Qt: Remove checks for version below 5.2

This stops the main source from being buildable by Qt 4.x

Change-Id: I61edbae04ac2b3bf0ae8ee8e09d335083945c176
Reviewed-on: https://code.wireshark.org/review/26756
Petri-Dish: Roland Knall <rknall@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>

38 files changed, 52 insertions, 335 deletions

diff --git a/ui/qt/bluetooth_device_dialog.cpp b/ui/qt/bluetooth_device_dialog.cpp
index 8ff5067b5b..63f4663d17 100644
--- a/ui/qt/bluetooth_device_dialog.cpp
+++ b/ui/qt/bluetooth_device_dialog.cpp
@@ -110,11 +110,7 @@ BluetoothDeviceDialog::BluetoothDeviceDialog(QWidget &parent, CaptureFile &cf, Q
 
     connect(ui->tableWidget, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(tableContextMenu(const QPoint &)));
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    ui->tableWidget->horizontalHeader()->setResizeMode(0, QHeaderView::Stretch);
-#else
     ui->tableWidget->horizontalHeader()->setSectionResizeMode(0, QHeaderView::Stretch);
-#endif
 
     ui->tableWidget->setStyleSheet("QTableView::item:hover{background-color:lightyellow; color:black;}");
 
diff --git a/ui/qt/extcap_argument.cpp b/ui/qt/extcap_argument.cpp
index 16eb2bb9ba..c8165cda00 100644
--- a/ui/qt/extcap_argument.cpp
+++ b/ui/qt/extcap_argument.cpp
@@ -167,11 +167,7 @@ void ExtArgSelector::onReloadTriggered()
     int counter = 0;
     int selected = -1;
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
     QString call = boxSelection->currentData().toString();
-#else
-    QString call = boxSelection->itemData(boxSelection->currentIndex()).toString();
-#endif
     const char *prefval = _argument->pref_valptr ? *_argument->pref_valptr : NULL;
     QString stored(prefval ? prefval : "");
     if ( call != stored )
@@ -223,11 +219,7 @@ QString ExtArgSelector::value()
     if ( boxSelection == 0 )
         return QString();
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
     QVariant data = boxSelection->currentData();
-#else
-    QVariant data = boxSelection->itemData(boxSelection->currentIndex());
-#endif
 
     return data.toString();
 }
diff --git a/ui/qt/follow_stream_dialog.cpp b/ui/qt/follow_stream_dialog.cpp
index 6ffdc2c967..1bd97b0a34 100644
--- a/ui/qt/follow_stream_dialog.cpp
+++ b/ui/qt/follow_stream_dialog.cpp
@@ -239,6 +239,8 @@ void FollowStreamDialog::findText(bool go_back)
 {
     if (ui->leFind->text().isEmpty()) return;
 
+    /* Version check due to find on teStreamContent. Expects regex since 5.3
+     * http://doc.qt.io/qt-5/qplaintextedit.html#find-1 */
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 3, 0))
     bool found;
     if (use_regex_find_) {
diff --git a/ui/qt/interface_toolbar.cpp b/ui/qt/interface_toolbar.cpp
index 6262dd0803..57a469ec22 100644
--- a/ui/qt/interface_toolbar.cpp
+++ b/ui/qt/interface_toolbar.cpp
@@ -244,15 +244,7 @@ QWidget *InterfaceToolbar::createSelector(iface_toolbar_control *control)
         combobox->addItem(display, value);
         if (val->is_default)
         {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
             combobox->setCurrentText(display);
-#else
-            int new_index = combobox->findText(display);
-            if (new_index >= 0)
-            {
-                combobox->setCurrentIndex(new_index);
-            }
-#endif
             setDefaultValue(control->num, value.toUtf8());
         }
         foreach (QString ifname, interface_.keys())
@@ -764,15 +756,7 @@ void InterfaceToolbar::startCapture(GArray *ifaces)
 
     if (!selected_found && !first_capturing_ifname.isEmpty())
     {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
         ui->interfacesComboBox->setCurrentText(first_capturing_ifname);
-#else
-        int new_index = ui->interfacesComboBox->findText(first_capturing_ifname);
-        if (new_index >= 0)
-        {
-            ui->interfacesComboBox->setCurrentIndex(new_index);
-        }
-#endif
     }
     else
     {
@@ -786,9 +770,7 @@ void InterfaceToolbar::stopCapture()
     {
         if (interface_[ifname].reader_thread)
         {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
             interface_[ifname].reader_thread->requestInterruption();
-#endif
             interface_[ifname].reader_thread = NULL;
         }
 
@@ -952,15 +934,7 @@ void InterfaceToolbar::interfaceListChanged()
             if (selected_ifname.compare(device->name) == 0)
             {
                 // Keep selected interface
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
                 ui->interfacesComboBox->setCurrentText(device->name);
-#else
-                int new_index = ui->interfacesComboBox->findText(device->name);
-                if (new_index >= 0)
-                {
-                    ui->interfacesComboBox->setCurrentIndex(new_index);
-                }
-#endif
                 keep_selected = true;
             }
         }
diff --git a/ui/qt/interface_toolbar_reader.cpp b/ui/qt/interface_toolbar_reader.cpp
index 1e3ee907fb..e1e8ea161c 100644
--- a/ui/qt/interface_toolbar_reader.cpp
+++ b/ui/qt/interface_toolbar_reader.cpp
@@ -96,12 +96,10 @@ int InterfaceToolbarReader::pipe_read(char *data, int nbyte)
             total_len += read_len;
         }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
         if (QThread::currentThread()->isInterruptionRequested())
         {
             return -1;
         }
-#endif
     }
 
     return total_len;
@@ -141,12 +139,10 @@ void InterfaceToolbarReader::loop()
             break;
         }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
         if (QThread::currentThread()->isInterruptionRequested())
         {
             break;
         }
-#endif
 
         if (ret == 0 || !FD_ISSET(fd_in_, &readfds))
         {
diff --git a/ui/qt/main_window.cpp b/ui/qt/main_window.cpp
index 89231ce39f..d9632b06fc 100644
--- a/ui/qt/main_window.cpp
+++ b/ui/qt/main_window.cpp
@@ -238,7 +238,6 @@ static void plugin_if_mainwindow_update_toolbars(GHashTable * data_set)
     }
 }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
 static void mainwindow_add_toolbar(const iface_toolbar *toolbar_entry)
 {
     if (gbl_cur_main_window_ && toolbar_entry)
@@ -254,7 +253,6 @@ static void mainwindow_remove_toolbar(const gchar *menu_title)
         gbl_cur_main_window_->removeInterfaceToolbar(menu_title);
     }
 }
-#endif
 
