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import { property } from 'lit/decorators.js';
import { RapidElement } from '../RapidElement';
import { getClasses } from '../utils';
import { CustomEventType } from '../interfaces';
import { styleMap } from 'lit-html/directives/style-map.js';
export class Dropdown extends RapidElement {
static get styles() {
return css`
:host {
}
.wrapper {
position: relative;
}
.toggle {
cursor: pointer;
}
.dropdown-wrapper {
position: relative;
overflow: auto;
}
.dropdown:focus {
}
.dropdown.dormant {
height: 0;
overflow: hidden;
}
.dropdown {
position: fixed;
z-index: 2;
padding: 0;
opacity: 0;
border-radius: calc(var(--curvature) * 1.5);
background: #fff;
transition:
opacity calc(0.8 * var(--transition-speed)) var(--bounce),
transform calc(0.8 * var(--transition-speed)) var(--bounce);
user-select: none;
margin-top: 0px;
margin-left: 0px;
transform: translateY(0) scale(1);
box-shadow: var(--dropdown-shadow);
}
.dropdown:focus {
outline: none;
}
.arrow {
content: '';
width: 0px;
height: 0;
z-index: 10;
position: absolute;
border-left: 6px solid transparent;
border-right: 6px solid transparent;
border-bottom: 6px solid white;
}
.open .dropdown {
opacity: 1;
transform: translateY(0.5em) scale(1);
}
.mask {
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
background: rgba(0, 0, 0, 0.7);
opacity: 0.5;
transition: opacity var(--transition-speed) ease-in-out;
pointer-events: none;
z-index: 1;
}
.mask.open {
opacity: 1;
pointer-events: auto;
}
.right {
right: 0;
}
`;
}
@property({ type: Boolean })
open = false;
@property({ type: Boolean })
dormant = true;
@property({ type: Number })
arrowSize = 8;
@property({ type: Number })
margin = 10;
@property({ type: Boolean })
mask = false;
dropdownStyle: Record<string, string> = {};
arrowStyle: Record<string, string> = {};
constructor() {
super();
this.calculatePosition = this.calculatePosition.bind(this);
}
private activeFocus: any;
private blurHandler: any;
private resetBlurHandler() {
const dropdown = this.shadowRoot.querySelector(
'.dropdown'
) as HTMLDivElement;
if (this.activeFocus) {
this.activeFocus.removeEventListener('blur', this.blurHandler);
}
this.activeFocus = dropdown;
this.blurHandler = this.handleBlur.bind(this);
this.activeFocus.addEventListener('blur', this.blurHandler);
}
private handleBlur(event: FocusEvent) {
const newTarget = event.relatedTarget as any;
if (this.contains(newTarget)) {
newTarget.addEventListener('blur', this.blurHandler);
this.activeFocus = newTarget;
} else {
this.closeDropdown();
}
}
private openDropdown() {
// reset position so calculatePosition() sees the natural bounds
this.dropdownStyle = {};
this.arrowStyle = {};
this.open = true;
this.dormant = false;
this.resetBlurHandler();
const dropdown = this.shadowRoot.querySelector(
'.dropdown'
) as HTMLDivElement;
dropdown.focus();
dropdown.click();
this.fireCustomEvent(CustomEventType.Opened);
}
private closeDropdown() {
this.activeFocus.removeEventListener('blur', this.blurHandler);
this.open = false;
window.setTimeout(() => {
this.dormant = true;
}, 250);
this.blur();
}
public updated(changedProperties: Map<string, any>) {
super.updated(changedProperties);
if (changedProperties.has('open') && this.open) {
// defer to avoid scheduling an update during the current cycle;
// the dropdown transitions from opacity 0 so this is not visible
setTimeout(() => this.calculatePosition(), 0);
}
}
public calculatePosition() {
const dropdown = this.shadowRoot.querySelector(
'.dropdown'
) as HTMLDivElement;
const toggle = this.querySelector('*[slot="toggle"]');
const arrow = this.shadowRoot.querySelector('.arrow') as HTMLDivElement;
let bumpedUp = false;
let bumpedLeft = false;
if (dropdown && toggle) {
const dropdownBounds = dropdown.getBoundingClientRect();
const toggleBounds = toggle.getBoundingClientRect();
const arrowBounds = arrow.getBoundingClientRect();
if (!toggle) {
return;
}
const dropdownStyle = {
border: '1px solid rgba(0,0,0,0.1)',
marginTop: '0.5em'
};
// if off the the right, bump it left
if (dropdownBounds.right > window.innerWidth) {
dropdownStyle['left'] =
toggleBounds.right - dropdownBounds.width + 'px';
delete dropdownStyle['right'];
bumpedLeft = true;
}
// if off to the bottom, bump it up
if (dropdownBounds.bottom > window.innerHeight) {
dropdownStyle['top'] = toggleBounds.top - dropdownBounds.height + 'px';
dropdownStyle['marginTop'] = '-0.5em';
bumpedUp = true;
}
// if our arrow is aligned with the left of the dropdown, scootch
// the dropdown left a pinch so our arrow still overlaps properly
let arrowLeft = toggleBounds.width / 2 - arrowBounds.width / 2;
if (arrowLeft <= 0) {
dropdownStyle['marginLeft'] = '-10px';
arrowLeft = 10;
}
const arrowStyle = {
left: arrowLeft + 'px',
borderWidth: this.arrowSize + 'px',
top: '-' + this.arrowSize + 'px'
};
if (bumpedUp) {
// rotate our arrow 180 degrees
arrowStyle['transform'] = 'rotate(180deg)';
// and place it at the bottom of the dropdown
arrowStyle['top'] = 'auto';
arrowStyle['bottom'] = '-' + this.arrowSize + 'px';
}
if (bumpedLeft) {
arrowStyle['right'] =
toggleBounds.width / 2 - arrowBounds.width / 2 + 'px';
delete arrowStyle['left'];
}
this.arrowStyle = arrowStyle;
this.dropdownStyle = dropdownStyle;
}
this.requestUpdate();
}
public handleToggleClicked(event: MouseEvent): void {
event.preventDefault();
event.stopPropagation();
if (!this.open && this.dormant) {
this.openDropdown();
}
}
public render(): TemplateResult {
return html`
${this.mask
? html`<div class="mask ${this.open ? 'open' : ''}" />`
: null}
<div
class="wrapper ${getClasses({
open: this.open
})}"
>
<slot
name="toggle"
class="toggle"
@click=${this.handleToggleClicked}
></slot>
<div
class="${getClasses({
dropdown: true,
dormant: this.dormant
})}"
style=${styleMap(this.dropdownStyle)}
tabindex="0"
>
<div class="arrow" style=${styleMap(this.arrowStyle)}></div>
<div class="dropdown-wrapper">
<slot name="dropdown" tabindex="1"></slot>
</div>
</div>
</div>
`;
}
}
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