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chromium / chromium / src / 58a509a2ec205e6eed9a8c276511bec5d0a3ebc1 / . / third_party / blink / renderer / core / editing / layout_selection.cc
blob: a1e219fd9d2d1175f022d24e33203f6241107bae [file] [log] [blame]
/*
* 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 "third_party/blink/renderer/core/editing/layout_selection.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/node_computed_style.h"
#include "third_party/blink/renderer/core/editing/editing_utilities.h"
#include "third_party/blink/renderer/core/editing/ephemeral_range.h"
#include "third_party/blink/renderer/core/editing/frame_selection.h"
#include "third_party/blink/renderer/core/editing/selection_template.h"
#include "third_party/blink/renderer/core/editing/visible_position.h"
#include "third_party/blink/renderer/core/editing/visible_units.h"
#include "third_party/blink/renderer/core/html/forms/text_control_element.h"
#include "third_party/blink/renderer/core/layout/layout_text.h"
#include "third_party/blink/renderer/core/layout/layout_text_fragment.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_fragment_item.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_cursor.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_offset_mapping.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_physical_line_box_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_physical_text_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/ng_block_node.h"
#include "third_party/blink/renderer/core/paint/paint_layer.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_view.h"
namespace blink {
namespace {
// TODO(yoichio): Share condition between NGOffsetMapping::AcceptsPosition.
bool ShouldUseLayoutNGTextContent(const Node& node) {
LayoutObject* layout_object = node.GetLayoutObject();
DCHECK(layout_object);
if (layout_object->IsInline())
return layout_object->ContainingNGBlockFlow();
if (auto* block_flow = DynamicTo<LayoutBlockFlow>(layout_object))
return NGBlockNode::CanUseNewLayout(*block_flow);
return false;
}
} // namespace
// The current selection to be painted is represented as 2 pairs of
// (Node, offset).
// Each offset represents text offsets on selection edge if it is text.
// For example, suppose we select "f^oo<br><img>|",
// |start_offset_| is 1 and |end_offset_| is nullopt.
// If on NG, offset is on text content offset rather than each text node.
class SelectionPaintRange : public GarbageCollected<SelectionPaintRange> {
public:
SelectionPaintRange() = default;
SelectionPaintRange(const Node& passed_start_node,
base::Optional<unsigned> passed_start_offset,
const Node& passed_end_node,
base::Optional<unsigned> passed_end_offset)
: start_node(passed_start_node),
start_offset(passed_start_offset),
end_node(passed_end_node),
end_offset(passed_end_offset) {}
void Trace(Visitor* visitor) {
visitor->Trace(start_node);
visitor->Trace(end_node);
}
bool IsNull() const { return !start_node; }
void AssertSanity() const {
#if DCHECK_IS_ON()
if (start_node) {
DCHECK(end_node);
DCHECK(start_node->GetLayoutObject()->GetSelectionState() ==
SelectionState::kStart ||
start_node->GetLayoutObject()->GetSelectionState() ==
SelectionState::kStartAndEnd);
DCHECK(end_node->GetLayoutObject()->GetSelectionState() ==
SelectionState::kEnd ||
end_node->GetLayoutObject()->GetSelectionState() ==
SelectionState::kStartAndEnd);
return;
}
DCHECK(!end_node);
DCHECK(!start_offset.has_value());
DCHECK(!end_offset.has_value());
#endif
}
Member<const Node> start_node;
base::Optional<unsigned> start_offset;
Member<const Node> end_node;
base::Optional<unsigned> end_offset;
};
LayoutSelection::LayoutSelection(FrameSelection& frame_selection)
: frame_selection_(&frame_selection),
has_pending_selection_(false),
paint_range_(MakeGarbageCollected<SelectionPaintRange>()) {}
enum class SelectionMode {
kNone,
kRange,
kBlockCursor,
};
void LayoutSelection::AssertIsValid() const {
const Document& document = frame_selection_->GetDocument();
DCHECK_GE(document.Lifecycle().GetState(), DocumentLifecycle::kLayoutClean);
