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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterContentInit,
AfterViewInit,
Component,
ContentChildren,
ElementRef,
EventEmitter,
HostBinding,
Input,
NgZone,
OnDestroy,
Output,
QueryList,
TemplateRef,
ViewChild,
ViewChildren,
forwardRef,
} from '@angular/core';
import { Subscription } from 'rxjs';
import { Maybe, observeSize } from '../utils/internal-utils';
import {
Callback,
FocusableElementOwner,
Item,
Key,
WidgetKeySet,
} from '../utils/util.types';
import { createWidgetKeySet } from '../utils/utilities';
import { TabPickerComponent } from './tab-picker.component';
import { TabComponent } from './tab.component';
export type TabListMode = 'default' | 'scroll' | 'picker';
type Overflow = 'both' | 'left' | 'right';
interface Rect {
left: number;
top: number;
right: number;
bottom: number;
width: number;
height: number;
}
function relativeRect(element: HTMLElement): Rect {
const rect = element.getBoundingClientRect();
const parent = element.parentElement;
if (parent) {
const parentRect = parent.getBoundingClientRect();
return createRect(
Math.floor(rect.x - parentRect.x),
Math.floor(rect.y - parentRect.y),
Math.ceil(rect.width),
Math.ceil(rect.height),
);
}
return createRect(rect.x, rect.y, rect.width, rect.height);
}
function createRect(
left: number,
top: number,
width: number,
height: number,
): Rect {
return {
left,
top,
width,
height,
right: left + width,
bottom: top + height,
};
}
/**
* A Tab Folder component that contains a Tab component or multiple Tab components and displays the content of the active one.
*/
@Component({
selector: 'gc-tab-folder',
templateUrl: './tab-folder.component.html',
styleUrls: [
'./../utils/styles/reset-button.css',
'./tab-folder.component.css',
],
standalone: false,
})
export class TabFolderComponent
implements AfterContentInit, AfterViewInit, OnDestroy, FocusableElementOwner
{
/**
* A label text to be used for aria-label attribute.
*/
@Input()
public label = '';
/**
* Decides if the tab buttons will appear rounded or not.
*/
@Input()
public variant: 'default' | 'rounded' = 'default';
/**
* Sets the surface color.
*/
@Input()
public surface: 'default' | 'contrast' = 'default';
/**
* User-initiated tab switch will be only performed when the callback evaluates with value `true`. Leaving this
* empty (`undefined`) is equivalent to always resolving to `true`.
*/
@Input()
public permitTabKeyChange?: (key: Key | symbol) => Promise<boolean> | boolean;
/**
* Optional template to render icon
*/
@Input()
public iconProvider?: TemplateRef<unknown>;
/**
* Set of item keys that will be rendered as disabled items.
*/
@Input()
public disabledItems: ReadonlySet<string> = new Set();
/**
* Informs about the changes of the active tab key.
*/
@Output()
public readonly activeTabKeyChange: EventEmitter<string> =
new EventEmitter<string>(true);
/** @ignore */
@ContentChildren(forwardRef(() => TabComponent))
protected _tabs?: QueryList<TabComponent>;
/** @ignore */
@HostBinding('style.--gc-tab-header-inset.px')
private _tabHeaderInset: number | null = null;
/**
* @ignore
*/
@ViewChildren('tabButton')
private tabButtons: QueryList<ElementRef<HTMLButtonElement>> =
new QueryList();
/**
* @ignore
*/
@ViewChild('tabFolder')
private tabFolder!: ElementRef<HTMLDivElement>;
/**
* @ignore
*/
@ViewChild('tabList')
private tabList!: ElementRef<HTMLDivElement>;
/** @ignore */
@ViewChild('picker', { read: TabPickerComponent })
private picker?: TabPickerComponent<Item>;
@Input()
public get tabHeaderInset(): number | null {
return this._tabHeaderInset;
}
public set tabHeaderInset(value: number | null) {
this._tabHeaderInset = value;
this.handleResize();
}
/**
* Key of the active tab.
