GUI: 'getAvailableBalance', use cached balance if the user did not select UTXO manually

No need to walk through the entire wallet's tx map. Used for 'walletModel::prepareTransaction' and 'useAvailable' flow in sendcoinsdialog.

1 files changed, 8 insertions, 1 deletions

diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index a7f290ba92..b5695cda7e 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -203,7 +203,9 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
         return DuplicateAddress;
     }
 
-    CAmount nBalance = m_wallet->getAvailableBalance(coinControl);
+    // If no coin was manually selected, use the cached balance
+    // Future: can merge this call with 'createTransaction'.
+    CAmount nBalance = getAvailableBalance(&coinControl);
 
     if(total > nBalance)
     {
@@ -608,3 +610,8 @@ uint256 WalletModel::getLastBlockProcessed() const
 {
     return m_client_model ? m_client_model->getBestBlockHash() : uint256{};
 }
+
+CAmount WalletModel::getAvailableBalance(const CCoinControl* control)
+{
+    return control && control->HasSelected() ? wallet().getAvailableBalance(*control) : getCachedBalance().balance;
+}