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Code Issues Releases Wiki Activity

new: [CodeMirror] Shows a placeholder whenever the textarea is empty

pull/85/head
Sami Mokaddem 2022-01-17 11:29:50 +01:00
parent 12d7607aae
commit aeaa833f64
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GPG Key ID: 164C473F627A06FA
3 changed files with 83 additions and 0 deletions
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1
templates/layout/default.php
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@ -52,6 +52,7 @@ $sidebarOpen = $loggedUser->user_settings_by_name_with_fallback['ui.sidebar.expa
<?= $this->Html->script('CodeMirror/addon/lint/json-lint') ?>
<?= $this->Html->script('CodeMirror/addon/edit/matchbrackets') ?>
<?= $this->Html->script('CodeMirror/addon/edit/closebrackets') ?>
<?= $this->Html->script('CodeMirror/addon/display/placeholder') ?>
<?= $this->Html->css('CodeMirror/codemirror') ?>
<?= $this->Html->css('CodeMirror/codemirror-additional') ?>
<?= $this->Html->css('CodeMirror/addon/hint/show-hint') ?>

4
webroot/css/CodeMirror/codemirror-additional.css
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@ -26,4 +26,8 @@
.CodeMirror-hints {
z-index: 1060 !important; /* Make sure hint is above modal */
}
.CodeMirror pre.CodeMirror-placeholder {
color: #999;
}

78
webroot/js/CodeMirror/addon/display/placeholder.js vendored Normal file
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@ -0,0 +1,78 @@
// 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);
CodeMirror.on(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose = function () { onComposition(cm) })
onChange(cm);
} else if (!val && prev) {
cm.off("blur", onBlur);
cm.off("change", onChange);
cm.off("swapDoc", onChange);
CodeMirror.off(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose)
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 CodeMirror-line-like";
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 onComposition(cm) {
setTimeout(function () {
var empty = false
if (cm.lineCount() == 1) {
var input = cm.getInputField()
empty = input.nodeName == "TEXTAREA" ? !cm.getLine(0).length
: !/[^\u200b]/.test(input.querySelector(".CodeMirror-line").textContent)
}
if (empty) setPlaceholder(cm)
else clearPlaceholder(cm)
}, 20)
}
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) === "");
}
});