wizard: allow setting subaddress lookahead

src/wizard/PageSetSubaddressLookahead.cpp

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// SPDX-FileCopyrightText: 2020-2023 The Monero Project
+
+#include "PageSetSubaddressLookahead.h"
+#include "ui_PageSetSubaddressLookahead.h"
+#include "WalletWizard.h"
+
+#include <QIntValidator>
+
+PageSetSubaddressLookahead::PageSetSubaddressLookahead(WizardFields *fields, QWidget *parent)
+        : QWizardPage(parent)
+        , ui(new Ui::PageSetSubaddressLookahead)
+        , m_fields(fields)
+{
+    ui->setupUi(this);
+
+    // uint32_t can go up to 4294967294, but this isn't realistic
+    auto indexValidator = new QIntValidator(1, 2147483647, this);
+
+    ui->line_major->setValidator(indexValidator);
+    ui->line_minor->setValidator(indexValidator);
+
+    this->setTitle("Subaddress Lookahead");
+}
+
+void PageSetSubaddressLookahead::initializePage() {
+    if (m_fields->mode == WizardMode::CreateWalletFromDevice) {
+        ui->line_major->setText("5");
+        ui->line_minor->setText("20");
+    } else {
+        ui->line_major->setText("50");
+        ui->line_minor->setText("200");
+    }
+}
+
+bool PageSetSubaddressLookahead::validatePage() {
+    m_fields->subaddressLookahead = QString("%1:%2").arg(ui->line_major->text(), ui->line_minor->text());
+    return true;
+}
+
+int PageSetSubaddressLookahead::nextId() const {
+    return WalletWizard::Page_WalletFile;
+}