HackMD/public/js/syncscroll.js
2015-07-02 20:30:43 +08:00

340 lines
No EOL
12 KiB
JavaScript

//
// Inject line numbers for sync scroll. Notes:
//
// - We track only headings and paragraphs on first level. That's enougth.
// - Footnotes content causes jumps. Level limit filter it automatically.
//
md.renderer.rules.blockquote_open = function (tokens, idx /*, options, env */ ) {
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<blockquote class="raw part" data-startline="' + startline + '" data-endline="' + endline + '">\n';
}
return '<blockquote>\n';
};
md.renderer.rules.table_open = function (tokens, idx /*, options, env */ ) {
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<table class="part" data-startline="' + startline + '" data-endline="' + endline + '">\n';
}
return '<table>\n';
};
md.renderer.rules.bullet_list_open = function (tokens, idx /*, options, env */ ) {
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<ul class="part" data-startline="' + startline + '" data-endline="' + endline + '">\n';
}
return '<ul>\n';
};
md.renderer.rules.ordered_list_open = function (tokens, idx /*, options, env */ ) {
var token = tokens[idx];
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<ol class="part" data-startline="' + startline + '" data-endline="' + endline + '"' + (token.order > 1 ? ' start="' + token.order + '"' : '') + '>\n';
}
return '<ol' + (token.order > 1 ? ' start="' + token.order + '"' : '') + '>\n';
};
md.renderer.rules.link_open = function (tokens, idx /*, options, env */ ) {
var title = tokens[idx].title ? (' title="' + Remarkable.utils.escapeHtml(Remarkable.utils.replaceEntities(tokens[idx].title)) + '"') : '';
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<a class="part" data-startline="' + startline + '" data-endline="' + endline + '" href="' + Remarkable.utils.escapeHtml(tokens[idx].href) + '"' + title + '>';
}
return '<a href="' + Remarkable.utils.escapeHtml(tokens[idx].href) + '"' + title + '>';
};
md.renderer.rules.paragraph_open = function (tokens, idx) {
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return tokens[idx].tight ? '' : '<p class="part" data-startline="' + startline + '" data-endline="' + endline + '">';
}
return tokens[idx].tight ? '' : '<p>';
};
md.renderer.rules.heading_open = function (tokens, idx) {
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<h' + tokens[idx].hLevel + ' class="part" data-startline="' + startline + '" data-endline="' + endline + '">';
}
return '<h' + tokens[idx].hLevel + '>';
};
md.renderer.rules.image = function (tokens, idx, options /*, env */ ) {
var src = ' src="' + Remarkable.utils.escapeHtml(tokens[idx].src) + '"';
var title = tokens[idx].title ? (' title="' + Remarkable.utils.escapeHtml(Remarkable.utils.replaceEntities(tokens[idx].title)) + '"') : '';
var alt = ' alt="' + (tokens[idx].alt ? Remarkable.utils.escapeHtml(Remarkable.utils.replaceEntities(tokens[idx].alt)) : '') + '"';
var suffix = options.xhtmlOut ? ' /' : '';
return '<img class="raw"' + src + alt + title + suffix + '>';
}
md.renderer.rules.fence = function (tokens, idx, options, env, self) {
var token = tokens[idx];
var langClass = '';
var langPrefix = options.langPrefix;
var langName = '',
fenceName;
var highlighted;
if (token.params) {
//
// ```foo bar
//
// Try custom renderer "foo" first. That will simplify overwrite
