tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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placeholder.js (2213B)

      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  CodeMirror.defineOption("placeholder", "", function(cm, val, old) {
     13    var prev = old && old != CodeMirror.Init;
     14    if (val && !prev) {
     15      cm.on("blur", onBlur);
     16      cm.on("change", onChange);
     17      cm.on("swapDoc", onChange);
     18      onChange(cm);
     19    } else if (!val && prev) {
     20      cm.off("blur", onBlur);
     21      cm.off("change", onChange);
     22      cm.off("swapDoc", onChange);
     23      clearPlaceholder(cm);
     24      var wrapper = cm.getWrapperElement();
     25      wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
     26    }
     27 
     28    if (val && !cm.hasFocus()) onBlur(cm);
     29  });
     30 
     31  function clearPlaceholder(cm) {
     32    if (cm.state.placeholder) {
     33      cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
     34      cm.state.placeholder = null;
     35    }
     36  }
     37  function setPlaceholder(cm) {
     38    clearPlaceholder(cm);
     39    var elt = cm.state.placeholder = document.createElement("pre");
     40    elt.style.cssText = "height: 0; overflow: visible";
     41    elt.style.direction = cm.getOption("direction");
     42    elt.className = "CodeMirror-placeholder CodeMirror-line-like";
     43    var placeHolder = cm.getOption("placeholder")
     44    if (typeof placeHolder == "string") placeHolder = document.createTextNode(placeHolder)
     45    elt.appendChild(placeHolder)
     46    cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
     47  }
     48 
     49  function onBlur(cm) {
     50    if (isEmpty(cm)) setPlaceholder(cm);
     51  }
     52  function onChange(cm) {
     53    var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
     54    wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
     55 
     56    if (empty) setPlaceholder(cm);
     57    else clearPlaceholder(cm);
     58  }
     59 
     60  function isEmpty(cm) {
     61    return (cm.lineCount() === 1) && (cm.getLine(0) === "");
     62  }
     63 });