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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Component,
Directive,
ElementRef,
EventEmitter,
Input,
OnChanges,
OnDestroy,
Output,
QueryList,
SimpleChanges,
TemplateRef,
ViewChild,
ViewChildren,
} from '@angular/core';
import {
Maybe,
isPrintableCharacter,
subscribe,
textToLine,
} from '../../utils/internal-utils';
import {
Callback,
Item,
ItemGroup,
Key,
MenuItemWithChildren,
hasSublabel,
} from '../../utils/util.types';
import { isItemGroup, itemTrack } from '../../utils/utilities';
import {
Alignment,
OverlayContainerComponent,
OverlayLocation,
} from '../overlay-container/overlay-container.component';
interface MenuItemsTemplateContext {
$implicit: Item[];
}
@Directive({
selector: 'ng-template[data-gc-menu-item]',
})
export class MenuItemsTemplateDirective {
constructor(
public readonly template: TemplateRef<MenuItemsTemplateContext>,
) {}
/**
* @ignore
*/
static ngTemplateContextGuard(
_dir: MenuItemsTemplateDirective,
ctx: unknown,
): ctx is MenuItemsTemplateContext {
return true;
}
}
let UNIQUE_ID = 0;
const ARIA_CONTROLS = 'aria-controls';
const ARIA_EXPANDED = 'aria-expanded';
const ARIA_HASPOPUP = 'aria-haspopup';
type BaseMenuItem<T> = T | MenuItemWithChildren<BaseMenuItem<T>>;
type MenuItemType<T> = readonly ItemGroup<T>[] | readonly BaseMenuItem<T>[];
/**
* A Menu element that opens a menu with multiple items as options.
*/
@Component({
selector: 'gc-menu',
templateUrl: './menu.component.html',
styleUrls: ['./menu.component.css'],
})
export class MenuComponent<T extends Item> implements OnDestroy, OnChanges {
/**
* Action that is fired when an menu item is pressed.
*/
@Output()
public readonly onAction: EventEmitter<T> = new EventEmitter<T>();
/**
* All items in the menu that are disabled.
*/
@Input()
public disabledItems: ReadonlySet<string> = new Set();
/**
* Number of pixels that the menu will be offset from the anchor.
*/
@Input()
public offset = 0;
/**
* Decides on which side of the menuOwner element the menu is going to appear.
*/
@Input()
public alignment: Alignment = 'end';
/**
* Decides upon which mouse event the menu will be triggered. In case of contextmenu the anchor element
* must have a position relative and it must be able to append child nodes
*/
@Input()
public mouseEventType: 'click' | 'contextmenu' = 'click';
/** Override the element which is used to label the menu, by default the menu owner is used. */
@Input()
public menuLabelledByOverride?: string;
/** Optional icon provider */
@Input()
public iconProvider?: TemplateRef<unknown>;
/**
* Optional stores the identifier of an item to be marked as currently selected
*/
@Input()
public selectedItem?: Key;
/** @ignore */
@Input()
protected parentReference?: {
parentMenu: MenuComponent<T>;
itemOwnerKey: Key;
};
/** @ignore */
@ViewChildren('menuitem')
protected menuItemElements!: QueryList<ElementRef<HTMLElement>>;
/** @ignore */
@ViewChild('menu')
protected menuContainer?: ElementRef<HTMLElement>;
/** @ignore */
@ViewChild('overlaycontainer', { static: true })
private overlayContainer?: OverlayContainerComponent;
/** @ignore */
@ViewChildren('submenu')
private submenuComponents?: QueryList<MenuComponent<T>>;
/**
* An element that acts as the menu owner and anchor.
*/
@Input()
public set menuOwner(
owner: ElementRef<HTMLElement> | HTMLElement | undefined,
) {
this._menuOwner =
owner === undefined || 'nativeElement' in owner
? owner
: new ElementRef(owner);
}
public get menuOwner(): ElementRef<HTMLElement> | undefined {
return this._menuOwner;
}
/**
* All items that will appear in the menu.
