From 037391ec4f1e2707e1c2f2c474219a034ed9cb15 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sun, 13 Jan 2019 23:29:20 +0100
Subject: [PATCH] fixes 0003222: Invert zoom setting is not respected in
 paper/page mode

---
 src/Mod/Drawing/Gui/DrawingView.cpp | 11 ++++++++++-
 src/Mod/Drawing/Gui/DrawingView.h   |  4 ++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Drawing/Gui/DrawingView.cpp b/src/Mod/Drawing/Gui/DrawingView.cpp
index bbfb054656..6060e45787 100644
--- a/src/Mod/Drawing/Gui/DrawingView.cpp
+++ b/src/Mod/Drawing/Gui/DrawingView.cpp
@@ -71,6 +71,7 @@ SvgView::SvgView(QWidget *parent)
     , m_svgItem(0)
     , m_backgroundItem(0)
     , m_outlineItem(0)
+    , m_invertZoom(false)
 {
     setScene(new QGraphicsScene(this));
     setTransformationAnchor(AnchorUnderMouse);
@@ -196,7 +197,10 @@ void SvgView::paintEvent(QPaintEvent *event)
 
 void SvgView::wheelEvent(QWheelEvent *event)
 {
-    qreal factor = std::pow(1.2, -event->delta() / 240.0);
+    int delta = -event->delta();
+    if (m_invertZoom)
+        delta = -delta;
+    qreal factor = std::pow(1.2, delta / 240.0);
     scale(factor, factor);
     event->accept();
 }
@@ -253,6 +257,11 @@ DrawingView::DrawingView(Gui::Document* doc, QWidget* parent)
 
     m_orientation = QPrinter::Landscape;
     m_pageSize = QPrinter::A4;
+
+    ParameterGrp::handle hGrp = App::GetApplication().GetParameterGroupByPath
+            ("User parameter:BaseApp/Preferences/View");
+    bool on = hGrp->GetBool("InvertZoom", false);
+    m_view->setZoomInverted(on);
 }
 
 DrawingView::~DrawingView()
diff --git a/src/Mod/Drawing/Gui/DrawingView.h b/src/Mod/Drawing/Gui/DrawingView.h
index cebd0d5c3d..d0b1873c16 100644
--- a/src/Mod/Drawing/Gui/DrawingView.h
+++ b/src/Mod/Drawing/Gui/DrawingView.h
@@ -55,6 +55,9 @@ public:
     void openFile(const QFile &file);
     void setRenderer(RendererType type = Native);
     void drawBackground(QPainter *p, const QRectF &rect);
+    void setZoomInverted(bool on) {
+        m_invertZoom = on;
+    }
 
 public Q_SLOTS:
     void setHighQualityAntialiasing(bool highQualityAntialiasing);
@@ -73,6 +76,7 @@ private:
     QGraphicsRectItem *m_outlineItem;
 
     QImage m_image;
+    bool m_invertZoom;
 };
 
 class DrawingGuiExport DrawingView : public Gui::MDIView