Remove Qt version checks.

Qt 5.3 is the minimum requirement these days. Remove all fallback code
from sources and project files.

Change-Id: If6188a471197acadda4d6baee71804ba1a8026c6
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

doc/doc.pri

-HELPGENERATOR = $$targetPath($$[QT_INSTALL_BINS]/qhelpgenerator) -platform minimal
-QDOC_BIN = $$targetPath($$[QT_INSTALL_BINS]/qdoc)
+HELPGENERATOR = $$shell_path($$[QT_INSTALL_BINS]/qhelpgenerator) -platform minimal
+QDOC_BIN = $$shell_path($$[QT_INSTALL_BINS]/qdoc)
 QDOC_GLOBAL = QT_INSTALL_DOCS=$$[QT_INSTALL_DOCS/src] QDOC_INDEX_DIR=$$[QT_INSTALL_DOCS]
 COMPAT =
 
@@ -90,6 +90,6 @@ QMAKE_EXTRA_TARGETS += html_docs dev_html_docs html_docs_online dev_html_docs_on
 OTHER_FILES = $$HELP_DEP_FILES $$DEV_HELP_DEP_FILES
 
 fixnavi.commands = \
-    cd $$targetPath($$PWD) && \
+    cd $$shell_path($$PWD) && \
     perl fixnavi.pl -Dqcmanual -Dqtquick src
 QMAKE_EXTRA_TARGETS += fixnavi

qtcreator.pri

@@ -8,14 +8,6 @@ BINARY_ARTIFACTS_BRANCH = master
 # enable c++11
 CONFIG += c++11
 
-defineReplace(cleanPath) {
-    return($$clean_path($$1))
-}
-
-defineReplace(targetPath) {
-    return($$shell_path($$1))
-}
-
 defineReplace(qtLibraryName) {
    unset(LIBRARY_NAME)
    LIBRARY_NAME = $$1
@@ -78,7 +70,7 @@ IDE_SOURCE_TREE = $$PWD
 isEmpty(IDE_BUILD_TREE) {
     sub_dir = $$_PRO_FILE_PWD_
     sub_dir ~= s,^$$re_escape($$PWD),,
-    IDE_BUILD_TREE = $$cleanPath($$OUT_PWD)
+    IDE_BUILD_TREE = $$clean_path($$OUT_PWD)
     IDE_BUILD_TREE ~= s,$$re_escape($$sub_dir)$,,
 }
 IDE_APP_PATH = $$IDE_BUILD_TREE/bin

share/qtcreator/static.pro

@@ -88,7 +88,7 @@ defineReplace(stripSrcResourceDir) {
     } else {
         !contains(1, ^/.*):1 = $$OUT_PWD/$$1
     }
-    out = $$cleanPath($$1)
+    out = $$clean_path($$1)
     out ~= s|^$$re_escape($$SRCRESOURCEDIR)||$$i_flag
     return($$out)
 }

share/qtcreator/translations/translations.pro

@@ -10,10 +10,10 @@ defineReplace(prependAll) {
     return($$result)
 }
 
-XMLPATTERNS = $$targetPath($$[QT_INSTALL_BINS]/xmlpatterns)
-LUPDATE = $$targetPath($$[QT_INSTALL_BINS]/lupdate) -locations relative -no-ui-lines -no-sort
-LRELEASE = $$targetPath($$[QT_INSTALL_BINS]/lrelease)
-LCONVERT = $$targetPath($$[QT_INSTALL_BINS]/lconvert)
+XMLPATTERNS = $$shell_path($$[QT_INSTALL_BINS]/xmlpatterns)
+LUPDATE = $$shell_path($$[QT_INSTALL_BINS]/lupdate) -locations relative -no-ui-lines -no-sort
+LRELEASE = $$shell_path($$[QT_INSTALL_BINS]/lrelease)
+LCONVERT = $$shell_path($$[QT_INSTALL_BINS]/lconvert)
 
 wd = $$replace(IDE_SOURCE_TREE, /, $$QMAKE_DIR_SEP)
 

src/app/main.cpp

@@ -309,9 +309,7 @@ int main(int argc, char **argv)
     QtSystemExceptionHandler systemExceptionHandler;
 #endif
 
