devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
823 lines (822 loc) • 40.8 kB
JavaScript
/**
* DevExtreme (ui/grid_core/ui.grid_core.virtual_scrolling.js)
* Version: 18.1.3
* Build date: Tue May 15 2018
*
* Copyright (c) 2012 - 2018 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
"use strict";
var $ = require("../../core/renderer"),
windowUtils = require("../../core/utils/window"),
window = windowUtils.getWindow(),
commonUtils = require("../../core/utils/common"),
virtualScrollingCore = require("./ui.grid_core.virtual_scrolling_core"),
gridCoreUtils = require("./ui.grid_core.utils"),
each = require("../../core/utils/iterator").each,
Deferred = require("../../core/utils/deferred").Deferred,
translator = require("../../animation/translator"),
LoadIndicator = require("../load_indicator");
var TABLE_CLASS = "table",
BOTTOM_LOAD_PANEL_CLASS = "bottom-load-panel",
TABLE_CONTENT_CLASS = "table-content",
GROUP_SPACE_CLASS = "group-space",
CONTENT_CLASS = "content",
ROW_CLASS = "dx-row",
FREESPACE_CLASS = "dx-freespace-row",
COLUMN_LINES_CLASS = "dx-column-lines",
SCROLLING_MODE_INFINITE = "infinite",
SCROLLING_MODE_VIRTUAL = "virtual",
SCROLLING_MODE_STANDARD = "standard",
PIXELS_LIMIT = 25e4;
var isVirtualMode = function(that) {
return that.option("scrolling.mode") === SCROLLING_MODE_VIRTUAL
};
var isAppendMode = function(that) {
return that.option("scrolling.mode") === SCROLLING_MODE_INFINITE
};
var isVirtualRowRendering = function(that) {
var rowRenderingMode = that.option("scrolling.rowRenderingMode");
if (rowRenderingMode === SCROLLING_MODE_VIRTUAL) {
return true
} else {
if (rowRenderingMode === SCROLLING_MODE_STANDARD) {
return false
}
}
};
var VirtualScrollingDataSourceAdapterExtender = function() {
var _updateLoading = function(that) {
var beginPageIndex = that._virtualScrollController.beginPageIndex(-1);
if (isVirtualMode(that)) {
if (beginPageIndex < 0 || that.viewportSize() >= 0 && that.getViewportItemIndex() >= 0 && (beginPageIndex * that.pageSize() > that.getViewportItemIndex() || beginPageIndex * that.pageSize() + that.itemsCount() < that.getViewportItemIndex() + that.viewportSize()) && that._dataSource.isLoading()) {
if (!that._isLoading) {
that._isLoading = true;
that.loadingChanged.fire(true)
}
} else {
if (that._isLoading) {
that._isLoading = false;
that.loadingChanged.fire(false)
}
}
}
};
var result = {
init: function(dataSource) {
var that = this;
that.callBase.apply(that, arguments);
that._items = [];
that._isLoaded = true;
that._virtualScrollController = new virtualScrollingCore.VirtualScrollController(that.component, {
pageSize: function() {
return that.pageSize()
},
totalItemsCount: function() {
return that.totalItemsCount()
},
hasKnownLastPage: function() {
return that.hasKnownLastPage()
},
pageIndex: function(index) {
return dataSource.pageIndex(index)
},
isLoading: function() {
return dataSource.isLoading() && !that.isCustomLoading()
},
pageCount: function() {
return that.pageCount()
},
load: function() {
return dataSource.load()
},
updateLoading: function() {
_updateLoading(that)
},
itemsCount: function() {
return that.itemsCount(true)
},
items: function() {
return dataSource.items()
},
viewportItems: function(items) {
if (items) {
that._items = items
}
return that._items
},
onChanged: function(e) {
that.changed.fire(e)
},
changingDuration: function(e) {
return that._renderTime || 0
}
})
},
_handleLoadingChanged: function(isLoading) {
var that = this;
if (!isVirtualMode(that)) {
that._isLoading = isLoading;
that.callBase.apply(that, arguments)
}
},
_handleLoadError: function() {
var that = this;
that._isLoading = false;
