AllowUserTextSelection property

Denna API-post behåller identifierare, signaturer, kodblock och PDF-termer i ursprunglig form.

Gates user-input-driven text selection in the viewer.

When True (the default), the viewer reacts to selection-related user input:

• Left-click on a text character starts a drag-select; click on whitespace falls through to the existing pan path.
• Double-click selects the word under the cursor; triple-click selects the line.
• Hovering over a character switches Cursor to crIBeam.
• Ctrl+A selects the current page (both pages in spread display modes).
• Ctrl+C copies the selection to the Windows clipboard as CF_UNICODETEXT.
• Shift+Left / Right extends the selection one character; Shift+Home / End extends to the visual line edge.
• Dragging the pointer into a 20-pixel viewer edge dead zone auto-scrolls the page while the drag is active.

When False, all of the above is silently disabled and the viewer behaves like v1.16.x — pan-only, link-click only, form-fill only. Kiosk hosts, preview panes, and read-only contexts can pin this flag to False at design time.

This flag only gates user input. The code-level public API (SelectAll, ClearSelection, CopySelectionToClipboard) continues to work regardless of the flag value, so a host application can disable user-driven selection while still building "Select All / Copy" toolbar buttons that drive the same API.

• Reserved in v1.17.0 (property published, no behaviour wired). Active since v1.36.0 — existing applications upgrade with no behavioural change because the default is still True and the form-fill subsystem keeps priority.
• While a form field is being edited, all selection keyboard shortcuts defer so the field receives Ctrl+C / Ctrl+A / Shift+arrows for its own selection.
• Set design-time defaults in the Object Inspector or assign at runtime before Active := True; selection clears on SetPdf, SetPageNumber, SetActive(False), and DisplayMode changes.

SelectionColor, OnSelectionChange, HasSelection, SelectAll, ClearSelection, SelectedText, CopySelectionToClipboard