*/
@Input()
public get menuItems(): MenuItemType<T> {
return this._menuItems;
}
public set menuItems(items: MenuItemType<T>) {
this._menuItems = items;
if (items.length > 0) {
if (this._isItemGroup(items)) {
this._menuItemsHaveSublabels = items.some(
item => item.items.length > 0 && hasSublabel(item.items[0]),
);
} else {
this._menuItemsHaveSublabels = hasSublabel(items[0]);
}
} else {
this._menuItemsHaveSublabels = false;
}
}
/**
* @ignore
*/
get menuOpen(): boolean {
return this._menuOpen;
}
/**
* @ignore
*/
set menuOpen(menuOpen: boolean) {
this._menuOpen = menuOpen;
this.updateMenuOwnerAriaAttributes();
}
/**
* @ignore
*/
public _overlayLocation: OverlayLocation = 'end-bottom';
/**
* @ignore
*/
public readonly _menuId: string;
/**
* @ignore
*/
public _menuOwnerId: string;
/**
* @ignore
*/
public _menuOpen = false;
/** @ignore */
public _menuItemsHaveSublabels = false;
/** @ignore */
public _alignmentInternal: Alignment = 'end';
/**
* @ignore
*/
protected _offsetInternal = 0;
/**
* @ignore
*/
protected readonly menuComponent!: MenuComponent<T>;
/** @ignore */
private _menuOwner?: ElementRef<HTMLElement>;
/** @ignore */
private _currentSelectedItemIndex = -1;
/** @ignore */
private _menuItems: MenuItemType<T> = [];
/** @ignore */
private positionOverride = false;
/**
* @ignore
*/
private menuHasFocus = false;
/**
* @ignore
*/
private postPopupVisibleBlock: Callback | undefined;
/**
* @ignore
*/
private menuOwnerCleanupCallbacks: Callback[] = [];
/** @ignore */
private locationOverrideAnchor?: HTMLSpanElement;
constructor() {
this.menuComponent = this;
this._menuId = 'menu-' + UNIQUE_ID.toString();
this._menuOwnerId = 'menu-owner-' + UNIQUE_ID.toString();
UNIQUE_ID++;
}
/**
* @ignore
*/
ngOnChanges(changes: SimpleChanges): void {
if ('mouseEventType' in changes) {
this.initPositionOverride();
}
if ('menuOwner' in changes) {
this.initMenuOwner();
}
if (
'alignment' in changes ||
'mouseEventType' in changes ||
'offset' in changes
) {
this._alignmentInternal = this.alignment;
this._offsetInternal = this.offset;
}
if ('mouseEventType' in changes || 'menuOwner' in changes) {
this.determineOverlayContainerAnchor();
}
if (
(('selectedItem' in changes &&
changes.selectedItem.currentValue !== undefined) ||
'menuItems' in changes) &&
this._isItemGroup(this.menuItems) &&
this.selectedItem
) {
console.error(
'Selected Item is not supported together with grouped items in menu',
);
}
}
/**
* @ignore
*/
ngOnDestroy(): void {
this.cleanupLocationOverrideAnchor();
this.menuOwnerCleanupCallbacks.forEach(cleanup => cleanup());
}
/**
* @ignore
*/
protected _handlePopupVisible(): void {
if (this.postPopupVisibleBlock) {
this.postPopupVisibleBlock();
this.postPopupVisibleBlock = undefined;
}
}
/**
* @ignore
*/
protected _handleOwnerAction(event: MouseEvent): void {
if (this.menuOpen && !this.parentReference) {
this.closePopupMenu(true);
} else {
if (this.mouseEventType === 'contextmenu') {
this.handleContextMenuEvent(event);
}
this.openPopupMenu('first', true);
}
if (this.mouseEventType === 'contextmenu') {
event.preventDefault();
}
}
/**
* @ignore
*/
protected _handleOwnerHover(): void {
this.openPopupMenu('first', false);
}
/**
* @ignore
*/
protected _handleOwnerKeyDown(event: KeyboardEvent): void {
const key = event.key;
let flag = false;
