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import Padding from './padding'; export default function Viewport(elementRoutines, buffer, element, viewportController, $rootScope, padding) { let topPadding = null; let bottomPadding = null; const viewport = viewportController && viewportController.viewport ? viewportController.viewport : angular.element(window); const container = viewportController && viewportController.container ? viewportController.container : undefined; const scope = viewportController && viewportController.scope ? viewportController.scope : $rootScope; viewport.css({ 'overflow-anchor': 'none', 'overflow-y': 'auto', 'display': 'block' }); function bufferPadding() { return viewport.outerHeight() * padding; // some extra space to initiate preload } angular.extend(viewport, { getScope() { return scope; }, createPaddingElements(template) { topPadding = new Padding(template); bottomPadding = new Padding(template); element.before(topPadding); element.after(bottomPadding); }, applyContainerStyle() { if (container && container !== viewport) { viewport.css('height', window.getComputedStyle(container[0]).height); } }, bottomDataPos() { let scrollHeight = viewport[0].scrollHeight; scrollHeight = scrollHeight != null ? scrollHeight : viewport[0].document.documentElement.scrollHeight; return scrollHeight - bottomPadding.height(); }, topDataPos() { return topPadding.height(); }, bottomVisiblePos() { return viewport.scrollTop() + viewport.outerHeight(); }, topVisiblePos() { return viewport.scrollTop(); }, insertElement(e, sibling) { return elementRoutines.insertElement(e, sibling \|\| topPadding); }, insertElementAnimated(e, sibling) { return elementRoutines.insertElementAnimated(e, sibling \|\| topPadding); }, shouldLoadBottom() { return !buffer.eof && viewport.bottomDataPos() < viewport.bottomVisiblePos() + bufferPadding(); }, clipBottom() { // clip the invisible items off the bottom let overage = 0; let overageHeight = 0; let itemHeight = 0; let emptySpaceHeight = viewport.bottomDataPos() - viewport.bottomVisiblePos() - bufferPadding(); for (let i = buffer.length - 1; i >= 0; i--) { itemHeight = buffer[i].element.outerHeight(true); if (overageHeight + itemHeight > emptySpaceHeight) { break; } bottomPadding.cache.add(buffer[i]); overageHeight += itemHeight; overage++; } if (overage > 0) { buffer.eof = false; buffer.remove(buffer.length - overage, buffer.length); buffer.next -= overage; viewport.adjustPadding(); } }, shouldLoadTop() { return !buffer.bof && (viewport.topDataPos() > viewport.topVisiblePos() - bufferPadding()); }, clipTop() { // clip the invisible items off the top let overage = 0; let overageHeight = 0; let itemHeight = 0; let emptySpaceHeight = viewport.topVisiblePos() - viewport.topDataPos() - bufferPadding(); for (let i = 0; i < buffer.length; i++) { itemHeight = buffer[i].element.outerHeight(true); if (overageHeight + itemHeight > emptySpaceHeight) { break; } topPadding.cache.add(buffer[i]); overageHeight += itemHeight; overage++; } if (overage > 0) { // we need to adjust top padding element before items are removed from top // to avoid strange behaviour of scroll bar during remove top items when we are at the very bottom topPadding.height(topPadding.height() + overageHeight); buffer.bof = false; buffer.remove(0, overage); buffer.first += overage; } }, adjustPadding() { if (!buffer.length) { return; } // precise heights calculation, items that were in buffer once let topPaddingHeight = topPadding.cache.reduce((summ, item) => summ + (item.index < buffer.first ? item.height : 0), 0); let bottomPaddingHeight = bottomPadding.cache.reduce((summ, item) => summ + (item.index >= buffer.next ? item.height : 0), 0); // average item height based on buffer data let visibleItemsHeight = buffer.reduce((summ, item) => summ + item.element.outerHeight(true), 0); let averageItemHeight = (visibleItemsHeight + topPaddingHeight + bottomPaddingHeight) / (buffer.maxIndex - buffer.minIndex + 1); // average heights calculation, items that have never been reached let adjustTopPadding = buffer.minIndexUser !== null && buffer.minIndex > buffer.minIndexUser; let adjustBottomPadding = buffer.maxIndexUser !== null && buffer.maxIndex < buffer.maxIndexUser; let topPaddingHeightAdd = adjustTopPadding ? (buffer.minIndex - buffer.minIndexUser) * averageItemHeight : 0; let bottomPaddingHeightAdd = adjustBottomPadding ? (buffer.maxIndexUser - buffer.maxIndex) * averageItemHeight : 0; // paddings combine adjustment topPadding.height(topPaddingHeight + topPaddingHeightAdd); bottomPadding.height(bottomPaddingHeight + bottomPaddingHeightAdd); }, adjustScrollTopAfterMinIndexSet(topPaddingHeightOld) { // additional scrollTop adjustment in case of datasource.minIndex external set if (buffer.minIndexUser !== null && buffer.minIndex > buffer.minIndexUser) { let diff = topPadding.height() - topPaddingHeightOld; viewport.scrollTop(viewport.scrollTop() + diff); } }, adjustScrollTopAfterPrepend(updates) { if (!updates.prepended.length) return; const height = buffer.effectiveHeight(updates.prepended); const paddingHeight = topPadding.height() - height; if (paddingHeight >= 0) { topPadding.height(paddingHeight); } else { topPadding.height(0); viewport.scrollTop(viewport.scrollTop() - paddingHeight); } }, resetTopPadding() { topPadding.height(0); topPadding.cache.clear(); }, resetBottomPadding() { bottomPadding.height(0); bottomPadding.cache.clear(); } }); return viewport; }

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