我在AdvancedDataGrid的一列中添加了按钮（最后一行）。 对于具有添加按钮的行，其余字段不可见。 单击添加按钮后，新行将添加到网格中供用户添加。 之后，此按钮变为删除按钮（标签变为' - '，并在底部添加新行以添加另一行）。 当我点击删除按钮（标签' - '）时，最后一行获得添加按钮（'+'标签），但该行的字段变为可见。
请有人解释一下 以下是示例代码
<?xml version="1.0" encoding="utf-8"?>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
width="400"
height="300"
initialize="group1_initializeHandler(event)">
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.events.AdvancedDataGridEvent;
import mx.events.CollectionEvent;
import mx.events.DataGridEvent;
import mx.events.FlexEvent;
import mx.events.IndexChangedEvent;
import spark.events.IndexChangeEvent;
protected function group1_initializeHandler(event:FlexEvent):void
{
alarms=new ArrayCollection();
alarms.addItem(initalarmRow());
//alarms.addEventListener(CollectionEvent.COLLECTION_CHANGE, populateFieldDetails);
alarms.addItem(populateFieldforButton());
populateEvents();
}
private var _addButton:Boolean
[Bindable]
public function get addButton():Boolean
{
return _addButton;
}
public function set addButton(value:Boolean):void
{
_addButton=value;
}
private var _alarms:ArrayCollection;
[Bindable]
public function get alarms():ArrayCollection
{
return _alarms;
}
public function set alarms(value:ArrayCollection):void
{
_alarms=value;
}
private var _alarmRow:alarmVO;
[Bindable]
public function get alarmRow():alarmVO
{
return _alarmRow;
}
public function set alarmRow(value:alarmVO):void
{
_alarmRow=value;
}
// Initiliaze an alarmVO for a new row
private function initalarmRow():alarmVO
{
alarmRow=new alarmVO();
alarmRow.buttonLabel='-';
channels=new ArrayCollection;
for (var i:int=0; i < 10; i++)
{
var vo:ChannelVO=new ChannelVO();
vo.id=i;
vo.name="channel_" + i;
vo.messageType="Message_" + i;
channels.addItem(vo);
}
alarmRow.eventName="Event_1";
alarmRow.channel=channels.getItemAt(5) as ChannelVO;
return alarmRow;
}
private var _events:ArrayCollection;
[Bindable]
public function get events():ArrayCollection
{
return _events;
}
public function set events(value:ArrayCollection):void
{
_events=value;
}
private var _channels:ArrayCollection;
[Bindable]
public function get channels():ArrayCollection
{
return _channels;
}
public function set channels(value:ArrayCollection):void
{
_channels=value;
}
public function populateFieldforButton():alarmVO
{
alarmRow=new alarmVO();
alarmRow.buttonLabel="+";
return alarmRow;
}
public function populateEvents():void
{
events=new ArrayCollection();
for (var i:int=0; i < 3; i++)
{
var event:EventVO=new EventVO();
event.id=i;
event.eventName="Event_" + i;
events.addItem(event);
}
}
public function populateFieldDetails(event:Event):void
{
for (var count:int; count < alarms.length; count++)
{
//trace('alarms.getItemAt(count).buttonLabel :' + alarms.getItemAt(count).buttonLabel);
if (alarms.getItemAt(count).buttonLabel == '+')
{
alarms.getItemAt(count).channel=null;
alarms.getItemAt(count).eventName=null;
}
adgdalarmManagement.invalidateDisplayList();
}
}
public function preventEditing(event:AdvancedDataGridEvent):void
{
//check if it is the last row(it should not be editable)
if (event.rowIndex == alarms.length - 1)
{
event.preventDefault();
//trace('**** :' + event.currentTarget);
}
}
public function adgdalarmManagement_creationCompleteHandler(event:FlexEvent):void
{
}
protected function adgdalarmManagement_dataChangeHandler(event:FlexEvent):void
{
// TODO Auto-generated method stub
}
public function ddlEventType_creationCompleteHandler(event:FlexEvent, data:Object):void
{
for (var count:int=0; count < alarms.length; count++)
{
for (var count1:int=0; count1 < events.length; count1++)
{
if (events.getItemAt(count1).eventName == alarms.getItemAt(count).eventName)
{
event.currentTarget.selectedIndex=count1;
break;
}
}
}
checkEventTypeVisible(event, data);
}
public function checkEventTypeVisible(event:FlexEvent, data:Object):void
{
if (data == '-')
{
event.currentTarget.visible=true;
}
else
{
event.currentTarget.visible=false;
}
}
public function button1_clickHandler(event:MouseEvent):void
{
if (event.currentTarget.label == '-')
{
event.currentTarget.parent.parent.parent.parent.dataProvider.removeItemAt(event.currentTarget.parent.parent.parent.parent.selectedIndex);