-#if QT_VERSION >= 0x050100
     app.setAttribute(Qt::AA_UseHighDpiPixmaps);
-#endif
 
     // Manually determine -settingspath command line option
     // We can't use the regular way of the plugin manager, because that needs to parse plugin meta data
@@ -365,23 +363,14 @@ int main(int argc, char **argv)
     QTranslator translator;
     QTranslator qtTranslator;
     QStringList uiLanguages;
-// uiLanguages crashes on Windows with 4.8.0 release builds
-#if (QT_VERSION >= 0x040801) || (QT_VERSION >= 0x040800 && !defined(Q_OS_WIN))
     uiLanguages = QLocale::system().uiLanguages();
-#else
-    uiLanguages << QLocale::system().name();
-#endif
     QString overrideLanguage = settings->value(QLatin1String("General/OverrideLanguage")).toString();
     if (!overrideLanguage.isEmpty())
         uiLanguages.prepend(overrideLanguage);
     const QString &creatorTrPath = QCoreApplication::applicationDirPath()
             + QLatin1String(SHARE_PATH "/translations");
     foreach (QString locale, uiLanguages) {
-#if (QT_VERSION >= 0x050000)
         locale = QLocale(locale).name();
-#else
-        locale.replace(QLatin1Char('-'), QLatin1Char('_')); // work around QTBUG-25973
-#endif
         if (translator.load(QLatin1String("qtcreator_") + locale, creatorTrPath)) {
             const QString &qtTrPath = QLibraryInfo::location(QLibraryInfo::TranslationsPath);
             const QString &qtTrFile = QLatin1String("qt_") + locale;

src/libs/cplusplus/cplusplus-lib.pri

@@ -8,7 +8,7 @@ INCLUDEPATH *= $$IDE_SOURCE_TREE/src/libs/3rdparty
 
 include(../3rdparty/cplusplus/cplusplus.pri)
 
-greaterThan(QT_MAJOR_VERSION, 4): QT += concurrent
+QT += concurrent
 
 #DEFINES += DEBUG_INCLUDE_GUARD_TRACKING
 

src/libs/extensionsystem/pluginmanager.cpp

@@ -714,11 +714,7 @@ void PluginManager::startTests()
         const QMetaObject *metaObject = pluginSpec->plugin()->metaObject();
 
         for (int i = metaObject->methodOffset(); i < metaObject->methodCount(); ++i) {
-#if QT_VERSION >= 0x050000
             const QByteArray signature = metaObject->method(i).methodSignature();
-#else
-            const QByteArray signature = metaObject->method(i).signature();
-#endif
             if (signature.startsWith("test") && !signature.endsWith("_data()")) {
                 const QString method = QString::fromLatin1(signature);
                 const QString methodName = method.left(method.size() - 2);

src/libs/qmljs/qmljsinterpreter.cpp

@@ -248,13 +248,8 @@ CppComponentValue::CppComponentValue(FakeMetaObject::ConstPtr metaObject, const
 
 CppComponentValue::~CppComponentValue()
 {
-#if QT_VERSION >= 0x050000
     delete m_metaSignatures.load();
     delete m_signalScopes.load();
-#else
-    delete m_metaSignatures;
-    delete m_signalScopes;
-#endif
 }
 
 static QString generatedSlotName(const QString &base)
@@ -292,11 +287,7 @@ void CppComponentValue::processMembers(MemberProcessor *processor) const
     QSet<QString> explicitSignals;
 
     // make MetaFunction instances lazily when first needed
-#if QT_VERSION >= 0x050000
     QList<const Value *> *signatures = m_metaSignatures.load();
-#else
-    QList<const Value *> *signatures = m_metaSignatures;
-#endif
     if (!signatures) {
         signatures = new QList<const Value *>;
         signatures->reserve(m_metaObject->methodCount());
@@ -304,11 +295,7 @@ void CppComponentValue::processMembers(MemberProcessor *processor) const
             signatures->append(new Internal::MetaFunction(m_metaObject->method(index), valueOwner()));
         if (!m_metaSignatures.testAndSetOrdered(0, signatures)) {
             delete signatures;
-#if QT_VERSION >= 0x050000
             signatures = m_metaSignatures.load();
-#else
-            signatures = m_metaSignatures;
-#endif
         }
     }
 
