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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
/* eslint-disable prefer-arrow/prefer-arrow-functions */
import {
ConnectedOverlayPositionChange,
ConnectionPositionPair,
FlexibleConnectedPositionStrategy,
Overlay,
OverlayConfig,
OverlayRef,
PositionStrategy
} from '@angular/cdk/overlay';
import { ElementRef } from '@angular/core';
import {
positionBottomEnd,
positionBottomStart,
positions,
positionTopEnd,
positionTopStart
} from '../models/positions.model';
import { isRTL } from './rtl';
export function makePositionStrategy(
elementRef: ElementRef<any> | undefined,
overlay: Overlay,
placement: keyof typeof positions | ConnectionPositionPair[],
constrain = false,
center = true
): PositionStrategy {
Iif (!elementRef?.nativeElement) {
return overlay.position().global().centerHorizontally().centerVertically();
}
const popoverPositions = getOverlayPositions(elementRef, placement, center);
const positionStrategy = overlay
.position()
.flexibleConnectedTo(elementRef)
.withPush(false)
.withGrowAfterOpen(true)
.withFlexibleDimensions(constrain)
.withPositions(popoverPositions);
Iif (constrain) {
positionStrategy.withViewportMargin(8);
}
return positionStrategy;
}
export function makeOverlay(
positionStrategy: PositionStrategy,
overlay: Overlay,
hasBackdrop: boolean
): OverlayRef {
const config = new OverlayConfig();
config.positionStrategy = positionStrategy;
config.scrollStrategy = overlay.scrollStrategies.reposition();
config.direction = isRTL() ? 'rtl' : 'ltr';
if (hasBackdrop) {
config.hasBackdrop = true;
config.backdropClass = 'cdk-overlay-transparent-backdrop';
} else {
config.hasBackdrop = false;
}
return overlay.create(config);
}
export function getOverlay(
elementRef: ElementRef<any>,
overlay: Overlay,
hasBackdrop: boolean,
placement: keyof typeof positions | ConnectionPositionPair[],
constrain = false,
center = true
): OverlayRef {
const positionStrategy = makePositionStrategy(elementRef, overlay, placement, constrain, center);
return makeOverlay(positionStrategy, overlay, hasBackdrop);
}
export function getPositionStrategy(
overlayref: OverlayRef
): FlexibleConnectedPositionStrategy | undefined {
return overlayref.getConfig().positionStrategy as FlexibleConnectedPositionStrategy;
}
export function getOverlayPositions(
elementRef: ElementRef<any>,
placement: keyof typeof positions | ConnectionPositionPair[],
center = true
): ConnectionPositionPair[] {
if (elementRef.nativeElement && center) {
const rtl = isRTL();
const halfWidth = Math.round(elementRef.nativeElement.offsetWidth / 2);
positionTopStart.offsetX = positionBottomStart.offsetX = halfWidth * (rtl ? 1 : -1);
positionTopEnd.offsetX = positionBottomEnd.offsetX = halfWidth * (rtl ? -1 : 1);
} else {
positionTopStart.offsetX = undefined;
positionTopEnd.offsetX = undefined;
positionBottomStart.offsetX = undefined;
positionBottomEnd.offsetX = undefined;
}
return typeof placement === 'string' ? positions[placement] : placement;
}
export function hasTrigger(trigger: string, triggers?: string): boolean {
return (triggers?.split(/\s+/) ?? []).includes(trigger);
}
export interface OverlayArrowPosition {
left?: number;
right?: number;
}
/**
* calculates the arrow position from left/right for tooltips, popovers, etc
* @param change - the event from the position strategy
* @param overlay - ElementRef for the overlay content, i.e. the popover/tooltip component
* @param anchor - ElementRef for the anchoring element, i.e. the trigger of the popover/tooltip
*/
export function calculateOverlayArrowPosition(
change: ConnectedOverlayPositionChange,
overlay: ElementRef,
anchor?: ElementRef
): OverlayArrowPosition {
if (anchor && ['bottom', 'top'].includes(change.connectionPair.originY)) {
// Calculate offset to the anchor element center
const anchorRect = anchor.nativeElement.getBoundingClientRect();
const overlayRect = overlay.nativeElement.getBoundingClientRect();
const center = anchorRect.left + anchorRect.width / 2;
// Position arrow centered to the anchor element
// prettier-ignore
return isRTL()
? { right: overlayRect.right - center }
: { left: center - overlayRect.left };
}
const offsetX = change.connectionPair.offsetX;
Iif (offsetX) {
// prettier-ignore
return offsetX < 0
? { left: -offsetX }
: { right: offsetX };
}
return {};
}
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