flex datagrid tab键不好用的有关问题

flex datagrid tab键不好用的问题
状况：
  比如：datagrid 绑定的数据源有四行数据，其中第二行为不可编辑（用event.stopImmediatePropagation()或dg1.editedItemPosition=null） ，在这种情况下，tab只能在第一行好用，继续按tab会跳出去，然后，按够列数次tab键后，光标才有可能跳到第三行。
  我想，直接按一次tab就跳过不可编辑的行到下一行，怎么解决呢？？

[解决办法]
给你参考这个。

XML code

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"                layout="absolute"                height="700"                verticalScrollPolicy="on" creationComplete="init()">    <mx:Script>        <![CDATA[            import mx.controls.ComboBox;            import mx.controls.Alert;            import mx.events.*;            import mx.events.AdvancedDataGridEvent;            import mx.collections.ArrayCollection;            import mx.controls.dataGridClasses.DataGridColumn;            [Bindable]            private var data1:ArrayCollection=new ArrayCollection([{xh: 1}, {xh: 2}, {xh: 3}, {xh: 4}, {xh: 5}, {xh: 6}]);                        private function init():void            {                dg1.addEventListener(FocusEvent.KEY_FOCUS_CHANGE,keyFocusChangeHandler);            }            private function itemEditBeginHandler(event:AdvancedDataGridEvent):void            {                var rowIndex:int=event.rowIndex;                var colIndex:int=event.columnIndex;                var record:Object=data1.getItemAt(rowIndex);                if (colIndex == 2)                {                    event.stopImmediatePropagation();                }            }            private function keydownDataGrid(event:KeyboardEvent):void            {                try{                    var position:Object = dg1.editedItemPosition;                    var offsetRow:int = 0;                    var offsetCol:int = 0;                    //tab                     if(event.keyCode == Keyboard.TAB){                        if (event.shiftKey) {                            offsetCol = -1;                        } else {                             offsetCol = 1;                        }                    } else if (event.keyCode == Keyboard.UP){                        offsetRow = -1;                    } else if (event.keyCode == Keyboard.DOWN){                        offsetRow = 1;                    } else if (event.keyCode == Keyboard.LEFT){                        offsetCol = -1;                    } else if (event.keyCode == Keyboard.RIGHT){                        offsetCol = 1;                    } else {                        return;                    }                    dg1.editedItemPosition = findNextEditableCell(position,offsetRow,offsetCol);                } catch(e:Error) {                    trace(e.message);                }            }              private function findNextEditableCell(v:Object,offsetRow:int=0,offsetCol:int=0):Object            {                if (v == null ||                     (offsetRow == 0 && offsetCol == 0) ||                    (offsetRow != 0 && offsetCol != 0)) {                    return null;                }                var loopCount:int = 0;                var dataEditable:Boolean = false;                while (!dataEditable && (loopCount < 2)) {                    if (offsetCol != 0) {                        if ((v.columnIndex + offsetCol) < dg1.columns.length &&                            (v.columnIndex + offsetCol) >= 0) {                             v.columnIndex = v.columnIndex + offsetCol;                        } else {                            if ((v.rowIndex + offsetCol) < dg1.dataProvider.length &&                                (v.rowIndex + offsetCol) >= 0) {                                                                v.rowIndex = v.rowIndex + offsetCol;                                if (offsetCol > 0) {                                    v.columnIndex = 0;                                } else {                                    v.columnIndex = dg1.columns.length -1;                                }                            } else {                                if (offsetCol > 0) {                                    v.columnIndex = 0;                                    v.rowIndex = 0;                                } else {                                    v.columnIndex = dg1.columns.length -1;                                    v.rowIndex = dg1.dataProvider.length -1;                                }                                loopCount ++;                            }                        }                    } else {                        if ((v.rowIndex + offsetRow) < dg1.dataProvider.length &&                            (v.rowIndex + offsetRow) >= 0) {                             v.rowIndex = v.rowIndex + offsetRow;                        } else {                            if (offsetRow > 0) {                                v.rowIndex = 0;                            } else {                                v.rowIndex = dg1.dataProvider.length -1;                            }                            loopCount ++;                        }                    }                    if (dg1.columns[v.columnIndex] != null &&                        dg1.columns[v.columnIndex].editable) {                                                if (v.columnIndex != 2) {                            dataEditable = true;                        } else {                            dataEditable = false;                        }                    }                }                return v;            }            private function keyFocusChangeHandler(event:FocusEvent):void            {                if (event.keyCode == Keyboard.TAB)                {                    event.preventDefault();                }            }        ]]>    </mx:Script>    <mx:Canvas verticalScrollBarStyleName="hh"               height="614"               width="831.5"               horizontalCenter="-1"               verticalCenter="0"               verticalScrollPolicy="auto">        <mx:AdvancedDataGrid id="dg1"                             designViewDataType="flat"                             sortExpertMode="true"                             sortableColumns="false"                             rowCount="5"                             dataProvider="{data1}"                             height="441"                             width="811.5"                             fontSize="14"                             fontFamily="Times New Roman"                             editable="true"                             enabled="true"                             x="10"                             y="55"                             itemEditBegin="itemEditBeginHandler(event)"                             keyDown="keydownDataGrid(event)">                                         <mx:groupedColumns>                <mx:AdvancedDataGridColumn headerText="序号"                                           dataField="xh"                                           width="150"                                           editable="false"/>                <mx:AdvancedDataGridColumn headerText="COLUMN1"                                           dataField="col1"                                           width="200"/>                <mx:AdvancedDataGridColumn headerText="COLUMN2"                                           dataField="col2"                                           width="200"/>                <mx:AdvancedDataGridColumn headerText="COLUMN3"                                           dataField="col3"                                           width="200"/>                <mx:AdvancedDataGridColumn headerText="COLUMN4"                                           dataField="col4"                                           width="200"/>                <mx:AdvancedDataGridColumn headerText="COLUMN5"                                           dataField="col5"                                           width="200"/>            </mx:groupedColumns>        </mx:AdvancedDataGrid>    </mx:Canvas></mx:Application> 
 
