为ExtJS 4 系列树添加可将节点拖动到叶子节点上的功能，可配置。
使用方法：将以下代码复制，新建立一js文件后，将其引用在ext核心js后即可。
使用时，通过allowLeafInserts属性进行叶子节点是否可拖动的配置，默认值为true。
啊啊啊啊…………又通宵了……
1 /*以下改动为是：给树添加允许为叶子节点添加子节点功能 --by lihong 2012/2/24
2 通过TreeViewDragDrop的allowLeafInserts为true或false进行配置
3 例：
4 // Ext.define('myTree', {
5 // extend: 'Ext.tree.Panel',
6 // viewConfig: {
7 // plugins: {
8 // ptype: 'treeviewdragdrop',
9 // allowLeafInserts : true
10 // }
11 // }
12 // }
13 //*/
14 Ext.override(Ext.tree.ViewDropZone, {
15 getPosition: function (e, node) {
16 var view = this.view,
17 record = view.getRecord(node),
18 y = e.getPageY(),
19 noAppend = record.isLeaf(),
20 noBelow = false,
21 region = Ext.fly(node).getRegion(),
22 fragment;
23
24 if (record.isRoot()) {
25 return 'append';
26 }
27
28 if (this.appendOnly) {
29 return noAppend ? false : 'append';
30 }
31 if (!this.allowParentInsert) {
32 //leehom modify begin
33 noBelow = this.allowLeafInserts || (record.hasChildNodes() && record.isExpanded());
34 //leehom modify end
35 }
36
37 fragment = (region.bottom - region.top) / (noAppend ? 2 : 3);
38 if (y >= region.top && y < (region.top + fragment)) {
39 return 'before';
40 }
41 else if (!noBelow && (noAppend || (y >= (region.bottom - fragment) && y <= region.bottom))) {
42 return 'after';
43 }
44 else {
45 return 'append';
46 }
47 },
48 handleNodeDrop: function (data, targetNode, position) {
49 var me = this,
50 view = me.view,
51 parentNode = targetNode.parentNode,
52 store = view.getStore(),
53 recordDomNodes = [],
54 records, i, len,
55 insertionMethod, argList,
56 needTargetExpand,
57 transferData,
58 processDrop;
59 if (data.copy) {
60 records = data.records;
61 data.records = [];
62 for (i = 0, len = records.length; i < len; i++) {
63 data.records.push(Ext.apply({}, records[i].data));
64 }
65 }
66 me.cancelExpand();
67 if (position == 'before') {
68 insertionMethod = parentNode.insertBefore;
69 argList = [null, targetNode];
70 targetNode = parentNode;
71 }
72 else if (position == 'after') {
73 if (targetNode.nextSibling) {
74 insertionMethod = parentNode.insertBefore;
75 argList = [null, targetNode.nextSibling];
76 }
77 else {
78 insertionMethod = parentNode.appendChild;
79 argList = [null];
80 }
81 targetNode = parentNode;
82 }
83 else {
84 //leehom add begin
85 if (this.allowLeafInserts) {
86 if (targetNode.get('leaf')) {
87 targetNode.set('leaf', false);
88 targetNode.set('expanded', true);
89 }
90 }
91 //leehom add end
92 if (!targetNode.isExpanded()) {
93 needTargetExpand = true;
94 }
95 insertionMethod = targetNode.appendChild;
96 argList = [null];
97 }
98
99 transferData = function () {
100 var node;
101 for (i = 0, len = data.records.length; i < len; i++) {
102 argList[0] = data.records[i];
103 node = insertionMethod.apply(targetNode, argList);
104
105 if (Ext.enableFx && me.dropHighlight) {
106 recordDomNodes.push(view.getNode(node));
107 }
108 }
109 if (Ext.enableFx && me.dropHighlight) {
110 Ext.Array.forEach(recordDomNodes, function (n) {
111 if (n) {
112 Ext.fly(n.firstChild ? n.firstChild : n).highlight(me.dropHighlightColor);
113 }
114 });
115 }
116 };
117 if (needTargetExpand) {
118 targetNode.expand(false, transferData);
119 }
120 else {
121 transferData();
122 }
123 }
124 });
125
126
127 Ext.override(Ext.tree.plugin.TreeViewDragDrop, {
128 allowLeafInserts: true,
129
130 onViewRender: function (view) {
131 var me = this;
132 if (me.enableDrag) {
133 me.dragZone = Ext.create('Ext.tree.ViewDragZone', {
134 view: view,
135 allowLeafInserts: me.allowLeafInserts,
136 ddGroup: me.dragGroup || me.ddGroup,
137 dragText: me.dragText,
138 repairHighlightColor: me.nodeHighlightColor,
139 repairHighlight: me.nodeHighlightOnRepair
140 });
141 }
142
143 if (me.enableDrop) {
144 me.dropZone = Ext.create('Ext.tree.ViewDropZone', {
145 view: view,
146 ddGroup: me.dropGroup || me.ddGroup,
147 allowContainerDrops: me.allowContainerDrops,
148 appendOnly: me.appendOnly,
149 allowLeafInserts: me.allowLeafInserts,
150 allowParentInserts: me.allowParentInserts,
151 expandDelay: me.expandDelay,
152 dropHighlightColor: me.nodeHighlightColor,
153 dropHighlight: me.nodeHighlightOnDrop
154 });
155 }
156 }