DCHECK(!document.IsSlotAssignmentOrLegacyDistributionDirty());
DCHECK(!has_pending_selection_);
}
static SelectionMode ComputeSelectionMode(
const FrameSelection& frame_selection) {
const SelectionInDOMTree& selection_in_dom =
frame_selection.GetSelectionInDOMTree();
if (selection_in_dom.IsRange())
return SelectionMode::kRange;
DCHECK(selection_in_dom.IsCaret());
if (!frame_selection.ShouldShowBlockCursor())
return SelectionMode::kNone;
if (IsLogicalEndOfLine(CreateVisiblePosition(selection_in_dom.Base())))
return SelectionMode::kNone;
return SelectionMode::kBlockCursor;
}
static EphemeralRangeInFlatTree CalcSelectionInFlatTree(
const FrameSelection& frame_selection) {
const SelectionInDOMTree& selection_in_dom =
frame_selection.GetSelectionInDOMTree();
switch (ComputeSelectionMode(frame_selection)) {
case SelectionMode::kNone:
return {};
case SelectionMode::kRange: {
const PositionInFlatTree& base =
ToPositionInFlatTree(selection_in_dom.Base());
const PositionInFlatTree& extent =
ToPositionInFlatTree(selection_in_dom.Extent());
if (base.IsNull() || extent.IsNull() || base == extent ||
!base.IsValidFor(frame_selection.GetDocument()) ||
!extent.IsValidFor(frame_selection.GetDocument()))
return {};
return base <= extent ? EphemeralRangeInFlatTree(base, extent)
: EphemeralRangeInFlatTree(extent, base);
}
case SelectionMode::kBlockCursor: {
const PositionInFlatTree& base =
CreateVisiblePosition(ToPositionInFlatTree(selection_in_dom.Base()))
.DeepEquivalent();
if (base.IsNull())
return {};
const PositionInFlatTree end_position =
NextPositionOf(base, PositionMoveType::kGraphemeCluster);
if (end_position.IsNull())
return {};
return base <= end_position
? EphemeralRangeInFlatTree(base, end_position)
: EphemeralRangeInFlatTree(end_position, base);
}
}
NOTREACHED();
return {};
}
// OldSelectedNodes is current selected Nodes with
// current SelectionState which is kStart, kEnd, kStartAndEnd or kInside.
struct OldSelectedNodes {
STACK_ALLOCATED();
public:
OldSelectedNodes()
: paint_range(MakeGarbageCollected<SelectionPaintRange>()) {}
OldSelectedNodes(OldSelectedNodes&& other) {
paint_range = other.paint_range;
selected_map = std::move(other.selected_map);
}
SelectionPaintRange* paint_range;
HeapHashMap<Member<const Node>, SelectionState> selected_map;
private:
DISALLOW_COPY_AND_ASSIGN(OldSelectedNodes);
};
std::ostream& operator<<(std::ostream&, const OldSelectedNodes&);
// This struct represents a selection range in layout tree and each
// Node is SelectionState-marked.
struct NewPaintRangeAndSelectedNodes {
STACK_ALLOCATED();
public:
NewPaintRangeAndSelectedNodes()
: paint_range(MakeGarbageCollected<SelectionPaintRange>()) {}
NewPaintRangeAndSelectedNodes(
SelectionPaintRange* passed_paint_range,
HeapHashSet<Member<const Node>>&& passed_selected_objects)
: paint_range(passed_paint_range),
selected_objects(std::move(passed_selected_objects)) {}
NewPaintRangeAndSelectedNodes(NewPaintRangeAndSelectedNodes&& other) {
paint_range = other.paint_range;
selected_objects = std::move(other.selected_objects);
}
void AssertSanity() const {
#if DCHECK_IS_ON()
paint_range->AssertSanity();
if (paint_range->start_node) {
DCHECK(selected_objects.Contains(paint_range->start_node)) << this;
DCHECK(selected_objects.Contains(paint_range->end_node)) << this;
return;
}
DCHECK(selected_objects.IsEmpty()) << this;
#endif
}
SelectionPaintRange* paint_range;
HeapHashSet<Member<const Node>> selected_objects;
private:
DISALLOW_COPY_AND_ASSIGN(NewPaintRangeAndSelectedNodes);
};
std::ostream& operator<<(std::ostream&, const NewPaintRangeAndSelectedNodes&);
static void SetShouldInvalidateIfNeeded(LayoutObject* layout_object) {
if (layout_object->ShouldInvalidateSelection())
return;
layout_object->SetShouldInvalidateSelection();
// We should invalidate if ancestor of |layout_object| is LayoutSVGText
// because SVGRootInlineBoxPainter::Paint() paints selection for
// |layout_object| in/ LayoutSVGText and it is invoked when parent
// LayoutSVGText is invalidated.
