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Components: Add experimental ConfirmDialog #34153

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Proof of Concept
fullofcaffeine Aug 19, 2021
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Improve UX to more closely resembles a native confirm
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18e0231
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2391e35
Address code review suggestions partially, and refactor to use the ex…
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a878802
Improve component by allowing it to be used without the `confirm` hel…
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Update README
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Update confirm call in post-visibility
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Remove role prop as it is not explicitely used at the moment
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0942707
Add basic tests
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7d629b8
Test that the Confirm closes when clicking the overlay
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Test that the Confirm closes when pressing Escape
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Merge branch 'trunk' into replace/confirm-et-al
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Simple naive inline declarative usage without a Context
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21600b0
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29c8c3a
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Make the title optional and adjust some styles
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Fix typo
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Update packages/components/src/confirm-dialog/README.md
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Use `props.children` to pass the dialog message contents
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Update README to reflect the new API
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ciampo Nov 24, 2021
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Temporarily enable knobs
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Sort export alphabetically
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173f2d4
Undo changes to `Modal` component (to be carried out in a separate PR)
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CHANGELOG
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6 changes: 6 additions & 0 deletions docs/manifest.json
Original file line number Diff line number Diff line change
Expand Up @@ -779,6 +779,12 @@
"markdown_source": "../packages/components/src/combobox-control/README.md",
"parent": "components"
},
{
"title": "ConfirmDialog",
"slug": "confirm-dialog",
"markdown_source": "../packages/components/src/confirm-dialog/README.md",
"parent": "components"
},
{
"title": "CustomSelectControl",
"slug": "custom-select-control",
Expand Down
102 changes: 102 additions & 0 deletions packages/components/src/confirm-dialog/README.md
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@@ -0,0 +1,102 @@
# `ConfirmDialog`

<div class="callout callout-alert">
This feature is still experimental. "Experimental" means this is an early implementation subject to drastic and breaking changes.
</div>

`ConfirmDialog` displays a confirmation dialog as a `Modal`, with `OK` and `Cancel` buttons. It's confirmed by clicking `OK` or by pressing the `Enter` key. It's cancelled by clicking `Cancel` or by pressing the `ESC` key or clicking outside the dialog focus (i.e, the overlay).

It's built on top of `Modal`, so you can override any of the `Modal` props if you'd like. This also means that it's added as a child of the `body` element in the DOM tree through a React `Portal`, regardless of where it's declared in the React tree.
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## Usage

`ConfirmDialog` has two main implicit modes: controlled and uncontrolled.

### Uncontrolled mode

Allows the component to be used standalone, just by declaring it as part of another React's component render method:
* It will be automatically open (displayed) upon mounting;
* It will automatically close itself when the `x`, `Cancel`, `Confirm` or overlay is clicked;
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* `onCancel` is not mandatory but can be passed. Even if passed, the dialog will still be able to close itself.

Activating this mode is as simple as omitting the `isOpen` prop. The only mandatory prop, in this case, is the `onConfirm` callback.

```jsx
import {
__experimentalConfirmDialog as ConfirmDialog
} from '@wordpress/components';

function Example() {
return (
<ConfirmDialog onConfirm={ () => console.debug(' Confirmed! ') }>
)
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}
```

### Controlled mode

Let the parent component control when the dialog is open/closed. It's activated when a boolean value is passed to `isOpen`:
* It will not be automatically closed. You need to let it know when to open/close by updating the value of the `isOpen` prop;
* Both `onConfirm` and the `onCancel` callbacks are mandatory props in this mode;
* You'll want to update the state that controls `isOpen` by updating it from the `onCancel` and `onConfirm` callbacks.


```jsx
import {
__experimentalConfirmDialog as ConfirmDialog
} from '@wordpress/components';

function Example() {
const [ isOpen, setIsOpen ] = useState( true );

const handleConfirm = () => {
console.debug( 'Confirmed!' );
setIsOpen( false );
}

const handleCancel = () => {
console.debug( 'Cancelled!' );
setIsOpen( false );
}

return (
<ConfirmDialog isOpen={ isOpen } onConfirm={ handleConfirm } onCancel={ handleCancel }>
)
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}
```

### Unsupported: Multiple instances

Multiple `ConfirmDialog's is an edge case that's currently not officially supported by this component. At the moment, new instances will end up closing the last instance due to the way the `Modal` is implemented (more specifically, because of the use of the `onFocusOutside` to detect a blur in order to close it). This will end up automatically cancelling the previous instance, which might or might not be what you want.
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Suppose you need to handle multiple confirmations without discarding other instances. In that case, it might be better to have a singleton wrapper component that provides a context-based API to trigger the dialog, keeping track of multiple instances. Here's an [example](https://github.com/WordPress/gutenberg/pull/34153#issuecomment-908342367).
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## Custom Types

```ts
type DialogInputEvent =
| KeyboardEvent< HTMLDivElement >
| MouseEvent< HTMLButtonElement >
```

## Props
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### `isOpen`: `boolean`

Defines if the dialog is open (displayed) or closed (not rendered/displayed). It also implicitly toggles the controlled mode if set or the uncontrolled mode if it's not set.

