[lvgl] Final stage (#7184)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/lvgl/select/lvgl_select.h

@@ -0,0 +1,62 @@
+#pragma once
+
+#include "esphome/components/select/select.h"
+#include "esphome/core/automation.h"
+#include "esphome/core/component.h"
+#include "esphome/core/preferences.h"
+
+namespace esphome {
+namespace lvgl {
+
+static std::vector<std::string> split_string(const std::string &str) {
+  std::vector<std::string> strings;
+  auto delimiter = std::string("\n");
+
+  std::string::size_type pos;
+  std::string::size_type prev = 0;
+  while ((pos = str.find(delimiter, prev)) != std::string::npos) {
+    strings.push_back(str.substr(prev, pos - prev));
+    prev = pos + delimiter.size();
+  }
+
+  // To get the last substring (or only, if delimiter is not found)
+  strings.push_back(str.substr(prev));
+
+  return strings;
+}
+
+class LVGLSelect : public select::Select {
+ public:
+  void set_control_lambda(std::function<void(size_t)> lambda) {
+    this->control_lambda_ = lambda;
+    if (this->initial_state_.has_value()) {
+      this->control(this->initial_state_.value());
+      this->initial_state_.reset();
+    }
+  }
+
+  void publish_index(size_t index) {
+    auto value = this->at(index);
+    if (value)
+      this->publish_state(value.value());
+  }
+
+  void set_options(const char *str) { this->traits.set_options(split_string(str)); }
+
+ protected:
+  void control(const std::string &value) override {
+    if (this->control_lambda_ != nullptr) {
+      auto index = index_of(value);
+      if (index)
+        this->control_lambda_(index.value());
+    } else {
+      this->initial_state_ = value.c_str();
+    }
+  }
+
+  std::function<void(size_t)> control_lambda_{};
+  optional<const char *> initial_state_{};
+};
+
+}  // namespace lvgl
+}  // namespace esphome