From 1fac8a7bbac28ea871f0a95dfe0b7d6ddcb2512a Mon Sep 17 00:00:00 2001
From: David Edmundson <kde@davidedmundson.co.uk>
Date: Thu, 5 Mar 2015 15:12:52 +0100
Subject: [PATCH] Create drag pixmaps which match the device pixel ratio

---
 src/kitemviews/kfileitemlistview.cpp   | 8 ++++++--
 src/kitemviews/kitemlistcontroller.cpp | 2 +-
 src/kitemviews/kitemlistwidget.cpp     | 2 ++
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/kitemviews/kfileitemlistview.cpp b/src/kitemviews/kfileitemlistview.cpp
index d249bef91..18b193572 100644
--- a/src/kitemviews/kfileitemlistview.cpp
+++ b/src/kitemviews/kfileitemlistview.cpp
@@ -29,6 +29,8 @@
 
 #include <QPainter>
 #include <QTimer>
+#include <QGraphicsScene>
+#include <QGraphicsView>
 
 // #define KFILEITEMLISTVIEW_DEBUG
 
@@ -154,8 +156,10 @@ QPixmap KFileItemListView::createDragPixmap(const KItemSet& indexes) const
         yCount = xCount;
     }
 
+    qreal dpr = scene()->views()[0]->devicePixelRatio();
     // Draw the selected items into the grid cells.
-    QPixmap dragPixmap(xCount * size + xCount, yCount * size + yCount);
+    QPixmap dragPixmap(QSize(xCount * size + xCount, yCount * size + yCount)*dpr);
+    dragPixmap.setDevicePixelRatio(dpr);
     dragPixmap.fill(Qt::transparent);
 
     QPainter painter(&dragPixmap);
@@ -168,7 +172,7 @@ QPixmap KFileItemListView::createDragPixmap(const KItemSet& indexes) const
             QIcon icon = QIcon::fromTheme(model()->data(index).value("iconName").toString());
             pixmap = icon.pixmap(size, size);
         } else {
-            KPixmapModifier::scale(pixmap, QSize(size, size));
+            KPixmapModifier::scale(pixmap, QSize(size, size) * dpr);
         }
 
         painter.drawPixmap(x, y, pixmap);
diff --git a/src/kitemviews/kitemlistcontroller.cpp b/src/kitemviews/kitemlistcontroller.cpp
index a9ebf97af..1c86ff03f 100644
--- a/src/kitemviews/kitemlistcontroller.cpp
+++ b/src/kitemviews/kitemlistcontroller.cpp
@@ -1168,7 +1168,7 @@ void KItemListController::startDragging()
     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
     drag->setPixmap(pixmap);
 
-    const QPoint hotSpot(pixmap.width() / 2, 0);
+    const QPoint hotSpot((pixmap.width() / pixmap.devicePixelRatio()) / 2, 0);
     drag->setHotSpot(hotSpot);
 
     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
diff --git a/src/kitemviews/kitemlistwidget.cpp b/src/kitemviews/kitemlistwidget.cpp
index 3eb6b1d71..596d1d709 100644
--- a/src/kitemviews/kitemlistwidget.cpp
+++ b/src/kitemviews/kitemlistwidget.cpp
@@ -369,6 +369,8 @@ QPixmap KItemListWidget::createDragPixmap(const QStyleOptionGraphicsItem* option
                                           QWidget* widget)
 {
     QPixmap pixmap(size().toSize());
+    QPixmap pixmap(size().toSize() * widget->devicePixelRatio());
+    pixmap.setDevicePixelRatio(widget->devicePixelRatio());
     pixmap.fill(Qt::transparent);
 
     QPainter painter(&pixmap);
-- 
2.47.3