that.loadingChanged.fire(false);
that.callBase.apply(that, arguments)
},
_handleDataChanged: function() {
var callBase = this.callBase.bind(this);
this._virtualScrollController.handleDataChanged(callBase)
},
_customizeRemoteOperations: function(options, isReload, operationTypes) {
var that = this;
if (!that.option("legacyRendering") && isVirtualMode(that) && !operationTypes.reload && operationTypes.paging && that._renderTime < that.option("scrolling.renderingThreshold")) {
options.delay = void 0
}
that.callBase.apply(that, arguments)
},
items: function() {
return this._items
},
itemsCount: function(isBase) {
if (isBase) {
return this.callBase()
}
return this._virtualScrollController.itemsCount()
},
load: function(loadOptions) {
if (loadOptions) {
return this.callBase(loadOptions)
}
return this._virtualScrollController.load()
},
isLoading: function() {
return this._isLoading
},
isLoaded: function() {
return this._dataSource.isLoaded() && this._isLoaded
},
_changeRowExpandCore: function() {
var result = this.callBase.apply(this, arguments);
this._virtualScrollController.reset();
this.resetPagesCache();
_updateLoading(this);
return result
},
reload: function() {
this._dataSource.pageIndex(this.pageIndex());
var virtualScrollController = this._virtualScrollController;
if (virtualScrollController) {
var d = new Deferred;
this.callBase.apply(this, arguments).done(function(r) {
var delayDeferred = virtualScrollController._delayDeferred;
if (delayDeferred) {
delayDeferred.done(d.resolve).fail(d.reject)
} else {
d.resolve(r)
}
}).fail(d.reject);
return d
} else {
return this.callBase.apply(this, arguments)
}
},
refresh: function(options, isReload, operationTypes) {
var that = this,
storeLoadOptions = options.storeLoadOptions,
dataSource = that._dataSource;
if (isReload || operationTypes.reload) {
that._virtualScrollController.reset();
dataSource.items().length = 0;
that._isLoaded = false;
_updateLoading(that);
that._isLoaded = true;
if (isAppendMode(that)) {
that.pageIndex(0);
dataSource.pageIndex(0);
storeLoadOptions.pageIndex = 0;
storeLoadOptions.skip = 0
} else {
dataSource.pageIndex(that.pageIndex());
if (dataSource.paginate()) {
storeLoadOptions.skip = that.pageIndex() * that.pageSize()
}
}
}
return that.callBase.apply(that, arguments)
}
};
["virtualItemsCount", "getContentOffset", "getVirtualContentSize", "setContentSize", "setViewportPosition", "getViewportItemIndex", "setViewportItemIndex", "viewportSize", "viewportItemSize", "getItemSize", "pageIndex", "beginPageIndex", "endPageIndex", "loadIfNeed"].forEach(function(name) {
result[name] = function() {
var virtualScrollController = this._virtualScrollController;
return virtualScrollController[name].apply(virtualScrollController, arguments)
}
});
return result
}();
var VirtualScrollingRowsViewExtender = function() {
return {
init: function() {
var that = this,
dataController = that.getController("data");
that.callBase();
dataController.pageChanged.add(function() {
that.scrollToPage(dataController.pageIndex())
});
if (!that.option("legacyRendering") && dataController.pageIndex() > 0) {
var resizeHandler = function resizeHandler() {
that.resizeCompleted.remove(resizeHandler);
that.scrollToPage(dataController.pageIndex())
};
that.resizeCompleted.add(resizeHandler)
}
},
scrollToPage: function(pageIndex) {
var scrollPosition, that = this,
dataController = that._dataController,
pageSize = dataController ? dataController.pageSize() : 0;
if (isVirtualMode(that) || isAppendMode(that)) {
scrollPosition = pageIndex * pageSize * dataController.getItemSize()
} else {
scrollPosition = 0
}
that.scrollTo({
y: scrollPosition,
