Function validateFlatTree

tests/ListViewComponents/VirtualizeContentsViewTest.ts:83–126

(listView, expectedItemsPerBlock?)

    var defaultChunkSize, defaultMaxTime, defaultPagesToPrefetch;

    function validateFlatTree(listView, expectedItemsPerBlock?) {
        expectedItemsPerBlock = expectedItemsPerBlock || STRUCTURENODE_SIZE;

        var containers;

        LiveUnit.Assert.areEqual(1, listView.element.querySelectorAll(".win-itemscontainer").length);
        LiveUnit.Assert.areEqual(0, listView.element.querySelectorAll(".win-groupheadercontainer").length);

        if (!listView._view.tree[0].itemsContainer.itemsBlocks) {
            containers = listView.element.querySelectorAll(".win-container");

            LiveUnit.Assert.areEqual(listView.itemDataSource.list.length, containers.length);
            for (var i = 0, len = containers.length; i < len; i++) {
                var container = containers[i],
                    itemBox = container.firstElementChild;

                LiveUnit.Assert.areEqual(container, listView._view.containers[i]);

                if (itemBox) {
                    LiveUnit.Assert.isTrue(WinJS.Utilities.hasClass(itemBox, "win-itembox"));
                    LiveUnit.Assert.areEqual(listView.selection._isIncluded(i), WinJS.Utilities.hasClass(container, "win-selected"));
                    LiveUnit.Assert.areEqual(listView.selection._isIncluded(i), WinJS.Utilities.hasClass(itemBox, "win-selected"));
                } else {
                    LiveUnit.Assert.isFalse(WinJS.Utilities.hasClass(container, "win-selected"));
                }

                LiveUnit.Assert.areEqual(container, listView._view.tree[0].itemsContainer.items[i]);
            }

            LiveUnit.Assert.areEqual(containers.length - 1, listView._view.lastItemIndex());
        } else {
            var blocks = listView._view.tree[0].itemsContainer.itemsBlocks;
            for (var i = 0, itemIndex = 0, len = blocks.length; i < len; i++) {
                var block = blocks[i];

                LiveUnit.Assert.isTrue(i + 1 >= len || block.element.children.length === expectedItemsPerBlock);

                for (var n = 0; n < block.items.length; n++) {
                    LiveUnit.Assert.areEqual(listView._view.containers[itemIndex++], block.items[n]);
                }
            }
            verifyContainerStripesByIndex(listView);
        }
    }

    function verifyTreeUpdate(layout, validate, complete) {
        WinJS.UI._VirtualizeContentsView._chunkSize = 15;