Add a scroll bar for TraceAnalyzer

A scroll bar was added to the TraceAnalyzer to prepare for the upcoming
changes of collapsing/folding ranks to increase readability when many
ranks are displayed. The scroll bar is hidden up to a number of 25 rows
in the TracePlot.

DRAMSys/traceAnalyzer/presentation/traceplot.cpp

@@ -172,11 +172,13 @@ void TracePlot::setUpContextMenu()
     contextMenu->addActions({showQueryEditor, insertComment, exportToPdf});
 }
 
-void TracePlot::init(TraceNavigator *navigator)
+void TracePlot::init(TraceNavigator *navigator, QScrollBar *scrollBar)
 {
     Q_ASSERT(isInitialized == false);
     isInitialized = true;
 
+    this->scrollBar = scrollBar;
+
     this->navigator = navigator;
     connectNavigatorQ_SIGNALS();
     setUpDrawingProperties();
@@ -254,13 +256,34 @@ void TracePlot::setUpZoom()
     zoomZone->setVisible(false);
 }
 
+void TracePlot::verticalScrollbarChanged(int value)
+{
+    int numberOfBanks = drawingProperties.numberOfBanks;
+
+    // The maximum number of displayed rows determined by the pageStep of the scroll bar.
+    const int maxDisplayedRows = scrollBar->pageStep();
+
+    if (numberOfBanks + 5 + 2 <= maxDisplayedRows)
+    {
+        setAxisScale(yLeft, -5, numberOfBanks + 2, 1.0);
+    }
+    else
+    {
+        setAxisScale(yLeft, numberOfBanks - maxDisplayedRows + 2 - value, numberOfBanks + 2 - value, 1.0);
+    }
+
+    replot();
+}
+
 void TracePlot::setUpAxis()
 {
-    int numberOfBanks = navigator->GeneralTraceInfo().numberOfBanks;
+    // Set up y axis.
+    verticalScrollbarChanged(scrollBar->value());
 
-    setAxisScale(yLeft, -5, numberOfBanks + 2, 1.0);
-    setAxisScaleDraw(yLeft, new CustomLabelScaleDraw(
-                         drawingProperties.getLabels()));
+    CustomLabelScaleDraw *customLabelScaleDraw = new CustomLabelScaleDraw(drawingProperties.getLabels());
+    customLabelScaleDraw->setMinimumExtent(135.0);
+
+    setAxisScaleDraw(yLeft, customLabelScaleDraw);
 
     setAxisTitle(xBottom, "Time in ns");
     setAxisScaleDraw(xBottom, new EngineeringScaleDraw);

DRAMSys/traceAnalyzer/presentation/traceplot.h

@@ -44,6 +44,7 @@
 #include <vector>
 #include <qwt_plot_marker.h>
 #include <QAction>
+#include <QScrollBar>
 #include <qwt_plot_zoneitem.h>
 #include "traceplotitem.h"
 #include "tracenavigator.h"
@@ -66,7 +67,7 @@ class TracePlot : public QwtPlot
 
 public:
     TracePlot(QWidget *parent = NULL);
-    void init(TraceNavigator *navigator);
+    void init(TraceNavigator *navigator, QScrollBar *scrollBar);
     Timespan GetCurrentTimespan();
     traceTime ZoomLevel() const
     {
@@ -80,6 +81,7 @@ public Q_SLOTS:
     void currentTraceTimeChanged();
     void selectedTransactionsChanged();
     void commentsChanged();
+    void verticalScrollbarChanged(int value);
 
 
 Q_SIGNALS:
@@ -113,6 +115,7 @@ private:
     std::vector<std::shared_ptr<Transaction>> transactions;
     QueryEditor *queryEditor;
     QMenu *contextMenu;
+    QScrollBar *scrollBar;
 
     void setUpTracePlotItem();
     void setUpDrawingProperties();

