Refs #5665 - Remove Y-Axis values when autoscale is selected.

Remove (and store) the contents of the Y-Axis fields when the autoscale
checkbox is checked, replacing them with "N\A".  Also, disable the minimum
field when "Start at First Good Data" is chosen.

These two changes now ensure a bigger visual difference between the concept
of "disable and do not use", and "disable but still use", and clears the way
for adding a "Custom Value" option to the dropdown box.

Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/MuonAnalysisOptionTab.h

@@ -61,7 +61,7 @@ class MuonAnalysisOptionTab : public QWidget
  Q_OBJECT
 public:
   /// Constructor
-  MuonAnalysisOptionTab(Ui::MuonAnalysis& uiForm, const QString& group) : m_uiForm(uiForm), m_settingsGroup(group) {}
+  MuonAnalysisOptionTab(Ui::MuonAnalysis& uiForm, const QString& group) : m_uiForm(uiForm), m_settingsGroup(group), m_yAxisMinimum(), m_yAxisMaximum() {}
 
   /// Initialise the layout of Muon Analysis.
   void initLayout();
@@ -72,6 +72,12 @@ class MuonAnalysisOptionTab : public QWidget
   /// When data loaded set various buttons etc to active
   void nowDataAvailable();
 
+  /// Set the *stored" yAxisMinimum value.
+  void setStoredYAxisMinimum(QString yAxisMinimum);
+
+  /// Set the *stored" yAxisMaximum value.
+  void setStoredYAxisMaximum(QString yAxisMaximum);
+
 
 public slots:
   /// Set the run time in muon analysis and save into settings.
@@ -99,6 +105,11 @@ public slots:
   /// group defaults are saved to
   const QString& m_settingsGroup;
 
+  /// Store value when autoscale has been selected, for when it is deselected again.
+  QString m_yAxisMinimum;
+
+  /// Store value when autoscale has been selected, for when it is deselected again.
+  QString m_yAxisMaximum;
 
 private slots:  
   /// Save the settings for time axis start and validate the entry.

Code/Mantid/MantidQt/CustomInterfaces/src/MuonAnalysis.cpp

@@ -2982,13 +2982,27 @@ void MuonAnalysis::loadAutoSavedValues(const QString& group)
   QStringList kusse = prevPlotStyle.childKeys();
   if ( kusse.contains("yAxisStart") )
   {
-    double yAxisStart = prevPlotStyle.value("yAxisStart").toDouble();
-    m_uiForm.yAxisMinimumInput->setText(QString::number(yAxisStart));
+    if( ! m_uiForm.yAxisAutoscale->isChecked() )
+    {
+      double yAxisStart = prevPlotStyle.value("yAxisStart").toDouble();
+      m_uiForm.yAxisMinimumInput->setText(QString::number(yAxisStart));
+    }
+    else
+    {
+      m_optionTab->setStoredYAxisMinimum(prevPlotStyle.value("yAxisStart").toString());
+    }
   }
   if ( kusse.contains("yAxisFinish") )
   {
-    double yAxisFinish = prevPlotStyle.value("yAxisFinish").toDouble();
-    m_uiForm.yAxisMaximumInput->setText(QString::number(yAxisFinish));
+    if( ! m_uiForm.yAxisAutoscale->isChecked() )
+    {
+      double yAxisFinish = prevPlotStyle.value("yAxisFinish").toDouble();
+      m_uiForm.yAxisMaximumInput->setText(QString::number(yAxisFinish));
+    }
+    else
+    {
+      m_optionTab->setStoredYAxisMaximum(prevPlotStyle.value("yAxisFinish").toString());
+    }
   }
 
   // Load Plot Binning Options

Code/Mantid/MantidQt/CustomInterfaces/src/MuonAnalysisOptionTab.cpp

@@ -176,6 +176,20 @@ void MuonAnalysisOptionTab::runyAxisAutoscale(bool state)
   m_uiForm.yAxisMinimumInput->setEnabled(!state);
   m_uiForm.yAxisMaximumInput->setEnabled(!state);
 
+  if(state)
+  {
+    m_yAxisMinimum = m_uiForm.yAxisMinimumInput->text();
+    m_yAxisMaximum = m_uiForm.yAxisMaximumInput->text();
+
+    m_uiForm.yAxisMinimumInput->setText("N/A");
+    m_uiForm.yAxisMaximumInput->setText("N/A");
+  }
+  else
+  {
+    m_uiForm.yAxisMinimumInput->setText(m_yAxisMinimum);
+    m_uiForm.yAxisMaximumInput->setText(m_yAxisMaximum);
+  }
+
   QSettings group;
   group.beginGroup(m_settingsGroup + "plotStyleOptions");
   group.setValue("axisAutoScaleOnOff", state);   
@@ -194,7 +208,7 @@ void MuonAnalysisOptionTab::runTimeComboBox(int index)
 
   if ( index == 0 ) // Start at First Good Data
   {
-    m_uiForm.timeAxisStartAtInput->setEnabled(true);
+    m_uiForm.timeAxisStartAtInput->setEnabled(false);
     m_uiForm.timeAxisStartAtInput->setText(m_uiForm.firstGoodBinFront->text());
   }
 
@@ -426,6 +440,18 @@ void MuonAnalysisOptionTab::openDirectoryDialog()
   ad->setFocus();
 }
 
+/// Set the *stored" yAxisMinimum value.
+void MuonAnalysisOptionTab::setStoredYAxisMinimum(QString yAxisMinimum)
+{
+  m_yAxisMinimum = yAxisMinimum;
+}
+
+/// Set the *stored" yAxisMaximum value.
+void MuonAnalysisOptionTab::setStoredYAxisMaximum(QString yAxisMaximum)
+{
+  m_yAxisMaximum = yAxisMaximum;
+}
+
 }
 }
 }