text: /*---------------------------------------------------------------------------------------------
   *  Copyright (c) Microsoft Corporation. All rights reserved.
   *  Licensed under the MIT License. See License.txt in the project root for license information.
   *--------------------------------------------------------------------------------------------*/
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = function (d, b) {
          extendStatics = Object.setPrototypeOf ||
              ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
              function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
          return extendStatics(d, b);
      }
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  import './media/scrollbars.css';
  import * as dom from '../../dom.js';
  import { createFastDomNode } from '../../fastDomNode.js';
  import { StandardMouseWheelEvent } from '../../mouseEvent.js';
  import { HorizontalScrollbar } from './horizontalScrollbar.js';
  import { VerticalScrollbar } from './verticalScrollbar.js';
  import { Widget } from '../widget.js';
  import { TimeoutTimer } from '../../../common/async.js';
  import { Emitter } from '../../../common/event.js';
  import { dispose } from '../../../common/lifecycle.js';
  import * as platform from '../../../common/platform.js';
  import { Scrollable } from '../../../common/scrollable.js';
  var HIDE_TIMEOUT = 500;
  var SCROLL_WHEEL_SENSITIVITY = 50;
  var SCROLL_WHEEL_SMOOTH_SCROLL_ENABLED = true;
  var MouseWheelClassifierItem = /** @class */ (function () {
      function MouseWheelClassifierItem(timestamp, deltaX, deltaY) {
          this.timestamp = timestamp;
          this.deltaX = deltaX;
          this.deltaY = deltaY;
          this.score = 0;
      }
      return MouseWheelClassifierItem;
  }());
  var MouseWheelClassifier = /** @class */ (function () {
      function MouseWheelClassifier() {
          this._capacity = 5;
          this._memory = [];
          this._front = -1;
          this._rear = -1;
      }
      MouseWheelClassifier.prototype.isPhysicalMouseWheel = function () {
          if (this._front === -1 && this._rear === -1) {
              // no elements
              return false;
          }
          // 0.5 * last + 0.25 * before last + 0.125 * before before last + ...
          var remainingInfluence = 1;
          var score = 0;
          var iteration = 1;
          var index = this._rear;
          do {
              var influence = (index === this._front ? remainingInfluence : Math.pow(2, -iteration));
              remainingInfluence -= influence;
              score += this._memory[index].score * influence;
              if (index === this._front) {
                  break;
              }
              index = (this._capacity + index - 1) % this._capacity;
              iteration++;
          } while (true);
          return (score <= 0.5);
      };
      MouseWheelClassifier.prototype.accept = function (timestamp, deltaX, deltaY) {
          var item = new MouseWheelClassifierItem(timestamp, deltaX, deltaY);
          item.score = this._computeScore(item);
          if (this._front === -1 && this._rear === -1) {
              this._memory[0] = item;
              this._front = 0;
              this._rear = 0;
          }
          else {
              this._rear = (this._rear + 1) % this._capacity;
              if (this._rear === this._front) {
                  // Drop oldest
                  this._front = (this._front + 1) % this._capacity;
              }
              this._memory[this._rear] = item;
          }
      };
      /**
       * A score between 0 and 1 for `item`.
       *  - a score towards 0 indicates that the source appears to be a physical mouse wheel
       *  - a score towards 1 indicates that the source appears to be a touchpad or magic mouse, etc.
