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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterContentChecked,
AfterContentInit,
AfterViewInit,
ChangeDetectorRef,
Component,
ContentChild,
Directive,
ElementRef,
EventEmitter,
HostListener,
Input,
NgZone,
OnChanges,
OnDestroy,
Output,
QueryList,
SimpleChanges,
TemplateRef,
ViewChild,
ViewChildren,
} from '@angular/core';
import { subscribe } from '../utils/internal-utils';
import { isGecko, isWebkit } from '../utils/user-agent';
import {
Callback,
FocusableElementOwner,
Item,
ItemGroup,
Key,
StructuredControlState,
TreeItem,
WidgetKeySet,
} from '../utils/util.types';
import {
createWidgetKeySet,
isTreeItem,
isTreeItemBasic,
itemTrack,
} from '../utils/utilities';
import { BaseTreeComponent } from './base-tree.component';
const KEYBOARD_SCROLL_AMOUNT = 100;
const LOADING_TEXT_INIT_READ_DELAY = 2000;
const LOADING_TEXT_READ_INTERVAL = 10000;
interface RecursiveTreeItemTemplateContext<T> {
$implicit: RecursiveTreeItem<T>[];
level: number;
}
@Directive({
selector: '[data-gc-tree-item]',
})
export class TreeItemDirective<
T,
I extends TreeItem<unknown> = RecursiveTreeItem<T>,
>
implements AfterContentInit, AfterContentChecked, OnDestroy
{
@Input('data-gc-tree-item')
public item!: I;
@ContentChild('arrowContainer')
private arrowContainer?: ElementRef<HTMLElement>;
@ContentChild('menuButton')
private menuButton?: ElementRef<HTMLElement>;
public readonly nativeElement: HTMLElement;
private prevMenuButton?: HTMLElement;
private subscriptionCallbacks: Callback[] = [];
constructor(
element: ElementRef<HTMLElement>,
private zone: NgZone,
) {
this.nativeElement = element.nativeElement;
}
ngAfterContentChecked() {
if (this.prevMenuButton !== this.menuButton?.nativeElement) {
this.prevMenuButton = this.menuButton?.nativeElement;
this.removeHoverListeners();
this.initHoverListeners();
}
}
ngAfterContentInit(): void {
this.initHoverListeners();
}
ngOnDestroy(): void {
this.removeHoverListeners();
}
public initHoverListeners(): void {
this.zone.runOutsideAngular(() => {
if (this.arrowContainer) {
this.subscriptionCallbacks.push(
subscribe(
this.arrowContainer.nativeElement,
'mouseover',
this.mouseOverCallback.bind(this),
),
subscribe(
this.arrowContainer.nativeElement,
'mouseout',
this.mouseOutCallback.bind(this),
),
);
}
if (this.menuButton) {
this.subscriptionCallbacks.push(
subscribe(
this.menuButton.nativeElement,
'mouseover',
this.mouseOverCallback.bind(this),
),
subscribe(
this.menuButton.nativeElement,
'mouseout',
this.mouseOutCallback.bind(this),
),
);
}
});
}
private removeHoverListeners(): void {
if (this.subscriptionCallbacks.length > 0) {
this.subscriptionCallbacks.forEach(cb => {
cb();
});
this.subscriptionCallbacks = [];
}
}
private mouseOverCallback(): void {
this.nativeElement.classList.add('gc-hover-disabled');
}
private mouseOutCallback(): void {
this.nativeElement.classList.remove('gc-hover-disabled');
}
}
/**
* A helper directive that sets tree group line deduction value (needed for proper NG0100 error handling)
*/
@Directive({
selector: '[data-gc-tree-group]',
})
export class TreeGroupDirective<T> {
@Input('data-gc-tree-group')
public groupItem!: RecursiveTreeItem<T>;
}
/**
* A directive allowing to tag template directives who get passed
* an $implicit value who is that least of type T
*/
@Directive({
selector: 'ng-template[data-gc-recursive-tree-item]',
})
export class RecursiveTreeItemTemplateDirective<T> {
@Input('data-gc-recursive-tree-item')
public typeToken!: T;
constructor(
public readonly template: TemplateRef<RecursiveTreeItemTemplateContext<T>>,
) {}
/**
* @ignore
*/
static ngTemplateContextGuard<T>(
_dir: RecursiveTreeItemTemplateDirective<T>,
ctx: unknown,
): ctx is RecursiveTreeItemTemplateContext<T> {
return true;
}
}
type RecursiveTreeItem<T> = TreeItem<RecursiveTreeItem<T>> & {
parent: RecursiveTreeItem<T> | undefined;
value: T | undefined;
emptyChildrenItem?: RecursiveTreeItem<T>;
};
/** A group of tree items. */
export type TreeItemGroup<T> = ItemGroup<T>;
/** Tree item actions. */
export type TreeItemAction<T> =
| NonNullable<TreeItem<T>['actions']>[number]
| { specialAction: typeof MIDDLE_CLICK_ACTION_KEY };
/** Type of text highlighting for tree items. */
export interface TreeItemTextHighlight {
highlight: string;
prop: ReadonlySet<'label' | 'sublabel'>;
}
/** Key of the item used link click action event. */
export const MIDDLE_CLICK_ACTION_KEY: unique symbol = Symbol('middle-click');
/**
* Tree is used for representing links of hierarchically organized web pages.
