GameCubePane: Use ConfigControls where applicable

Source/Core/DolphinQt/Config/ConfigControls/ConfigUserPath.cpp

@@ -0,0 +1,59 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "DolphinQt/Config/ConfigControls/ConfigUserPath.h"
+
+#include <QLineEdit>
+#include <QString>
+
+#include "Common/FileUtil.h"
+
+#include "DolphinQt/Config/ConfigControls/ConfigText.h"
+#include "DolphinQt/QtUtils/ModalMessageBox.h"
+
+ConfigUserPath::ConfigUserPath(const unsigned int dir_index,
+                               const Config::Info<std::string>& setting)
+    : ConfigUserPath(dir_index, setting, nullptr)
+{
+}
+
+ConfigUserPath::ConfigUserPath(const unsigned int dir_index,
+                               const Config::Info<std::string>& setting, Config::Layer* layer)
+    : ConfigText(setting, layer), m_dir_index(dir_index)
+{
+  OnConfigChanged();
+
+  connect(this, &QLineEdit::editingFinished, this, &ConfigUserPath::Update);
+}
+
+// Display the effective path: if Config has a value, use it; otherwise fall back to UserPath.
+// Config values only serve to initialize UserPath at startup, an empty config meaning "use the
+// current UserPath".
+void ConfigUserPath::RefreshText()
+{
+  const std::string config_value = ReadValue(m_setting);
+  const std::string userpath_value = File::GetUserPath(m_dir_index);
+  const QString text = QString::fromStdString(config_value.empty() ? userpath_value : config_value);
+  setText(text);
+}
+
+void ConfigUserPath::Update()
+{
+  const QString new_text = text().trimmed();
+  if (new_text.isEmpty())
+  {
+    ModalMessageBox::warning(this, tr("Empty Value"),
+                             tr("This field cannot be left empty. Please enter a value."));
+    RefreshText();
+    return;
+  }
+
+  const std::string value = new_text.toStdString();
+  File::SetUserPath(m_dir_index, value);
+  SaveValue(m_setting, value);
+}
+
+void ConfigUserPath::OnConfigChanged()
+{
+  RefreshText();
+}