*/
@Input()
public get activeTabKey(): string {
return this._activeTabKey;
}
public set activeTabKey(key: string) {
this._activeTabKey = key;
this.selectTabButtonByActiveTabKey();
}
/** @ignore */
protected readonly widgetKeys: WidgetKeySet =
createWidgetKeySet('gc-tab-folder');
/**
* @ignore
*/
protected _overflow: Overflow = 'both';
/**
* @ignore
*/
protected _mode: TabListMode = 'default';
/** @ignore */
protected pickerTabs: TabComponent[] = [];
/**
* @ignore
*/
private _focusedTabIndex = 0;
/**
* @ignore
*/
private _activeTabKey = '';
/**
* @ignore
*/
private currentDelta = 0;
/**
* @ignore
*/
private _resizeUpdate?: ReturnType<typeof setTimeout>;
/**
* @ignore
*/
private _resizeDestroy?: Callback;
/** @ignore */
private tabsSubscription?: Subscription;
/** @ignore */
private lastActiveItemIndex = 0;
constructor(
private el: ElementRef<HTMLElement>,
zone: NgZone,
) {
this._resizeDestroy = observeSize(el, zone, () => {
this.handleResize();
});
}
/**
* @ignore
*/
ngAfterViewInit(): void {
setTimeout(() => {
this.selectTabButtonByActiveTabKey();
});
}
/** @ignore */
public ngAfterContentInit(): void {
this.pickerTabs = this._tabs ? this._tabs.toArray() : [];
this.tabsSubscription = this._tabs?.changes.subscribe(() =>
this.updateTabs(),
);
}
/**
* @ignore
*/
ngOnDestroy(): void {
if (this._resizeDestroy) {
this._resizeDestroy();
this._resizeDestroy = undefined;
}
if (this._resizeUpdate) {
clearTimeout(this._resizeUpdate);
this._resizeUpdate = undefined;
}
if (this.tabsSubscription) {
this.tabsSubscription.unsubscribe();
}
}
public focusChild(): boolean {
const activeTabIndex = this._tabs
?.toArray()
.findIndex(tab => tab.key === this.activeTabKey);
const activeTabButton = activeTabIndex
? this.tabButtons.get(activeTabIndex)
: undefined;
const firstTabButton = this.tabButtons.get(0);
if (this._mode === 'picker' && this.picker) {
this.picker.focusChild();
return true;
} else if (activeTabButton) {
activeTabButton.nativeElement.focus();
return true;
} else if (firstTabButton) {
firstTabButton.nativeElement.focus();
return true;
} else {
return false;
}
}
/**
* @ignore
*/
protected _selectTab(tab: TabComponent): void {
this.setActiveTabKey(tab);
this.moveSelectedTabIntoView();
this.lastActiveItemIndex = this._tabs
? this._tabs.toArray().indexOf(tab)
: 0;
}
/** @ignore */
protected _handlePickerChange(tab: TabComponent): void {
this._selectTab(tab);
this.activeTabKeyChange.emit(this.activeTabKey);
}
/**
* @ignore
*/
protected _onFocus(tab: TabComponent): void {
if (this._tabs) {
this._focusedTabIndex = this._tabs.toArray().indexOf(tab);
}
}
/**
* @ignore
*/
protected _onKeyDown(event: KeyboardEvent): void {
const key = event.key;
let flag = false;
switch (key) {
case 'ArrowRight':
flag = true;
this.moveToNextTabIndex();
break;
case 'ArrowLeft':
flag = true;
this.moveToPrevTabIndex();
break;
case 'Home':
flag = true;
this.moveToFirstTabIndex();
break;
case 'End':
flag = true;
this.moveToLastTabIndex();
break;
default:
break;
}
if (flag) {
event.stopPropagation();
event.preventDefault();
}
const tabToFocus = this.tabButtons.toArray().find((el, idx) => {
if (idx === this._focusedTabIndex) {
return el;
} else {
return null;
}
});
if (tabToFocus) {
tabToFocus.nativeElement.focus();
}
}
/** @ignore */
protected _handleScrollLeft(): void {
const element = this.tabButtons.find(b => {
const rect = relativeRect(b.nativeElement);
const viewPort = this._getTabsViewPort();
return viewPort.left > rect.left && viewPort.left <= rect.right;
});
if (element) {
const rect = relativeRect(element.nativeElement);
this.moveIntoView(rect, element.nativeElement);
}
}
/** @ignore */