*/
@Component({
selector: 'gc-tree',
templateUrl: './tree.component.html',
styleUrls: ['../utils/styles/reset-list.css', './tree.component.css'],
})
export class TreeComponent<T>
extends BaseTreeComponent<T, TreeItem<T>, RecursiveTreeItem<T>>
implements OnChanges, AfterViewInit, OnDestroy, FocusableElementOwner
{
/** Label to associate with the tree. */
@Input()
public label = '';
/**
* Keys of items that will be rendered as inactive tree items.
*/
@Input()
public inactiveItems: ReadonlySet<string> = new Set();
/**
* Keys of items that will be highlighted as new tree items.
* Note that this is intended to add a (temporary) highlight for recently added
* entries, to mark an entry which is currently in the process of being created and
* thus incomplete use a regular `TreeItem` with suitable information.
*/
@Input()
public newItems: ReadonlySet<string> = new Set();
/**
* Optional icon provider to use for rendering icons next to entries.
*/
@Input()
public iconProvider?: TemplateRef<unknown>;
/**
* Optional icon provider to use for rendering icons next inside the badges.
*/
@Input()
public badgeIconProvider?: TemplateRef<unknown>;
/**
* show the entry count
* @deprecated - property no longer needs to be an input and will be removed in future as such. (will remain a static property)
*/
@Input()
public showEntryCount = true;
/** Show the button that collapses/expands all tree items. */
@Input()
public showCollapseAllButton = false;
/** Used to display a confirmation-banner on top of the tree. */
@Input()
public confirmationBannerTemplate: TemplateRef<unknown> | null = null;
/**
* Enables setting of the value only when the Promise resolves with value "true".
*/
@Input()
public permitValueChange?: (v: T) => Promise<boolean> | boolean;
/**
* Changes the state of the tree.
* Possible optional states are:
* - loading: indicates that the tree is in a loading state.
* - search: indicates that the tree is in an ongoing search context/state.
*/
@Input()
public state: StructuredControlState = {
loading: false,
search: false,
};
/**
* Informs about the change of the selected item.
*/
@Output()
public readonly valueChange: EventEmitter<T | undefined> = new EventEmitter<
T | undefined
>();
/**
* Fires upon selection of an action of a tree item.
* Possible outputs:
* - *actions* set on a TreeItem
* - *middle click* action
*/
@Output()
public readonly onAction: EventEmitter<{
data: T;
action: TreeItemAction<T>;
}> = new EventEmitter<{
data: T;
action: TreeItemAction<T>;
}>();
/**
* Event emitted when an open gesture is detected on the item (eg pressing return)
*/
@Output()
public readonly onOpenItem: EventEmitter<T> = new EventEmitter<T>();
/**
* @ignore
*/
@ViewChildren(TreeItemDirective)
private listItems?: QueryList<TreeItemDirective<T>>;
/** @ignore */
@ViewChild('canvas')
private canvas?: ElementRef<HTMLCanvasElement>;
/** @ignore */
@ViewChild('nodeCanvas')
private nodeCanvas?: ElementRef<HTMLElement>;
/** @ignore */
@ViewChild('loadingIconEl', { read: ElementRef<HTMLElement> })
private loadingIcon?: ElementRef<HTMLElement>;
/** Text to highlight in the items' label and/or sublabel */
@Input()
public get highlightString(): string | TreeItemTextHighlight {
return this._highlightString;
}
public set highlightString(value: string | TreeItemTextHighlight) {
if (typeof value === 'string') {
this._highlightStringInternal = {
highlight: value,
prop: new Set<'label' | 'sublabel'>(['label']),
};
} else {
this._highlightStringInternal = value;
}
this._highlightString = value;
}
/**
* Menu action items that should be rendered as disabled.
