[Qt] rework setNumBlocks to have blockDate as parameter

- reduces some functional overhead and simplifies the code

src/qt/bitcoingui.cpp

@@ -436,8 +436,8 @@ void BitcoinGUI::setClientModel(ClientModel *clientModel)
         setNumConnections(clientModel->getNumConnections());
         connect(clientModel, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
 
-        setNumBlocks(clientModel->getNumBlocks());
-        connect(clientModel, SIGNAL(numBlocksChanged(int)), this, SLOT(setNumBlocks(int)));
+        setNumBlocks(clientModel->getNumBlocks(), clientModel->getLastBlockDate());
+        connect(clientModel, SIGNAL(numBlocksChanged(int,QDateTime)), this, SLOT(setNumBlocks(int,QDateTime)));
 
         // Receive and report messages from client model
         connect(clientModel, SIGNAL(message(QString,QString,unsigned int)), this, SLOT(message(QString,QString,unsigned int)));
@@ -653,7 +653,7 @@ void BitcoinGUI::setNumConnections(int count)
     labelConnectionsIcon->setToolTip(tr("%n active connection(s) to Bitcoin network", "", count));
 }
 
-void BitcoinGUI::setNumBlocks(int count)
+void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate)
 {
     if(!clientModel)
         return;
@@ -681,9 +681,8 @@ void BitcoinGUI::setNumBlocks(int count)
 
     QString tooltip;
 
-    QDateTime lastBlockDate = clientModel->getLastBlockDate();
     QDateTime currentDate = QDateTime::currentDateTime();
-    qint64 secs = lastBlockDate.secsTo(currentDate);
+    qint64 secs = blockDate.secsTo(currentDate);
 
     tooltip = tr("Processed %n blocks of transaction history.", "", count);
 

src/qt/bitcoingui.h

@@ -143,8 +143,8 @@ signals:
 public slots:
     /** Set number of connections shown in the UI */
     void setNumConnections(int count);
-    /** Set number of blocks shown in the UI */
-    void setNumBlocks(int count);
+    /** Set number of blocks and last block date shown in the UI */
+    void setNumBlocks(int count, const QDateTime& blockDate);
 
     /** Notify the user of an event from the core network or transaction handling code.
        @param[in] title     the message box / notification title

src/qt/clientmodel.cpp

@@ -18,7 +18,6 @@
 
 #include <stdint.h>
 
-#include <QDateTime>
 #include <QDebug>
 #include <QTimer>
 
@@ -29,6 +28,7 @@ ClientModel::ClientModel(OptionsModel *optionsModel, QObject *parent) :
     optionsModel(optionsModel),
     peerTableModel(0),
     cachedNumBlocks(0),
+    cachedBlockDate(QDateTime()),
     cachedReindexing(0),
     cachedImporting(0),
     pollTimer(0)
@@ -79,9 +79,10 @@ quint64 ClientModel::getTotalBytesSent() const
 QDateTime ClientModel::getLastBlockDate() const
 {
     LOCK(cs_main);
+
     if (chainActive.Tip())
         return QDateTime::fromTime_t(chainActive.Tip()->GetBlockTime());
-    else
+
     return QDateTime::fromTime_t(Params().GenesisBlock().GetBlockTime()); // Genesis block's time of current network
 }
 
@@ -97,21 +98,26 @@ void ClientModel::updateTimer()
     // periodical polls if the core is holding the locks for a longer time -
     // for example, during a wallet rescan.
     TRY_LOCK(cs_main, lockMain);
-    if(!lockMain)
+    if (!lockMain)
         return;
+
     // Some quantities (such as number of blocks) change so fast that we don't want to be notified for each change.
     // Periodically check and update with a timer.
     int newNumBlocks = getNumBlocks();
+    QDateTime newBlockDate = getLastBlockDate();
 
