Index: qtbase-opensource-src/src/widgets/itemviews/qabstractitemview.cpp
===================================================================
--- qtbase-opensource-src.orig/src/widgets/itemviews/qabstractitemview.cpp
+++ qtbase-opensource-src/src/widgets/itemviews/qabstractitemview.cpp
@@ -1668,6 +1668,11 @@ bool QAbstractItemView::event(QEvent *ev
     case QEvent::FontChange:
         d->doDelayedItemsLayout(); // the size of the items will change
         break;
+    case QEvent::Scroll:
+        if (static_cast<QScrollEvent *>(event)->scrollState() == QScrollEvent::ScrollFinished && QScroller::hasScroller(this))
+            if (QScroller::scroller(this)->state() == QScroller::State::Inactive)
+                QScroller::scroller(this)->deleteLater();
+        break;
     default:
         break;
     }
@@ -1753,6 +1758,21 @@ bool QAbstractItemView::viewportEvent(QE
 void QAbstractItemView::mousePressEvent(QMouseEvent *event)
 {
     Q_D(QAbstractItemView);
+
+    if (event->source() == Qt::MouseEventSynthesizedByQt) {
+        if (event->button() == Qt::LeftButton) {
+
+            if (QScroller::hasScroller(this)) {
+                QScroller::scroller(this)->deleteLater();
+            }
+            d->touchSlideTimer.start(QApplication::doubleClickInterval(), this);
+        }
+    } else {
+        if (QScroller::hasScroller(this)) {
+            QScroller::scroller(this)->deleteLater();
+        }
+    }
+
     d->delayedAutoScroll.stop(); //any interaction with the view cancel the auto scrolling
     QPoint pos = event->pos();
     QPersistentModelIndex index = indexAt(pos);
@@ -1819,6 +1839,35 @@ void QAbstractItemView::mousePressEvent(
 void QAbstractItemView::mouseMoveEvent(QMouseEvent *event)
 {
     Q_D(QAbstractItemView);
+
+    if (event->source() == Qt::MouseEventSynthesizedByQt) {
+        if (QScroller::hasScroller(this)) {
+            return;
+        }
+
+        if (d->touchSlideTimer.isActive()) {
+            QMargins margins= viewportMargins();
+            QPoint pos = event->pos();
+            pos = pos + QPoint(margins.left(),margins.top());
+            if ((d->pressedPosition - d->offset() - pos).manhattanLength() > 1.5 * QApplication::startDragDistance()) {
+                this->setVerticalScrollMode(ScrollPerPixel);
+                this->setHorizontalScrollMode(ScrollPerPixel);
+                QScroller::grabGesture(this, QScroller::LeftMouseButtonGesture);
+
+                QScroller *scroller = QScroller::scroller(this);
+                scroller->handleInput(QScroller::InputPress, pos, static_cast<qint64>(event->timestamp()));
+                scroller->handleInput(QScroller::InputMove, pos, static_cast<qint64>(event->timestamp()));
+
+            }
+            return;
+        }
+    } else {
+        if (QScroller::hasScroller(this)) {
+            QScroller::ungrabGesture(this);
+            QScroller::scroller(this)->deleteLater();
+        }
+    }
+
     QPoint topLeft;
     QPoint bottomRight = event->pos();
 
@@ -2541,6 +2590,8 @@ void QAbstractItemView::timerEvent(QTime
         doAutoScroll();
     else if (event->timerId() == d->updateTimer.timerId())
         d->updateDirtyRegion();
+    else if (event->timerId() == d->touchSlideTimer.timerId())
+        d->touchSlideTimer.stop();
     else if (event->timerId() == d->delayedEditing.timerId()) {
         d->delayedEditing.stop();
         edit(currentIndex());
@@ -4103,7 +4154,12 @@ QItemSelectionModel::SelectionFlags QAbs
         return QItemSelectionModel::Toggle|selectionBehaviorFlags();
     if (state == QAbstractItemView::DragSelectingState) {
         //when drag-selecting we need to clear any previous selection and select the current one
-        return QItemSelectionModel::Clear|QItemSelectionModel::SelectCurrent|selectionBehaviorFlags();
+
+        //fix multiple selection of QListView under touch screen and long press function conflict
+        if(event && event->type() == QEvent::MouseButtonPress)
+            return QItemSelectionModel::ClearAndSelect|selectionBehaviorFlags();
+        else
+            return QItemSelectionModel::Clear|QItemSelectionModel::SelectCurrent|selectionBehaviorFlags();
     }
 
     return QItemSelectionModel::ClearAndSelect|selectionBehaviorFlags();
Index: qtbase-opensource-src/src/widgets/itemviews/qabstractitemview_p.h
===================================================================
--- qtbase-opensource-src.orig/src/widgets/itemviews/qabstractitemview_p.h
+++ qtbase-opensource-src/src/widgets/itemviews/qabstractitemview_p.h
@@ -432,6 +432,7 @@ public:
     QBasicTimer delayedEditing;
     QBasicTimer delayedAutoScroll; //used when an item is clicked
     QBasicTimer delayedReset;
+    QBasicTimer touchSlideTimer;
 
     QAbstractItemView::ScrollMode verticalScrollMode;
     QAbstractItemView::ScrollMode horizontalScrollMode;