Rename PendingSelection to LayoutSelection

third_party/WebKit/Source/core/editing/PendingSelection.cpp

-/*
- * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
- * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
- * reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#include "core/editing/PendingSelection.h"
-
-#include "core/dom/Document.h"
-#include "core/editing/EditingUtilities.h"
-#include "core/editing/FrameSelection.h"
-#include "core/editing/VisiblePosition.h"
-#include "core/editing/VisibleUnits.h"
-#include "core/html/TextControlElement.h"
-#include "core/layout/LayoutView.h"
-
-namespace blink {
-
-PendingSelection::PendingSelection(FrameSelection& frameSelection)
-    : m_frameSelection(&frameSelection), m_hasPendingSelection(false) {}
-
-const VisibleSelection& PendingSelection::visibleSelection() const {
-  return m_frameSelection->computeVisibleSelectionInDOMTree();
-}
-
-static bool isSelectionInDocument(
-    const VisibleSelectionInFlatTree& visibleSelection,
-    const Document& document) {
-  const PositionInFlatTree& start = visibleSelection.start();
-  if (start.isNotNull() &&
-      (!start.isConnected() || start.document() != document))
-    return false;
-  const PositionInFlatTree& end = visibleSelection.end();
-  if (end.isNotNull() && (!end.isConnected() || end.document() != document))
-    return false;
-  const PositionInFlatTree extent = visibleSelection.extent();
-  if (extent.isNotNull() &&
-      (!extent.isConnected() || extent.document() != document))
-    return false;
-  return true;
-}
-
-SelectionInFlatTree PendingSelection::calcVisibleSelection(
-    const VisibleSelectionInFlatTree& originalSelection) const {
-  const PositionInFlatTree& start = originalSelection.start();
-  const PositionInFlatTree& end = originalSelection.end();
-  SelectionType selectionType = originalSelection.getSelectionType();
-  const TextAffinity affinity = originalSelection.affinity();
-
-  bool paintBlockCursor =
-      m_frameSelection->shouldShowBlockCursor() &&
-      selectionType == SelectionType::CaretSelection &&
-      !isLogicalEndOfLine(createVisiblePosition(end, affinity));
-  if (enclosingTextControl(start.computeContainerNode())) {
-    // TODO(yosin) We should use |PositionMoveType::CodePoint| to avoid
-    // ending paint at middle of character.
-    PositionInFlatTree endPosition =
-        paintBlockCursor ? nextPositionOf(originalSelection.extent(),
-                                          PositionMoveType::CodeUnit)
-                         : end;
-    return SelectionInFlatTree::Builder()
-        .setBaseAndExtent(start, endPosition)
-        .build();
-  }
-
-  const VisiblePositionInFlatTree& visibleStart = createVisiblePosition(
-      start, selectionType == SelectionType::RangeSelection
-                 ? TextAffinity::Downstream
-                 : affinity);
-  if (visibleStart.isNull())
-    return SelectionInFlatTree();
-  if (paintBlockCursor) {
-    const VisiblePositionInFlatTree visibleExtent = nextPositionOf(
-        createVisiblePosition(end, affinity), CanSkipOverEditingBoundary);
-    if (visibleExtent.isNull())
-      return SelectionInFlatTree();
-    SelectionInFlatTree::Builder builder;
-    builder.collapse(visibleStart.toPositionWithAffinity());
-    builder.extend(visibleExtent.deepEquivalent());
-    return builder.build();
-  }
-  const VisiblePositionInFlatTree visibleEnd =
-      createVisiblePosition(end, selectionType == SelectionType::RangeSelection
-                                     ? TextAffinity::Upstream
-                                     : affinity);
-  if (visibleEnd.isNull())
-    return SelectionInFlatTree();
-  SelectionInFlatTree::Builder builder;
-  builder.collapse(visibleStart.toPositionWithAffinity());
-  builder.extend(visibleEnd.deepEquivalent());
-  return builder.build();
-}
-
-void PendingSelection::commit(LayoutView& layoutView) {
-  if (!hasPendingSelection())
-    return;
-  DCHECK(!layoutView.needsLayout());
-  m_hasPendingSelection = false;
-
-  const VisibleSelectionInFlatTree& originalSelection =
-      m_frameSelection->computeVisibleSelectionInFlatTree();
-
-  // Skip if pending VisibilePositions became invalid before we reach here.
-  if (!isSelectionInDocument(originalSelection, layoutView.document()))
-    return;
-
-  // Construct a new VisibleSolution, since visibleSelection() is not
-  // necessarily valid, and the following steps assume a valid selection. See
-  // <https://bugs.webkit.org/show_bug.cgi?id=69563> and
-  // <rdar://problem/10232866>.
-  const SelectionInFlatTree selection = calcVisibleSelection(originalSelection);
-  const VisibleSelectionInFlatTree& visibleSelection =
-      createVisibleSelection(selection);
-
-  if (!visibleSelection.isRange() || !selectionHasFocus(selection)) {
-    layoutView.clearSelection();
-    return;
-  }
-
-  // Use the rightmost candidate for the start of the selection, and the
-  // leftmost candidate for the end of the selection. Example: foo <a>bar</a>.
-  // Imagine that a line wrap occurs after 'foo', and that 'bar' is selected.
-  // If we pass [foo, 3] as the start of the selection, the selection painting
-  // code will think that content on the line containing 'foo' is selected
-  // and will fill the gap before 'bar'.
-  PositionInFlatTree startPos = visibleSelection.start();
-  PositionInFlatTree candidate = mostForwardCaretPosition(startPos);
-  if (isVisuallyEquivalentCandidate(candidate))
-    startPos = candidate;
-  PositionInFlatTree endPos = visibleSelection.end();
-  candidate = mostBackwardCaretPosition(endPos);
-  if (isVisuallyEquivalentCandidate(candidate))
-    endPos = candidate;
-
-  // We can get into a state where the selection endpoints map to the same
-  // |VisiblePosition| when a selection is deleted because we don't yet notify
-  // the |FrameSelection| of text removal.
-  if (startPos.isNull() || endPos.isNull() ||
-      visibleSelection.visibleStart().deepEquivalent() ==
-          visibleSelection.visibleEnd().deepEquivalent())
-    return;
-  LayoutObject* startLayoutObject = startPos.anchorNode()->layoutObject();
-  LayoutObject* endLayoutObject = endPos.anchorNode()->layoutObject();
-  if (!startLayoutObject || !endLayoutObject)
-    return;
-  DCHECK(layoutView == startLayoutObject->view());
-  DCHECK(layoutView == endLayoutObject->view());
-  layoutView.setSelection(startLayoutObject, startPos.computeEditingOffset(),
-                          endLayoutObject, endPos.computeEditingOffset());
-}
-
-DEFINE_TRACE(PendingSelection) {
-  visitor->trace(m_frameSelection);
-}
-
-}  // namespace blink