if (this.mouseEventType !== 'contextmenu') {
switch (key) {
case 'ArrowDown':
flag = true;
this.openPopupMenu('first', true);
break;
case 'ArrowUp':
flag = true;
this.openPopupMenu('last', true);
break;
case 'Escape':
flag = true;
this.closePopupMenu(false);
break;
default:
if (this.menuOpen && isPrintableCharacter(key)) {
this.moveFocusToNextItemStartingWithChar(key);
flag = true;
}
break;
}
}
if (flag) {
event.stopPropagation();
event.preventDefault();
}
}
/**
* @ignore
*/
protected _itemTrackBy(_index: number, item: Item): string {
return itemTrack(item);
}
/**
* @ignore
*/
protected _handleOwnerBlur(): void {
if (!this.menuHasFocus) {
setTimeout(() => {
if (!this.menuHasFocus) {
this.closePopupMenu(false);
}
});
}
}
/**
* @ignore
*/
protected _handleMenuItemBlur(event: FocusEvent): void {
const relatedTargetIsMenuItemElement = this.menuItemElements.some(
el => el.nativeElement === event.relatedTarget,
);
this.menuHasFocus = relatedTargetIsMenuItemElement;
const relatedTargetIsChild = this.isFocusTargetRecursiveChild(
this,
event.relatedTarget,
);
if (!relatedTargetIsChild) {
const recursiveParentMenu = this.findRecursiveParentMenu(
this,
event.relatedTarget,
);
if (!relatedTargetIsMenuItemElement && this.menuOpen) {
recursiveParentMenu.closePopupMenu(event.relatedTarget === null);
}
}
}
/**
* @ignore
*/
protected _handleMenuItemFocus(): void {
this.menuHasFocus = true;
}
/**
* @ignore
*/
protected _handleMenuItemClick(itemKey: Key): void {
if (this._isItemDisabled(itemKey)) {
this.findItemByKey(itemKey).then(i => {
const idx = this.menuItems.findIndex(m => m === i);
if (idx >= 0) {
this._currentSelectedItemIndex = idx;
}
});
return;
}
this.handleMenuItemSelect(itemKey);
}
/**
* @ignore
*/
protected _handleMenuItemKeyDown(event: KeyboardEvent, itemKey: Key): void {
const key = event.key;
let flag = false;
switch (key) {
case 'Enter':
case ' ':
if (!this._isItemDisabled(itemKey)) {
this.handleMenuItemSelect(itemKey);
}
flag = true;
break;
case 'ArrowRight':
this.findItemByKey(itemKey).then(item => {
if (this.isItemHasChildren(item) && !this._isItemDisabled(itemKey)) {
this.handleMenuItemSelect(itemKey);
flag = true;
}
});
break;
case 'ArrowDown':
flag = true;
this.moveFocusToNextItem();
break;
case 'ArrowUp':
this.moveFocusToPrevItem();
flag = true;
break;
case 'Tab':
this.findRecursiveParentMenu(this, null).closePopupMenu(true);
break;
case 'Escape':
this.closePopupMenu(true);
flag = true;
break;
case 'ArrowLeft':
if (this.parentReference) {
this.closePopupMenu(true);
flag = true;
}
break;
case 'Home':
case 'PageUp':
this.moveFocusToFirstItem();
flag = true;
break;
case 'End':
case 'PageDown':
this.moveFocusToLastItem();
flag = true;
break;
default:
if (isPrintableCharacter(key)) {
this.moveFocusToNextItemStartingWithChar(key);
flag = true;
}
}
if (flag) {
event.stopPropagation();
event.preventDefault();
}
}
/**
* @ignore
*/
protected _handleHide(): void {
this.closePopupMenu(true);
}
/**
* @ignore
*/
protected _handleLocationChange(location: OverlayLocation): void {
this._overlayLocation = location;
}
/**
* @ignore
*/
protected _isItemDisabled(itemKey: Key) {
return this.disabledItems.has(itemKey);
}
/**
* @ignore
*/
protected _isItemSelected(itemKey: Key) {
return this.selectedItem === itemKey;
}
/**