x: that._scrollLeft
})
},
_renderCore: function(e) {
var that = this,
startRenderDate = new Date;
that.callBase.apply(that, arguments);
that._updateContentPosition(true);
var dataSource = that._dataController._dataSource;
if (dataSource && e) {
var itemCount = e.items ? e.items.length : 20;
var viewportSize = that._dataController.viewportSize() || 20;
if (isVirtualRowRendering(that)) {
dataSource._renderTime = (new Date - startRenderDate) * viewportSize / itemCount
} else {
dataSource._renderTime = new Date - startRenderDate
}
}
},
_getRowElements: function(tableElement) {
var $rows = this.callBase(tableElement);
return $rows && $rows.not(".dx-virtual-row")
},
_renderContent: function(contentElement, tableElement) {
var that = this,
virtualItemsCount = that._dataController.virtualItemsCount();
if (virtualItemsCount && that.option("legacyRendering")) {
if (windowUtils.hasWindow()) {
tableElement.addClass(that.addWidgetPrefix(TABLE_CONTENT_CLASS))
}
if (!contentElement.children().length) {
contentElement.append(tableElement)
} else {
contentElement.children().first().replaceWith(tableElement)
}
if (1 === contentElement.children("table").length) {
contentElement.append(that._createTable());
that._contentHeight = 0
}
return contentElement
}
return that.callBase.apply(that, arguments)
},
_updateContent: function(tableElement, change) {
var contentTable, that = this,
contentElement = that._findContentElement(),
changeType = change && change.changeType;
if ("append" === changeType || "prepend" === changeType) {
contentTable = contentElement.children().first();
var $tBodies = tableElement.children("tbody");
if (!that.option("legacyRendering") && 1 === $tBodies.length) {
contentTable.children("tbody")["append" === changeType ? "append" : "prepend"]($tBodies.children())
} else {
$tBodies["append" === changeType ? "appendTo" : "prependTo"](contentTable)
}
tableElement.remove();
var $rowElements = that._getFreeSpaceRowElements(contentTable);
for (var i = 0; i < $rowElements.length - 1; i++) {
$rowElements.eq(i).remove()
}
if (change.removeCount) {
var rowElements = that._getRowElements(contentTable).toArray();
if ("append" === changeType) {
rowElements = rowElements.slice(0, change.removeCount)
} else {
rowElements = rowElements.slice(-change.removeCount)
}
rowElements.map(function(rowElement) {
return $(rowElement).remove()
})
}
} else {
that.callBase.apply(that, arguments)
}
that._updateBottomLoading()
},
_updateContentPosition: function(isRender) {
var that = this,
dataController = that._dataController,
rowHeight = that._rowHeight || 20;
dataController.viewportItemSize(rowHeight);
if (!that.option("legacyRendering") && (isVirtualMode(that) || isVirtualRowRendering(that))) {
if (!isRender) {
var rowHeights = that._getRowElements(that._tableElement).toArray().map(function(row) {
return row.getBoundingClientRect().height
});
dataController.setContentSize(rowHeights)
}
var top = dataController.getContentOffset("begin");
var bottom = dataController.getContentOffset("end");
var $body = that._tableElement.children("tbody");
$body.children(".dx-virtual-row").remove();
if (top) {
var $topRow = that._createEmptyRow().addClass("dx-virtual-row");
$topRow.prependTo($body.first()).css("height", top)
}
if (bottom) {
var $bottomRow = that._createEmptyRow().addClass("dx-virtual-row");
$bottomRow.appendTo($body.last()).css("height", bottom)
}
} else {
commonUtils.deferUpdate(function() {
that._updateContentPositionCore()
})
}
},
_updateContentPositionCore: function() {
var contentElement, contentHeight, top, $tables, $contentTable, virtualTable, isRenderVirtualTableContentRequired, that = this,
