Introduce enum class TextAffinity as replacement of enum EAffinity

Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 101 matching lines @@
 {
     VisibleSelection selection = frame().selection().selection();
     if (!event)
         return selection;
     // If the target is a text control, and the current selection is outside of its shadow tree,
     // then use the saved selection for that text control.
     HTMLTextFormControlElement* textFormControlOfSelectionStart = enclosingTextFormControl(selection.start());
     HTMLTextFormControlElement* textFromControlOfTarget = isHTMLTextFormControlElement(*event->target()->toNode()) ? toHTMLTextFormControlElement(event->target()->toNode()) : 0;
     if (textFromControlOfTarget && (selection.start().isNull() || textFromControlOfTarget != textFormControlOfSelectionStart)) {
         if (RefPtrWillBeRawPtr<Range> range = textFromControlOfTarget->selection())
-            return VisibleSelection(range.get(), DOWNSTREAM, selection.isDirectional());
+            return VisibleSelection(range.get(), TextAffinity::Downstream, selection.isDirectional());
     }
     return selection;
 }
 
 // Function considers Mac editing behavior a fallback when Page or Settings is not available.
 EditingBehavior Editor::behavior() const
 {
     if (!frame().settings())
         return EditingBehavior(EditingMacBehavior);
 
@@ skipping 893 matching lines @@
     VisiblePosition next = isEndOfParagraph(caret) ? caret : caret.next();
     VisiblePosition previous = next.previous();
     if (next.deepEquivalent() == previous.deepEquivalent())
         return;
     previous = previous.previous();
     if (!inSameParagraph(next, previous))
         return;
     const EphemeralRange range = makeRange(previous, next);
     if (range.isNull())
         return;
-    VisibleSelection newSelection(range, DOWNSTREAM);
+    VisibleSelection newSelection(range);
 
     // Transpose the two characters.
     String text = plainText(range);
     if (text.length() != 2)
         return;
     String transposed = text.right(1) + text.left(1);
 
     // Select the two characters.
     if (!VisibleSelection::InDOMTree::equalSelections(newSelection, frame().selection().selection()))
         frame().selection().setSelection(newSelection);
@@ skipping 31 matching lines @@
     // starts a new kill ring sequence, but we want to do these things (matches AppKit).
     if (selectionDidNotChangeDOMPosition)
         client().respondToChangedSelection(m_frame, frame().selection().selectionType());
 }
 
 IntRect Editor::firstRectForRange(const EphemeralRange& range) const
 {
     LayoutUnit extraWidthToEndOfLine = 0;
     ASSERT(range.isNotNull());
 
-    IntRect startCaretRect = RenderedPosition(VisiblePosition(range.startPosition()).deepEquivalent(), DOWNSTREAM).absoluteRect(&extraWidthToEndOfLine);
+    IntRect startCaretRect = RenderedPosition(VisiblePosition(range.startPosition()).deepEquivalent(), TextAffinity::Downstream).absoluteRect(&extraWidthToEndOfLine);
     if (startCaretRect == LayoutRect())
         return IntRect();
 
-    IntRect endCaretRect = RenderedPosition(VisiblePosition(range.endPosition()).deepEquivalent(), UPSTREAM).absoluteRect();
+    IntRect endCaretRect = RenderedPosition(VisiblePosition(range.endPosition()).deepEquivalent(), TextAffinity::Upstream).absoluteRect();
     if (endCaretRect == LayoutRect())
         return IntRect();
 
     if (startCaretRect.y() == endCaretRect.y()) {
         // start and end are on the same line
         return IntRect(std::min(startCaretRect.x(), endCaretRect.x()),
             startCaretRect.y(),
             abs(endCaretRect.x() - startCaretRect.x()),
             std::max(startCaretRect.height(), endCaretRect.height()));
     }
@@ skipping 44 matching lines @@
 {
     VisibleSelection selection = frame().selection().selection();
 
     // TODO(yosin) We should make |findRangeOfString()| to return
     // |EphemeralRange| rather than|Range| object.
     RefPtrWillBeRawPtr<Range> resultRange = findRangeOfString(target, EphemeralRange(selection.start(), selection.end()), static_cast<FindOptions>(options | FindAPICall));
 
     if (!resultRange)
         return false;
 
-    frame().selection().setSelection(VisibleSelection(resultRange.get(), DOWNSTREAM));
+    frame().selection().setSelection(VisibleSelection(resultRange.get()));
     frame().selection().revealSelection();
     return true;
 }
 
 template <typename Strategy>
 static PassRefPtrWillBeRawPtr<Range> findStringAndScrollToVisibleAlgorithm(Editor& editor, const String& target, const EphemeralRangeTemplate<Strategy>& previousMatch, FindOptions options)
 {
     RefPtrWillBeRawPtr<Range> nextMatch = editor.findRangeOfString(target, previousMatch, options);
     if (!nextMatch)
         return nullptr;
@@ skipping 128 matching lines @@
 }
 
 DEFINE_TRACE(Editor)
 {
     visitor->trace(m_frame);
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_mark);
 }
 
 } // namespace blink