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我的目标是知道用户何时按下剪切、复制、粘贴或选择所有键盘快捷键，并对每个快捷键进行一些处理。我尝试监听按键，但是当控制键按下时只有一些键被触发（显然它只能在浏览器中工作，除了 IE）。

然后我正在阅读 Flash 文档并遇到了Event.COPY、Event.PASTE和Event.CUT事件，这些事件被分派到“当前具有焦点的对象”。我将侦听器附加到这些事件的文档类并将 stage.focus 设置为文档类，但我的事件侦听器从未被调用。

有人用过这些事件吗？有没有关于如何使用它们的例子？

注意：这是在 Flash Player 10 中（包括内部 CS4 版本（选中“禁用快捷方式”）和独立版本）。我没有在任何浏览器中尝试过。

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2 回答 2

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除了无法从 TextFields 捕获此类事件（或当焦点位于 TextField 上时）的限制之外，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（除非它是一个文本字段^^）。

请记住，您只能通过直接设置 stage.focus 属性以及在 tabEnabled InteractiveObjects 上单击或切换来设置焦点。

于 2009-07-28T07:36:19.260 回答
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为了完整起见，这是我最终使用的类，以允许焦点转到“白名单”上的几个对象，然后当焦点从白名单对象中丢失时将焦点恢复为默认对象（除非它要去另一个白名单对象）：


/*
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();
            }
        }
    }
}

init使用文档类的stage对象和您希望焦点默认返回的对象调用静态方法。addToWhitelist然后使用静态方法将对象添加到白名单中。

于 2009-08-11T19:48:21.610 回答