*/
@Input()
public get disabledMenuActions(): ReadonlySet<string> {
return this._disabledMenuActions;
}
public set disabledMenuActions(value: ReadonlySet<string>) {
this._disabledMenuActions = value;
this._int_disabledMenuActions = new Set([
...value,
this._defaultActions[0].key,
]);
}
/** @ignore */
@ViewChild('rootTree')
public set rootTreeElement(value: ElementRef<HTMLElement> | undefined) {
if (this.scrollSubscription) {
this.scrollSubscription();
this.scrollSubscription = undefined;
}
if (value) {
this.scrollSubscription = this.zone.runOutsideAngular(() => {
return subscribe(value.nativeElement, 'scroll', () =>
this.refreshLineCanvas(true),
);
});
}
this._rootTreeElement = value;
}
public get rootTreeElement() {
return this._rootTreeElement;
}
/** @ignore */
protected get emptyListText(): string {
if (this.state.search) {
return 'Kein Treffer für diese Such- und Filterkriterien gefunden.';
}
return 'Keine Einträge vorhanden';
}
/** @ignore */
protected get loadingElementId(): string {
return this._widgetKeys.baseKey + '-loading';
}
/** @ignore */
protected get stateText(): string {
if (this.state.loading && this.state.search) {
return this.LOADING_SEARCH_MESSAGE;
}
if (this.state.loading) {
return this.TREE_IS_LOADING_MESSAGE;
}
return '';
}
/** @ignore */
protected readonly _widgetKeys: WidgetKeySet = createWidgetKeySet('gc-tree');
/** @ignore */
protected _focusedItem?: RecursiveTreeItem<T>;
/** @ignore */
protected _contextMenuOffset = 0;
/** @ignore */
protected _allExpanded = false;
/** @ignore */
protected _allCollapsedBtnIsNarrow = false;
/** @ignore */
protected readonly _defaultActions = [
{
key: this._widgetKeys.widgetKey + '-tree-default',
label: 'Keine Aktion verfügbar',
},
];
/** @ignore */
protected _int_disabledMenuActions: ReadonlySet<string> = new Set([
this._defaultActions[0].key,
]);
/** @ignore */
protected _contextMenuItems: readonly Item[] = this._defaultActions;
/** @ignore */
protected _isNarrow = false;
/** @ignore */
protected _secondaryTextUnderLabel = false;
/** @ignore */
protected _contextMenuOwner?: ElementRef<HTMLElement>;
/** @ignore */
protected _contextMenuLabelledBy?: string;
/** @ignore */
protected readonly typeToken!: T; // required to get the generic type into the directive context, see https://github.com/angular/angular/issues/28731
/** @ignore */
protected lastFocusedItem?: RecursiveTreeItem<T>;
/** @ignore */
protected _highlightStringInternal: TreeItemTextHighlight = {
highlight: '',
prop: new Set(),
};
/** @ignore */
protected TREE_IS_LOADING_MESSAGE = 'Baumstruktur wird geladen';
/** @ignore */
protected LOADING_SEARCH_MESSAGE = 'Ergebnisse werden geladen';
/** @ignore */
protected visibleLoadingText = true;
/** @ignore */
protected _tooltipOwner?: ElementRef<HTMLElement>;
/** @ignore */
private _disabledMenuActions: ReadonlySet<string> = new Set();
/**
* @ignore
*/
private resizeObserver!: ResizeObserver;
/**
* @ignore
*/
private deepestItem?: RecursiveTreeItem<T>;
/** @ignore */
private _highlightString: string | TreeItemTextHighlight = '';
/** @ignore */
private canvasCtx: CanvasRenderingContext2D | null = null;
/** @ignore */
private expansionTimeout?: ReturnType<typeof setTimeout>;
/** @ignore */
private textReadingTimers: {
timeout?: ReturnType<typeof setTimeout>;
interval?: ReturnType<typeof setInterval>;
} = {};
/** @ignore */
private _rootTreeElement?: ElementRef<HTMLElement>;
private scrollSubscription?: Callback;
private canvasDrawingDelta = 0; // A delta applied on firefox to draw lines on a half pixel
constructor(
private host: ElementRef<HTMLElement>,
private zone: NgZone,
private cdr: ChangeDetectorRef,
) {
super(true);
this.canvasDrawingDelta = isGecko() ? 0.5 : 0;
}
/**
* @ignore
*/
@HostListener('keydown', ['$event'])
protected async onKeyDown(event: KeyboardEvent): Promise<void> {
const key = event.key;
const focusedItem = this._focusedItem;
if (focusedItem) {
if (
event.shiftKey &&
(key === 'ArrowUp' ||
key === 'ArrowDown' ||
key === 'ArrowLeft' ||
key === 'ArrowRight')
) {
this.handleKeyboardScroll(key);
