# Popover

![npm](https://img.shields.io/npm/dt/@asphalt-react/popover?style=flat-square)
[![npm version](https://badge.fury.io/js/@asphalt-react%2Fpopover.svg)](https://badge.fury.io/js/@asphalt-react%2Fpopover)

Popover package offers following components:

* Popover
* Tooltip

Popover and Tooltip require a target element that acts as a pivot for their content. They support multiple placement positions, allowing both elements to be positioned next to the target element in any direction.

## Popover

Popover is an interactive floating element that displays information related to an anchor element when the element is clicked. It represents the UI element as floating above the normal flow creating the "pop out" effect. Popover can contain a range of elements from simple strings to complex React designs.

Popover is a controlled component, it does not manage visibility state on it's own.

## Tooltip

Tooltip component allows user to see additional context about a UI element without cluttering the interface. Tooltip provides informative text when the user hovers over, focuses on, and on mobile device taps on an element. Tooltips are often used sparingly to avoid overwhelming users. They are meant to support discovery, not replace clear design or documentation.

To use an icon from `@asphalt-react/iconpack` as the target element for tooltip, wrap the icon inside an HTML element like a `div` or `span`.

## Usage

```js
import React, { useState } from "react"
import { Popover, Tooltip } from "@asphalt-react/popover"
import { Button } from "@asphalt-react/button"

const App = () => {
  const [open, setOpen] = useState(false)

  return (
    <>
      <Popover
        open={open}
        target={<Button>Click Me</Button>}
        onOpenChange={setOpen}
        >
        <p>
          Hello there
        </p>
      </Popover>
      <Tooltip
        target={<a href="#">Hover over here</a>}
        >
        Add information here
      </Tooltip>
    </>
  )
}

export default App
```

## Sizes

Popover & Tooltip comes in 3 sizes `small(s)`, `medium(m)` & `large(l)`.

## Building blocks

1. Popover component comes with:
   * BasePopover
   * FocusManager

2. `BasePopover` supports 3 sizes: `small(s)`, `medium(m)` & `large(l)`.

3. `FocusManager` handles the focus management for Popover content.

## Hooks

### usePopover

Use the `usePopover()` hook to get all the prop getter functions and then spread them in the target & popover components. `usePopover()` takes props as parameter.

React hook which returns prop getter functions. Use these functions to generate prop objects for different components in Popover.

#### Arguments

usePopover accepts the following props:

1. open
2. placement
3. outOfFlow
4. flip
5. size
6. bezel
7. focusTrap
8. noOffset
9. lowOffset
10. mediumOffset
11. highOffset
12. onOpenChange
13. stretch
14. returnFocus

#### Getter functions

#### getTargetProps()

Use this function to create props for Target element of the Popover.

```jsx
const { getTargetProps } = usePopover({ open: true, onOpenChange: setOpen })

<Button {...getTargetProps()}>
  Click me
</Button>
```

#### getPopoverProps()

Use this function to create props for Popover/floating component.

```jsx
const { getPopoverProps } = usePopover({ open: true, onOpenChange: setOpen })

<BasePopover {...getPopoverProps()}>
  <p>
    Hello there!
  </p>
</BasePopover>
```

#### getFocusProps()

Use this function to create props for `FocusManager` component.

```jsx
const { getFocusProps } = usePopover({ open: true, onOpenChange: setOpen })

<FocusManager {...getFocusProps()}>
  <BasePopover {...getPopoverProps()}>
    <p>
      Hello there!
    </p>
  </BasePopover>
<FocusManager>
```

#### Usage

```js
import { BasePopover, usePopover, FocusManager } from "@asphalt-react/popover"

const App = () => {
  const [open, setOpen] = useState(false)

  const { getTargetProps, getPopoverProps, getFocusProps } = usePopover({
    open,
    onOpenChange: setOpen,
  })

  return (
    <div>
      <Button {...getTargetProps()}>Click me</Button>
      {open && (
        <FocusManager {...getFocusProps()}>
          <BasePopover open={open} {...getPopoverProps()}>
            <p>
              Lorem ipsum dolor sit amet
            </p>
          </BasePopover>
        </FocusManager>
      )}
    </div>
  )
}

export default App
```

## Accessibility

* For popover, clicking outside the popover closes it. While in tooltip, moving the cursor away from the target element closes the tooltip.

* Pressing <kbd>Esc</kbd> key closes both popover and tooltip.

* Popover [traps focus](https://developers.google.com/web/fundamentals/accessibility/focus/using-tabindex#modals_and_keyboard_traps) within its content, rotating the focus among its interactive elements.

* The first interactive element receives focus by default when Popover opens.

* The element that serves as the tooltip container has `role="tooltip"`.

* The element that triggers the tooltip has `aria-describedby`.

Example of tooltip accessibility:

```jsx
<Tooltip
  id="my-tooltip"
  target={<a aria-describedby="my-tooltip" href="#">Hover over here</a>}
  >
  Add information here
</Tooltip>
```

[comment]: # "Popover Props"

## Props

### children

React node to render inside Popover.

| type | required | default |
| ---- | -------- | ------- |
| node | true     | N/A     |

### target

Target node that triggers the Popover.

| type | required | default |
| ---- | -------- | ------- |
| node | true     | N/A     |

### open

Decides the open state for Popover.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### size

Size of the Popover.

| type | required | default |
| ---- | -------- | ------- |
| enum | false    | "m"     |

### bezel

Adds padding on all sides.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

### placement

Placement of the Popover with respect to target node.

