[xfa] Propagate the xfa change data for text to JS and back.

This CL adds the necessary plumbing to propagate the change information
for a text widget from FWL out to JS and handle the returned value as
necessary.

Bug: pdfium:1066
Change-Id: I78fd81761b90294f1836e9f09dba12ed238963cc
Reviewed-on: https://pdfium-review.googlesource.com/33070
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 11 insertions, 5 deletions

diff --git a/xfa/fde/cfde_texteditengine.h b/xfa/fde/cfde_texteditengine.h
index 58f77edf31..868be8866a 100644
--- a/xfa/fde/cfde_texteditengine.h
+++ b/xfa/fde/cfde_texteditengine.h
@@ -61,21 +61,27 @@ class CFDE_TextEditEngine {
     virtual void Undo() const = 0;
   };
 
+  struct TextChange {
+    WideString text;
+    WideString previous_text;
+    size_t selection_start;
+    size_t selection_end;
+    bool cancelled;
+  };
+
   class Delegate {
    public:
     virtual ~Delegate() = default;
     virtual void NotifyTextFull() = 0;
     virtual void OnCaretChanged() = 0;
-    virtual void OnTextChanged(const WideString& prevText) = 0;
+    virtual void OnTextWillChange(TextChange* change) = 0;
+    virtual void OnTextChanged() = 0;
     virtual void OnSelChanged() = 0;
     virtual bool OnValidate(const WideString& wsText) = 0;
     virtual void SetScrollOffset(float fScrollOffset) = 0;
   };
 
-  enum class RecordOperation {
-    kInsertRecord,
-    kSkipRecord,
-  };
+  enum class RecordOperation { kInsertRecord, kSkipRecord, kSkipNotify };
 
   CFDE_TextEditEngine();
   ~CFDE_TextEditEngine();