gui: create wallet with external signer

src/qt/createwalletdialog.cpp

@@ -27,14 +27,39 @@ CreateWalletDialog::CreateWalletDialog(QWidget* parent) :
     });
 
     connect(ui->encrypt_wallet_checkbox, &QCheckBox::toggled, [this](bool checked) {
-        // Disable the disable_privkeys_checkbox when isEncryptWalletChecked is
+        // Disable the disable_privkeys_checkbox and external_signer_checkbox when isEncryptWalletChecked is
         // set to true, enable it when isEncryptWalletChecked is false.
         ui->disable_privkeys_checkbox->setEnabled(!checked);
+        ui->external_signer_checkbox->setEnabled(!checked);
 
         // When the disable_privkeys_checkbox is disabled, uncheck it.
         if (!ui->disable_privkeys_checkbox->isEnabled()) {
             ui->disable_privkeys_checkbox->setChecked(false);
         }
+
+        // When the external_signer_checkbox box is disabled, uncheck it.
+        if (!ui->external_signer_checkbox->isEnabled()) {
+            ui->external_signer_checkbox->setChecked(false);
+        }
+
+    });
+
+    connect(ui->external_signer_checkbox, &QCheckBox::toggled, [this](bool checked) {
+        ui->encrypt_wallet_checkbox->setEnabled(!checked);
+        ui->blank_wallet_checkbox->setEnabled(!checked);
+        ui->disable_privkeys_checkbox->setEnabled(!checked);
+        ui->descriptor_checkbox->setEnabled(!checked);
+
+        // The external signer checkbox is only enabled when a device is detected.
+        // In that case it is checked by default. Toggling it restores the other
+        // options to their default.
+        ui->descriptor_checkbox->setChecked(checked);
+        ui->encrypt_wallet_checkbox->setChecked(false);
+        ui->disable_privkeys_checkbox->setChecked(checked);
+        // The blank check box is ambiguous. This flag is always true for a
+        // watch-only wallet, even though we immedidately fetch keys from the
+        // external signer.
+        ui->blank_wallet_checkbox->setChecked(checked);
     });
 
     connect(ui->disable_privkeys_checkbox, &QCheckBox::toggled, [this](bool checked) {
@@ -63,11 +88,22 @@ CreateWalletDialog::CreateWalletDialog(QWidget* parent) :
         ui->descriptor_checkbox->setToolTip(tr("Compiled without sqlite support (required for descriptor wallets)"));
         ui->descriptor_checkbox->setEnabled(false);
         ui->descriptor_checkbox->setChecked(false);
+        ui->external_signer_checkbox->setEnabled(false);
+        ui->external_signer_checkbox->setChecked(false);
 #endif
+
 #ifndef USE_BDB
         ui->descriptor_checkbox->setEnabled(false);
         ui->descriptor_checkbox->setChecked(true);
 #endif
+
+#ifndef ENABLE_EXTERNAL_SIGNER
+        //: "External signing" means using devices such as hardware wallets.
+        ui->external_signer_checkbox->setToolTip(tr("Compiled without external signing support (required for external signing)"));
+        ui->external_signer_checkbox->setEnabled(false);
+        ui->external_signer_checkbox->setChecked(false);
+#endif
+
 }
 
 CreateWalletDialog::~CreateWalletDialog()
@@ -99,3 +135,8 @@ bool CreateWalletDialog::isDescriptorWalletChecked() const
 {
     return ui->descriptor_checkbox->isChecked();
 }
+
+bool CreateWalletDialog::isExternalSignerChecked() const
+{
+    return ui->external_signer_checkbox->isChecked();
+}

src/qt/createwalletdialog.h

@@ -28,6 +28,7 @@ public:
     bool isDisablePrivateKeysChecked() const;
     bool isMakeBlankWalletChecked() const;
     bool isDescriptorWalletChecked() const;
+    bool isExternalSignerChecked() const;
 
 private:
     Ui::CreateWalletDialog *ui;

src/qt/forms/createwalletdialog.ui

@@ -109,6 +109,16 @@
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="QCheckBox" name="external_signer_checkbox">
+        <property name="toolTip">
+         <string>Use an external signing device such as a hardware wallet. Configure the external signer script in wallet preferences first.</string>
+        </property>
+        <property name="text">
+         <string>External signer</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>
@@ -143,6 +153,7 @@
   <tabstop>disable_privkeys_checkbox</tabstop>
   <tabstop>blank_wallet_checkbox</tabstop>
   <tabstop>descriptor_checkbox</tabstop>
+  <tabstop>external_signer_checkbox</tabstop>
  </tabstops>
  <resources/>
  <connections>

src/qt/walletcontroller.cpp

@@ -260,6 +260,9 @@ void CreateWalletActivity::createWallet()
     if (m_create_wallet_dialog->isDescriptorWalletChecked()) {
         flags |= WALLET_FLAG_DESCRIPTORS;
     }
+    if (m_create_wallet_dialog->isExternalSignerChecked()) {
+        flags |= WALLET_FLAG_EXTERNAL_SIGNER;
+    }
 
     QTimer::singleShot(500, worker(), [this, name, flags] {
         std::unique_ptr<interfaces::Wallet> wallet = node().walletClient().createWallet(name, m_passphrase, flags, m_error_message, m_warning_message);