 QMenu* MainWindow::findOrAddMenu(QMenu *parent_menu, QString& menu_text) {
     QList<QAction *> actions = parent_menu->actions();
@@ -296,7 +294,7 @@ MainWindow::MainWindow(QWidget *parent) :
 #else
     , pipe_notifier_(NULL)
 #endif
-#if defined(Q_OS_MAC) && QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
+#if defined(Q_OS_MAC)
     , dock_menu_(NULL)
 #endif
 {
@@ -458,7 +456,7 @@ MainWindow::MainWindow(QWidget *parent) :
 #endif
 
     // Set OS specific shortcuts for fullscreen mode
-#if defined(Q_OS_MAC) && QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+#if defined(Q_OS_MAC)
     main_ui_->actionViewFullScreen->setShortcut(QKeySequence::FullScreen);
 #else
     main_ui_->actionViewFullScreen->setShortcut(QKeySequence(Qt::Key_F11));
@@ -701,14 +699,8 @@ MainWindow::MainWindow(QWidget *parent) :
 #endif
     plugin_if_register_gui_cb(PLUGIN_IF_REMOVE_TOOLBAR, plugin_if_mainwindow_update_toolbars);
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
-    // Register Interface Toolbar callbacks
-    //
-    // Qt version must be 5.2 or higher because the use of
-    // QThread::requestInterruption() in interface_toolbar.cpp and
-    // QThread::isInterruptionRequested() in interface_toolbar_reader.cpp
+    /* Register Interface Toolbar callbacks */
     iface_toolbar_register_cb(mainwindow_add_toolbar, mainwindow_remove_toolbar);
-#endif
 
     main_ui_->mainStack->setCurrentWidget(main_welcome_);
 }
@@ -2434,11 +2426,9 @@ void MainWindow::changeEvent(QEvent* event)
             wsApp->loadLanguage(locale);
             }
             break;
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
         case QEvent::WindowStateChange:
             main_ui_->actionViewFullScreen->setChecked(this->isFullScreen());
             break;
-#endif
         default:
             break;
         }
@@ -2531,12 +2521,7 @@ void MainWindow::addMenuActions(QList<QAction *> &actions, int menu_group)
             QMenu *cur_menu = main_ui_->menuTools;
             while (menu_path.length() > 1) {
                 QString menu_title = menu_path.takeFirst();
-#if (QT_VERSION > QT_VERSION_CHECK(5, 0, 0))
                 QMenu *submenu = cur_menu->findChild<QMenu *>(menu_title.toLower(), Qt::FindDirectChildrenOnly);
-#else
-                QMenu *submenu = cur_menu->findChild<QMenu *>(menu_title.toLower());
-                if (submenu && submenu->parent() != cur_menu) submenu = NULL;
-#endif
                 if (!submenu) {
                     submenu = cur_menu->addMenu(menu_title);
                     submenu->setObjectName(menu_title.toLower());
@@ -2596,12 +2581,7 @@ void MainWindow::removeMenuActions(QList<QAction *> &actions, int menu_group)
             QMenu *cur_menu = main_ui_->menuTools;
             while (menu_path.length() > 1) {
                 QString menu_title = menu_path.takeFirst();
-#if (QT_VERSION > QT_VERSION_CHECK(5, 0, 0))
                 QMenu *submenu = cur_menu->findChild<QMenu *>(menu_title.toLower(), Qt::FindDirectChildrenOnly);
-#else
-                QMenu *submenu = cur_menu->findChild<QMenu *>(menu_title.toLower());
-                if (submenu && submenu->parent() != cur_menu) submenu = NULL;
-#endif
                 cur_menu = submenu;
             }
             cur_menu->removeAction(action);
diff --git a/ui/qt/main_window.h b/ui/qt/main_window.h
index fb9d03940e..17197e0d33 100644
--- a/ui/qt/main_window.h
+++ b/ui/qt/main_window.h
@@ -67,9 +67,6 @@ namespace Ui {
     class MainWindow;
 }
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-Q_DECLARE_METATYPE(QToolBar *)
-#endif
 Q_DECLARE_METATYPE(ts_type)
 Q_DECLARE_METATYPE(ts_precision)
 
@@ -190,7 +187,7 @@ private:
     QSocketNotifier *pipe_notifier_;
 #endif
 
-#if defined(Q_OS_MAC) && QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
+#if defined(Q_OS_MAC)
     QMenu *dock_menu_;
 #endif
 
diff --git a/ui/qt/main_window_slots.cpp b/ui/qt/main_window_slots.cpp
index b1cc787ad4..4193a62c7e 100644
--- a/ui/qt/main_window_slots.cpp
+++ b/ui/qt/main_window_slots.cpp
@@ -164,7 +164,7 @@ DIAG_ON(frame-larger-than=)
 
 // XXX You must uncomment QT_WINEXTRAS_LIB lines in CMakeList.txt and
 // cmakeconfig.h.in.
-// #if defined(QT_WINEXTRAS_LIB) && QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
+// #if defined(QT_WINEXTRAS_LIB)
 // #include <QWinJumpList>
 // #include <QWinJumpListCategory>
 // #include <QWinJumpListItem>
@@ -1245,15 +1245,17 @@ void MainWindow::updateRecentCaptures() {
     }
     recentMenu->clear();
 
-// #if defined(QT_WINEXTRAS_LIB) && QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
-//     QWinJumpList recent_jl(this);
-//     QWinJumpListCategory *recent_jlc = recent_jl.recent();
-//     if (recent_jlc) {
-//         recent_jlc->clear();
-//         recent_jlc->setVisible(true);
-//     }
-// #endif
-#if defined(Q_OS_MAC) && QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
+#if 0
+#if defined(QT_WINEXTRAS_LIB)
+     QWinJumpList recent_jl(this);
+     QWinJumpListCategory *recent_jlc = recent_jl.recent();
+     if (recent_jlc) {
+         recent_jlc->clear();
+         recent_jlc->setVisible(true);
+     }
+#endif
+#endif
+#if defined(Q_OS_MAC)
     if (!dock_menu_) {
         dock_menu_ = new QMenu();
         dock_menu_->setAsDockMenu();
@@ -1279,22 +1281,24 @@ void MainWindow::updateRecentCaptures() {
         ra->setText(action_cf_name);
         connect(ra, SIGNAL(triggered()), this, SLOT(recentActionTriggered()));
 