       */
      MouseWheelClassifier.prototype._computeScore = function (item) {
          if (Math.abs(item.deltaX) > 0 && Math.abs(item.deltaY) > 0) {
              // both axes exercised => definitely not a physical mouse wheel
              return 1;
          }
          var score = 0.5;
          var prev = (this._front === -1 && this._rear === -1 ? null : this._memory[this._rear]);
          if (prev) {
              // const deltaT = item.timestamp - prev.timestamp;
              // if (deltaT < 1000 / 30) {
              // 	// sooner than X times per second => indicator that this is not a physical mouse wheel
              // 	score += 0.25;
              // }
              // if (item.deltaX === prev.deltaX && item.deltaY === prev.deltaY) {
              // 	// equal amplitude => indicator that this is a physical mouse wheel
              // 	score -= 0.25;
              // }
          }
          if (Math.abs(item.deltaX - Math.round(item.deltaX)) > 0 || Math.abs(item.deltaY - Math.round(item.deltaY)) > 0) {
              // non-integer deltas => indicator that this is not a physical mouse wheel
              score += 0.25;
          }
          return Math.min(Math.max(score, 0), 1);
      };
      MouseWheelClassifier.INSTANCE = new MouseWheelClassifier();
      return MouseWheelClassifier;
  }());
  export { MouseWheelClassifier };
  var AbstractScrollableElement = /** @class */ (function (_super) {
      __extends(AbstractScrollableElement, _super);
      function AbstractScrollableElement(element, options, scrollable) {
          var _this = _super.call(this) || this;
          _this._onScroll = _this._register(new Emitter());
          _this.onScroll = _this._onScroll.event;
          element.style.overflow = 'hidden';
          _this._options = resolveOptions(options);
          _this._scrollable = scrollable;
          _this._register(_this._scrollable.onScroll(function (e) {
              _this._onDidScroll(e);
              _this._onScroll.fire(e);
          }));
          var scrollbarHost = {
              onMouseWheel: function (mouseWheelEvent) { return _this._onMouseWheel(mouseWheelEvent); },
              onDragStart: function () { return _this._onDragStart(); },
              onDragEnd: function () { return _this._onDragEnd(); },
          };
          _this._verticalScrollbar = _this._register(new VerticalScrollbar(_this._scrollable, _this._options, scrollbarHost));
          _this._horizontalScrollbar = _this._register(new HorizontalScrollbar(_this._scrollable, _this._options, scrollbarHost));
          _this._domNode = document.createElement('div');
          _this._domNode.className = 'monaco-scrollable-element ' + _this._options.className;
          _this._domNode.setAttribute('role', 'presentation');
          _this._domNode.style.position = 'relative';
          _this._domNode.style.overflow = 'hidden';
          _this._domNode.appendChild(element);
          _this._domNode.appendChild(_this._horizontalScrollbar.domNode.domNode);
          _this._domNode.appendChild(_this._verticalScrollbar.domNode.domNode);
          if (_this._options.useShadows) {
              _this._leftShadowDomNode = createFastDomNode(document.createElement('div'));
              _this._leftShadowDomNode.setClassName('shadow');
              _this._domNode.appendChild(_this._leftShadowDomNode.domNode);
              _this._topShadowDomNode = createFastDomNode(document.createElement('div'));
              _this._topShadowDomNode.setClassName('shadow');
              _this._domNode.appendChild(_this._topShadowDomNode.domNode);
              _this._topLeftShadowDomNode = createFastDomNode(document.createElement('div'));
              _this._topLeftShadowDomNode.setClassName('shadow top-left-corner');
              _this._domNode.appendChild(_this._topLeftShadowDomNode.domNode);
          }
          _this._listenOnDomNode = _this._options.listenOnDomNode || _this._domNode;
          _this._mouseWheelToDispose = [];
          _this._setListeningToMouseWheel(_this._options.handleMouseWheel);
          _this.onmouseover(_this._listenOnDomNode, function (e) { return _this._onMouseOver(e); });
          _this.onnonbubblingmouseout(_this._listenOnDomNode, function (e) { return _this._onMouseOut(e); });
          _this._hideTimeout = _this._register(new TimeoutTimer());
          _this._isDragging = false;
          _this._mouseIsOver = false;
          _this._shouldRender = true;
          _this._revealOnScroll = true;
          return _this;
      }
      AbstractScrollableElement.prototype.dispose = function () {
          this._mouseWheelToDispose = dispose(this._mouseWheelToDispose);
          _super.prototype.dispose.call(this);
      };
      /**
       * Get the generated 'scrollable' dom node
       */
      AbstractScrollableElement.prototype.getDomNode = function () {
          return this._domNode;
      };
      AbstractScrollableElement.prototype.getOverviewRulerLayoutInfo = function () {
          return {
              parent: this._domNode,
              insertBefore: this._verticalScrollbar.domNode.domNode,
          };
      };
      /**
       * Delegate a mouse down event to the vertical scrollbar.
       * This is to help with clicking somewhere else and having the scrollbar react.
       */
      AbstractScrollableElement.prototype.delegateVerticalScrollbarMouseDown = function (browserEvent) {
          this._verticalScrollbar.delegateMouseDown(browserEvent);
      };
      AbstractScrollableElement.prototype.getScrollDimensions = function () {
          return this._scrollable.getScrollDimensions();
      };
      AbstractScrollableElement.prototype.setScrollDimensions = function (dimensions) {
          this._scrollable.setScrollDimensions(dimensions);
      };
      /**
       * Update the class name of the scrollable element.
