Add FORM_GetSelectedText() function.

This function copies the selected text from a form text field or
form combobox text field into the buffer parameter and returns the
length of the selected text string. When buffer is a nullptr or
buflen is less than the length of the selected text, this function
does not modify the buffer and only returns the selected text length.

BUG=chromium:59266

Change-Id: Ie77de38e45bbe6f9ea033826c961435304eedfc7
Reviewed-on: https://pdfium-review.googlesource.com/6413
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fpdfsdk/formfiller/cffl_interactiveformfiller.h b/fpdfsdk/formfiller/cffl_interactiveformfiller.h
index f72dfbcc61..b7724a32e3 100644
--- a/fpdfsdk/formfiller/cffl_interactiveformfiller.h
+++ b/fpdfsdk/formfiller/cffl_interactiveformfiller.h
@@ -82,6 +82,8 @@ class CFFL_InteractiveFormFiller : public IPWL_Filler_Notify {
   CFFL_FormFiller* GetFormFiller(CPDFSDK_Annot* pAnnot, bool bRegister);
   void RemoveFormFiller(CPDFSDK_Annot* pAnnot);
 
+  CFX_WideString GetSelectedText(CPDFSDK_Annot* pAnnot);
+
   static bool IsVisible(CPDFSDK_Widget* pWidget);
   static bool IsReadOnly(CPDFSDK_Widget* pWidget);
   static bool IsFillingAllowed(CPDFSDK_Widget* pWidget);