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Adds an AcroForm push button widget to the current page.
Delphi 語法：
procedure AddPushButton(const FieldName, Caption: AnsiString; Rectangle: TRect; Flags: THPDFFormFieldFlags = []);
說明
此方法會建立帶有 Pushbutton flag 的 /Btn field，並透過 widget appearance characteristics 寫入 caption。當按鈕應提交表單、重設表單、執行 JavaScript、開啟 URI、觸發 named viewer command，或隱藏另一個 field 時，請使用 AddPushButtonWithAction
THPDFButtonAction values
baNone — no /A action
baSubmitURL — /S /SubmitForm with /FS /URL filespec (PDF 1.2 §12.7.5.2). Param is the destination URL.
baResetForm — /S /ResetForm resets every form field (PDF 1.2 §12.7.5.3).
baJavaScript — /S /JavaScript /JS (Param) (PDF 1.3 §12.6.4.16).
baURI — /S /URI /URI (Param) (PDF 1.1 §12.6.4.7). Opens the URL in a browser.
baNamed (HotPDF v2.119.18) — /S /Named /N <Param> (PDF 1.1 §12.6.4.11). Param is the spec name token: NextPage / PrevPage / FirstPage / LastPage (the four standard navigation commands all PDF readers honor). Acrobat extensions like Print and SaveAs are also accepted by compatible viewers.
baHide (HotPDF v2.119.18) — /S /Hide /T (Param) /H true (PDF 1.2 §12.6.4.10). Param is the name of the form field or annotation to hide when the button is clicked.
Compliance
PDF/A（任何 level）會依 ISO 19005-1 §6.6.1 / ISO 19005-2 §6.5.1 / ISO 19005-3 §6.5.1 拒絕 baJavaScript 與 baResetForm。PDF/X（任何 level）也會拒絕 baSubmitURL。baNamed 與 baHide 在 PDF/A 與 PDF/X 下皆為 spec-allowed
請參閱： AcroForm 支援, LastAnnotation
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