// That is different from InlineTextBoxPainter::Paint() which paints
// LayoutText selection when LayoutText is invalidated.
if (!layout_object->IsSVG())
return;
for (LayoutObject* parent = layout_object->Parent(); parent;
parent = parent->Parent()) {
if (parent->IsSVGRoot())
return;
if (parent->IsSVGText()) {
if (!parent->ShouldInvalidateSelection())
parent->SetShouldInvalidateSelection();
return;
}
}
}
static LayoutTextFragment* FirstLetterPartFor(
const LayoutObject* layout_object) {
// TODO(yoichio): LayoutText::GetFirstLetterPart() should be typed
// LayoutTextFragment.
if (const LayoutText* layout_text = ToLayoutTextOrNull(layout_object))
return ToLayoutTextFragment(layout_text->GetFirstLetterPart());
return nullptr;
}
static void SetShouldInvalidateIfNeeded(const Node& node) {
LayoutObject* layout_object = node.GetLayoutObject();
if (!layout_object)
return;
if (LayoutTextFragment* first_letter = FirstLetterPartFor(layout_object))
SetShouldInvalidateIfNeeded(first_letter);
SetShouldInvalidateIfNeeded(layout_object);
}
static void SetSelectionStateIfNeeded(const Node& node, SelectionState state) {
DCHECK_NE(state, SelectionState::kContain) << node;
DCHECK_NE(state, SelectionState::kNone) << node;
LayoutObject* layout_object = node.GetLayoutObject();
if (layout_object->GetSelectionState() == state)
return;
layout_object->SetSelectionState(state);
// Set ancestors SelectionState kContain for CSS ::selection style.
// See LayoutObject::InvalidateSelectedChildrenOnStyleChange().
for (Node& ancestor : FlatTreeTraversal::AncestorsOf(node)) {
LayoutObject* ancestor_layout = ancestor.GetLayoutObject();
if (!ancestor_layout)
continue;
if (ancestor_layout->GetSelectionState() == SelectionState::kContain)
return;
ancestor_layout->LayoutObject::SetSelectionState(SelectionState::kContain);
}
}
// Set ShouldInvalidateSelection flag of LayoutObjects
// comparing them in |new_range| and |old_range|.
static void SetShouldInvalidateSelection(
const NewPaintRangeAndSelectedNodes& new_range,
const OldSelectedNodes& old_selected_objects) {
// We invalidate each LayoutObject in
// MakeGarbageCollected<SelectionPaintRange> which has SelectionState of
// kStart, kEnd, kStartAndEnd, or kInside and is not in old
// SelectionPaintRange.
for (const Node* node : new_range.selected_objects) {
if (old_selected_objects.selected_map.Contains(node))
continue;
const SelectionState new_state =
node->GetLayoutObject()->GetSelectionState();
DCHECK_NE(new_state, SelectionState::kContain) << node;
DCHECK_NE(new_state, SelectionState::kNone) << node;
SetShouldInvalidateIfNeeded(*node);
}
// For LayoutObject in old SelectionPaintRange, we invalidate LayoutObjects
// each of:
// 1. LayoutObject was painted and would not be painted.
// 2. LayoutObject was not painted and would be painted.
for (const auto& key_value : old_selected_objects.selected_map) {
const Node* const node = key_value.key;
const SelectionState old_state = key_value.value;
const SelectionState new_state =
node->GetLayoutObject()->GetSelectionState();
if (new_state == old_state)
continue;
DCHECK(new_state != SelectionState::kNone ||
old_state != SelectionState::kNone)
<< node;
DCHECK_NE(new_state, SelectionState::kContain) << node;
DCHECK_NE(old_state, SelectionState::kContain) << node;
SetShouldInvalidateIfNeeded(*node);
}
// Invalidate Selection start/end is moving on a same node.