event.preventDefault();
} else {
switch (key) {
case 'Enter':
event.preventDefault();
await this.handleSubmitButtons(focusedItem, true);
break;
case ' ':
event.preventDefault();
await this.handleSubmitButtons(focusedItem, false);
break;
case 'Tab':
super.handleItemKeyEvent(event, focusedItem);
break;
default:
super.handleItemKeyEvent(event, focusedItem);
}
}
this.determineContextMenuOwner(focusedItem, 'keyboard');
}
}
/** @ignore */
override ngAfterViewInit(): void {
super.ngAfterViewInit();
this.zone.runOutsideAngular(() => {
this.resizeObserver = new ResizeObserver(
this.resizeObserverCallback.bind(this),
);
this.resizeObserver.observe(this.host.nativeElement);
});
}
/**
* @ignore
*/
public override ngOnDestroy(): void {
super.ngOnDestroy();
this.resizeObserver.disconnect();
clearTimeout(this.textReadingTimers.timeout);
clearInterval(this.textReadingTimers.interval);
}
/** @ignore */
public override ngOnChanges(changes: SimpleChanges): void {
super.ngOnChanges(changes);
if ('items' in changes || 'itemAdapter' in changes) {
this.cdr.detectChanges();
this.updateAllExpandedState();
this.zone.runOutsideAngular(() => {
this.computeTextUnderLabelMode();
setTimeout(() => {
this.refreshLineCanvas(false);
});
});
}
if ('state' in changes) {
this.updateTextReadingTimers();
setTimeout(() => {
this._tooltipOwner = this.loadingIcon;
});
}
}
/** @ignore */
public focusChild(): boolean {
if (this._items[0]) {
this.getNativeElementForItem(this._items[0]).focus();
return true;
}
return false;
}
/** Expands the tree item and all of its parents. */
public override expandItem(key: Key): void {
super.expandItem(key);
}
/** Focuses on an item. */
public focusItem(value: T): void {
const key = value !== undefined ? this.convert(value).key : undefined;
if (key !== undefined) {
const recursiveTreeItem = this.getItemByKey(key);
if (recursiveTreeItem) {
this._focusItem(recursiveTreeItem);
}
}
}
/** @ignore */
protected override isBaseItem(x: unknown): x is TreeItem<T> {
return isTreeItem(x);
}
/** @ignore */
protected override createGroupItem(
base: RecursiveTreeItem<T>,
): RecursiveTreeItem<T> {
const emptyItem = {
key: base.key + '-empty',
label: '',
parent: base,
value: undefined,
};
return {
...base,
children: base.children?.length === 0 ? [emptyItem] : base.children,
emptyChildrenItem: base.children?.length === 0 ? emptyItem : undefined,
};
}
/** @ignore */
protected override createItem(
value: T,
converted: TreeItem<T>,
parent: RecursiveTreeItem<T> | undefined,
children: RecursiveTreeItem<T>[] | undefined,
): RecursiveTreeItem<T> {
return { ...converted, parent, children, value };
}
/** @ignore */
protected _focusItem(item: RecursiveTreeItem<T>): void {
const element = this.getNativeElementForItem(item);
element.focus();
}
/**
* @ignore
*/
protected _isParentNode(item: RecursiveTreeItem<T>): boolean {
return item.children != undefined && item.children.length > 0;
}
/**
* @ignore
*/
protected async _onItemClick(
event: MouseEvent,
el: HTMLElement,
item: RecursiveTreeItem<T>,
): Promise<void> {
const doChange = () => {
event.preventDefault();
event.stopPropagation();
this._selectedItemKey = item.key;
this.valueChange.emit(this.value);
el.focus();
};
if (event.button === 0) {
await this.doPermittedChange(item, doChange);
}
}
/** @ignore */
protected _onItemAuxClick(
event: MouseEvent,
item: RecursiveTreeItem<T>,
): void {
const isMiddleButton = event.button === 1;
if (item.value && isMiddleButton) {
this.onAction.emit({
data: item.value,
action: { specialAction: MIDDLE_CLICK_ACTION_KEY },
});
}
}
/** @ignore */
protected _onItemDblClick(): void {
this.onOpenItem.emit(this.value);
}
/** @ignore */
protected _onMenuAction(treeItem: RecursiveTreeItem<T>, action: Item) {
const value = treeItem.value;
if (value !== undefined) {
this.onAction.emit({ data: value, action });
} else {
console.error('failed to lookup tree data for item', treeItem);
}
}
/**
* @ignore
*/
protected _onFocus(item: RecursiveTreeItem<T>): void {
this._focusedItem = item;
this.lastFocusedItem = item;
}
/**