event.currentTarget.parent.parent.parent.parent.dataProvider.refresh();
adgdalarmManagement.validateNow();
}
else
{
var selectedIndex:int=event.currentTarget.parent.parent.parent.parent.selectedIndex;
alarmRow=new alarmVO();
alarmRow.buttonLabel='-';
alarmRow.eventName="";
alarmRow.channel=new ChannelVO();
event.currentTarget.parent.parent.parent.parent.dataProvider.removeItemAt(event.currentTarget.parent.parent.parent.parent.selectedIndex);
event.currentTarget.parent.parent.parent.parent.dataProvider.addItemAt(alarmRow, selectedIndex);
event.currentTarget.parent.parent.parent.parent.dataProvider.addItemAt(populateFieldforButton(), selectedIndex + 1);
}
}
public function ddlChannel_changeHandler(event:IndexChangeEvent):void
{
event.target.parent.data.typeDisplay=event.target.selectedItem.name;
event.target.parent.data.messageTypeDisplay=event.target.selectedItem.messageType;
}
public function ddlChannel_creationCompleteHandler(event:FlexEvent, data:Object):void
{
// TODO Auto-generated method stub
if (channels != null)
{
if (alarms != null)
for (var count:int=0; count < alarms.length; count++)
{
for (var count1:int=0; count1 < channels.length; count1++)
{
if (alarms.getItemAt(count).channel != null)
{
if (channels.getItemAt(count1).name == alarms.getItemAt(count).channel.name)
{
event.currentTarget.selectedIndex=count1;
break;
}
}
else
{
event.currentTarget.selectedIndex=0;
}
}
}
}
else
{
event.currentTarget.selectedIndex=0;
}
checkVisible(event, data);
}
public function checkVisible(event:FlexEvent, data:Object):void
{
if (data == '-')
{
event.currentTarget.visible=true;
}
else
{
event.currentTarget.visible=false;
}
}
]]>
</fx:Script>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:VGroup paddingTop="10"
paddingBottom="10"
paddingLeft="10"
paddingRight="10"
width="100%"
height="100%"
id="vbxChannelManagement">
<!-- Added for Rounding off Corners of GRID-->
<mx:ApplicationControlBar width="100%"
cornerRadius="8"
height="100%">
<mx:AdvancedDataGrid id="adgdalarmManagement"
width="100%"
height="100%"
dataProvider="{alarms}"
dataChange="adgdalarmManagement_dataChangeHandler(event)"
creationComplete="adgdalarmManagement_creationCompleteHandler(event)">
<mx:columns>
<mx:AdvancedDataGridColumn id="adgcAdRemove"
width="30"
dataField="buttonLabel">
<mx:itemRenderer>
<fx:Component>
<s:MXAdvancedDataGridItemRenderer>
<s:Button label="{data.buttonLabel}"
width="30"
click="outerDocument.button1_clickHandler(event)"/>
</s:MXAdvancedDataGridItemRenderer>
</fx:Component>
</mx:itemRenderer>
</mx:AdvancedDataGridColumn>
<mx:AdvancedDataGridColumn id="adgcEvent"
dataField="buttonLabel"
headerText="Event">
<mx:itemRenderer>
<fx:Component>
<s:MXAdvancedDataGridItemRenderer>
<s:HGroup id="eventGroup"
visible="{(this.parent.data.buttonLabel=='-')?true:false}}">
<s:DropDownList id="ddlEventType"
dataProvider="{outerDocument.events}"
creationComplete="outerDocument.ddlEventType_creationCompleteHandler(event,data.buttonLabel)"
labelField="eventName"/>
</s:HGroup>
</s:MXAdvancedDataGridItemRenderer>
</fx:Component>
</mx:itemRenderer>
</mx:AdvancedDataGridColumn>
<mx:AdvancedDataGridColumn id="adgcChannel"
dataField="buttonLabel"
headerText="Channel">
<mx:itemRenderer>
<fx:Component>
<s:MXAdvancedDataGridItemRenderer>
<!--<s:HGroup width="100%"
id="channelField"
>-->
<s:DropDownList id="ddlChannel"
width="100%"
dataProvider="{outerDocument.channels}"
creationComplete="outerDocument.ddlChannel_creationCompleteHandler(event,data.buttonLabel)"
labelField="id"
change="outerDocument.ddlChannel_changeHandler(event)"
/>
<!--</s:HGroup>-->
</s:MXAdvancedDataGridItemRenderer>
</fx:Component>
</mx:itemRenderer>
</mx:AdvancedDataGridColumn>
<mx:AdvancedDataGridColumn id="adgcChannelType"
headerText="Type"
dataField="typeDisplay"/>
<mx:AdvancedDataGridColumn id="adgcMessageType"
headerText="Message Type"
dataField="messageTypeDisplay"/>
</mx:columns>
</mx:AdvancedDataGrid>
</mx:ApplicationControlBar>
</s:VGroup>
</s:Group>
答案 0 :(得分：0)
我通过覆盖commitproperties函数并在该函数中检查下拉列表的可用性来实现它。
之类的东西override public function commitproperties():void{
super.commitporperties();
if(data.buttonLabel == '-')
this.visible = false;
}