[解决办法]
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
               layout="absolute"
               height="700"
               verticalScrollPolicy="on" creationComplete="init()">
   <mx:Script>
       <![CDATA[
           import mx.controls.ComboBox;
           import mx.controls.Alert;
           import mx.events.*;
           import mx.events.AdvancedDataGridEvent;
           import mx.collections.ArrayCollection;
           import mx.controls.dataGridClasses.DataGridColumn;

           [Bindable]
           private var data1:ArrayCollection=new ArrayCollection([{xh: 1}, {xh: 2}, {xh: 3}, {xh: 4}, {xh: 5}, {xh: 6}]);
          
           private function init():void
           {
               dg1.addEventListener(FocusEvent.KEY_FOCUS_CHANGE,keyFocusChangeHandler);
           }

           private function itemEditBeginHandler(event:AdvancedDataGridEvent):void
           {
               var rowIndex:int=event.rowIndex;
               var colIndex:int=event.columnIndex;
               var record:Object=data1.getItemAt(rowIndex);

               if (colIndex == 2)
               {
                   event.stopImmediatePropagation();
               }

           }
           private function keydownDataGrid(event:KeyboardEvent):void
           {
               try{
                   var position:Object = dg1.editedItemPosition;
                   var offsetRow:int = 0;
                   var offsetCol:int = 0;
                   //tab  
                   if(event.keyCode == Keyboard.TAB){
                       if (event.shiftKey) {
                           offsetCol = -1;
                       } else {
                            offsetCol = 1;
                       }
                   } else if (event.keyCode == Keyboard.UP){
                       offsetRow = -1;
                   } else if (event.keyCode == Keyboard.DOWN){
                       offsetRow = 1;
                   } else if (event.keyCode == Keyboard.LEFT){
                       offsetCol = -1;
                   } else if (event.keyCode == Keyboard.RIGHT){
                       offsetCol = 1;
                   } else {
                       return;
                   }
                   dg1.editedItemPosition = findNextEditableCell(position,offsetRow,offsetCol);
               } catch(e:Error) {
                   trace(e.message);
               }
           }

