DeepASMR_web/scroll.js at main · Deep-ASMR/DeepASMR_web · GitHub

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(function () {
  "use strict";
  /*[pan and well CSS scrolls]*/
  var pnls = document.querySelectorAll(".panel").length,
    scdir,
    hold = false;

  function _scrollY(obj) {
    var slength,
      plength,
      pan,
      step = 100,
      vh = window.innerHeight / 100,
      vmin = Math.min(window.innerHeight, window.innerWidth) / 100;
    if (
      (this !== undefined && this.id === "well") ||
      (obj !== undefined && obj.id === "well")
    ) {
      pan = this || obj;
      plength = parseInt(pan.offsetHeight / vh);
    }
    if (pan === undefined) {
      return;
    }
    plength = plength || parseInt(pan.offsetHeight / vmin);
    slength = parseInt(pan.style.transform.replace("translateY(", ""));
    if (scdir === "up" && Math.abs(slength) < plength - plength / pnls) {
      slength = slength - step;
    } else if (scdir === "down" && slength < 0) {
      slength = slength + step;
    } else if (scdir === "top") {
      slength = 0;
    }
    if (hold === false) {
      hold = true;
      pan.style.transform = "translateY(" + slength + "vh)";
      setTimeout(function () {
        hold = false;
      }, 1000);
    }
    console.log(
      scdir + ":" + slength + ":" + plength + ":" + (plength - plength / pnls)
    );
  }
  /*[swipe detection on touchscreen devices]*/
  function _swipe(obj) {
    var swdir,
      sX,
      sY,
      dX,
      dY,
      threshold = 100,
      /*[min distance traveled to be considered swipe]*/
      slack = 50,
      /*[max distance allowed at the same time in perpendicular direction]*/
      alT = 500,
      /*[max time allowed to travel that distance]*/
      elT /*[elapsed time]*/,
      stT; /*[start time]*/
    obj.addEventListener(
      "touchstart",
      function (e) {
        var tchs = e.changedTouches[0];
        swdir = "none";
        sX = tchs.pageX;
        sY = tchs.pageY;
        stT = new Date().getTime();
        //e.preventDefault();
      },
      false
    );

    obj.addEventListener(
      "touchmove",
      function (e) {
        e.preventDefault(); /*[prevent scrolling when inside DIV]*/
      },
      false
    );

    obj.addEventListener(
      "touchend",
      function (e) {
        var tchs = e.changedTouches[0];
        dX = tchs.pageX - sX;
        dY = tchs.pageY - sY;
        elT = new Date().getTime() - stT;
        if (elT <= alT) {
          if (Math.abs(dX) >= threshold && Math.abs(dY) <= slack) {
            swdir = dX < 0 ? "left" : "right";
          } else if (Math.abs(dY) >= threshold && Math.abs(dX) <= slack) {
            swdir = dY < 0 ? "up" : "down";
          }
          if (obj.id === "well") {
            if (swdir === "up") {
              scdir = swdir;
              _scrollY(obj);
            } else if (
              swdir === "down" &&
              obj.style.transform !== "translateY(0)"
            ) {
              scdir = swdir;
              _scrollY(obj);
            }
            e.stopPropagation();
          }
        }
      },
      false
    );
  }
  /*[assignments]*/
  var well = document.getElementById("well");
  well.style.transform = "translateY(0)";
  well.addEventListener("wheel", function (e) {
    if (e.deltaY < 0) {
      scdir = "down";
    }
    if (e.deltaY > 0) {
      scdir = "up";
    }
    e.stopPropagation();
  });
  well.addEventListener("wheel", _scrollY);
  _swipe(well);
  var tops = document.querySelectorAll(".top");
  for (var i = 0; i < tops.length; i++) {
    tops[i].addEventListener("click", function () {
      scdir = "top";
      _scrollY(well);
    });
  }
})();