github.com/elliott5/community@v0.14.1-0.20160709191136-823126fb026a/app/public/codemirror/addon/scroll/annotatescrollbar.js (about)

     1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
     2  // Distributed under an MIT license: http://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("change", 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      function getY(pos, top) {
    76        if (curLine != pos.line) {
    77          curLine = pos.line;
    78          curLineObj = cm.getLineHandle(curLine);
    79        }
    80        if (wrapping && curLineObj.height > singleLineH)
    81          return cm.charCoords(pos, "local")[top ? "top" : "bottom"];
    82        var topY = cm.heightAtLine(curLineObj, "local");
    83        return topY + (top ? 0 : curLineObj.height);
    84      }
    85  
    86      if (cm.display.barWidth) for (var i = 0, nextTop; i < anns.length; i++) {
    87        var ann = anns[i];
    88        var top = nextTop || getY(ann.from, true) * hScale;
    89        var bottom = getY(ann.to, false) * hScale;
    90        while (i < anns.length - 1) {
    91          nextTop = getY(anns[i + 1].from, true) * hScale;
    92          if (nextTop > bottom + .9) break;
    93          ann = anns[++i];
    94          bottom = getY(ann.to, false) * hScale;
    95        }
    96        if (bottom == top) continue;
    97        var height = Math.max(bottom - top, 3);
    98  
    99        var elt = frag.appendChild(document.createElement("div"));
   100        elt.style.cssText = "position: absolute; right: 0px; width: " + Math.max(cm.display.barWidth - 1, 2) + "px; top: "
   101          + (top + this.buttonHeight) + "px; height: " + height + "px";
   102        elt.className = this.options.className;
   103        if (ann.id) {
   104          elt.setAttribute("annotation-id", ann.id);
   105        }
   106      }
   107      this.div.textContent = "";
   108      this.div.appendChild(frag);
   109    };
   110  
   111    Annotation.prototype.clear = function() {
   112      this.cm.off("refresh", this.resizeHandler);
   113      this.cm.off("markerAdded", this.resizeHandler);
   114      this.cm.off("markerCleared", this.resizeHandler);
   115      if (this.changeHandler) this.cm.off("change", this.changeHandler);
   116      this.div.parentNode.removeChild(this.div);
   117    };
   118  });