* @ignore
*/
protected _onContextMenuAction(action: Item): void {
if (this.lastFocusedItem) {
if (this.lastFocusedItem.value) {
this.onAction.emit({ data: this.lastFocusedItem.value, action });
} else {
console.error('missing value in lastFocusedItem', this.lastFocusedItem);
}
}
}
/**
* @ignore
*/
protected _onArrowClick(
event: MouseEvent,
targetEl: HTMLElement,
item: RecursiveTreeItem<T>,
): void {
event.preventDefault();
event.stopPropagation();
targetEl.focus();
if (!this.isEndNode(item)) {
this.toggleExpandedState(item);
}
}
/**
* @ignore
*/
protected _onPointerDown(
event: MouseEvent,
item: RecursiveTreeItem<T>,
): void {
if (event.button === 2) {
this.determineContextMenuOwner(item, 'mouse');
}
}
/** @ignore */
protected _onAllCollapsedButtonAction(): void {
this._allExpanded = !this._allExpanded;
const expanded = this._allExpanded;
this.setExpandedStateForAllItems(this._allExpanded);
if (!expanded) {
this._focusedItem = undefined;
this.lastFocusedItem = undefined;
}
this.computeTextUnderLabelMode();
}
/** @ignore */
protected override setExpandedState(
items: RecursiveTreeItem<T> | readonly RecursiveTreeItem<T>[],
expanded: boolean,
) {
super.setExpandedState(items, expanded);
this.computeTextUnderLabelMode();
this.updateAllExpandedState();
this.cdr.detectChanges();
this.zone.runOutsideAngular(() => {
this.refreshLineCanvas(false);
});
}
/**
* @ignore
*/
protected _isSelectedItem(item: RecursiveTreeItem<T>): boolean {
return this._selectedItemKey === item.key;
}
/**
* @ignore
*/
protected _shouldHaveInitialFocus(item: RecursiveTreeItem<T>): boolean {
const firstItemKey = this._items[0]?.key;
return this.lastFocusedItem === undefined && firstItemKey === item.key;
}
/** @ignore */
protected _getCategoryItemsCount(categoryKey: Key): number {
return this.categoryItemCount.get(categoryKey) ?? 0;
}
/** @ignore */
protected _onTreeCategoryClick(item: RecursiveTreeItem<T>): void {
this.toggleExpandedState(item);
}
/**
* @ignore
*/
protected _itemTrackBy(_index: number, item: Item): string {
return itemTrack(item);
}
/** @ignore */
protected getTreeItemGroupId(item: Item): string {
return this._widgetKeys.baseKey + '-group-' + item.key;
}
/** @ignore */
protected treeItemId(key: Key): string {
return this._widgetKeys.widgetKey + '-i-' + key;
}
/** @ignore */
protected treeItemPrimaryLabelId(key: Key): string {
return this._widgetKeys.widgetKey + '-il-' + key;
}
/** @ignore */
protected override scrollToSelectedItem(): void {
if (!this.rootTreeElement) {
return;
}
const selectedItem = this.listItems?.find(
i => i.item.key === this._selectedItemKey,
);
const scrollContainerHeight =
this.rootTreeElement.nativeElement.getBoundingClientRect().height;
const rootTreeHeight =
this.rootTreeElement.nativeElement.firstElementChild?.getBoundingClientRect()
.height;
const isScrollable = scrollContainerHeight !== rootTreeHeight;
if (selectedItem && isScrollable) {
selectedItem.nativeElement.scrollIntoView({
block: 'nearest',
inline: 'nearest',
});
}
}
/** @ignore */
protected isHorizontalLineVisible(item: RecursiveTreeItem<T>): boolean {
return (
item.parent !== undefined &&
this.isExpanded(item.parent) &&
!this.isTreeItemGroupKey(item.parent.key)
);
}
/** @ignore */
protected isVerticalLineVisible(item: RecursiveTreeItem<T>): boolean {
const foundItem = this.listItems?.find(i => i.item.key === item.key);
const isBasicItemAmongGroupedItems =
this._items.some(i => this.isTreeItemGroupKey(i.key)) &&
isTreeItemBasic(item) &&
this._items.some(i => i.key === item.key);
const isExpandedWithChildren =
foundItem?.nativeElement !== undefined &&
foundItem.item.children !== undefined &&
this.isExpanded(foundItem.item);
return (
isExpandedWithChildren &&
!this.isTreeItemGroupKey(item.key) &&
!isBasicItemAmongGroupedItems
);
}
/**
* @ignore
*/
private determineContextMenuOwner(
item: RecursiveTreeItem<T>,
source: 'mouse' | 'keyboard',
): void {
this._contextMenuItems =
item.actions && item.actions.length > 0
? item.actions
: this._defaultActions;
const liElement = this.getNativeElementForItem(item);
