Adding support for Smart GO NEXT feature in Android Chrome

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 98 matching lines @@
 #include "platform/graphics/Color.h"
 #include "platform/graphics/FirstPaintInvalidationTracking.h"
 #include "platform/graphics/Image.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "platform/weborigin/SchemeRegistry.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCompositeAndReadbackAsyncCallback.h"
 #include "public/platform/WebDragData.h"
 #include "public/platform/WebFloatPoint.h"
+#include "public/platform/WebFocusType.h"
 #include "public/platform/WebGestureCurve.h"
 #include "public/platform/WebImage.h"
 #include "public/platform/WebLayerTreeView.h"
 #include "public/platform/WebURLRequest.h"
 #include "public/platform/WebVector.h"
 #include "public/web/WebAXObject.h"
 #include "public/web/WebActiveWheelFlingParameters.h"
 #include "public/web/WebAutofillClient.h"
 #include "public/web/WebBeginFrameArgs.h"
 #include "public/web/WebFrameClient.h"
@@ skipping 2379 matching lines @@
                 flags |= WebTextInputFlagAutocapitalizeCharacters;
             else if (autocapitalize == words)
                 flags |= WebTextInputFlagAutocapitalizeWords;
             else if (autocapitalize == sentences)
                 flags |= WebTextInputFlagAutocapitalizeSentences;
             else
                 ASSERT_NOT_REACHED();
         }
     }
 
+    if (wantEnterEvents(element))
+        flags |= WebTextInputFlagWantEnterEvents;
+
+    if (haveNextInput(element, WebFocusTypeForward))
+        flags |= WebTextInputFlagHaveNextInput;
+
+    if (haveNextInput(element, WebFocusTypeBackward))
+        flags |= WebTextInputFlagHavePreviousInput;
+
     return flags;
 }
 
+Element* WebViewImpl::haveNextInput(Element* element, WebFocusType focusType)
+{
+    if (!element->isFormControlElement())
+        return nullptr;
+
+    HTMLFormControlElement* formControlElement = toHTMLFormControlElement(element);
+    Node* parentFormNode = reinterpret_cast<Node*>(formControlElement->formOwner());
+    if (!parentFormNode)
+        return nullptr;
+
+    Node* nextNode = element;
+    while ((nextNode = page()->focusController().findFocusableNode(focusType, *nextNode))) {
+        if (nextNode->isDescendantOf(parentFormNode)) {
+            LayoutObject* layout = nextNode->layoutObject();
+            if (nextNode->isContentEditable() || (layout && layout->isTextControl())) {
+                // TODO(AKV) Extend it for Select element, Radio button and Check boxes
+                if (nextNode->isElementNode())
+                    return toElement(nextNode);
+            }
+        } else {
+            // TODO(AKV) Do we need to quit as and when we found a node which is not child of this form. (Need to discuss with Kochi)

[kochi, 2015/04/14 05:08:30]

Yeah, I think once you go out of the current form, you should break here.
So I'd write the code as

while (...) {
    if (!nextNode->isDescendantOf(parentFormNode))
        break;  // or return nullptr; ?
    LayoutObject* layout = nextNode->layoutObject();
    ...
}

[AKV, 2015/04/14 06:01:47]

Thanks. I did same :)

+        }
+    }
+    return nullptr;
+}
+
+bool WebViewImpl::wantEnterEvents(Element* element)
+{
+    if (!element->isFormControlElement())
+        return false;
+
+    return (element->hasEventListeners(EventTypeNames::keydown) || element->hasEventListeners(EventTypeNames::keypress) || element->hasEventListeners(EventTypeNames::keystatuseschange) || element->hasEventListeners(EventTypeNames::keyup));
+}
+
+void WebViewImpl::advanceFocusToNextInputField(WebFocusType focusType)
+{
+    Element* element = focusedElement();
+    if (!element)
+        return;
+
+    Element* nextElement = haveNextInput(element, focusType);
+    if (!nextElement)
+        return;
+
+    nextElement->scrollIntoViewIfNeeded(true /*centerIfNeeded*/);
+    nextElement->dispatchSimulatedClick(0, SendMouseUpDownEvents);
+    nextElement->focus(false, focusType);
+}
+
 WebString WebViewImpl::inputModeOfFocusedElement()
 {
     if (!RuntimeEnabledFeatures::inputModeAttributeEnabled())
         return WebString();
 
     Element* element = focusedElement();
     if (!element)
         return WebString();
 
     if (isHTMLInputElement(*element)) {
@@ skipping 1980 matching lines @@
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 void WebViewImpl::forceNextWebGLContextCreationToFail()
 {
     WebGLRenderingContext::forceNextWebGLContextCreationToFail();
 }
 
 } // namespace blink