// Inject line numbers for sync scroll. function addPart(tokens, idx) { if (tokens[idx].map && tokens[idx].level === 0) { var startline = tokens[idx].map[0] + 1; var endline = tokens[idx].map[1]; tokens[idx].attrJoin('class', 'part'); tokens[idx].attrJoin('data-startline', startline); tokens[idx].attrJoin('data-endline', endline); } } md.renderer.rules.blockquote_open = function (tokens, idx, options, env, self) { tokens[idx].attrJoin('class', 'raw'); addPart(tokens, idx); return self.renderToken.apply(self, arguments); }; md.renderer.rules.table_open = function (tokens, idx, options, env, self) { addPart(tokens, idx); return self.renderToken.apply(self, arguments); }; md.renderer.rules.bullet_list_open = function (tokens, idx, options, env, self) { addPart(tokens, idx); return self.renderToken.apply(self, arguments); }; md.renderer.rules.list_item_open = function (tokens, idx, options, env, self) { tokens[idx].attrJoin('class', 'raw'); if (tokens[idx].map) { var startline = tokens[idx].map[0] + 1; var endline = tokens[idx].map[1]; tokens[idx].attrJoin('class', 'part'); tokens[idx].attrJoin('data-startline', startline); tokens[idx].attrJoin('data-endline', endline); } return self.renderToken.apply(self, arguments); }; md.renderer.rules.ordered_list_open = function (tokens, idx, options, env, self) { addPart(tokens, idx); return self.renderToken.apply(self, arguments); }; md.renderer.rules.link_open = function (tokens, idx, options, env, self) { addPart(tokens, idx); return self.renderToken.apply(self, arguments); }; md.renderer.rules.paragraph_open = function (tokens, idx, options, env, self) { addPart(tokens, idx); return self.renderToken.apply(self, arguments); }; md.renderer.rules.heading_open = function (tokens, idx, options, env, self) { tokens[idx].attrJoin('class', 'raw'); addPart(tokens, idx); return self.renderToken.apply(self, arguments); }; md.renderer.rules.fence = function (tokens, idx, options, env, self) { var token = tokens[idx], info = token.info ? md.utils.unescapeAll(token.info).trim() : '', langName = '', highlighted; if (info) { langName = info.split(/\s+/g)[0]; token.attrJoin('class', options.langPrefix + langName.replace(/\=$|\=\d+$|\=\+$/, '')); token.attrJoin('class', 'hljs'); } if (options.highlight) { highlighted = options.highlight(token.content, langName) || md.utils.escapeHtml(token.content); } else { highlighted = md.utils.escapeHtml(token.content); } if (highlighted.indexOf('' + highlighted + '\n'; } return '
'
        + highlighted
        + '
\n'; }; md.renderer.rules.code_block = function (tokens, idx, options, env, self) { if (tokens[idx].map && tokens[idx].level === 0) { var startline = tokens[idx].map[0] + 1; var endline = tokens[idx].map[1]; return '
' + md.utils.escapeHtml(tokens[idx].content) + '
\n'; } return '
' + md.utils.escapeHtml(tokens[idx].content) + '
\n'; }; function renderContainer(tokens, idx, options, env, self) { tokens[idx].attrJoin('role', 'alert'); tokens[idx].attrJoin('class', 'alert'); tokens[idx].attrJoin('class', 'alert-' + tokens[idx].info.trim()); addPart(tokens, idx); return self.renderToken.apply(self, arguments); } md.use(window.markdownitContainer, 'success', { render: renderContainer }); md.use(window.markdownitContainer, 'info', { render: renderContainer }); md.use(window.markdownitContainer, 'warning', { render: renderContainer }); md.use(window.markdownitContainer, 'danger', { render: renderContainer }); var syncscroll = true; var preventSyncScrollToEdit = false; var preventSyncScrollToView = false; var editScrollThrottle = 10; var viewScrollThrottle = 10; var buildMapThrottle = 100; var viewScrolling = false; var editScrolling = false; ui.area.codemirrorScroll.on('scroll', _.throttle(syncScrollToView, editScrollThrottle)); ui.area.view.on('scroll', _.throttle(syncScrollToEdit, viewScrollThrottle)); var scrollMap, lineHeightMap, viewTop, viewBottom; viewAjaxCallback = clearMap; function clearMap() { scrollMap = null; lineHeightMap = null; viewTop = null; viewBottom = 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(callback) { var i, offset, nonEmptyList, pos, a, b, _lineHeightMap, linesCount, acc, _scrollMap; offset = ui.area.view.scrollTop() - ui.area.view.offset().top; _scrollMap = []; nonEmptyList = []; _lineHeightMap = []; viewTop = 0; viewBottom = ui.area.view[0].scrollHeight - ui.area.view.height(); acc = 0; var lines = editor.getValue().split('\n'); var lineHeight = editor.defaultTextHeight(); for (i = 0; i < lines.length; i++) { var str = lines[i]; _lineHeightMap.push(acc); if (str.length === 0) { acc++; continue; } var h = editor.heightAtLine(i + 1) - editor.heightAtLine(i); acc += Math.round(h / lineHeight); } _lineHeightMap.push(acc); linesCount = acc; for (i = 0; i < linesCount; i++) { _scrollMap.push(-1); } nonEmptyList.push(0); // make the first line go top _scrollMap[0] = viewTop; var parts = ui.area.markdown.find('.part').toArray(); for (i = 0; i < parts.length; i++) { var $el = $(parts[i]), t = $el.attr('data-startline') - 1; if (t === '') { return; } t = _lineHeightMap[t]; if (t !