@egjs/axes

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A module used to change the information of user action entered by various input devices such as touch screen or mouse into the logical virtual coordinates. You can easily create a UI that responds to user actions.
github.com/naver/egjs-axes
naver/egjs-axes
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      <a href="../index.html">All files</a> / <a href="index.html">src</a> utils.ts
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/*
 * Copyright (c) 2015 NAVER Corp.
 * egjs projects are licensed under the MIT license
 */
import { window } from "./browser";
import { PREVENT_DRAG_CSSPROPS } from "./const";
import { PanInputOption } from "./inputType/PanInput";
import { PinchInputOption } from "./inputType/PinchInput";
import { ObjectInterface } from "./types";
import {
  DIRECTION_NONE,
  DIRECTION_VERTICAL,
  DIRECTION_HORIZONTAL,
  DIRECTION_ALL,
} from "./const";
&nbsp;
declare let jQuery: any;
&nbsp;
export const toArray = (nodes: NodeList): HTMLElement[] =&gt; {
  // const el = Array.prototype.slice.call(nodes);
  // for IE8
  const el = [];
  for (let i = 0, len = nodes.length; i &lt; len; i++) {
    el.push(nodes[i]);
  }
  return el;
};
&nbsp;
export const $ = (param, multi = false) =&gt; {
  let el;
  if (typeof param === "string") {
    // String (HTML, Selector)
    // check if string is HTML tag format
    const match = param.match(/^&lt;([a-z]+)\s*([^&gt;]*)&gt;/);
&nbsp;
    // creating element
    if (match) {
      // HTML
      const dummy = document.createElement("div");
&nbsp;
      dummy.innerHTML = param;
      el = toArray(dummy.childNodes);
    } else {
      // Selector
      el = toArray(document.querySelectorAll(param));
    }
    <span class="missing-if-branch" title="else path not taken" >E</span>if (!multi) {
      el = el.length &gt;= 1 ? el[0] : <span class="branch-1 cbranch-no" title="branch not covered" >undefined;</span>
    }
  } else if (param === window) {
    // window
    el = param;
  } else <span class="missing-if-branch" title="if path not taken" >I</span>if ("value" in param || "current" in param) {
<span class="cstat-no" title="statement not covered" >    el = param.value! || param.current!;</span>
  } else if (param.nodeName &amp;&amp; (param.nodeType === 1 || param.nodeType === 9)) {
    // HTMLElement, Document
    el = param;
  } else <span class="missing-if-branch" title="if path not taken" >I</span>if (
    ("jQuery" in window &amp;&amp; <span class="branch-1 cbranch-no" title="branch not covered" >param instanceof jQuery)</span> ||
    param.constructor.prototype.jquery
  ) {
    // jQuery
<span class="cstat-no" title="statement not covered" >    el = multi ? param.toArray() : param.get(0);</span>
  } else <span class="missing-if-branch" title="else path not taken" >E</span>if (Array.isArray(param)) {
    el = param.map((v) =&gt; $(v));
    <span class="missing-if-branch" title="if path not taken" >I</span>if (!multi) {
<span class="cstat-no" title="statement not covered" >      el = el.length &gt;= 1 ? el[0] : undefined;</span>
    }
  }
  return el;
};
&nbsp;
let raf = window.requestAnimationFrame || <span class="branch-1 cbranch-no" title="branch not covered" >window.webkitRequestAnimationFrame;</span>
let caf = window.cancelAnimationFrame || <span class="branch-1 cbranch-no" title="branch not covered" >window.webkitCancelAnimationFrame;</span>
<span class="missing-if-branch" title="if path not taken" >I</span>if (raf &amp;&amp; !caf) {
  const keyInfo = <span class="cstat-no" title="statement not covered" >{};</span>
  const oldraf = <span class="cstat-no" title="statement not covered" >raf;</span>
<span class="cstat-no" title="statement not covered" >  raf = <span class="fstat-no" title="function not covered" >(</span>callback: FrameRequestCallback) =&gt; {</span>
    const wrapCallback = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >(</span>timestamp: number) =&gt; {</span>
<span class="cstat-no" title="statement not covered" >      if (keyInfo[key]) {</span>
<span class="cstat-no" title="statement not covered" >        callback(timestamp);</span>
      }
    };
    const key = <span class="cstat-no" title="statement not covered" >oldraf(wrapCallback);</span>
<span class="cstat-no" title="statement not covered" >    keyInfo[key] = true;</span>
<span class="cstat-no" title="statement not covered" >    return key;</span>
  };
<span class="cstat-no" title="statement not covered" >  caf = <span class="fstat-no" title="function not covered" >(</span>key: number) =&gt; {</span>
<span class="cstat-no" title="statement not covered" >    delete keyInfo[key];</span>
  };
} else <span class="missing-if-branch" title="if path not taken" >I</span>if (!(raf &amp;&amp; caf)) {
<span class="cstat-no" title="statement not covered" >  raf = <span class="fstat-no" title="function not covered" >(</span>callback: FrameRequestCallback) =&gt; {</span>
<span class="cstat-no" title="statement not covered" >    return window.setTimeout(<span class="fstat-no" title="function not covered" >() =&gt; {</span></span>
<span class="cstat-no" title="statement not covered" >      callback(</span>
        ((window.performance &amp;&amp;
          window.performance.now &amp;&amp;
          window.performance.now()) as number) || new Date().getTime()
      );
    }, 16);
  };
<span class="cstat-no" title="statement not covered" >  caf = window.clearTimeout;</span>
}
&nbsp;
/**
 * A polyfill for the window.requestAnimationFrame() method.
