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import { getClasses } from '../utils';
import { property } from 'lit/decorators.js';
import { CustomEventType } from '../interfaces';
import { ResizeElement } from '../ResizeElement';
export class Resizer extends ResizeElement {
static styles = css`
:host {
display: block;
position: relative;
width: var(--box-width, 200px);
/* hold the drag-clamp floor against flex compression too, so
shrinking the browser can't squeeze us below minWidth */
min-width: var(--box-min-width, 200px);
--resizer-handle-size: 15px;
}
.resizer {
position: absolute;
right: calc(var(--resizer-handle-size) * -1);
height: 100%;
cursor: col-resize;
padding: 0 calc(var(--resizer-handle-size) / 2);
z-index: 1;
}
.resizer-handle {
position: relative;
width: 4px;
background: rgba(0, 0, 0, 0);
height: 100%;
}
.resizer:hover .resizer-handle {
background: rgba(0, 0, 0, 0.05);
width: 3px;
margin-right: -1px;
}
.resizing .resizer-handle {
background: rgba(0, 0, 0, 0.1) !important;
width: 3px;
margin-right: -1px;
}
slot {
margin-right: var(--resizer-handle-size);
background: red;
}
`;
initialX: number;
boxWidth: number;
@property({ type: Number })
minWidth = 200;
@property({ type: Number })
maxWidth = 2000;
@property({ type: Boolean })
resizing = false;
@property({ type: Number })
currentWidth: number;
constructor() {
super();
this.startResize = this.startResize.bind(this);
this.resize = this.resize.bind(this);
this.stopResize = this.stopResize.bind(this);
}
protected willUpdate(
changes: PropertyValueMap<any> | Map<PropertyKey, unknown>
): void {
super.willUpdate(changes);
// clamp programmatic width sets (e.g. a stored width restored on
// load) the same way drags are clamped
if (changes.has('currentWidth') && this.currentWidth != null) {
this.currentWidth = Math.min(
Math.max(this.currentWidth, this.minWidth),
this.maxWidth
);
}
}
protected updated(
_changedProperties: PropertyValueMap<any> | Map<PropertyKey, unknown>
): void {
super.updated(_changedProperties);
if (_changedProperties.has('currentWidth')) {
this.style.setProperty('--box-width', `${this.currentWidth}px`);
}
if (_changedProperties.has('minWidth')) {
this.style.setProperty('--box-min-width', `${this.minWidth}px`);
}
}
public setWidth(width: number) {
const newWidth = Math.min(Math.max(width, this.minWidth), this.maxWidth);
this.currentWidth = newWidth;
}
startResize(e: MouseEvent) {
this.initialX = e.x;
this.boxWidth = this.offsetWidth;
document.body.style.userSelect = 'none';
this.resizing = true;
window.addEventListener('mousemove', this.resize);
window.addEventListener('mouseup', this.stopResize);
this.requestUpdate();
}
resize(event: MouseEvent) {
const dx = event.x - this.initialX;
this.setWidth(this.boxWidth + dx);
}
stopResize() {
document.body.style.userSelect = 'initial';
window.removeEventListener('mousemove', this.resize);
window.removeEventListener('mouseup', this.stopResize);
this.requestUpdate();
this.resizing = false;
this.fireCustomEvent(CustomEventType.Resized, { width: this.currentWidth });
}
render() {
return html`
<div
class=${getClasses({ resizer: true, resizing: this.resizing })}
@mousedown="${this.startResize}"
>
<div class=${getClasses({ 'resizer-handle': true })}></div>
</div>
<slot></slot>
`;
}
}
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