-// This is slow, at least on my VM here. The added links also open Wireshark
-// in a new window. It might make more sense to add a recent item when we
-// open a capture file.
-// #if defined(QT_WINEXTRAS_LIB) && QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
-//     if (recent_jlc) {
-//         QFileInfo fi(ri->filename);
-//         QWinJumpListItem *jli = recent_jlc->addLink(
-//             fi.fileName(),
-//             QApplication::applicationFilePath(),
-//             QStringList() << "-r" << ri->filename
-//         );
-//         // XXX set icon
-//         jli->setWorkingDirectory(QDir::toNativeSeparators(QApplication::applicationDirPath()));
-//     }
-// #endif
-#if defined(Q_OS_MAC) && QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
+/* This is slow, at least on my VM here. The added links also open Wireshark
+ * in a new window. It might make more sense to add a recent item when we
+ * open a capture file. */
+#if 0
+#if defined(QT_WINEXTRAS_LIB)
+     if (recent_jlc) {
+         QFileInfo fi(ri->filename);
+         QWinJumpListItem *jli = recent_jlc->addLink(
+             fi.fileName(),
+             QApplication::applicationFilePath(),
+             QStringList() << "-r" << ri->filename
+         );
+         // XXX set icon
+         jli->setWorkingDirectory(QDir::toNativeSeparators(QApplication::applicationDirPath()));
+     }
+#endif
+#endif
+#if defined(Q_OS_MAC)
         QAction *rda = new QAction(dock_menu_);
         QFileInfo fi(ri->filename);
         rda->setText(fi.fileName());
diff --git a/ui/qt/models/coloring_rules_model.cpp b/ui/qt/models/coloring_rules_model.cpp
index 3e7effae5b..fa7a5ff6d5 100644
--- a/ui/qt/models/coloring_rules_model.cpp
+++ b/ui/qt/models/coloring_rules_model.cpp
@@ -358,16 +358,10 @@ bool ColoringRulesModel::setData(const QModelIndex &dataIndex, const QVariant &v
         return false;
     }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
     QVector<int> roles;
     roles << role;
-#endif
 
-    emit dataChanged(topLeft, bottomRight
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                         , roles
-#endif
-        );
+    emit dataChanged(topLeft, bottomRight, roles);
 
     return true;
 
diff --git a/ui/qt/models/decode_as_delegate.cpp b/ui/qt/models/decode_as_delegate.cpp
index 16d6665c6a..8e1de4913b 100644
--- a/ui/qt/models/decode_as_delegate.cpp
+++ b/ui/qt/models/decode_as_delegate.cpp
@@ -295,28 +295,14 @@ void DecodeAsDelegate::setEditorData(QWidget *editor, const QModelIndex &index)
         {
         QComboBox *combobox = static_cast<QComboBox *>(editor);
         const QString &data = index.model()->data(index, Qt::EditRole).toString();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
         combobox->setCurrentText(data);
-#else
-        int new_index = combobox->findText(data);
-        if (new_index >= 0) {
-            combobox->setCurrentIndex(new_index);
-        }
-#endif
         }
         break;
     case DecodeAsModel::colSelector:
         if (isSelectorCombo(item)) {
             QComboBox *combobox = static_cast<QComboBox *>(editor);
             const QString &data = index.model()->data(index, Qt::EditRole).toString();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
             combobox->setCurrentText(data);
-#else
-            int new_index = combobox->findText(data);
-            if (new_index >= 0) {
-                combobox->setCurrentIndex(new_index);
-            }
-#endif
         }
         else {
             QStyledItemDelegate::setEditorData(editor, index);
diff --git a/ui/qt/models/decode_as_model.cpp b/ui/qt/models/decode_as_model.cpp
index 7e049cc1ba..06e9607249 100644
--- a/ui/qt/models/decode_as_model.cpp
+++ b/ui/qt/models/decode_as_model.cpp
@@ -385,11 +385,7 @@ bool DecodeAsModel::copyRow(int dst_row, int src_row)
 
     QVector<int> roles;
     roles << Qt::EditRole << Qt::BackgroundRole;
-    emit dataChanged(index(dst_row, 0), index(dst_row, columnCount())
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                     , roles
-#endif
-    );
+    emit dataChanged(index(dst_row, 0), index(dst_row, columnCount()), roles );
 
     return true;
 }
diff --git a/ui/qt/models/enabled_protocols_model.cpp b/ui/qt/models/enabled_protocols_model.cpp
index e7b74dc8e3..e65ac7edd5 100644
--- a/ui/qt/models/enabled_protocols_model.cpp
+++ b/ui/qt/models/enabled_protocols_model.cpp
@@ -252,11 +252,7 @@ bool EnabledProtocolsModel::setData(const QModelIndex &index, const QVariant &va
     QVector<int> roles;
     roles << role;
 
-    emit dataChanged(index, index
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                         , roles
-#endif
-        );
+    emit dataChanged(index, index, roles);
 
     return true;
 }
diff --git a/ui/qt/models/info_proxy_model.cpp b/ui/qt/models/info_proxy_model.cpp
index de8fecded6..72b26f1a8a 100644
--- a/ui/qt/models/info_proxy_model.cpp
+++ b/ui/qt/models/info_proxy_model.cpp
@@ -104,27 +104,17 @@ void InfoProxyModel::setColumn(int column)
     int old_column = column_;
     column_ = column;
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
     QVector<int> roles;
     roles << Qt::DisplayRole;
-#endif
 
     if (old_column >= 0) {
         //Notify old column has changed
-        emit dataChanged(index(0, old_column), index(rowCount(), old_column)
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                         , roles
-#endif
-        );
+        emit dataChanged(index(0, old_column), index(rowCount(), old_column), roles );
     }
 
     if (column_ >= 0) {
         //Notify new column has changed
-        emit dataChanged(index(0, column_), index(rowCount(), column_)
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                         , roles
-#endif
-        );
+        emit dataChanged(index(0, column_), index(rowCount(), column_), roles);
     }
 }
 
diff --git a/ui/qt/models/pref_models.cpp b/ui/qt/models/pref_models.cpp
index 4ac6c4b26e..4b1cf1a8ff 100644
--- a/ui/qt/models/pref_models.cpp
+++ b/ui/qt/models/pref_models.cpp
@@ -516,18 +516,12 @@ bool AdvancedPrefsModel::setData(const QModelIndex &dataindex, const QVariant &v
         }
     }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
     QVector<int> roles;
     roles << role;
-#endif
 
