[Radio] Centering issue in Safari

[YuryShkoda]

Dot in radio button is not centered in Safari for 13 and 15 inches screens. On iphone (checked on iphone Xs), chrome and firefox the dot is perfectly centered.

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Steps to Reproduce 🕹

That is how I style my radio button:

const RadioBtn = withStyles({
    root: {
        color: 'default',
        '&$checked': {
            color: '#604f93',
        },
    },
    checked: {},
})(props => <Radio color="default" {...props} />)

Live example of this issue can be found here: https://www.erudicat.com/heuristic-question-147 or https://www.erudicat.com/monte-carlo-analysis-question-337

Context 🔦

The majority of css rules in my project are scoped to particular components and the fact that I have such issue only in one browser make me assume that the issue is probably with MUI.

Thank you in advance!

Your Environment 🌎

Tech	Version
Material-UI	v4.8.2
React	16.12.0
Browser	Safari v13.0.5

[joshwooding]

Hmm, looks like it might be slightly off.

Above website:

Docs:

Tested on an iPhone. The two examples above don’t look exactly the same either so maybe this doesn’t prove anything...

[oliviertassinari]

@joshwooding Thanks for the confirmation, the solution seems simple: apply the scale transformation to the overlapping svg elements.

[oliviertassinari]

Do you confirm the following?

diff --git a/packages/material-ui/src/Radio/RadioButtonIcon.js b/packages/material-ui/src/Radio/RadioButtonIcon.js
index 8316fe4ed..e8746b1aa 100644
--- a/packages/material-ui/src/Radio/RadioButtonIcon.js
+++ b/packages/material-ui/src/Radio/RadioButtonIcon.js
@@ -9,7 +9,7 @@ export const styles = theme => ({
   root: {
     position: 'relative',
     display: 'flex',
-    '&$checked $layer': {
+    '&$checked $dot': {
       transform: 'scale(1)',
       transition: theme.transitions.create('transform', {
         easing: theme.transitions.easing.easeOut,
@@ -17,7 +17,11 @@ export const styles = theme => ({
       }),
     },
   },
-  layer: {
+  checked: {},
+  background: {
+    transform: 'scale(1)',
+  },
+  dot: {
     left: 0,
     position: 'absolute',
     transform: 'scale(0)',
@@ -26,7 +30,6 @@ export const styles = theme => ({
       duration: theme.transitions.duration.shortest,
     }),
   },
-  checked: {},
 });

Maybe with a comment too?

[joshwooding]

Can confirm that worked :)

Implementation comment for someone who will take this on: We probably don't want to change layer to dot currently just in case it breaks styles. It might be something to include in v5

[oliviertassinari]

Well, it's a private component @ignore - internal component.

[joshwooding]

Do we classify the CSS it exposes as private then?

[oliviertassinari]

As far as I know, developers can't interact with the style of private components, the class names are non-deterministic, not accessible with the theme.

[parthjawale]

Hey, can I work on this?
This would be my first issue.

[joshwooding]

@parthjawale Sure! Hopefully the first of many :)

[parthjawale]

Great and thanks!

[parthjawale]

@joshwooding I tested it on my iPhone 11 Pro. For some reason all radio buttons behave differently.
Tested on the documentation label placement section (https://material-ui.com/components/radio-buttons/#label-placement)
The dot is placed at the left in the first and second case, right for the third case and at the exact center for the last one.

@oliviertassinari The scale transformation fix seems to work sometimes and sometimes not.

Working on a fix.

[oliviertassinari]

@parthjawale Do you have an example when the scale(1) approach doesn't work?

[YuryShkoda]

Hey folks,

Do you have any suggestion how I can fix it in my project until this issue will be fixed in upcoming release?
My project is a PMP Exam Simulator with 1k+ sample questions meaning there are 4k+ radio buttons and it is very important for me to fix it asap.

Thank you in advance.

[joshwooding]

@YuryShkoda you should be able to apply the fix in your theme using overrides. I’ll post a code snippet later.

[oliviertassinari]

@YuryShkoda Do you want to submit a pull request with the proposed fix :)? #19846 (comment)

[YuryShkoda]

@oliviertassinari I've been trying to implement fix, but it was working for some screen resolutions only and I have limited options for tests using real devices, that is why I'm afraid to bring more harm than use. And I have too many radio buttons across my project to risk.

[joshwooding]

@YuryShkoda Sorry it took so long. https://codesandbox.io/s/material-demo-sueb1 - but if you think the fix above won't work then I'm not sure this will work for you. Also the css selector is fragile so use at your own risk :)

[YuryShkoda]

Just tried the fix using scale() and it looks perfect.
root: { "& svg:first-child": { transform: "scale(1)" } }
I was able to test on 4 real screen resolutions.
Huge thanks to everyone!

[anasufana]

Could I try this one?