 * @see  https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame
 * @private
 */
export const requestAnimationFrame = (fp) =&gt; {
  return raf(fp);
};
/**
 * A polyfill for the window.cancelAnimationFrame() method. It cancels an animation executed through a call to the requestAnimationFrame() method.
 * @param {Number} key −  The ID value returned through a call to the requestAnimationFrame() method. &lt;ko&gt;requestAnimationFrame() 메서드가 반환한 아이디 값&lt;/ko&gt;
 * @see  https://developer.mozilla.org/en-US/docs/Web/API/Window/cancelAnimationFrame
 * @private
 */
export const cancelAnimationFrame = (key) =&gt; {
  caf(key);
};
&nbsp;
export const map = &lt;T, U&gt;(
  obj: ObjectInterface&lt;T&gt;,
  callback: (value: T, key: string) =&gt; U
): ObjectInterface&lt;U&gt; =&gt; {
  const tranformed: ObjectInterface&lt;U&gt; = {};
&nbsp;
  for (const k in obj) {
    <span class="missing-if-branch" title="else path not taken" >E</span>if (k) {
      tranformed[k] = callback(obj[k], k);
    }
  }
  return tranformed;
};
&nbsp;
export const filter = &lt;T&gt;(
  obj: ObjectInterface&lt;T&gt;,
  callback: (value: T, key: string) =&gt; boolean
): ObjectInterface&lt;T&gt; =&gt; {
  const filtered: ObjectInterface&lt;T&gt; = {};
&nbsp;
  for (const k in obj) {
    if (k &amp;&amp; callback(obj[k], k)) {
      filtered[k] = obj[k];
    }
  }
  return filtered;
};
export const every = &lt;T&gt;(
  obj: ObjectInterface&lt;T&gt;,
  callback: (value: T, key: string) =&gt; boolean
) =&gt; {
  for (const k in obj) {
    if (k &amp;&amp; !callback(obj[k], k)) {
      return false;
    }
  }
  return true;
};
export const equal = (
  target: ObjectInterface,
  base: ObjectInterface
): boolean =&gt; {
  return every(target, (v, k) =&gt; v === base[k]);
};
&nbsp;
const roundNumFunc = {};
&nbsp;
export const roundNumber = (num: number, roundUnit: number) =&gt; {
  // Cache for performance
  if (!roundNumFunc[roundUnit]) {
    roundNumFunc[roundUnit] = getRoundFunc(roundUnit);
  }
&nbsp;
  return roundNumFunc[roundUnit](num);
};
&nbsp;
export const roundNumbers = (
  num: ObjectInterface&lt;number&gt;,
  roundUnit: ObjectInterface&lt;number&gt; | number
): ObjectInterface&lt;number&gt; =&gt; {
  if (!num || !roundUnit) {
    return num;
  }
  return map(num, (value, key) =&gt;
    roundNumber(
      value,
      typeof roundUnit === "number" ? roundUnit : <span class="branch-1 cbranch-no" title="branch not covered" >roundUnit[key]</span>
    )
  );
};
&nbsp;
export const getDecimalPlace = (val: number): number =&gt; {
  <span class="missing-if-branch" title="if path not taken" >I</span>if (!isFinite(val)) {
<span class="cstat-no" title="statement not covered" >    return 0;</span>
  }
&nbsp;
  const v = `${val}`;
&nbsp;
  if (v.indexOf("e") &gt;= 0) {
    // Exponential Format
    // 1e-10, 1e-12
    let p = 0;
    let e = 1;
&nbsp;
    while (Math.round(val * e) / e !== val) {
      e *= 10;
      p++;
    }
&nbsp;
    return p;
  }
&nbsp;
  // In general, following has performance benefit.
