[gui] Defer coin control instancing

Defer the GUI coin control instancing so that argument processing
is taken into account for the default coin control values.

src/qt/coincontroldialog.cpp

@@ -31,7 +31,6 @@
 #include <QTreeWidget>
 
 QList<CAmount> CoinControlDialog::payAmounts;
-CCoinControl* CoinControlDialog::coinControl = new CCoinControl();
 bool CoinControlDialog::fSubtractFeeFromAmount = false;
 
 bool CCoinControlWidgetItem::operator<(const QTreeWidgetItem &other) const {
@@ -193,7 +192,7 @@ void CoinControlDialog::buttonSelectAllClicked()
                 ui->treeWidget->topLevelItem(i)->setCheckState(COLUMN_CHECKBOX, state);
     ui->treeWidget->setEnabled(true);
     if (state == Qt::Unchecked)
-        coinControl->UnSelectAll(); // just to be sure
+        coinControl()->UnSelectAll(); // just to be sure
     CoinControlDialog::updateLabels(model, this);
 }
 
@@ -379,11 +378,11 @@ void CoinControlDialog::viewItemChanged(QTreeWidgetItem* item, int column)
         COutPoint outpt(uint256S(item->text(COLUMN_TXHASH).toStdString()), item->text(COLUMN_VOUT_INDEX).toUInt());
 
         if (item->checkState(COLUMN_CHECKBOX) == Qt::Unchecked)
-            coinControl->UnSelect(outpt);
+            coinControl()->UnSelect(outpt);
         else if (item->isDisabled()) // locked (this happens if "check all" through parent node)
             item->setCheckState(COLUMN_CHECKBOX, Qt::Unchecked);
         else
-            coinControl->Select(outpt);
+            coinControl()->Select(outpt);
 
         // selection changed -> update labels
         if (ui->treeWidget->isEnabled()) // do not update on every click for (un)select all
@@ -446,7 +445,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
 
     std::vector<COutPoint> vCoinControl;
     std::vector<COutput>   vOutputs;
-    coinControl->ListSelected(vCoinControl);
+    coinControl()->ListSelected(vCoinControl);
     model->getOutputs(vCoinControl, vOutputs);
 
     for (const COutput& out : vOutputs) {
@@ -456,7 +455,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
         COutPoint outpt(txhash, out.i);
         if (model->isSpent(outpt))
         {
-            coinControl->UnSelect(outpt);
+            coinControl()->UnSelect(outpt);
             continue;
         }
 
@@ -509,7 +508,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
                 nBytes -= 34;
 
         // Fee
-        nPayFee = GetMinimumFee(nBytes, *coinControl, ::mempool, ::feeEstimator, nullptr /* FeeCalculation */);
+        nPayFee = GetMinimumFee(nBytes, *coinControl(), ::mempool, ::feeEstimator, nullptr /* FeeCalculation */);
 
         if (nPayAmount > 0)
         {
@@ -600,6 +599,12 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
         label->setVisible(nChange < 0);
 }
 
+CCoinControl* CoinControlDialog::coinControl()
+{
+    static CCoinControl coin_control;
+    return &coin_control;
+}
+
 void CoinControlDialog::updateView()
 {
     if (!model || !model->getOptionsModel() || !model->getAddressTableModel())
@@ -703,13 +708,13 @@ void CoinControlDialog::updateView()
             if (model->isLockedCoin(txhash, out.i))
             {
                 COutPoint outpt(txhash, out.i);
-                coinControl->UnSelect(outpt); // just to be sure
+                coinControl()->UnSelect(outpt); // just to be sure
                 itemOutput->setDisabled(true);
                 itemOutput->setIcon(COLUMN_CHECKBOX, platformStyle->SingleColorIcon(":/icons/lock_closed"));
             }
 
