64 lines
2.1 KiB
JavaScript
64 lines
2.1 KiB
JavaScript
|
// CodeMirror, copyright (c) by Marijn Haverbeke and others
|
||
|
|
// Distributed under an MIT license: https://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) {
|
||
|
|
CodeMirror.defineOption("placeholder", "", function(cm, val, old) {
|
||
|
|
var prev = old && old != CodeMirror.Init;
|
||
|
|
if (val && !prev) {
|
||
|
|
cm.on("blur", onBlur);
|
||
|
|
cm.on("change", onChange);
|
||
|
|
cm.on("swapDoc", onChange);
|
||
|
|
onChange(cm);
|
||
|
|
} else if (!val && prev) {
|
||
|
|
cm.off("blur", onBlur);
|
||
|
|
cm.off("change", onChange);
|
||
|
|
cm.off("swapDoc", onChange);
|
||
|
|
clearPlaceholder(cm);
|
||
|
|
var wrapper = cm.getWrapperElement();
|
||
|
|
wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
|
||
|
|
}
|
||
|
|
|
||
|
|
if (val && !cm.hasFocus()) onBlur(cm);
|
||
|
|
});
|
||
|
|
|
||
|
|
function clearPlaceholder(cm) {
|
||
|
|
if (cm.state.placeholder) {
|
||
|
|
cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
|
||
|
|
cm.state.placeholder = null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
function setPlaceholder(cm) {
|
||
|
|
clearPlaceholder(cm);
|
||
|
|
var elt = cm.state.placeholder = document.createElement("pre");
|
||
|
|
elt.style.cssText = "height: 0; overflow: visible";
|
||
|
|
elt.style.direction = cm.getOption("direction");
|
||
|
|
elt.className = "CodeMirror-placeholder";
|
||
|
|
var placeHolder = cm.getOption("placeholder")
|
||
|
|
if (typeof placeHolder == "string") placeHolder = document.createTextNode(placeHolder)
|
||
|
|
elt.appendChild(placeHolder)
|
||
|
|
cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
|
||
|
|
}
|
||
|
|
|
||
|
|
function onBlur(cm) {
|
||
|
|
if (isEmpty(cm)) setPlaceholder(cm);
|
||
|
|
}
|
||
|
|
function onChange(cm) {
|
||
|
|
var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
|
||
|
|
wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
|
||
|
|
|
||
|
|
if (empty) setPlaceholder(cm);
|
||
|
|
else clearPlaceholder(cm);
|
||
|
|
}
|
||
|
|
|
||
|
|
function isEmpty(cm) {
|
||
|
|
return (cm.lineCount() === 1) && (cm.getLine(0) === "");
|
||
|
|
}
|
||
|
|
});
|