优化鼠标在节点外部时，选区依旧生效

src/module/editor.js

@@ -16,6 +16,8 @@ KityMinder.registerModule('TextEditModule', function() {
     //当前是否有选区存在
     var selectionReadyShow = false;
 
+    var mousedownNode;
+
     function inputStatusReady(node){
         if (node && km.isSingleSelect() && node.isSelected()) {
 
@@ -91,6 +93,8 @@ KityMinder.registerModule('TextEditModule', function() {
                 if(node){
 
                     if (this.isSingleSelect() && node.isSelected()) {
+                        mousedownNode = node;
+
                         var textGroup = node.getTextGroup();
 
                         textGroup.setStyle('cursor', 'default');
@@ -158,6 +162,7 @@ KityMinder.registerModule('TextEditModule', function() {
 
                 var node = e.getTargetNode();
 
+                mousedownNode = null;
 
                 if (node && !selectionReadyShow && receiver.isReady()) {
 
@@ -208,11 +213,13 @@ KityMinder.registerModule('TextEditModule', function() {
                 }
                 //ipad下不做框选
                 if (mouseDownStatus && receiver.isReady() && selectionReadyShow) {
+
                     var node = e.getTargetNode();
                     e.stopPropagationImmediately();
 
-                    if(node){
-                        var offset = e.getPosition(node.getRenderContainer());
+                    if(node || mousedownNode){
+
+                        var offset = e.getPosition(node ? node.getRenderContainer() : mousedownNode.getRenderContainer());
 
                         receiver
                             .updateSelectionByMousePosition(offset)

src/module/editor.receiver.js

@@ -220,7 +220,7 @@ Minder.Receiver = kity.createClass('Receiver', {
         this.selection.setHeight((this.minderNode.getData('font-size') || this.minderNode.getStyle('font-size')) * 1);
         return this;
     },
-    updateSelectionByMousePosition: function(offset,dir) {
+    updateSelectionByMousePosition: function(offset) {
 
         var me = this;
         var result = 0;
@@ -240,7 +240,6 @@ Minder.Receiver = kity.createClass('Receiver', {
 
                         result += i;
                         if (offset.x - v.x > v.width / 2) {
-
                             result += 1;
                         }
 
@@ -257,6 +256,13 @@ Minder.Receiver = kity.createClass('Receiver', {
                 return false;
             }else{
 
+                if(first.y > offset.y && l === 0){
+                    result = 0;
+                    return false;
+                }else if(l == me.textData.length - 1 && first.y  + lineHeight < offset.y){
+                    result += arr.length + 1;
+                    return false;
+                }
                 result += arr.length + (arr.length == 1 && arr[0].width === 0 ? 0 : 1);
                 return;
             }