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Adding a delayed sim startup to wait for suitable conditions, see #764 …
…and phetsims/tasks#1002
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2019, University of Colorado Boulder | ||
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| /* | ||
| * Delayed simulation/runnable startup so that we can ensure we are in an environment suitable for the sim to start up. | ||
| * See https://github.com/phetsims/chipper/issues/764 for more information. | ||
| * | ||
| * The require.js part is wrapped in a phet.chipper.runRequireJS() method. | ||
| */ | ||
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| (function() { | ||
| 'use strict'; | ||
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| // constants | ||
| const svgns = 'http://www.w3.org/2000/svg'; | ||
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| // Whether phet.chipper.runRequireJS has been called yet. | ||
| let started = false; | ||
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| function isReady() { | ||
| // NOTE: We do NOT care about window.innerWidth/innerHeight. We can start up with those equal to 0, as long as our | ||
| // SVG bounds detection works. See https://github.com/phetsims/tasks/issues/1002. | ||
| if ( !document.body ) { | ||
| return false; | ||
| } | ||
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| // Initialize the container and element, very similar in form to TextBounds.initializeTextBounds() | ||
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| const container = document.createElementNS( svgns, 'svg' ); | ||
| container.setAttribute( 'width', '2' ); | ||
| container.setAttribute( 'height', '2' ); | ||
| container.setAttribute( 'style', 'visibility: hidden; pointer-events: none; position: absolute; left: -65535px; right: -65535px;' ); | ||
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| const element = document.createElementNS( svgns, 'text' ); | ||
| element.appendChild( document.createTextNode( '' ) ); | ||
| element.setAttribute( 'dominant-baseline', 'alphabetic' ); // to match Canvas right now | ||
| element.setAttribute( 'text-rendering', 'geometricPrecision' ); | ||
| element.setAttributeNS( 'http://www.w3.org/XML/1998/namespace', 'xml:space', 'preserve' ); | ||
| container.appendChild( element ); | ||
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| document.body.appendChild( container ); | ||
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| // Equivalent setup to TextBounds.approximateSVGBounds | ||
| element.setAttribute( 'direction', 'ltr' ); | ||
| element.setAttribute( 'font-family', 'Arial' ); | ||
| element.setAttribute( 'font-size', 16 ); | ||
| element.setAttribute( 'font-style', 'normal' ); | ||
| element.setAttribute( 'font-weight', 'normal' ); | ||
| element.setAttribute( 'font-stretch', 'normal' ); | ||
| element.lastChild.nodeValue = 'm'; | ||
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| // Extract the measurement, and see if we have zero bounds. | ||
| const rect = element.getBBox(); | ||
| const result = rect.width !== 0 || rect.height !== 0; | ||
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| // Wait to remove the element until we've measured everything. | ||
| document.body.removeChild( container ); | ||
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| return result; | ||
| } | ||
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| // We can call this anytime to attempt to start things (if they haven't been started already). | ||
| function attemptStart() { | ||
| if ( !started && isReady() ) { | ||
| started = true; | ||
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| phet.chipper.runRequireJS(); | ||
| } | ||
| } | ||
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| // Attempt to start based on timeouts (in case other methods don't work). This will call attemptStart() at least once. | ||
| (function timeoutListener() { | ||
| attemptStart(); | ||
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| if ( !started ) { | ||
| setTimeout( timeoutListener, 1000 ); | ||
| } | ||
| })(); | ||
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| if ( !started ) { | ||
| // Attempt to start on window resizes | ||
| window.addEventListener( 'resize', function resizeListener() { | ||
| attemptStart(); | ||
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| if ( started ) { | ||
| window.removeEventListener( 'resize', resizeListener ); | ||
| } | ||
| } ); | ||
| } | ||
| })(); |