qt:refactor: Use std::chrono in TrafficGraphWidget class

Author: shaavan

src/qt/rpcconsole.cpp

@@ -54,6 +54,8 @@
 #include <QTimer>
 #include <QVariant>
 
+#include <chrono>
+
 const int CONSOLE_HISTORY = 50;
 const int INITIAL_TRAFFIC_GRAPH_MINS = 30;
 const QSize FONT_RANGE(4, 40);
@@ -1140,7 +1142,7 @@ void RPCConsole::on_sldGraphRange_valueChanged(int value)
 
 void RPCConsole::setTrafficGraphRange(int mins)
 {
-    ui->trafficGraph->setGraphRangeMins(mins);
+    ui->trafficGraph->setGraphRange(std::chrono::minutes{mins});
     ui->lblGraphRange->setText(GUIUtil::formatDurationStr(std::chrono::minutes{mins}));
 }
 

src/qt/trafficgraphwidget.cpp

@@ -11,6 +11,7 @@
 #include <QColor>
 #include <QTimer>
 
+#include <chrono>
 #include <cmath>
 #include <cfloat>
 
@@ -145,22 +146,25 @@ void TrafficGraphWidget::updateRates()
     }
 
     float tmax = 0.0f;
-    for (const float f : vSamplesIn.mid(0,(DESIRED_SAMPLES*(getGraphRangeMins()/5)))) {
+    for (const float f : vSamplesIn.mid(0,(DESIRED_SAMPLES*getGraphRangeMins()/5))) {
         if(f > tmax) tmax = f;
     }
-    for (const float f : vSamplesOut.mid(0,(DESIRED_SAMPLES*(getGraphRangeMins()/5)))) {
+    for (const float f : vSamplesOut.mid(0,(DESIRED_SAMPLES*getGraphRangeMins()/5))) {
         if(f > tmax) tmax = f;
     }
     fMax = tmax;
     update();
 }
 
-void TrafficGraphWidget::setGraphRangeMins(int mins)
+void TrafficGraphWidget::setGraphRange(std::chrono::minutes new_range)
 {
-    nMins = mins;
-    int msecsPerSample = nMins * 60 * 1000 / (DESIRED_SAMPLES * (getGraphRangeMins() / 5));
+    using namespace std::chrono_literals;
+    const auto range{new_range};
+    nMins = new_range.count();
+    auto msecs_per_sample = nMins * 60 * 1000 / (DESIRED_SAMPLES * (range.count() / 5));
     timer->stop();
-    timer->setInterval(msecsPerSample);
+    timer->setInterval(msecs_per_sample);
+
     update();
     timer->start();
 }

src/qt/trafficgraphwidget.h

@@ -8,6 +8,8 @@
 #include <QWidget>
 #include <QQueue>
 
+#include <chrono>
+
 class ClientModel;
 
 QT_BEGIN_NAMESPACE
@@ -29,15 +31,15 @@ class TrafficGraphWidget : public QWidget
 
 public Q_SLOTS:
     void updateRates();
-    void setGraphRangeMins(int mins);
+    void setGraphRange(std::chrono::minutes new_range);
     void clear();
 
 private:
     void paintPath(QPainterPath &path, QQueue<float> &samples);
 
     QTimer *timer;
     float fMax;
-    int nMins;
+    long nMins;
     QQueue<float> vSamplesIn;
     QQueue<float> vSamplesOut;
     quint64 nLastBytesIn;