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552 lines
12 KiB
552 lines
12 KiB
import {
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CanvasTexture,
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LinearFilter,
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Mesh,
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MeshBasicMaterial,
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PlaneGeometry,
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sRGBEncoding,
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Color
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} from 'three';
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class HTMLMesh extends Mesh {
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constructor( dom ) {
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const texture = new HTMLTexture( dom );
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const geometry = new PlaneGeometry( texture.image.width * 0.001, texture.image.height * 0.001 );
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const material = new MeshBasicMaterial( { map: texture, toneMapped: false, transparent: true } );
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super( geometry, material );
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function onEvent( event ) {
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material.map.dispatchDOMEvent( event );
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}
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this.addEventListener( 'mousedown', onEvent );
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this.addEventListener( 'mousemove', onEvent );
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this.addEventListener( 'mouseup', onEvent );
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this.addEventListener( 'click', onEvent );
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this.dispose = function () {
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geometry.dispose();
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material.dispose();
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material.map.dispose();
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canvases.delete( dom );
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this.removeEventListener( 'mousedown', onEvent );
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this.removeEventListener( 'mousemove', onEvent );
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this.removeEventListener( 'mouseup', onEvent );
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this.removeEventListener( 'click', onEvent );
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};
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}
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}
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class HTMLTexture extends CanvasTexture {
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constructor( dom ) {
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super( html2canvas( dom ) );
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this.dom = dom;
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this.anisotropy = 16;
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this.encoding = sRGBEncoding;
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this.minFilter = LinearFilter;
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this.magFilter = LinearFilter;
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// Create an observer on the DOM, and run html2canvas update in the next loop
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const observer = new MutationObserver( () => {
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if ( ! this.scheduleUpdate ) {
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// ideally should use xr.requestAnimationFrame, here setTimeout to avoid passing the renderer
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this.scheduleUpdate = setTimeout( () => this.update(), 16 );
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}
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} );
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const config = { attributes: true, childList: true, subtree: true, characterData: true };
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observer.observe( dom, config );
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this.observer = observer;
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}
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dispatchDOMEvent( event ) {
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if ( event.data ) {
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htmlevent( this.dom, event.type, event.data.x, event.data.y );
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}
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}
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update() {
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this.image = html2canvas( this.dom );
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this.needsUpdate = true;
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this.scheduleUpdate = null;
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}
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dispose() {
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if ( this.observer ) {
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this.observer.disconnect();
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}
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this.scheduleUpdate = clearTimeout( this.scheduleUpdate );
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super.dispose();
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}
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}
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//
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const canvases = new WeakMap();
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function html2canvas( element ) {
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const range = document.createRange();
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const color = new Color();
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function Clipper( context ) {
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const clips = [];
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let isClipping = false;
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function doClip() {
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if ( isClipping ) {
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isClipping = false;
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context.restore();
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}
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if ( clips.length === 0 ) return;
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let minX = - Infinity, minY = - Infinity;
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let maxX = Infinity, maxY = Infinity;
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for ( let i = 0; i < clips.length; i ++ ) {
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const clip = clips[ i ];
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minX = Math.max( minX, clip.x );
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minY = Math.max( minY, clip.y );
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maxX = Math.min( maxX, clip.x + clip.width );
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maxY = Math.min( maxY, clip.y + clip.height );
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}
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context.save();
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context.beginPath();
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context.rect( minX, minY, maxX - minX, maxY - minY );
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context.clip();
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isClipping = true;
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}
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return {
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add: function ( clip ) {
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clips.push( clip );
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doClip();
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},
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remove: function () {
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clips.pop();
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doClip();
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}
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};
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}
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function drawText( style, x, y, string ) {
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if ( string !== '' ) {
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if ( style.textTransform === 'uppercase' ) {
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string = string.toUpperCase();
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}
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context.font = style.fontWeight + ' ' + style.fontSize + ' ' + style.fontFamily;
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context.textBaseline = 'top';
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context.fillStyle = style.color;
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context.fillText( string, x, y + parseFloat( style.fontSize ) * 0.1 );