protected _handleScrollRight(): void {
const viewPort = this._getTabsViewPort();
const element = this.tabButtons.find(b => {
const rect = relativeRect(b.nativeElement);
return rect.left >= viewPort.left && rect.right > viewPort.right;
});
if (element) {
const rect = relativeRect(element.nativeElement);
this.moveIntoView(rect, element.nativeElement);
}
}
/** @ignore */
protected _activeTab(): TabComponent | undefined {
return this._tabs?.find(tab => tab.key == this.activeTabKey);
}
/** @ignore */
protected async tabChangeHandler(tab: TabComponent) {
const doChange = () => {
this._selectTab(tab);
this.activeTabKeyChange.emit(this.activeTabKey);
};
if (
this.permitTabKeyChange !== undefined &&
this.activeTabKey !== tab.key
) {
const permit = this.permitTabKeyChange(tab.key);
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 if (
this.permitTabKeyChange === undefined &&
this.activeTabKey !== tab.key
) {
doChange();
}
}
/** @ignore */
private _getTabsViewPort(): Rect {
const tabRect = this.tabList.nativeElement.getBoundingClientRect();
return createRect(
Math.ceil(Math.abs(this.currentDelta)),
0,
Math.ceil(tabRect.width),
Math.ceil(tabRect.height),
);
}
/** @ignore */
private schedulResizeUpdate() {
if (this._resizeUpdate) {
clearTimeout(this._resizeUpdate);
}
this._resizeUpdate = setTimeout(() => {
this._resizeUpdate = undefined;
this.handleResize();
});
}
/**
* @ignore
*/
private moveSelectedTabIntoView(): void {
if (this._activeTabKey) {
this.findTabByKey(this.activeTabKey).then(b => {
const rect = relativeRect(b);
this.updateIndicator(rect);
this.moveIntoView(rect, b);
});
}
}
/**
* @ignore
*/
private updateIndicator(rect: Rect) {
this.el.nativeElement.style.setProperty(
'--gc-selection-start',
rect.left.toString() + 'px',
);
this.el.nativeElement.style.setProperty(
'--gc-selection-end',
rect.right.toString() + 'px',
);
}
/**
* @ignore
*/
private isFullyVisible(b: HTMLButtonElement) {
const rect = relativeRect(b);
const width = this._getTabsViewPort().width;
return !(
this.currentDelta + rect.left < 0 ||
this.currentDelta + rect.right > width
);
}
/**
* @ignore
*/
private moveIntoView(rect: Rect, b: HTMLButtonElement) {
if (this._mode === 'default') {
this.currentDelta = 0;
this.el.nativeElement.style.setProperty(
'--gc-shift-x',
this.currentDelta.toString() + 'px',
);
return;
} else if (this._mode === 'picker') {
return;
}
if (!this.isFullyVisible(b)) {
const viewPort = this._getTabsViewPort();
if (viewPort.left > rect.left) {
// left out of view
this.currentDelta = -rect.left;
} else if (viewPort.right < rect.right) {
// right out of view
this.currentDelta = Math.ceil(
viewPort.width - (rect.left + rect.width + 1),
);
}
}
this.currentDelta = this.constraintDelta(this.currentDelta);
this.el.nativeElement.style.setProperty(
'--gc-shift-x',
this.currentDelta.toString() + 'px',
);
const first = this.tabButtons.get(0)?.nativeElement;
const last = this.tabButtons.get(this.tabButtons.length - 1)?.nativeElement;
if (first && last) {
const firstVisible = this.isFullyVisible(first);
const lastVisible = this.isFullyVisible(last);
if (!firstVisible && !lastVisible) {
this._overflow = 'both';
} else if (!firstVisible) {
this._overflow = 'left';
} else {
this._overflow = 'right';
}
}
}
/**
* @ignore
*/
private maxDelta() {
const buttonWidths = this.tabButtons.map(
b => b.nativeElement.getBoundingClientRect().width,
);
const totalButtonsWidths = Math.ceil(
buttonWidths.reduce((a, b) => a + b, 0),
);
const tabsWidth = this._getTabsViewPort().width;
return Math.ceil(tabsWidth - totalButtonsWidths);
}
/**
* @ignore
*/
private constraintDelta(delta: number) {
const minDelta = this.maxDelta();
