tree.vue
7.36 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
<template>
<div :class="prefixCls">
<Tree-node
v-for="(item, i) in stateTree"
:key="i"
:data="item"
visible
:multiple="multiple"
:show-checkbox="showCheckbox"
:children-key="childrenKey">
</Tree-node>
<div :class="[prefixCls + '-empty']" v-if="!stateTree.length">{{ localeEmptyText }}</div>
</div>
</template>
<script>
import TreeNode from './node.vue';
import Emitter from '../../mixins/emitter';
import Locale from '../../mixins/locale';
const prefixCls = 'ivu-tree';
export default {
name: 'Tree',
mixins: [ Emitter, Locale ],
components: { TreeNode },
props: {
data: {
type: Array,
default () {
return [];
}
},
multiple: {
type: Boolean,
default: false
},
showCheckbox: {
type: Boolean,
default: false
},
checkStrictly:{
type:Boolean,
default:false
},
emptyText: {
type: String
},
childrenKey: {
type: String,
default: 'children'
},
loadData: {
type: Function
},
render: {
type: Function
}
},
data () {
return {
prefixCls: prefixCls,
stateTree: this.data,
flatState: [],
};
},
watch: {
data: {
deep: true,
handler () {
this.stateTree = this.data;
this.flatState = this.compileFlatState();
this.rebuildTree();
}
}
},
computed: {
localeEmptyText () {
if (typeof this.emptyText === 'undefined') {
return this.t('i.tree.emptyText');
} else {
return this.emptyText;
}
},
},
methods: {
compileFlatState () { // so we have always a relation parent/children of each node
let keyCounter = 0;
let childrenKey = this.childrenKey;
const flatTree = [];
function flattenChildren(node, parent) {
node.nodeKey = keyCounter++;
flatTree[node.nodeKey] = { node: node, nodeKey: node.nodeKey };
if (typeof parent != 'undefined') {
flatTree[node.nodeKey].parent = parent.nodeKey;
flatTree[parent.nodeKey][childrenKey].push(node.nodeKey);
}
if (node[childrenKey]) {
flatTree[node.nodeKey][childrenKey] = [];
node[childrenKey].forEach(child => flattenChildren(child, node));
}
}
this.stateTree.forEach(rootNode => {
flattenChildren(rootNode);
});
return flatTree;
},
updateTreeUp(nodeKey){
const parentKey = this.flatState[nodeKey].parent;
if (typeof parentKey == 'undefined' || this.checkStrictly) return;
const node = this.flatState[nodeKey].node;
const parent = this.flatState[parentKey].node;
if (node.checked == parent.checked && node.indeterminate == parent.indeterminate) return; // no need to update upwards
if (node.checked == true) {
this.$set(parent, 'checked', parent[this.childrenKey].every(node => node.checked));
this.$set(parent, 'indeterminate', !parent.checked);
} else {
this.$set(parent, 'checked', false);
this.$set(parent, 'indeterminate', parent[this.childrenKey].some(node => node.checked || node.indeterminate));
}
this.updateTreeUp(parentKey);
},
rebuildTree () { // only called when `data` prop changes
const checkedNodes = this.getCheckedNodes();
checkedNodes.forEach(node => {
this.updateTreeDown(node, {checked: true});
// propagate upwards
const parentKey = this.flatState[node.nodeKey].parent;
if (!parentKey && parentKey !== 0) return;
const parent = this.flatState[parentKey].node;
const childHasCheckSetter = typeof node.checked != 'undefined' && node.checked;
if (childHasCheckSetter && parent.checked != node.checked) {
this.updateTreeUp(node.nodeKey); // update tree upwards
}
});
},
getSelectedNodes () {
/* public API */
return this.flatState.filter(obj => obj.node.selected).map(obj => obj.node);
},
getCheckedNodes () {
/* public API */
return this.flatState.filter(obj => obj.node.checked).map(obj => obj.node);
},
getCheckedAndIndeterminateNodes () {
/* public API */
return this.flatState.filter(obj => (obj.node.checked || obj.node.indeterminate)).map(obj => obj.node);
},
updateTreeDown(node, changes = {}) {
if (this.checkStrictly) return;
for (let key in changes) {
this.$set(node, key, changes[key]);
}
if (node[this.childrenKey]) {
node[this.childrenKey].forEach(child => {
this.updateTreeDown(child, changes);
});
}
},
handleSelect (nodeKey) {
const node = this.flatState[nodeKey].node;
if (!this.multiple){ // reset previously selected node
const currentSelectedKey = this.flatState.findIndex(obj => obj.node.selected);
if (currentSelectedKey >= 0 && currentSelectedKey !== nodeKey) this.$set(this.flatState[currentSelectedKey].node, 'selected', false);
}
this.$set(node, 'selected', !node.selected);
this.$emit('on-select-change', this.getSelectedNodes(), node);
},
handleCheck({ checked, nodeKey }) {
const node = this.flatState[nodeKey].node;
this.$set(node, 'checked', checked);
this.$set(node, 'indeterminate', false);
this.updateTreeUp(nodeKey); // propagate up
this.updateTreeDown(node, {checked, indeterminate: false}); // reset `indeterminate` when going down
this.$emit('on-check-change', this.getCheckedNodes(), node);
}
},
created(){
this.flatState = this.compileFlatState();
this.rebuildTree();
},
mounted () {
this.$on('on-check', this.handleCheck);
this.$on('on-selected', this.handleSelect);
this.$on('toggle-expand', node => this.$emit('on-toggle-expand', node));
}
};
</script>