Drop Qt 5 support

Qt 6 has been available for almost 4 years. Qt 5 is no longer officially supported by Qt for opensource, it's time to drop Qt 5.

src/widgets/favoritewidget.cpp

@@ -63,21 +63,12 @@ void FavoriteWidget::paintEvent(QPaintEvent *e) {
 
   QStylePainter p(this);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
   if (favorite_) {
     p.drawPixmap(rect_, on_.pixmap(rect_.size(), devicePixelRatioF()));
   }
   else {
     p.drawPixmap(rect_, off_.pixmap(rect_.size(), devicePixelRatioF()));
   }
-#else
-  if (favorite_) {
-    p.drawPixmap(rect_, on_.pixmap(rect_.size()));
-  }
-  else {
-    p.drawPixmap(rect_, off_.pixmap(rect_.size()));
-  }
-#endif
 
 }
 

src/widgets/fileview.cpp

@@ -245,12 +245,7 @@ void FileView::Delete(const QStringList &filenames) {
 
   if (DeleteConfirmationDialog::warning(filenames) != QDialogButtonBox::Yes) return;
 
-  bool use_trash = false;
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
-  use_trash = true;
-#endif
-
-  DeleteFiles *delete_files = new DeleteFiles(task_manager_, storage_, use_trash);
+  DeleteFiles *delete_files = new DeleteFiles(task_manager_, storage_, true);
   QObject::connect(delete_files, &DeleteFiles::Finished, this, &FileView::DeleteFinished);
   delete_files->Start(filenames);
 

src/widgets/groupediconview.cpp

@@ -242,11 +242,7 @@ void GroupedIconView::paintEvent(QPaintEvent *e) {
   // This code was adapted from QListView::paintEvent(), changed to use the visualRect() of items, and to draw headers.
 
   QStyleOptionViewItem option;
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
   initViewItemOption(&option);
-#else
-  option = viewOptions();
-#endif
   if (isWrapping()) {
     option.features = QStyleOptionViewItem::WrapText;
   }

src/widgets/tracksliderslider.cpp

@@ -71,11 +71,7 @@ void TrackSliderSlider::mousePressEvent(QMouseEvent *e) {
     }
   }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
   QMouseEvent new_event(e->type(), e->pos(), e->globalPosition(), new_button, new_button, e->modifiers());
-#else
-  QMouseEvent new_event(e->type(), e->pos(), e->globalPos(), new_button, new_button, e->modifiers());
-#endif
   QSlider::mousePressEvent(&new_event);
 
   if (new_event.isAccepted()) {
@@ -137,11 +133,7 @@ void TrackSliderSlider::wheelEvent(QWheelEvent *e) {
 
 }
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 void TrackSliderSlider::enterEvent(QEnterEvent *e) {
-#else
-void TrackSliderSlider::enterEvent(QEvent *e) {
-#endif
 
   QSlider::enterEvent(e);
 #ifndef Q_OS_MACOS

src/widgets/tracksliderslider.h

@@ -54,11 +54,7 @@ class TrackSliderSlider : public QSlider {
   void mouseReleaseEvent(QMouseEvent *e) override;
   void mouseMoveEvent(QMouseEvent *e) override;
   void wheelEvent(QWheelEvent *e) override;
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
   void enterEvent(QEnterEvent *e) override;
-#else
-  void enterEvent(QEvent *e) override;
-#endif
   void leaveEvent(QEvent *e) override;
   void keyPressEvent(QKeyEvent *event) override;
 

src/widgets/volumeslider.cpp

@@ -40,11 +40,7 @@
 #include <QAction>
 #include <QLinearGradient>
 #include <QStyleOptionViewItem>
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-#  include <QEnterEvent>
-#else
-#  include <QEvent>
-#endif
+#include <QEnterEvent>
 #include <QPaintEvent>
 #include <QContextMenuEvent>
 #include <QMouseEvent>
@@ -233,11 +229,7 @@ void VolumeSlider::drawVolumeSliderHandle() {
 
 }
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 void VolumeSlider::enterEvent(QEnterEvent*) {
-#else
-void VolumeSlider::enterEvent(QEvent*) {
-#endif
 
   anim_enter_ = true;
   anim_count_ = 0;

src/widgets/volumeslider.h

@@ -32,15 +32,12 @@
 #include "sliderslider.h"
 
 class QTimer;
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 class QEnterEvent;
-#else
-class QEvent;
-#endif
 class QPaintEvent;
 class QMouseEvent;
 class QWheelEvent;
 class QContextMenuEvent;
+class QEvent;
 
 class VolumeSlider : public SliderSlider {
   Q_OBJECT
@@ -51,11 +48,7 @@ class VolumeSlider : public SliderSlider {
   void HandleWheel(const int delta);
 
  protected:
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
   void enterEvent(QEnterEvent*) override;
-#else
-  void enterEvent(QEvent*) override;
-#endif
   void leaveEvent(QEvent*) override;
   void paintEvent(QPaintEvent*) override;
   virtual void paletteChange(const QPalette&);