     // check for changed number of blocks we have, number of blocks peers claim to have, reindexing state and importing state
     if (cachedNumBlocks != newNumBlocks ||
-        cachedReindexing != fReindex || cachedImporting != fImporting)
+        cachedBlockDate != newBlockDate ||
+        cachedReindexing != fReindex ||
+        cachedImporting != fImporting)
     {
         cachedNumBlocks = newNumBlocks;
+        cachedBlockDate = newBlockDate;
         cachedReindexing = fReindex;
         cachedImporting = fImporting;
 
-        emit numBlocksChanged(newNumBlocks);
+        emit numBlocksChanged(newNumBlocks, newBlockDate);
     }
 
     emit bytesChanged(getTotalBytesRecv(), getTotalBytesSent());

src/qt/clientmodel.h

@@ -6,6 +6,7 @@
 #define BITCOIN_QT_CLIENTMODEL_H
 
 #include <QObject>
+#include <QDateTime>
 
 class AddressTableModel;
 class OptionsModel;
@@ -15,7 +16,6 @@ class TransactionTableModel;
 class CWallet;
 
 QT_BEGIN_NAMESPACE
-class QDateTime;
 class QTimer;
 QT_END_NAMESPACE
 
@@ -73,6 +73,7 @@ private:
     PeerTableModel *peerTableModel;
 
     int cachedNumBlocks;
+    QDateTime cachedBlockDate;
     bool cachedReindexing;
     bool cachedImporting;
 
@@ -83,7 +84,7 @@ private:
 
 signals:
     void numConnectionsChanged(int count);
-    void numBlocksChanged(int count);
+    void numBlocksChanged(int count, const QDateTime& blockDate);
     void alertsChanged(const QString &warnings);
     void bytesChanged(quint64 totalBytesIn, quint64 totalBytesOut);
 

src/qt/rpcconsole.cpp

@@ -293,8 +293,8 @@ void RPCConsole::setClientModel(ClientModel *model)
         setNumConnections(model->getNumConnections());
         connect(model, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
 
-        setNumBlocks(model->getNumBlocks());
-        connect(model, SIGNAL(numBlocksChanged(int)), this, SLOT(setNumBlocks(int)));
+        setNumBlocks(model->getNumBlocks(), model->getLastBlockDate());
+        connect(model, SIGNAL(numBlocksChanged(int,QDateTime)), this, SLOT(setNumBlocks(int,QDateTime)));
 
         updateTrafficStats(model->getTotalBytesRecv(), model->getTotalBytesSent());
         connect(model, SIGNAL(bytesChanged(quint64,quint64)), this, SLOT(updateTrafficStats(quint64, quint64)));
@@ -404,11 +404,10 @@ void RPCConsole::setNumConnections(int count)
     ui->numberOfConnections->setText(connections);
 }
 
-void RPCConsole::setNumBlocks(int count)
+void RPCConsole::setNumBlocks(int count, const QDateTime& blockDate)
 {
     ui->numberOfBlocks->setText(QString::number(count));
-    if(clientModel)
-        ui->lastBlockTime->setText(clientModel->getLastBlockDate().toString());
+    ui->lastBlockTime->setText(blockDate.toString());
 }
 
 void RPCConsole::on_lineEdit_returnPressed()

src/qt/rpcconsole.h

@@ -63,8 +63,8 @@ public slots:
     void message(int category, const QString &message, bool html = false);
     /** Set number of connections shown in the UI */
     void setNumConnections(int count);
-    /** Set number of blocks shown in the UI */
-    void setNumBlocks(int count);
+    /** Set number of blocks and last block date shown in the UI */
+    void setNumBlocks(int count, const QDateTime& blockDate);
     /** Go forward or back in history */
     void browseHistory(int offset);
     /** Scroll console view to end */

src/qt/sendcoinsdialog.cpp

@@ -121,7 +121,7 @@ void SendCoinsDialog::setClientModel(ClientModel *clientModel)
     this->clientModel = clientModel;
 
     if (clientModel) {
-        connect(clientModel, SIGNAL(numBlocksChanged(int)), this, SLOT(updateSmartFeeLabel()));
+        connect(clientModel, SIGNAL(numBlocksChanged(int,QDateTime)), this, SLOT(updateSmartFeeLabel()));
     }
 }