qt, wallet: Add LoadWalletsActivity class

Also this commit moves wallets loading out from the main GUI thread.

Author: hebasto

src/qt/bitcoingui.cpp

@@ -659,9 +659,8 @@ void BitcoinGUI::setWalletController(WalletController* wallet_controller)
     GUIUtil::ExceptionSafeConnect(wallet_controller, &WalletController::walletAdded, this, &BitcoinGUI::addWallet);
     connect(wallet_controller, &WalletController::walletRemoved, this, &BitcoinGUI::removeWallet);
 
-    for (WalletModel* wallet_model : m_wallet_controller->getOpenWallets()) {
-        addWallet(wallet_model);
-    }
+    auto activity = new LoadWalletsActivity(m_wallet_controller, this);
+    activity->load();
 }
 
 WalletController* BitcoinGUI::getWalletController()

src/qt/walletcontroller.cpp

@@ -41,10 +41,6 @@ WalletController::WalletController(ClientModel& client_model, const PlatformStyl
         getOrCreateWallet(std::move(wallet));
     });
 
-    for (std::unique_ptr<interfaces::Wallet>& wallet : m_node.walletClient().getWallets()) {
-        getOrCreateWallet(std::move(wallet));
-    }
-
     m_activity_worker->moveToThread(m_activity_thread);
     m_activity_thread->start();
     QTimer::singleShot(0, m_activity_worker, []() {
@@ -342,3 +338,21 @@ void OpenWalletActivity::open(const std::string& path)
         QTimer::singleShot(0, this, &OpenWalletActivity::finish);
     });
 }
+
+LoadWalletsActivity::LoadWalletsActivity(WalletController* wallet_controller, QWidget* parent_widget)
+    : WalletControllerActivity(wallet_controller, parent_widget)
+{
+}
+
+void LoadWalletsActivity::load()
+{
+    showProgressDialog(tr("Loading wallets…"));
+
+    QTimer::singleShot(0, worker(), [this] {
+        for (auto& wallet : node().walletClient().getWallets()) {
+            m_wallet_controller->getOrCreateWallet(std::move(wallet));
+        }
+
+        QTimer::singleShot(0, this, [this] { Q_EMIT finished(); });
+    });
+}

src/qt/walletcontroller.h

@@ -148,4 +148,14 @@ class OpenWalletActivity : public WalletControllerActivity
     void finish();
 };
 
+class LoadWalletsActivity : public WalletControllerActivity
+{
+    Q_OBJECT
+
+public:
+    LoadWalletsActivity(WalletController* wallet_controller, QWidget* parent_widget);
+
+    void load();
+};
+
 #endif // BITCOIN_QT_WALLETCONTROLLER_H