const SelectionPaintRange& new_paint_range = *new_range.paint_range;
const SelectionPaintRange& old_paint_range =
*old_selected_objects.paint_range;
if (new_paint_range.IsNull())
return;
if (new_paint_range.start_node->IsTextNode() &&
new_paint_range.start_node == old_paint_range.start_node &&
new_paint_range.start_offset != old_paint_range.start_offset)
SetShouldInvalidateIfNeeded(*new_paint_range.start_node);
if (new_paint_range.end_node->IsTextNode() &&
new_paint_range.end_node == old_paint_range.end_node &&
new_paint_range.end_offset != old_paint_range.end_offset)
SetShouldInvalidateIfNeeded(*new_paint_range.end_node);
}
static bool IsDisplayContentElement(const Node& node) {
if (!node.IsElementNode())
return false;
const ComputedStyle* const style = node.GetComputedStyle();
return style && style->Display() == EDisplay::kContents;
}
template <typename Visitor>
static void VisitSelectedInclusiveDescendantsOfInternal(const Node& node,
Visitor* visitor) {
// Display:content element appears in a flat tree even it doesn't have
// a LayoutObject but we need to visit its children.
if (!IsDisplayContentElement(node)) {
LayoutObject* layout_object = node.GetLayoutObject();
if (!layout_object)
return;
if (layout_object->GetSelectionState() == SelectionState::kNone)
return;
visitor->Visit(node);
}
for (Node& child : FlatTreeTraversal::ChildrenOf(node))
VisitSelectedInclusiveDescendantsOfInternal(child, visitor);
}
static inline bool IsFlatTreeClean(const Node& node) {
return !node.GetDocument().IsSlotAssignmentOrLegacyDistributionDirty();
}
template <typename Visitor>
static void VisitSelectedInclusiveDescendantsOf(const Node& node,
Visitor* visitor) {
DCHECK(IsFlatTreeClean(node));
return VisitSelectedInclusiveDescendantsOfInternal(node, visitor);
}
static OldSelectedNodes ResetOldSelectedNodes(
const Node& root,
base::Optional<unsigned> old_start_offset,
base::Optional<unsigned> old_end_offset) {
class OldSelectedVisitor {
STACK_ALLOCATED();
public:
OldSelectedVisitor(base::Optional<unsigned> passed_old_start_offset,
base::Optional<unsigned> passed_old_end_offset)
: old_start_offset(passed_old_start_offset),
old_end_offset(passed_old_end_offset) {}
void Visit(const Node& node) {
LayoutObject* layout_object = node.GetLayoutObject();
const SelectionState old_state = layout_object->GetSelectionState();
DCHECK_NE(old_state, SelectionState::kNone) << node;
layout_object->SetSelectionState(SelectionState::kNone);
if (old_state == SelectionState::kContain)
return;
old_selected_objects.selected_map.insert(&node, old_state);
if (old_state == SelectionState::kInside)
return;
switch (old_state) {
case SelectionState::kStart: {
DCHECK(!old_selected_objects.paint_range->start_node);
old_selected_objects.paint_range->start_node = node;
old_selected_objects.paint_range->start_offset = old_start_offset;
break;
}
case SelectionState::kEnd: {
DCHECK(!old_selected_objects.paint_range->end_node);
old_selected_objects.paint_range->end_node = node;
old_selected_objects.paint_range->end_offset = old_end_offset;
break;
}
case SelectionState::kStartAndEnd: {
DCHECK(!old_selected_objects.paint_range->start_node);
DCHECK(!old_selected_objects.paint_range->end_node);
old_selected_objects.paint_range->start_node = node;
old_selected_objects.paint_range->start_offset = old_start_offset;
old_selected_objects.paint_range->end_node = node;
old_selected_objects.paint_range->end_offset = old_end_offset;
break;
}
default: {
NOTREACHED();
break;
}
}
}
OldSelectedNodes old_selected_objects;
const base::Optional<unsigned> old_start_offset;
const base::Optional<unsigned> old_end_offset;
} visitor(old_start_offset, old_end_offset);
VisitSelectedInclusiveDescendantsOf(root, &visitor);
return std::move(visitor.old_selected_objects);
}
static base::Optional<unsigned> ComputeStartOffset(
const Node& node,
const PositionInFlatTree& selection_start) {
if (!node.IsTextNode())
return base::nullopt;
if (&node == selection_start.AnchorNode())
return selection_start.OffsetInContainerNode();
return 0;
}
static base::Optional<unsigned> ComputeEndOffset(
const Node& node,
const PositionInFlatTree& selection_end) {
auto* text_node = DynamicTo<Text>(node);
if (!text_node)
return base::nullopt;
if (&node == selection_end.AnchorNode())
return selection_end.OffsetInContainerNode();
return text_node->length();
}
#if DCHECK_IS_ON()
// Position should be offset on text or before/after a break element.
