perf(drag-drop): use narrower check for touch events #16082
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googlebot
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Weird idea, but could we just check the first character since we know which event listeners we added in the first place? return event.type[0] === 't'; |
We use the `isTouchEvent` any time we need to normalize something between touch and mouse events which happens for every pixel that the user has dragged. These changes switch to using direct comparison, rather than `startsWith`, which should be slightly faster since there's a narrow set of touch event types.
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That works too, but it'll probably make somebody scratch their head in the future. I've put a comment on it. |
jelbourn
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RudolfFrederiksen
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We use the `isTouchEvent` any time we need to normalize something between touch and mouse events which happens for every pixel that the user has dragged. These changes switch to using direct comparison, rather than `startsWith`, which should be slightly faster since there's a narrow set of touch event types.
andrewseguin
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Jul 2, 2019
We use the `isTouchEvent` any time we need to normalize something between touch and mouse events which happens for every pixel that the user has dragged. These changes switch to using direct comparison, rather than `startsWith`, which should be slightly faster since there's a narrow set of touch event types.
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We use the
isTouchEventany time we need to normalize something between touch and mouse events which happens for every pixel that the user has dragged. These changes switch to using direct comparison, rather thanstartsWith, which should be slightly faster since there's a narrow set of touch event types.