改写yii2的listview功能

在vendor\yiisoft\yii2\widgets路径下新增文件ListViewtest,将下列代码粘贴并保存

<?php

namespace yii\widgets;

use Yii;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;

class ListViewtest extends ListView
{
/**
* Renders a single data model.
* @param mixed $model the data model to be rendered
* @param mixed $key the key value associated with the data model
* @param integer $index the zero-based index of the data model in the model array returned by dataProvider.
* @return string the rendering result
*/

public $options = [];//列表外侧的div,可有属性class,id 等
public $num;//计数器
public $itemView_top;//前面几个模板
public $real_itemView;//后面的后续模板
public $num_top;//使用前模板的个数
public $start_num;//起始数值
public $div_allowed;//是否允许用div框住
public $extra;
public $front_moban;

//构析函数,注销变量
public function __destruct() {
  global $options;
  global $num;
  global $itemView_top;
  global $real_itemView;
  global $num_top;
  global $start_num;
  global $front_tag;

  $options = [];
  $num = 0;
  $itemView_top = null;
  $real_itemView = null;
  $num_top = null;
  $start_num = null;
  $front_tag =null;
}

public function run()
{
  if ($this->showOnEmpty || $this->dataProvider->getCount() > 0) {
    $content = preg_replace_callback("/{\\w+}/", function ($matches) {

      $content = $this->renderSection($matches[0]);

      return $content === false ? $matches[0] : $content;
    }, $this->layout);

  } else {
    $content = $this->renderEmpty();
  }

  if ($this->div_allowed === true) {
    $options = $this->options;
    $tag = ArrayHelper::remove($options, 'tag', 'div');
    echo Html::tag($tag, $content, $options);
  }else{
    echo $content;
  }

}

public function renderItems()
{

  global $options;
  global $num;
  global $itemView_top;
  global $real_itemView;
  global $num_top;

  //给初始计数赋值
  $this->start_num = isset($this->start_num)?$this->start_num:0;
  $num = $this->start_num;

  //若只用一套模板,则上下两套模板一致
  if (!isset($this->itemView_top)) {
    $this->itemView_top = $this->itemView;
  }

  $back_tag = $this->front_moban['flag']===true?$this->front_moban['tag_back']:null;

  $models = $this->dataProvider->getModels();
  $keys = $this->dataProvider->getKeys();
  $rows = [];
  foreach (array_values($models) as $index => $model) {
    $rows[] = $this->renderItem($model, $keys[$index], $index);
  }

  return implode($this->separator, $rows).$back_tag;
}

public function renderItem($model, $key, $index)
{
  global $num;//计数
  //global $itemView_top;//储存模板
  global $num_top;
  global $real_itemView;
  global $front_tag;

  if ($num==$this->start_num) {

    $real_itemView = $this->itemView;//暂存模板
    $this->itemView = $this->itemView_top;//赋予新模板
    $front_tag = '';

  }elseif($num == ($this->start_num+$this->num_top)){

    $this->itemView = $real_itemView;//调用原模板
    $front_tag = $this->front_moban['flag'] === true?$this->front_moban['tag_front']:'';

  }elseif($num>($this->start_num+$this->num_top)){

    $this->itemView = $real_itemView;//调用原模板
    $front_tag = '';

  }

  if ($this->itemView === null) {
    $content = $key;
  } elseif (is_string($this->itemView)) {
    $content = $this->getView()->render($this->itemView, array_merge([
      'model' => $model,
      'key' => $key,
      'index' => $index,
      'widget' => $this,
    ], $this->viewParams));
  } else {
    $content = call_user_func($this->itemView, $model, $key, $index, $this);
  }

  $options = $this->itemOptions;

  $tag = ArrayHelper::remove($options, 'tag', 'li');

  $num++;

  if ($this->extra['flag'] === true) {
    if (($num-$this->start_num)%$this->extra['num'] == 0) {
      return $front_tag.str_replace('{num}', ($num<10?'0'.$num:$num), $content).$this->extra['tag'];
    }else{
      return $front_tag.str_replace('{num}', ($num<10?'0'.$num:$num), $content);
    }  
  }else{
    return $front_tag.str_replace('{num}', ($num<10?'0'.$num:$num), $content);
  }




// }
}
}

在视图模板中调用这个ListViewtest

<?php
use yii\widgets\ListViewtest;
?>

<?=ListViewtest::widget([

  'layout' => "{items}\n{pager}",
  'dataProvider' => $dataProvider,
  'itemView' => '_test',//子视图
  'itemView_top' => '_test1',//top模板
  'num_top' => 1,//使用top模板的数目
  'start_num' => 10,//从第几开始计数?默认0

  //调用原模板(itemView模板,非itemView_top模板)时前后包夹标签
  'front_moban' => [
    'flag' => true,        //开关,默认关
    'tag_front' => '<front>',   //前标签
    'tag_back' => '</front>',   //后标签 
  ],

  //每打印多少条数据的末尾,出现一次html标签
  'extra' => [
    'flag' => false,   //开关,默认关
    'tag' => '<hr>',  //该标签
    'num' => 5,     //条数
  ]

  //是否允许用div框住,默认否

  'div_allowed' => true,

  'options' => [  //该div的属性
    'class' => null,
    'id' => 'eee',
  ]

]);?>

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