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Zoom out: keep original viewport width #61422

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Zoom out: keep original viewport width #61422

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54 changes: 52 additions & 2 deletions packages/block-editor/src/components/iframe/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -320,7 +320,7 @@ function Iframe( {
const shouldRenderFocusCaptureElements = tabIndex >= 0 && ! isPreviewMode;

return (
<>
<ViewportScaling enabled={ ! isPreviewMode }>
{ shouldRenderFocusCaptureElements && before }
{ /* eslint-disable-next-line jsx-a11y/no-noninteractive-element-interactions */ }
<iframe
Expand Down Expand Up @@ -391,7 +391,57 @@ function Iframe( {
) }
</iframe>
{ shouldRenderFocusCaptureElements && after }
</>
</ViewportScaling>
);
}

function ViewportScaling( { children, enabled } ) {
const [ viewportWidth, setViewportWidth ] = useState();
const [ resizeElement, { width: divWidth } ] = useResizeObserver();
const ref = useRefEffect( ( node ) => {
const { ownerDocument } = node;
const { defaultView } = ownerDocument;

setViewportWidth( defaultView.innerWidth );
const onResize = () => {
setViewportWidth( defaultView.innerWidth );
};
defaultView.addEventListener( 'resize', onResize );
return () => {
defaultView.removeEventListener( 'resize', onResize );
};
}, [] );

if ( ! enabled ) {
return children;
}

return (
<div
ref={ ref }
style={ {
height: '100%',
overflow: 'hidden',
} }
>
{ resizeElement }
<div
style={ {
width: `${ viewportWidth }px`,
height: '100%',
} }
>
<div
style={ {
transform: `scale(${ divWidth / viewportWidth })`,
transformOrigin: 'top left',
height: `calc(100% / ${ divWidth / viewportWidth })`,
} }
>
{ children }
</div>
</div>
</div>
);
}

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