rowHeight = that._rowHeight || 20,
virtualItemsCount = that._dataController.virtualItemsCount();
if (virtualItemsCount) {
contentElement = that._findContentElement();
$tables = contentElement.children();
$contentTable = $tables.eq(0);
virtualTable = $tables.eq(1);
that._contentTableHeight = $contentTable[0].offsetHeight;
that._dataController.viewportItemSize(rowHeight);
that._dataController.setContentSize(that._contentTableHeight);
contentHeight = that._dataController.getVirtualContentSize();
top = that._dataController.getContentOffset();
commonUtils.deferRender(function() {
translator.move($contentTable, {
left: 0,
top: top
});
isRenderVirtualTableContentRequired = that._contentHeight !== contentHeight || 0 === contentHeight || !that._isTableLinesDisplaysCorrect(virtualTable) || !that._isColumnElementsEqual($contentTable.find("col"), virtualTable.find("col"));
if (isRenderVirtualTableContentRequired) {
that._contentHeight = contentHeight;
that._renderVirtualTableContent(virtualTable, contentHeight)
}
if (that._scrollTop < top && !that._isScrollByEvent && that._dataController.pageIndex() > 0) {
that.scrollTo({
top: top,
left: that._scrollLeft
})
}
})
}
},
_isTableLinesDisplaysCorrect: function(table) {
var hasColumnLines = table.find("." + COLUMN_LINES_CLASS).length > 0;
return hasColumnLines === this.option("showColumnLines")
},
_isColumnElementsEqual: function($columns, $virtualColumns) {
var result = $columns.length === $virtualColumns.length;
if (result) {
each($columns, function(index, element) {
if (element.style.width !== $virtualColumns[index].style.width) {
result = false;
return result
}
})
}
return result
},
_renderVirtualTableContent: function(container, height) {
var i, that = this,
columns = that._columnsController.getVisibleColumns(),
html = that._createColGroup(columns).prop("outerHTML"),
freeSpaceCellsHtml = "",
columnLinesClass = that.option("showColumnLines") ? COLUMN_LINES_CLASS : "",
createFreeSpaceRowHtml = function(height) {
return "<tr style='height:" + height + "px;' class='" + FREESPACE_CLASS + " " + ROW_CLASS + " " + columnLinesClass + "' >" + freeSpaceCellsHtml + "</tr>"
};
for (i = 0; i < columns.length; i++) {
var classes = that._getCellClasses(columns[i]),
classString = classes.length ? " class='" + classes.join(" ") + "'" : "";
freeSpaceCellsHtml += "<td" + classString + "/>"
}
while (height > PIXELS_LIMIT) {
html += createFreeSpaceRowHtml(PIXELS_LIMIT);
height -= PIXELS_LIMIT
}
html += createFreeSpaceRowHtml(height);
container.addClass(that.addWidgetPrefix(TABLE_CLASS));
container.html(html)
},
_getCellClasses: function(column) {
var classes = [],
cssClass = column.cssClass,
isExpandColumn = "expand" === column.command;
cssClass && classes.push(cssClass);
isExpandColumn && classes.push(this.addWidgetPrefix(GROUP_SPACE_CLASS));
return classes
},
_findBottomLoadPanel: function() {
var $element = this.element();
var $bottomLoadPanel = $element && $element.find("." + this.addWidgetPrefix(BOTTOM_LOAD_PANEL_CLASS));
if ($bottomLoadPanel && $bottomLoadPanel.length) {
return $bottomLoadPanel
}
},
_updateBottomLoading: function() {
var that = this,
scrollingMode = that.option("scrolling.mode"),
virtualMode = scrollingMode === SCROLLING_MODE_VIRTUAL,
appendMode = scrollingMode === SCROLLING_MODE_INFINITE,
showBottomLoading = !that._dataController.hasKnownLastPage() && that._dataController.isLoaded() && (virtualMode || appendMode),
bottomLoadPanelElement = that._findBottomLoadPanel();
if (showBottomLoading) {
if (!bottomLoadPanelElement) {
