### File

`packages/components/eui-popover/directives/eui-popover-arrow-position.directive.ts`

### Description

Directive that positions an arrow element for a popover relative to its origin element.

This directive calculates and applies the appropriate positioning style to ensure the arrow correctly points to the origin element regardless of the popover's position. It adjusts arrow placement dynamically based on the position strategy ('top', 'bottom', 'left', or 'right') and the dimensions and position of the origin element.

### Basic usage

Example :

    <div class="popover-arrow" [euiPopoverArrowPosition]="position$"></div>

### In component

Example :

    position$ = new BehaviorSubject<[EuiPopoverPosition, DOMRect]>(['bottom', originRect]);

    updatePosition(position: EuiPopoverPosition, rect: DOMRect) {
      this.position$.next([position, rect]);
    }

### Accessibility

- Arrow is purely decorative and does not affect accessibility
- Ensure arrow color has sufficient contrast with background

### Notes

- Automatically calculates arrow position based on origin element bounds
- Handles edge cases where popover is near viewport boundaries
- Used internally by EuiPopoverComponent

### Implements

`OnInit` `OnDestroy`

### Metadata

Selector | `[euiPopoverArrowPosition]`

### Index

###### Inputs
euiPopoverArrowPosition

### Inputs

euiPopoverArrowPosition
Type : `Observable<unknown>`
Observable that emits a tuple containing the popover position strategy and the DOMRect of the origin element. The directive uses this information to calculate the appropriate position for the arrow element.

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