* @ignore
*/
protected _processItemText(text: string) {
return textToLine(text, 32, '<br>');
}
/** @ignore */
protected _itemSublabelText(item: Item): string | undefined {
return hasSublabel(item) ? item.sublabel : undefined;
}
/**
* @ignore
*/
protected _isItemGroup(
items: MenuItemType<T>,
): items is readonly ItemGroup<T>[] {
const item = items[0];
return isItemGroup(item);
}
/**
* @ignore
*/
protected _hasAnyItemChildren(
items: MenuItemType<T>,
): items is readonly MenuItemWithChildren<T>[] {
return items.some(mi => this.isItemHasChildren(mi));
}
/**
* @ignore
*/
protected isItemHasChildren(
item: Item | ItemGroup<T> | MenuItemWithChildren<T>,
): item is MenuItemWithChildren<T> {
return 'children' in item;
}
/**
* @ignore
*/
protected isItemChildMenuOpen(itemKey: Key): boolean {
return (
this.submenuComponents?.some(
menu => menu.parentReference?.itemOwnerKey === itemKey && menu.menuOpen,
) ?? false
);
}
/**
* @ignore
*/
protected closePopupMenu(focusOwner: boolean): void {
this.menuOpen = false;
if (focusOwner) {
this.menuOwner?.nativeElement.focus();
}
const childSubmenu = this.submenuComponents?.find(el => el.menuOpen);
if (childSubmenu) {
childSubmenu.closePopupMenu(false);
}
}
/**
* @ignore
*/
protected onMenuItemAction(itemKey: T) {
this.onAction.emit(itemKey);
this.closePopupMenu(this.parentReference ? false : true);
}
private findRecursiveParentMenu(
menu: MenuComponent<T>,
focusTarget: EventTarget | null,
): MenuComponent<T> {
if (focusTarget !== null) {
const found = menu.parentReference?.parentMenu.menuItemElements.some(
el => el.nativeElement === focusTarget,
);
if (found) {
return menu;
}
}
const openedParentMenu =
menu.parentReference?.parentMenu.submenuComponents?.some(
el => el.menuOpen,
);
if (openedParentMenu && menu.parentReference) {
return this.findRecursiveParentMenu(
menu.parentReference.parentMenu,
focusTarget,
);
} else {
return menu;
}
}
private isFocusTargetRecursiveChild(
menu: MenuComponent<T>,
focusTarget: EventTarget | null,
): boolean {
const found = menu.menuItemElements.some(
el => el.nativeElement === focusTarget,
);
if (found) {
return true;
}
const openedSubmenu = menu.submenuComponents?.find(el => el.menuOpen);
if (openedSubmenu) {
return this.isFocusTargetRecursiveChild(openedSubmenu, focusTarget);
} else {
return false;
}
}
/**
* @ignore
*/
private handleContextMenuEvent(event: MouseEvent): void {
if (this.menuOwner) {
let menuOverrideAnchorLeft = 0;
let menuOverrideAnchorTop = 0;
const menuOwnerBounds =
this.menuOwner.nativeElement.getBoundingClientRect();
// checks if contextmenu event source is not a right mouse button & alignment === auto
if (event.button !== 2 && this.alignment === 'auto') {
this._alignmentInternal = 'middle';
menuOverrideAnchorLeft = menuOwnerBounds.width / 2;
menuOverrideAnchorTop = menuOwnerBounds.height / 2;
this._offsetInternal = this.offset;
} else {
this._alignmentInternal = this.alignment;
menuOverrideAnchorLeft = event.clientX - menuOwnerBounds.left;
menuOverrideAnchorTop = event.clientY - menuOwnerBounds.top;
this._offsetInternal = 0;
}
if (this.locationOverrideAnchor) {
this.locationOverrideAnchor.style.left = `${menuOverrideAnchorLeft.toFixed(0)}px`;
this.locationOverrideAnchor.style.top = `${menuOverrideAnchorTop.toFixed(0)}px`;
}
}
}