     // The status field may change as well as the value, so mark them for update
     emit dataChanged(index(dataindex.row(), AdvancedPrefsModel::colStatus),
-                     index(dataindex.row(), AdvancedPrefsModel::colValue)
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                        , roles
-#endif
-        );
+                     index(dataindex.row(), AdvancedPrefsModel::colValue), roles);
 
     return true;
 }
diff --git a/ui/qt/models/proto_tree_model.cpp b/ui/qt/models/proto_tree_model.cpp
index 637d0d0072..c3787b9e91 100644
--- a/ui/qt/models/proto_tree_model.cpp
+++ b/ui/qt/models/proto_tree_model.cpp
@@ -28,11 +28,10 @@ ProtoTreeModel::ProtoTreeModel(QObject * parent) :
 Qt::ItemFlags ProtoTreeModel::flags(const QModelIndex &index) const
 {
     Qt::ItemFlags item_flags = QAbstractItemModel::flags(index);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
     if (rowCount(index) < 1) {
         item_flags |= Qt::ItemNeverHasChildren;
     }
-#endif
+
     return item_flags;
 }
 
diff --git a/ui/qt/models/related_packet_delegate.cpp b/ui/qt/models/related_packet_delegate.cpp
index 23d9152744..93b3c1f7c1 100644
--- a/ui/qt/models/related_packet_delegate.cpp
+++ b/ui/qt/models/related_packet_delegate.cpp
@@ -36,21 +36,13 @@ RelatedPacketDelegate::RelatedPacketDelegate(QWidget *parent) :
 void RelatedPacketDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                               const QModelIndex &index) const
 {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    QStyleOptionViewItemV4 option_vi = option;
-#else
     QStyleOptionViewItem option_vi = option;
-#endif
     QStyledItemDelegate::initStyleOption(&option_vi, index);
     int em_w = option_vi.fontMetrics.height();
     int en_w = (em_w + 1) / 2;
     int line_w = (option_vi.fontMetrics.lineWidth());
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    option_vi.features |= QStyleOptionViewItemV4::HasDecoration;
-#else
     option_vi.features |= QStyleOptionViewItem::HasDecoration;
-#endif
     option_vi.decorationSize.setHeight(1);
     option_vi.decorationSize.setWidth(em_w);
     QStyledItemDelegate::paint(painter, option_vi, index);
diff --git a/ui/qt/models/uat_delegate.cpp b/ui/qt/models/uat_delegate.cpp
index 98e44e629e..9d63bf826e 100644
--- a/ui/qt/models/uat_delegate.cpp
+++ b/ui/qt/models/uat_delegate.cpp
@@ -147,14 +147,7 @@ void UatDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
     {
         QComboBox *combobox = static_cast<QComboBox *>(editor);
         const QString &data = index.model()->data(index, Qt::EditRole).toString();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
         combobox->setCurrentText(data);
-#else
-        int new_index = combobox->findText(data);
-        if (new_index >= 0) {
-            combobox->setCurrentIndex(new_index);
-        }
-#endif
 
         break;
     }
diff --git a/ui/qt/models/uat_model.cpp b/ui/qt/models/uat_model.cpp
index 5ae86e9c91..4b7930f6eb 100644
--- a/ui/qt/models/uat_model.cpp
+++ b/ui/qt/models/uat_model.cpp
@@ -256,18 +256,10 @@ bool UatModel::setData(const QModelIndex &index, const QVariant &value, int role
         // The validation status for other columns were also affected by
         // changing this field, mark those as dirty!
         emit dataChanged(this->index(row, updated_cols.first()),
-                         this->index(row, updated_cols.last())
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                         , roles
-#endif
-        );
+                         this->index(row, updated_cols.last()), roles);
     } else {
 
-        emit dataChanged(index, index
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                         , roles
-#endif
-        );
+        emit dataChanged(index, index, roles);
     }
     return true;
 }
@@ -357,11 +349,7 @@ bool UatModel::copyRow(int dst_row, int src_row)
 
     QVector<int> roles;
     roles << Qt::EditRole << Qt::BackgroundRole;
-    emit dataChanged(index(dst_row, 0), index(dst_row, columnCount())
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-                     , roles
-#endif
-    );
+    emit dataChanged(index(dst_row, 0), index(dst_row, columnCount()), roles);
 
     return true;
 }
diff --git a/ui/qt/packet_list.cpp b/ui/qt/packet_list.cpp
index 40c02703e0..a2da5116ef 100644
--- a/ui/qt/packet_list.cpp
+++ b/ui/qt/packet_list.cpp
@@ -1624,9 +1624,7 @@ void PacketList::drawNearOverlay()
     if (!prefs.gui_packet_list_show_minimap) return;
 
     qreal dp_ratio = 1.0;
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
     dp_ratio = overlay_sb_->devicePixelRatio();
-#endif
     int o_height = overlay_sb_->height() * dp_ratio;
     int o_rows = qMin(packet_list_model_->rowCount(), o_height);
     int o_width = (wsApp->fontMetrics().height() * 2 * dp_ratio) + 2; // 2ems + 1-pixel border on either side.
@@ -1695,11 +1693,9 @@ void PacketList::drawFarOverlay()
     if (!prefs.gui_packet_list_show_minimap) return;
 
     QSize groove_size = overlay_sb_->grooveRect().size();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
     qreal dp_ratio = 1.0;
     dp_ratio = overlay_sb_->devicePixelRatio();
     groove_size *= dp_ratio;
-#endif
     int o_width = groove_size.width();
     int o_height = groove_size.height();
     int pl_rows = packet_list_model_->rowCount();
diff --git a/ui/qt/progress_frame.cpp b/ui/qt/progress_frame.cpp
index d3dfb9ef4a..1551c01f96 100644
--- a/ui/qt/progress_frame.cpp
+++ b/ui/qt/progress_frame.cpp
@@ -90,11 +90,9 @@ ProgressFrame::ProgressFrame(QWidget *parent) :
     ui(new Ui::ProgressFrame)
   , terminate_is_stop_(false)
   , stop_flag_(NULL)
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
   , show_timer_(-1)
   , effect_(NULL)
   , animation_(NULL)
-#endif
 #ifdef QWINTASKBARPROGRESS_H
   , update_taskbar_(false)
   , taskbar_progress_(NULL)
@@ -130,11 +128,8 @@ ProgressFrame::ProgressFrame(QWidget *parent) :
             "}"
             );
 
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
     effect_ = new QGraphicsOpacityEffect(this);
     animation_ = new QPropertyAnimation(effect_, "opacity", this);
-#endif
-
     connect(this, SIGNAL(showRequested(bool,bool,gboolean*)),
             this, SLOT(show(bool,bool,gboolean*)));
     hide();
@@ -218,7 +213,6 @@ void ProgressFrame::setValue(int value)
     emit valueChanged(value);
 }
 
