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- è€éãªCSSã®çè§£ïŒ è€éãªCSSã¢ãŒããã¯ãã£ïŒäŸïŒCSS-in-JSãå€§èŠæš¡ãªã¹ã¿ã€ã«ã·ãŒãã®äœ¿çšïŒãæ±ãéã«ãã¹ã〠ã«ãŒã«ã¯ã¹ã¿ã€ã«ãã©ã®ããã«é©çšãããCSSã®ç°ãªãéšåãã©ã®ããã«çžäºäœçšããããçè§£ããã®ã«åœ¹ç«ã¡ãŸãã
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1. JavaScriptãšMutationObserverã䜿çšãã
MutationObserver APIã¯ãDOMããªãŒã®å€æŽãç£èŠããæ¹æ³ãæäŸããŸããããã䜿çšããŠãèŠçŽ ã®style屿§ã®å€æŽãæ€åºã§ããŸãã以äžã«äŸã瀺ããŸãïŒ
function createCSSSpy(element, property, callback) {
const observer = new MutationObserver((mutations) => {
mutations.forEach((mutation) => {
if (mutation.type === 'attributes' && mutation.attributeName === 'style') {
if (element.style[property]) {
callback(element.style[property]);
}
}
});
});
observer.observe(element, {
attributes: true,
attributeFilter: ['style']
});
return observer;
}
// Example usage:
const myElement = document.getElementById('myElement');
const spy = createCSSSpy(myElement, 'backgroundColor', (value) => {
console.log(`Background color changed to: ${value}`);
});
// To stop observing:
// spy.disconnect();
説æïŒ
createCSSSpy颿°ã¯ãèŠçŽ ãç£èŠããCSSããããã£ãã³ãŒã«ããã¯é¢æ°ãåŒæ°ãšããŠåããŸãã- æå®ãããèŠçŽ ã®å±æ§å€æŽãç£èŠããããã«
MutationObserverãäœæãããŸãã - ãªãã¶ãŒããŒã¯
style屿§ã®å€æŽã®ã¿ãç£èŠããããã«èšå®ãããŸãã style屿§ã倿Žããããšãæå®ãããCSSããããã£ã®æ°ããå€ãšãšãã«ã³ãŒã«ããã¯é¢æ°ãå®è¡ãããŸãã- ãã®é¢æ°ã¯ãªãã¶ãŒããŒãè¿ããããåŸã§ãããåæããŠå€æŽã®ç£èŠã忢ããããšãã§ããŸãã
2. çµã¿èŸŒã¿ããã¯ãæã€CSS-in-JSã©ã€ãã©ãªã䜿çšãã
å€ãã®CSS-in-JSã©ã€ãã©ãªïŒäŸïŒstyled-componentsãEmotionïŒã¯ãã¹ã¿ã€ã«ã®å€æŽãç£èŠããããã®çµã¿èŸŒã¿ããã¯ãã¡ã«ããºã ãæäŸããŠããŸãããããã®ããã¯ã䜿çšããããšã§ãCSSã¹ã〠ã«ãŒã«ãããç°¡åã«å®è£ ã§ããŸãã
styled-componentsã䜿çšããäŸïŒ
import styled, { useTheme } from 'styled-components';
import { useEffect } from 'react';
const MyComponent = styled.div`
background-color: ${props => props.bgColor};
`;
function MyComponentWithSpy(props) {
const theme = useTheme();
useEffect(() => {
console.log(`Background color changed to: ${props.bgColor}`);
}, [props.bgColor]);
return Hello ;
}
//Usage:
//
ãã®äŸã§ã¯ãuseEffectããã¯ã䜿çšããŠbgColorããããã£ã倿Žããããã³ã«ã¡ãã»ãŒãžããã°ã«èšé²ããäºå®äžbackground-colorããããã£ã«å¯ŸããCSSã¹ã〠ã«ãŒã«ãšããŠæ©èœãããŠããŸãã
