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- The workbook's active sheet is an atomic set in place (Workbook::active_sheet /
set_active_sheet), so a window swap or sheet switch never clones the
Arc<Workbook> or marks it dirty. Selections already live in DocState and the
window views. Save records the sheet of the most recently active window.
- A dialog taken out of its window while it runs goes back to that window when
a command run from it switched windows (dialogs::show, ui.dialog.confirm).
- view.arrangeAll {arrange?: tiled|horizontal|vertical|cascade, activeWorkbook?}
returns the visible windows, active first; the desktop moves and sizes the
native windows over the main window's monitor. New Window and Arrange All
buttons on the View ribbon; Arrange Windows dialog.
- Docs: ui-parity, hardware-parity, gaps #20, target-app-parity, ROADMAP.
29 lines
3.6 KiB
Markdown
29 lines
3.6 KiB
Markdown
# Hardware parity
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> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-22 · **Change:** minor (Arrange All) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
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The hardware Excel uses, per platform, against GridCraft. Part of
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[target-app-parity.md](target-app-parity.md). **Hardware: ~40% ready, 25–40 h** (estimated).
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| Hardware feature | Excel | GridCraft (macOS · Windows · Linux · BSD · web) | Gap and estimate |
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|---|---|---|---|
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| Multi-core recalculation | Multi-threaded recalculation on all cores (Windows and Mac), configurable thread count | Single-threaded everywhere (no threading in `crates/calc`) | Parallel recalc of independent dependency chains on native builds; WASM stays single-threaded or uses workers later: 12–18 h |
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| GPU rendering of the grid and charts | DirectX / Metal accelerated drawing | wgpu: Metal · DirectX 12 (default since 10-08; OpenGL when DirectX 12 has no GPU driver or fails to start; Vulkan only on request, so the Intel UHD `igvk64.dll` crash (#120) can't happen; shaders compiled with FXC, so no DXC runtime is needed, #339) · Vulkan/GL · Vulkan/GL · WebGPU or WebGL2 | At parity in kind. Driver problems: screen flashing on Windows 11 (#76): 2–4 h |
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| Pen and touch (Draw tab) | Pen pressure and tilt, eraser end, touch mode, Ink to Shape, ink replay | Pen, highlighter, eraser, Ink to Shape with mouse/pen input; **no pressure or tilt**, no touch mode | Pressure-sensitive strokes where winit reports force; touch-friendly ribbon spacing: 4–6 h |
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| Trackpad and mouse | Smooth scrolling, pinch zoom, horizontal scroll, Magic Mouse | Smooth scrolling and zoom via egui | Verify pinch zoom on each platform: 1–2 h |
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| Multiple windows and monitors | One window per workbook, New Window for the same workbook, per-monitor DPI | A native window per workbook window on the desktop, New Window for the same workbook; new windows cascade from the last one on its monitor; View › Arrange All tiles, stacks or cascades them over the main window's monitor (web: one window) | Arrange All across monitors; verify per-monitor DPI with windows on two monitors: 2–3 h |
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| High-DPI and display scaling | yes | yes (display scale matched to desktop density; View › Interface size 75–200 % on top, #230) | — |
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| Accessibility hardware (screen readers, braille displays, switch control) | Narrator, JAWS, NVDA, VoiceOver | AccessKit enabled in eframe; grid cells and ribbon not yet exposed as an accessible tree | Counted under UI ([ui-parity.md](ui-parity.md)) |
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| Printers | System print with driver options | Desktop submits through craft-print with printer choice, copies, duplex and grayscale; web browser printing | Counted under print |
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## Revision history
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| Date | Change | Summary |
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|---|---|---|
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| 2026-10-22 | minor | View › Arrange All over the main window's monitor. |
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| 2026-10-22 | minor | Multiple windows: each workbook window is a native window of its own (desktop). |
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| 2026-10-12 | minor | Desktop File > Print now discovers printers and submits PDF jobs through pinned craft-print with printer choice, copies, duplex and grayscale; browser printing and PDF export remain available. Remaining print parity includes page ranges and driver-specific tray/options UI; physical printer fidelity needs hardware validation. |
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| 2026-10-11 | trivial | Windows: DirectX 12 shaders compiled with FXC, no DXC runtime needed (#339, #354) |
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| 2026-10-11 | trivial | Windows: OpenGL fallback when DirectX 12 has no GPU or fails to start; Vulkan never by default (#120) |
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| 2026-10-10 | major | Created: single-threaded calc, wgpu rendering, no pen pressure, single window |
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