[UI] - Dashboard chart load, min update time interval, not update vie…

…w so often when node is syncing.

     - Try chart refresh when the wallet is synced.

src/qt/pivx/dashboardwidget.cpp

@@ -11,6 +11,7 @@
 #include "walletmodel.h"
 #include "clientmodel.h"
 #include "optionsmodel.h"
+#include "utiltime.h"
 #include <QPainter>
 #include <QModelIndex>
 #include <QList>
@@ -20,6 +21,7 @@
 #define NUM_ITEMS 3
 #define SHOW_EMPTY_CHART_VIEW_THRESHOLD 4000
 #define REQUEST_LOAD_TASK 1
+#define CHART_LOAD_MIN_TIME_INTERVAL 15
 
 #include "moc_dashboardwidget.cpp"
 
@@ -231,9 +233,8 @@ void DashboardWidget::loadWalletModel(){
 void DashboardWidget::onTxArrived(const QString& hash) {
     showList();
 #ifdef USE_QTCHARTS
-    if (hasStakes() && walletModel->isCoinStakeMine(hash)) {
-        refreshChart();
-    }
+    if (walletModel->isCoinStakeMine(hash))
+        tryChartRefresh();
 #endif
 }
 
@@ -307,6 +308,9 @@ void DashboardWidget::walletSynced(bool sync){
     if (this->isSync != sync) {
         this->isSync = sync;
         ui->layoutWarning->setVisible(!this->isSync);
+#ifdef USE_QTCHARTS
+        tryChartRefresh();
+#endif
     }
 }
 
@@ -315,11 +319,21 @@ void DashboardWidget::changeTheme(bool isLightTheme, QString& theme){
 #ifdef USE_QTCHARTS
     if (chart) this->changeChartColors();
 #endif
-
 }
 
 #ifdef USE_QTCHARTS
 
+void DashboardWidget::tryChartRefresh() {
+    if (hasStakes()) {
+        // Check for min update time to not reload the UI so often if the node is syncing.
+        int64_t now = GetTime();
+        if (lastRefreshTime + CHART_LOAD_MIN_TIME_INTERVAL < now) {
+            lastRefreshTime = now;
+            refreshChart();
+        }
+    }
+}
+
 void DashboardWidget::setChartShow(ChartShowType type) {
     this->chartShow = type;
     if (chartShow == MONTH) {

src/qt/pivx/dashboardwidget.h

@@ -142,6 +142,8 @@ private slots:
 
 #ifdef USE_QTCHARTS
 
+    int64_t lastRefreshTime = 0;
+
     // Chart
     TransactionFilterProxy* stakesFilter = nullptr;
     bool isChartInitialized = false;
@@ -166,6 +168,7 @@ private slots:
     void initChart();
     void showHideEmptyChart(bool show, bool loading, bool forceView = false);
     bool refreshChart();
+    void tryChartRefresh();
     QMap<int, std::pair<qint64, qint64>> getAmountBy();
     ChartData loadChartData(bool withMonthNames);
     void updateAxisX(const QStringList *arg = nullptr);