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
 void ProgressFrame::timerEvent(QTimerEvent *event)
 {
     if (event->timerId() == show_timer_) {
@@ -238,13 +232,10 @@ void ProgressFrame::timerEvent(QTimerEvent *event)
         QFrame::timerEvent(event);
     }
 }
-#endif
 
 void ProgressFrame::hide()
 {
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
     show_timer_ = -1;
-#endif
     emit setHidden();
     QFrame::hide();
 #ifdef QWINTASKBARPROGRESS_H
@@ -261,9 +252,7 @@ void ProgressFrame::on_stopButton_clicked()
     emit stopLoading();
 }
 
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
 const int show_delay_ = 500; // ms
-#endif
 
 void ProgressFrame::show(bool animate, bool terminate_is_stop, gboolean *stop_flag)
 {
@@ -276,16 +265,11 @@ void ProgressFrame::show(bool animate, bool terminate_is_stop, gboolean *stop_fl
         ui->stopButton->hide();
     }
 
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
     if (animate) {
         show_timer_ = startTimer(show_delay_);
     } else {
         QFrame::show();
     }
-#else
-    Q_UNUSED(animate)
-    QFrame::show();
-#endif
 
 #ifdef QWINTASKBARPROGRESS_H
     // windowHandle() is picky about returning a non-NULL value so we check it
diff --git a/ui/qt/progress_frame.h b/ui/qt/progress_frame.h
index ff5c6dc59b..6747869505 100644
--- a/ui/qt/progress_frame.h
+++ b/ui/qt/progress_frame.h
@@ -17,7 +17,7 @@ namespace Ui {
 class ProgressFrame;
 }
 
-#if defined(Q_OS_WIN) && QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
+#if defined(Q_OS_WIN)
 #include <QWinTaskbarButton>
 #include <QWinTaskbarProgress>
 #endif
@@ -62,9 +62,7 @@ signals:
     void stopLoading();
 
 protected:
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
     void timerEvent(QTimerEvent *event);
-#endif
 
 private:
     Ui::ProgressFrame *ui;
@@ -74,11 +72,9 @@ private:
     QString status_;
     bool terminate_is_stop_;
     gboolean *stop_flag_;
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
     int show_timer_;
     QGraphicsOpacityEffect *effect_;
     QPropertyAnimation *animation_;
-#endif
 #ifdef QWINTASKBARPROGRESS_H
     bool update_taskbar_;
     QWinTaskbarProgress *taskbar_progress_;
diff --git a/ui/qt/proto_tree.cpp b/ui/qt/proto_tree.cpp
index a088b4f876..161b04b8c1 100644
--- a/ui/qt/proto_tree.cpp
+++ b/ui/qt/proto_tree.cpp
@@ -28,9 +28,7 @@
 #include <QStack>
 #include <QUrl>
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
 #include <QWindow>
-#endif
 
 // To do:
 // - Fix "apply as filter" behavior.
@@ -563,13 +561,9 @@ bool ProtoTree::eventFilter(QObject * obj, QEvent * event)
 
                     DragLabel * content = new DragLabel(dfmd->labelText(), this);
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
                     qreal dpr = window()->windowHandle()->devicePixelRatio();
                     QPixmap pixmap(content->size() * dpr);
                     pixmap.setDevicePixelRatio(dpr);
-#else
-                    QPixmap pixmap(content->size());
-#endif
                     content->render(&pixmap);
                     drag->setPixmap(pixmap);
 
diff --git a/ui/qt/rtp_player_dialog.cpp b/ui/qt/rtp_player_dialog.cpp
index 0e53a66c94..ccf719e061 100644
--- a/ui/qt/rtp_player_dialog.cpp
+++ b/ui/qt/rtp_player_dialog.cpp
@@ -82,11 +82,6 @@ enum {
     graph_data_col_ = src_port_col_ // QCPGraph
 };
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-Q_DECLARE_METATYPE(RtpAudioStream *)
-Q_DECLARE_METATYPE(QCPGraph *)
-#endif
-
 #ifdef QT_MULTIMEDIA_LIB
 static const double wf_graph_normal_width_ = 0.5;
 static const double wf_graph_selected_width_ = 2.0;
diff --git a/ui/qt/sctp_chunk_statistics_dialog.cpp b/ui/qt/sctp_chunk_statistics_dialog.cpp
index af9ccee020..b921b72c72 100644
--- a/ui/qt/sctp_chunk_statistics_dialog.cpp
+++ b/ui/qt/sctp_chunk_statistics_dialog.cpp
@@ -27,23 +27,14 @@ SCTPChunkStatisticsDialog::SCTPChunkStatisticsDialog(QWidget *parent, sctp_assoc
             | Qt::WindowMaximizeButtonHint
             | Qt::WindowCloseButtonHint;
     this->setWindowFlags(flags);
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
-    ui->tableWidget->verticalHeader()->setClickable(true);
-    ui->tableWidget->verticalHeader()->setMovable(true);
-#else
     ui->tableWidget->verticalHeader()->setSectionsClickable(true);
     ui->tableWidget->verticalHeader()->setSectionsMovable(true);
-#endif
 
 
     ui->tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
     ui->tableWidget->setSelectionMode(QAbstractItemView::SingleSelection);
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
-    ui->tableWidget->horizontalHeader()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     ui->tableWidget->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
 
     this->setWindowTitle(QString(tr("SCTP Chunk Statistics: %1 Port1 %2 Port2 %3")).arg(cf_get_display_name(cap_file_)).arg(selected_assoc->port1).arg(selected_assoc->port2));
  //   connect(ui->tableWidget->verticalHeader(), SIGNAL(sectionMoved(int,int,int)), this, SLOT(on_sectionMoved(int, int, int)));
diff --git a/ui/qt/simple_dialog.cpp b/ui/qt/simple_dialog.cpp
index 636333c292..97c98d027c 100644
--- a/ui/qt/simple_dialog.cpp
+++ b/ui/qt/simple_dialog.cpp
@@ -20,9 +20,7 @@
 #include <ui/qt/utils/qt_ui_utils.h>
 #include "wireshark_application.h"
 
-#if (QT_VERSION > QT_VERSION_CHECK(5, 2, 0))
 #include <QCheckBox>
-#endif
 #include <QMessageBox>
 #include <QRegExp>
 #include <QTextCodec>
@@ -94,7 +92,6 @@ simple_message_box(ESD_TYPE_E type, gboolean *notagain,
 
     sd.setDetailedText(secondary_msg);
 
-#if (QT_VERSION > QT_VERSION_CHECK(5, 2, 0))
     QCheckBox *cb = NULL;
     if (notagain) {
         cb = new QCheckBox();
@@ -102,15 +99,12 @@ simple_message_box(ESD_TYPE_E type, gboolean *notagain,
         cb->setText(QObject::tr("Don't show this message again."));
         sd.setCheckBox(cb);
     }
-#endif
 
     sd.exec();
 
