refactor(Qt): fix build with Qt 5.15

This fixes compile-time warnings about deprecated functions when
building with Qt 5.15.

(cherry picked from commit 6d51971c6f)

src/core/core.cpp

@@ -34,6 +34,9 @@
 #include "src/util/strongtype.h"
 
 #include <QCoreApplication>
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+#include <QRandomGenerator>
+#endif
 #include <QRegularExpression>
 #include <QString>
 #include <QStringBuilder>
@@ -467,7 +470,11 @@ void Core::bootstrapDht()
     }
 
     int i = 0;
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    static int j = QRandomGenerator::global()->generate() % listSize;
+#else
     static int j = qrand() % listSize;
+#endif
     // i think the more we bootstrap, the more we jitter because the more we overwrite nodes
     while (i < 2) {
         const DhtServer& dhtServer = bootstrapNodes[j % listSize];

src/main.cpp

@@ -175,7 +175,9 @@ int main(int argc, char* argv[])
     qInstallMessageHandler(logMessageHandler);
 
     // initialize random number generator
+#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
     qsrand(time(nullptr));
+#endif
 
     std::unique_ptr<QApplication> a(new QApplication(argc, argv));
 
@@ -207,7 +209,9 @@ int main(int argc, char* argv[])
     osx::migrateProfiles();
 #endif
 
+#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
     qsrand(time(nullptr));
+#endif
     Settings& settings = Settings::getInstance();
     QString locale = settings.getTranslation();
     Translator::translate(locale);

src/model/sessionchatlog.cpp

@@ -96,7 +96,11 @@ bool toxFileIsComplete(ToxFile::FileStatus status)
 std::map<ChatLogIdx, ChatLogItem>::const_iterator
 firstItemAfterDate(QDate date, const std::map<ChatLogIdx, ChatLogItem>& items)
 {
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    return std::lower_bound(items.begin(), items.end(), QDateTime(date.startOfDay()),
+#else
     return std::lower_bound(items.begin(), items.end(), QDateTime(date),
+#endif
                             [](const MessageDateAdaptor& a, MessageDateAdaptor const& b) {
                                 return a.timestamp.date() < b.timestamp.date();
                             });

src/persistence/history.cpp

@@ -957,7 +957,11 @@ QList<History::DateIdx> History::getNumMessagesForFriendBeforeDateBoundaries(con
                                "%4;")
                            .arg(countMessagesForFriend)
                            .arg(friendPkString)
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+                           .arg(QDateTime(from.startOfDay()).toMSecsSinceEpoch())
+#else
                            .arg(QDateTime(from).toMSecsSinceEpoch())
+#endif
                            .arg(limitString);
 
     QList<DateIdx> dateIdxs;

src/widget/emoticonswidget.cpp

@@ -161,8 +161,16 @@ void EmoticonsWidget::mousePressEvent(QMouseEvent*)
 
 void EmoticonsWidget::wheelEvent(QWheelEvent* e)
 {
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    const bool vertical = qAbs(e->angleDelta().y()) >= qAbs(e->angleDelta().x());
+    const int delta = vertical ? e->angleDelta().y() : e->angleDelta().x();
+
+    if (vertical) {
+        if (delta < 0) {
+#else
     if (e->orientation() == Qt::Vertical) {
         if (e->delta() < 0) {
+#endif
             stack.setCurrentIndex(stack.currentIndex() + 1);
         } else {
             stack.setCurrentIndex(stack.currentIndex() - 1);

src/widget/flowlayout.cpp

@@ -104,7 +104,7 @@ QLayoutItem* FlowLayout::takeAt(int index)
 
 Qt::Orientations FlowLayout::expandingDirections() const
 {
-    return nullptr;
+    return {};
 }
 
 bool FlowLayout::hasHeightForWidth() const

src/widget/form/loadhistorydialog.cpp

@@ -52,7 +52,11 @@ LoadHistoryDialog::~LoadHistoryDialog()
 
 QDateTime LoadHistoryDialog::getFromDate()
 {
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    QDateTime res(ui->fromDate->selectedDate().startOfDay());
+#else
     QDateTime res(ui->fromDate->selectedDate());
+#endif
     if (res.date().month() != ui->fromDate->monthShown()
         || res.date().year() != ui->fromDate->yearShown()) {
         QDate newDate(ui->fromDate->yearShown(), ui->fromDate->monthShown(), 1);

src/widget/form/searchsettingsform.cpp

@@ -37,7 +37,11 @@ SearchSettingsForm::SearchSettingsForm(QWidget *parent) :
 
     reloadTheme();
 
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    connect(ui->startSearchComboBox, QOverload<int, const QString &>::of(&QComboBox::currentIndexChanged),
+#else
     connect(ui->startSearchComboBox, static_cast<void(QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+#endif
             this, &SearchSettingsForm::onStartSearchSelected);
     connect(ui->registerCheckBox, &QCheckBox::clicked, this, &SearchSettingsForm::onRegisterClicked);
     connect(ui->wordsOnlyRadioButton, &QCheckBox::clicked, this, &SearchSettingsForm::onWordsOnlyClicked);

src/widget/form/settings/privacyform.cpp

@@ -23,6 +23,9 @@
 #include <QDebug>
 #include <QFile>
 #include <QMessageBox>
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+#include <QRandomGenerator>
+#endif
 
 #include "src/core/core.h"
 #include "src/nexus.h"
@@ -98,11 +101,19 @@ void PrivacyForm::showEvent(QShowEvent*)
 void PrivacyForm::on_randomNosapamButton_clicked()
 {
     QTime time = QTime::currentTime();
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    QRandomGenerator((uint)time.msec());
+#else
     qsrand((uint)time.msec());
+#endif
 
     uint32_t newNospam{0};
     for (int i = 0; i < 4; ++i)
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+        newNospam = (newNospam << 8) + (QRandomGenerator::global()->generate() % 256); // Generate byte by byte. For some reason.
+#else
         newNospam = (newNospam << 8) + (qrand() % 256); // Generate byte by byte. For some reason.
+#endif
 
     Core::getInstance()->setNospam(newNospam);
     bodyUI->nospamLineEdit->setText(Core::getInstance()->getSelfId().getNoSpamString());

src/widget/genericchatitemlayout.h

@@ -33,7 +33,11 @@ public:
     GenericChatItemLayout(const GenericChatItemLayout& layout) = delete;
     ~GenericChatItemLayout();
 
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    void addSortedWidget(GenericChatItemWidget* widget, int stretch = 0, Qt::Alignment alignment = Qt::Alignment());
+#else
     void addSortedWidget(GenericChatItemWidget* widget, int stretch = 0, Qt::Alignment alignment = nullptr);
+#endif
     int indexOfSortedWidget(GenericChatItemWidget* widget) const;
     bool existsSortedWidget(GenericChatItemWidget* widget) const;
     void removeSortedWidget(GenericChatItemWidget* widget);

src/widget/tool/activatedialog.h

@@ -26,7 +26,11 @@ class ActivateDialog : public QDialog
 {
     Q_OBJECT
 public:
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    ActivateDialog(QWidget* parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+#else
     ActivateDialog(QWidget* parent = nullptr, Qt::WindowFlags f = nullptr);
+#endif
     bool event(QEvent* event) override;
 
 signals: