Simulation GUI: Refactor ini saving (#2291)

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

@@ -0,0 +1,57 @@
+/*----------------------------------------------------------------------------*/
+/* 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
+
+namespace halsimgui {
+
+template <typename Info>
+void IniSaverString<Info>::Initialize() {
+  // hook ini handler to save settings
+  ImGuiSettingsHandler iniHandler;
+  iniHandler.TypeName = m_typeName;
+  iniHandler.TypeHash = ImHashStr(m_typeName);
+  iniHandler.ReadOpenFn = ReadOpen;
+  iniHandler.ReadLineFn = ReadLine;
+  iniHandler.WriteAllFn = WriteAll;
+  iniHandler.UserData = this;
+  ImGui::GetCurrentContext()->SettingsHandlers.push_back(iniHandler);
+}
+
+template <typename Info>
+void* IniSaverString<Info>::ReadOpen(ImGuiContext* ctx,
+                                     ImGuiSettingsHandler* handler,
+                                     const char* name) {
+  auto self = static_cast<IniSaverString*>(handler->UserData);
+  return &self->m_map[name];
+}
+
+template <typename Info>
+void IniSaverString<Info>::ReadLine(ImGuiContext* ctx,
+                                    ImGuiSettingsHandler* handler, void* entry,
+                                    const char* lineStr) {
+  auto element = static_cast<Info*>(entry);
+  wpi::StringRef line{lineStr};
+  auto [name, value] = line.split('=');
+  name = name.trim();
+  value = value.trim();
+  element->ReadIni(name, value);
+}
+
+template <typename Info>
+void IniSaverString<Info>::WriteAll(ImGuiContext* ctx,
+                                    ImGuiSettingsHandler* handler,
+                                    ImGuiTextBuffer* out_buf) {
+  auto self = static_cast<IniSaverString*>(handler->UserData);
+  for (auto&& it : self->m_map) {
+    out_buf->appendf("[%s][%s]\n", self->m_typeName, it.getKey().data());
+    it.second.WriteIni(out_buf);
+    out_buf->append("\n");
+  }
+}
+
+}  // namespace halsimgui