7820380e
 “wangming”
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import { arrayFind } from 'element-ui/src/utils/util';
import { getRowIdentity } from '../util';
export default {
data() {
return {
states: {
// 不可响应的，设置 currentRowKey 时，data 不一定存在，也许无法算出正确的 currentRow
// 把该值缓存一下，当用户点击修改 currentRow 时，把该值重置为 null
_currentRowKey: null,
currentRow: null
}
};
},
methods: {
setCurrentRowKey(key) {
this.assertRowKey();
this.states._currentRowKey = key;
this.setCurrentRowByKey(key);
},
restoreCurrentRowKey() {
this.states._currentRowKey = null;
},
setCurrentRowByKey(key) {
const { states } = this;
const { data = [], rowKey } = states;
let currentRow = null;
if (rowKey) {
currentRow = arrayFind(data, item => getRowIdentity(item, rowKey) === key);
}
states.currentRow = currentRow;
},
updateCurrentRow(currentRow) {
const { states, table } = this;
const oldCurrentRow = states.currentRow;
if (currentRow && currentRow !== oldCurrentRow) {
states.currentRow = currentRow;
table.$emit('current-change', currentRow, oldCurrentRow);
return;
}
if (!currentRow && oldCurrentRow) {
states.currentRow = null;
table.$emit('current-change', null, oldCurrentRow);
}
},
updateCurrentRowData() {
const { states, table } = this;
const { rowKey, _currentRowKey } = states;
// data 为 null 时，解构时的默认值会被忽略
const data = states.data || [];
const oldCurrentRow = states.currentRow;
// 当 currentRow 不在 data 中时尝试更新数据
if (data.indexOf(oldCurrentRow) === -1 && oldCurrentRow) {
if (rowKey) {
const currentRowKey = getRowIdentity(oldCurrentRow, rowKey);
this.setCurrentRowByKey(currentRowKey);
} else {
states.currentRow = null;
}
if (states.currentRow === null) {
table.$emit('current-change', null, oldCurrentRow);
}
} else if (_currentRowKey) {
// 把初始时下设置的 rowKey 转化成 rowData
this.setCurrentRowByKey(_currentRowKey);
this.restoreCurrentRowKey();
}
}
}
};
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