$("<div>").addClass(that.addWidgetPrefix(BOTTOM_LOAD_PANEL_CLASS)).append(that._createComponent($("<div>"), LoadIndicator).$element()).appendTo(that._findContentElement())
}
} else {
if (bottomLoadPanelElement) {
bottomLoadPanelElement.remove()
}
}
},
_handleScroll: function(e) {
var that = this;
if (that._hasHeight && that._rowHeight) {
that._dataController.setViewportPosition(e.scrollOffset.top)
}
that.callBase.apply(that, arguments)
},
_needUpdateRowHeight: function(itemsCount) {
var that = this;
return that.callBase.apply(that, arguments) || itemsCount > 0 && that.option("scrolling.mode") === SCROLLING_MODE_INFINITE
},
_updateRowHeight: function() {
var viewportHeight, that = this;
that.callBase.apply(that, arguments);
if (that._rowHeight) {
that._updateContentPosition();
viewportHeight = that._hasHeight ? that.element().outerHeight() : $(window).outerHeight();
that._dataController.viewportSize(Math.round(viewportHeight / that._rowHeight))
}
},
updateFreeSpaceRowHeight: function() {
var result = this.callBase.apply(this, arguments);
if (result) {
this._updateContentPosition()
}
return result
},
setLoading: function(isLoading, messageText) {
var that = this,
callBase = that.callBase,
dataController = that._dataController,
hasBottomLoadPanel = dataController.pageIndex() > 0 && dataController.isLoaded() && !!that._findBottomLoadPanel();
if (hasBottomLoadPanel) {
isLoading = false
}
callBase.call(that, isLoading, messageText)
},
_resizeCore: function() {
var that = this,
$element = that.element();
that.callBase();
if (that.component.$element() && !that._windowScroll && $element.closest(window.document).length) {
that._windowScroll = virtualScrollingCore.subscribeToExternalScrollers($element, function(scrollPos) {
if (!that._hasHeight && that._rowHeight) {
that._dataController.setViewportPosition(scrollPos)
}
}, that.component.$element());
that.on("disposing", function() {
that._windowScroll.dispose()
})
}
that.loadIfNeed()
},
loadIfNeed: function() {
var dataSource = this._dataController.dataSource();
if (dataSource && dataSource.loadIfNeed) {
dataSource.loadIfNeed()
}
},
setColumnWidths: function(widths) {
var $content, scrollable = this.getScrollable();
this.callBase.apply(this, arguments);
if ("virtual" === this.option("scrolling.mode")) {
$content = scrollable ? scrollable.$content() : this.element();
this.callBase(widths, $content.children("." + this.addWidgetPrefix(CONTENT_CLASS)).children(":not(." + this.addWidgetPrefix(TABLE_CONTENT_CLASS) + ")"))
}
},
dispose: function() {
clearTimeout(this._scrollTimeoutID);
this.callBase()
}
}
}();
module.exports = {
defaultOptions: function() {
return {
scrolling: {
timeout: 300,
updateTimeout: 300,
minTimeout: 0,
renderingThreshold: 150,
removeInvisiblePages: true,
rowPageSize: 5,
mode: "standard",
preloadEnabled: false,
rowRenderingMode: "standard"
}
}
},
extenders: {
dataSourceAdapter: VirtualScrollingDataSourceAdapterExtender,
controllers: {
data: function() {
var members = {
_refreshDataSource: function() {
this.callBase.apply(this, arguments);
this.initVirtualRows()
},
getRowPageSize: function() {
var rowPageSize = this.option("scrolling.rowPageSize"),
pageSize = this.pageSize();
return pageSize && pageSize < rowPageSize ? pageSize : rowPageSize
},
initVirtualRows: function() {
var that = this,
virtualRowsRendering = isVirtualRowRendering(that);
if ("virtual" !== that.option("scrolling.mode") && true !== virtualRowsRendering || false === virtualRowsRendering || that.option("legacyRendering") || !that.option("scrolling.rowPageSize")) {
that._visibleItems = null;
that._rowsScrollController = null;
return
}
that._rowPageIndex = Math.ceil(that.pageIndex() * that.pageSize() / that.getRowPageSize());