/**
* @ignore
*/
private openPopupMenu(select: 'first' | 'last', moveFocus: boolean): void {
const moveFocusMethod = () => {
if (this.selectedItem) {
this.moveFocusToSelectedItem();
} else if (select === 'first') {
this.moveFocusToFirstItem();
} else {
this.moveFocusToLastItem();
}
};
const openedSiblingMenu =
this.parentReference?.parentMenu.submenuComponents?.find(
sm => sm.menuOpen && sm._menuId !== this._menuId,
);
if (openedSiblingMenu) {
openedSiblingMenu.closePopupMenu(
!this.parentReference?.parentMenu.menuHasFocus,
);
}
if (!this.menuOpen) {
this._currentSelectedItemIndex = -1;
this.menuOpen = true;
if (moveFocus) {
this.postPopupVisibleBlock = () => {
setTimeout(() => {
moveFocusMethod();
});
};
}
} else if (moveFocus) {
moveFocusMethod();
}
}
/**
* @ignore
*/
private findItemByKey(itemKey: Key): Maybe<T> {
if (this._isItemGroup(this.menuItems)) {
const flatItems = this.menuItems.flatMap(i => i.items);
return Maybe.maybe(flatItems.find(item => item.key === itemKey));
} else {
return Maybe.maybe(
this.menuItems
.flatMap(i => i as unknown as T)
.find(item => item.key === itemKey),
);
}
}
/**
* @ignore
*/
private handleMenuItemSelect(itemKey: Key) {
this.findItemByKey(itemKey).then(item => {
if (!this.isItemHasChildren(item)) {
this.closePopupMenu(true);
this.findItemByKey(itemKey).then(
this.onAction.emit.bind(this.onAction),
);
} else {
this.submenuComponents
?.find(menu => menu.parentReference?.itemOwnerKey === itemKey)
?.openPopupMenu('first', true);
}
});
}
/**
* @ignore
*/
private moveFocusToIndex(index: number) {
this._currentSelectedItemIndex = index;
this.menuItemElements.get(index)?.nativeElement.focus();
}
/**
* @ignore
*/
private moveFocusToFirstItem(): void {
const idx = this.findNextFocusIndex(-1);
if (idx >= 0) {
this.moveFocusToIndex(idx);
}
}
/**
* @ignore
*/
private moveFocusToLastItem(): void {
const idx = this.findPrevFocusIndex(this.menuItemElements.length);
if (idx >= 0) {
this.moveFocusToIndex(idx);
}
}
/**
* @ignore
*/
private moveFocusToNextItem(): void {
const idx = this.findNextFocusIndex(this._currentSelectedItemIndex);
if (idx >= this.menuItemElements.length) {
this.moveFocusToFirstItem();
} else {
this.moveFocusToIndex(idx);
}
}
/**
* @ignore
*/
private moveFocusToSelectedItem(): void {
if (this.selectedItem === undefined) {
this.moveFocusToFirstItem();
} else {
const idx = this.menuItems.findIndex(v => this.selectedItem === v.key);
if (idx >= 0) {
this.moveFocusToIndex(idx);
}
}
}
/**
* @ignore
*/
private moveFocusToPrevItem(): void {
const idx = this.findPrevFocusIndex(this._currentSelectedItemIndex);
if (idx === -1) {
this.moveFocusToLastItem();
} else {
this.moveFocusToIndex(idx);
}
}
/**
* @ignore
*/
private moveFocusToNextItemStartingWithChar(char: string): void {
let idx = -1;
if (this._isItemGroup(this.menuItems)) {
const flatItems = this.menuItems.flatMap(i => i.items);
idx = this.findItemIndexByItemStartingWithChar(char, flatItems);
} else {
idx = this.findItemIndexByItemStartingWithChar(char, this.menuItems);
}
if (idx !== -1) {
this.moveFocusToIndex(idx);
}
}
/**
* @ignore
*/
private findItemIndexByItemStartingWithChar(
char: string,
items: MenuItemType<T>,
): number {
let idx = items.findIndex((item, indx) => {
return (
indx > this._currentSelectedItemIndex &&
