/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "CaretAssociationHint.h"
#include "mozilla/RangeBoundary.h" // for RangeBoundaryBase
#include "mozilla/SelectionMovementUtils.h" // for CaretFrameData
#include "mozilla/intl/BidiEmbeddingLevel.h" // for BidiEmbeddingLevel
#include "nsCaret.h" // for nsCaret
#include "nsIContent.h" // for nsIContent
#include "nsIFrame.h" // for nsIFrame
#include "nsTextFrame.h" // for nsTextFrame
namespace mozilla {
template CaretAssociationHint ComputeCaretAssociationHint(
CaretAssociationHint aDefault, intl::BidiEmbeddingLevel aBidiLevel,
const RangeBoundary& aCaretPoint);
template CaretAssociationHint ComputeCaretAssociationHint(
CaretAssociationHint aDefault, intl::BidiEmbeddingLevel aBidiLevel,
const RawRangeBoundary& aCaretPoint);
template <
typename PT,
typename CT>
CaretAssociationHint ComputeCaretAssociationHint(
CaretAssociationHint aDefault, intl::BidiEmbeddingLevel aBidiLevel,
const RangeBoundaryBase<PT, CT>& aCaretPoint) {
MOZ_ASSERT(aCaretPoint.IsSetAndValid());
if (aDefault != CaretAssociationHint::Before ||
!aCaretPoint.Container()->IsContent()) {
return aDefault;
}
const nsCaret::CaretPosition pos{
aCaretPoint.Container(),
static_cast<int32_t>(*aCaretPoint.Offset(
RangeBoundaryBase<PT, CT>::OffsetFilter::kValidOffsets)),
aDefault, aBidiLevel};
CaretFrameData frameData = nsCaret::GetFrameAndOffset(pos);
nsTextFrame* f = do_QueryFrame(frameData.mFrame);
if (f && f->IsAtEndOfLine() && f->HasSignificantTerminalNewline()) {
// RangeBoundaryBase<PT, CT>::Offset() causes computing offset if it's not
// been done yet. However, it's called only when the container is a text
// node. In such case, offset has always been set since it cannot have
// any children. So, this doesn't cause computing offset with expensive
// method, nsINode::ComputeIndexOf().
const bool caretPointIsAtEndOfFrame =
aCaretPoint.Container() == f->GetContent() &&
f->GetContentEnd() ==
static_cast<int32_t>(*aCaretPoint.Offset(
RangeBoundaryBase<PT, CT>::OffsetFilter::kValidOffsets));
const bool caretPointIsImmediatelyAfterFrameContent =
aCaretPoint.Container() == f->GetContent()->GetParentNode() &&
f->GetContent() == aCaretPoint.GetPreviousSiblingOfChildAtOffset();
if (caretPointIsAtEndOfFrame || caretPointIsImmediatelyAfterFrameContent) {
return CaretAssociationHint::After;
}
}
return frameData.mFrame ? frameData.mHint : aDefault;
}
}
// namespace mozilla
