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Fix template part focus mode resizable editor height #43408

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Merged
talldan merged 6 commits into from
Aug 22, 2022
Merged

Fix template part focus mode resizable editor height #43408

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021b929
Use a timeout instead of an animation frame
talldan Aug 19, 2022
7cb664e
Reduce latency
talldan Aug 19, 2022
7bee808
Add a regression e2e test
talldan Aug 19, 2022
5568482
Fix comment
talldan Aug 19, 2022
97ff9ad
Remove unstable e2e test
talldan Aug 22, 2022
3101946
Improve comments
talldan Aug 22, 2022
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46 changes: 28 additions & 18 deletions packages/edit-site/src/components/block-editor/resizable-editor.js
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Original file line number Diff line number Diff line change
Expand Up @@ -57,20 +57,31 @@ function ResizableEditor( { enableResizing, settings, children, ...props } ) {
return;
}

let animationFrame = null;
let timeoutId = null;

function resizeHeight() {
if ( ! animationFrame ) {
// Throttle the updates on animation frame.
animationFrame = iframe.contentWindow.requestAnimationFrame(
() => {
setHeight(
iframe.contentDocument.documentElement
.scrollHeight
);
animationFrame = null;
if ( ! timeoutId ) {
// Throttle the updates on timeout. This code previously
// used `requestAnimationFrame`, but that seems to not
// always work before an iframe is ready.
timeoutId = iframe.contentWindow.setTimeout( () => {
const { readyState } = iframe.contentDocument;

// Continue deferring the timeout until the document is ready.
// Only then will it have a height.
if (
readyState !== 'interactive' &&
readyState !== 'complete'
) {
resizeHeight();
return;
}
);

setHeight( iframe.contentDocument.body.scrollHeight );
timeoutId = null;

// 30 frames per second.
}, 1000 / 30 );
}
}

Expand All @@ -82,11 +93,10 @@ function ResizableEditor( { enableResizing, settings, children, ...props } ) {
resizeObserver = new iframe.contentWindow.ResizeObserver(
resizeHeight
);
// Observing the <html> rather than the <body> because the latter
// gets destroyed and remounted after initialization in <Iframe>.
resizeObserver.observe(
iframe.contentDocument.documentElement
);

// Observe the body, since the `html` element seems to always
// have a height of `100%`.
resizeObserver.observe( iframe.contentDocument.body );

resizeHeight();
}
Expand All @@ -97,7 +107,7 @@ function ResizableEditor( { enableResizing, settings, children, ...props } ) {
registerObserver();

return () => {
iframe.contentWindow?.cancelAnimationFrame( animationFrame );
iframe.contentWindow?.clearTimeout( timeoutId );
resizeObserver?.disconnect();
iframe.removeEventListener( 'load', registerObserver );
};
Expand Down Expand Up @@ -153,7 +163,7 @@ function ResizableEditor( { enableResizing, settings, children, ...props } ) {
} }
>
<Iframe
style={ enableResizing ? undefined : deviceStyles }
style={ enableResizing ? { height } : deviceStyles }
head={
<>
<EditorStyles styles={ settings.styles } />
Expand Down