Qt: Implement button mapping dialogs

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

@@ -0,0 +1,54 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt2/Config/Mapping/MappingWidget.h"
+
+class QCheckBox;
+class QFormLayout;
+class QGroupBox;
+class QHBoxLayout;
+class QLabel;
+class QVBoxLayout;
+
+class GCPadEmu final : public MappingWidget
+{
+public:
+  explicit GCPadEmu(MappingWindow* window);
+
+  InputConfig* GetConfig() override;
+
+private:
+  void LoadSettings() override;
+  void SaveSettings() override;
+  void CreateButtonsLayout();
+  void CreateControlstickLayout();
+  void CreateCStickLayout();
+  void CreateTriggersLayout();
+  void CreateDPadLayout();
+  void CreateMainLayout();
+  void ConnectWidgets();
+
+  // Main
+  QHBoxLayout* m_main_layout;
+
+  // Buttons
+  QGroupBox* m_buttons_box;
+  QFormLayout* m_buttons_layout;
+
+  // Control Stick
+  QGroupBox* m_controlstick_box;
+  QFormLayout* m_controlstick_layout;
+
+  // C Stick
+  QGroupBox* m_cstick_box;
+  QFormLayout* m_cstick_layout;
+
+  // Triggers
+  QGroupBox* m_triggers_box;
+  QFormLayout* m_triggers_layout;
+
+  // D-Pad
+  QGroupBox* m_dpad_box;
+  QFormLayout* m_dpad_layout;
+};