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}
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}
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function buildRectPath( x, y, w, h, r ) {
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if ( w < 2 * r ) r = w / 2;
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if ( h < 2 * r ) r = h / 2;
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context.beginPath();
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context.moveTo( x + r, y );
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context.arcTo( x + w, y, x + w, y + h, r );
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context.arcTo( x + w, y + h, x, y + h, r );
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context.arcTo( x, y + h, x, y, r );
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context.arcTo( x, y, x + w, y, r );
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context.closePath();
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}
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function drawBorder( style, which, x, y, width, height ) {
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const borderWidth = style[ which + 'Width' ];
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const borderStyle = style[ which + 'Style' ];
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const borderColor = style[ which + 'Color' ];
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if ( borderWidth !== '0px' && borderStyle !== 'none' && borderColor !== 'transparent' && borderColor !== 'rgba(0, 0, 0, 0)' ) {
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context.strokeStyle = borderColor;
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context.lineWidth = parseFloat( borderWidth );
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context.beginPath();
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context.moveTo( x, y );
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context.lineTo( x + width, y + height );
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context.stroke();
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}
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}
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function drawElement( element, style ) {
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let x = 0, y = 0, width = 0, height = 0;
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if ( element.nodeType === Node.TEXT_NODE ) {
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// text
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range.selectNode( element );
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const rect = range.getBoundingClientRect();
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x = rect.left - offset.left - 0.5;
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y = rect.top - offset.top - 0.5;
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width = rect.width;
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height = rect.height;
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drawText( style, x, y, element.nodeValue.trim() );
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} else if ( element.nodeType === Node.COMMENT_NODE ) {
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return;
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} else if ( element instanceof HTMLCanvasElement ) {
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// Canvas element
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if ( element.style.display === 'none' ) return;
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context.save();
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const dpr = window.devicePixelRatio;
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context.scale( 1 / dpr, 1 / dpr );
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context.drawImage( element, 0, 0 );
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context.restore();
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} else {
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if ( element.style.display === 'none' ) return;
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const rect = element.getBoundingClientRect();
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x = rect.left - offset.left - 0.5;
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y = rect.top - offset.top - 0.5;
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width = rect.width;
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height = rect.height;
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style = window.getComputedStyle( element );
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// Get the border of the element used for fill and border
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buildRectPath( x, y, width, height, parseFloat( style.borderRadius ) );
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const backgroundColor = style.backgroundColor;
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if ( backgroundColor !== 'transparent' && backgroundColor !== 'rgba(0, 0, 0, 0)' ) {
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context.fillStyle = backgroundColor;
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context.fill();
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}
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// If all the borders match then stroke the round rectangle
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const borders = [ 'borderTop', 'borderLeft', 'borderBottom', 'borderRight' ];
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let match = true;
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let prevBorder = null;
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for ( const border of borders ) {
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if ( prevBorder !== null ) {
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match = ( style[ border + 'Width' ] === style[ prevBorder + 'Width' ] ) &&
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( style[ border + 'Color' ] === style[ prevBorder + 'Color' ] ) &&
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( style[ border + 'Style' ] === style[ prevBorder + 'Style' ] );
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}
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if ( match === false ) break;
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prevBorder = border;
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}
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if ( match === true ) {
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// They all match so stroke the rectangle from before allows for border-radius
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const width = parseFloat( style.borderTopWidth );
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if ( style.borderTopWidth !== '0px' && style.borderTopStyle !== 'none' && style.borderTopColor !== 'transparent' && style.borderTopColor !== 'rgba(0, 0, 0, 0)' ) {
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context.strokeStyle = style.borderTopColor;
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context.lineWidth = width;
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context.stroke();
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}
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} else {
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// Otherwise draw individual borders
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drawBorder( style, 'borderTop', x, y, width, 0 );
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drawBorder( style, 'borderLeft', x, y, 0, height );
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drawBorder( style, 'borderBottom', x, y + height, width, 0 );
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drawBorder( style, 'borderRight', x + width, y, 0, height );
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}
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if ( element instanceof HTMLInputElement ) {
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let accentColor = style.accentColor;
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if ( accentColor === undefined || accentColor === 'auto' ) accentColor = style.color;
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color.set( accentColor );
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const luminance = Math.sqrt( 0.299 * ( color.r ** 2 ) + 0.587 * ( color.g ** 2 ) + 0.114 * ( color.b ** 2 ) );
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const accentTextColor = luminance < 0.5 ? 'white' : '#111111';
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if ( element.type === 'radio' ) {
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buildRectPath( x, y, width, height, height );
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context.fillStyle = 'white';
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context.strokeStyle = accentColor;
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context.lineWidth = 1;
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context.fill();
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context.stroke();
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if ( element.checked ) {
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buildRectPath( x + 2, y + 2, width - 4, height - 4, height );
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context.fillStyle = accentColor;
