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							180 lines
						
					
					
						
							4.7 KiB
						
					
					
				
			
		
		
	
	
							180 lines
						
					
					
						
							4.7 KiB
						
					
					
				(function (global, factory) {
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  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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  typeof define === 'function' && define.amd ? define(['exports'], factory) :
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  (global = global || self, factory(global.cssBoxModel = {}));
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}(this, function (exports) { 'use strict';
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  var prefix = 'Invariant failed';
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  function invariant(condition, message) {
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    if (condition) {
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      return;
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    }
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    {
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      throw new Error(prefix + ": " + (message || ''));
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    }
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  }
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  var getRect = function getRect(_ref) {
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    var top = _ref.top,
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        right = _ref.right,
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        bottom = _ref.bottom,
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        left = _ref.left;
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    var width = right - left;
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    var height = bottom - top;
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    var rect = {
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      top: top,
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      right: right,
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      bottom: bottom,
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      left: left,
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      width: width,
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      height: height,
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      x: left,
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      y: top,
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      center: {
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        x: (right + left) / 2,
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        y: (bottom + top) / 2
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      }
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    };
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    return rect;
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  };
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  var expand = function expand(target, expandBy) {
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    return {
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      top: target.top - expandBy.top,
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      left: target.left - expandBy.left,
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      bottom: target.bottom + expandBy.bottom,
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      right: target.right + expandBy.right
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    };
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  };
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  var shrink = function shrink(target, shrinkBy) {
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    return {
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      top: target.top + shrinkBy.top,
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      left: target.left + shrinkBy.left,
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      bottom: target.bottom - shrinkBy.bottom,
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      right: target.right - shrinkBy.right
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    };
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  };
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  var shift = function shift(target, shiftBy) {
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    return {
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      top: target.top + shiftBy.y,
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      left: target.left + shiftBy.x,
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      bottom: target.bottom + shiftBy.y,
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      right: target.right + shiftBy.x
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    };
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  };
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  var noSpacing = {
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    top: 0,
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    right: 0,
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    bottom: 0,
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    left: 0
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  };
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  var createBox = function createBox(_ref2) {
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    var borderBox = _ref2.borderBox,
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        _ref2$margin = _ref2.margin,
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        margin = _ref2$margin === void 0 ? noSpacing : _ref2$margin,
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        _ref2$border = _ref2.border,
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        border = _ref2$border === void 0 ? noSpacing : _ref2$border,
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        _ref2$padding = _ref2.padding,
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        padding = _ref2$padding === void 0 ? noSpacing : _ref2$padding;
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    var marginBox = getRect(expand(borderBox, margin));
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    var paddingBox = getRect(shrink(borderBox, border));
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    var contentBox = getRect(shrink(paddingBox, padding));
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    return {
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      marginBox: marginBox,
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      borderBox: getRect(borderBox),
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      paddingBox: paddingBox,
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      contentBox: contentBox,
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      margin: margin,
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      border: border,
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      padding: padding
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    };
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  };
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  var parse = function parse(raw) {
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    var value = raw.slice(0, -2);
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    var suffix = raw.slice(-2);
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    if (suffix !== 'px') {
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      return 0;
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    }
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    var result = Number(value);
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    !!isNaN(result) ?  invariant(false, "Could not parse value [raw: " + raw + ", without suffix: " + value + "]")  : void 0;
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    return result;
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  };
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  var getWindowScroll = function getWindowScroll() {
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    return {
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      x: window.pageXOffset,
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      y: window.pageYOffset
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    };
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  };
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  var offset = function offset(original, change) {
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    var borderBox = original.borderBox,
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        border = original.border,
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        margin = original.margin,
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        padding = original.padding;
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    var shifted = shift(borderBox, change);
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    return createBox({
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      borderBox: shifted,
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      border: border,
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      margin: margin,
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      padding: padding
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    });
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  };
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  var withScroll = function withScroll(original, scroll) {
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    if (scroll === void 0) {
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      scroll = getWindowScroll();
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    }
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    return offset(original, scroll);
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  };
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  var calculateBox = function calculateBox(borderBox, styles) {
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    var margin = {
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      top: parse(styles.marginTop),
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      right: parse(styles.marginRight),
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      bottom: parse(styles.marginBottom),
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      left: parse(styles.marginLeft)
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    };
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    var padding = {
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      top: parse(styles.paddingTop),
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      right: parse(styles.paddingRight),
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      bottom: parse(styles.paddingBottom),
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      left: parse(styles.paddingLeft)
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    };
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    var border = {
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      top: parse(styles.borderTopWidth),
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      right: parse(styles.borderRightWidth),
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      bottom: parse(styles.borderBottomWidth),
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      left: parse(styles.borderLeftWidth)
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    };
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    return createBox({
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      borderBox: borderBox,
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      margin: margin,
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      padding: padding,
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      border: border
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    });
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  };
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  var getBox = function getBox(el) {
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    var borderBox = el.getBoundingClientRect();
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    var styles = window.getComputedStyle(el);
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    return calculateBox(borderBox, styles);
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  };
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  exports.calculateBox = calculateBox;
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  exports.createBox = createBox;
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  exports.expand = expand;
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  exports.getBox = getBox;
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  exports.getRect = getRect;
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  exports.offset = offset;
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  exports.shrink = shrink;
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  exports.withScroll = withScroll;
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  Object.defineProperty(exports, '__esModule', { value: true });
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}));
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