Svelte component to display a customisable color picker

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Demo

:red_circle: LIVE DEMO :red_circle:

Installation

yarn add @untemps/svelte-palette

Usage

Basic Usage

<script>
    import { Palette } from '@untemps/svelte-palette'

    const colors = [
        '#865C54',
        '#8F5447',
        '#A65846',
        '#A9715E',
        '#AD8C72',
    ]

    let bgColor = colors[0]
</script>

<main style="--bgColor:{bgColor}">
    <Palette {colors} on:select={({ detail: { color } }) => (bgColor = color)} />
</main>

<style>
    main {
        display: flex;
        align-items: center;
        justify-content: center;
        height: 100%;
        background-color: var(--bgColor);
    }

API

Props	Type	Default	Description
colors	string[] or Promise<string[]> or object[] or Promise<object[]>	[]	Array of colors to be displayed in the palette. See more about colors in the Colors Setting section
selectedColor	string	null	Default selected color. The color must be included in the colors prop.
isCompact	boolean	false	Flag to display the palette in compact mode.
compactColorIndices	number[]	[]	Array of indices to pick from the colors array to be displayed in the compacted palette (see Compact Mode).
allowDuplicates	boolean	false	Flag to allow color duplication.
deletionMode	string	"none"	Mode of slot deletion, between "none" and "tooltip" and "drop" (see Deletion Modes).
tooltipClassName	string	null	Class name to pass down to the deletion tooltip (see Styles).
tooltipContentSelector	string	null	Selector of the deletion tooltip content (see Customize the Content of the Deletion Tooltip).
showTransparentSlot	boolean	false	Flag to display a transparent slot at the start of the slot list.
maxColors	number	30	Maximum number of slots to be displayed in the palette. Set this value to -1 to allow infinite number of slots.
showInput	boolean	false	Flag to display the input within the footer slot.
inputType	string	"text"	Type of the input within the footer slot. Only "text" and "color" are allowed. All other value will be replaced by "text".
numColumns	number	5	Number of columns of the palette grid. This value can't exceed the number of maximum colors defined in maxColors and can't be lower than 1. Set this value to 0 to display the slots on a single row.
transition	object	null	Animation when a slot is rendered (see Transition).

Events

Event	Arguments	Type	Description
select			Dispatched whenever a color is clicked.
	color	string	Selected color string.

Slots

Slot	Description	Available Properties Props
header	Allow to add a header to the palette. By default, it is empty.	selectedColor
footer	Allow to add a footer to the palette. By default, it contains an input to add colors.	selectedColor
slot	Allow to replace the default color slots.	index, color, colorName, selectedColor, transition, isCompact
transparent_slot	Allow to replace the default transparent slot.	-
before_slot	Allow to add an element before the color slots.	selectedColor, transition, isCompact
after_slot	Allow to add an element after the color slots.	selectedColor, transition, isCompact
input	Allow to replace the input in the footer if the default footer slot is kept as it is.	selectedColor, inputType
settings	Allow to replace the settings panel. See the demo to grab a usage example.	onClose
tools	Allow to replace the tools panel.	isCompact, compactColorIndices, onSelect
loader	Allow to replace the loader displayed during the colors async retrieving.	-

Example

<script>
    import { Palette } from '@untemps/svelte-palette'

    const colors = ['#865C54', '#8F5447', '#A65846', '#A9715E', '#AD8C72']
</script>

<Palette {colors}>
    <div slot="header" class="palette__header">
        <h1>Pick a color</h1>
    </div>
    <button let:color slot="slot" class="palette__slot" style="--color:{color}" />
    <div slot="footer" class="palette__footer">
        <a href="https://www.untemps.net">@untemps</a>
    </div>
</Palette>

<style>
    .palette__header {
        display: flex;
        justify-content: center;
    }