             private function findNextEditableCell(v:Object,offsetRow:int=0,offsetCol:int=0):Object
           {
               if (v == null ||  
                   (offsetRow == 0 && offsetCol == 0) ||
                   (offsetRow != 0 && offsetCol != 0)) {
                   return null;
               }
               var loopCount:int = 0;
               var dataEditable:Boolean = false;
               while (!dataEditable && (loopCount < 2)) {
                   if (offsetCol != 0) {
                       if ((v.columnIndex + offsetCol) < dg1.columns.length &&
                           (v.columnIndex + offsetCol) >= 0) {
                            v.columnIndex = v.columnIndex + offsetCol;
                       } else {
                           if ((v.rowIndex + offsetCol) < dg1.dataProvider.length &&
                               (v.rowIndex + offsetCol) >= 0) {
                              
                               v.rowIndex = v.rowIndex + offsetCol; 
 
                               if (offsetCol > 0) {
                                   v.columnIndex = 0;
                               } else {
                                   v.columnIndex = dg1.columns.length -1;
                               }
                           } else {
                               if (offsetCol > 0) {
                                   v.columnIndex = 0;
                                   v.rowIndex = 0;
                               } else {
                                   v.columnIndex = dg1.columns.length -1;
                                   v.rowIndex = dg1.dataProvider.length -1;
                               }
                               loopCount ++;
                           }
                       }
                   } else {
                       if ((v.rowIndex + offsetRow) < dg1.dataProvider.length &&
                           (v.rowIndex + offsetRow) >= 0) {
                            v.rowIndex = v.rowIndex + offsetRow;
                       } else {
                           if (offsetRow > 0) {
                               v.rowIndex = 0;
                           } else {
                               v.rowIndex = dg1.dataProvider.length -1;
                           }
                           loopCount ++;
                       }
                   }
                   if (dg1.columns[v.columnIndex] != null &&
                       dg1.columns[v.columnIndex].editable) {
                      
                       if (v.columnIndex != 2) {
                           dataEditable = true;
                       } else {
                           dataEditable = false;
                       }
                   }
               }
               return v;
           }

           private function keyFocusChangeHandler(event:FocusEvent):void
           {
               if (event.keyCode == Keyboard.TAB)
               {
                   event.preventDefault();
               }
           }
       ]]>
   </mx:Script>

   <mx:Canvas verticalScrollBarStyleName="hh"
              height="614"
              width="831.5"
              horizontalCenter="-1"
              verticalCenter="0"
              verticalScrollPolicy="auto">

       <mx:AdvancedDataGrid id="dg1"
                            designViewDataType="flat"
                            sortExpertMode="true"
                            sortableColumns="false"
                            rowCount="5"
                            dataProvider="{data1}"
                            height="441"
                            width="811.5"
                            fontSize="14"
                            fontFamily="Times New Roman"
                            editable="true"
                            enabled="true"
                            x="10"
                            y="55"
                            itemEditBegin="itemEditBeginHandler(event)"
                            keyDown="keydownDataGrid(event)">
                           

           <mx:groupedColumns>
               <mx:AdvancedDataGridColumn headerText="序号"
                                          dataField="xh"
                                          width="150"
                                          editable="false"/>
               <mx:AdvancedDataGridColumn headerText="COLUMN1" 
 
                                          dataField="col1"
                                          width="200"/>
               <mx:AdvancedDataGridColumn headerText="COLUMN2"
                                          dataField="col2"
                                          width="200"/>
               <mx:AdvancedDataGridColumn headerText="COLUMN3"
                                          dataField="col3"
                                          width="200"/>
               <mx:AdvancedDataGridColumn headerText="COLUMN4"
                                          dataField="col4"
                                          width="200"/>
               <mx:AdvancedDataGridColumn headerText="COLUMN5"
                                          dataField="col5"
                                          width="200"/>

           </mx:groupedColumns>
       </mx:AdvancedDataGrid>

   </mx:Canvas>

</mx:Application>