我正在开发一个类的数据提供程序应用程序，并希望更进一步提高可用性并为导航添加选项卡，但我在下面的 tabIndex 代码什么也不做。我想在按钮和文本字段之间切换。制表符是否适用于数据提供者？
package
{
import fl.controls.Button;
import fl.controls.List;
import fl.controls.TextInput;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
public class EditableList extends Sprite
{
public function EditableList()
{
init();
}
private function init():void
{
addName_bn.addEventListener(MouseEvent.CLICK, onAddName);
addName_ti.addEventListener(Event.CHANGE, onNameEnter);
addName_ti.addEventListener("enter", onAddName);
deleteName_bn.addEventListener(MouseEvent.CLICK, onDeleteName);
editName_ti.addEventListener("enter", onDeleteName);
editName_ti.addEventListener(Event.CHANGE, onNameChange);
names_li.addEventListener(Event.CHANGE, onNameSelected);
addEventListener(Event.ENTER_FRAME, onNextFrame);
addEventListener(Event.ENTER_FRAME, onFocus);
addName_ti.setFocus();
}
private function onFocus(event:Event):void {
addName_ti.tabIndex = 0;
addName_bn.tabIndex = 1;
editName_ti.tabIndex = 2;
deleteName_bn.tabIndex = 3;
}
// Handler for when the next frame is reached after initialization, when buttons can be disabled.
private function onNextFrame(event:Event):void {
removeEventListener(Event.ENTER_FRAME, onNextFrame);
addName_bn.enabled = false;
deleteName_bn.enabled = false;
editName_ti.enabled = false;
}
// Handler for when the add name button is clicked, adds item to list.
private function onAddName(event:Event):void {
var newItem:Object = {label:addName_ti.text};
names_li.dataProvider.addItem(newItem);
names_li.dataProvider.sortOn("label");
addName_ti.text = "";
addName_bn.enabled = false;
addName_ti.setFocus();
}
// Handler for when text is entered into the add name textfield, enables the add name button.
private function onNameEnter(event:Event):void {
addName_bn.enabled = addName_ti.text.length > 0;
}
// Handler for when the delete name button is clicked, removes the list item.
private function onDeleteName(event:Event):void {
names_li.dataProvider.removeItemAt(names_li.selectedIndex);
deleteName_bn.enabled = false;
names_li.dataProvider.sortOn("label");
editName_ti.text = "";
editName_ti.enabled = false;
editName_ti.setFocus();
}
// Handler for when text is changed into the edit name textfield, alters the item in the list.
private function onNameChange(event:Event):void {
var newItem:Object = {label:editName_ti.text};
names_li.dataProvider.replaceItemAt(newItem, names_li.selectedIndex);
}
// Handler for when an item is selected in the list, populates fields and enables buttons.
private function onNameSelected(event:Event):void {
editName_ti.text = names_li.selectedItem.label;
editName_ti.enabled = true;
deleteName_bn.enabled = true;
}
}
}