Qt: Implement search

Source/Core/DolphinQt2/SearchBar.h

@@ -0,0 +1,31 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QWidget>
+
+class QCheckBox;
+class QLineEdit;
+class QPushButton;
+
+class SearchBar : public QWidget
+{
+  Q_OBJECT
+public:
+  explicit SearchBar(QWidget* parent = nullptr);
+
+  void Toggle();
+signals:
+  void Search(const QString& serach);
+
+private:
+  void CreateWidgets();
+  void ConnectWidgets();
+
+  QLineEdit* m_search_edit;
+  QCheckBox* m_wii_check;
+  QCheckBox* m_gc_check;
+  QPushButton* m_close_button;
+};