vue-kityminder-ggg/src/tool/key.js

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define(function(require, exports) {
  var keymap = require('./keymap');
  var CTRL_MASK = 0x1000;
  var ALT_MASK = 0x2000;
  var SHIFT_MASK = 0x4000;
    function hash(unknown) {
        if (typeof(unknown) == 'string') {
            return hashKeyExpression(unknown);
        }
        return hashKeyEvent(unknown);
    }
    function is(a, b) {
        return a && b && hash(a) == hash(b);
    }
    exports.hash = hash;
    exports.is = is;
    function hashKeyEvent(keyEvent) {
        var hashCode = 0;
        if (keyEvent.ctrlKey || keyEvent.metaKey) {
            hashCode |= CTRL_MASK;
        }
        if (keyEvent.altKey) {
            hashCode |= ALT_MASK;
        }
        if (keyEvent.shiftKey) {
            hashCode |= SHIFT_MASK;
        }
        // Shift, Control, Alt KeyCode ignored.
        if ([16, 17, 18, 91].indexOf(keyEvent.keyCode) === -1) {
           /**
             * 解决浏览器输入法状态下对keyDown的keyCode判断不准确的问题,使用keyIdentifier,
             * 可以解决chrome和safari下的各种问题,其他浏览器依旧有问题,然而那并不影响我们对特
             * 需判断的按键进行判断(比如Space在safari输入法态下就是229,其他的就不是)
             * @editor Naixor
             * @Date 2015-12-2
             */
      if (keyEvent.keyCode === 229 && keyEvent.keyIdentifier) {
        return hashCode |= parseInt(keyEvent.keyIdentifier.substr(2), 16);
      }
      hashCode |= keyEvent.keyCode;
    }
    return hashCode;
  }

  function hashKeyExpression(keyExpression) {
    var hashCode = 0;
    keyExpression.toLowerCase().split(/\s*\+\s*/).forEach(function(name) {
      switch(name) {
        case 'ctrl':
        case 'cmd':
          hashCode |= CTRL_MASK;
          break;
        case 'alt':
          hashCode |= ALT_MASK;
          break;
        case 'shift':
          hashCode |= SHIFT_MASK;
          break;
        default:
          hashCode |= keymap[name];
      }
    });
    return hashCode;
  }
});