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jpad-button.js
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jpad-button.js
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const html = String.raw;
/**
* A button input element, it can be used standalone or with a controller.
*
* You can also use it with a jpad-tile to contruct more complex layouts easily.
*
* It supports inputs from touchscreen, mouse and keyboard.
*
* @tag jpad-button
*
* @summary A button input element.
*
* @attribute {string} name - reflected attribute of property 'name'
*
* @attribute {boolean} active - reflected attribute of property 'active'
*
* @attribute {boolean} passby - reflected attribute of property 'passby'
*
* @attribute {string} keys - A comma-separated list of the 'KeyboardEvent.code' to listen for
* @attribute {string} key - Alias of 'keys'
*
* @attribute {boolean} trigger - Display the button with a wider variant for alternative types like L or R trigger buttons
*
* @slot - Slot for displaying a button label
*
* @cssproperty [--JpadButton-padding=.2em] - The button outer padding
* @cssproperty [--JpadButton-borderRadius=50%] - The button border radius
* @cssproperty [--JpadButton-minSize=2em] - The button minimum size
* @cssproperty [--JpadButton-background=rgba(150, 150, 150, .6)] - The button default state background
*
* @cssproperty [--JpadButton-active-background=rgba(150, 150, 150, .8)] - The button active state background
*
* @cssproperty [--JpadButton-trigger-padding=.2em 1.5em] - The button trigger variant padding
* @cssproperty [--JpadButton-trigger-borderRadius=.5em] - The button trigger variant border radius
*
* @csspart button - Style the button
*
* @fires buttonpress - Fired when the button is pressed
* @fires buttontrigger - Fired when the button is pressed or released, includes pressed state
* @fires buttonrelease - Fired when the button is released
*/
export class JpadButton extends HTMLElement {
#listeningKeys;
#pressedKeys;
#parentEl;
static get observedAttributes() {
return ['name', 'key', 'keys', 'passby'];
}
constructor() {
super();
this.attachShadow({ mode: 'open' });
this.#listeningKeys = [];
this.#pressedKeys = {};
}
connectedCallback() {
this.shadowRoot.innerHTML = html`
<style>
:host {
--JpadButton-padding: .2em;
--JpadButton-borderRadius: 50%;
--JpadButton-minSize: 2em;
--JpadButton-background: rgba(150, 150, 150, .6);
--JpadButton-active-background: rgba(150, 150, 150, .8);
--JpadButton-trigger-padding: .2em 1.5em;
--JpadButton-trigger-borderRadius: .5em;
display: inline-block;
padding: var(--JpadButton-padding);
border-radius: var(--JpadButton-borderRadius);
}
.Button {
display: grid;
place-items: center;
text-align: center;
min-width: var(--JpadButton-minSize);
min-height: var(--JpadButton-minSize);
border-radius: var(--JpadButton-borderRadius);
line-height: 1;
background: var(--JpadButton-background);
user-select: none;
}
:host([active]) .Button {
background: var(--JpadButton-active-background);
}
:host([trigger]) {
border-radius: var(--JpadButton-trigger-borderRadius);
}
:host([trigger]) .Button {
border-radius: var(--JpadButton-trigger-borderRadius);
padding: var(--JpadButton-trigger-padding);
}
</style>
<div class="Button" part="button">
<slot></slot>
</div>
`;
this.#parentEl = this.closest('jpad-tile') || this.parentNode;
this.addEventListener('touchstart', this.#handleTouchStart);
this.addEventListener('touchend', this.#handleTouchEnd);
this.addEventListener('touchcancel', this.#handleTouchEnd);
this.addEventListener('mousedown', this.#handleMouseStart);
this.addEventListener('mouseup', this.#handleMouseEnd);
this.addEventListener('mouseleave', this.#handleMouseEnd);
this.#registerPassby();
window.addEventListener('keydown', this.#handleKeyPress);
window.addEventListener('keyup', this.#handleKeyPress);
}
disconnectedCallback() {
this.#unregisterPassby();
window.removeEventListener('keydown', this.#handleKeyPress);
