Docsv3.3.0
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Class

TextChangeReason

static

Hierarchical reason string carried by DocumentChanged. Integrators switch on these to react differently to user typing vs paste vs programmatic mutation. Format is dotted-prefix so consumers can match by prefix: input.* is exclusively user-originated (so reason.StartsWith("input.") means "the user did this"), program.* is integrator code, sync.* is network / collaborative sync. Narrower prefixes refine further — e.g. reason.StartsWith("input.type") covers Type and TypeCompose.

public static const string Type

User-driven character input (keyboard, mobile keyboard, on-screen).

public static const string TypeCompose

IME composition commit. Distinguish from plain Type for CJK/emoji autocorrect handling.

public static const string Paste

Paste from system clipboard (Ctrl+V, context-menu, programmatic Paste).

public static const string Delete

Deletion of an explicit range (selection) — no direction.

public static const string DeleteBackward

Backward deletion from the caret — Backspace, word / line-start variants.

public static const string DeleteForward

Forward deletion from the caret — Delete key, word / line-end variants.

public static const string Cut

Cut to clipboard — copy followed by selection deletion.

public static const string Drop

Drag-and-drop text insertion. Reserved; emitted when drop pipeline lands.

public static const string Programmatic

Integrator-driven mutation via SetText / SetTextProgrammatic — not user input, hence outside input.*.

public static const string Format

Autoformat conversion — typed markup replaced by its styling.

public static const string Restore

Undo / Redo replay. User-visible restoration of a prior document state.

public static const string Network

Network / collaborative-sync inbound — not user input, hence outside input.*. Reserved for P2.S.

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