feat: show previous PDF document while the next one is being created & rendered #91
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This PR adds a second
<Document />
component when PdfViewer detects that the new value is being either still being converted by react-pdf/renderer or being rendered by React-PDF.I used React-PDF's
<Page />
'sonRenderSuccess
prop to inform PdfViewer that the PDF has been fully rendered. It does this by setting previously rendered PDF blob URL to component's state.The second
<Document />
component holds previous blob URL, while the "main"<Document />
, as before, holds the latest value at all times.By manually managing
key
props, React prevents updates to whatever component renders previous value, keeping it visible on the screen while the new one is loading.