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, 7 insertions, 0 deletions

diff --git a/fpdfsdk/pdfwindow/cpwl_combo_box.cpp b/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
index b69f98906e..2929aac90f 100644
--- a/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
+++ b/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
@@ -216,6 +216,13 @@ void CPWL_ComboBox::KillFocus() {
   CPWL_Wnd::KillFocus();
 }
 
+CFX_WideString CPWL_ComboBox::GetSelectedText() {
+  if (m_pEdit)
+    return m_pEdit->GetSelectedText();
+
+  return CFX_WideString();
+}
+
 CFX_WideString CPWL_ComboBox::GetText() const {
   if (m_pEdit) {
     return m_pEdit->GetText();