    .palette__slot {
        cursor: pointer;
        width: 2rem;
        height: 2rem;
        margin: 0;
        background-color: var(--color);
        border-radius: 20%;
        border: 1px solid rgba(0, 0, 0, 0.2);
        box-shadow: 0.1rem 0.1rem 0.3rem rgba(0, 0, 0, 0.2);
    }

    .palette__footer {
        display: flex;
        justify-content: center;
        padding: 0.5rem;
    }
</style>

Colors Setting

Color can be set in several formats:

Array of Color Strings

colors = ['#865C54', '#8F5447', '#A65846']

Array of Color Objects

colors = [
    { name: 'Color #1', value: '#865C54' },
    { name: 'Color #2', value: '#8F5447' },
    { value: '#A65846' }
]

Promise

A promise to be resolved with an array of color strings or objects can be passed as well (see Use an API to fill the palette)

Deletion Modes

The deletionMode prop allows to define the way users can delete (or not) the color slots:

Value	Description
none	(Default) Color slots cannot be deleted
tooltip	A tooltip is displayed when hovering a color slot, a click within deletes the slot (You can control tooltip display though the tooltipClassName and tooltipContentSelector props)
drop	Colors slots are draggable, a drop outside the palette deletes the slot

As an helper, deletion mode enums are exported in PaletteDeletionMode.

Compact Mode

The compact mode is a way to display a minimal version of the palette with a restricted selection of the original colors and downsized spaces.

The compactColorIndices prop allows to define the list of the colors to be picked from the colors array by their indices.
If set a control is added to toggle the compact mode.

You may also specified whether the palette has to use the compact mode by default by setting isCompact=true.

<script>
    import { Palette } from '@untemps/svelte-palette'

    const colors = ['#865C54', '#8F5447', '#A65846', '#A9715E', '#AD8C72']
    const compactColorIndices = [1, 3, 4]
</script>

<Palette {colors} {compactColorIndices} />

Styles

Root Tag Class

You can style the component by passing a class down to the root tag (div).

• Flag the class as global to make it available in the Palette component
• Prefix your class with .palette[role="main"] to give precedence over the default one or mark each style with !important (not recommanded)

Example

<script>
    import { Palette } from '@untemps/svelte-palette'

    const colors = ['#865C54', '#8F5447', '#A65846', '#A9715E', '#AD8C72']
</script>

<Palette {colors} class="palette__custom" />

<style>
    :global(.palette[role='main'].palette__custom) {
        background: yellow;
    }
</style>

Deletion Tooltip Class

If you set deletionMode to "tooltip", you can pass a class name that is set to the tooltip shown when hovering a slot.

To do so, set a global class name to the tooltipClassName prop.

As the tooltip is interactive, make sure you define a sufficient hover area that allow to access the content of the tooltip before the leave event is triggered.

If you ignore that prop, a default class is used.

Please note that the default class name is __tooltip__default.
Provide a different class name otherwise the default class would have the precedence over the custom one.

Example

<script>
    import { Palette } from '@untemps/svelte-palette'

    const colors = ['#865C54', '#8F5447', '#A65846', '#A9715E', '#AD8C72']
</script>

<Palette {colors} deletionMode="tooltip" tooltipClassName="tooltip" />

<style>
    :global(.tooltip) {
        position: absolute;
        z-index: 9999;
        max-width: 120px;
        background-color: black;
        color: #fff;
        text-align: center;
        border-radius: 6px;
        padding: 0.5rem;
    }
</style>

EyeDropper API Support

If supported by the browser, the default component within the input slot displays a button to trigger the Web EyeDropper API.
The tool allows to pick a color from the screen.

Once selected, the color is inserted in the input waiting for the user to submit and adding it to the palette.

If the API is not available, nothing will be rendered.

The PaletteEyeDropper component can be used on its own anywhere within a slot or in an external component as it is exported from this lib.

Transition

You can customize the way slots appear into the palette by using the transition prop.