-#if (QT_VERSION > QT_VERSION_CHECK(5, 2, 0))
     if (notagain && cb) {
         *notagain = cb->isChecked();
     }
-#endif
 }
 
 /*
@@ -161,9 +155,7 @@ simple_error_message_box(const char *msg_format, ...)
 }
 
 SimpleDialog::SimpleDialog(QWidget *parent, ESD_TYPE_E type, int btn_mask, const char *msg_format, va_list ap) :
-#if (QT_VERSION > QT_VERSION_CHECK(5, 2, 0))
     check_box_(0),
-#endif
     message_box_(0)
 {
     gchar *vmessage;
@@ -193,10 +185,7 @@ SimpleDialog::SimpleDialog(QWidget *parent, ESD_TYPE_E type, int btn_mask, const
 
     message_box_ = new QMessageBox(parent);
     message_box_->setTextFormat(Qt::PlainText);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
     message_box_->setTextInteractionFlags(Qt::TextSelectableByMouse);
-#endif
-
 
     switch(type) {
     case ESD_TYPE_ERROR:
@@ -307,9 +296,7 @@ int SimpleDialog::exec()
     }
 
     message_box_->setDetailedText(detailed_text_);
-#if (QT_VERSION > QT_VERSION_CHECK(5, 2, 0))
     message_box_->setCheckBox(check_box_);
-#endif
 
     int status = message_box_->exec();
     delete message_box_;
diff --git a/ui/qt/simple_dialog.h b/ui/qt/simple_dialog.h
index 4bfd3f1465..dd7f11d0eb 100644
--- a/ui/qt/simple_dialog.h
+++ b/ui/qt/simple_dialog.h
@@ -22,9 +22,7 @@
 
 typedef QPair<QString,QString> MessagePair;
 
-#if (QT_VERSION > QT_VERSION_CHECK(5, 2, 0))
 class QCheckBox;
-#endif
 class QMessageBox;
 class QWidget;
 
@@ -37,17 +35,13 @@ public:
 
     static void displayQueuedMessages(QWidget *parent = 0);
     void setDetailedText(QString text) { detailed_text_ = text; }
-#if (QT_VERSION > QT_VERSION_CHECK(5, 2, 0))
     void setCheckBox(QCheckBox *cb) { check_box_ = cb; }
-#endif
     int exec();
 
 private:
     const MessagePair splitMessage(QString &message) const;
     QString detailed_text_;
-#if (QT_VERSION > QT_VERSION_CHECK(5, 2, 0))
     QCheckBox *check_box_;
-#endif
     QMessageBox *message_box_;
 };
 
diff --git a/ui/qt/tcp_stream_dialog.cpp b/ui/qt/tcp_stream_dialog.cpp
index cd70c9a26c..60c1cb80fd 100644
--- a/ui/qt/tcp_stream_dialog.cpp
+++ b/ui/qt/tcp_stream_dialog.cpp
@@ -270,9 +270,7 @@ TCPStreamDialog::TCPStreamDialog(QWidget *parent, capture_file *cf, tcp_graph_ty
     // Duplicate ACK Graph - displays duplicate ack ticks
     // QCustomPlot doesn't have QCPScatterStyle::ssTick so we have to make our own.
     int tick_len = 3;
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
     tick_len *= devicePixelRatio();
-#endif
     QPixmap da_tick_pm = QPixmap(1, tick_len * 2);
     da_tick_pm.fill(Qt::transparent);
     QPainter painter(&da_tick_pm);
diff --git a/ui/qt/uat_dialog.cpp b/ui/qt/uat_dialog.cpp
index deef940beb..2d4a94fd8f 100644
--- a/ui/qt/uat_dialog.cpp
+++ b/ui/qt/uat_dialog.cpp
@@ -60,11 +60,7 @@ UatDialog::UatDialog(QWidget *parent, epan_uat *uat) :
     // very long filenames in the SSL RSA keys dialog, it also results in a
     // vertical scrollbar. Maybe remove this since the editor is not limited to
     // the column width (and overlays other fields if more width is needed)?
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
-    ui->uatTreeView->header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     ui->uatTreeView->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
 
     // start editing as soon as the field is selected or when typing starts
     ui->uatTreeView->setEditTriggers(ui->uatTreeView->editTriggers() |
diff --git a/ui/qt/uat_frame.cpp b/ui/qt/uat_frame.cpp
index ed3d286207..3ead922301 100644
--- a/ui/qt/uat_frame.cpp
+++ b/ui/qt/uat_frame.cpp
@@ -51,11 +51,7 @@ UatFrame::UatFrame(QWidget *parent) :
     // very long filenames in the SSL RSA keys dialog, it also results in a
     // vertical scrollbar. Maybe remove this since the editor is not limited to
     // the column width (and overlays other fields if more width is needed)?
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
-    ui->uatTreeView->header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
     ui->uatTreeView->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
 
     // start editing as soon as the field is selected or when typing starts
     ui->uatTreeView->setEditTriggers(ui->uatTreeView->editTriggers() |
diff --git a/ui/qt/utils/qt_ui_utils.cpp b/ui/qt/utils/qt_ui_utils.cpp
index 13553e96c5..ea176946ff 100644
--- a/ui/qt/utils/qt_ui_utils.cpp
+++ b/ui/qt/utils/qt_ui_utils.cpp
@@ -34,11 +34,6 @@
 #include <QUrl>
 #include <QUuid>
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-// Qt::escape
-#include <QTextDocument>
-#endif
-
 /* Make the format_size_flags_e enum usable in C++ */
 format_size_flags_e operator|(format_size_flags_e lhs, format_size_flags_e rhs) {
     return (format_size_flags_e) ((int)lhs| (int)rhs);
@@ -169,11 +164,7 @@ const QString time_t_to_qstring(time_t ti_time)
 }
 
 QString html_escape(const QString plain_string) {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    return Qt::escape(plain_string);
-#else
     return plain_string.toHtmlEscaped();
-#endif
 }
 
 
diff --git a/ui/qt/widgets/byte_view_text.cpp b/ui/qt/widgets/byte_view_text.cpp
index 2a758d14e2..7717067a87 100644
--- a/ui/qt/widgets/byte_view_text.cpp
+++ b/ui/qt/widgets/byte_view_text.cpp
@@ -229,11 +229,9 @@ void ByteViewText::paintEvent(QPaintEvent *)
         QColor ho_color = palette().text().color();
         if (marked_byte_offset_ < 0) {
             hover_alpha = 0.3;
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
             if (devicePixelRatio() > 1) {
                 pen_width = 0.5;
             }
-#endif
         }
         ho_pen.setWidthF(pen_width);
         ho_color.setAlphaF(hover_alpha);
diff --git a/ui/qt/widgets/drag_drop_toolbar.cpp b/ui/qt/widgets/drag_drop_toolbar.cpp
index bb5bbc9481..67dfd4a26d 100644
--- a/ui/qt/widgets/drag_drop_toolbar.cpp
+++ b/ui/qt/widgets/drag_drop_toolbar.cpp
@@ -20,9 +20,7 @@
 #include <QLayout>
 #include <QMimeData>
 #include <QMouseEvent>
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
 #include <QWindow>
-#endif
 
