FormCanRedo method

此 API 條目保留識別符號、簽名、程式碼塊和 PDF 術語的原始形式。

Reports whether the focused AcroForm widget has at least one undone edit to redo.

FormCanRedo wraps PDFium's FORM_CanRedo. It returns True when the FOCUSED AcroForm widget has at least one undone edit in its redo stack that FormRedo could re-apply, and False otherwise.

Returns False safely when the view is inactive, the document has no AcroForm, or no widget is focused.

Making a fresh edit (typing, paste, etc.) clears the redo stack — FormCanRedo flips to False after the next edit. This matches the standard text-editor convention.

• FormCanRedo is the natural Enabled-state expression for a Redo menu item, toolbar button, or context-menu entry.
• Like FormCanUndo, FormCanRedo is per-widget — the answer changes as focus moves between widgets.
• The probe is cheap — no document mutation, no JavaScript fire.

FormRedo, FormCanUndo, FormUndo