Flex：失去组件焦点

Question

我有一个（希望）快速的问题。我有一些步进盒。尽管这可能适用于任何交互式组件。当我点击其他任何地方（包含舞台）时，我希望所选框失去焦点。是否有捷径可寻？我似乎无法找到一种有效的方式使它失去焦点。

Answer 1

如果任何人在这里找到自己的方式寻求解决这个问题，这里就是答案：

private function onGlobalMouseUp(event : MouseEvent) : void { 
     var fm:FocusManager = new FocusManager(stage); 

     //Since Flash Player can set focus on subcomponents as well as on components themselves, 
     //findFocusManagerComponent is used to find the component that either has focus or contains the subcomponent 
     //that has focus. If, for example, a TextField contained within a TextArea component has focus, findFocusManagerComponent 
     //will return the TextArea component, and not the TextField. This being the case, we can definitely determine 
     //whether the target object of the MouseUp event is a component (or is part of a component). If the target 
     //object is NOT a component (nor contained within one), then we clear all component focus. 

     if(fm.findFocusManagerComponent(event.target as InteractiveObject) is UIComponent){ 
      //target of MouseUp is either a UIComponent, or is contained within a UIComponent, so do nothing. 
     }else{ 
      //target of MouseUp is neither a UIComponent, nor is it contained within a UIComponent, so set component focus to null. 
      fm.setFocus(null); 
     } 
    } 

Answer 2

也许你应该检查出FocusManager.hideFocus()。

也许将它绑定到您的UIComponent的focusOut事件。

Flex API

Answer 3

所以这里的解决方案，我想出来的，工作得非常好。我有一个名为add()的功能，它已被分配到applicationComplete。在该功能我包括：

this.skin.addEventListener(MouseEvent.MOUSE_UP, loseFocus); 

的呼叫：

private function loseFocus(e : MouseEvent) : void 
{ 
    if (e.eventPhase == EventPhase.AT_TARGET) 
    { 
     this.focusManager.deactivate(); 
    } 
} 

够简单了，而且做什么，我一直在寻找。 “阶段”过滤器是必要的，以防止其他组件注册点击。

重要提示：this.skin需要成为事件目标。舞台不会在Flex应用程序中暴露于鼠标。

Example Application Code

如果有人有更好的解决方案，请建议之一！