Qt: Implement button mapping dialogs

Source/Core/DolphinQt2/Config/Mapping/MappingNumeric.h

@@ -0,0 +1,31 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QSpinBox>
+#include <QString>
+
+class MappingWidget;
+
+namespace ControllerEmu
+{
+class NumericSetting;
+};
+
+class MappingNumeric : public QSpinBox
+{
+public:
+  MappingNumeric(MappingWidget* widget, ControllerEmu::NumericSetting* ref);
+
+  void Clear();
+  void Update();
+
+private:
+  void Connect();
+
+  MappingWidget* m_parent;
+  ControllerEmu::NumericSetting* m_setting;
+  double m_range;
+};