src/vs/base/parts/quickinput/browser/quickInput.ts/QuickInputController/getUI
class QuickInputController:	private getUI() {
		if (this.ui) {
			return this.ui;
		}

		const container = dom.append(this.parentElement, $('.quick-input-widget.show-file-icons'));
		container.tabIndex = -1;
		container.style.display = 'none';

		const styleSheet = dom.createStyleSheet(container);

		const titleBar = dom.append(container, $('.quick-input-titlebar'));

		const leftActionBar = this._register(new ActionBar(titleBar));
		leftActionBar.domNode.classList.add('quick-input-left-action-bar');

		const title = dom.append(titleBar, $('.quick-input-title'));

		const rightActionBar = this._register(new ActionBar(titleBar));
		rightActionBar.domNode.classList.add('quick-input-right-action-bar');

		const description1 = dom.append(container, $('.quick-input-description'));
		const headerContainer = dom.append(container, $('.quick-input-header'));

		const checkAll = <HTMLInputElement>dom.append(headerContainer, $('input.quick-input-check-all'));
		checkAll.type = 'checkbox';
		this._register(dom.addStandardDisposableListener(checkAll, dom.EventType.CHANGE, e => {
			const checked = checkAll.checked;
			list.setAllVisibleChecked(checked);
		}));
		this._register(dom.addDisposableListener(checkAll, dom.EventType.CLICK, e => {
			if (e.x || e.y) { // Avoid 'click' triggered by 'space'...
				inputBox.setFocus();
			}
		}));

		const description2 = dom.append(headerContainer, $('.quick-input-description'));
		const extraContainer = dom.append(headerContainer, $('.quick-input-and-message'));
		const filterContainer = dom.append(extraContainer, $('.quick-input-filter'));

		const inputBox = this._register(new QuickInputBox(filterContainer));
		inputBox.setAttribute('aria-describedby', `${this.idPrefix}message`);

		const visibleCountContainer = dom.append(filterContainer, $('.quick-input-visible-count'));
		visibleCountContainer.setAttribute('aria-live', 'polite');
		visibleCountContainer.setAttribute('aria-atomic', 'true');
		const visibleCount = new CountBadge(visibleCountContainer, { countFormat: localize({ key: 'quickInput.visibleCount', comment: ['This tells the user how many items are shown in a list of items to select from. The items can be anything. Currently not visible, but read by screen readers.'] }, "{0} Results") });

		const countContainer = dom.append(filterContainer, $('.quick-input-count'));
		countContainer.setAttribute('aria-live', 'polite');
		const count = new CountBadge(countContainer, { countFormat: localize({ key: 'quickInput.countSelected', comment: ['This tells the user how many items are selected in a list of items to select from. The items can be anything.'] }, "{0} Selected") });

		const okContainer = dom.append(headerContainer, $('.quick-input-action'));
		const ok = new Button(okContainer);
		ok.label = localize('ok', "OK");
		this._register(ok.onDidClick(e => {
			this.onDidAcceptEmitter.fire();
		}));

		const customButtonContainer = dom.append(headerContainer, $('.quick-input-action'));
		const customButton = new Button(customButtonContainer);
		customButton.label = localize('custom', "Custom");
		this._register(customButton.onDidClick(e => {
			this.onDidCustomEmitter.fire();
		}));

		const message = dom.append(extraContainer, $(`#${this.idPrefix}message.quick-input-message`));

		const list = this._register(new QuickInputList(container, this.idPrefix + 'list', this.options));
		this._register(list.onChangedAllVisibleChecked(checked => {
			checkAll.checked = checked;
		}));
		this._register(list.onChangedVisibleCount(c => {
			visibleCount.setCount(c);
		}));
		this._register(list.onChangedCheckedCount(c => {
			count.setCount(c);
		}));
		this._register(list.onLeave(() => {
			// Defer to avoid the input field reacting to the triggering key.
			setTimeout(() => {
				inputBox.setFocus();
				if (this.controller instanceof QuickPick && this.controller.canSelectMany) {
					list.clearFocus();
				}
			}, 0);
		}));
		this._register(list.onDidChangeFocus(() => {
			if (this.comboboxAccessibility) {
				this.getUI().inputBox.setAttribute('aria-activedescendant', this.getUI().list.getActiveDescendant() || '');
			}
		}));

		const progressBar = new ProgressBar(container);
		progressBar.getContainer().classList.add('quick-input-progress');

		const focusTracker = dom.trackFocus(container);
		this._register(focusTracker);
		this._register(dom.addDisposableListener(container, dom.EventType.FOCUS, e => {
			this.previousFocusElement = e.relatedTarget instanceof HTMLElement ? e.relatedTarget : undefined;
		}, true));
		this._register(focusTracker.onDidBlur(() => {
			if (!this.getUI().ignoreFocusOut && !this.options.ignoreFocusOut()) {
				this.hide(QuickInputHideReason.Blur);
			}
			this.previousFocusElement = undefined;
		}));
		this._register(dom.addDisposableListener(container, dom.EventType.FOCUS, (e: FocusEvent) => {
			inputBox.setFocus();
		}));
		this._register(dom.addDisposableListener(container, dom.EventType.KEY_DOWN, (e: KeyboardEvent) => {
			const event = new StandardKeyboardEvent(e);
			switch (event.keyCode) {
				case KeyCode.Enter:
					dom.EventHelper.stop(e, true);
					this.onDidAcceptEmitter.fire();
					break;
				case KeyCode.Escape:
					dom.EventHelper.stop(e, true);
					this.hide(QuickInputHideReason.Gesture);
					break;
				case KeyCode.Tab:
					if (!event.altKey && !event.ctrlKey && !event.metaKey) {
						const selectors = ['.action-label.codicon'];
						if (container.classList.contains('show-checkboxes')) {
							selectors.push('input');
						} else {
							selectors.push('input[type=text]');
						}
						if (this.getUI().list.isDisplayed()) {
							selectors.push('.monaco-list');
						}
						const stops = container.querySelectorAll<HTMLElement>(selectors.join(', '));
						if (event.shiftKey && event.target === stops[0]) {
							dom.EventHelper.stop(e, true);
							stops[stops.length - 1].focus();
						} else if (!event.shiftKey && event.target === stops[stops.length - 1]) {
							dom.EventHelper.stop(e, true);
							stops[0].focus();
						}
					}
					break;
			}
		}));

		this.ui = {
			container,
			styleSheet,
			leftActionBar,
			titleBar,
			title,
			description1,
			description2,
			rightActionBar,
			checkAll,
			filterContainer,
			inputBox,
			visibleCountContainer,
			visibleCount,
			countContainer,
			count,
			okContainer,
			ok,
			message,
			customButtonContainer,
			customButton,
			list,
			progressBar,
			onDidAccept: this.onDidAcceptEmitter.event,
			onDidCustom: this.onDidCustomEmitter.event,
			onDidTriggerButton: this.onDidTriggerButtonEmitter.event,
			ignoreFocusOut: false,
			keyMods: this.keyMods,
			isScreenReaderOptimized: () => this.options.isScreenReaderOptimized(),
			show: controller => this.show(controller),
			hide: () => this.hide(),
			setVisibilities: visibilities => this.setVisibilities(visibilities),
			setComboboxAccessibility: enabled => this.setComboboxAccessibility(enabled),
			setEnabled: enabled => this.setEnabled(enabled),
			setContextKey: contextKey => this.options.setContextKey(contextKey),
		};
		this.updateStyles();
		return this.ui;
	}