that._visibleItems = [];
that._rowsScrollController = new virtualScrollingCore.VirtualScrollController(that.component, {
pageSize: function() {
return that.getRowPageSize()
},
totalItemsCount: function() {
return isVirtualMode(that) ? that.totalItemsCount() : that._items.length
},
hasKnownLastPage: function() {
return true
},
pageIndex: function(index) {
if (void 0 !== index) {
that._rowPageIndex = index
}
return that._rowPageIndex
},
isLoading: function() {
return that.isLoading()
},
pageCount: function() {
return Math.ceil(this.totalItemsCount() / this.pageSize())
},
load: function() {
if (that._rowsScrollController.pageIndex() >= this.pageCount()) {
that._rowsScrollController.pageIndex(this.pageCount() - 1)
}
if (!that._rowsScrollController._dataSource.items().length) {
return
}
that._rowsScrollController.handleDataChanged(function(change) {
change = change || {};
change.changeType = change.changeType || "refresh";
change.items = change.items || that._visibleItems;
that._visibleItems.forEach(function(item, index) {
item.rowIndex = index
});
that._fireChanged(change)
})
},
updateLoading: function() {},
itemsCount: function() {
return that._rowsScrollController._dataSource.items().length
},
items: function() {
var dataSource = that.dataSource(),
virtualItemsCount = dataSource && dataSource.virtualItemsCount(),
begin = virtualItemsCount ? virtualItemsCount.begin : 0,
rowPageSize = that.getRowPageSize();
var skip = that._rowPageIndex * rowPageSize - begin;
var take = rowPageSize;
var result = that._items;
if (skip < 0) {
return []
}
if (skip) {
result = result.slice(skip)
}
if (take) {
result = result.slice(0, take)
}
return result
},
viewportItems: function(items) {
if (items) {
that._visibleItems = items
}
return that._visibleItems
},
onChanged: function() {},
changingDuration: function(e) {
var dataSource = that.dataSource();
return dataSource && dataSource._renderTime || 0
}
}, true);
if (that.isLoaded()) {
that._rowsScrollController.load()
}
},
_updateItemsCore: function(change) {
this.callBase.apply(this, arguments);
var rowsScrollController = this._rowsScrollController;
if (rowsScrollController) {
var visibleItems = this._visibleItems;
var isRefresh = "refresh" === change.changeType;
if (isRefresh || "append" === change.changeType || "prepend" === change.changeType) {
change.cancel = true;
isRefresh && rowsScrollController.reset();
rowsScrollController.load()
} else {
if ("update" === change.changeType) {
change.rowIndices.forEach(function(rowIndex, index) {
var changeType = change.changeTypes[index];
var newItem = change.items[index];
if ("update" === changeType) {
visibleItems[rowIndex] = newItem
} else {
if ("insert" === changeType) {
visibleItems.splice(rowIndex, 0, newItem)
} else {
if ("remove" === changeType) {
visibleItems.splice(rowIndex, 1)
}
}
}
})
}
visibleItems.forEach(function(item, index) {
item.rowIndex = index
})
}
}
},
_applyChange: function(change) {
var that = this,
items = change.items,
changeType = change.changeType,
removeCount = change.removeCount;
if (removeCount) {
for (var i = 0; i < removeCount + 1; i++) {
var item = that._items["prepend" === changeType ? that._items.length - 1 - i : i];
if (item && "data" !== item.rowType && "group" !== item.rowType) {
removeCount++
}
}
change.removeCount = removeCount
}
switch (changeType) {
case "prepend":
that._items.unshift.apply(that._items, items);
if (removeCount) {
that._items.splice(-removeCount)
}
break;
case "append":
that._items.push.apply(that._items, items);
if (removeCount) {
that._items.splice(0, removeCount)
}
break;
default:
that.callBase(change)
}
},
items: function() {
