Simulation GUI: Refactor ini saving (#2291)

simulation/halsim_gui/src/main/native/include/IniSaverString.h

@@ -0,0 +1,48 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#pragma once
+
+#include <imgui.h>
+#include <imgui_internal.h>
+#include <wpi/StringMap.h>
+#include <wpi/StringRef.h>
+
+namespace halsimgui {
+
+template <typename Info>
+class IniSaverString {
+ public:
+  explicit IniSaverString(const char* typeName) : m_typeName(typeName) {}
+  void Initialize();
+
+  // pass through useful functions to map
+  Info& operator[](wpi::StringRef key) { return m_map[key]; }
+
+  auto begin() { return m_map.begin(); }
+  auto end() { return m_map.end(); }
+  auto find(wpi::StringRef key) { return m_map.find(key); }
+
+  auto begin() const { return m_map.begin(); }
+  auto end() const { return m_map.end(); }
+  auto find(wpi::StringRef key) const { return m_map.find(key); }
+
+ private:
+  static void* ReadOpen(ImGuiContext* ctx, ImGuiSettingsHandler* handler,
+                        const char* name);
+  static void ReadLine(ImGuiContext* ctx, ImGuiSettingsHandler* handler,
+                       void* entry, const char* lineStr);
+  static void WriteAll(ImGuiContext* ctx, ImGuiSettingsHandler* handler,
+                       ImGuiTextBuffer* out_buf);
+
+  const char* m_typeName;
+  wpi::StringMap<Info> m_map;
+};
+
+}  // namespace halsimgui
+
+#include "IniSaverString.inl"