@@ -536,11 +523,7 @@ const QmlEnumValue *CppComponentValue::getEnumValue(const QString &typeName, con
 
 const ObjectValue *CppComponentValue::signalScope(const QString &signalName) const
 {
-#if QT_VERSION >= 0x050000
     QHash<QString, const ObjectValue *> *scopes = m_signalScopes.load();
-#else
-    QHash<QString, const ObjectValue *> *scopes = m_signalScopes;
-#endif
     if (!scopes) {
         scopes = new QHash<QString, const ObjectValue *>;
         // usually not all methods are signals
@@ -566,11 +549,7 @@ const ObjectValue *CppComponentValue::signalScope(const QString &signalName) con
         }
         if (!m_signalScopes.testAndSetOrdered(0, scopes)) {
             delete scopes;
-#if QT_VERSION >= 0x050000
             scopes = m_signalScopes.load();
-#else
-            scopes = m_signalScopes;
-#endif
         }
     }
 

src/libs/qmljs/qmljsmodelmanagerinterface.cpp

@@ -120,10 +120,8 @@ ModelManagerInterface::ModelManagerInterface(QObject *parent)
 
     m_defaultProjectInfo.qtImportsPath = QFileInfo(
                 QLibraryInfo::location(QLibraryInfo::ImportsPath)).canonicalFilePath();
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
     m_defaultProjectInfo.qtQmlPath = QFileInfo(
                 QLibraryInfo::location(QLibraryInfo::Qml2ImportsPath)).canonicalFilePath();
-#endif
 
     m_defaultImportPaths << environmentImportPaths();
     updateImportPaths();

src/libs/qmljs/qmljsplugindumper.cpp

@@ -262,11 +262,7 @@ static void printParseWarnings(const QString &libraryPath, const QString &warnin
 static QString qmlPluginDumpErrorMessage(QProcess *process)
 {
     QString errorMessage;
-#if QT_VERSION >= 0x050000
     const QString binary = QDir::toNativeSeparators(process->program());
-#else
-    const QString binary = QLatin1String("qmlplugindump");
-#endif
     switch (process->error()) {
     case QProcess::FailedToStart:
         errorMessage = PluginDumper::tr("\"%1\" failed to start: %2").arg(binary, process->errorString());
@@ -286,9 +282,7 @@ static QString qmlPluginDumpErrorMessage(QProcess *process)
             errorMessage = PluginDumper::tr("\"%1\" returned exit code %2.").arg(binary).arg(process->exitCode());
         break;
     }
-#if QT_VERSION >= 0x050000
     errorMessage += QLatin1Char('\n') + PluginDumper::tr("Arguments: %1").arg(process->arguments().join(QLatin1Char(' ')));
-#endif
     if (process->error() != QProcess::FailedToStart) {
         const QString stdErr = QString::fromLocal8Bit(process->readAllStandardError());
         if (!stdErr.isEmpty()) {

src/libs/utils/algorithm.h

@@ -30,21 +30,11 @@
 #ifndef ALGORITHM_H
 #define ALGORITHM_H
 
+#include <qcompilerdetection.h> // for Q_REQUIRED_RESULT
+
 #include <algorithm>
 #include <functional>
 