// for diagrams, latex, and any other fenced block with custom look
//
fenceName = token.params.split(/\s+/g)[0];
if (Remarkable.utils.has(self.rules.fence_custom, fenceName)) {
return self.rules.fence_custom[fenceName](tokens, idx, options, env, self);
}
langName = Remarkable.utils.escapeHtml(Remarkable.utils.replaceEntities(Remarkable.utils.unescapeMd(fenceName)));
langClass = ' class="' + langPrefix + langName.replace('=', '') + ' hljs"';
}
if (options.highlight) {
highlighted = options.highlight(token.content, langName) || Remarkable.utils.escapeHtml(token.content);
} else {
highlighted = Remarkable.utils.escapeHtml(token.content);
}
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<pre class="part" data-startline="' + startline + '" data-endline="' + endline + '"><code' + langClass + '>' + highlighted + '</code></pre>' + md.renderer.getBreak(tokens, idx);
}
return '<pre><code' + langClass + '>' + highlighted + '</code></pre>' + md.renderer.getBreak(tokens, idx);
};
md.renderer.rules.code = function (tokens, idx /*, options, env */ ) {
if (tokens[idx].block) {
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<pre class="part" data-startline="' + startline + '" data-endline="' + endline + '"><code>' + Remarkable.utils.escapeHtml(tokens[idx].content) + '</code></pre>' + md.renderer.getBreak(tokens, idx);
}
return '<pre><code>' + Remarkable.utils.escapeHtml(tokens[idx].content) + '</code></pre>' + md.renderer.getBreak(tokens, idx);
}
if (tokens[idx].lines && tokens[idx].level === 0) {
var startline = tokens[idx].lines[0] + 1;
var endline = tokens[idx].lines[1];
return '<code class="part" data-startline="' + startline + '" data-endline="' + endline + '">' + Remarkable.utils.escapeHtml(tokens[idx].content) + '</code>';
}
return '<code>' + Remarkable.utils.escapeHtml(tokens[idx].content) + '</code>';
};
//var editorScrollThrottle = 100;
var buildMapThrottle = 100;
var viewScrolling = false;
var viewScrollingDelay = 200;
var viewScrollingTimer = null;
//editor.on('scroll', _.throttle(syncScrollToView, editorScrollThrottle));
editor.on('scroll', syncScrollToView);
ui.area.view.on('scroll', function () {
viewScrolling = true;
clearTimeout(viewScrollingTimer);
viewScrollingTimer = setTimeout(function () {
viewScrolling = false;
}, viewScrollingDelay);
});
//editor.on('scroll', _.debounce(syncScrollToView, syncScrollDelay));
//ui.area.view.on('scroll', _.debounce(syncScrollToEdit, 50));
var scrollMap, lineHeightMap;
viewAjaxCallback = clearMap;
function clearMap() {
scrollMap = null;
lineHeightMap = null;
}
var buildMap = _.throttle(buildMapInner, buildMapThrottle);
// Build offsets for each line (lines can be wrapped)
// That's a bit dirty to process each line everytime, but ok for demo.
// Optimizations are required only for big texts.
function buildMapInner(syncBack) {
var i, offset, nonEmptyList, pos, a, b, _lineHeightMap, linesCount,
acc, sourceLikeDiv, textarea = ui.area.codemirror,
wrap = $('.CodeMirror-wrap pre'),
_scrollMap;
sourceLikeDiv = $('<div />').css({
position: 'absolute',
visibility: 'hidden',
height: 'auto',
width: wrap.width(),
'font-size': textarea.css('font-size'),
'font-family': textarea.css('font-family'),
'line-height': textarea.css('line-height'),
'word-wrap': wrap.css('word-wrap'),
'white-space': wrap.css('white-space'),
'word-break': wrap.css('word-break'),
'tab-size': '38px'
}).appendTo('body');