 #define drag_drop_toolbar_action_ "drag_drop_toolbar_action_"
 
@@ -122,13 +120,10 @@ bool DragDropToolBar::eventFilter(QObject * obj, QEvent * event)
             QDrag * drag = new QDrag(this);
             drag->setMimeData(temd);
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
             qreal dpr = window()->windowHandle()->devicePixelRatio();
             QPixmap pixmap(lbl->size() * dpr);
             pixmap.setDevicePixelRatio(dpr);
-#else
-            QPixmap pixmap(lbl->size());
-#endif
+
             lbl->render(&pixmap);
             drag->setPixmap(pixmap);
 
diff --git a/ui/qt/widgets/find_line_edit.cpp b/ui/qt/widgets/find_line_edit.cpp
index 74acb930c8..9fc0616bd5 100644
--- a/ui/qt/widgets/find_line_edit.cpp
+++ b/ui/qt/widgets/find_line_edit.cpp
@@ -18,6 +18,9 @@ void FindLineEdit::contextMenuEvent(QContextMenuEvent *event)
 {
     QMenu *menu = createStandardContextMenu();
 
+    /* This version check is implemented, because using this function leads to using
+     * a regular expression for search in follow_stream_dialog.cpp as well as
+     * show_packet_bytes_dialog.cpp. Both instances are not compatible with < 5.3 */
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 3, 0))
     QAction *action;
 
diff --git a/ui/qt/widgets/overlay_scroll_bar.cpp b/ui/qt/widgets/overlay_scroll_bar.cpp
index 95b9e2de69..0b66a88ec1 100644
--- a/ui/qt/widgets/overlay_scroll_bar.cpp
+++ b/ui/qt/widgets/overlay_scroll_bar.cpp
@@ -105,9 +105,7 @@ void OverlayScrollBar::setNearOverlayImage(QImage &overlay_image, int packet_cou
 
     if (old_width != packet_map_img_.width()) {
         qreal dp_ratio = 1.0;
-    #if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
         dp_ratio = devicePixelRatio();
-    #endif
 
         packet_map_width_ = packet_map_img_.width() / dp_ratio;
 
@@ -119,9 +117,7 @@ void OverlayScrollBar::setNearOverlayImage(QImage &overlay_image, int packet_cou
 void OverlayScrollBar::setMarkedPacketImage(QImage &mp_image)
 {
     qreal dp_ratio = 1.0;
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
     dp_ratio = devicePixelRatio();
-#endif
 
     marked_packet_img_ = mp_image;
     marked_packet_width_ = mp_image.width() / dp_ratio;
@@ -151,10 +147,8 @@ void OverlayScrollBar::paintEvent(QPaintEvent *event)
 {
     qreal dp_ratio = 1.0;
     QSize pm_size(packet_map_width_, geometry().height());
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
     dp_ratio = devicePixelRatio();
     pm_size *= dp_ratio;
-#endif
 
     QPainter painter(this);
 
@@ -190,9 +184,7 @@ void OverlayScrollBar::paintEvent(QPaintEvent *event)
         pm_painter.restore();
 
         // Draw the map.
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
         packet_map.setDevicePixelRatio(dp_ratio);
-#endif
         painter.drawImage(0, 0, packet_map);
     }
 }
@@ -207,12 +199,10 @@ bool OverlayScrollBar::eventFilter(QObject *watched, QEvent *event)
 
         if (!marked_packet_img_.isNull()) {
             QRect groove_rect = grooveRect();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
             qreal dp_ratio = 1.0;
             dp_ratio = devicePixelRatio();
             groove_rect.setTopLeft(groove_rect.topLeft() * dp_ratio);
             groove_rect.setSize(groove_rect.size() * dp_ratio);
-#endif
 
             QImage marked_map(groove_rect.width(), groove_rect.height(), QImage::Format_ARGB32_Premultiplied);
             marked_map.fill(Qt::transparent);
@@ -223,9 +213,7 @@ bool OverlayScrollBar::eventFilter(QObject *watched, QEvent *event)
             QRect far_dest(0, 0, groove_rect.width(), groove_rect.height());
             mm_painter.drawImage(far_dest, marked_packet_img_.scaled(far_dest.size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
 
-    #if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
             marked_map.setDevicePixelRatio(dp_ratio);
-    #endif
             QPainter painter(&child_sb_);
             painter.drawImage(groove_rect.left(), groove_rect.top(), marked_map);
         }
diff --git a/ui/qt/widgets/overlay_scroll_bar.h b/ui/qt/widgets/overlay_scroll_bar.h
index a358d9f958..53c014c87e 100644
--- a/ui/qt/widgets/overlay_scroll_bar.h
+++ b/ui/qt/widgets/overlay_scroll_bar.h
@@ -48,9 +48,6 @@ public:
     QRect grooveRect();
 
 public slots:
-    // Qt 4's QScrollBar::setRange isn't a slot. We can't wrap this in
-    //#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    // because Qt 4's MOC doesn't support macros.
     void setChildRange(int min, int max) { child_sb_.setRange(min, max); }
 
 protected:
diff --git a/ui/qt/wireless_timeline.cpp b/ui/qt/wireless_timeline.cpp
index 59d084cdeb..ccc5d6bc11 100644
--- a/ui/qt/wireless_timeline.cpp
+++ b/ui/qt/wireless_timeline.cpp
@@ -111,11 +111,7 @@ static void accumulate_rgb(float rgb[TIMELINE_HEIGHT][3], int height, int dfilte
 
 void WirelessTimeline::mousePressEvent(QMouseEvent *event)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
     start_x = last_x = event->localPos().x();
-#else
-    start_x = last_x = event->posF().x();
-#endif
 }
 