static bool IsPositionValidText(const Position& position) {
if (position.AnchorNode()->IsTextNode() && position.IsOffsetInAnchor())
return true;
if ((IsA<HTMLBRElement>(position.AnchorNode()) ||
IsA<HTMLWBRElement>(position.AnchorNode())) &&
(position.IsBeforeAnchor() || position.IsAfterAnchor()))
return true;
return false;
}
#endif
static base::Optional<unsigned> GetTextContentOffset(const Position& position) {
if (position.IsNull())
return base::nullopt;
#if DCHECK_IS_ON()
DCHECK(IsPositionValidText(position));
#endif
DCHECK(ShouldUseLayoutNGTextContent(*position.AnchorNode()));
const NGOffsetMapping* const offset_mapping =
NGOffsetMapping::GetFor(position);
DCHECK(offset_mapping);
const base::Optional<unsigned>& ng_offset =
offset_mapping->GetTextContentOffset(position);
return ng_offset;
}
// Computes text content offset of selection start if |layout_object| is
// LayoutText.
static base::Optional<unsigned> GetTextContentOffsetStart(
const Node& node,
base::Optional<unsigned> node_offset) {
if (!node.GetLayoutObject()->IsText())
return base::nullopt;
if (node.IsTextNode()) {
DCHECK(node_offset.has_value()) << node;
return GetTextContentOffset(Position(node, node_offset.value()));
}
DCHECK(IsA<HTMLWBRElement>(node) || IsA<HTMLBRElement>(node)) << node;
DCHECK(!node_offset.has_value()) << node;
return GetTextContentOffset(Position::BeforeNode(node));
}
// Computes text content offset of selection end if |layout_object| is
// LayoutText.
static base::Optional<unsigned> GetTextContentOffsetEnd(
const Node& node,
base::Optional<unsigned> node_offset) {
if (!node.GetLayoutObject()->IsText())
return {};
if (node.IsTextNode()) {
DCHECK(node_offset.has_value()) << node;
return GetTextContentOffset(Position(node, node_offset.value()));
}
DCHECK(IsA<HTMLWBRElement>(node) || IsA<HTMLBRElement>(node)) << node;
DCHECK(!node_offset.has_value()) << node;
return GetTextContentOffset(Position::AfterNode(node));
}
static SelectionPaintRange* ComputeNewPaintRange(
const SelectionPaintRange& paint_range) {
DCHECK(!paint_range.IsNull());
const Node& start_node = *paint_range.start_node;
// If LayoutObject is not in NG, use legacy offset.
const base::Optional<unsigned> start_offset =
ShouldUseLayoutNGTextContent(start_node)
? GetTextContentOffsetStart(start_node, paint_range.start_offset)
: paint_range.start_offset;
const Node& end_node = *paint_range.end_node;
const base::Optional<unsigned> end_offset =
ShouldUseLayoutNGTextContent(end_node)
? GetTextContentOffsetEnd(end_node, paint_range.end_offset)
: paint_range.end_offset;
return MakeGarbageCollected<SelectionPaintRange>(
*paint_range.start_node, start_offset, *paint_range.end_node, end_offset);
}
static unsigned ClampOffset(unsigned offset,
unsigned start_offset,
unsigned end_offset) {
DCHECK_LE(start_offset, end_offset);
return std::min(std::max(offset, start_offset), end_offset);
}
static Text* AssociatedTextNode(const LayoutText& text) {
if (const LayoutTextFragment* fragment = ToLayoutTextFragmentOrNull(text))
return fragment->AssociatedTextNode();
if (Node* node = text.GetNode())
return DynamicTo<Text>(node);
return nullptr;
}
static SelectionState GetSelectionStateFor(const LayoutText& layout_text) {
if (const LayoutTextFragment* text_fragment =
