Ext.define('ux.plugin.ColumnCustom', {
  alias: 'plugin.columnCustom',
  xtype: 'columnCustom',
  //初始化
  init: function (gridPanel) {
    var me = this;
    me.owner = gridPanel;
    //根据已有配置项设置表头状态
    me.setColumnConfig(gridPanel);
    gridPanel.on({
      columnschanged: me.saveColumnConfig,
      scope: me
    });
  },
  setColumnConfig: function (gridPanel) {
    var me = this,
      xtype = gridPanel.getXType(),
      currentColumnConfig = me.getCurrentColumnConfig(),
      columnConfig = currentColumnConfig[xtype],
      columns = gridPanel.getColumns();
    if (!columnConfig) return;
    columns.forEach(function (column) {
      var dataIndex = column.config.dataIndex;
      //只有常规列才有显式的dataIndex，序号列等非常规列应排除在外
      if (!dataIndex) return;
      column.setHidden(columnConfig[dataIndex]);
    });
  },
  saveColumnConfig: function () {
    var me = this,
      gridPanel = me.owner,
      currentColumnConfig = me.getCurrentColumnConfig(),
      columns = gridPanel.getColumns(),
      xtype = gridPanel.getXType(),
      config = {};
    columns.forEach(function (column) {
      var dataIndex = column.config.dataIndex;
      //只有常规列才有显式的dataIndex，序号列等非常规列应排除在外
      if (!dataIndex) return;
      config[dataIndex] = column.isHidden();
    });
    //使用xtype作为索引是相对可靠的做法
    currentColumnConfig[xtype] = config;
    //localStorage的值类型限定为string类型
    localStorage.setItem('columnConfig', Ext.encode(currentColumnConfig));
  },
  getCurrentColumnConfig: function () {
    var allColumnConfigString = localStorage.getItem('columnConfig'),
      allColumnConfig = Ext.decode(allColumnConfigString, true);
    return allColumnConfig || {};
  }
});

Ext.define('override.grid.Panel', {
  override: 'Ext.grid.Panel',
  requires: ['ux.plugin.ColumnCustom'],
  columnCustomDisable: false,
  initComponent: function () {
    var me = this;
    me.callParent();
    //默认全部加上自动保存表头插件,此处追加一个可配属性来禁用此插件
    if (!me.columnCustomDisable) {
      me.addPlugin('columnCustom');
    }
  }
});