       */
      AbstractScrollableElement.prototype.updateClassName = function (newClassName) {
          this._options.className = newClassName;
          // Defaults are different on Macs
          if (platform.isMacintosh) {
              this._options.className += ' mac';
          }
          this._domNode.className = 'monaco-scrollable-element ' + this._options.className;
      };
      /**
       * Update configuration options for the scrollbar.
       * Really this is Editor.IEditorScrollbarOptions, but base shouldn't
       * depend on Editor.
       */
      AbstractScrollableElement.prototype.updateOptions = function (newOptions) {
          var massagedOptions = resolveOptions(newOptions);
          this._options.handleMouseWheel = massagedOptions.handleMouseWheel;
          this._options.mouseWheelScrollSensitivity = massagedOptions.mouseWheelScrollSensitivity;
          this._setListeningToMouseWheel(this._options.handleMouseWheel);
          if (!this._options.lazyRender) {
              this._render();
          }
      };
      // -------------------- mouse wheel scrolling --------------------
      AbstractScrollableElement.prototype._setListeningToMouseWheel = function (shouldListen) {
          var _this = this;
          var isListening = (this._mouseWheelToDispose.length > 0);
          if (isListening === shouldListen) {
              // No change
              return;
          }
          // Stop listening (if necessary)
          this._mouseWheelToDispose = dispose(this._mouseWheelToDispose);
          // Start listening (if necessary)
          if (shouldListen) {
              var onMouseWheel = function (browserEvent) {
                  var e = new StandardMouseWheelEvent(browserEvent);
                  _this._onMouseWheel(e);
              };
              this._mouseWheelToDispose.push(dom.addDisposableListener(this._listenOnDomNode, 'mousewheel', onMouseWheel));
              this._mouseWheelToDispose.push(dom.addDisposableListener(this._listenOnDomNode, 'DOMMouseScroll', onMouseWheel));
          }
      };
      AbstractScrollableElement.prototype._onMouseWheel = function (e) {
          var _a;
          var classifier = MouseWheelClassifier.INSTANCE;
          if (SCROLL_WHEEL_SMOOTH_SCROLL_ENABLED) {
              classifier.accept(Date.now(), e.deltaX, e.deltaY);
          }
          // console.log(`${Date.now()}, ${e.deltaY}, ${e.deltaX}`);
          if (e.deltaY || e.deltaX) {
              var deltaY = e.deltaY * this._options.mouseWheelScrollSensitivity;
              var deltaX = e.deltaX * this._options.mouseWheelScrollSensitivity;
              if (this._options.flipAxes) {
                  _a = [deltaX, deltaY], deltaY = _a[0], deltaX = _a[1];
              }
              // Convert vertical scrolling to horizontal if shift is held, this
              // is handled at a higher level on Mac
              var shiftConvert = !platform.isMacintosh && e.browserEvent && e.browserEvent.shiftKey;
              if ((this._options.scrollYToX || shiftConvert) && !deltaX) {
                  deltaX = deltaY;
                  deltaY = 0;
              }
              var futureScrollPosition = this._scrollable.getFutureScrollPosition();
              var desiredScrollPosition = {};
              if (deltaY) {
                  var desiredScrollTop = futureScrollPosition.scrollTop - SCROLL_WHEEL_SENSITIVITY * deltaY;
                  this._verticalScrollbar.writeScrollPosition(desiredScrollPosition, desiredScrollTop);
              }
              if (deltaX) {
                  var desiredScrollLeft = futureScrollPosition.scrollLeft - SCROLL_WHEEL_SENSITIVITY * deltaX;
                  this._horizontalScrollbar.writeScrollPosition(desiredScrollPosition, desiredScrollLeft);
              }
              // Check that we are scrolling towards a location which is valid
              desiredScrollPosition = this._scrollable.validateScrollPosition(desiredScrollPosition);
              if (futureScrollPosition.scrollLeft !== desiredScrollPosition.scrollLeft || futureScrollPosition.scrollTop !== desiredScrollPosition.scrollTop) {
                  var canPerformSmoothScroll = (SCROLL_WHEEL_SMOOTH_SCROLL_ENABLED
                      && this._options.mouseWheelSmoothScroll
                      && classifier.isPhysicalMouseWheel());
                  if (canPerformSmoothScroll) {
                      this._scrollable.setScrollPositionSmooth(desiredScrollPosition);
                  }
                  else {
                      this._scrollable.setScrollPositionNow(desiredScrollPosition);
                  }
                  this._shouldRender = true;
              }
          }
          if (this._options.alwaysConsumeMouseWheel || this._shouldRender) {
              e.preventDefault();
              e.stopPropagation();
          }
      };
      AbstractScrollableElement.prototype._onDidScroll = function (e) {
          this._shouldRender = this._horizontalScrollbar.onDidScroll(e) || this._shouldRender;
          this._shouldRender = this._verticalScrollbar.onDidScroll(e) || this._shouldRender;
          if (this._options.useShadows) {
              this._shouldRender = true;
          }
          if (this._revealOnScroll) {
              this._reveal();
          }
          if (!this._options.lazyRender) {
              this._render();
          }
      };
      /**
       * Render / mutate the DOM now.
