User Guide
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17.4 · Advanced Workflows

Undo / Redo and Clipboard Operations

Undo Redo

Ctrl+Z / Ctrl+Y. TX1's undo stack captures the following operation types:

  • Row insert / delete.
  • Row move, indent, outdent.
  • Cell edits (single or bulk).
  • Resource link / unlink.
  • Template apply (whole application undoes as one step).
  • Paste / Copy Assist operations.
  • Markup / margin changes.
  • Code set allocation changes.

What's NOT Undoable

  • Formulas that trigger SET() side-effects (the define change itself is undoable, but subsequent recalculations may look odd).
  • Project creation / deletion.
  • Permission changes.
  • Anything outside the current project (cross-project copy is one-sided).

Undo Depth

Configurable under User Preferences → Undo Depth (default 200 operations). Older operations fall off the stack.

Undo Grouping

Batch operations (bulk verify, template apply, multi-select indent) are a single undo step. If you select 50 rows and indent them, one Ctrl+Z outdents them all.

The Undo Service

IUndoRedoService drives the stack:

  • Each operation carries a forward and reverse delta.
  • Storage is in-memory per project; closing the project clears the stack.

Clipboard

Standard Ctrl+C, Ctrl+X, Ctrl+V.

  • Copy serialises selected rows to TX1's structured clipboard format.
  • Cut behaves like copy then delete (undoable as one step).
  • Paste inserts at the selected row.

Special Clipboard Payloads

  • DirectCostClipboardDto — items + breakdowns + formulas.
  • OverheadClipboardDto — overhead items + breakdowns.
  • ResourceClipboardDto — resources including built-up breakdowns.
  • TemplateClipboardDto — template line items.

Pasting into a compatible view (direct costs ↔ direct costs) preserves everything. Pasting across types triggers Copy Assist's smart mapping (17.2).

Timestamps and Staleness

ClipboardTimestamps records when you copied. If the source entity has changed since, TX1 shows a warning toast on paste.

Paste Special

Edit → Paste Special lets you choose:

  • Paste values only (strip formulas).
  • Paste formulas only.
  • Paste formatting only (bold / colour / style).
  • Paste without resource links.

External Clipboards

Copying from TX1 to external apps (Excel, Word, email) uses text fallback — column-separated by tabs, row-separated by newlines. Pasting back into TX1 uses the TX1 clipboard if present, else falls back to text.