3. ãã©ãŠã¶ã®éçºè ããŒã«ã䜿çšãã
çŸä»£ã®ãã©ãŠã¶éçºè ããŒã«ã¯ãCSSã¹ã¿ã€ã«ãæ€æ»ã»ç£èŠããããã®åŒ·åãªæ©èœãæäŸããŸããå®å šãªèªååãœãªã¥ãŒã·ã§ã³ã§ã¯ãããŸããããéçºäžã«æåã§CSSã®æåã芳å¯ããããã«äœ¿çšã§ããŸãã
- èŠçŽ ã€ã³ã¹ãã¯ã¿ãŒïŒ èŠçŽ ã€ã³ã¹ãã¯ã¿ãŒã䜿çšããŠãèŠçŽ ã®èšç®æžã¿ã¹ã¿ã€ã«ã衚瀺ãããªã¢ã«ã¿ã€ã ã§å€æŽã远跡ããŸãã
- ãã¬ãŒã¯ãã€ã³ãïŒ CSSãŸãã¯JavaScriptã³ãŒãã«ãã¬ãŒã¯ãã€ã³ããèšå®ããŠå®è¡ãäžæåæ¢ããç¹å®ã®æç¹ã§ã®ã¹ã¿ã€ã«ã®ç¶æ ãæ€æ»ããŸãã
- ããã©ãŒãã³ã¹ãããã¡ã€ã©ïŒ ããã©ãŒãã³ã¹ãããã¡ã€ã©ã䜿çšããŠãCSSã®å€æŽããŠã§ãã¢ããªã±ãŒã·ã§ã³ã®ããã©ãŒãã³ã¹ã«äžãã圱é¿ãåæããŸãã
CSSã¹ã〠ã«ãŒã«ã®å®è·µçãªäœ¿çšäŸ
以äžã«ãCSSã¹ã〠ã«ãŒã«ãå®éã®ã·ããªãªã§ã©ã®ããã«äœ¿çšã§ãããã®å®è·µçãªäŸãããã€ã玹ä»ããŸãïŒ
1. ãããŒå¹æã®ç£èŠ
ãããŒå¹æãç°ãªããã©ãŠã¶ã§æ£ããäžè²«ããŠé©çšãããããšãæ€èšŒããŸããCSSã¹ã〠ã«ãŒã«ã䜿çšããŠãèŠçŽ ã«ã«ãŒãœã«ã眮ããããšãã®background-colorãcolorããŸãã¯box-shadowããããã£ã®å€æŽã远跡ã§ããŸãã
const button = document.querySelector('button');
const hoverSpy = createCSSSpy(button, 'backgroundColor', (value) => {
console.log(`Button background color on hover: ${value}`);
});
2. ã¢ãã¡ãŒã·ã§ã³ç¶æ ã®è¿œè·¡
CSSã¢ãã¡ãŒã·ã§ã³ããã©ã³ãžã·ã§ã³ã®é²è¡ç¶æ³ãç£èŠããŸããCSSã¹ã〠ã«ãŒã«ã䜿çšããŠãã¢ãã¡ãŒã·ã§ã³äžã®transformãopacityãwidthãªã©ã®ããããã£ã®å€æŽã远跡ã§ããŸãã
const animatedElement = document.getElementById('animatedElement');
const animationSpy = createCSSSpy(animatedElement, 'transform', (value) => {
console.log(`Element transform during animation: ${value}`);
});
3. ã¬ã¹ãã³ã·ããã¶ã€ã³ã®æ€èšŒ
ãŠã§ããµã€ããç°ãªãç»é¢ãµã€ãºã«æ£ããé©å¿ããããšã確èªããŸããCSSã¹ã〠ã«ãŒã«ã䜿çšããŠãç°ãªããã¬ãŒã¯ãã€ã³ãã§ã®widthãheightãfont-sizeãªã©ã®ããããã£ã®å€æŽã远跡ã§ããŸãã
const responsiveElement = document.getElementById('responsiveElement');
const responsiveSpy = createCSSSpy(responsiveElement, 'width', (value) => {
console.log(`Element width at current breakpoint: ${value}`);
});
4. CSSã®ç«¶åã®ãããã°
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äŸãã°ãç«¶åããã¹ã¿ã€ã«ãæã€ãã¿ã³ããããšããŸããCSSã¹ã〠ã«ãŒã«ã䜿çšããŠcolorãšbackground-colorããããã£ãç£èŠããã©ã®ã¹ã¿ã€ã«ãã©ã®ãããªé åºã§é©çšãããŠãããã確èªã§ããŸããããã«ãããç«¶åã®åå ãç¹å®ããããã«å¿ããŠCSSã調æŽããã®ã«åœ¹ç«ã¡ãŸãã
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