdater final : public QObject
     Q_DISABLE_COPY(ProgramUpdater)
 
 public:
-    explicit ProgramUpdater(QObject *parent = nullptr, bool invokedByUser = false);
+    using QObject::QObject;
 
     void checkForUpdates() const;
-    void updateProgram() const;
+    QString getNewVersion() const;
+    bool updateProgram() const;
 
 signals:
-    void updateCheckFinished(bool updateAvailable, const QString &version, bool invokedByUser);
+    void updateCheckFinished();
 
 private slots:
     void rssDownloadFinished(const Net::DownloadResult &result);
 
 private:
-    QString m_updateUrl;
-    const bool m_invokedByUser;
+    QString m_newVersion;
+    QUrl m_updateURL;
 };