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

/*
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 * reserved.
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 * Redistribution and use in source and binary forms, with or without
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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "core/editing/LocalCaretRect.h"

#include "core/editing/EditingUtilities.h"
#include "core/editing/InlineBoxPosition.h"
#include "core/editing/PositionWithAffinity.h"
#include "core/layout/api/LineLayoutAPIShim.h"
#include "core/layout/line/RootInlineBox.h"

namespace blink {

namespace {

LocalCaretRect ComputeLocalCaretRect(const LayoutObject* layout_object,
                                     const InlineBoxPosition box_position) {
  return LocalCaretRect(
      layout_object, layout_object->LocalCaretRect(box_position.inline_box,
                                                   box_position.offset_in_box));
}

template <typename Strategy>
LocalCaretRect LocalCaretRectOfPositionTemplate(
    const PositionWithAffinityTemplate<Strategy>& position) {
  if (position.IsNull())
    return LocalCaretRect();
  Node* const node = position.AnchorNode();
  LayoutObject* const layout_object = node->GetLayoutObject();
  if (!layout_object)
    return LocalCaretRect();

  const PositionWithAffinityTemplate<Strategy>& adjusted =
      ComputeInlineAdjustedPosition(position);

  if (adjusted.IsNotNull()) {
    // TODO(xiaochengh): Plug in NG implementation here.

    // TODO(editing-dev): This DCHECK is for ensuring the correctness of
    // breaking |ComputeInlineBoxPosition| into |ComputeInlineAdjustedPosition|
    // and |ComputeInlineBoxPositionForInlineAdjustedPosition|. If there is any
    // DCHECK hit, we should pass primary direction to the latter function.
    // TODO(crbug.com/793098): Fix it so that we don't need to bother about
    // primary direction.
    DCHECK_EQ(PrimaryDirectionOf(*position.AnchorNode()),
              PrimaryDirectionOf(*adjusted.AnchorNode()));
    const InlineBoxPosition& box_position =
        ComputeInlineBoxPositionForInlineAdjustedPosition(adjusted);

    if (box_position.inline_box) {
      return ComputeLocalCaretRect(
          LineLayoutAPIShim::LayoutObjectFrom(
              box_position.inline_box->GetLineLayoutItem()),
          box_position);
    }
  }

  // DeleteSelectionCommandTest.deleteListFromTable goes here.
  return LocalCaretRect(
      layout_object,
      layout_object->LocalCaretRect(
          nullptr, position.GetPosition().ComputeEditingOffset()));
}

// This function was added because the caret rect that is calculated by
// using the line top value instead of the selection top.
template <typename Strategy>
LocalCaretRect LocalSelectionRectOfPositionTemplate(
    const PositionWithAffinityTemplate<Strategy>& position) {
  if (position.IsNull())
    return LocalCaretRect();
  Node* const node = position.AnchorNode();
  if (!node->GetLayoutObject())
    return LocalCaretRect();

  const PositionWithAffinityTemplate<Strategy>& adjusted =
      ComputeInlineAdjustedPosition(position);
  if (adjusted.IsNull())
    return LocalCaretRect();

  // TODO(xiaochengh): Plug in NG implementation here.

  // TODO(editing-dev): This DCHECK is for ensuring the correctness of
  // breaking |ComputeInlineBoxPosition| into |ComputeInlineAdjustedPosition|
  // and |ComputeInlineBoxPositionForInlineAdjustedPosition|. If there is any
  // DCHECK hit, we should pass primary direction to the latter function.
  // TODO(crbug.com/793098): Fix it so that we don't need to bother about
  // primary direction.
  DCHECK_EQ(PrimaryDirectionOf(*position.AnchorNode()),
            PrimaryDirectionOf(*adjusted.AnchorNode()));
  const InlineBoxPosition& box_position =
      ComputeInlineBoxPositionForInlineAdjustedPosition(adjusted);

  if (!box_position.inline_box)
    return LocalCaretRect();

  LayoutObject* const layout_object = LineLayoutAPIShim::LayoutObjectFrom(
      box_position.inline_box->GetLineLayoutItem());

  const LayoutRect& rect = layout_object->LocalCaretRect(
      box_position.inline_box, box_position.offset_in_box);

  if (rect.IsEmpty())
    return LocalCaretRect();

  const InlineBox* const box = box_position.inline_box;
  if (layout_object->Style()->IsHorizontalWritingMode()) {
    return LocalCaretRect(
        layout_object,
        LayoutRect(LayoutPoint(rect.X(), box->Root().SelectionTop()),
                   LayoutSize(rect.Width(), box->Root().SelectionHeight())));
  }

  return LocalCaretRect(
      layout_object,
      LayoutRect(LayoutPoint(box->Root().SelectionTop(), rect.Y()),
                 LayoutSize(box->Root().SelectionHeight(), rect.Height())));
}

}  // namespace

LocalCaretRect LocalCaretRectOfPosition(const PositionWithAffinity& position) {
  return LocalCaretRectOfPositionTemplate<EditingStrategy>(position);
}

LocalCaretRect LocalCaretRectOfPosition(
    const PositionInFlatTreeWithAffinity& position) {
  return LocalCaretRectOfPositionTemplate<EditingInFlatTreeStrategy>(position);
}

LocalCaretRect LocalSelectionRectOfPosition(
    const PositionWithAffinity& position) {
  return LocalSelectionRectOfPositionTemplate<EditingStrategy>(position);
}

}  // namespace blink