Actionscript 3 在闪存中接收Event.COPY事件

我的目标是了解用户何时按下剪切、复制、粘贴或选择所有键盘快捷键，并对每个快捷键进行处理。我试着去听按键，但只有一些按键在控制键关闭时被触发。很明显，它只能在浏览器中工作，IE除外

然后我在阅读Flash文档时，遇到了被分派到当前具有焦点的对象的事件。我为这些事件将侦听器附加到document类，并将stage.focus设置为document类，但我的事件侦听器从未被调用

有人使用过这些事件吗？有没有关于如何使用它们的例子

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注意：这在Flash Player 10中，包括内部CS4（禁用快捷键）和单机版。我没有在任何浏览器中尝试过它。

除了不能从TextFields捕获此类事件的限制，或者当焦点位于TextField上时，请确保stage.focus属性确实设置为您将侦听器附加到的InteractiveObject，或其任何子对象，除非它是TextField^^

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请记住，您只能通过直接设置stage.focus属性，以及单击或按住tabEnabled InteractiveObject上的Tab键来设置焦点。

为了完整起见，我最后使用了一个类来允许焦点转到白名单上的几个对象，然后，当焦点从白名单对象丢失时，将焦点恢复为默认对象，除非它将转到另一个白名单对象：

/*
Copyright (c) 2009, Cameron Desrochers
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted
provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of
      conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list
      of conditions and the following disclaimer in the documentation and/or other materials
      provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


package
{
    import fl.controls.ColorPicker;
    import flash.display.DisplayObject;
    import flash.display.InteractiveObject;
    import flash.display.DisplayObjectContainer;
    import flash.display.Sprite;
    import flash.display.Stage;
    import flash.events.Event;
    import flash.events.FocusEvent;
    import flash.events.MouseEvent;
    import flash.geom.Point;
    import flash.utils.Dictionary;



    public class FocusManager
    {
        public static var stage:Stage;
        public static var defaultFocalObject:DisplayObjectContainer;

        private static var _whiteList:Array = new Array();


        public static function init(stage:Stage, defaultFocalObject:DisplayObjectContainer):void
        {
            FocusManager.stage = stage;
            FocusManager.defaultFocalObject = defaultFocalObject;

            stage.addEventListener(MouseEvent.CLICK, onStageClicked);

            defaultFocalObject.addEventListener(FocusEvent.FOCUS_OUT, onObjectFocusOut);

            restoreDefaultFocus();
        }


        public static function restoreDefaultFocus():void
        {
            stage.focus = defaultFocalObject;
        }


        public static function addToWhiteList(object:InteractiveObject):void
        {
            if (Object(object).constructor == ColorPicker) {        // Special case
                // ColorPicker objects possess a textField that is for some reason not a child of the
                // ColorPicker, and so the textField has to be added separately.

                addToWhiteList(ColorPicker(object).textField);
            }

            _whiteList.push(object);

            object.addEventListener(FocusEvent.FOCUS_OUT, onObjectFocusOut);
            object.addEventListener(Event.REMOVED_FROM_STAGE, onObjectRemovedFromStage);
        }


        private static function onObjectFocusOut(e:FocusEvent):void
        {
            //trace('e.target:', e.target);
            //trace('e.relatedObject:', e.relatedObject);

            if ((e.relatedObject == null) || ((e.relatedObject !== defaultFocalObject) && (!whiteListContains(e.relatedObject)))) {
                // Object that is gaining focus is not in white-list, restore focus:

                //trace('restoring default focus');
                restoreDefaultFocus();
            }
        }


        private static function whiteListContains(object):Boolean
        {
            var inList:Boolean = false;

            for each (var listItem in _whiteList) {
                if ((object === listItem) || ((listItem.hasOwnProperty('contains')) && (listItem.contains(object)))) {
                    inList = true;
                    break;
                }
            }

            return inList;
        }


        private static function onObjectRemovedFromStage(e:Event):void
        {
            restoreDefaultFocus();
        }


        private static function onStageClicked(e:MouseEvent):void
        {
            var objectsUnderClick:Array = stage.getObjectsUnderPoint(new Point(stage.mouseX, stage.mouseY));

            var clickedOnWhiteListItem:Boolean = false;
            for each (var object in objectsUnderClick) {
                if (whiteListContains(object)) {
                    clickedOnWhiteListItem = true;
                    break;
                }
            }

            if (!clickedOnWhiteListItem) {
                restoreDefaultFocus();
            }
        }
    }
}

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使用文档类的stage对象和默认情况下希望焦点返回的对象调用static init方法。然后使用静态AddToHitelist方法将对象添加到白名单中。

你说得对-事实证明我确实设置了stage.focus，但由于我的应用程序特有的情况，我不得不在做任何事情之前单击某个区域，焦点发生了变化，我的事件再也听不到了。我用一个非常粗糙但有效的解决方案解决了这个问题：我监听focusOut事件，然后将stage.focus设置到具有事件侦听器的InteractiveObject。不过，我以后还得想些别的办法，因为当我有动态文本字段时，这可能行不通：-