From 9d217367e9f29e439bed4eb94d772cb2a4b09495 Mon Sep 17 00:00:00 2001
From: jriegel <FreeCAD@juergen-riegel.net>
Date: Mon, 16 Dec 2013 00:02:31 +0100
Subject: [PATCH] Mouse wheel handling in InputField

---
 src/Gui/InputField.cpp | 24 +++++++++++++++++++++++-
 src/Gui/InputField.h   |  3 +++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/Gui/InputField.cpp b/src/Gui/InputField.cpp
index b577a15a3..65b02e410 100644
--- a/src/Gui/InputField.cpp
+++ b/src/Gui/InputField.cpp
@@ -124,6 +124,10 @@ void InputField::newInput(const QString & text)
     ErrorText = "";
     this->setToolTip(QString::fromAscii(ErrorText.c_str()));
     actQuantity = res;
+    double dFactor;
+    res.getUserString(dFactor,actUnitStr);
+    // calculate the number shown 
+    actUnitValue = res.getValue()/dFactor; 
     // signaling 
     valueChanged(res);
 
@@ -235,7 +239,9 @@ void InputField::setValue(const Base::Quantity& quant)
     if(!quant.getUnit().isEmpty())
         actUnit = quant.getUnit();
 
-    setText(quant.getUserString());
+    double dFactor;
+    setText(quant.getUserString(dFactor,actUnitStr));
+    actUnitValue = quant.getValue()/dFactor;
 }
 
 void InputField::setUnit(const Base::Unit& unit)
@@ -307,6 +313,22 @@ void InputField::selectNumber(void)
 
 }
 
+void InputField::wheelEvent ( QWheelEvent * event )
+{
+     int numDegrees = event->delta() / 8;
+     int numSteps = numDegrees / 15;
+
+     double val = actUnitValue + numSteps;
+
+     this->setText( QString::fromUtf8("%1 %2").arg(val).arg(actUnitStr));
+
+     //if (event->orientation() == Qt::Horizontal) {
+     //    scrollHorizontally(numSteps);
+     //} else {
+     //    scrollVertically(numSteps);
+     //}
+     event->accept();
+}
 // --------------------------------------------------------------------
 
 
diff --git a/src/Gui/InputField.h b/src/Gui/InputField.h
index 5ede1388e..5af5ff5ac 100644
--- a/src/Gui/InputField.h
+++ b/src/Gui/InputField.h
@@ -129,6 +129,7 @@ Q_SIGNALS:
 protected Q_SLOTS:
     void newInput(const QString & text);
 
+    void wheelEvent ( QWheelEvent * event ) ;
 protected:
     virtual void 	contextMenuEvent ( QContextMenuEvent * event );
 
@@ -142,6 +143,8 @@ private:
 
   Base::Quantity actQuantity;
   Base::Unit     actUnit;
+  double         actUnitValue;
+  QString        actUnitStr;
 
   double Maximum;
   double Minimum;