this.setCorrectContextMenuOffset(source, liElement);
this._contextMenuOwner = new ElementRef(liElement);
this._contextMenuLabelledBy = this.treeItemPrimaryLabelId(item.key);
}
/**
* @ignore
*/
private setCorrectContextMenuOffset(
source: 'mouse' | 'keyboard',
htmlElement: HTMLElement,
): void {
if (source === 'keyboard') {
this._contextMenuOffset =
32 - htmlElement.getBoundingClientRect().height / 2;
} else {
this._contextMenuOffset = 0;
}
}
/** @ignore */
private handleKeyboardScroll(
key: 'ArrowUp' | 'ArrowDown' | 'ArrowLeft' | 'ArrowRight',
): void {
if (!this.rootTreeElement) {
return;
}
switch (key) {
case 'ArrowDown':
this.rootTreeElement.nativeElement.scrollBy({
top: KEYBOARD_SCROLL_AMOUNT,
behavior: 'smooth',
});
break;
case 'ArrowUp':
this.rootTreeElement.nativeElement.scrollBy({
top: -KEYBOARD_SCROLL_AMOUNT,
behavior: 'smooth',
});
break;
case 'ArrowRight':
this.rootTreeElement.nativeElement.scrollBy({
left: KEYBOARD_SCROLL_AMOUNT,
behavior: 'smooth',
});
break;
case 'ArrowLeft':
this.rootTreeElement.nativeElement.scrollBy({
left: -KEYBOARD_SCROLL_AMOUNT,
behavior: 'smooth',
});
break;
}
}
/** @ignore */
private updateAllExpandedState(): void {
const flattenChildren = (
items: readonly RecursiveTreeItem<T>[],
): readonly RecursiveTreeItem<T>[] =>
items.reduce<readonly RecursiveTreeItem<T>[]>(
(acc, val) => [
...acc,
val,
...(val.children ? flattenChildren(val.children) : []),
],
[],
);
const flatItems = flattenChildren(this._items);
this._allExpanded = flatItems
.filter(i => !this.isEndNode(i))
.every(i => this.isExpanded(i));
}
/** @ignore */
private async handleSubmitButtons(
focusedItem: RecursiveTreeItem<T>,
isOpenAction: boolean,
): Promise<void> {
const doChange = () => {
// regular item -> select and optionally open
this._selectedItemKey = focusedItem.key;
const newValue = this.value;
this.valueChange.emit(newValue);
if (isOpenAction) {
this.onOpenItem.emit(newValue);
}
};
// check whether the action is performed on a group category element, in which case no selection is performed
if (
focusedItem.parent === undefined &&
this.isTreeItemGroupKey(focusedItem.key)
) {
this._onTreeCategoryClick(focusedItem);
} else {
await this.doPermittedChange(focusedItem, doChange);
}
}
/**
* @ignore
*/
private resizeObserverCallback(): void {
const width = this.host.nativeElement.getBoundingClientRect().width;
this.toggleNarrowMode(width);
this.toggleNarrowAllCollapsedBtnMode(width);
if (this.deepestItem) {
this.toggleSecondaryTextUnderLabelMode(this.deepestItem);
}
this.refreshLineCanvas(false);
}
/** @ignore */
private toggleNarrowAllCollapsedBtnMode(width: number): void {
this._allCollapsedBtnIsNarrow = width < 400;
}
/**
* @ignore
*/
private computeTextUnderLabelMode(): void {
this.determineDeepestItem();
if (this.deepestItem) {
this.toggleSecondaryTextUnderLabelMode(this.deepestItem);
}
}
/** @ignore */
private determineDeepestItem() {
interface CurrDeepestItem {
item: RecursiveTreeItem<T>;
itemLevel: number;
currentAriaLevel: number;
}
if (this._items.length > 0) {
const effectiveLevel = (
item: RecursiveTreeItem<T>,
ariaLevel: number,
): number => {
return item.visualLevel && item.visualLevel > ariaLevel
? item.visualLevel
: ariaLevel;
};
const findDeepest = (
currDeepestItem: CurrDeepestItem,
item: RecursiveTreeItem<T>,
): CurrDeepestItem => {
const currLevel = effectiveLevel(
item,
currDeepestItem.currentAriaLevel,
);
let deepestItem = currDeepestItem;
if (currLevel > currDeepestItem.itemLevel) {
deepestItem = {
item,
itemLevel: currLevel,
currentAriaLevel: currDeepestItem.currentAriaLevel,
};
}
if (item.children && this.isExpanded(item)) {
deepestItem = item.children.reduce(findDeepest, {
...deepestItem,
currentAriaLevel: currDeepestItem.currentAriaLevel + 1,
});
}
return {
...deepestItem,
currentAriaLevel: currDeepestItem.currentAriaLevel,
};
};
const initialItem = this._items[0];
const deepestItem = this._items.reduce(findDeepest, {
item: initialItem,
itemLevel: effectiveLevel(initialItem, 1),
currentAriaLevel: 1,
});
this.deepestItem = deepestItem.item;
