FormRedo method

此 API 条目保留标识符、签名、代码块和 PDF 术语的原始形式。

Redoes the most recently undone edit on the focused AcroForm widget, driving PDFium's per-widget redo history.

FormRedo is the counterpart to FormUndo — it re-applies the most recently undone edit on the focused AcroForm widget. Each widget maintains its own redo stack inside PDFium's form-fill engine. After a series of FormUndo calls the redo stack grows; making a fresh edit clears the redo stack (standard text-editor convention).

Returns True on success, False when there is nothing to redo or when the view is inactive / has no focused widget. Pair with FormCanRedo to drive a Redo menu item's Enabled state.

• FormRedo is widget-local — it only re-applies edits on the FOCUSED widget; cross-widget redo requires application-level edit history.
• Like FormUndo, FormRedo fires the same JavaScript form events that a regular edit would, so any document scripts run as expected.
• The redo stack is cleared on document reload, widget focus change, or page change.

FormUndo, FormCanRedo, FormCanUndo