       * Should be used together with the ctor option `lazyRender`.
       */
      AbstractScrollableElement.prototype.renderNow = function () {
          if (!this._options.lazyRender) {
              throw new Error('Please use `lazyRender` together with `renderNow`!');
          }
          this._render();
      };
      AbstractScrollableElement.prototype._render = function () {
          if (!this._shouldRender) {
              return;
          }
          this._shouldRender = false;
          this._horizontalScrollbar.render();
          this._verticalScrollbar.render();
          if (this._options.useShadows) {
              var scrollState = this._scrollable.getCurrentScrollPosition();
              var enableTop = scrollState.scrollTop > 0;
              var enableLeft = scrollState.scrollLeft > 0;
              this._leftShadowDomNode.setClassName('shadow' + (enableLeft ? ' left' : ''));
              this._topShadowDomNode.setClassName('shadow' + (enableTop ? ' top' : ''));
              this._topLeftShadowDomNode.setClassName('shadow top-left-corner' + (enableTop ? ' top' : '') + (enableLeft ? ' left' : ''));
          }
      };
      // -------------------- fade in / fade out --------------------
      AbstractScrollableElement.prototype._onDragStart = function () {
          this._isDragging = true;
          this._reveal();
      };
      AbstractScrollableElement.prototype._onDragEnd = function () {
          this._isDragging = false;
          this._hide();
      };
      AbstractScrollableElement.prototype._onMouseOut = function (e) {
          this._mouseIsOver = false;
          this._hide();
      };
      AbstractScrollableElement.prototype._onMouseOver = function (e) {
          this._mouseIsOver = true;
          this._reveal();
      };
      AbstractScrollableElement.prototype._reveal = function () {
          this._verticalScrollbar.beginReveal();
          this._horizontalScrollbar.beginReveal();
          this._scheduleHide();
      };
      AbstractScrollableElement.prototype._hide = function () {
          if (!this._mouseIsOver && !this._isDragging) {
              this._verticalScrollbar.beginHide();
              this._horizontalScrollbar.beginHide();
          }
      };
      AbstractScrollableElement.prototype._scheduleHide = function () {
          var _this = this;
          if (!this._mouseIsOver && !this._isDragging) {
              this._hideTimeout.cancelAndSet(function () { return _this._hide(); }, HIDE_TIMEOUT);
          }
      };
      return AbstractScrollableElement;
  }(Widget));
  export { AbstractScrollableElement };
  var ScrollableElement = /** @class */ (function (_super) {
      __extends(ScrollableElement, _super);
      function ScrollableElement(element, options) {
          var _this = this;
          options = options || {};
          options.mouseWheelSmoothScroll = false;
          var scrollable = new Scrollable(0, function (callback) { return dom.scheduleAtNextAnimationFrame(callback); });
          _this = _super.call(this, element, options, scrollable) || this;
          _this._register(scrollable);
          return _this;
      }
      ScrollableElement.prototype.setScrollPosition = function (update) {
          this._scrollable.setScrollPositionNow(update);
      };
      ScrollableElement.prototype.getScrollPosition = function () {
          return this._scrollable.getCurrentScrollPosition();
      };
      return ScrollableElement;
  }(AbstractScrollableElement));
  export { ScrollableElement };
  var SmoothScrollableElement = /** @class */ (function (_super) {
      __extends(SmoothScrollableElement, _super);
      function SmoothScrollableElement(element, options, scrollable) {
          return _super.call(this, element, options, scrollable) || this;
      }
      return SmoothScrollableElement;