### `onConfirm`: `( event: DialogInputEvent ) => void`

- Required: Yes

The callback that's called when the user confirms. A confirmation can happen when the `OK` button is clicked or when `Enter` is pressed.

### `onCancel`: `(event: DialogInputEvent ) => void`

- Required: Yes if `isOpen` is set, No if `isOpen` is not set
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@ciampo ciampo Sep 23, 2021

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  • Required: Yes if isOpen is set, No if isOpen is not set

Is there any way we can improve this situation, so that we don't have conditionally required props? Maybe the best solution is to make it always required?

Or to expose two different components, one controlled and one uncontrolled? @diegohaz what do you think?

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We could also try experimenting with TypeScript types, something like

type typeA = {
  isOpen?: boolean;
  onCancel?: (event: SyntheticEvent ) => void;
};

// `onCancel` is required if `isOpen` is set
type typeB = {
  isOpen: boolean;
  onCancel: (event: SyntheticEvent ) => void;
};

type union = typeA | typeB;

Not sure.

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Yeah, this is the part I want the most feedback on. I came up with this API as I built the component to look and behave like the native confirm component (and be easy and straightforward to use), while still allowing it to be used as a controlled component. I think it mainly depends on how we plan on consuming this component:

  • If we think it's fine to just use it uncontrolled inline in the components that need it, then yes, we should keep this or break into two components as you said;
  • if we'll instead add more infrastructure around it (like what Diego suggested here) maybe it doesn't make sense to keep the uncontrolled aspect.

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Hey @fullofcaffeine , sorry I haven't had much time to follow up on this. Have you made any changes to how the controlled vs uncontrolled components are exposed, or to how the variables are typed?

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This comment may actually include a good solution for typing this!


The callback that's called when the user cancels. A cancellation can happen when the `Cancel` button is clicked, when the `ESC` key is pressed, or when a click outside of the dialog focus is detected (i.e. in the overlay).

It's not required if `isOpen` is not set (uncontrolled mode), as the component will take care of closing itself, but you can still pass a callback if something must be done upon cancelling (the component will still close itself in this case).

If `isOpen` is set (controlled mode), then it's required, and you need to set the state that defines `isOpen` to `false` as part of this callback if you want the dialog to close when the user cancels.
106 changes: 106 additions & 0 deletions packages/components/src/confirm-dialog/component.tsx
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/**
* External dependencies
*/
// eslint-disable-next-line no-restricted-imports
import React, { useEffect, useState } from 'react';
// eslint-disable-next-line no-restricted-imports
import type { Ref, MouseEvent, KeyboardEvent } from 'react';
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/**
* WordPress dependencies
*/
import { __ } from '@wordpress/i18n';

/**
* Internal dependencies
*/
import Modal from '../modal';
import type { OwnProps, DialogInputEvent } from './types';
import {
useContextSystem,
contextConnect,
WordPressComponentProps,
} from '../ui/context';
import { Flex } from '../flex';
import Button from '../button';
import * as styles from './styles';
import { useCx } from '../utils/hooks/use-cx';

function ConfirmDialog(
props: WordPressComponentProps< OwnProps, 'div', false >,
forwardedRef: Ref< any >
) {
const {
isOpen: isOpenProp,
message,
onConfirm,
onCancel,
...otherProps
} = useContextSystem( props, 'ConfirmDialog' );

const cx = useCx();
const wrapperClassName = cx( styles.wrapper );

const [ isOpen, setIsOpen ] = useState< boolean >();
const [ selfClose, setSelfClose ] = useState< boolean >();

useEffect( () => {
// We only allow the dialog to close itself if `isOpenProp` is *not* set.
// If `isOpenProp` is set, then it (probably) means it's controlled by a
// parent component. In that case, `selfClose` might do more harm than
// good, so we disable it.
const isIsOpenSet = typeof isOpenProp !== 'undefined';
setIsOpen( isIsOpenSet ? isOpenProp : true );
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I wonder what happens if:

  • isOpenProp is set to false — the dialog is not shown
  • later, isOpenProp is unset — would the dialog suddenly show?

Definitely somewhat of an edge case, can be tackled in a follow-up PR

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Hmm, not sure. I can add a test case for that in a follow-up PR, I'll take note!

setSelfClose( ! isIsOpenSet );
}, [ isOpenProp ] );

const handleEvent = ( callback: ( event: DialogInputEvent ) => void ) => (
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Minor, but this could probably be memoised with the useCallback hook

event: DialogInputEvent
) => {
// `onCancel` is optional
callback?.( event );
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if ( selfClose ) {
setIsOpen( false );
}
};

const handleEnter = ( event: KeyboardEvent< HTMLDivElement > ) => {
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if ( event.key === 'Enter' ) {
handleEvent( onConfirm )( event );
}
};

return (
<>
{ isOpen && (
<Modal
title={ message }
overlayClassName={ wrapperClassName }
onRequestClose={ handleEvent( onCancel ) }
onKeyDown={ handleEnter }
closeButtonLabel={ __( 'Cancel' ) }
isDismissible={ true }
forwardedRef={ forwardedRef }
{ ...otherProps }
>
<Flex justify="flex-end">
<Button
variant="secondary"
onClick={ handleEvent( onCancel ) }
>
{ __( 'Cancel' ) }
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Do you think we should allow users of this component to change the Cancel and OK text? We could potentially expose them as string props, something like confirmLabel and cancelLabel ?

