Insert a more solid abstraction between Qt and Imgui

Source/Core/VideoCommon/OnScreenUIKeyMap.h

@@ -0,0 +1,37 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "Common/EnumMap.h"
+
+// The main point of this is to allow other parts of dolphin to set ImGui's key map without
+// having to import ImGui headers.
+// But the idea is that it can be expanded in the future with more keys to support more things.
+enum class DolphinKey
+{
+  Tab,
+  LeftArrow,
+  RightArrow,
+  UpArrow,
+  DownArrow,
+  PageUp,
+  PageDown,
+  Home,
+  End,
+  Insert,
+  Delete,
+  Backspace,
+  Space,
+  Enter,
+  Escape,
+  KeyPadEnter,
+  A,  // for text edit CTRL+A: select all
+  C,  // for text edit CTRL+C: copy
+  V,  // for text edit CTRL+V: paste
+  X,  // for text edit CTRL+X: cut
+  Y,  // for text edit CTRL+Y: redo
+  Z,  // for text edit CTRL+Z: undo
+};
+
+using DolphinKeyMap = Common::EnumMap<int, DolphinKey::Z>;