!this._isItemDisabled(item.key) &&
item.label.toLocaleLowerCase().startsWith(char.toLocaleLowerCase())
);
});
if (idx === -1) {
idx = items.findIndex((item, indx) => {
return (
indx <= this._currentSelectedItemIndex &&
!this._isItemDisabled(item.key) &&
item.label.toLocaleLowerCase().startsWith(char.toLocaleLowerCase())
);
});
}
return idx;
}
/**
* @ignore
*/
private findNextFocusIndex(start: number): number {
return start + 1;
}
/**
* @ignore
*/
private findPrevFocusIndex(end: number) {
return end - 1;
}
/**
* @ignore
*/
private updateMenuOwnerAriaAttributes(): void {
if (this.menuOwner && this.mouseEventType !== 'contextmenu') {
const menuOwnerElement = this.menuOwner.nativeElement;
if (this.menuOpen) {
menuOwnerElement.setAttribute(ARIA_CONTROLS, this._menuId);
menuOwnerElement.setAttribute(ARIA_EXPANDED, 'true');
} else {
menuOwnerElement.removeAttribute(ARIA_CONTROLS);
menuOwnerElement.setAttribute(ARIA_EXPANDED, 'false');
}
}
}
/**
* @ignore
*/
private updateMenuOwnerId(): void {
if (this.menuOwner) {
const existingMenuOwnerId =
this.menuOwner.nativeElement.getAttribute('id');
if (existingMenuOwnerId) {
this._menuOwnerId = existingMenuOwnerId;
} else {
this.menuOwner.nativeElement.setAttribute('id', this._menuOwnerId);
}
}
}
/**
* @ignore
*/
private determineOverlayContainerAnchor(): void {
this.cleanupLocationOverrideAnchor();
if (this.overlayContainer) {
if (this.positionOverride && this.menuOwner) {
this.locationOverrideAnchor = document.createElement('span');
this.menuOwner.nativeElement.appendChild(this.locationOverrideAnchor);
this.locationOverrideAnchor.style.position = 'absolute';
this.overlayContainer.anker = this.locationOverrideAnchor;
void this.overlayContainer._handleAttach();
} else {
this.overlayContainer.anker = this.menuOwner;
}
}
}
private cleanupLocationOverrideAnchor() {
if (this.locationOverrideAnchor?.parentNode) {
this.locationOverrideAnchor.parentNode.removeChild(
this.locationOverrideAnchor,
);
this.locationOverrideAnchor = undefined;
}
}
/**
* @ignore
*/
private initMenuOwner(): void {
this.menuOwnerCleanupCallbacks.forEach(cleanup => cleanup());
this.menuOwnerCleanupCallbacks = [];
if (this.menuOwner) {
const menuOwnerElement = this.menuOwner.nativeElement;
if (this.parentReference === undefined) {
this.menuOwnerCleanupCallbacks.push(
subscribe(
menuOwnerElement,
this.mouseEventType,
this._handleOwnerAction.bind(this),
),
subscribe(menuOwnerElement, 'blur', this._handleOwnerBlur.bind(this)),
subscribe(
menuOwnerElement,
'keydown',
this._handleOwnerKeyDown.bind(this),
),
);
} else {
this.menuOwnerCleanupCallbacks.push(
subscribe(
menuOwnerElement,
'mouseover',
this._handleOwnerHover.bind(this),
),
);
}
if (this.mouseEventType !== 'contextmenu') {
menuOwnerElement.setAttribute(ARIA_HASPOPUP, 'menu');
this.menuOwnerCleanupCallbacks.push(() => {
menuOwnerElement.removeAttribute(ARIA_HASPOPUP);
menuOwnerElement.removeAttribute(ARIA_CONTROLS);
menuOwnerElement.removeAttribute(ARIA_EXPANDED);
});
}
this.updateMenuOwnerId();
this.updateMenuOwnerAriaAttributes();
}
}
/**
* @ignore
*/
private initPositionOverride(): void {
if (this.mouseEventType === 'contextmenu') {
this.positionOverride = true;
} else {
this.positionOverride = false;
}
}
}
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