[Qt] Improve progress display during headers-sync and peer-finding

src/qt/bitcoingui.cpp

@@ -748,6 +748,15 @@ void BitcoinGUI::setNetworkActive(bool networkActive)
     updateNetworkState();
 }
 
+void BitcoinGUI::updateHeadersSyncProgressLabel()
+{
+    int64_t headersTipTime = clientModel->getHeaderTipTime();
+    int headersTipHeight = clientModel->getHeaderTipHeight();
+    int estHeadersLeft = (GetTime() - headersTipTime)/600;
+    if (estHeadersLeft > REQ_HEADER_HEIGHT_DELTA_SYNC)
+        progressBarLabel->setText(tr("Syncing Headers (%1%)...").arg(QString::number(100.0 / (headersTipHeight+estHeadersLeft)*headersTipHeight, 'f', 1)));
+}
+
 void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool header)
 {
     if (modalOverlay)
@@ -768,9 +777,11 @@ void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVer
     switch (blockSource) {
         case BLOCK_SOURCE_NETWORK:
             if (header) {
+                updateHeadersSyncProgressLabel();
                 return;
             }
             progressBarLabel->setText(tr("Synchronizing with network..."));
+            updateHeadersSyncProgressLabel();
             break;
         case BLOCK_SOURCE_DISK:
             if (header) {
@@ -786,8 +797,7 @@ void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVer
             if (header) {
                 return;
             }
-            // Case: not Importing, not Reindexing and no network connection
-            progressBarLabel->setText(tr("No block source available..."));
+            progressBarLabel->setText(tr("Connecting to peers..."));
             break;
     }
 

src/qt/bitcoingui.h

@@ -149,6 +149,8 @@ private:
     /** Update UI with latest network info from model. */
     void updateNetworkState();
 
+    void updateHeadersSyncProgressLabel();
+
 Q_SIGNALS:
     /** Signal raised when a URI was entered or dragged to the GUI */
     void receivedURI(const QString &uri);

src/qt/clientmodel.h

@@ -66,7 +66,7 @@ public:
 
     //! Return true if core is doing initial block download
     bool inInitialBlockDownload() const;
-    //! Return true if core is importing blocks
+    //! Returns enum BlockSource of the current importing/syncing state
     enum BlockSource getBlockSource() const;
     //! Return true if network activity in core is enabled
     bool getNetworkActive() const;

src/qt/modaloverlay.h

@@ -8,6 +8,9 @@
 #include <QDateTime>
 #include <QWidget>
 
+//! The required delta of headers to the estimated number of available headers until we show the IBD progress
+static const int REQ_HEADER_HEIGHT_DELTA_SYNC = 24;
+
 namespace Ui {
     class ModalOverlay;
 }