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[RNMobile] Update Sandbox component resizing handler by jhnstn · Pull Request #49147 · WordPress/gutenberg · GitHub
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[RNMobile] Update Sandbox component resizing handler #49147

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merged 2 commits into from
Mar 20, 2023

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jhnstn
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@jhnstn jhnstn commented Mar 16, 2023

Updates the native Sandbox component to correctly handle resize events on Android

What?

Updates how the native Sandbox component injects the resize handling script.

Why?

To fix an issue with embeds not resizing correctly on Android: wordpress-mobile/gutenberg-mobile#5565

How?

  • Convert the resize script to a string literal to avoid using toString(). Even with the show source directive, the script was not firing on Android.
  • Use WebView.injectedJavaScript to set up the resize handlers in the web view. Again, the script was not running when injected via a script tag in the wrapper markup.

Testing Instructions

  1. Apply this debugging patch:
diff --git a/packages/components/src/sandbox/index.native.js b/packages/components/src/sandbox/index.native.js
index c3e4e79594..da43347113 100644
--- a/packages/components/src/sandbox/index.native.js
+++ b/packages/components/src/sandbox/index.native.js
@@ -262,6 +262,12 @@ function Sandbox( {
 	}
 
 	function checkMessageForResize( event ) {
+		// DEBUG
+		const platform = Platform.isAndroid ? 'Android' : 'iOS';
+		console.debug(
+			`${ platform } checkMessageForResize`,
+			event.nativeEvent.data
+		);
 		// Attempt to parse the message data as JSON if passed as string.
 		let data = event.nativeEvent.data || {};
  1. Load a post in the mobile editor that contains an embed block.
  2. Verify that the embed looks correct i.e. no visual regressions with embed blocks
  3. Check the metro log for the debug output added in test step 1.

Testing Instructions for Keyboard

Screenshots or screencast

- Converts function to a literal string ( to avoid calling `.toString` )
- Uses `WebView.injectedJavaScript` to inject the resize listeners
`(${ observeAndResizeJS.toString() })();`,
} }
/>
{ customJS && (
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Keeping the ability to inject customJS but I haven't verified if an custom script will work on Android. I'm fine with removing this since it's not verified injecting scripts this way will work.

Instead I can add the customJS override in the injectedJavaScript prop although I'm not sure why we would want the core resize events to be overridden.

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Probably we could also inject the customJS via the injectedJavaScript, instead of adding it to the HTML. Especially if we know that can have issues when running on Android.

Instead I can add the customJS override in the injectedJavaScript prop although I'm not sure why we would want the core resize events to be overridden.

Actually, there's a case for WordPress embeds:

/**
* Checks for WordPress embed events signaling the height change when iframe
* content loads or iframe's window is resized. The event is sent from
* WordPress core via the window.postMessage API.
*
* References:
* window.postMessage: https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage
* WordPress core embed-template on load: https://github.com/WordPress/WordPress/blob/HEAD/wp-includes/js/wp-embed-template.js#L143
* WordPress core embed-template on resize: https://github.com/WordPress/WordPress/blob/HEAD/wp-includes/js/wp-embed-template.js#L187
*/
const observeAndResizeJS = `
( function() {
if ( ! document.body || ! window.parent ) {
return;
}
function sendResize( { data: { secret, message, value } = {} } ) {
if (
[ secret, message, value ].some(
( attribute ) => ! attribute
) ||
message !== 'height'
) {
return;
}
document
.querySelectorAll( 'iframe[data-secret="' + secret + '"' )
.forEach( ( iframe ) => {
if ( +iframe.height !== value ) {
iframe.height = value;
}
} );
// The function postMessage is exposed by the react-native-webview library
// to communicate between React Native and the WebView, in this case,
// we use it for notifying resize changes.
window.ReactNativeWebView.postMessage(JSON.stringify( {
action: 'resize',
height: value,
}));
}
window.addEventListener( 'message', sendResize );
} )();`;

So, I understand that we'll have the same issue on Android for that type of embed.

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In case you want to test a WP embed, you can use the following URL: https://wordpress.org/news/2021/07/tatum/.

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Actually, there's a case for WordPress embeds

Oh awesome, thanks for pointing that out.

So, I understand that we'll have the same issue on Android for that type of embed.

