// Reference: https://github.com/WordPress/gutenberg/blob/f91b4fb4a12e41dd39c9594f24ea1a1a4e23dade/packages/block-editor/src/components/iframe/index.js#L1
// We fork the code from the above link to reduce the unnecessary network requests and improve the performance.
/**
* External dependencies
*/
import classnames from 'classnames';
import {
useState,
createPortal,
forwardRef,
useMemo,
useEffect,
} from '@wordpress/element';
import { __ } from '@wordpress/i18n';
import {
useResizeObserver,
useMergeRefs,
useRefEffect,
useDisabled,
} from '@wordpress/compose';
import { __experimentalStyleProvider as StyleProvider } from '@wordpress/components';
import { useSelect } from '@wordpress/data';
import { store as blockEditorStore } from '@wordpress/block-editor';
function Iframe( {
contentRef,
children,
tabIndex = 0,
scale = 1,
frameSize = 0,
expand = false,
readonly,
forwardedRef: ref,
...props
} ) {
const [ iframeDocument, setIframeDocument ] = useState();
const [ contentResizeListener, { height: contentHeight } ] =
useResizeObserver();
const setRef = useRefEffect( ( node ) => {
node._load = () => {
setIframeDocument( node.contentDocument );
};
}, [] );
const disabledRef = useDisabled( { isDisabled: ! readonly } );
const bodyRef = useMergeRefs( [ contentRef, disabledRef ] );
// Correct doctype is required to enable rendering in standards
// mode. Also preload the styles to avoid a flash of unstyled
// content.
const html = `
`;
const [ src, cleanup ] = useMemo( () => {
const _src = URL.createObjectURL(
new window.Blob( [ html ], { type: 'text/html' } )
);
return [ _src, () => URL.revokeObjectURL( _src ) ];
}, [ html ] );
useEffect( () => cleanup, [ cleanup ] );
// We need to counter the margin created by scaling the iframe. If the scale
// is e.g. 0.45, then the top + bottom margin is 0.55 (1 - scale). Just the
// top or bottom margin is 0.55 / 2 ((1 - scale) / 2).
const marginFromScaling = ( contentHeight * ( 1 - scale ) ) / 2;
return (
<>
);
}
function IframeIfReady( props, ref ) {
const isInitialised = useSelect(
( select ) =>
select( blockEditorStore ).getSettings().__internalIsInitialized,
[]
);
// We shouldn't render the iframe until the editor settings are initialised.
// The initial settings are needed to get the styles for the srcDoc, which
// cannot be changed after the iframe is mounted. srcDoc is used to to set
// the initial iframe HTML, which is required to avoid a flash of unstyled
// content.
if ( ! isInitialised ) {
return null;
}
return ;
}
export default forwardRef( IframeIfReady );