Turn cursor to cross-hair when stylus is near the screen

ui/presentationwidget.cpp

@@ -283,6 +283,9 @@ PresentationWidget::PresentationWidget( QWidget * parent, Okular::Document * doc
 
     // setFocus() so KCursor::setAutoHideCursor() goes into effect if it's enabled
     setFocus( Qt::OtherFocusReason );
+
+    // Catch TabletEnterProximity and TabletLeaveProximity events from the QApplication
+    qApp->installEventFilter( this );
 }
 
 PresentationWidget::~PresentationWidget()
@@ -312,6 +315,8 @@ PresentationWidget::~PresentationWidget()
 
     // delete frames
     qDeleteAll( m_frames );
+
+    qApp->removeEventFilter( this );
 }
 
 
@@ -531,6 +536,29 @@ void PresentationWidget::setPlayPauseIcon()
     }
 }
 
+bool PresentationWidget::eventFilter (QObject *o, QEvent *e )
+{
+    if ( o == qApp )
+    {
+        if ( e->type() == QTabletEvent::TabletEnterProximity )
+        {
+            setCursor( QCursor( Qt::CrossCursor ) );
+        }
+        if ( e->type() == QTabletEvent::TabletLeaveProximity )
+        {
+            if ( Okular::Settings::slidesCursor() == Okular::Settings::EnumSlidesCursor::Visible )
+            {
+                setCursor( QCursor( Qt::ArrowCursor ) );
+            }
+            else
+            {
+                setCursor( QCursor( Qt::BlankCursor ) );
+            }
+        }
+    }
+    return false;
+}
+
 // <widget events>
 bool PresentationWidget::event( QEvent * e )
 {

ui/presentationwidget.h

@@ -74,6 +74,9 @@ class PresentationWidget : public QWidget, public Okular::DocumentObserver
         void leaveEvent( QEvent * e ) override;
         bool gestureEvent (QGestureEvent * e );
 
+        // Catch TabletEnterProximity and TabletLeaveProximity events from the QApplication
+        bool eventFilter (QObject * o, QEvent * ev ) override;
+
     private:
         const void * getObjectRect( Okular::ObjectRect::ObjectType type, int x, int y, QRect * geometry = nullptr ) const;
         const Okular::Action * getLink( int x, int y, QRect * geometry = nullptr ) const;