Port away from deprecated Qt methods

lib/crop/cropwidget.cpp

@@ -33,6 +33,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #include <QtMath>
 #include <QLineEdit>
 #include <QFontDatabase>
+#include <QScreen>
 
 // KF
 #include <KLocalizedString>
@@ -199,10 +200,7 @@ struct CropWidgetPrivate : public QWidget
         mCurrentImageComboBoxIndex = ratioComboBox->count() - 1; // We need to refer to this ratio later
 
         addRatioToComboBox(QSizeF(1, 1), i18n("Square"));
-        addRatioToComboBox(ratio(QApplication::desktop()->screenGeometry().size()), i18n("This Screen"));
-        // The previous string should be changed to
-        // addRatioToComboBox(ratio(QGuiApplication::screenAt(QCursor::pos())->geometry().size()), i18n("This Screen"));
-        // after switching to Qt > 5.9
+        addRatioToComboBox(ratio(QGuiApplication::screenAt(QCursor::pos())->geometry().size()), i18n("This Screen"));
         addSectionHeaderToComboBox(i18n("Landscape"));
 
         for (const QSizeF& size : qAsConst(ratioList)) {

lib/documentview/videoviewadapter.cpp

@@ -28,7 +28,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA
 #include <QMouseEvent>
 #include <QElapsedTimer>
 #include <QIcon>
-#include <QTime>
+#include <QElapsedTimer>
 #include <QLabel>
 
 // Phonon
@@ -71,7 +71,7 @@ struct VideoViewAdapterPrivate
     QGraphicsProxyWidget* mProxy;
 
     HudSlider* mVolumeSlider;
-    QTime mLastVolumeSliderChangeTime;
+    QElapsedTimer mLastVolumeSliderChangeTime;
 
     Document::Ptr mDocument;
 

lib/fullscreenbar.cpp

@@ -29,6 +29,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #include <QEvent>
 #include <QMouseEvent>
 #include <QLayout>
+#include <QScreen>
 #include <QTimeLine>
 #include <QTimer>
 #include <QToolButton>
@@ -84,11 +85,7 @@ struct FullScreenBarPrivate
      */
     QRect slideInTriggerRect() const
     {
-        QRect rect = QApplication::desktop()->screenGeometry(QApplication::desktop()->screenNumber(q->parentWidget()));
-        // The previous string should be changed to
-        // QRect rect = QGuiApplication::screenAt(QCursor::pos())->geometry();
-        // after switching to Qt > 5.9
-
+        QRect rect = QGuiApplication::screenAt(QCursor::pos())->geometry();
         // Take parent widget position into account because it may not be at
         // the top of the screen, for example when the save bar warning is
         // shown.