Simplify Qt version checks by requiring 5.4

CMakeLists.txt

@@ -310,8 +310,8 @@ endif (USE_DBUS)
 ##############################################################################
 ## Qt5 setup setup
 if (ENABLE_QT)
-    message(STATUS "Qt launcher enabled, checking for Qt 5.3 / qmake")
+    message(STATUS "Qt launcher enabled, checking for Qt 5.4 / qmake")
-    find_package(Qt5 5.3 COMPONENTS Widgets Network Qml QuickWidgets)
+    find_package(Qt5 5.4 COMPONENTS Widgets Network Qml QuickWidgets)
     if (Qt5Widgets_FOUND)
         message(STATUS "Will enable Qt launcher GUI")
         message(STATUS "  Qt5Widgets version: ${Qt5Widgets_VERSION_STRING}")

src/GUI/ExtraSettingsSection.cxx

@@ -25,11 +25,8 @@ ExtraSettingsSection::ExtraSettingsSection(QWidget* pr) :
     topLevelVBox->addWidget(prompt);
     m_argsEdit = new QTextEdit(this);
     m_argsEdit->setAcceptRichText(false);
-
-#if QT_VERSION >= 0x050300
-    // don't require Qt 5.3
     m_argsEdit->setPlaceholderText("--option=value --prop:/sim/name=value");
-#endif
+
     topLevelVBox->addWidget(m_argsEdit);
 
     insertSettingsHeader();

src/GUI/LauncherMainWindow.cxx

@@ -99,10 +99,7 @@ LauncherMainWindow::LauncherMainWindow() :
     connect(viewCommandLineAction, &QAction::triggered,
             this, &LauncherMainWindow::onViewCommandLine);
 
-#if QT_VERSION >= 0x050200
     m_ui->aircraftFilter->setClearButtonEnabled(true);
-#endif
-
     m_serversModel = new MPServersModel(this);
     m_serversModel->refresh();
 

src/GUI/PreviewWindow.cxx

@@ -5,10 +5,6 @@
 #include <QNetworkReply>
 #include <QDebug>
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 5, 0)
-#define qInfo       qDebug
-#endif
-
 const int BORDER_SIZE = 16;
 
 PreviewWindow::PreviewWindow(QWidget *parent)
@@ -30,7 +26,6 @@ void PreviewWindow::setUrls(QVariantList urls)
     Q_FOREACH (QVariant v, urls) {
         QUrl url = v.toUrl();
         QNetworkReply* reply = m_netAccess->get(QNetworkRequest(url));
-        qInfo() << "requesting:" << url;
         connect(reply, &QNetworkReply::finished, this, &PreviewWindow::onDownloadFinished);
         connect(reply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(onDownloadError(QNetworkReply::NetworkError)));
     }

src/GUI/SettingsWidgets.cxx

@@ -498,11 +498,7 @@ void SettingsText::setValue(QString newVal)
 
 QString SettingsText::placeholder() const
 {
-#if QT_VERSION >= 0x050300
     return m_edit->placeholderText();
-#else
-    return QString();
-#endif
 }
 
 QString SettingsText::validation() const
@@ -515,10 +511,7 @@ void SettingsText::setPlaceholder(QString hold)
     if (placeholder() == hold)
         return;
 
-#if QT_VERSION >= 0x050300
-    // don't require Qt 5.3
     m_edit->setPlaceholderText(hold);
-#endif
     emit placeholderChanged(hold);
 }
 

src/Viewer/GraphicsWindowQt5.cpp

@@ -144,18 +144,14 @@ GLWindow::GLWindow()
     : QWindow()
 {
     _devicePixelRatio = 1.0;
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
     connect(this, &QWindow::screenChanged, this, &GLWindow::onScreenChanged);
     onScreenChanged();
-#endif
 }
 
 void GLWindow::onScreenChanged()
 {
     qWarning() << Q_FUNC_INFO << "screen changed";
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
     _devicePixelRatio = screen()->devicePixelRatio();
-#endif
 
     if (_isPrimaryWindow) {
         // allow PUI and Canvas to be scaled
@@ -461,9 +457,7 @@ QSurfaceFormat GraphicsWindowQt5::traits2qSurfaceFormat( const osg::GraphicsCont
     format.setSwapBehavior( traits->doubleBuffer ?
         QSurfaceFormat::DoubleBuffer :
         QSurfaceFormat::DefaultSwapBehavior);
-#if QT_VERSION >= 0x050300
     format.setSwapInterval( traits->vsync ? 1 : 0 );
-#endif
     format.setStereo( traits->quadBufferStereo ? 1 : 0 );
 
     return format;
@@ -481,9 +475,7 @@ void GraphicsWindowQt5::qSurfaceFormat2traits( const QSurfaceFormat& format, osg
 
     traits->quadBufferStereo = format.stereo();
     traits->doubleBuffer = (format.swapBehavior() == QSurfaceFormat::DoubleBuffer);
-#if QT_VERSION >= 0x050300
     traits->vsync = format.swapInterval() >= 1;
-#endif
 }
 
 osg::GraphicsContext::Traits* GraphicsWindowQt5::createTraits( const QWindow* window )