[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, 21 insertions, 8 deletions

diff --git a/xfa/fwl/cfwl_edit.cpp b/xfa/fwl/cfwl_edit.cpp
index 7bdb818192..7c4f0e1607 100644
--- a/xfa/fwl/cfwl_edit.cpp
+++ b/xfa/fwl/cfwl_edit.cpp
@@ -19,7 +19,7 @@
 #include "xfa/fwl/cfwl_app.h"
 #include "xfa/fwl/cfwl_caret.h"
 #include "xfa/fwl/cfwl_event.h"
-#include "xfa/fwl/cfwl_eventtextchanged.h"
+#include "xfa/fwl/cfwl_eventtextwillchange.h"
 #include "xfa/fwl/cfwl_eventvalidate.h"
 #include "xfa/fwl/cfwl_messagekey.h"
 #include "xfa/fwl/cfwl_messagemouse.h"
@@ -171,9 +171,10 @@ void CFWL_Edit::SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) {
   m_pProperties->m_pThemeProvider = pThemeProvider;
 }
 
-void CFWL_Edit::SetText(const WideString& wsText) {
+void CFWL_Edit::SetText(const WideString& wsText,
+                        CFDE_TextEditEngine::RecordOperation op) {
   m_EdtEngine.Clear();
-  m_EdtEngine.Insert(0, wsText);
+  m_EdtEngine.Insert(0, wsText, op);
 }
 
 int32_t CFWL_Edit::GetTextLength() const {
@@ -297,14 +298,26 @@ void CFWL_Edit::OnCaretChanged() {
   }
 }
 
-void CFWL_Edit::OnTextChanged(const WideString& prevText) {
-  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_VAlignMask)
-    UpdateVAlignment();
+void CFWL_Edit::OnTextWillChange(CFDE_TextEditEngine::TextChange* change) {
+  CFWL_EventTextWillChange event(this);
+  event.previous_text = change->previous_text;
+  event.change_text = change->text;
+  event.selection_start = change->selection_start;
+  event.selection_end = change->selection_end;
+  event.cancelled = false;
 
-  CFWL_EventTextChanged event(this);
-  event.wsPrevText = prevText;
   DispatchEvent(&event);
 
+  change->text = event.change_text;
+  change->selection_start = event.selection_start;
+  change->selection_end = event.selection_end;
+  change->cancelled = event.cancelled;
+}
+
+void CFWL_Edit::OnTextChanged() {
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_VAlignMask)
+    UpdateVAlignment();
+
   LayoutScrollBar();
   RepaintRect(GetClientRect());
 }