== 0 && t !== nonEmptyList[nonEmptyList.length - 1]) { nonEmptyList.push(t); } _scrollMap[t] = Math.round($el.offset().top + offset - 10); } 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 && callback) callback(); } // sync view scroll progress to edit var viewScrollingTimer = null; function syncScrollToEdit(event, preventAnimate) { if (currentMode != modeType.both || !syncscroll) return; if (preventSyncScrollToEdit) { if (typeof preventSyncScrollToEdit === 'number') { preventSyncScrollToEdit--; } else { preventSyncScrollToEdit = false; } return; } if (!scrollMap || !lineHeightMap) { buildMap(function () { syncScrollToEdit(event, preventAnimate); }); return; } if (editScrolling) return; var scrollTop = ui.area.view[0].scrollTop; var lineIndex = 0; for (var i = 0, l = scrollMap.length; i < l; i++) { if (scrollMap[i] > scrollTop) { break; } else { lineIndex = i; } } var lineNo = 0; var lineDiff = 0; for (var i = 0, l = lineHeightMap.length; i < l; i++) { if (lineHeightMap[i] > lineIndex) { break; } else { lineNo = lineHeightMap[i]; lineDiff = lineHeightMap[i + 1] - lineNo; } } var posTo = 0; var topDiffPercent = 0; var posToNextDiff = 0; var scrollInfo = editor.getScrollInfo(); var textHeight = editor.defaultTextHeight(); var preLastLineHeight = scrollInfo.height - scrollInfo.clientHeight - textHeight; var preLastLineNo = Math.round(preLastLineHeight / textHeight); var preLastLinePos = scrollMap[preLastLineNo]; if (scrollInfo.height > scrollInfo.clientHeight && scrollTop >= preLastLinePos) { posTo = preLastLineHeight; topDiffPercent = (scrollTop - preLastLinePos) / (viewBottom - preLastLinePos); posToNextDiff = textHeight * topDiffPercent; posTo += Math.ceil(posToNextDiff); } else { posTo = lineNo * textHeight; topDiffPercent = (scrollTop - scrollMap[lineNo]) / (scrollMap[lineNo + lineDiff] - scrollMap[lineNo]); posToNextDiff = textHeight * lineDiff * topDiffPercent; posTo += Math.ceil(posToNextDiff); } if (preventAnimate) { ui.area.codemirrorScroll.scrollTop(posTo); } else { var posDiff = Math.abs(scrollInfo.top - posTo); var duration = posDiff / 50; duration = duration >= 100 ? duration : 100; ui.area.codemirrorScroll.stop(true, true).animate({ scrollTop: posTo }, duration, "linear"); } viewScrolling = true; clearTimeout(viewScrollingTimer); viewScrollingTimer = setTimeout(viewScrollingTimeoutInner, duration * 1.5); } function viewScrollingTimeoutInner() { viewScrolling = false; } // sync edit scroll progress to view var editScrollingTimer = null; function syncScrollToView(event, preventAnimate) { if (currentMode != modeType.both || !syncscroll) return; if (preventSyncScrollToView) { if (typeof preventSyncScrollToView === 'number') { preventSyncScrollToView--; } else { preventSyncScrollToView = false; } return; } if (!scrollMap || !lineHeightMap) { buildMap(function () { syncScrollToView(event, preventAnimate); }); return; } if (viewScrolling) return; var lineNo, posTo; var topDiffPercent, posToNextDiff; var scrollInfo = editor.getScrollInfo(); var textHeight = editor.defaultTextHeight(); lineNo = Math.floor(scrollInfo.top / textHeight); // if reach the last line, will start lerp to the bottom var diffToBottom = (scrollInfo.top + scrollInfo.clientHeight) - (scrollInfo.height - textHeight); if (scrollInfo.height > scrollInfo.clientHeight && diffToBottom > 0) { topDiffPercent = diffToBottom / textHeight; posTo = scrollMap[lineNo + 1]; posToNextDiff = (viewBottom - posTo) * topDiffPercent; posTo += Math.floor(posToNextDiff); } else { topDiffPercent = (scrollInfo.top % textHeight) / textHeight; posTo = scrollMap[lineNo]; posToNextDiff = (scrollMap[lineNo + 1] - posTo) * topDiffPercent; posTo += Math.floor(posToNextDiff); } if (preventAnimate) { ui.area.view.scrollTop(posTo); } else { var posDiff = Math.abs(ui.area.view.scrollTop() - posTo); var duration = posDiff / 50; duration = duration >= 100 ? duration : 100; ui.area.view.stop(true, true).animate({ scrollTop: posTo }, duration, "linear"); } editScrolling = true; clearTimeout(editScrollingTimer); editScrollingTimer = setTimeout(editScrollingTimeoutInner, duration * 1.5); } function editScrollingTimeoutInner() { editScrolling = false; }