  // https://jsperf.com/precision-calculation
  return v.indexOf(".") &gt;= 0 ? v.length - v.indexOf(".") - 1 : 0;
};
&nbsp;
export const inversePow = (n: number) =&gt; {
  // replace Math.pow(10, -n) to solve floating point issue.
  // eg. Math.pow(10, -4) =&gt; 0.00009999999999999999
  return 1 / Math.pow(10, n);
};
&nbsp;
export const getRoundFunc = (v: number) =&gt; {
  const p = v &lt; 1 ? Math.pow(10, getDecimalPlace(v)) : 1;
&nbsp;
  return (n: number) =&gt; {
    if (v === 0) {
      return 0;
    }
&nbsp;
    return Math.round(Math.round(n / v) * v * p) / p;
  };
};
&nbsp;
export const getAngle = (posX: number, posY: number) =&gt; {
  return (Math.atan2(posY, posX) * 180) / Math.PI;
};
&nbsp;
export const isCssPropsFromAxes = (originalCssProps: {
  [key: string]: string;
}) =&gt; {
  let same = true;
  Object.keys(PREVENT_DRAG_CSSPROPS).forEach((prop) =&gt; {
    if (
      !originalCssProps ||
      originalCssProps[prop] !== PREVENT_DRAG_CSSPROPS[prop]
    ) {
      same = false;
    }
  });
  return same;
};
&nbsp;
export const getDirection = (
  useHorizontal: boolean,
  useVertical: boolean
): number =&gt; {
  if (useHorizontal &amp;&amp; useVertical) {
    return DIRECTION_ALL;
  } else if (useHorizontal) {
    return DIRECTION_HORIZONTAL;
  } else <span class="missing-if-branch" title="else path not taken" >E</span>if (useVertical) {
    return DIRECTION_VERTICAL;
  } else {
<span class="cstat-no" title="statement not covered" >    return DIRECTION_NONE;</span>
  }
};
&nbsp;
export const useDirection = (
  checkType: number,
  direction: number,
  userDirection?: number
): boolean =&gt; {
  if (userDirection) {
    return !!(
      direction === DIRECTION_ALL ||
      (direction &amp; checkType &amp;&amp; userDirection &amp; checkType)
    );
  } else {
    return !!(direction &amp; checkType);
  }
};
&nbsp;
export const setCssProps = (
  element: HTMLElement,
  option: PanInputOption | PinchInputOption,
  direction: number
): { [key: string]: string } =&gt; {
  const touchActionMap = {
    [DIRECTION_NONE]: "auto",
    [DIRECTION_ALL]: "none",
    [DIRECTION_VERTICAL]: "pan-x",
    [DIRECTION_HORIZONTAL]: "pan-y",
  };
  const oldCssProps = {};
  <span class="missing-if-branch" title="else path not taken" >E</span>if (element &amp;&amp; element.style) {
    const touchAction = option.touchAction
      ? option.touchAction
      : touchActionMap[direction];
    const newCssProps = {
      ...PREVENT_DRAG_CSSPROPS,
      "touch-action":
        element.style["touch-action"] === "none" ? "none" : touchAction,
    };
    Object.keys(newCssProps).forEach((prop) =&gt; {
      oldCssProps[prop] = element.style[prop];
    });
    // Old style props like user-select can be corrupted if you change the style directly in the logic above.
    Object.keys(newCssProps).forEach((prop) =&gt; {
      element.style[prop] = newCssProps[prop];
    });
  }
  return oldCssProps;
};
&nbsp;
export const revertCssProps = (
  element: HTMLElement,
  originalCssProps: { [key: string]: string }
): { [key: string]: string } =&gt; {
  if (element &amp;&amp; element.style &amp;&amp; originalCssProps) {
    Object.keys(originalCssProps).forEach((prop) =&gt; {
      element.style[prop] = originalCssProps[prop];
    });
  }
  return;
};
&nbsp;</pre></td></tr>
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