Pleets / SQLWebManager

public/lib/CodeMirror/addon/scroll/annotatescrollbar.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://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";

  CodeMirror.defineExtension("annotateScrollbar", function(options) {
    if (typeof options == "string") options = {className: options};
    return new Annotation(this, options);
  });

  CodeMirror.defineOption("scrollButtonHeight", 0);

  function Annotation(cm, options) {
    this.cm = cm;
    this.options = options;
    this.buttonHeight = options.scrollButtonHeight || cm.getOption("scrollButtonHeight");
    this.annotations = [];
    this.doRedraw = this.doUpdate = null;
    this.div = cm.getWrapperElement().appendChild(document.createElement("div"));
    this.div.style.cssText = "position: absolute; right: 0; top: 0; z-index: 7; pointer-events: none";
    this.computeScale();

    function scheduleRedraw(delay) {
      clearTimeout(self.doRedraw);
      self.doRedraw = setTimeout(function() { self.redraw(); }, delay);
    }

    var self = this;
    cm.on("refresh", this.resizeHandler = function() {
      clearTimeout(self.doUpdate);

The variable self is changed as part of the for loop for example by this on line 36. Only the value of the last iteration will be visible in this function if it is called after the loop.

      self.doUpdate = setTimeout(function() {
        if (self.computeScale()) scheduleRedraw(20);

The variable self is changed as part of the for loop for example by this on line 36. Only the value of the last iteration will be visible in this function if it is called after the loop.

      }, 100);
    });
    cm.on("markerAdded", this.resizeHandler);
    cm.on("markerCleared", this.resizeHandler);
    if (options.listenForChanges !== false)
      cm.on("change", this.changeHandler = function() {
        scheduleRedraw(250);
      });
  }

  Annotation.prototype.computeScale = function() {
    var cm = this.cm;
    var hScale = (cm.getWrapperElement().clientHeight - cm.display.barHeight - this.buttonHeight * 2) /
      cm.heightAtLine(cm.lastLine() + 1, "local");
    if (hScale != this.hScale) {
      this.hScale = hScale;
      return true;
    }
  };

  Annotation.prototype.update = function(annotations) {
    this.annotations = annotations;
    this.redraw();
  };

  Annotation.prototype.redraw = function(compute) {
    if (compute !== false) this.computeScale();
    var cm = this.cm, hScale = this.hScale;

    var frag = document.createDocumentFragment(), anns = this.annotations;

    var wrapping = cm.getOption("lineWrapping");
    var singleLineH = wrapping && cm.defaultTextHeight() * 1.5;
    var curLine = null, curLineObj = null;
    function getY(pos, top) {
      if (curLine != pos.line) {
        curLine = pos.line;
        curLineObj = cm.getLineHandle(curLine);
      }
      if (wrapping && curLineObj.height > singleLineH)
        return cm.charCoords(pos, "local")[top ? "top" : "bottom"];
      var topY = cm.heightAtLine(curLineObj, "local");
      return topY + (top ? 0 : curLineObj.height);
    }

    if (cm.display.barWidth) for (var i = 0, nextTop; i < anns.length; i++) {
      var ann = anns[i];
      var top = nextTop || getY(ann.from, true) * hScale;
      var bottom = getY(ann.to, false) * hScale;
      while (i < anns.length - 1) {
        nextTop = getY(anns[i + 1].from, true) * hScale;
        if (nextTop > bottom + .9) break;
        ann = anns[++i];
        bottom = getY(ann.to, false) * hScale;
      }
      if (bottom == top) continue;
      var height = Math.max(bottom - top, 3);

      var elt = frag.appendChild(document.createElement("div"));
      elt.style.cssText = "position: absolute; right: 0px; width: " + Math.max(cm.display.barWidth - 1, 2) + "px; top: "
        + (top + this.buttonHeight) + "px; height: " + height + "px";
      elt.className = this.options.className;
    }
    this.div.textContent = "";
    this.div.appendChild(frag);
  };

  Annotation.prototype.clear = function() {
    this.cm.off("refresh", this.resizeHandler);
    this.cm.off("markerAdded", this.resizeHandler);
    this.cm.off("markerCleared", this.resizeHandler);
    if (this.changeHandler) this.cm.off("change", this.changeHandler);
    this.div.parentNode.removeChild(this.div);
  };
});