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26 lines
1021 B
26 lines
1021 B
import {isIOS} from 'app/client/lib/browserInfo';
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import {localStorageBoolObs} from 'app/client/lib/localStorageObs';
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import {dom} from 'grainjs';
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export const viewportEnabled = localStorageBoolObs('viewportEnabled', true);
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export function toggleViewport() {
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viewportEnabled.set(!viewportEnabled.get());
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if (!viewportEnabled.get()) {
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// Removing the meta tag doesn't cause mobile browsers to reload automatically.
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location.reload();
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}
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}
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export function addViewportTag() {
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dom.update(document.head,
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dom.maybe(viewportEnabled, () => {
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// For the maximum-scale=1 advice, see https://stackoverflow.com/a/46254706/328565. On iOS,
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// it prevents the auto-zoom when an input is focused, but does not prevent manual
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// pinch-to-zoom. On Android, it's not needed, and would prevent manual zoom.
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const viewportContent = "width=device-width,initial-scale=1.0" + (isIOS() ? ",maximum-scale=1" : "");
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return dom('meta', {name: "viewport", content: viewportContent});
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})
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);
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}
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