gui: Add Intro::UpdateFreeSpaceLabel()

If a new custom datadir has enough free space, the prune checkbox gets
unchecked, unless -prune=NNN command-line option is provided.

Author: hebasto

src/qt/intro.cpp

@@ -251,24 +251,31 @@ void Intro::setStatus(int status, const QString &message, quint64 bytesAvailable
     {
         ui->freeSpace->setText("");
     } else {
-        QString freeString = tr("%n GB of free space available", "", bytesAvailable/GB_BYTES);
-        if (bytesAvailable < m_required_space_gb * GB_BYTES) {
-            freeString += " " + tr("(of %n GB needed)", "", m_required_space_gb);
-            ui->freeSpace->setStyleSheet("QLabel { color: #800000 }");
-            ui->prune->setChecked(true);
-        } else if (bytesAvailable / GB_BYTES - m_required_space_gb < 10) {
-            freeString += " " + tr("(%n GB needed for full chain)", "", m_required_space_gb);
-            ui->freeSpace->setStyleSheet("QLabel { color: #999900 }");
-            ui->prune->setChecked(true);
-        } else {
-            ui->freeSpace->setStyleSheet("");
+        m_bytes_available = bytesAvailable;
+        if (ui->prune->isEnabled()) {
+            ui->prune->setChecked(m_bytes_available < (m_blockchain_size_gb + m_chain_state_size_gb + 10) * GB_BYTES);
         }
-        ui->freeSpace->setText(freeString + ".");
+        UpdateFreeSpaceLabel();
     }
     /* Don't allow confirm in ERROR state */
     ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(status != FreespaceChecker::ST_ERROR);
 }
 
+void Intro::UpdateFreeSpaceLabel()
+{
+    QString freeString = tr("%n GB of free space available", "", m_bytes_available / GB_BYTES);
+    if (m_bytes_available < m_required_space_gb * GB_BYTES) {
+        freeString += " " + tr("(of %n GB needed)", "", m_required_space_gb);
+        ui->freeSpace->setStyleSheet("QLabel { color: #800000 }");
+    } else if (m_bytes_available / GB_BYTES - m_required_space_gb < 10) {
+        freeString += " " + tr("(%n GB needed for full chain)", "", m_required_space_gb);
+        ui->freeSpace->setStyleSheet("QLabel { color: #999900 }");
+    } else {
+        ui->freeSpace->setStyleSheet("");
+    }
+    ui->freeSpace->setText(freeString + ".");
+}
+
 void Intro::on_dataDirectory_textChanged(const QString &dataDirStr)
 {
     /* Disable OK button until check result comes in */

src/qt/intro.h

@@ -71,11 +71,13 @@ private Q_SLOTS:
     const int64_t m_chain_state_size_gb;
     //! Total required space (in GB) depending on user choice (prune or not prune).
     int64_t m_required_space_gb{0};
+    uint64_t m_bytes_available{0};
 
     void startThread();
     void checkPath(const QString &dataDir);
     QString getPathToCheck();
     void UpdatePruneLabels(int64_t prune_target_gb);
+    void UpdateFreeSpaceLabel();
 
     friend class FreespaceChecker;
 };