ink-board/main/ui/interaction_handler.cpp

#include "ui/interaction_handler.h"
#include "ui/events.h"
#include "esp_err.h"
#include "esp_log.h"

#define TAG "InteractionHandler"

InteractionHandler::~InteractionHandler() {
  esp_err_t err = deinit();
  if (err != ESP_OK) {
    ESP_LOGE(TAG, "Error during InteractionHandler deinit: %s", esp_err_to_name(err));
  }
}

esp_err_t InteractionHandler::init(lv_obj_t* app_container) {
  if (!app_container) {
    ESP_LOGE(TAG, "Invalid argument: app_container is nullptr");
    return ESP_ERR_INVALID_ARG;
  }
  app_container_ = app_container;
  keyboard_ = lv_keyboard_create(app_container_);
  lv_obj_add_flag(keyboard_, LV_OBJ_FLAG_HIDDEN); // start hidden
  lv_obj_add_event_cb(
    keyboard_,
    [](lv_event_t* e) {
      InteractionHandler* handler = static_cast<InteractionHandler*>(lv_event_get_user_data(e));
      handler->on_keyboard_event_(e);
    }
  , LV_EVENT_ALL, this);

  return ESP_OK;
}

esp_err_t InteractionHandler::deinit(void) {
  if (keyboard_) {
    lv_obj_del(keyboard_);
    keyboard_ = nullptr;
  }
  return ESP_OK;
}

esp_err_t InteractionHandler::register_text_area_keyboard_support(lv_obj_t* text_area) {
  if (!text_area) {
    ESP_LOGE(TAG, "Invalid argument: text_area is nullptr");
    return ESP_ERR_INVALID_ARG;
  }

  lv_obj_add_event_cb(
    text_area,
    [](lv_event_t* e) {
      lv_event_code_t code = lv_event_get_code(e);
      if (code != LV_EVENT_FOCUSED) {
        return;
      }
      InteractionHandler* handler = static_cast<InteractionHandler*>(lv_event_get_user_data(e));

      esp_err_t err = handler->show_keyboard_for_textarea_(static_cast<lv_obj_t*>(lv_event_get_target(e)));
      if (err != ESP_OK) {
        ESP_LOGE(TAG, "Failed to show keyboard: %s", esp_err_to_name(err));
      }
    }
  , LV_EVENT_FOCUSED, this);

  lv_obj_add_event_cb(
    text_area,
    [](lv_event_t* e) {
      lv_event_code_t code = lv_event_get_code(e);
      if (code != LV_EVENT_DEFOCUSED) {
        return;
      }
      InteractionHandler* handler = static_cast<InteractionHandler*>(lv_event_get_user_data(e));

      esp_err_t err = handler->hide_keyboard_();
      if (err != ESP_OK) {
        ESP_LOGE(TAG, "Failed to hide keyboard: %s", esp_err_to_name(err));
      }
    }
  , LV_EVENT_DEFOCUSED, this);

  return ESP_OK;
}

//
// Private methods
//

void InteractionHandler::on_keyboard_event_(lv_event_t* e) {
  lv_event_code_t code = lv_event_get_code(e);
  if (code == LV_EVENT_READY || code == LV_EVENT_CANCEL) {
    // Keyboard is cancelled
    esp_err_t err = hide_keyboard_();
    if (err != ESP_OK) {
      ESP_LOGE(TAG, "Failed to hide keyboard: %s", esp_err_to_name(err));
    }

    if (focused_textarea_) {
      lv_obj_clear_state(focused_textarea_, LV_STATE_FOCUSED);
      lv_keyboard_set_textarea(keyboard_, nullptr);
      focused_textarea_ = nullptr;
    }
  }
}

esp_err_t InteractionHandler::show_keyboard_for_textarea_(lv_obj_t* textarea) {
  if (!keyboard_ || !textarea) {
    ESP_LOGE(TAG, "Invalid state or argument in show_keyboard_for_textarea_");
    return ESP_ERR_INVALID_ARG;
  }

  focused_textarea_ = textarea;
  lv_keyboard_set_textarea(keyboard_, textarea);
  lv_obj_clear_flag(keyboard_, LV_OBJ_FLAG_HIDDEN);
  // emit keyboard shown event
  KeyboardEventData event_data = {
   .textarea = textarea
  };
  esp_err_t err = esp_event_post_to(
    NULL,
    UI_EVENT_BASE,
    UI_EVENT_KEYBOARD_SHOWN,
    &event_data,
    sizeof(event_data),
    portMAX_DELAY
  );

  if (err != ESP_OK) {
    ESP_LOGE(TAG, "Failed to post keyboard shown event: %s", esp_err_to_name(err));
  }

  return ESP_OK;
}

esp_err_t InteractionHandler::hide_keyboard_(void) {
  if (!keyboard_) {
    return ESP_ERR_INVALID_STATE;
  }

  lv_obj_add_flag(keyboard_, LV_OBJ_FLAG_HIDDEN);

  // emit keyboard hidden event
  KeyboardEventData event_data = {
   .textarea = nullptr
  };

  esp_err_t err = esp_event_post_to(
    NULL,
    UI_EVENT_BASE,
    UI_EVENT_KEYBOARD_HIDDEN,
    &event_data,
    sizeof(event_data),
    portMAX_DELAY
  );

  if (err != ESP_OK) {
    ESP_LOGE(TAG, "Failed to post keyboard hidden event: %s", esp_err_to_name(err));
  }

  return ESP_OK;
}