GameCubePane: Use ConfigControls where applicable

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

@@ -0,0 +1,39 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "DolphinQt/Config/ConfigControls/ConfigText.h"
+
+#include <QLineEdit>
+
+ConfigText::ConfigText(const Config::Info<std::string>& setting) : ConfigText(setting, nullptr)
+{
+}
+
+ConfigText::ConfigText(const Config::Info<std::string>& setting, Config::Layer* layer)
+    : ConfigControl(setting.GetLocation(), layer), m_setting(setting)
+{
+  setText(QString::fromStdString(ReadValue(setting)));
+
+  connect(this, &QLineEdit::editingFinished, this, &ConfigText::Update);
+}
+
+void ConfigText::SetTextAndUpdate(const QString& text)
+{
+  if (text == this->text())
+    return;
+
+  setText(text);
+  Update();
+}
+
+void ConfigText::Update()
+{
+  const std::string value = text().toStdString();
+
+  SaveValue(m_setting, value);
+}
+
+void ConfigText::OnConfigChanged()
+{
+  setText(QString::fromStdString(ReadValue(m_setting)));
+}