130 lines
3.6 KiB
JavaScript
130 lines
3.6 KiB
JavaScript
/**
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@license
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Copyright (c) 2023 trading_peter
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*/
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import { LitElement, html, css } from 'lit';
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class TpHSplitter extends LitElement {
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static get styles() {
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return [
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css`
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:host {
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display: grid;
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grid-template-rows: 1fr var(--tp-splitter-width, 5px) 1fr;
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}
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:host([tophidden]),
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:host([bottomhidden]) {
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grid-template-rows: 1fr !important;
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}
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[hidden] {
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display: none !important;
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}
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#top,
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#bottom {
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position: relative;
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overflow: hidden;
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}
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#splitter {
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display: flex;
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flex-direction: row;
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align-items: center;
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justify-content: center;
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background: var(--tp-splitter-line-color, #3b3b3b);
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cursor: row-resize;
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opacity: 1;
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z-index: 2;
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}
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#splitter:hover {
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background: var(--tp-splitter-line-color-hover, #007dd1);
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opacity: 0.5;
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}
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`
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];
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}
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render() {
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const { topHidden, bottomHidden } = this;
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return html`
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<div id="top" part="top" ?hidden=${topHidden}><slot name="top"></slot></div>
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<div id="splitter" part="splitter" @mousedown=${this._enableDrag} ?hidden=${topHidden || bottomHidden}><slot name="splitter"></slot></div>
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<div id="bottom" part="bottom" ?hidden=${bottomHidden}><slot name="bottom"></slot></div>
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`;
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}
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static get properties() {
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return {
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topHidden: { type: Boolean, reflect: true },
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bottomHidden: { type: Boolean, reflect: true },
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dragging: { type: Boolean, reflect: true },
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minSideHeight: { type: Number },
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};
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}
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constructor() {
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super();
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this._disableDrag = this._disableDrag.bind(this);
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this._resize = this._resize.bind(this);
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}
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get top() {
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return this.shadowRoot.querySelector('#top');
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}
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get bottom() {
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return this.shadowRoot.querySelector('#bottom');
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}
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get splitter() {
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return this.shadowRoot.querySelector('#splitter')
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}
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disconnectedCallback() {
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super.disconnectedCallback();
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document.removeEventListener('mouseup', this._disableDrag)
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document.removeEventListener('mousemove', this._resize);
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document.body.style['userSelect'] = '';
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}
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_enableDrag(e) {
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document.addEventListener('mouseup', this._disableDrag)
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document.addEventListener('mousemove', this._resize);
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document.body.style['userSelect'] = 'none';
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this._startY = e.clientY;
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this._topHeight = this.top.offsetHeight;
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this.dragging = true;
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}
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_disableDrag() {
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document.removeEventListener('mouseup', this._disableDrag)
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document.removeEventListener('mousemove', this._resize);
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document.body.style['userSelect'] = '';
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this.dragging = false;
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this.dispatchEvent(new CustomEvent('resize-done', { detail: this.style.gridTemplateRows, bubbles: true, composed: true }));
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}
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_resize(e) {
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const delta = e.clientY - this._startY;
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const totalHeight = this.offsetHeight;
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const minHeight = this.minSideHeight || 0;
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// Get splitter width from CSS variable, fallback to 5px.
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const splitterWidth = parseInt(getComputedStyle(this).getPropertyValue('--tp-splitter-width')) || 5;
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// Calculate new top height while ensuring it stays within bounds.
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let newTopHeight = Math.max(minHeight, Math.min(this._topHeight + delta, totalHeight - splitterWidth - minHeight));
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this.style.gridTemplateRows = `${newTopHeight}px ${splitterWidth}px 1fr`;
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this.dispatchEvent(new CustomEvent('resized', { detail: null, bubbles: true, composed: true }));
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}
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}
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window.customElements.define('tp-hsplitter', TpHSplitter);
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