rework ClientModel::getBlockSource() + BitcoinGUI::setNumBlocks()

- updates ClientModel::getBlockSource() to return all available states and
  sorts enum BlockSource in order of usage cases (none default, then reindex,
  import and network)
- updates BitcoinGUI::setNumBlocks() to better use getBlockSource() and
  also adds a message, when we have NO block source available

src/qt/bitcoingui.cpp

@@ -514,31 +514,26 @@ void BitcoinGUI::setNumBlocks(int count, int nTotalBlocks)
     // Prevent orphan statusbar messages (e.g. hover Quit in main menu, wait until chain-sync starts -> garbelled text)
     statusBar()->clearMessage();
 
-    // don't show / hide progress bar and its label if we have no connection to the network
-    enum BlockSource blockSource = clientModel ? clientModel->getBlockSource() : BLOCK_SOURCE_NONE;
-    if (blockSource == BLOCK_SOURCE_NONE || (blockSource == BLOCK_SOURCE_NETWORK && clientModel->getNumConnections() == 0))
-    {
-        progressBarLabel->setVisible(false);
-        progressBar->setVisible(false);
-
-        return;
-    }
-
-    QString tooltip;
-
-    QString importText;
+    // Acquire current block source
+    enum BlockSource blockSource = clientModel->getBlockSource();
     switch (blockSource) {
-    case BLOCK_SOURCE_NONE:
         case BLOCK_SOURCE_NETWORK:
-        importText = tr("Synchronizing with network...");
+            progressBarLabel->setText(tr("Synchronizing with network..."));
             break;
         case BLOCK_SOURCE_DISK:
-        importText = tr("Importing blocks from disk...");
+            progressBarLabel->setText(tr("Importing blocks from disk..."));
             break;
         case BLOCK_SOURCE_REINDEX:
-        importText = tr("Reindexing blocks on disk...");
+            progressBarLabel->setText(tr("Reindexing blocks on disk..."));
+            break;
+        case BLOCK_SOURCE_NONE:
+            // Case: not Importing, not Reindexing and no network connection
+            progressBarLabel->setText(tr("No block source available..."));
+            break;
     }
 
+    QString tooltip;
+
     QDateTime lastBlockDate = clientModel->getLastBlockDate();
     QDateTime currentDate = QDateTime::currentDateTime();
     int secs = lastBlockDate.secsTo(currentDate);
@@ -580,7 +575,6 @@ void BitcoinGUI::setNumBlocks(int count, int nTotalBlocks)
             timeBehindText = tr("%n week(s)","",secs/(7*24*60*60));
         }
 
-        progressBarLabel->setText(importText);
         progressBarLabel->setVisible(true);
         progressBar->setFormat(tr("%1 behind").arg(timeBehindText));
         progressBar->setMaximum(1000000000);

src/qt/clientmodel.cpp

@@ -122,9 +122,12 @@ enum BlockSource ClientModel::getBlockSource() const
 {
     if (fReindex)
         return BLOCK_SOURCE_REINDEX;
-    if (fImporting)
+    else if (fImporting)
         return BLOCK_SOURCE_DISK;
+    else if (getNumConnections() > 0)
         return BLOCK_SOURCE_NETWORK;
+
+    return BLOCK_SOURCE_NONE;
 }
 
 int ClientModel::getNumBlocksOfPeers() const

src/qt/clientmodel.h

@@ -15,9 +15,9 @@ QT_END_NAMESPACE
 
 enum BlockSource {
     BLOCK_SOURCE_NONE,
-    BLOCK_SOURCE_NETWORK,
+    BLOCK_SOURCE_REINDEX,
     BLOCK_SOURCE_DISK,
-    BLOCK_SOURCE_REINDEX
+    BLOCK_SOURCE_NETWORK
 };
 
 /** Model for Bitcoin network client. */