-#if QT_VERSION < 0x050000
-    #ifndef Q_REQUIRED_RESULT
-    # if defined(Q_CC_GNU)
-    #   define Q_REQUIRED_RESULT __attribute__ ((warn_unused_result))
-    # else
-    #   define Q_REQUIRED_RESULT
-    # endif
-    #endif
-#else
-    #include <qcompilerdetection.h> // for Q_REQUIRED_RESULT
-#endif
-
 namespace Utils
 {
 //////////////////

src/libs/utils/consoleprocess_p.h

@@ -43,11 +43,7 @@ class QTimer;
 QT_END_NAMESPACE
 
 #ifdef Q_OS_WIN
-#  if QT_VERSION >= 0x050000
-#    include <QWinEventNotifier>
-#  else
-#    include <private/qwineventnotifier_p.h>
-#  endif
+#  include <QWinEventNotifier>
 #  include <windows.h>
 #endif
 

src/libs/utils/detailsbutton.cpp

@@ -32,15 +32,12 @@
 #include <utils/hostosinfo.h>
 
 #include <QGraphicsOpacityEffect>
+#include <QGuiApplication>
 #include <QPropertyAnimation>
 #include <QPaintEvent>
 #include <QPainter>
 #include <QStyleOption>
 
-#if QT_VERSION >= 0x050100
-#include <QGuiApplication>
-#endif
-
 using namespace Utils;
 
 FadingWidget::FadingWidget(QWidget *parent) :
@@ -127,19 +124,12 @@ void DetailsButton::paintEvent(QPaintEvent *e)
     if (!HostOsInfo::isMacHost() && !isDown() && m_fader > 0)
         p.fillRect(rect().adjusted(1, 1, -2, -2), QColor(255, 255, 255, int(m_fader*180)));
 
-    qreal checkedPixmapRatio = 1.0;
-    qreal uncheckedPixmapRatio = 1.0;
-#if QT_VERSION >= 0x050100
-    checkedPixmapRatio = m_checkedPixmap.devicePixelRatio();
-    uncheckedPixmapRatio = m_uncheckedPixmap.devicePixelRatio();
-#endif
-
     if (isChecked()) {
-        if (m_checkedPixmap.isNull() || m_checkedPixmap.size() / checkedPixmapRatio != contentsRect().size())
+        if (m_checkedPixmap.isNull() || m_checkedPixmap.size() / m_checkedPixmap.devicePixelRatio() != contentsRect().size())
             m_checkedPixmap = cacheRendering(contentsRect().size(), true);
         p.drawPixmap(contentsRect(), m_checkedPixmap);
     } else {
-        if (m_uncheckedPixmap.isNull() || m_uncheckedPixmap.size() / uncheckedPixmapRatio != contentsRect().size())
+        if (m_uncheckedPixmap.isNull() || m_uncheckedPixmap.size() / m_uncheckedPixmap.devicePixelRatio() != contentsRect().size())
             m_uncheckedPixmap = cacheRendering(contentsRect().size(), false);
         p.drawPixmap(contentsRect(), m_uncheckedPixmap);
     }
@@ -156,14 +146,9 @@ QPixmap DetailsButton::cacheRendering(const QSize &size, bool checked)
     lg.setCoordinateMode(QGradient::ObjectBoundingMode);
     lg.setFinalStop(0, 1);
 
-    qreal pixelRatio = 1.0;
-#if QT_VERSION >= 0x050100
-    pixelRatio = devicePixelRatio();
-#endif
+    const qreal pixelRatio = devicePixelRatio();
     QPixmap pixmap(size * pixelRatio);
-#if QT_VERSION >= 0x050100
     pixmap.setDevicePixelRatio(pixelRatio);
-#endif
     pixmap.fill(Qt::transparent);
     QPainter p(&pixmap);
     p.setRenderHint(QPainter::Antialiasing, true);

src/libs/utils/fancylineedit.cpp

@@ -498,10 +498,7 @@ IconButton::IconButton(QWidget *parent)
 
 void IconButton::paintEvent(QPaintEvent *)
 {
-    qreal pixmapRatio = 1.0;
-#if QT_VERSION >= 0x050100
-    pixmapRatio = m_pixmap.devicePixelRatio();
-#endif
+    const qreal pixmapRatio = m_pixmap.devicePixelRatio();
     QStylePainter painter(this);
     QRect pixmapRect = QRect(0, 0, m_pixmap.width()/pixmapRatio, m_pixmap.height()/pixmapRatio);
     pixmapRect.moveCenter(rect().center());
@@ -541,10 +538,7 @@ void IconButton::animateShow(bool visible)
 