if (minDelta >= 0) {
return 0;
} else {
return Math.ceil(Math.max(delta, minDelta));
}
}
/** @ignore */
private findTabByKey(key: string): Maybe<HTMLButtonElement> {
const idx = this._tabs?.toArray().findIndex(tab => tab.key == key);
if (idx !== undefined && idx !== -1) {
return Maybe.maybe(this.tabButtons.get(idx)?.nativeElement);
}
return Maybe.none();
}
/**
* @ignore
*/
private moveToNextTabIndex(): void {
this._focusedTabIndex += 1;
if (this._tabs && this._focusedTabIndex >= this._tabs.length) {
this._focusedTabIndex = 0;
}
this.moveFocusIntoView();
}
/**
* @ignore
*/
private moveToPrevTabIndex(): void {
this._focusedTabIndex -= 1;
if (this._tabs && this._focusedTabIndex < 0) {
this._focusedTabIndex = this._tabs.length - 1;
}
this.moveFocusIntoView();
}
/**
* @ignore
*/
private moveToFirstTabIndex(): void {
this._focusedTabIndex = 0;
this.moveFocusIntoView();
}
/**
* @ignore
*/
private moveToLastTabIndex(): void {
if (this._tabs) {
this._focusedTabIndex = this._tabs.length - 1;
}
this.moveFocusIntoView();
}
/**
* @ignore
*/
private moveFocusIntoView() {
const b = this.tabButtons.get(this._focusedTabIndex)?.nativeElement;
if (b) {
const rect = relativeRect(b);
this.moveIntoView(rect, b);
}
}
/**
* @ignore
*/
private setActiveTabKey(tab: TabComponent): void {
const foundTab = this._tabs?.find(i => i.key === tab.key);
this._activeTabKey =
foundTab?.key && !this.disabledItems.has(foundTab.key)
? foundTab.key
: this.activeTabKey;
}
/**
* @ignore
*/
private selectTabButtonByActiveTabKey(): void {
const tab = this._tabs?.find(i => i.key == this.activeTabKey);
const indexOfTab =
this._tabs && tab ? this._tabs.toArray().indexOf(tab) : 0;
const tabButton = this.tabButtons.get(indexOfTab)?.nativeElement;
if (tabButton && tab) {
this._selectTab(tab);
}
}
/**
* @ignore
*/
private adjustTabSelectionOnRemoval(): void {
let activeTabKeyIndex = this.lastActiveItemIndex;
if (this._tabs) {
if (activeTabKeyIndex >= this._tabs.length) {
activeTabKeyIndex -= 1;
}
if (activeTabKeyIndex >= 0) {
const targetTab = this._tabs.get(activeTabKeyIndex);
if (targetTab) {
setTimeout(() => {
this._selectTab(targetTab);
this.activeTabKeyChange.emit(this.activeTabKey);
});
}
}
}
}
/**
* @ignore
*/
private handleResize() {
if (this.tabButtons.length == 0) {
return;
}
const buttonWidths = this.tabButtons.map(
b => b.nativeElement.getBoundingClientRect().width,
);
const totalButtonsWidths = Math.ceil(
buttonWidths.reduce((a, b) => a + b, 0),
);
const maxButtonWidth = Math.max(...buttonWidths);
const inset = this.tabHeaderInset ?? 0;
const availableWidth = Math.floor(
this.el.nativeElement.getBoundingClientRect().width - inset * 2,
);
const leftRightButtons = 40 * 2;
if (
maxButtonWidth + leftRightButtons >= availableWidth ||
availableWidth < 288
) {
this.updateMode('picker');
} else if (totalButtonsWidths > availableWidth) {
this.updateMode('scroll');
} else {
this.updateMode('default');
}
if (this._activeTabKey) {
this.moveSelectedTabIntoView();
}
}
/**
* @ignore
*/
private updateMode(mode: TabListMode) {
if (this._mode == mode) {
return;
}
this._mode = mode;
if (this._mode === 'picker') {
this.tabFolder.nativeElement.setAttribute('aria-hidden', 'true');
} else {
this.tabFolder.nativeElement.removeAttribute('aria-hidden');
}
}
/** @ignore */
private updateTabs() {
if (!this._tabs?.find(t => t.key === this.activeTabKey)) {
this.adjustTabSelectionOnRemoval();
} else {
const tabToSelect = this._tabs.find(t => t.key === this.activeTabKey);
if (tabToSelect) {
this._selectTab(tabToSelect);
}
}
this.schedulResizeUpdate();
this.pickerTabs = this._tabs ? this._tabs.toArray() : [];
}
}
|