ToLayoutTextFragmentOrNull(layout_text)) {
Node* node = text_fragment->AssociatedTextNode();
if (!node)
return SelectionState::kNone;
return node->GetLayoutObject()->GetSelectionState();
}
return layout_text.GetSelectionState();
}
static SelectionState GetSelectionStateFor(const NGInlineCursor& cursor) {
DCHECK(cursor.Current().GetLayoutObject() &&
cursor.Current().GetLayoutObject()->IsText());
return GetSelectionStateFor(
ToLayoutText(*cursor.Current().GetLayoutObject()));
}
bool LayoutSelection::IsSelected(const LayoutObject& layout_object) {
if (const LayoutText* layout_text = ToLayoutTextOrNull(layout_object))
return GetSelectionStateFor(*layout_text) != SelectionState::kNone;
return layout_object.GetSelectionState() != SelectionState::kNone;
}
static inline unsigned ClampOffset(unsigned node_offset,
const LayoutTextFragment& fragment) {
if (fragment.Start() > node_offset)
return 0;
return std::min(node_offset - fragment.Start(), fragment.FragmentLength());
}
static LayoutTextSelectionStatus ComputeSelectionStatusForNode(
const Text& text,
SelectionState selection_state,
base::Optional<unsigned> start_offset,
base::Optional<unsigned> end_offset) {
switch (selection_state) {
case SelectionState::kInside:
return {0, text.length(), SelectionIncludeEnd::kInclude};
case SelectionState::kStart:
return {start_offset.value(), text.length(),
SelectionIncludeEnd::kInclude};
case SelectionState::kEnd:
return {0, end_offset.value(), SelectionIncludeEnd::kNotInclude};
case SelectionState::kStartAndEnd:
return {start_offset.value(), end_offset.value(),
SelectionIncludeEnd::kNotInclude};
default:
NOTREACHED();
return {0, 0, SelectionIncludeEnd::kNotInclude};
}
}
LayoutTextSelectionStatus LayoutSelection::ComputeSelectionStatus(
const LayoutText& layout_text) const {
AssertIsValid();
const SelectionState selection_state = GetSelectionStateFor(layout_text);
if (selection_state == SelectionState::kNone)
return {0, 0, SelectionIncludeEnd::kNotInclude};
if (Text* text = AssociatedTextNode(layout_text)) {
const LayoutTextSelectionStatus text_status = ComputeSelectionStatusForNode(
*text, selection_state, paint_range_->start_offset,
paint_range_->end_offset);
if (const LayoutTextFragment* text_fragment =
ToLayoutTextFragmentOrNull(layout_text)) {
return {ClampOffset(text_status.start, *text_fragment),
ClampOffset(text_status.end, *text_fragment),
text_status.include_end};
}
return text_status;
}
// TODO(yoichio): This is really weird legacy behavior. Remove this.
if (layout_text.IsBR() && selection_state == SelectionState::kEnd)
return {0, 0, SelectionIncludeEnd::kNotInclude};
return {0, layout_text.TextLength(), SelectionIncludeEnd::kInclude};
}
LayoutTextSelectionStatus FrameSelection::ComputeLayoutSelectionStatus(
const LayoutText& text) const {
return layout_selection_->ComputeSelectionStatus(text);
}
// FrameSelection holds selection offsets in layout block flow at
// LayoutSelection::Commit() if selection starts/ends within Text that
// each LayoutObject::SelectionState indicates.
// These offset can be out of fragment because SelectionState is of each
// LayoutText and not of each fragment for it.
LayoutSelectionStatus LayoutSelection::ComputeSelectionStatus(
const NGInlineCursor& cursor) const {
// We don't paint selection on ellipsis.