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context.strokeStyle = accentTextColor;
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context.lineWidth = 2;
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context.fill();
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context.stroke();
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}
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}
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if ( element.type === 'checkbox' ) {
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buildRectPath( x, y, width, height, 2 );
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context.fillStyle = element.checked ? accentColor : 'white';
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context.strokeStyle = element.checked ? accentTextColor : accentColor;
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context.lineWidth = 1;
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context.stroke();
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context.fill();
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if ( element.checked ) {
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const currentTextAlign = context.textAlign;
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context.textAlign = 'center';
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const properties = {
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color: accentTextColor,
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fontFamily: style.fontFamily,
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fontSize: height + 'px',
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fontWeight: 'bold'
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};
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drawText( properties, x + ( width / 2 ), y, '✔' );
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context.textAlign = currentTextAlign;
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}
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}
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if ( element.type === 'range' ) {
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const [ min, max, value ] = [ 'min', 'max', 'value' ].map( property => parseFloat( element[ property ] ) );
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const position = ( ( value - min ) / ( max - min ) ) * ( width - height );
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buildRectPath( x, y + ( height / 4 ), width, height / 2, height / 4 );
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context.fillStyle = accentTextColor;
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context.strokeStyle = accentColor;
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context.lineWidth = 1;
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context.fill();
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context.stroke();
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buildRectPath( x, y + ( height / 4 ), position + ( height / 2 ), height / 2, height / 4 );
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context.fillStyle = accentColor;
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context.fill();
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buildRectPath( x + position, y, height, height, height / 2 );
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context.fillStyle = accentColor;
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context.fill();
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}
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if ( element.type === 'color' || element.type === 'text' || element.type === 'number' ) {
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clipper.add( { x: x, y: y, width: width, height: height } );
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drawText( style, x + parseInt( style.paddingLeft ), y + parseInt( style.paddingTop ), element.value );
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clipper.remove();
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}
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}
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}
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/*
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// debug
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context.strokeStyle = '#' + Math.random().toString( 16 ).slice( - 3 );
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context.strokeRect( x - 0.5, y - 0.5, width + 1, height + 1 );
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*/
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const isClipping = style.overflow === 'auto' || style.overflow === 'hidden';
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if ( isClipping ) clipper.add( { x: x, y: y, width: width, height: height } );
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for ( let i = 0; i < element.childNodes.length; i ++ ) {
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drawElement( element.childNodes[ i ], style );
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}
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if ( isClipping ) clipper.remove();
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}
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const offset = element.getBoundingClientRect();
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let canvas = canvases.get( element );
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if ( canvas === undefined ) {
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canvas = document.createElement( 'canvas' );
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canvas.width = offset.width;
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canvas.height = offset.height;
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canvases.set( element, canvas );
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}
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const context = canvas.getContext( '2d'/*, { alpha: false }*/ );
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const clipper = new Clipper( context );
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// console.time( 'drawElement' );
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drawElement( element );
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// console.timeEnd( 'drawElement' );
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return canvas;
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}
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function htmlevent( element, event, x, y ) {
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const mouseEventInit = {
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clientX: ( x * element.offsetWidth ) + element.offsetLeft,
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clientY: ( y * element.offsetHeight ) + element.offsetTop,
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view: element.ownerDocument.defaultView
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};
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window.dispatchEvent( new MouseEvent( event, mouseEventInit ) );
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const rect = element.getBoundingClientRect();
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x = x * rect.width + rect.left;
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y = y * rect.height + rect.top;
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function traverse( element ) {
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if ( element.nodeType !== Node.TEXT_NODE && element.nodeType !== Node.COMMENT_NODE ) {
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const rect = element.getBoundingClientRect();
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if ( x > rect.left && x < rect.right && y > rect.top && y < rect.bottom ) {
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element.dispatchEvent( new MouseEvent( event, mouseEventInit ) );
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if ( element instanceof HTMLInputElement && element.type === 'range' && ( event === 'mousedown' || event === 'click' ) ) {
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const [ min, max ] = [ 'min', 'max' ].map( property => parseFloat( element[ property ] ) );
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const width = rect.width;
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const offsetX = x - rect.x;
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const proportion = offsetX / width;
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element.value = min + ( max - min ) * proportion;
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element.dispatchEvent( new InputEvent( 'input', { bubbles: true } ) );
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}
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}
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for ( let i = 0; i < element.childNodes.length; i ++ ) {
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traverse( element.childNodes[ i ] );
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}
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}
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}
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traverse( element );
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}
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export { HTMLMesh };
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