} else {
this.deepestItem = undefined;
}
}
/**
* @ignore
*/
private toggleSecondaryTextUnderLabelMode(el: RecursiveTreeItem<T>): void {
if (this.state.loading) {
return;
}
if (this.expansionTimeout !== undefined) {
window.clearTimeout(this.expansionTimeout);
}
// wait for expansion
this.expansionTimeout = setTimeout(() => {
const treeItemEl = this.getNativeElementForItem(el);
const elWidth = treeItemEl.getBoundingClientRect().width;
const prevVal = this._secondaryTextUnderLabel;
const newVal = elWidth < 640;
if (prevVal !== newVal) {
if (!NgZone.isInAngularZone()) {
this.zone.run(() => {
this._secondaryTextUnderLabel = newVal;
});
} else {
this._secondaryTextUnderLabel = newVal;
}
}
});
}
/**
* @ignore
*/
private toggleNarrowMode(width: number): void {
const prevVal = this._isNarrow;
const newVal = width < 512;
if (prevVal !== newVal) {
this.zone.run(() => {
this._isNarrow = newVal;
});
}
}
/** @ignore */
private getNativeElementForItem(item: RecursiveTreeItem<T>): HTMLElement {
const element = document.getElementById(this.treeItemId(item.key));
if (!element) {
throw new Error(`failed to find HTML element for item ${item.key}`);
} else {
return element;
}
}
/** @ignore */
private async doPermittedChange(
item: RecursiveTreeItem<T>,
doChange: () => void,
) {
if (
this.permitValueChange !== undefined &&
item.value &&
this.value !== item.value
) {
const permit = this.permitValueChange(item.value);
if (typeof permit !== 'boolean') {
// permit is of type Promise<boolean>
const proceed = await permit;
if (proceed) {
doChange();
}
} else if (permit) {
// permit is of type boolean
doChange();
}
} else {
doChange();
}
}
private maxDomItem() {
if (isGecko()) {
return 3000;
} else if (isWebkit()) {
return 4000;
}
return 8000;
}
/** @ignore */
private refreshLineCanvas(repositionOnly: boolean): void {
NgZone.assertNotInAngularZone();
if (
this.canvas &&
this.canvasCtx !== this.canvas.nativeElement.getContext('2d')
) {
this.canvasCtx = this.canvas.nativeElement.getContext('2d');
}
if (
!this.rootTreeElement ||
!this.canvas ||
!this.canvasCtx ||
!this.nodeCanvas
) {
return;
}
const treeEl = this.rootTreeElement.nativeElement;
this.canvas.nativeElement.width = treeEl.offsetWidth;
this.canvas.nativeElement.height = treeEl.clientHeight;
if ((this.listItems?.length ?? 0) > this.maxDomItem()) {
const color = matchMedia('(forced-colors: active)').matches
? 'CanvasText'
: getComputedStyle(document.body).getPropertyValue('--gc-grau-dunkel');
this.canvasCtx.clearRect(
0,
0,
this.canvas.nativeElement.width,
this.canvas.nativeElement.height,
);
this.canvasCtx.lineWidth = 2;
this.canvasCtx.strokeStyle = color;
this.computeCanvasLines(this.canvasCtx);
this.nodeCanvas.nativeElement.innerHTML = '';
} else {
this.canvasCtx.clearRect(
0,
0,
this.canvas.nativeElement.width,
this.canvas.nativeElement.height,
);
if (!repositionOnly) {
this.computeDomCanvasLines(this.nodeCanvas.nativeElement);
}
}
}
/** @ignore */
private computeDomCanvasLines(nodeContainer: HTMLElement) {
const color = 'var(--gc-grau-dunkel)';
let dom = '';
this.listItems?.forEach(i => {
dom += this.computeHorizontalDomLine(i, color);
dom += this.computeVerticalDomLine(i, color);
});
nodeContainer.innerHTML = dom;
}
/** @ignore */
private computeHorizontalDomLine(
i: TreeItemDirective<T, RecursiveTreeItem<T>>,
color: string,
): string {
if (this.isHorizontalLineVisible(i.item)) {
const left = this.getHorizontalLineLeft(i);
const top = this.getHorizontalLineTopPos(i);
const width =
this.getHorizontalLineWidth(i) - this.getHorizontalLineLeft(i);
return `<div style="position: absolute; left: ${left.toFixed(0)}px; top: ${top.toFixed(0)}px; width: ${width.toFixed(0)}px; border-top: 2px solid ${color};"></div>`;
}
return '';
}
/** @ignore */
private computeVerticalDomLine(
i: TreeItemDirective<T, RecursiveTreeItem<T>>,
color: string,
): string {
if (this.isVerticalLineVisible(i.item)) {
const top = this.getVerticalLineTopPos(i);
const left = this.getVerticalLineLeftPos(i);
const height =
this.getVerticalLineHeight(i) - this.getVerticalLineTopPos(i);