Good news is that custom JS does not call toScript(). It might work in the script tag but since it seems the intent of customJS or at least the expectation is to override the built in resize handler script. Sandbox could probably use a better prop name like observeAndResizeScript but we can save that for another day.

@jhnstn jhnstn requested review from fluiddot and SiobhyB March 16, 2023 21:19
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github-actions bot commented Mar 16, 2023

Size Change: +601 B (0%)

Total Size: 1.34 MB

Filename Size Change
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build/block-library/index.min.js 201 kB +20 B (0%)
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ℹ️ View Unchanged
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build/vendors/react-dom.min.js 41.8 kB
build/vendors/react.min.js 4.02 kB
build/viewport/index.min.js 1.09 kB
build/warning/index.min.js 280 B
build/widgets/index.min.js 7.3 kB
build/widgets/style-rtl.css 1.18 kB
build/widgets/style.css 1.18 kB
build/wordcount/index.min.js 1.06 kB

compressed-size-action

@fluiddot fluiddot added the Mobile App - i.e. Android or iOS Native mobile impl of the block editor. (Note: used in scripts, ping mobile folks to change) label Mar 17, 2023
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LGTM 🎊 ! Thanks for fixing this @jhnstn 🙇 !

I tested different embeds on both platforms and they were rendered properly, including when rotating the device:

  • YouTube: https://www.youtube.com/watch?v=ssfHW5lwFZg
  • Vimeo: https://vimeo.com/278150343
  • Twitter: https://twitter.com/automattic/status/1395447061336711181
  • WP embed: https://wordpress.org/news/2021/07/tatum/

`(${ observeAndResizeJS.toString() })();`,
} }
/>
{ customJS && (
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Probably we could also inject the customJS via the injectedJavaScript, instead of adding it to the HTML. Especially if we know that can have issues when running on Android.

Instead I can add the customJS override in the injectedJavaScript prop although I'm not sure why we would want the core resize events to be overridden.

Actually, there's a case for WordPress embeds:

/**
* Checks for WordPress embed events signaling the height change when iframe
* content loads or iframe's window is resized. The event is sent from
* WordPress core via the window.postMessage API.
*
* References:
* window.postMessage: https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage
* WordPress core embed-template on load: https://github.com/WordPress/WordPress/blob/HEAD/wp-includes/js/wp-embed-template.js#L143
* WordPress core embed-template on resize: https://github.com/WordPress/WordPress/blob/HEAD/wp-includes/js/wp-embed-template.js#L187
*/
const observeAndResizeJS = `
( function() {
if ( ! document.body || ! window.parent ) {
return;
}
function sendResize( { data: { secret, message, value } = {} } ) {
if (
[ secret, message, value ].some(
( attribute ) => ! attribute
) ||
message !== 'height'
) {
return;
}
document
.querySelectorAll( 'iframe[data-secret="' + secret + '"' )
.forEach( ( iframe ) => {
if ( +iframe.height !== value ) {
iframe.height = value;
}
} );
// The function postMessage is exposed by the react-native-webview library
// to communicate between React Native and the WebView, in this case,
// we use it for notifying resize changes.
window.ReactNativeWebView.postMessage(JSON.stringify( {
action: 'resize',
height: value,
}));
}
window.addEventListener( 'message', sendResize );
} )();`;

So, I understand that we'll have the same issue on Android for that type of embed.

packages/components/src/sandbox/index.native.js Outdated Show resolved Hide resolved
`(${ observeAndResizeJS.toString() })();`,
} }
/>
{ customJS && (
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In case you want to test a WP embed, you can use the following URL: https://wordpress.org/news/2021/07/tatum/.

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Flaky tests detected in 2fb6eb3.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4451051580
📝 Reported issues:

@jhnstn jhnstn merged commit 8bfb3f4 into trunk Mar 20, 2023
@jhnstn jhnstn deleted the rnmobile/fix-sandbox-resize branch March 20, 2023 17:52
@github-actions github-actions bot added this to the Gutenberg 15.5 milestone Mar 20, 2023
// get an DOM mutations for that, so do the resize when the window is resized, too.
window.addEventListener( 'resize', sendResize, true );
window.addEventListener( 'orientationchange', sendResize, true );
widow.addEventListener( 'click', sendResize, true );
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@jhnstn I've just noticed window is misspelled here.

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2 participants