<?php
/**
 * Created by PhpStorm.
 * User: NullFeng
 * Date: 2017年12月25日
 * Time: 10:41
 */

namespace app\admin\traits;

use think\Config;
use think\Controller;
use think\Request;
use utils\ListModel;

/**
 * Trait ListViewBuilder
 * @package app\admin\traits
 * 通用列表视图
 */
trait ListViewBuilder
{
 /**
 * 列表数据模型
 */
 protected $list_model;

 /**
 * 分页信息
 */
 protected $page_info = [
 'no' => 0, //当前页码
 'count' => 0, //总页数
 'total' => 0, //总记录数
 'size' => 10, //单页显示记录数
 ];
 /**
 * 当前查询条件数组
 */
 protected $query_condition = [];
 /**
 * 搜索字段配置
 */
 protected $search_config = [];

 /**
 * 创建列表模型
 * @return ListModel
 */
 public function createListModel()
 {
 $this->list_model = new ListModel();
 return $this->list_model;
 }

 /**
 * 生成数据
 * @return array
 */
 public function fetchRows()
 {
 if (!$this->list_model)
 return [];
 return $this->list_model->fetchRows();
 }

 /**
 * 获取头部
 * @return array
 */
 public function fetchHeaders()
 {
 if (!$this->list_model)
 return [];
 return $this->list_model->getHeaders();
 }

 /**
 * 添加搜索字段(在获取数据之前调用)
 * @param $name 对应数据库里面的字段
 * @param $option array(
 * 'title'=>'显示标题',
 * 'type'=>'搜索类型:text|select|date',
 * 'method'=>'搜索方式:equals|contain',
 * 'placeholder'=>'类型为text时生效:string'
 * 'list'=>'类型为select时生效:array'
 * )
 * @return $this
 */
 public function addSearchField($name, $option)
 {
 $this->search_config[$name] = $option;
 return $this;
 }

 /**
 * 接收表单提交(必须放置于添加搜索字段之后)
 */
 public function receivePost()
 {
 if ($this instanceof Controller && Request::instance()->isPost()) {
 $data = input('post.');
 $query_fields = isset($data['_query']) ? $data['_query'] : [];//取出要查询的字段
 if (!empty($query_fields)) {
 $config = $this->search_config;//读取所有字段的查询方式
 foreach ($query_fields as $key => $field) {//遍历要查询的字段
 if (isset($config[$key])) {//如果要查询的字段在配置里面
 if ($field === '_no_select_') {//如果值等于_no_select_则表示选择的是下拉框中的"全部"
 $query_fields[$key] = 98765675;
 continue;
 }
 if (strlen($field . '') == 0) {//要查询的值为空串
 continue;
 }
 $config_filed = $config[$key];
 switch ($config_filed['method']) {
 case 'contain':
 $this->query_condition[$key] = array('like', '%' . $field . '%');
 break;

 case 'equals':
 default:
 $this->query_condition[$key] = $field;
 break;
 }
 }
 }
 }
 $this->assign('_query_fields', $query_fields);
 }
 }

 /**
 * 获取当前查询条件
 */
 public function getQueryCondition()
 {
 return $this->query_condition;
 }

 /**
 * 配置分页
 */
 public function configPage($total, $size = 1)
 {
 if (!empty($total)) {
 $this->page_info['count'] = ceil($total / ($size * 1.0));
 $this->page_info['no'] = 1;
 $data = input('post.');//从提交过来的参数获取当前页码
 if (isset($data['_page_no'])) {
 $this->page_info['no'] = $data['_page_no'];
 }
 $this->page_info['total'] = $total;
 $this->page_info['size'] = $size;
 }
 }

 /**
 * 获取当前页码
 * @return mixed
 */
 public function getCurrentPageNo()
 {
 return $this->page_info['no'];
 }

 /**
 * 获取单页显示数量
 * @return mixed
 */
 public function getPageSize()
 {
 return $this->page_info['size'];
 }

 /**
 * 渲染通用列表视图(页面需要手动选择list_view变量)
 * @param string $tpl
 * @return mixed|string
 */
 public function fetchListView($tpl = ':common_list')
 {
 if ($this instanceof Controller) {
 $this->assign('_headers', $this->fetchHeaders());
 $this->assign('_rows', $this->fetchRows());
 $this->assign('_search', $this->search_config);
 $this->assign('_page', $this->page_info);
 $this->view->engine->layout(false);
 $list_view = $this->fetch($tpl);
 $this->view->engine->layout(true);
 $this->assign('list_view', $list_view);
 return $this->fetch();
 }
 return '只能在控制器中使用!!!';
 }
}