offset = ui.area.view.scrollTop() - ui.area.view.offset().top;
_scrollMap = [];
nonEmptyList = [];
_lineHeightMap = [];
acc = 0;
var lines = editor.getValue().split('\n');
var lineHeight = parseFloat(sourceLikeDiv.css('line-height'));
var div = sourceLikeDiv[0];
for (i = 0; i < lines.length; i++) {
var str = lines[i];
var h, lh;
_lineHeightMap.push(acc);
if (str.length === 0) {
acc++;
continue;
}
sourceLikeDiv.text(str);
h = parseFloat(div.clientHeight);
acc += Math.round(h / lineHeight);
}
sourceLikeDiv.remove();
_lineHeightMap.push(acc);
linesCount = acc;
for (i = 0; i < linesCount; i++) {
_scrollMap.push(-1);
}
nonEmptyList.push(0);
_scrollMap[0] = 0;
var parts = ui.area.markdown.find('.part').toArray();
for (i = 0; i < parts.length; i++) {
var $el = $(parts[i]),
t = $el.attr('data-startline') - 1;
if (t === '') {
return;
}
t = _lineHeightMap[t];
if (t !== 0) {
nonEmptyList.push(t);
}
_scrollMap[t] = Math.round($el.offset().top + offset);
}
nonEmptyList.push(linesCount);
_scrollMap[linesCount] = ui.area.view[0].scrollHeight;
pos = 0;
for (i = 1; i < linesCount; i++) {
if (_scrollMap[i] !== -1) {
pos++;
continue;
}
a = nonEmptyList[pos];
b = nonEmptyList[pos + 1];
_scrollMap[i] = Math.round((_scrollMap[b] * (i - a) + _scrollMap[a] * (b - i)) / (b - a));
}
_scrollMap[0] = 0;
scrollMap = _scrollMap;
lineHeightMap = _lineHeightMap;
if (loaded && syncBack)
syncScrollToView();
}
function getPartByEditorLineNo(lineNo) {
var part = null;
ui.area.markdown.find('.part').each(function (n, el) {
if (part) return;
var $el = $(el),
t = $el.data('startline') - 1,
f = $el.data('endline') - 1;
if (t === '' || f === '') {
return;
}
if (lineNo >= t && lineNo <= f) {
part = $el;
}
});
if (part)
return {
startline: part.data('startline') - 1,
endline: part.data('endline') - 1,
linediff: Math.abs(part.data('endline') - part.data('startline')) + 1,
element: part
};
else
return null;
}
function getEditorLineNoByTop(top) {
for (var i = 0; i < lineHeightMap.length; i++)
if (lineHeightMap[i] * editor.defaultTextHeight() > top)
return i;
return null;
}
function syncScrollToView(event, _lineNo) {
if (currentMode != modeType.both) return;
var lineNo, posTo;
var scrollInfo = editor.getScrollInfo();
if (!scrollMap || !lineHeightMap) {
buildMap(true);
return;
}
if (!_lineNo) {
var topDiffPercent, posToNextDiff;
var textHeight = editor.defaultTextHeight();
lineNo = Math.floor(scrollInfo.top / textHeight);
//if reach bottom, then scroll to end
if (scrollInfo.height > scrollInfo.clientHeight && scrollInfo.top + scrollInfo.clientHeight >= scrollInfo.height - defaultTextHeight) {
posTo = ui.area.view[0].scrollHeight - ui.area.view.height();
} else {
topDiffPercent = (scrollInfo.top % textHeight) / textHeight;
posTo = scrollMap[lineNo];
posToNextDiff = (scrollMap[lineNo + 1] - posTo) * topDiffPercent;
posTo += Math.floor(posToNextDiff);
}
} else {
if (viewScrolling) return;
posTo = scrollMap[lineHeightMap[_lineNo]];
}
var posDiff = Math.abs(ui.area.view.scrollTop() - posTo);
var duration = posDiff / 50;
ui.area.view.stop(true, true).animate({
scrollTop: posTo
}, duration >= 100 ? duration : 100, "linear");
/*
if (posDiff > scrollInfo.clientHeight / 5) {
var duration = posDiff / 50;
ui.area.view.stop(true, true).animate({
scrollTop: posTo
}, duration >= 100 ? duration : 100, "linear");
} else {
ui.area.view.stop(true, true).scrollTop(posTo);
}
*/
}