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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";

function Bar(cls, orientation, scroll) {
    this.orientation = orientation;
    this.scroll = scroll;
    this.screen = this.total = this.size = 1;
    this.pos = 0;

this.node = document.createElement("div");
    this.node.className = cls + "-" + orientation;
    this.inner = this.node.appendChild(document.createElement("div"));

CodeMirror.on(this.node, "click", function(e) {
      CodeMirror.e_preventDefault(e);
      var innerBox = self.inner.getBoundingClientRect(), where;
      if (self.orientation == "horizontal")
        where = e.clientX < innerBox.left ? -1 : e.clientX > innerBox.right ? 1 : 0;
      else
        where = e.clientY < innerBox.top ? -1 : e.clientY > innerBox.bottom ? 1 : 0;
      self.moveTo(self.pos + where * self.screen);
    });

function onWheel(e) {
      var moved = CodeMirror.wheelEventPixels(e)[self.orientation == "horizontal" ? "x" : "y"];
      var oldPos = self.pos;
      self.moveTo(self.pos + moved);
      if (self.pos != oldPos) CodeMirror.e_preventDefault(e);
    }
    CodeMirror.on(this.node, "mousewheel", onWheel);
    CodeMirror.on(this.node, "DOMMouseScroll", onWheel);
  }

Bar.prototype.setPos = function(pos, force) {
    if (pos < 0) pos = 0;
    if (pos > this.total - this.screen) pos = this.total - this.screen;
    if (!force && pos == this.pos) return false;
    this.pos = pos;
    this.inner.style[this.orientation == "horizontal" ? "left" : "top"] =
      (pos * (this.size / this.total)) + "px";
    return true
  };

Bar.prototype.moveTo = function(pos) {
    if (this.setPos(pos)) this.scroll(pos, this.orientation);
  }

var minButtonSize = 10;

Bar.prototype.update = function(scrollSize, clientSize, barSize) {
    var sizeChanged = this.screen != clientSize || this.total != scrollSize || this.size != barSize
    if (sizeChanged) {
      this.screen = clientSize;
      this.total = scrollSize;
      this.size = barSize;
    }

var buttonSize = this.screen * (this.size / this.total);
    if (buttonSize < minButtonSize) {
      this.size -= minButtonSize - buttonSize;
      buttonSize = minButtonSize;
    }
    this.inner.style[this.orientation == "horizontal" ? "width" : "height"] =
      buttonSize + "px";
    this.setPos(this.pos, sizeChanged);
  };

function SimpleScrollbars(cls, place, scroll) {
    this.addClass = cls;
    this.horiz = new Bar(cls, "horizontal", scroll);
    place(this.horiz.node);
    this.vert = new Bar(cls, "vertical", scroll);
    place(this.vert.node);
    this.width = null;
  }

SimpleScrollbars.prototype.update = function(measure) {
    if (this.width == null) {
      var style = window.getComputedStyle ? window.getComputedStyle(this.horiz.node) : this.horiz.node.currentStyle;
      if (style) this.width = parseInt(style.height);
    }
    var width = this.width || 0;

var needsH = measure.scrollWidth > measure.clientWidth + 1;
    var needsV = measure.scrollHeight > measure.clientHeight + 1;
    this.vert.node.style.display = needsV ? "block" : "none";
    this.horiz.node.style.display = needsH ? "block" : "none";

if (needsV) {
      this.vert.update(measure.scrollHeight, measure.clientHeight,
                       measure.viewHeight - (needsH ? width : 0));
      this.vert.node.style.bottom = needsH ? width + "px" : "0";
    }
    if (needsH) {
      this.horiz.update(measure.scrollWidth, measure.clientWidth,
                        measure.viewWidth - (needsV ? width : 0) - measure.barLeft);
      this.horiz.node.style.right = needsV ? width + "px" : "0";
      this.horiz.node.style.left = measure.barLeft + "px";
    }

return {right: needsV ? width : 0, bottom: needsH ? width : 0};
  };

SimpleScrollbars.prototype.setScrollTop = function(pos) {
    this.vert.setPos(pos);
  };

SimpleScrollbars.prototype.setScrollLeft = function(pos) {
    this.horiz.setPos(pos);
  };

SimpleScrollbars.prototype.clear = function() {
    var parent = this.horiz.node.parentNode;
    parent.removeChild(this.horiz.node);
    parent.removeChild(this.vert.node);
  };

CodeMirror.scrollbarModel.simple = function(place, scroll) {
    return new SimpleScrollbars("CodeMirror-simplescroll", place, scroll);
  };
  CodeMirror.scrollbarModel.overlay = function(place, scroll) {
    return new SimpleScrollbars("CodeMirror-overlayscroll", place, scroll);
  };
});