The zoom factor ranges from 10% to 400%.
Setting it
control.Zoom = 1.5; // 150%
control.Zoom = 1.0; // 100%The ZoomChanged event reports changes. Ctrl + mouse wheel is wired up by default and
moves in 10% steps.
Out-of-range values are clamped (GridViewport.MinZoom / MaxZoom).
using unvell.ReoGrid.Core;
using unvell.ReoGrid.Core.Rendering;
viewport.Zoom = 1.5; // 150%. Out-of-range values are clamped
// the visible range accounts for zoom (pass the view size in logical pixels)
var (firstRow, lastRow) = viewport.VisibleRows(600);
var (firstCol, lastCol) = viewport.VisibleColumns(900);A pure view transform
Zoom does not touch the model. Row heights and column widths keep their values; the factor is applied only when drawing.
| Platform | How |
|---|---|
| WinForms | converts to physical pixels as RenderScale = DpiScale × Zoom |
| WPF / Avalonia | applies a ScaleTransform to the DIP drawing |
On a high-DPI display, the display scaling and the zoom multiply. Zooming to 150% on a Windows display set to 150% draws at 225%.
Not the same as print scaling
Screen zoom has no effect on printed output. Print scaling is specified on PrintSettings
(Printing and Page Setup).
PDF export likewise follows the print settings, not viewport.Zoom.
Not saved
The zoom factor is run-time state and is saved to neither reogrid-json nor XLSX. Persisting a per-sheet zoom is future work.
Limitations
- Studio (the desktop host) has no zoom UI yet