if (cursor.Current().IsEllipsis())
return {0, 0, SelectSoftLineBreak::kNotSelected};
const NGTextOffset offset = cursor.Current().TextOffset();
const unsigned start_offset = offset.start;
const unsigned end_offset = offset.end;
switch (GetSelectionStateFor(cursor)) {
case SelectionState::kStart: {
const unsigned start_in_block = paint_range_->start_offset.value();
const bool is_continuous = start_in_block <= end_offset;
return {ClampOffset(start_in_block, start_offset, end_offset), end_offset,
(is_continuous && cursor.IsBeforeSoftLineBreak())
? SelectSoftLineBreak::kSelected
: SelectSoftLineBreak::kNotSelected};
}
case SelectionState::kEnd: {
const unsigned end_in_block = paint_range_->end_offset.value();
const unsigned end_in_fragment =
ClampOffset(end_in_block, start_offset, end_offset);
const bool is_continuous = end_offset < end_in_block;
return {start_offset, end_in_fragment,
(is_continuous && cursor.IsBeforeSoftLineBreak())
? SelectSoftLineBreak::kSelected
: SelectSoftLineBreak::kNotSelected};
}
case SelectionState::kStartAndEnd: {
const unsigned start_in_block = paint_range_->start_offset.value();
const unsigned end_in_block = paint_range_->end_offset.value();
const unsigned end_in_fragment =
ClampOffset(end_in_block, start_offset, end_offset);
const bool is_continuous =
start_in_block <= end_offset && end_offset < end_in_block;
return {ClampOffset(start_in_block, start_offset, end_offset),
end_in_fragment,
(is_continuous && cursor.IsBeforeSoftLineBreak())
? SelectSoftLineBreak::kSelected
: SelectSoftLineBreak::kNotSelected};
}
case SelectionState::kInside: {
return {start_offset, end_offset,
cursor.IsBeforeSoftLineBreak()
? SelectSoftLineBreak::kSelected
: SelectSoftLineBreak::kNotSelected};
}
default:
// This block is not included in selection.
return {0, 0, SelectSoftLineBreak::kNotSelected};
}
}
static NewPaintRangeAndSelectedNodes CalcSelectionRangeAndSetSelectionState(
const FrameSelection& frame_selection) {
const SelectionInDOMTree& selection_in_dom =
frame_selection.GetSelectionInDOMTree();
if (selection_in_dom.IsNone())
return {};
const EphemeralRangeInFlatTree& selection =
CalcSelectionInFlatTree(frame_selection);
if (selection.IsCollapsed() || frame_selection.IsHidden())
return {};
// Find first/last Node which has a visible LayoutObject while
// marking SelectionState and collecting invalidation candidate LayoutObjects.
const Node* start_node = nullptr;
const Node* end_node = nullptr;
HeapHashSet<Member<const Node>> selected_objects;
for (Node& node : selection.Nodes()) {
LayoutObject* const layout_object = node.GetLayoutObject();
if (!layout_object || !layout_object->CanBeSelectionLeaf())
continue;
if (!start_node) {
DCHECK(!end_node);
start_node = end_node = &node;
continue;
}
// In this loop, |end_node| is pointing current last candidate
// LayoutObject and if it is not start and we find next, we mark the
// current one as kInside.
if (end_node != start_node) {
SetSelectionStateIfNeeded(*end_node, SelectionState::kInside);
selected_objects.insert(end_node);
}
end_node = &node;
}
// No valid LayOutObject found.
if (!start_node) {
DCHECK(!end_node);
return {};
}
// Compute offset. It has value iff start/end is text.
const base::Optional<unsigned> start_offset = ComputeStartOffset(
*start_node, selection.StartPosition().ToOffsetInAnchor());
const base::Optional<unsigned> end_offset =
ComputeEndOffset(*end_node, selection.EndPosition().ToOffsetInAnchor());
if (start_node == end_node) {
SetSelectionStateIfNeeded(*start_node, SelectionState::kStartAndEnd);
selected_objects.insert(start_node);
} else {
SetSelectionStateIfNeeded(*start_node, SelectionState::kStart);
selected_objects.insert(start_node);
SetSelectionStateIfNeeded(*end_node, SelectionState::kEnd);
selected_objects.insert(end_node);
}
SelectionPaintRange* new_range = MakeGarbageCollected<SelectionPaintRange>(
*start_node, start_offset, *end_node, end_offset);
if (!RuntimeEnabledFeatures::LayoutNGEnabled())
return {new_range, std::move(selected_objects)};
