wcfsetup/install/files/js/3rdParty/codemirror/addon/display/placeholder.js

   1 (function(mod) {
   2   if (typeof exports == "object" && typeof module == "object") // CommonJS
   3     mod(require("../../lib/codemirror"));
   4   else if (typeof define == "function" && define.amd) // AMD
   5     define(["../../lib/codemirror"], mod);
   6   else // Plain browser env
   7     mod(CodeMirror);
   8 })(function(CodeMirror) {
   9   CodeMirror.defineOption("placeholder", "", function(cm, val, old) {
  10     var prev = old && old != CodeMirror.Init;
  11     if (val && !prev) {
  12       cm.on("blur", onBlur);
  13       cm.on("change", onChange);
  14       onChange(cm);
  15     } else if (!val && prev) {
  16       cm.off("blur", onBlur);
  17       cm.off("change", onChange);
  18       clearPlaceholder(cm);
  19       var wrapper = cm.getWrapperElement();
  20       wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
  21     }
  22
  23     if (val && !cm.hasFocus()) onBlur(cm);
  24   });
  25
  26   function clearPlaceholder(cm) {
  27     if (cm.state.placeholder) {
  28       cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
  29       cm.state.placeholder = null;
  30     }
  31   }
  32   function setPlaceholder(cm) {
  33     clearPlaceholder(cm);
  34     var elt = cm.state.placeholder = document.createElement("pre");
  35     elt.style.cssText = "height: 0; overflow: visible";
  36     elt.className = "CodeMirror-placeholder";
  37     elt.appendChild(document.createTextNode(cm.getOption("placeholder")));
  38     cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
  39   }
  40
  41   function onBlur(cm) {
  42     if (isEmpty(cm)) setPlaceholder(cm);
  43   }
  44   function onChange(cm) {
  45     var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
  46     wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
  47
  48     if (empty) setPlaceholder(cm);
  49     else clearPlaceholder(cm);
  50   }
  51
  52   function isEmpty(cm) {
  53     return (cm.lineCount() === 1) && (cm.getLine(0) === "");
  54   }
  55 });