pastilhasandClaude Opus 5
143b34d2d2
The bar is three groups now: how you are looking at it, at what width, and what to do with it. The middle is centred against the BAR rather than against its neighbours, because the outer two change width as sections come and go and a middle that drifted with them would never be in the same place twice. A section OPTS IN, the same way it opts into Save. Most have no preview — Media is a file browser, Administration is a connection form, Messages is an inbox — and offering to view any of them at tablet width offers something that means nothing. A control that does nothing teaches people that controls do nothing. The widths are REAL viewport sizes and the frame is SCALED to fit, never squeezed into whatever the panel has. That distinction is the whole point: an iframe given the panel's width has the site's own media queries answering the PANEL's size, so "Desktop" in a narrow panel renders the tablet layout and labels it desktop — the one thing a preview must not do. Never scaled up either: a 390px phone blown up to fill a wide panel is a phone nobody has, and every judgement made against it is wrong in the direction of "looks fine". 390 is the iPhone width slots.ts already assumes. 834 is iPad portrait, deliberately above the site's md: breakpoint at 768 so it shows the desktop nav rather than the drawer — 768 exactly sits on the boundary and is the least informative width available. 1440 is past the 1280 the content column caps at, so the margins either side are visible rather than implied. View gives the preview the whole panel. That is what makes it worth having: at edit height a phone is a letterbox, and a phone is the width somebody most wants to look at properly. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
97 lines
4.1 KiB
TypeScript
97 lines
4.1 KiB
TypeScript
import { createContext, useCallback, useContext, useEffect, useState, type ReactNode } from 'react';
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/**
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* How the open section is being looked at: editing or just viewing, and at what width.
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*
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* ── Why a context, and the same shape as SaveTarget ──
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*
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* The controls live in DetailPanel's bar and the thing they control lives in the section. DetailPanel
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* deliberately knows nothing about the sections beyond a map of keys to components, so the section
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* announces itself rather than being handed props — exactly as it does for Save.
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*
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* ── Why a section has to OPT IN ──
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*
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* Most sections have no preview. Media is a file browser, Administration is a connection form, Messages
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* is an inbox — offering to view any of them at tablet width is offering something that means nothing,
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* and a control that does nothing teaches people that controls do nothing.
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*
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* So the bar shows these only when the open section says it has a preview, the same way Save renders
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* nothing when there is nothing to save.
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*/
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export type Mode = 'edit' | 'view';
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export type DeviceName = 'desktop' | 'tablet' | 'mobile';
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/**
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* The widths a preview is rendered at, and why these numbers.
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*
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* They are REAL viewport sizes, and the preview is scaled down to fit rather than being given whatever
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* width the panel happens to have. That distinction is the whole point: a "Desktop" preview squeezed
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* into a 900px panel would render the site's tablet layout and call it desktop, which is precisely the
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* lie a preview exists to prevent.
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*
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* mobile 390 — the iPhone width the site's own slot table already assumes (see media/slots.ts,
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* where MOBILE is 342: this minus the layout's 48px of padding)
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* tablet 834 — iPad portrait, and deliberately ABOVE the site's `md:` breakpoint at 768, so it
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* shows the desktop navigation rather than the drawer. A tablet at 768 exactly sits
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* on the boundary and is the least informative width available.
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* desktop 1440 — a common laptop, comfortably past the 1280 the content column caps at, so the
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* margins either side are visible rather than implied.
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*/
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export const DEVICES: Record<DeviceName, { label: string; width: number; height: number }> = {
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desktop: { label: 'Desktop', width: 1440, height: 900 },
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tablet: { label: 'Tablet', width: 834, height: 1112 },
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mobile: { label: 'Mobile', width: 390, height: 844 },
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};
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type ViewModeValue = {
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mode: Mode;
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device: DeviceName;
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setMode: (mode: Mode) => void;
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setDevice: (device: DeviceName) => void;
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/** True while a section with a preview is open. The bar shows its controls only then. */
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previewable: boolean;
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announcePreviewable: (has: boolean) => void;
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};
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const ViewModeContext = createContext<ViewModeValue>({
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mode: 'edit',
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device: 'desktop',
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setMode: () => {},
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setDevice: () => {},
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previewable: false,
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announcePreviewable: () => {},
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});
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export const ViewModeProvider = ({ children }: { children: ReactNode }) => {
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const [mode, setMode] = useState<Mode>('edit');
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const [device, setDevice] = useState<DeviceName>('desktop');
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const [previewable, setPreviewable] = useState(false);
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// Stable, so the effect in `usePreviewable` is not re-run by this provider re-rendering.
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const announcePreviewable = useCallback((has: boolean) => setPreviewable(has), []);
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return (
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<ViewModeContext.Provider value={{ mode, device, setMode, setDevice, previewable, announcePreviewable }}>
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{children}
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</ViewModeContext.Provider>
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);
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};
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/** Read by a section: how it is being looked at. */
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export const useViewMode = (): ViewModeValue => useContext(ViewModeContext);
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/**
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* Called by a section that HAS a preview, so the bar offers the controls.
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*
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* The cleanup clears it, so a section that unmounts leaves no controls behind for a preview that is no
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* longer on screen.
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*/
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export const usePreviewable = (): void => {
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const { announcePreviewable } = useContext(ViewModeContext);
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useEffect(() => {
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announcePreviewable(true);
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return () => announcePreviewable(false);
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}, [announcePreviewable]);
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};
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