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The first version was meant to be a (mostly) 1:1 model of confirm, hence the hardcoded labels, but yep! @jasmussen also suggested it in his comment above.

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I'm considering working on that in a follow-up PR, and include a more detailed review / discussion of the visual design and UX aspects. What do you think? cc @ciampo @jasmussen

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If the design still looks like #34153 (comment), I think we need to at least replace the secondary style cancel button with a tertiary style.

The title wrapping two lines is a bit challenging. The default confirm dialog shows the "Would you like to privately publish this post now?" as just text, not a heading. Can we remove the heading unless explicitly set? I.e. something like:

Screenshot 2021-09-25 at 11 18 48

We do have a little wiggleroom to keep PRs small, but these would be nice changes to get along.

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@jasmussen That's great feedback, thanks! I'll include those changes as part of this changeset.

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@fullofcaffeine fullofcaffeine Oct 8, 2021

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@jasmussen I've implemented the changes you suggested, you can see all scenarios on the storybook for ConfirmDialog, here's a video:

Peek.2021-10-07.18-57.mp4

I could use some feedback regarding the standardization of CSS rules' values. I see some older non-G2 components use some standardized (and sometimes dynamically-calculated) values that are set to SASS variables. I also found what seems to be the equivalent for emotion but not sure what / when to use each. For now, I just hardcoded to good old pixel units. More details here.

cc @ciampo @diegohaz

EDIT: I just noticed I misspelled "privately" in the screencast above as "privetely". Already fixed in the code.

</Button>
<Button
variant="primary"
onClick={ handleEvent( onConfirm ) }
>
{ __( 'OK' ) }
</Button>
</Flex>
</Modal>
) }
</>
);
}

export default contextConnect( ConfirmDialog, 'ConfirmDialog' );
6 changes: 6 additions & 0 deletions packages/components/src/confirm-dialog/index.tsx
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@@ -0,0 +1,6 @@
/**
* Internal dependencies
*/
import ConfirmDialog from './component';

export { ConfirmDialog };
80 changes: 80 additions & 0 deletions packages/components/src/confirm-dialog/stories/index.js
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@@ -0,0 +1,80 @@
/**
* External dependencies
*/
// eslint-disable-next-line no-restricted-imports
import React, { useState } from 'react';
import { text } from '@storybook/addon-knobs';

/**
* Internal dependencies
*/
import Button from '../../button';
import { ConfirmDialog } from '..';

export default {
component: ConfirmDialog,
title: 'Components (Experimental)/ConfirmDialog',
};

// Simplest usage: just declare the component with the required `onConfirm` prop.
export const _default = () => {
const [ confirmVal, setConfirmVal ] = useState( 'Not confirmed' );

return (
<>
<ConfirmDialog
message={ text( 'message', 'Are you sure?' ) }
onConfirm={ () => setConfirmVal( 'Confirmed!' ) }
/>
<h1>{ confirmVal }</h1>
</>
);
};

export const UncontrolledAndWithExplicitOnCancel = () => {
const [ confirmVal, setConfirmVal ] = useState( 'Not confirmed' );

return (
<>
<ConfirmDialog
message={ text( 'message', 'Are you sure?' ) }
onConfirm={ () => setConfirmVal( 'Confirmed!' ) }
onCancel={ () => setConfirmVal( 'Cancelled' ) }
/>
<h1>{ confirmVal }</h1>
</>
);
};

// Controlled `ConfirmDialog`s require both `onConfirm` *and* `onCancel to be passed
// It's expected that the user will then use it to hide the dialog, too (see the
// `setIsOpen` calls below).
export const Controlled = () => {
const [ isOpen, setIsOpen ] = useState( false );
const [ confirmVal, setConfirmVal ] = useState( 'Not confirmed' );

const handleConfirm = () => {
setConfirmVal( 'Confirmed!' );
setIsOpen( false );
};

const handleCancel = () => {
setConfirmVal( 'Cancelled' );
setIsOpen( false );
};

return (
<>
<ConfirmDialog
message={ text( 'message', 'Are you sure?' ) }
isOpen={ isOpen }
onConfirm={ handleConfirm }
onCancel={ handleCancel }
/>
<Button variant="primary" onClick={ () => setIsOpen( true ) }>
Open ConfirmDialog
</Button>
<h1>{ confirmVal }</h1>
</>
);
};
8 changes: 8 additions & 0 deletions packages/components/src/confirm-dialog/styles.ts
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@@ -0,0 +1,8 @@
/**
* External dependencies
*/
import { css } from '@emotion/react';

export const wrapper = css`
z-index: 9999999;
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Is this necessary, even if we use the Modal component (which I assumed already had styles to render on top of every other element)?

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From my tests with the post-visibiliy popover, it is. I'll double-check now and let you know.

`;
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