             // set checkbox
-            if (coinControl->IsSelected(COutPoint(txhash, out.i)))
+            if (coinControl()->IsSelected(COutPoint(txhash, out.i)))
                 itemOutput->setCheckState(COLUMN_CHECKBOX, Qt::Checked);
         }
 

src/qt/coincontroldialog.h

@@ -52,7 +52,7 @@ public:
     static void updateLabels(WalletModel*, QDialog*);
 
     static QList<CAmount> payAmounts;
-    static CCoinControl *coinControl;
+    static CCoinControl *coinControl();
     static bool fSubtractFeeFromAmount;
 
 private:

src/qt/sendcoinsdialog.cpp

@@ -256,7 +256,7 @@ void SendCoinsDialog::on_sendButton_clicked()
     // Always use a CCoinControl instance, use the CoinControlDialog instance if CoinControl has been enabled
     CCoinControl ctrl;
     if (model->getOptionsModel()->getCoinControlFeatures())
-        ctrl = *CoinControlDialog::coinControl;
+        ctrl = *CoinControlDialog::coinControl();
 
     updateCoinControlState(ctrl);
 
@@ -367,7 +367,7 @@ void SendCoinsDialog::on_sendButton_clicked()
     if (sendStatus.status == WalletModel::OK)
     {
         accept();
-        CoinControlDialog::coinControl->UnSelectAll();
+        CoinControlDialog::coinControl()->UnSelectAll();
         coinControlUpdateLabels();
     }
     fNewRecipientAllowed = true;
@@ -604,7 +604,7 @@ void SendCoinsDialog::useAvailableBalance(SendCoinsEntry* entry)
     // Get CCoinControl instance if CoinControl is enabled or create a new one.
     CCoinControl coin_control;
     if (model->getOptionsModel()->getCoinControlFeatures()) {
-        coin_control = *CoinControlDialog::coinControl;
+        coin_control = *CoinControlDialog::coinControl();
     }
 
     // Calculate available amount to send.
@@ -754,7 +754,7 @@ void SendCoinsDialog::coinControlFeatureChanged(bool checked)
     ui->frameCoinControl->setVisible(checked);
 
     if (!checked && model) // coin control features disabled
-        CoinControlDialog::coinControl->SetNull();
+        CoinControlDialog::coinControl()->SetNull();
 
     coinControlUpdateLabels();
 }
@@ -773,7 +773,7 @@ void SendCoinsDialog::coinControlChangeChecked(int state)
 {
     if (state == Qt::Unchecked)
     {
-        CoinControlDialog::coinControl->destChange = CNoDestination();
+        CoinControlDialog::coinControl()->destChange = CNoDestination();
         ui->labelCoinControlChangeLabel->clear();
     }
     else
@@ -789,7 +789,7 @@ void SendCoinsDialog::coinControlChangeEdited(const QString& text)
     if (model && model->getAddressTableModel())
     {
         // Default to no change address until verified
-        CoinControlDialog::coinControl->destChange = CNoDestination();
+        CoinControlDialog::coinControl()->destChange = CNoDestination();
         ui->labelCoinControlChangeLabel->setStyleSheet("QLabel{color:red;}");
 
         const CTxDestination dest = DecodeDestination(text.toStdString());
@@ -812,7 +812,7 @@ void SendCoinsDialog::coinControlChangeEdited(const QString& text)
                     QMessageBox::Yes | QMessageBox::Cancel, QMessageBox::Cancel);
 
                 if(btnRetVal == QMessageBox::Yes)
-                    CoinControlDialog::coinControl->destChange = dest;
+                    CoinControlDialog::coinControl()->destChange = dest;
                 else
                 {
                     ui->lineEditCoinControlChange->setText("");
@@ -831,7 +831,7 @@ void SendCoinsDialog::coinControlChangeEdited(const QString& text)
                 else
                     ui->labelCoinControlChangeLabel->setText(tr("(no label)"));
 
-                CoinControlDialog::coinControl->destChange = dest;
+                CoinControlDialog::coinControl()->destChange = dest;
             }
         }
     }
@@ -843,7 +843,7 @@ void SendCoinsDialog::coinControlUpdateLabels()
     if (!model || !model->getOptionsModel())
         return;
 
-    updateCoinControlState(*CoinControlDialog::coinControl);
+    updateCoinControlState(*CoinControlDialog::coinControl());
 
     // set pay amounts
     CoinControlDialog::payAmounts.clear();
@@ -861,7 +861,7 @@ void SendCoinsDialog::coinControlUpdateLabels()
         }
     }
 
-    if (CoinControlDialog::coinControl->HasSelected())
+    if (CoinControlDialog::coinControl()->HasSelected())
     {
         // actual coin control calculation
         CoinControlDialog::updateLabels(model, this);