 QSize IconButton::sizeHint() const
 {
-    qreal pixmapRatio = 1.0;
-#if QT_VERSION >= 0x050100
-    pixmapRatio = m_pixmap.devicePixelRatio();
-#endif
+    const qreal pixmapRatio = m_pixmap.devicePixelRatio();
     return QSize(m_pixmap.width()/pixmapRatio, m_pixmap.height()/pixmapRatio);
 }
 

src/libs/utils/stylehelper.cpp

@@ -349,16 +349,6 @@ void StyleHelper::menuGradient(QPainter *painter, const QRect &spanRect, const Q
     }
 }
 
-static qreal pixmapDevicePixelRatio(const QPixmap &pixmap)
-{
-#if QT_VERSION > 0x050000
-    return pixmap.devicePixelRatio();
-#else
-    Q_UNUSED(pixmap);
-    return 1.0;
-#endif
-}
-
 // Draws a cached pixmap with shadow
 void StyleHelper::drawIconWithShadow(const QIcon &icon, const QRect &rect,
                                      QPainter *p, QIcon::Mode iconMode, int dipRadius, const QColor &color, const QPoint &dipOffset)
@@ -373,7 +363,7 @@ void StyleHelper::drawIconWithShadow(const QIcon &icon, const QRect &rect,
         // different than 1. The shadow drawing caluculations are done in device
         // pixels.
         QPixmap px = icon.pixmap(rect.size());
-        int devicePixelRatio = qCeil(pixmapDevicePixelRatio(px));
+        int devicePixelRatio = qCeil(px.devicePixelRatio());
         int radius = dipRadius * devicePixelRatio;
         QPoint offset = dipOffset * devicePixelRatio;
         cache = QPixmap(px.size() + QSize(radius * 2, radius * 2));
@@ -428,14 +418,12 @@ void StyleHelper::drawIconWithShadow(const QIcon &icon, const QRect &rect,
 
         // Draw the actual pixmap...
         cachePainter.drawPixmap(QRect(QPoint(radius, radius) + offset, QSize(px.width(), px.height())), px);
-#if QT_VERSION > 0x050000
         cache.setDevicePixelRatio(devicePixelRatio);
-#endif
         QPixmapCache::insert(pixmapName, cache);
     }
 
     QRect targetRect = cache.rect();
-    targetRect.setSize(targetRect.size() / pixmapDevicePixelRatio(cache));
+    targetRect.setSize(targetRect.size() / cache.devicePixelRatio());
     targetRect.moveCenter(rect.center() - dipOffset);
     p->drawPixmap(targetRect, cache);
 }

src/libs/utils/synchronousprocess.cpp

@@ -614,14 +614,7 @@ bool SynchronousProcess::readDataFromProcess(QProcess &p, int timeOutMS,
         }
         // Prompt user, pretend we have data if says 'No'.
         const bool hang = !hasData && !finished;
-        if (hang && showTimeOutMessageBox) {
-            QString binary;
-#if QT_VERSION >= 0x050000
-            binary = p.program();
-#endif
-            if (!askToKill(binary))
-                hasData = true;
-        }
+        hasData = hang && showTimeOutMessageBox && !askToKill(p.program());
     } while (hasData && !finished);
     if (syncDebug)
         qDebug() << "<readDataFromProcess" << finished;

src/libs/zeroconf/servicebrowser.cpp

@@ -1958,12 +1958,7 @@ ZConfLib::ConnectionRef MainConnection::mainRef()
 
 MainConnection::Status MainConnection::status()
 {
-#if QT_VERSION >= 0x050000
     return static_cast<MainConnection::Status>(m_status.load());
-#else
-    int val = m_status;
-    return static_cast<MainConnection::Status>(val);
-#endif
 }
 
