Nextion upload and sensors (#1464)

Co-authored-by: Senex Crenshaw <senexcrenshaw@gmail.com>

esphome/components/nextion/nextion_component.h

@@ -0,0 +1,49 @@
+#pragma once
+#include "esphome/core/defines.h"
+#include "esphome/core/color.h"
+#include "nextion_base.h"
+
+namespace esphome {
+namespace nextion {
+class NextionComponent;
+
+class NextionComponent : public NextionComponentBase {
+ public:
+  void update_component_settings() override { this->update_component_settings(false); };
+
+  void update_component_settings(bool force_update) override;
+
+  void set_background_color(Color bco);
+  void set_background_pressed_color(Color bco2);
+  void set_foreground_color(Color pco);
+  void set_foreground_pressed_color(Color pco2);
+  void set_font_id(uint8_t font_id);
+  void set_visible(bool visible);
+
+ protected:
+  NextionBase *nextion_;
+
+  bool bco_needs_update_ = false;
+  bool bco_is_set_ = false;
+  Color bco_;
+  bool bco2_needs_update_ = false;
+  bool bco2_is_set_ = false;
+  Color bco2_;
+  bool pco_needs_update_ = false;
+  bool pco_is_set_ = false;
+  Color pco_;
+  bool pco2_needs_update_ = false;
+  bool pco2_is_set_ = false;
+  Color pco2_;
+  uint8_t font_id_ = 0;
+  bool font_id_needs_update_ = false;
+  bool font_id_is_set_ = false;
+
+  bool visible_ = true;
+  bool visible_needs_update_ = false;
+  bool visible_is_set_ = false;
+
+  // void send_state_to_nextion() = 0;
+};
+}  // namespace nextion
+}  // namespace esphome