78 lines
2.8 KiB
JavaScript
78 lines
2.8 KiB
JavaScript
// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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if (typeof exports == "object" && typeof module == "object") // CommonJS
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mod(require("../../lib/codemirror"));
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else if (typeof define == "function" && define.amd) // AMD
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define(["../../lib/codemirror"], mod);
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else // Plain browser env
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mod(CodeMirror);
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})(function(CodeMirror) {
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CodeMirror.defineOption("placeholder", "", function(cm, val, old) {
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var prev = old && old != CodeMirror.Init;
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if (val && !prev) {
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cm.on("blur", onBlur);
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cm.on("change", onChange);
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cm.on("swapDoc", onChange);
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CodeMirror.on(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose = function() { onComposition(cm) })
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onChange(cm);
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} else if (!val && prev) {
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cm.off("blur", onBlur);
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cm.off("change", onChange);
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cm.off("swapDoc", onChange);
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CodeMirror.off(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose)
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clearPlaceholder(cm);
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var wrapper = cm.getWrapperElement();
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wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
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}
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if (val && !cm.hasFocus()) onBlur(cm);
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});
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function clearPlaceholder(cm) {
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if (cm.state.placeholder) {
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cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
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cm.state.placeholder = null;
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}
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}
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function setPlaceholder(cm) {
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clearPlaceholder(cm);
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var elt = cm.state.placeholder = document.createElement("pre");
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elt.style.cssText = "height: 0; overflow: visible";
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elt.style.direction = cm.getOption("direction");
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elt.className = "CodeMirror-placeholder CodeMirror-line-like";
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var placeHolder = cm.getOption("placeholder")
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if (typeof placeHolder == "string") placeHolder = document.createTextNode(placeHolder)
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elt.appendChild(placeHolder)
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cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
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}
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function onComposition(cm) {
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setTimeout(function() {
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var empty = false
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if (cm.lineCount() == 1) {
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var input = cm.getInputField()
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empty = input.nodeName == "TEXTAREA" ? !cm.getLine(0).length
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: !/[^\u200b]/.test(input.querySelector(".CodeMirror-line").textContent)
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}
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if (empty) setPlaceholder(cm)
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else clearPlaceholder(cm)
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}, 20)
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}
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function onBlur(cm) {
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if (isEmpty(cm)) setPlaceholder(cm);
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}
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function onChange(cm) {
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var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
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wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
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if (empty) setPlaceholder(cm);
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else clearPlaceholder(cm);
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}
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function isEmpty(cm) {
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return (cm.lineCount() === 1) && (cm.getLine(0) === "");
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}
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});
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