window.removeEventListener('keyup', this.#handleKeyPress);
}
#handleTouchStart = e => {
e.preventDefault();
this.active = true;
};
#handleTouchEnd = e => {
e.preventDefault();
this.active = false;
};
#handleMouseStart = () => {
this.active = true;
};
#handleMouseEnd = () => {
this.active = false;
};
#handleOuterTouchMove = e => {
e.preventDefault();
for (const touch of e.targetTouches) {
const touchedElement = this.#getClosestTouchedElement(
touch.clientX,
touch.clientY
);
if (touchedElement && touchedElement === this) {
this.active = true;
return;
}
}
this.active = false;
};
#handleOuterMouseDown = () => {
this.addEventListener('mouseenter', this.#handleOuterMouseEnter, { passive: true });
window.addEventListener('mouseup', this.#handleOuterMouseUp, { passive: true, once: true });
};
#handleOuterMouseEnter = () => {
this.active = true;
};
#handleOuterMouseUp = () => {
this.removeEventListener('mouseenter', this.#handleOuterMouseEnter);
};
#handleKeyPress = e => {
const pressed = !!e.type[5];
if (e.repeat) return;
if (!this.#listeningKeys.includes(e.code)) return;
this.#pressedKeys[e.code] = pressed;
this.active = this.#listeningKeys.some(code => this.#pressedKeys[code]);
};
/**
* @internal
*/
#registerPassby() {
if (this.passby && this.#parentEl) {
this.#parentEl.addEventListener('touchstart', this.#handleOuterTouchMove);
this.#parentEl.addEventListener('touchmove', this.#handleOuterTouchMove);
this.#parentEl.addEventListener('touchend', this.#handleOuterTouchMove);
this.#parentEl.addEventListener('touchcancel', this.#handleOuterTouchMove);
this.#parentEl.addEventListener('mousedown', this.#handleOuterMouseDown);
}
}
/**
* @internal
*/
#unregisterPassby() {
if (this.#parentEl) {
this.#parentEl.removeEventListener('touchstart', this.#handleOuterTouchMove);
this.#parentEl.removeEventListener('touchmove', this.#handleOuterTouchMove);
this.#parentEl.removeEventListener('touchend', this.#handleOuterTouchMove);
this.#parentEl.removeEventListener('touchcancel', this.#handleOuterTouchMove);
this.#parentEl.removeEventListener('mousedown', this.#handleOuterMouseDown);
}
}
/**
* The name of the button's action
* @type {string}
* @reflect
*/
get name() {
return this.getAttribute('name');
}
set name(value) {
this.setAttribute('name', value);
}
/**
* This property is enabled when the button is pressed
* @type {boolean}
* @reflect
*/
get active() {
return this.hasAttribute('active');
}
set active(value) {
if (this.active === value) return;
this.toggleAttribute('active', value);
if (value) this.#sendButtonPress();
else this.#sendButtonRelease();
this.#sendButtonTrigger();
}
/**
* When enabled the element detect touches from outside and by sliding over it, works best when used with a dedicated wrapping element like jpad-tile
* @type {boolean}
* @reflect
*/
get passby() {
return this.hasAttribute('passby');
}
set passby(value) {
this.toggleAttribute('passby', value);
}
/**
* @internal
*/
#sendButtonPress() {
this.dispatchEvent(
new CustomEvent(
'buttonpress',
{
composed: true,
bubbles: true,
detail: {
name: this.name,
},
}
)
);
}
/**
* @internal
*/
#sendButtonTrigger() {
this.dispatchEvent(
new CustomEvent(
'buttontrigger',
{
composed: true,
bubbles: true,
detail: {
name: this.name,
pressed: this.active,
},
}
)
);
}
/**
* @internal
*/
#sendButtonRelease() {
this.dispatchEvent(
new CustomEvent(
'buttonrelease',
{
composed: true,
bubbles: true,
detail: {
name: this.name,
},
}
)
);
}
attributeChangedCallback(name, oldValue, newValue) {
if (oldValue === newValue) return;
switch (name) {
case 'key':
case 'keys':
this.#listeningKeys = newValue.split(',').map(i => i.trim());
return;
case 'passby':
if (this.passby) this.#registerPassby();
else this.#unregisterPassby();
return;
}
}
/**
* @internal
*/
#getClosestTouchedElement(x, y) {
const touchedElement = document.elementFromPoint(x, y);
return touchedElement && touchedElement.closest('jpad-button');
}
}
customElements.define('jpad-button', JpadButton);