DRAMSys/traceAnalyzer/tracefiletab.cpp

@@ -66,8 +66,11 @@ TraceFileTab::TraceFileTab(QWidget *parent, const QString &path) :
 
     initNavigatorAndItsDependentWidgets(path);
     setUpFileWatcher(path);
+    setUpTraceplotScrollbar();
+
     ui->fileDescriptionEdit->setPlainText(
         navigator->GeneralTraceInfo().description);
+
     tracefileChanged();
 }
 
@@ -82,11 +85,24 @@ void TraceFileTab::commitChangesToDB()
     navigator->commitChangesToDB();
 }
 
+void TraceFileTab::setUpTraceplotScrollbar()
+{
+    unsigned int numberOfBanks = navigator->GeneralTraceInfo().numberOfBanks;
+    unsigned int pageStep = ui->traceplotScrollbar->pageStep();
+    ui->traceplotScrollbar->setMaximum(numberOfBanks + 7 - pageStep);
+
+    if (ui->traceplotScrollbar->maximum() <= 0)
+        ui->traceplotScrollbar->hide();
+
+    QObject::connect(ui->traceplotScrollbar, SIGNAL(valueChanged(int)),
+                     ui->traceplot, SLOT(verticalScrollbarChanged(int)));
+}
+
 void TraceFileTab::initNavigatorAndItsDependentWidgets(QString path)
 {
     navigator = new TraceNavigator(path, this);
 
-    ui->traceplot->init(navigator);
+    ui->traceplot->init(navigator, ui->traceplotScrollbar);
 
     ui->traceScroller->init(navigator, ui->traceplot);
     connect(this, SIGNAL(colorGroupingChanged(ColorGrouping)),

DRAMSys/traceAnalyzer/tracefiletab.h

@@ -58,6 +58,7 @@ public:
     ~TraceFileTab();
 
     void setUpFileWatcher(QString filename);
+    void setUpTraceplotScrollbar();
     void initNavigatorAndItsDependentWidgets(QString path);
     QString getPathToTraceFile()
     {

DRAMSys/traceAnalyzer/tracefiletab.ui

@@ -41,27 +41,58 @@
       <property name="orientation">
        <enum>Qt::Vertical</enum>
       </property>
-      <widget class="TracePlot" name="traceplot">
+      <widget class="QWidget" name="traceplotContainer" native="true">
        <property name="sizePolicy">
-        <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
-         <horstretch>3</horstretch>
-         <verstretch>4</verstretch>
+        <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
+         <horstretch>0</horstretch>
+         <verstretch>250</verstretch>
         </sizepolicy>
        </property>
-       <property name="minimumSize">
-        <size>
-         <width>0</width>
-         <height>0</height>
-        </size>
-       </property>
-       <property name="focusPolicy">
-        <enum>Qt::StrongFocus</enum>
-       </property>
+       <layout class="QHBoxLayout" name="horizontalLayout_3">
+        <item>
+         <widget class="TracePlot" name="traceplot">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+            <horstretch>0</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="minimumSize">
+           <size>
+            <width>0</width>
+            <height>0</height>
+           </size>
+          </property>
+          <property name="focusPolicy">
+           <enum>Qt::StrongFocus</enum>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QScrollBar" name="traceplotScrollbar">
+          <property name="enabled">
+           <bool>true</bool>
+          </property>
+          <property name="pageStep">
+           <number>25</number>
+          </property>
+          <property name="orientation">
+           <enum>Qt::Vertical</enum>
+          </property>
+          <property name="invertedAppearance">
+           <bool>false</bool>
+          </property>
+          <property name="invertedControls">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+       </layout>
       </widget>
       <widget class="TraceScroller" name="traceScroller">
        <property name="sizePolicy">
-        <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
-         <horstretch>4</horstretch>
+        <sizepolicy hsizetype="Expanding" vsizetype="Minimum">
+         <horstretch>0</horstretch>
          <verstretch>1</verstretch>
         </sizepolicy>
        </property>