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Allow preview panel to grow on wide displays #4044

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Allow preview panel to grow on wide displays #4044

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0226978
Allow preview panel to grow on wide displays
olivoil Jul 16, 2026
1846b38
Merge branch 'main' into t3code/side-panel-width
olivoil Jul 16, 2026
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13 changes: 13 additions & 0 deletions apps/web/src/components/preview/PreviewPanelShell.test.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
import { describe, expect, it } from "vite-plus/test";

import { getPreviewPanelMaxWidth } from "./PreviewPanelShell";

describe("getPreviewPanelMaxWidth", () => {
it("allows the panel to use 70% of an ultra-wide viewport without a pixel ceiling", () => {
expect(getPreviewPanelMaxWidth(6_000)).toBe(4_200);
});

it("rounds fractional CSS pixels down", () => {
expect(getPreviewPanelMaxWidth(2_001)).toBe(1_400);
});
});
10 changes: 6 additions & 4 deletions apps/web/src/components/preview/PreviewPanelShell.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -10,12 +10,14 @@ export type PreviewPanelMode = "inline" | "sheet" | "sidebar" | "embedded";

const PREVIEW_PANEL_WIDTH_STORAGE_KEY = "t3code:preview-panel-width";
const PREVIEW_PANEL_MIN_WIDTH = 360;
/** Hard ceiling so a wide monitor can't yield a panel that swallows the chat. */
const PREVIEW_PANEL_MAX_WIDTH_PX = 1400;
/** Fraction of the viewport allowed; the panel is min(this · vw, MAX_PX). */
/** Fraction of the viewport allowed, preserving the remaining space for chat. */
const PREVIEW_PANEL_MAX_WIDTH_FRACTION = 0.7;
const PREVIEW_PANEL_DEFAULT_WIDTH = 540;

export function getPreviewPanelMaxWidth(viewportWidth: number): number {
return Math.floor(viewportWidth * PREVIEW_PANEL_MAX_WIDTH_FRACTION);
}

/**
* Shell for the preview panel. In inline mode the panel is user-resizable
* via a drag handle on the left edge; width persists per browser. In
Expand Down Expand Up @@ -82,5 +84,5 @@ function useViewportClampedMaxWidth(): number {
if (frame !== 0) window.cancelAnimationFrame(frame);
};
}, []);
return Math.min(PREVIEW_PANEL_MAX_WIDTH_PX, Math.floor(vw * PREVIEW_PANEL_MAX_WIDTH_FRACTION));
return getPreviewPanelMaxWidth(vw);
}
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