157 });
158 ////////////////树叶子节点改动结束//////////////////////////////////////////////////////////
2 通过TreeViewDragDrop的allowLeafInserts为true或false进行配置
3 例：
4 // Ext.define('myTree', {
5 // extend: 'Ext.tree.Panel',
6 // viewConfig: {
7 // plugins: {
8 // ptype: 'treeviewdragdrop',
9 // allowLeafInserts : true
10 // }
11 // }
12 // }
13 //*/
14 Ext.override(Ext.tree.ViewDropZone, {
15 getPosition: function (e, node) {
16 var view = this.view,
17 record = view.getRecord(node),
18 y = e.getPageY(),
19 noAppend = record.isLeaf(),
20 noBelow = false,
21 region = Ext.fly(node).getRegion(),
22 fragment;
23
24 if (record.isRoot()) {
25 return 'append';
26 }
27
28 if (this.appendOnly) {
29 return noAppend ? false : 'append';
30 }
31 if (!this.allowParentInsert) {
32 //leehom modify begin
33 noBelow = this.allowLeafInserts || (record.hasChildNodes() && record.isExpanded());
34 //leehom modify end
35 }
36
37 fragment = (region.bottom - region.top) / (noAppend ? 2 : 3);
38 if (y >= region.top && y < (region.top + fragment)) {
39 return 'before';
40 }
41 else if (!noBelow && (noAppend || (y >= (region.bottom - fragment) && y <= region.bottom))) {
42 return 'after';
43 }
44 else {
45 return 'append';
46 }
47 },
48 handleNodeDrop: function (data, targetNode, position) {
49 var me = this,
50 view = me.view,
51 parentNode = targetNode.parentNode,
52 store = view.getStore(),
53 recordDomNodes = [],
54 records, i, len,
55 insertionMethod, argList,
56 needTargetExpand,
57 transferData,
58 processDrop;
59 if (data.copy) {
60 records = data.records;
61 data.records = [];
62 for (i = 0, len = records.length; i < len; i++) {
63 data.records.push(Ext.apply({}, records[i].data));
64 }
65 }
66 me.cancelExpand();
67 if (position == 'before') {
68 insertionMethod = parentNode.insertBefore;
69 argList = [null, targetNode];
70 targetNode = parentNode;
71 }
72 else if (position == 'after') {
73 if (targetNode.nextSibling) {
74 insertionMethod = parentNode.insertBefore;
75 argList = [null, targetNode.nextSibling];
76 }
77 else {
78 insertionMethod = parentNode.appendChild;
79 argList = [null];
80 }
81 targetNode = parentNode;
82 }
83 else {
84 //leehom add begin
85 if (this.allowLeafInserts) {
86 if (targetNode.get('leaf')) {
87 targetNode.set('leaf', false);
88 targetNode.set('expanded', true);
89 }
90 }
91 //leehom add end
92 if (!targetNode.isExpanded()) {
93 needTargetExpand = true;
94 }
95 insertionMethod = targetNode.appendChild;
96 argList = [null];
97 }
98
99 transferData = function () {
100 var node;
101 for (i = 0, len = data.records.length; i < len; i++) {
102 argList[0] = data.records[i];
103 node = insertionMethod.apply(targetNode, argList);
104
105 if (Ext.enableFx && me.dropHighlight) {
106 recordDomNodes.push(view.getNode(node));
107 }
108 }
109 if (Ext.enableFx && me.dropHighlight) {
110 Ext.Array.forEach(recordDomNodes, function (n) {
111 if (n) {
112 Ext.fly(n.firstChild ? n.firstChild : n).highlight(me.dropHighlightColor);
113 }
114 });
115 }
116 };
117 if (needTargetExpand) {
118 targetNode.expand(false, transferData);
119 }
120 else {
121 transferData();
122 }
123 }
124 });
125
126
127 Ext.override(Ext.tree.plugin.TreeViewDragDrop, {
128 allowLeafInserts: true,
129
130 onViewRender: function (view) {
131 var me = this;
132 if (me.enableDrag) {
133 me.dragZone = Ext.create('Ext.tree.ViewDragZone', {
134 view: view,
135 allowLeafInserts: me.allowLeafInserts,
136 ddGroup: me.dragGroup || me.ddGroup,
137 dragText: me.dragText,
138 repairHighlightColor: me.nodeHighlightColor,
139 repairHighlight: me.nodeHighlightOnRepair
140 });
141 }
142
143 if (me.enableDrop) {
144 me.dropZone = Ext.create('Ext.tree.ViewDropZone', {
145 view: view,
146 ddGroup: me.dropGroup || me.ddGroup,
147 allowContainerDrops: me.allowContainerDrops,
148 appendOnly: me.appendOnly,
149 allowLeafInserts: me.allowLeafInserts,
150 allowParentInserts: me.allowParentInserts,
151 expandDelay: me.expandDelay,
152 dropHighlightColor: me.nodeHighlightColor,
153 dropHighlight: me.nodeHighlightOnDrop
154 });
155 }
156 }
157 });
158 ////////////////树叶子节点改动结束//////////////////////////////////////////////////////////