Popover supports multiple placements:

* `auto` • `auto-start` • `auto-end`
* `top` • `top-start` • `top-end`
* `bottom` • `bottom-start` • `bottom-end`
* `left` • `left-start` • `left-end`
* `right` • `right-start` • `right-end`

| type | required | default  |
| ---- | -------- | -------- |
| enum | false    | "bottom" |

### focusOrder

The order in which focus cycles.

* `reference` - Target element which acts as pivot for Popover.
* `floating` - Popover wrapper element.
* `content` - Content inside Popover wrapper.

By default it's value is \['content'] - Subsequent tabs will cycle through the tabbable contents of the Popover content.

If the value is set to \['floating', 'content'] - Includes floating element in focus cycle.

If the value is set to \['reference', 'content'] - Includes reference element in focus cycle.

* If the value is set to \['reference', 'floating', 'content'] - tabs will cycle through the reference, floating & tabbable contents of the Popover content.

| type    | required | default     |
| ------- | -------- | ----------- |
| arrayOf | false    | ["content"] |

### initialFocus

Element to initially focus when Popover is opened. Can be either a number or a ref.
Number is decided by the tabbable index as specified by the focusOrder.

| type  | required | default |
| ----- | -------- | ------- |
| union | false    | 0       |

### outOfFlow

When Popover is added to a container with `position: fixed` and/or `overflow: hidden`,
it creates a containing block with a stacking context which the Popover can't skip.
In such scenarios, enabling `outOfFlow` will remove Popover from its parent's flow.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### flip

Flips the position of the floating element if there is space constraint
in order to make it visible in viewport.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

### stretch

Enables the Popover to stretch and fill the width of its container. By default, the Popover matches the width of its content.

Strech works only in a relatively positioned container. Refer to the example below.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### shift

Shifts the Popover horizontally to avoid the content from overflowing the viewport.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

### focusTrap

Add focus trap in the content, outside content cannot be accessed if enabled.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

### lowOffset

adds a low spacing between target and Popover.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### mediumOffset

adds a medium spacing between target and Popover.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### highOffset

adds a high spacing between target and Popover.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### noOffset

removes spacing between target and Popover.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### onOpenChange

callback when open state is changed.

| type | required | default |
| ---- | -------- | ------- |
| func | false    | null    |

### returnFocus

determines if focus should be returned to the reference element.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

# BasePopover

[comment]: # "BasePopover Props"

## Props

### children

React node to render inside Base Popover.

| type | required | default |
| ---- | -------- | ------- |
| node | true     | N/A     |

### open

Indicates the open state for Popover.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### size

Size of the Popover.

| type | required | default |
| ---- | -------- | ------- |
| enum | false    | "m"     |

### bezel

Adds padding on all sides.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

### stretch

Enables the Popover to stretch and fill the width of its container. By default, the Popover matches the width of its content.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

### anchorStyles

Adds styles to position the Popover relative to the target element.

| type   | required | default |
| ------ | -------- | ------- |
| object | false    | N/A     |

### inverse

Set to true to render BasePopover with inverse background.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | false   |

# FocusManager

[comment]: # "FocusManager Props"

## Props

### children

React node to render inside Base Popover.

| type | required | default |
| ---- | -------- | ------- |
| node | true     | N/A     |

### popoverContext

context object used to focus on the floating element, pass the `popoverContext` returned by the `usePopover` hook.

| type   | required | default |
| ------ | -------- | ------- |
| object | true     | N/A     |

### focusOrder

The order in which focus cycles.

* `reference` - Target element which acts as pivot for Popover.
* `floating` - Popover wrapper element.
* `content` - Content inside Popover wrapper.

By default it's value is \['content'] - Subsequent tabs will cycle through the tabbable contents of the Popover content.

If the value is set to \['floating', 'content'] - Includes floating element in focus cycle.

If the value is set to \['reference', 'content'] - Includes reference element in focus cycle.

* If the value is set to \['reference', 'floating', 'content'] - tabs will cycle through the reference, floating & tabbable contents of the Popover content.

| type    | required | default     |
| ------- | -------- | ----------- |
| arrayOf | false    | ["content"] |

### focusTrap

Add focus trap in the content, outside content cannot be accessed if enabled.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

### initialFocus

Element to initially focus when Popover is opened. Can be either a number or a ref.
Number is decided by the tabbable index as specified by the focusOrder.

| type  | required | default |
| ----- | -------- | ------- |
| union | false    | 0       |

### returnFocus

determines if focus should be returned to the reference element.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

# Tooltip

[comment]: # "Tooltip Props"

## Props

### children

Tooltip content receives node.

| type | required | default |
| ---- | -------- | ------- |
| node | true     | N/A     |

### target

Target node that triggers the Popover.

| type | required | default |
| ---- | -------- | ------- |
| node | true     | N/A     |

### title

Tooltip title, only receives string.

| type   | required | default |
| ------ | -------- | ------- |
| string | false    | N/A     |

### size

Tooltip size, can be "small", "medium" or "large".

| type | required | default |
| ---- | -------- | ------- |
| enum | false    | "m"     |

### arrow

Set `arrow=false` to disable arrow.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |

### placement

Placement of the Popover with respect to target node.

Popover supports multiple placements:

* `top` • `top-start` • `top-end`
* `bottom` • `bottom-start` • `bottom-end`
* `left` • `left-start` • `left-end`
* `right` • `right-start` • `right-end`

| type | required | default  |
| ---- | -------- | -------- |
| enum | false    | "bottom" |

### bezel

Adds padding on all sides.

| type | required | default |
| ---- | -------- | ------- |
| bool | false    | true    |