 
@@ -124,13 +120,8 @@ void WirelessTimeline::mouseMoveEvent(QMouseEvent *event)
     if (event->buttons() == Qt::NoButton)
         return;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
     qreal offset = event->localPos().x() - last_x;
     last_x = event->localPos().x();
-#else
-    qreal offset = event->posF().x() - last_x;
-    last_x = event->posF().x();
-#endif
 
     qreal shift = ((qreal) (end_tsf - start_tsf))/width() * offset;
     start_tsf -= shift;
@@ -146,11 +137,7 @@ void WirelessTimeline::mouseMoveEvent(QMouseEvent *event)
 
 void WirelessTimeline::mouseReleaseEvent(QMouseEvent *event)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
     QPointF localPos = event->localPos();
-#else
-    QPointF localPos = event->posF();
-#endif
     qreal offset = localPos.x() - start_x;
 
     /* if this was a drag, ignore it */
@@ -491,10 +478,7 @@ WirelessTimeline::paintEvent(QPaintEvent *qpe)
     QPainter p(this);
 
     // painting is done in device pixels in the x axis, get the ratio here
-    float ratio = 1.0;
-#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
-    ratio = p.device()->devicePixelRatio();
-#endif
+    float ratio = p.device()->devicePixelRatio();
 
     unsigned int packet;
     double zoom;
diff --git a/ui/qt/wireshark_application.cpp b/ui/qt/wireshark_application.cpp
index 5e110f850a..ad30ed10f8 100644
--- a/ui/qt/wireshark_application.cpp
+++ b/ui/qt/wireshark_application.cpp
@@ -87,10 +87,8 @@
 #include <QUrl>
 #include <qmath.h>
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
 #include <QFontDatabase>
 #include <QMimeDatabase>
-#endif
 
 #ifdef _MSC_VER
 #pragma warning(pop)
@@ -109,8 +107,6 @@ static QHash<int, QList<QAction *> > removed_menu_groups_;
 
 QString WiresharkApplication::window_title_separator_ = QString::fromUtf8(" " UTF8_MIDDLE_DOT " ");
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-
 // QMimeDatabase parses a large-ish XML file and can be slow to initialize.
 // Do so in a worker thread as early as possible.
 // https://github.com/lxde/pcmanfm-qt/issues/415
@@ -133,7 +129,6 @@ private:
         QFontDatabase font_db;
     }
 };
-#endif
 
 void
 topic_action(topic_action_e action)
@@ -496,11 +491,7 @@ void WiresharkApplication::applyCustomColorsFromRecent()
     for (GList *custom_color = recent.custom_colors; custom_color; custom_color = custom_color->next) {
         QRgb rgb = QString((const char *)custom_color->data).toUInt(&ok, 16);
         if (ok) {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-            QColorDialog::setCustomColor(i++, rgb);
-#else
             QColorDialog::setCustomColor(i++, QColor(rgb));
-#endif
         }
     }
 }
@@ -523,11 +514,7 @@ void WiresharkApplication::storeCustomColorsInRecent()
         prefs_clear_string_list(recent.custom_colors);
         recent.custom_colors = NULL;
         for (int i = 0; i < QColorDialog::customCount(); i++) {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-            QRgb rgb = QColorDialog::customColor(i);
-#else
             QRgb rgb = QColorDialog::customColor(i).rgb();
-#endif
             recent.custom_colors = g_list_append(recent.custom_colors, g_strdup_printf("%08x", rgb));
         }
     }
@@ -736,12 +723,10 @@ WiresharkApplication::WiresharkApplication(int &argc,  char **argv) :
     wsApp = this;
     setApplicationName("Wireshark");
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
     MimeDatabaseInitThread *mime_db_init_thread = new(MimeDatabaseInitThread);
     QThreadPool::globalInstance()->start(mime_db_init_thread);
     FontDatabaseInitThread *font_db_init_thread = new (FontDatabaseInitThread);
     QThreadPool::globalInstance()->start(font_db_init_thread);
-#endif
 
     Q_INIT_RESOURCE(about);
     Q_INIT_RESOURCE(i18n);
@@ -755,9 +740,7 @@ WiresharkApplication::WiresharkApplication(int &argc,  char **argv) :
     ws_load_library("riched20.dll");
 #endif // Q_OS_WIN
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 1, 0))
     setAttribute(Qt::AA_UseHighDpiPixmaps);
-#endif
     //
     // XXX - this means we try to check for the existence of all files
     // in the recent list every 2 seconds; that causes noticeable network
diff --git a/wireshark-qt.cpp b/wireshark-qt.cpp
index 7b73e204fa..b56c4bbdb7 100644
--- a/wireshark-qt.cpp
+++ b/wireshark-qt.cpp
@@ -110,10 +110,6 @@
 
 #include "epan/crypt/dot11decrypt_ws.h"
 
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
-#include <QTextCodec>
-#endif
-
 #include <ui/qt/utils/qt_ui_utils.h>
 
 #define INVALID_OPTION 1
@@ -259,7 +255,6 @@ get_wireshark_runtime_info(GString *str)
 #endif
 }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
 static void
 g_log_message_handler(QtMsgType type, const QMessageLogContext &, const QString &msg)
 {
@@ -286,7 +281,6 @@ g_log_message_handler(QtMsgType type, const QMessageLogContext &, const QString
     }
     g_log(LOG_DOMAIN_MAIN, log_level, "%s", qUtf8Printable(msg));
 }
-#endif
 
 #ifdef HAVE_LIBPCAP
 /*  Check if there's something important to tell the user during startup.
@@ -403,16 +397,6 @@ int main(int argc, char *qt_argv[])
 #endif /* DEBUG_STARTUP_TIME */
     cmdarg_err_init(wireshark_cmdarg_err, wireshark_cmdarg_err_cont);
 
-    // In Qt 5, C strings are treated always as UTF-8 when converted to
-    // QStrings; in Qt 4, the codec must be set to make that happen
-#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
-    // Hopefully we won't have to use QString::fromUtf8() in as many places.
-    QTextCodec *utf8codec = QTextCodec::codecForName("UTF-8");
-    QTextCodec::setCodecForCStrings(utf8codec);
-    // XXX - QObject doesn't *have* a tr method in 5.0, as far as I can see...
-    QTextCodec::setCodecForTr(utf8codec);
-#endif
-
     /* Set the C-language locale to the native environment. */
     setlocale(LC_ALL, "");
 
@@ -609,9 +593,7 @@ int main(int argc, char *qt_argv[])
     }
 
     set_console_log_handler();
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
     qInstallMessageHandler(g_log_message_handler);
-#endif
 #ifdef DEBUG_STARTUP_TIME
     g_log(LOG_DOMAIN_MAIN, G_LOG_LEVEL_INFO, "set_console_log_handler, elapsed time %" G_GUINT64_FORMAT " us \n", g_get_monotonic_time() - start_time);
 #endif