 QList<ErrorMessage> MainConnection::errors()

src/plugins/android/androidmanifesteditorwidget.cpp

@@ -855,11 +855,7 @@ int extractVersion(const QString &string)
     int index = string.indexOf(QLatin1Char(':'));
     if (index == -1)
         return 0;
-#if QT_VERSION < 0x050100
-    return string.mid(4, index - 4).toInt();
-#else
     return string.midRef(4, index - 4).toInt();
-#endif
 }
 
 void AndroidManifestEditorWidget::syncToEditor()

src/plugins/beautifier/abstractsettings.cpp

@@ -65,11 +65,7 @@ QStringList AbstractSettings::completerWords()
 QStringList AbstractSettings::styles() const
 {
     QStringList list = m_styles.keys();
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
     list.sort(Qt::CaseInsensitive);
-#else //QT_VERSION_CHECK(5, 0, 0)
-    list.sort();
-#endif // QT_VERSION_CHECK(5, 0, 0)
     return list;
 }
 

src/plugins/beautifier/configurationeditor.cpp

@@ -123,11 +123,7 @@ void ConfigurationEditor::setSettings(AbstractSettings *settings)
     QStringList keywords = m_settings->options();
     m_highlighter->setKeywords(keywords);
     keywords << m_settings->completerWords();
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
     keywords.sort(Qt::CaseInsensitive);
-#else //QT_VERSION_CHECK(5, 0, 0)
-    keywords.sort();
-#endif //QT_VERSION_CHECK(5, 0, 0)
     m_model->setStringList(keywords);
 }
 

src/plugins/coreplugin/coreplugin.pro

 DEFINES += CORE_LIBRARY
-QT += network \
+QT += help \
+    network \
+    printsupport \
     script \
     sql
 
-greaterThan(QT_MAJOR_VERSION, 4) {
-    QT += help printsupport
-} else {
-    CONFIG += help
-}
-
 include(../../qtcreatorplugin.pri)
 include(../../shared/scriptwrapper/scriptwrapper.pri)
 win32-msvc*:QMAKE_CXXFLAGS += -wd4251 -wd4290 -wd4250
@@ -227,7 +223,7 @@ include(locator/locator.pri)
 
 win32 {
     SOURCES += progressmanager/progressmanager_win.cpp
-    greaterThan(QT_MAJOR_VERSION, 4): QT += gui-private # Uses QPlatformNativeInterface.
+    QT += gui-private # Uses QPlatformNativeInterface.
     LIBS += -lole32 -luser32
 }
 else:macx {

src/plugins/coreplugin/editormanager/openeditorsview.cpp

@@ -309,12 +309,10 @@ void ProxyModel::setSourceModel(QAbstractItemModel *sm)
     }
 }
 
-#if QT_VERSION >= 0x050000
 QModelIndex ProxyModel::sibling(int row, int column, const QModelIndex &idx) const
 {
     return QAbstractItemModel::sibling(row, column, idx);
 }
-#endif
 
 void ProxyModel::sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
 {

src/plugins/coreplugin/editormanager/openeditorsview.h

@@ -57,10 +57,8 @@ public:
 
     void setSourceModel(QAbstractItemModel *sourceModel);
 
-#if QT_VERSION >= 0x050000
     // QAbstractProxyModel::sibling is broken in Qt 5
     QModelIndex sibling(int row, int column, const QModelIndex &idx) const;
-#endif
 
 private slots:
     void sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);

src/plugins/coreplugin/editormanager/openeditorswindow.cpp

@@ -160,11 +160,7 @@ void OpenEditorsWindow::selectPreviousEditor()
 QSize OpenEditorsTreeWidget::sizeHint() const
 {
     return QSize(sizeHintForColumn(0) + verticalScrollBar()->width() + frameWidth() * 2,
-#if QT_VERSION < 0x050200
-                 minimumHeight());
-#else
                  viewportSizeHint().height() + frameWidth() * 2);
-#endif
 }
 