This prop works the same way as the in/out directive and accepts an object with two properties :

Value	Description
fn	Transition function (See Svelte Transitions)
args	Parameters to pass to the transition function

fn may be one of the Svelte exported functions or a custom one as described in the docs.

Example

<script>
    import { Palette } from '@untemps/svelte-palette'
    import { elasticOut } from 'svelte/easing'

    const colors = ['#865C54', '#8F5447', '#A65846', '#A9715E', '#AD8C72']

    const whoosh = (node, params) => {
        const existingTransform = getComputedStyle(node).transform.replace('none', '')

        return {
            delay: params.delay || 0,
            duration: params.duration || 400,
            easing: params.easing || elasticOut,
            css: (t, u) => `transform: ${existingTransform} scale(${t})`,
        }
    }
</script>

<Palette {colors} transition={{ fn: whoosh, args: { duration: 3000 } }} />

Recipes

Use an API to Fill the Palette

In case you want to call an API to fetch the palette colors, you may pass a promise to the colors prop.

The component displays a customizable loader waiting to the promise to be resolved. Be aware that the result of the promise must be an array of color strings as well.

Example

<script>
    import { Palette } from '@untemps/svelte-palette'

    const colors = fetch('https://www.colr.org/json/colors/random/30')
        .then((result) => result.json())
        .then((result) => result.colors.filter((c) => c.hex?.length).map((c) => `#${c.hex}`))
</script>

<Palette {colors}>
    <p slot="loader">Loading...</p>
</Palette>

Customize the Content of the Deletion Tooltip

By default, if deletionMode is set to "tooltip", the tooltip displays a trash icon:

You may want to display a different content for various purposes.
That is possible by defining a DOM element selector to the tooltipContentSelector prop.

Note the piece of DOM used ad content is deeply cloned using cloneNode() before appending to the tooltip container.
That means the original element stays as it is but depending on element some props or behaviours may be removed from the clone.

Example

<script>
    import { Palette } from '@untemps/svelte-palette'

    const colors = ['#865C54', '#8F5447', '#A65846', '#A9715E', '#AD8C72']
</script>

<Palette {colors} deletionMode="tooltip" tooltipContentSelector=".palette__tooltip__button" />

<!-- The element used as tooltip content -->
<button class="palette__tooltip__button">Delete</button>

Use a Color Input

By default, the input that allows to add a new slot in the palette is typed as "text".

Although you may use the ìnput slot to display a custom component, it is possible to turn the input into color mode by setting the inputType prop to "color".
That unlocks the color picker provided by the browser. Therefore the color spot and the eyedropper are hidden.

Example

<script>
    import { Palette } from '@untemps/svelte-palette'

    const colors = ['#865C54', '#8F5447', '#A65846', '#A9715E', '#AD8C72']
</script>

<Palette {colors} inputType="color" />

Customize the Tools Panel

The tools panel is a container for two actions:

• Display the settings panel ("settings")
• Toggle the compact mode ("compact")

For some use cases, you may want to provide your own controls by using the tools slot.

To access each tool behaviours, the Palette component exports a onSelect function that has to be called with the name of the tool (use the enums from the exported PaletteTool).

Example

<script>
    import { Palette, PaletteTool } from '@untemps/svelte-palette'

    const colors = ['#865C54', '#8F5447', '#A65846', '#A9715E', '#AD8C72']
</script>

<Palette {colors}>
    <div slot="tools" let:onSelect let:isCompact>
        <button on:click="{onSelect(PaletteTool.SETTINGS)}">Settings</button>
        <button on:click="{onSelect(PaletteTool.COMPACT)}">{isCompact ? 'Expand' : 'Compact'}</button>
    </div>
</Palette>

Development

The component can be served for development purpose on http://localhost:5173/ running:

yarn dev

Contributing

Contributions are warmly welcomed:

• Fork the repository
• Create a feature branch
• Develop the feature AND write the tests (or write the tests AND develop the feature)
• Commit your changes using Angular Git Commit Guidelines
• Submit a Pull Request