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feat(ui): gear to the rail, EDIT on the panel edge, preview undo/redo

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Three creator directives (2026-11-01), done ahead of the surge.

**Gear moved to the preview rail** — first tab, orange (Brush.Attention), gear icon
only. Left-click opens the same app menu the top bar gear owned (Settings / Bug /
Feature / About), right-click goes straight to App Settings; both behaviours moved
with it, so nothing lost an entry point. TopBar keeps the wordmark and EDIT.

**EDIT right edge aligned to the layers panel.** The work area is margin 8 + a 360px
column, the top bar is padding 16, so the shared edge is 352 inside the bar. TopBar
column 0 is now a fixed 352 grid with EDIT right-aligned in it — alignment by
arithmetic instead of by eye.

**Preview undo/redo: Ctrl+Z / Ctrl+Shift+Z.** Models/PreviewHistory snapshots element
REFERENCES plus geometry, visibility, order and membership — a deep clone would mirror
every property of a dozen element subclasses and quietly miss the next one added.
One snapshot per gesture (pushed at drag/resize start, never in the move loop), bounded
at 50, redo survives multiple undos, cleared on layout load. Gated on EditingActive:
undo while the preview shows program output would rewrite a scene nobody is looking at.

Honest scope, in the type's doc comment: layout edits only. Colour/opacity/border/font
edits are not captured yet, so Ctrl+Z after one of those restores the last layout change.

6 tests in PreviewHistoryTests; 19 pass across it and the neighbouring UI classes; Debug
and Release both build at 0 warnings.
This commit is contained in:
gramps
2026-11-01 07:46:10 -08:00
parent bd669f2e73
commit fdb27f0758
14 changed files with 403 additions and 55 deletions
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Controls/TopBar.xaml.cs
-20
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@@ -26,26 +26,6 @@ public partial class TopBar : UserControl
_ = LoadAvatarImageAsync();
}
private void GearButton_PreviewMouseRightButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
// Right-click goes straight to App Settings; the menu stays on left-click.
e.Handled = true;
if (DataContext is MainViewModel { OpenSettingsCommand: { } open } && open.CanExecute(null))
open.Execute(null);
}
private void GearButton_Click(object sender, RoutedEventArgs e)
{
// One menu (Settings / Bug / Feature / About), opened on click — moved up
// from the bottom bar so app-level actions live next to the brand.
if (sender is Button { ContextMenu: { } menu } button)
{
menu.PlacementTarget = button;
menu.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;
menu.IsOpen = true;
}
}
private async System.Threading.Tasks.Task LoadAvatarImageAsync()
{
var vm = DataContext as MainViewModel;