  }(AbstractScrollableElement));
  export { SmoothScrollableElement };
  var DomScrollableElement = /** @class */ (function (_super) {
      __extends(DomScrollableElement, _super);
      function DomScrollableElement(element, options) {
          var _this = _super.call(this, element, options) || this;
          _this._element = element;
          _this.onScroll(function (e) {
              if (e.scrollTopChanged) {
                  _this._element.scrollTop = e.scrollTop;
              }
              if (e.scrollLeftChanged) {
                  _this._element.scrollLeft = e.scrollLeft;
              }
          });
          _this.scanDomNode();
          return _this;
      }
      DomScrollableElement.prototype.scanDomNode = function () {
          // widh, scrollLeft, scrollWidth, height, scrollTop, scrollHeight
          this.setScrollDimensions({
              width: this._element.clientWidth,
              scrollWidth: this._element.scrollWidth,
              height: this._element.clientHeight,
              scrollHeight: this._element.scrollHeight
          });
          this.setScrollPosition({
              scrollLeft: this._element.scrollLeft,
              scrollTop: this._element.scrollTop,
          });
      };
      return DomScrollableElement;
  }(ScrollableElement));
  export { DomScrollableElement };
  function resolveOptions(opts) {
      var result = {
          lazyRender: (typeof opts.lazyRender !== 'undefined' ? opts.lazyRender : false),
          className: (typeof opts.className !== 'undefined' ? opts.className : ''),
          useShadows: (typeof opts.useShadows !== 'undefined' ? opts.useShadows : true),
          handleMouseWheel: (typeof opts.handleMouseWheel !== 'undefined' ? opts.handleMouseWheel : true),
          flipAxes: (typeof opts.flipAxes !== 'undefined' ? opts.flipAxes : false),
          alwaysConsumeMouseWheel: (typeof opts.alwaysConsumeMouseWheel !== 'undefined' ? opts.alwaysConsumeMouseWheel : false),
          scrollYToX: (typeof opts.scrollYToX !== 'undefined' ? opts.scrollYToX : false),
          mouseWheelScrollSensitivity: (typeof opts.mouseWheelScrollSensitivity !== 'undefined' ? opts.mouseWheelScrollSensitivity : 1),
          mouseWheelSmoothScroll: (typeof opts.mouseWheelSmoothScroll !== 'undefined' ? opts.mouseWheelSmoothScroll : true),
          arrowSize: (typeof opts.arrowSize !== 'undefined' ? opts.arrowSize : 11),
          listenOnDomNode: (typeof opts.listenOnDomNode !== 'undefined' ? opts.listenOnDomNode : null),
          horizontal: (typeof opts.horizontal !== 'undefined' ? opts.horizontal : 1 /* Auto */),
          horizontalScrollbarSize: (typeof opts.horizontalScrollbarSize !== 'undefined' ? opts.horizontalScrollbarSize : 10),
          horizontalSliderSize: (typeof opts.horizontalSliderSize !== 'undefined' ? opts.horizontalSliderSize : 0),
          horizontalHasArrows: (typeof opts.horizontalHasArrows !== 'undefined' ? opts.horizontalHasArrows : false),
          vertical: (typeof opts.vertical !== 'undefined' ? opts.vertical : 1 /* Auto */),
          verticalScrollbarSize: (typeof opts.verticalScrollbarSize !== 'undefined' ? opts.verticalScrollbarSize : 10),
          verticalHasArrows: (typeof opts.verticalHasArrows !== 'undefined' ? opts.verticalHasArrows : false),
          verticalSliderSize: (typeof opts.verticalSliderSize !== 'undefined' ? opts.verticalSliderSize : 0)
      };
      result.horizontalSliderSize = (typeof opts.horizontalSliderSize !== 'undefined' ? opts.horizontalSliderSize : result.horizontalScrollbarSize);
      result.verticalSliderSize = (typeof opts.verticalSliderSize !== 'undefined' ? opts.verticalSliderSize : result.verticalScrollbarSize);
      // Defaults are different on Macs
      if (platform.isMacintosh) {
          result.className += ' mac';
      }
      return result;
  }
  