TypeScript arrays.range函數代碼示例

	test('all rows get disposed', function () {
		const element = document.createElement('div');
		element.style.height = '200px';
		element.style.width = '200px';

		const delegate: IVirtualDelegate<number> = {
			getHeight() { return 20; },
			getTemplateId() { return 'template'; }
		};

		let templatesCount = 0;

		const renderer: IRenderer<number, void> = {
			templateId: 'template',
			renderTemplate() { templatesCount++; },
			renderElement() { },
			disposeElement() { },
			disposeTemplate() { templatesCount--; }
		};

		const listView = new ListView<number>(element, delegate, [renderer]);
		listView.layout(200);

		assert.equal(templatesCount, 0, 'no templates have been allocated');
		listView.splice(0, 0, range(100));
		assert.equal(templatesCount, 10, 'some templates have been allocated');
		listView.dispose();
		assert.equal(templatesCount, 0, 'all templates have been disposed');
	});

		handler: (accessor) => {
			const focused = accessor.get(IListService).lastFocusedList;

			// List
			if (focused instanceof List || focused instanceof PagedList) {
				const list = focused;
				list.setSelection(range(list.length));
			}
		}

	set model(model: IPagedModel<T>) {
		this._model = model;
		this.list.splice(0, this.list.length, range(model.length));
	}

	handler: (accessor) => {
		const focused = accessor.get(IListService).lastFocusedList;

		// List
		if (focused instanceof List || focused instanceof PagedList) {
			const list = focused;
			list.setSelection(range(list.length));
		}

		// Trees
		else if (focused instanceof ObjectTree || focused instanceof DataTree || focused instanceof AsyncDataTree) {
			const tree = focused;
			const focus = tree.getFocus();
			const selection = tree.getSelection();

			// Which element should be considered to start selecting all?
			let start: unknown | undefined = undefined;

			if (focus.length > 0 && (selection.length === 0 || selection.indexOf(focus[0]) === -1)) {
				start = focus[0];
			}

			if (!start && selection.length > 0) {
				start = selection[0];
			}

			// What is the scope of select all?
			let scope: unknown | undefined = undefined;

			if (!start) {
				scope = undefined;
			} else {
				const selectedNode = tree.getNode(start);
				const parentNode = selectedNode.parent;

				if (!parentNode || !parentNode.parent) { // root
					scope = undefined;
				} else {
					scope = parentNode.element;
				}
			}

			const newSelection: unknown[] = [];
			const visit = (node: ITreeNode<unknown, unknown>) => {
				for (const child of node.children) {
					if (child.visible) {
						newSelection.push(child.element);

						if (!child.collapsed) {
							visit(child);
						}
					}
				}
			};

			// Add the whole scope subtree to the new selection
			visit(tree.getNode(scope));

			// If the scope isn't the tree root, it should be part of the new selection
			if (scope && selection.length === newSelection.length) {
				newSelection.unshift(scope);
			}

			const fakeKeyboardEvent = new KeyboardEvent('keydown');
			tree.setSelection(newSelection, fakeKeyboardEvent);
		}
	}