[SVG2] Add tabindex handling in svg.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 58 matching lines @@
 #include "core/dom/shadow/InsertionPoint.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/TextIterator.h"
 #include "core/editing/htmlediting.h"
 #include "core/editing/markup.h"
 #include "core/events/EventDispatcher.h"
 #include "core/events/FocusEvent.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/ClassList.h"
 #include "core/html/HTMLCollection.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLFormControlsCollection.h"
 #include "core/html/HTMLFrameElementBase.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/html/HTMLLabelElement.h"
@@ skipping 136 matching lines @@
 {
     if (hasRareData())
         elementRareData()->clearTabIndexExplicitly();
 }
 
 void Element::setTabIndexExplicitly(short tabIndex)
 {
     ensureElementRareData().setTabIndexExplicitly(tabIndex);
 }
 
+void Element::setTabIndex(int value)
+{
+    setIntegralAttribute(tabindexAttr, value);
+}
+
 short Element::tabIndex() const
 {
     return hasRareData() ? elementRareData()->tabIndex() : 0;
 }
 
 bool Element::rendererIsFocusable() const
 {
     // Elements in canvas fallback content are not rendered, but they are allowed to be
     // focusable as long as their canvas is displayed and visible.
     if (isInCanvasSubtree()) {
@@ skipping 1674 matching lines @@
     if (index == kNotFound) {
         exceptionState.throwDOMException(NotFoundError, "The attribute was not found on this element.");
         return nullptr;
     }
 
     RefPtr<Attr> guard(attr);
     detachAttrNodeAtIndex(attr, index);
     return guard.release();
 }
 
+void Element::parseAttribute(const QualifiedName& name, const AtomicString& value)
+{
+    if (name == tabindexAttr) {
+        int tabindex = 0;
+        if (value.isEmpty()) {
+            clearTabIndexExplicitlyIfNeeded();
+            if (treeScope().adjustedFocusedElement() == this) {
+                // We might want to call blur(), but it's dangerous to dispatch
+                // events here.
+                document().setNeedsFocusedElementCheck();
+            }
+        } else if (parseHTMLInteger(value, tabindex)) {
+            // Clamp tabindex to the range of 'short' to match Firefox's behavior.
+            setTabIndexExplicitly(max(static_cast<int>(std::numeric_limits<short>::min()), std::min(tabindex, static_cast<int>(std::numeric_limits<short>::max()))));
+        }
+    }
+}
+
 bool Element::parseAttributeName(QualifiedName& out, const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState& exceptionState)
 {
     AtomicString prefix, localName;
     if (!Document::parseQualifiedName(qualifiedName, prefix, localName, exceptionState))
         return false;
     ASSERT(!exceptionState.hadException());
 
     QualifiedName qName(prefix, localName, namespaceURI);
 
     if (!Document::hasValidNamespaceForAttributes(qName)) {
@@ skipping 174 matching lines @@
     cancelFocusAppearanceUpdate();
     if (treeScope().adjustedFocusedElement() == this) {
         Document& doc = document();
         if (doc.page())
             doc.page()->focusController().setFocusedElement(0, doc.frame());
         else
             doc.setFocusedElement(nullptr);
     }
 }
 
+bool Element::supportsFocus() const
+{
+    // FIXME: supportsFocus() can be called when layout is not up to date.
+    // Logic that deals with the renderer should be moved to rendererIsFocusable().
+    // But supportsFocus must return true when the element is editable, or else
+    // it won't be focusable. Furthermore, supportsFocus cannot just return true
+    // always or else tabIndex() will change for all HTML elements.
+    return hasElementFlag(TabIndexWasSetExplicitly) || (rendererIsEditable() && parentNode() && !parentNode()->rendererIsEditable())
+        || supportsSpatialNavigationFocus();
+}
+
+bool Element::supportsSpatialNavigationFocus() const
+{
+    // This function checks whether the element satisfies the extended criteria
+    // for the element to be focusable, introduced by spatial navigation feature,
+    // i.e. checks if click or keyboard event handler is specified.
+    // This is the way to make it possible to navigate to (focus) elements
+    // which web designer meant for being active (made them respond to click events).
+
+    if (!document().settings() || !document().settings()->spatialNavigationEnabled())
+        return false;
+    return hasEventListeners(EventTypeNames::click)
+        || hasEventListeners(EventTypeNames::keydown)
+        || hasEventListeners(EventTypeNames::keypress)
+        || hasEventListeners(EventTypeNames::keyup);
+}
+
 bool Element::isFocusable() const
 {
     return inDocument() && supportsFocus() && !isInert() && rendererIsFocusable();
 }
 
 bool Element::isKeyboardFocusable() const
 {
     return isFocusable() && tabIndex() >= 0;
 }
 
@@ skipping 1131 matching lines @@
         || isHTMLObjectElement(*this)
         || isHTMLAppletElement(*this)
         || isHTMLCanvasElement(*this))
         return false;
     if (FullscreenElementStack::isActiveFullScreenElement(this))
         return false;
     return true;
 }
 
 } // namespace WebCore