拖动问题修复

src/module/hand.js

@@ -21,18 +21,19 @@ var ViewDragger = kity.createClass( "ViewDragger", {
     _bind: function () {
         var dragger = this,
             isRootDrag = false,
-            startPosition = null,
-            lastPosition = null;
+            lastPosition = null,
+            currentPosition = null;
 
         this._minder.on( 'beforemousedown', function ( e ) {
             // 已经被用户打开拖放模式
             if ( dragger.isEnabled() ) {
-                startPosition = e.getPosition();
+                lastPosition = e.getPosition();
                 e.stopPropagation();
             }
             // 点击未选中的根节点临时开启
-            else if ( !this.getRoot().isSelected() && e.getTargetNode() == this.getRoot() ) {
-                startPosition = e.getPosition();
+            else if ( e.getTargetNode() == this.getRoot() &&
+                (!this.getRoot().isSelected() || !this.isSingleSelect())) {
+                lastPosition = e.getPosition();
                 dragger.setEnabled( true );
                 isRootDrag = true;
             }
@@ -40,25 +41,20 @@ var ViewDragger = kity.createClass( "ViewDragger", {
         } )
 
         .on( 'beforemousemove', function ( e ) {
-            if ( startPosition ) {
-                lastPosition = e.getPosition();
+            if ( lastPosition ) {
+                currentPosition = e.getPosition();
 
                 // 当前偏移加上历史偏移
-                var offset = kity.Vector.fromPoints( startPosition, lastPosition );
-                offset = kity.Vector.add( dragger._offset, offset );
+                var offset = kity.Vector.fromPoints( lastPosition, currentPosition );
 
-                this.getRenderContainer().setTransform( new kity.Matrix().translate( offset.x, offset.y ) );
+                this.getRenderContainer().translate( offset.x, offset.y );
                 e.stopPropagation();
+                lastPosition = currentPosition;
             }
         } )
 
         .on( 'mouseup', function ( e ) {
-            if ( startPosition && lastPosition ) {
-                // 合并更改的偏移到历史偏移
-                dragger._offset.x += lastPosition.x - startPosition.x;
-                dragger._offset.y += lastPosition.y - startPosition.y;
-            }
-            startPosition = null;
+            lastPosition = null;
 
             // 临时拖动需要还原状态
             if ( isRootDrag ) {