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Updated the markdown editor to use codemirror as editor

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Improved scroll sync system to be smarter
This commit is contained in:
Dan Brown 2017-05-28 16:02:46 +01:00
parent e5fc6bf5fa
commit 88f93f76dd
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GPG Key ID: 46D9F943C24A2EF9
4 changed files with 70 additions and 39 deletions
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17
resources/assets/js/code.js
View File

@ -37,3 +37,20 @@ module.exports.highlight = function() {
};
module.exports.markdownEditor = function(elem) {
let content = elem.textContent;
let cm = CodeMirror(function(elt) {
elem.parentNode.insertBefore(elt, elem);
elem.style.display = 'none';
}, {
value: content,
mode: "markdown",
lineNumbers: true,
theme: 'base16-light',
lineWrapping: true
});
return cm;
};

72
resources/assets/js/directives.js
View File

@ -2,6 +2,7 @@
const DropZone = require("dropzone");
const MarkdownIt = require("markdown-it");
const mdTasksLists = require('markdown-it-task-lists');
const code = require('./code');
module.exports = function (ngApp, events) {
@ -233,19 +234,41 @@ module.exports = function (ngApp, events) {
// Set initial model content
element = element.find('textarea').first();
let content = element.val();
scope.mdModel = content;
scope.mdChange(md.render(content));
element.on('change input', (event) => {
content = element.val();
// Codemirror Setup
let cm = code.markdownEditor(element[0]);
cm.on('change', (instance, changeObj) => {
update(instance);
});
cm.on('scroll', instance => {
// Thanks to http://liuhao.im/english/2015/11/10/the-sync-scroll-of-markdown-editor-in-javascript.html
let scroll = instance.getScrollInfo();
let atEnd = scroll.top + scroll.clientHeight === scroll.height;
if (atEnd) {
scope.$emit('markdown-scroll', -1);
return;
}
let lineNum = instance.lineAtHeight(scroll.top, 'local');
let range = instance.getRange({line: 0, ch: null}, {line: lineNum, ch: null});
let parser = new DOMParser();
let doc = parser.parseFromString(md.render(range), 'text/html');
let totalLines = doc.documentElement.querySelectorAll('body > *');
scope.$emit('markdown-scroll', totalLines.length);
});
function update(instance) {
let content = instance.getValue();
element.val(content);
$timeout(() => {
scope.mdModel = content;
scope.mdChange(md.render(content));
});
});
}
update(cm);
scope.$on('markdown-update', (event, value) => {
cm.setValue(value);
element.val(value);
scope.mdModel = value;
scope.mdChange(md.render(value));
@ -259,7 +282,7 @@ module.exports = function (ngApp, events) {
* Markdown Editor
* Handles all functionality of the markdown editor.
*/
ngApp.directive('markdownEditor', ['$timeout', function ($timeout) {
ngApp.directive('markdownEditor', ['$timeout', '$rootScope', function ($timeout, $rootScope) {
return {
restrict: 'A',
link: function (scope, element, attrs) {
@ -282,34 +305,15 @@ module.exports = function (ngApp, events) {
currentCaretPos = $input[0].selectionStart;
});
// Scroll sync
let inputScrollHeight,
inputHeight,
displayScrollHeight,
displayHeight;
function setScrollHeights() {
inputScrollHeight = $input[0].scrollHeight;
inputHeight = $input.height();
displayScrollHeight = $display[0].scrollHeight;
displayHeight = $display.height();
}
setTimeout(() => {
setScrollHeights();
}, 200);
window.addEventListener('resize', setScrollHeights);
let scrollDebounceTime = 800;
let lastScroll = 0;
$input.on('scroll', event => {
let now = Date.now();
if (now - lastScroll > scrollDebounceTime) {
setScrollHeights()
// Handle scroll sync event from editor scroll
$rootScope.$on('markdown-scroll', (event, lineCount) => {
let elems = $display[0].children[0].children;
if (elems.length > lineCount) {
let topElem = (lineCount === -1) ? elems[elems.length-1] : elems[lineCount];
$display.animate({
scrollTop: topElem.offsetTop
}, {queue: false, duration: 200, easing: 'linear'});
}
let scrollPercent = ($input.scrollTop() / (inputScrollHeight - inputHeight));
let displayScrollY = (displayScrollHeight - displayHeight) * scrollPercent;
$display.scrollTop(displayScrollY);
lastScroll = now;
});
// Editor key-presses

13
resources/assets/sass/_codemirror.scss
View File

@ -350,7 +350,7 @@ span.CodeMirror-selectedtext { background: none; }
*/
.cm-s-base16-light.CodeMirror { background: #f5f5f5; color: #202020; }
.cm-s-base16-light.CodeMirror { background: #f8f8f8; color: #444444; }
.cm-s-base16-light div.CodeMirror-selected { background: #e0e0e0; }
.cm-s-base16-light .CodeMirror-line::selection, .cm-s-base16-light .CodeMirror-line > span::selection, .cm-s-base16-light .CodeMirror-line > span > span::selection { background: #e0e0e0; }
.cm-s-base16-light .CodeMirror-line::-moz-selection, .cm-s-base16-light .CodeMirror-line > span::-moz-selection, .cm-s-base16-light .CodeMirror-line > span > span::-moz-selection { background: #e0e0e0; }
@ -388,4 +388,13 @@ span.CodeMirror-selectedtext { background: none; }
margin-bottom: $-l;
border: 1px solid #DDD;;
}
.cm-s-base16-light .CodeMirror-gutters { background: #f5f5f5; border-right: 1px solid #DDD; }
.cm-s-base16-light .CodeMirror-gutters { background: #f5f5f5; border-right: 1px solid #DDD; }
.flex-fill .CodeMirror {
position: absolute;
top: 0;
bottom: 0;
left: 0;
width: 100%;
height: 100%;
}

7
resources/assets/sass/_grid.scss
View File

@ -11,16 +11,17 @@ body.flexbox {
#content {
flex: 1;
display: flex;
min-height: 0px;
min-height: 0;
}
}
.flex-fill {
display: flex;
align-items: stretch;
min-height: 0px;
min-height: 0;
position: relative;
.flex, &.flex {
min-height: 0px;
min-height: 0;
flex: 1;
}
}