在Actionscript 3中将键代码转换为字符串

Question

我使用Adobe AIR 3.4 for Desktop运行时在Flash CS6中使用Actionscript 3.

我将某些键代码定义为整数值(以下示例为UP返回38,D为68)

var KEY_UP:uint = Keyboard.UP;
var KEY_D:uint = Keybaord.D;

但是,我需要向用户显示键的键(显然不能显示整数值).

如何将这些键盘值转换为字符串值,例如"Up"或"D"(而不是38和68)？

Answer 1

您可以获取属性名称describeType,并将属性作为String访问Keyboard["UP"].

所以,你可以创建表.例如

import flash.utils.describeType;

function getKeyboardDict():Dictionary {
    var keyDescription:XML = describeType(Keyboard);
    var keyNames:XMLList = keyDescription..constant.@name;

    var keyboardDict:Dictionary = new Dictionary();

    var len:int = keyNames.length();
    for(var i:int = 0; i < len; i++) {
        keyboardDict[Keyboard[keyNames[i]]] = keyNames[i];
    }

    return keyboardDict;
}

var keyDict:Dictionary = getKeyboardDict();

trace(keyDict[Keyboard.UP]); //UP
trace(keyDict[Keyboard.SHIFT]); //SHIFT