return `<div style="position: absolute; left: ${left.toFixed(0)}px; top: ${top.toFixed(0)}px; width: 2px; height: ${height.toFixed(0)}px; border-color: ${color}; border-width: 0 0 2px 2px; border-style: solid; width: 13px; border-radius: 0 0 0 4px;"></div>`;
}
return '';
}
/** @ignore */
private computeCanvasLines(canvasCtx: CanvasRenderingContext2D): void {
this.listItems?.forEach(i => {
this.computeHorizontalLine(i, canvasCtx);
this.computeVerticalLine(i, canvasCtx);
});
}
/** @ignore */
private computeHorizontalLine(
i: TreeItemDirective<T, RecursiveTreeItem<T>>,
canvasCtx: CanvasRenderingContext2D,
) {
if (this.isHorizontalLineVisible(i.item) && this.rootTreeElement) {
const deltaX = this.rootTreeElement.nativeElement.scrollLeft;
const deltaY = this.rootTreeElement.nativeElement.scrollTop;
const y = this.getHorizontalLineTopPos(i) - deltaY;
// Skip lines not needed
if (y > -20 && y < this.rootTreeElement.nativeElement.clientHeight + 20) {
canvasCtx.beginPath();
canvasCtx.moveTo(this.getHorizontalLineLeft(i) - deltaX, y);
canvasCtx.lineTo(this.getHorizontalLineWidth(i) - deltaX, y);
canvasCtx.stroke();
}
}
}
/** @ignore */
private getHorizontalLineTopPos(item: TreeItemDirective<T>): number {
const el = item.nativeElement;
return el.offsetTop + 32;
}
/** @ignore */
private getHorizontalLineLeft(item: TreeItemDirective<T>): number {
const parent = item.item.parent;
const parentChildren = item.item.parent?.children;
const parentEl = this.listItems?.find(
i => parent?.key === i.item.key,
)?.nativeElement;
const lastNodeInset =
parentChildren &&
parentChildren[parentChildren.length - 1].key === item.item.key
? 12
: 0;
// lastNodeInset is used to provide space for a better curvature of the vertical line
return parentEl ? parentEl.offsetLeft + 32 + lastNodeInset : 4;
}
/** @ignore */
private getHorizontalLineWidth(item: TreeItemDirective<T>): number {
const el = item.nativeElement;
return el.offsetLeft;
}
/** @ignore */
private getVerticalLineLeftPos(item: TreeItemDirective<T>): number {
const el = item.nativeElement;
return el.offsetLeft + 32;
}
/** @ignore */
private getVerticalLineTopPos(item: TreeItemDirective<T>): number {
const el = item.nativeElement;
return el.offsetTop + el.getBoundingClientRect().height;
}
/** @ignore */
private getVerticalLineHeight(item: TreeItemDirective<T>): number {
const children = item.item.children;
if (children && children.length > 0) {
const lastChild = children[children.length - 1];
const lastChildEl = this.listItems?.find(
i => lastChild.key === i.item.key,
)?.nativeElement;
if (lastChildEl) {
return lastChildEl.offsetTop + 32;
}
}
return 0;
}
/** @ignore */
private computeVerticalLine(
i: TreeItemDirective<T, RecursiveTreeItem<T>>,
canvasCtx: CanvasRenderingContext2D,
) {
if (this.isVerticalLineVisible(i.item) && this.rootTreeElement) {
const deltaX = this.rootTreeElement.nativeElement.scrollLeft;
const deltaY = this.rootTreeElement.nativeElement.scrollTop;
const x =
this.getVerticalLineLeftPos(i) - deltaX - this.canvasDrawingDelta;
const y =
this.getVerticalLineHeight(i) - deltaY + this.canvasDrawingDelta;
if (y > -20) {
canvasCtx.beginPath();
canvasCtx.moveTo(
x,
this.getVerticalLineTopPos(i) - deltaY < 0
? 0
: this.getVerticalLineTopPos(i) - deltaY,
);
// 4px === border radius (curvature)
canvasCtx.arcTo(x, this.getVerticalLineHeight(i) - deltaY, x + 4, y, 4);
// 13px allows enough space for a proper curvature to happen
canvasCtx.lineTo(x + 13, y);
canvasCtx.stroke();
}
}
}
/** @ignore */
private updateTextReadingTimers() {
if (this.state.loading) {
this.textReadingTimers.timeout = setTimeout(() => {
this.visibleLoadingText = false;
this.visibleLoadingText = true;
this.textReadingTimers.interval = setInterval(() => {
this.visibleLoadingText = false;
this.visibleLoadingText = true;
}, LOADING_TEXT_READ_INTERVAL);
}, LOADING_TEXT_INIT_READ_DELAY);
} else {
clearTimeout(this.textReadingTimers.timeout);
clearInterval(this.textReadingTimers.interval);
}
}
}
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