return this._visibleItems || this._items
},
getRowIndexDelta: function() {
var visibleItems = this._visibleItems;
if (visibleItems) {
return visibleItems && visibleItems[0] && this._items.indexOf(visibleItems[0]) || 0
}
return 0
},
getRowIndexOffset: function() {
var offset = 0,
dataSource = this.dataSource(),
rowsScrollController = this._rowsScrollController;
if (rowsScrollController) {
offset = rowsScrollController.beginPageIndex() * rowsScrollController._dataSource.pageSize()
} else {
if ("virtual" === this.option("scrolling.mode") && dataSource) {
offset = dataSource.beginPageIndex() * dataSource.pageSize()
}
}
return offset
},
viewportSize: function() {
var rowsScrollController = this._rowsScrollController;
rowsScrollController && rowsScrollController.viewportSize.apply(rowsScrollController, arguments);
var dataSource = this._dataSource;
return dataSource && dataSource.viewportSize.apply(dataSource, arguments)
},
viewportItemSize: function() {
var rowsScrollController = this._rowsScrollController;
rowsScrollController && rowsScrollController.viewportItemSize.apply(rowsScrollController, arguments);
var dataSource = this._dataSource;
return dataSource && dataSource.viewportItemSize.apply(dataSource, arguments)
},
setViewportPosition: function() {
var rowsScrollController = this._rowsScrollController,
dataSource = this._dataSource;
if (rowsScrollController) {
rowsScrollController.setViewportPosition.apply(rowsScrollController, arguments).done(function() {
dataSource && dataSource.setViewportItemIndex(rowsScrollController.getViewportItemIndex())
})
} else {
dataSource && dataSource.setViewportPosition.apply(dataSource, arguments)
}
},
setContentSize: function(sizes) {
var rowsScrollController = this._rowsScrollController;
rowsScrollController && rowsScrollController.setContentSize(sizes);
var dataSource = this._dataSource;
return dataSource && dataSource.setContentSize(sizes)
},
getItemSize: function() {
var rowsScrollController = this._rowsScrollController;
if (rowsScrollController) {
return rowsScrollController.getItemSize.apply(rowsScrollController, arguments)
}
var dataSource = this._dataSource;
return dataSource && dataSource.getItemSize.apply(dataSource, arguments)
},
getContentOffset: function() {
var rowsScrollController = this._rowsScrollController;
if (rowsScrollController) {
return rowsScrollController.getContentOffset.apply(rowsScrollController, arguments)
}
var dataSource = this._dataSource;
return dataSource && dataSource.getContentOffset.apply(dataSource, arguments)
}
};
gridCoreUtils.proxyMethod(members, "virtualItemsCount");
gridCoreUtils.proxyMethod(members, "getVirtualContentSize");
gridCoreUtils.proxyMethod(members, "setViewportItemIndex");
return members
}(),
resizing: {
resize: function() {
var result, that = this,
callBase = that.callBase;
if (!that.option("legacyRendering") && (isVirtualMode(that) || isVirtualRowRendering(that))) {
clearTimeout(that._resizeTimeout);
var diff = new Date - that._lastTime;
var updateTimeout = that.option("scrolling.updateTimeout");
if (that._lastTime && diff < updateTimeout) {
result = new Deferred;
that._resizeTimeout = setTimeout(function() {
callBase.apply(that).done(result.resolve).fail(result.reject);
that._lastTime = new Date
}, updateTimeout);
that._lastTime = new Date
} else {
result = callBase.apply(that);
if (that._dataController.isLoaded()) {
that._lastTime = new Date
}
}
} else {
result = callBase.apply(that)
}
return result
},
dispose: function() {
this.callBase.apply(this, arguments);
clearTimeout(this._resizeTimeout)
}
}
},
views: {
rowsView: VirtualScrollingRowsViewExtender
}
}
};