Implement a simple LCD menu (#3406)

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

esphome/components/display_menu_base/menu_item.cpp

@@ -0,0 +1,179 @@
+#include "menu_item.h"
+
+#include <cstdio>
+
+namespace esphome {
+namespace display_menu_base {
+
+void MenuItem::on_enter() { this->on_enter_callbacks_.call(); }
+
+void MenuItem::on_leave() { this->on_leave_callbacks_.call(); }
+
+void MenuItem::on_value_() { this->on_value_callbacks_.call(); }
+
+#ifdef USE_SELECT
+std::string MenuItemSelect::get_value_text() const {
+  std::string result;
+
+  if (this->value_getter_.has_value()) {
+    result = this->value_getter_.value()(this);
+  } else {
+    if (this->select_var_ != nullptr) {
+      result = this->select_var_->state;
+    }
+  }
+
+  return result;
+}
+
+bool MenuItemSelect::select_next() {
+  bool changed = false;
+
+  if (this->select_var_ != nullptr) {
+    this->select_var_->make_call().select_next(true).perform();
+    changed = true;
+  }
+
+  return changed;
+}
+
+bool MenuItemSelect::select_prev() {
+  bool changed = false;
+
+  if (this->select_var_ != nullptr) {
+    this->select_var_->make_call().select_previous(true).perform();
+    changed = true;
+  }
+
+  return changed;
+}
+#endif  // USE_SELECT
+
+#ifdef USE_NUMBER
+std::string MenuItemNumber::get_value_text() const {
+  std::string result;
+
+  if (this->value_getter_.has_value()) {
+    result = this->value_getter_.value()(this);
+  } else {
+    char data[32];
+    snprintf(data, sizeof(data), this->format_.c_str(), get_number_value_());
+    result = data;
+  }
+
+  return result;
+}
+
+bool MenuItemNumber::select_next() {
+  bool changed = false;
+
+  if (this->number_var_ != nullptr) {
+    float last = this->number_var_->state;
+    this->number_var_->make_call().number_increment(false).perform();
+
+    if (this->number_var_->state != last) {
+      this->on_value_();
+      changed = true;
+    }
+  }
+
+  return changed;
+}
+
+bool MenuItemNumber::select_prev() {
+  bool changed = false;
+
+  if (this->number_var_ != nullptr) {
+    float last = this->number_var_->state;
+    this->number_var_->make_call().number_decrement(false).perform();
+
+    if (this->number_var_->state != last) {
+      this->on_value_();
+      changed = true;
+    }
+  }
+
+  return changed;
+}
+
+float MenuItemNumber::get_number_value_() const {
+  float result = 0.0;
+
+  if (this->number_var_ != nullptr) {
+    if (!this->number_var_->has_state() || this->number_var_->state < this->number_var_->traits.get_min_value()) {
+      result = this->number_var_->traits.get_min_value();
+    } else if (this->number_var_->state > this->number_var_->traits.get_max_value()) {
+      result = this->number_var_->traits.get_max_value();
+    } else {
+      result = this->number_var_->state;
+    }
+  }
+
+  return result;
+}
+#endif  // USE_NUMBER
+
+#ifdef USE_SWITCH
+std::string MenuItemSwitch::get_value_text() const {
+  std::string result;
+
+  if (this->value_getter_.has_value()) {
+    result = this->value_getter_.value()(this);
+  } else {
+    result = this->get_switch_state_() ? this->switch_on_text_ : this->switch_off_text_;
+  }
+
+  return result;
+}
+
+bool MenuItemSwitch::select_next() { return this->toggle_switch_(); }
+
+bool MenuItemSwitch::select_prev() { return this->toggle_switch_(); }
+
+bool MenuItemSwitch::get_switch_state_() const { return (this->switch_var_ != nullptr && this->switch_var_->state); }
+
+bool MenuItemSwitch::toggle_switch_() {
+  bool changed = false;
+
+  if (this->switch_var_ != nullptr) {
+    this->switch_var_->toggle();
+    this->on_value_();
+    changed = true;
+  }
+
+  return changed;
+}
+#endif  // USE_SWITCH
+
+std::string MenuItemCustom::get_value_text() const {
+  return (this->value_getter_.has_value()) ? this->value_getter_.value()(this) : "";
+}
+
+bool MenuItemCommand::select_next() {
+  this->on_value_();
+  return true;
+}
+
+bool MenuItemCommand::select_prev() {
+  this->on_value_();
+  return true;
+}
+
+bool MenuItemCustom::select_next() {
+  this->on_next_();
+  this->on_value_();
+  return true;
+}
+
+bool MenuItemCustom::select_prev() {
+  this->on_prev_();
+  this->on_value_();
+  return true;
+}
+
+void MenuItemCustom::on_next_() { this->on_next_callbacks_.call(); }
+
+void MenuItemCustom::on_prev_() { this->on_prev_callbacks_.call(); }
+
+}  // namespace display_menu_base
+}  // namespace esphome