 QSize OpenEditorsWindow::sizeHint() const

src/plugins/coreplugin/fileutils.cpp

@@ -47,10 +47,6 @@
 #include <QPushButton>
 #include <QWidget>
 
-#if QT_VERSION < 0x050000
-#include <QAbstractFileEngine>
-#endif
-
 using namespace Utils;
 
 namespace Core {
@@ -187,11 +183,6 @@ void FileUtils::removeFile(const QString &filePath, bool deleteFromFS)
 static inline bool fileSystemRenameFile(const QString &orgFilePath,
                                         const QString &newFilePath)
 {
-#if QT_VERSION < 0x050000
-    QAbstractFileEngine *fileEngine = QAbstractFileEngine::create(orgFilePath); // Due to QTBUG-3570
-    if (!fileEngine->caseSensitive() && orgFilePath.compare(newFilePath, Qt::CaseInsensitive) == 0)
-        return fileEngine->rename(newFilePath);
-#endif
     // QTBUG-3570 is also valid for Qt 5 but QAbstractFileEngine is now in a private header file and
     // the symbol is not exported.
     return QFile::rename(orgFilePath, newFilePath);

src/plugins/coreplugin/find/searchresulttreeitemdelegate.cpp

@@ -65,11 +65,7 @@ void SearchResultTreeItemDelegate::paint(QPainter *painter, const QStyleOptionVi
     if (checkable) {
         QVariant checkStateData = index.data(Qt::CheckStateRole);
         checkState = static_cast<Qt::CheckState>(checkStateData.toInt());
-#if QT_VERSION >= 0x050000
         checkRect = doCheck(opt, opt.rect, checkStateData);
-#else // Qt4
-        checkRect = check(opt, opt.rect, checkStateData);
-#endif
     }
 
     // icon

src/plugins/coreplugin/progressmanager/progressmanager_win.cpp

@@ -27,18 +27,16 @@
 **
 ****************************************************************************/
 
+#include <QGuiApplication>
 #include <QVariant>
 #include <QMainWindow>
 #include <QFont>
 #include <QFontMetrics>
 #include <QPixmap>
 #include <QPainter>
-#if QT_VERSION >= 0x050000
-#    include <QGuiApplication>
-#    include <QWindow>
-#    include <qpa/qplatformnativeinterface.h>
-#endif
+#include <QWindow>
 #include <QLabel>
+#include <qpa/qplatformnativeinterface.h>
 
 #include <coreplugin/icore.h>
 #include <utils/stylehelper.h>
@@ -58,8 +56,6 @@ namespace {
     ITaskbarList3* pITask = 0;
 }
 
-#if QT_VERSION >= 0x050000
-
 QT_BEGIN_NAMESPACE
 Q_GUI_EXPORT HICON qt_pixmapToWinHICON(const QPixmap &p);
 QT_END_NAMESPACE
@@ -80,12 +76,6 @@ static inline HWND hwndOfWidget(const QWidget *w)
         result = QGuiApplication::platformNativeInterface()->nativeResourceForWindow("handle", window);
     return static_cast<HWND>(result);
 }
-#else
-static inline HWND hwndOfWidget(const QWidget *w)
-{
-    return w->winId();
-}
-#endif
 
 void Core::Internal::ProgressManagerPrivate::initInternal()
 {
@@ -131,11 +121,7 @@ void Core::Internal::ProgressManagerPrivate::doSetApplicationLabel(const QString
         font.setPixelSize(pix.height() * 0.5);
         p.setFont(font);
         p.drawText(pix.rect(), Qt::AlignCenter, text);
-#if QT_VERSION >= 0x050000
         const HICON icon = qt_pixmapToWinHICON(pix);
-#else
-        const HICON icon = pix.toWinHICON();
-#endif
         pITask->SetOverlayIcon(winId, icon, (wchar_t*)text.utf16());
         DestroyIcon(icon);
     }

src/plugins/debugger/debuggerplugin.cpp

@@ -2699,9 +2699,7 @@ QMessageBox *showMessageBox(int icon, const QString &title,
         title, text, QMessageBox::StandardButtons(buttons),
         ICore::mainWindow());
     mb->setAttribute(Qt::WA_DeleteOnClose);
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 1, 0))
     mb->setTextInteractionFlags(Qt::TextSelectableByMouse);
-#endif
     mb->show();
     return mb;
 }

src/plugins/debugger/debuggerprotocol.cpp

@@ -34,9 +34,7 @@
 #include <QDebug>
 #include <QHostAddress>
 #include <QRegExp>
-#if QT_VERSION >= 0x050200
 #include <QTimeZone>
-#endif