tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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annotatescrollbar.js (4628B)

      1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
      2 // Distributed under an MIT license: https://codemirror.net/LICENSE
      3 
      4 (function(mod) {
      5  if (typeof exports == "object" && typeof module == "object") // CommonJS
      6    mod(require("../../lib/codemirror"));
      7  else if (typeof define == "function" && define.amd) // AMD
      8    define(["../../lib/codemirror"], mod);
      9  else // Plain browser env
     10    mod(CodeMirror);
     11 })(function(CodeMirror) {
     12  "use strict";
     13 
     14  CodeMirror.defineExtension("annotateScrollbar", function(options) {
     15    if (typeof options == "string") options = {className: options};
     16    return new Annotation(this, options);
     17  });
     18 
     19  CodeMirror.defineOption("scrollButtonHeight", 0);
     20 
     21  function Annotation(cm, options) {
     22    this.cm = cm;
     23    this.options = options;
     24    this.buttonHeight = options.scrollButtonHeight || cm.getOption("scrollButtonHeight");
     25    this.annotations = [];
     26    this.doRedraw = this.doUpdate = null;
     27    this.div = cm.getWrapperElement().appendChild(document.createElement("div"));
     28    this.div.style.cssText = "position: absolute; right: 0; top: 0; z-index: 7; pointer-events: none";
     29    this.computeScale();
     30 
     31    function scheduleRedraw(delay) {
     32      clearTimeout(self.doRedraw);
     33      self.doRedraw = setTimeout(function() { self.redraw(); }, delay);
     34    }
     35 
     36    var self = this;
     37    cm.on("refresh", this.resizeHandler = function() {
     38      clearTimeout(self.doUpdate);
     39      self.doUpdate = setTimeout(function() {
     40        if (self.computeScale()) scheduleRedraw(20);
     41      }, 100);
     42    });
     43    cm.on("markerAdded", this.resizeHandler);
     44    cm.on("markerCleared", this.resizeHandler);
     45    if (options.listenForChanges !== false)
     46      cm.on("changes", this.changeHandler = function() {
     47        scheduleRedraw(250);
     48      });
     49  }
     50 
     51  Annotation.prototype.computeScale = function() {
     52    var cm = this.cm;
     53    var hScale = (cm.getWrapperElement().clientHeight - cm.display.barHeight - this.buttonHeight * 2) /
     54      cm.getScrollerElement().scrollHeight
     55    if (hScale != this.hScale) {
     56      this.hScale = hScale;
     57      return true;
     58    }
     59  };
     60 
     61  Annotation.prototype.update = function(annotations) {
     62    this.annotations = annotations;
     63    this.redraw();
     64  };
     65 
     66  Annotation.prototype.redraw = function(compute) {
     67    if (compute !== false) this.computeScale();
     68    var cm = this.cm, hScale = this.hScale;
     69 
     70    var frag = document.createDocumentFragment(), anns = this.annotations;
     71 
     72    var wrapping = cm.getOption("lineWrapping");
     73    var singleLineH = wrapping && cm.defaultTextHeight() * 1.5;
     74    var curLine = null, curLineObj = null;
     75 
     76    function getY(pos, top) {
     77      if (curLine != pos.line) {
     78        curLine = pos.line
     79        curLineObj = cm.getLineHandle(pos.line)
     80        var visual = cm.getLineHandleVisualStart(curLineObj)
     81        if (visual != curLineObj) {
     82          curLine = cm.getLineNumber(visual)
     83          curLineObj = visual
     84        }
     85      }
     86      if ((curLineObj.widgets && curLineObj.widgets.length) ||
     87          (wrapping && curLineObj.height > singleLineH))
     88        return cm.charCoords(pos, "local")[top ? "top" : "bottom"];
     89      var topY = cm.heightAtLine(curLineObj, "local");
     90      return topY + (top ? 0 : curLineObj.height);
     91    }
     92 
     93    var lastLine = cm.lastLine()
     94    if (cm.display.barWidth) for (var i = 0, nextTop; i < anns.length; i++) {
     95      var ann = anns[i];
     96      if (ann.to.line > lastLine) continue;
     97      var top = nextTop || getY(ann.from, true) * hScale;
     98      var bottom = getY(ann.to, false) * hScale;
     99      while (i < anns.length - 1) {
    100        if (anns[i + 1].to.line > lastLine) break;
    101        nextTop = getY(anns[i + 1].from, true) * hScale;
    102        if (nextTop > bottom + .9) break;
    103        ann = anns[++i];
    104        bottom = getY(ann.to, false) * hScale;
    105      }
    106      if (bottom == top) continue;
    107      var height = Math.max(bottom - top, 3);
    108 
    109      var elt = frag.appendChild(document.createElement("div"));
    110      elt.style.cssText = "position: absolute; right: 0px; width: " + Math.max(cm.display.barWidth - 1, 2) + "px; top: "
    111        + (top + this.buttonHeight) + "px; height: " + height + "px";
    112      elt.className = this.options.className;
    113      if (ann.id) {
    114        elt.setAttribute("annotation-id", ann.id);
    115      }
    116    }
    117    this.div.textContent = "";
    118    this.div.appendChild(frag);
    119  };
    120 
    121  Annotation.prototype.clear = function() {
    122    this.cm.off("refresh", this.resizeHandler);
    123    this.cm.off("markerAdded", this.resizeHandler);
    124    this.cm.off("markerCleared", this.resizeHandler);
    125    if (this.changeHandler) this.cm.off("changes", this.changeHandler);
    126    this.div.parentNode.removeChild(this.div);
    127  };
    128 });