[xfa] Allow accessing the event changed parameter from JS.

This CL updates the CFXJSE_Engine code to access the defined properties
of a class if we fail to find the property in any other way. This fixes
up an issue where we were unable to read the 'change' property of the
CJX_EventPseudoModel because we could not find the 'change' property.

Bug: 1066
Change-Id: I4ad205bc527beeca1c3e24a36cdde0c21287d9fb
Reviewed-on: https://pdfium-review.googlesource.com/32930
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>

2 files changed, 45 insertions, 0 deletions

diff --git a/fxjs/cfxjse_engine.cpp b/fxjs/cfxjse_engine.cpp
index f0c522f018..ff2bcc4618 100644
--- a/fxjs/cfxjse_engine.cpp
+++ b/fxjs/cfxjse_engine.cpp
@@ -325,6 +325,19 @@ void CFXJSE_Engine::NormalPropertyGetter(CFXJSE_Value* pOriginalValue,
   if (pScriptObject) {
     bRet = lpScriptContext->QueryVariableValue(ToNode(pScriptObject),
                                                szPropName, pReturnValue, true);
+
+    if (!bRet) {
+      WideString wsPropName = WideString::FromUTF8(szPropName);
+      const XFA_SCRIPTATTRIBUTEINFO* lpAttributeInfo =
+          XFA_GetScriptAttributeByName(pObject->GetElementType(),
+                                       wsPropName.AsStringView());
+      if (lpAttributeInfo) {
+        CJX_Object* jsObject = pObject->JSObject();
+        (jsObject->*(lpAttributeInfo->callback))(pReturnValue, false,
+                                                 lpAttributeInfo->attribute);
+        return;
+      }
+    }
   }
   if (!bRet)
     pReturnValue->SetUndefined();
@@ -510,6 +523,7 @@ bool CFXJSE_Engine::QueryVariableValue(CXFA_Node* pScriptNode,
     pObject->SetObjectOwnProperty(szPropName, pValue);
     return true;
   }
+
   if (pObject->HasObjectOwnProperty(szPropName, false)) {
     pObject->GetObjectProperty(szPropName, hVariableValue.get());
     if (hVariableValue->IsFunction())
diff --git a/fxjs/cfxjse_formcalc_context_embeddertest.cpp b/fxjs/cfxjse_formcalc_context_embeddertest.cpp
index a7efc14d20..a32f988d06 100644
--- a/fxjs/cfxjse_formcalc_context_embeddertest.cpp
+++ b/fxjs/cfxjse_formcalc_context_embeddertest.cpp
@@ -2,8 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "fxjs/cfxjse_engine.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/xfa_js_embedder_test.h"
+#include "xfa/fxfa/cxfa_eventparam.h"
 
 class CFXJSE_FormCalcContextEmbedderTest : public XFAJSEmbedderTest {};
 
@@ -1455,3 +1457,32 @@ TEST_F(CFXJSE_FormCalcContextEmbedderTest, MethodCall) {
   EXPECT_TRUE(value->IsString());
   EXPECT_STREQ("12.7mm", value->ToString().c_str());
 }
+
+TEST_F(CFXJSE_FormCalcContextEmbedderTest, GetXFAEventChange) {
+  ASSERT_TRUE(OpenDocument("simple_xfa.pdf"));
+
+  CXFA_EventParam params;
+  params.m_wsChange = L"changed";
+
+  CFXJSE_Engine* context = GetScriptContext();
+  context->SetEventParam(params);
+
+  const char test[] = {"xfa.event.change"};
+  EXPECT_TRUE(Execute(test));
+
+  CFXJSE_Value* value = GetValue();
+  EXPECT_TRUE(value->IsString());
+  EXPECT_STREQ("changed", value->ToString().c_str());
+}
+
+TEST_F(CFXJSE_FormCalcContextEmbedderTest, SetXFAEventChange) {
+  ASSERT_TRUE(OpenDocument("simple_xfa.pdf"));
+
+  CXFA_EventParam params;
+  CFXJSE_Engine* context = GetScriptContext();
+  context->SetEventParam(params);
+
+  const char test[] = {"xfa.event.change = \"changed\""};
+  EXPECT_TRUE(Execute(test));
+  EXPECT_EQ(L"changed", context->GetEventParam()->m_wsChange);
+}