return {ComputeNewPaintRange(*new_range), std::move(selected_objects)};
}
void LayoutSelection::SetHasPendingSelection() {
has_pending_selection_ = true;
}
void LayoutSelection::Commit() {
if (!has_pending_selection_)
return;
has_pending_selection_ = false;
DCHECK(!frame_selection_->GetDocument().NeedsLayoutTreeUpdate());
DCHECK_GE(frame_selection_->GetDocument().Lifecycle().GetState(),
DocumentLifecycle::kLayoutClean);
DocumentLifecycle::DisallowTransitionScope disallow_transition(
frame_selection_->GetDocument().Lifecycle());
const OldSelectedNodes& old_selected_objects = ResetOldSelectedNodes(
frame_selection_->GetDocument(), paint_range_->start_offset,
paint_range_->end_offset);
const NewPaintRangeAndSelectedNodes& new_range =
CalcSelectionRangeAndSetSelectionState(*frame_selection_);
new_range.AssertSanity();
DCHECK(frame_selection_->GetDocument().GetLayoutView()->GetFrameView());
SetShouldInvalidateSelection(new_range, old_selected_objects);
paint_range_ = new_range.paint_range;
}
void LayoutSelection::ContextDestroyed() {
has_pending_selection_ = false;
paint_range_->start_node = nullptr;
paint_range_->start_offset = base::nullopt;
paint_range_->end_node = nullptr;
paint_range_->end_offset = base::nullopt;
}
static PhysicalRect SelectionRectForLayoutObject(const LayoutObject* object) {
if (!object->IsRooted())
return PhysicalRect();
if (!object->CanUpdateSelectionOnRootLineBoxes())
return PhysicalRect();
return object->AbsoluteSelectionRect();
}
template <typename Visitor>
static void VisitLayoutObjectsOf(const Node& node, Visitor* visitor) {
LayoutObject* layout_object = node.GetLayoutObject();
if (!layout_object)
return;
if (layout_object->GetSelectionState() == SelectionState::kContain)
return;
if (LayoutTextFragment* first_letter = FirstLetterPartFor(layout_object))
visitor->Visit(first_letter);
visitor->Visit(layout_object);
}
IntRect LayoutSelection::AbsoluteSelectionBounds() {
Commit();
if (paint_range_->IsNull())
return IntRect();
// Create a single bounding box rect that encloses the whole selection.
class SelectionBoundsVisitor {
STACK_ALLOCATED();
public:
void Visit(const Node& node) { VisitLayoutObjectsOf(node, this); }
void Visit(LayoutObject* layout_object) {
selected_rect.Unite(SelectionRectForLayoutObject(layout_object));
}
PhysicalRect selected_rect;
} visitor;
VisitSelectedInclusiveDescendantsOf(frame_selection_->GetDocument(),
&visitor);
return PixelSnappedIntRect(visitor.selected_rect);
}
void LayoutSelection::InvalidatePaintForSelection() {
if (paint_range_->IsNull())
return;
class InvalidatingVisitor {
STACK_ALLOCATED();
public:
void Visit(const Node& node) { VisitLayoutObjectsOf(node, this); }
void Visit(LayoutObject* layout_object) {
layout_object->SetShouldInvalidateSelection();
}
} visitor;
VisitSelectedInclusiveDescendantsOf(frame_selection_->GetDocument(),
&visitor);
}
void LayoutSelection::Trace(Visitor* visitor) {
visitor->Trace(frame_selection_);
visitor->Trace(paint_range_);
}
void PrintSelectionStatus(std::ostream& ostream, const Node& node) {
ostream << (void*)&node;
if (node.IsTextNode())
ostream << "#text";
else if (const auto* element = DynamicTo<Element>(node))
ostream << element->tagName().Utf8();
LayoutObject* layout_object = node.GetLayoutObject();
if (!layout_object) {
ostream << " <null LayoutObject>";
return;
}
ostream << ' ' << layout_object->GetSelectionState();
}
#if DCHECK_IS_ON()
std::ostream& operator<<(std::ostream& ostream,
const base::Optional<unsigned>& offset) {
if (offset.has_value())
ostream << offset.value();
else
ostream << "<nullopt>";
return ostream;
}
std::ostream& operator<<(std::ostream& ostream,
const SelectionPaintRange& range) {
ostream << range.start_node << ": " << range.start_offset << ", "
<< range.end_node << ": " << range.end_offset;
return ostream;
}
std::ostream& operator<<(
std::ostream& ostream,
const HeapHashMap<Member<const Node>, SelectionState>& map) {
ostream << "[";
const char* comma = "";
for (const auto& key_value : map) {
const Node* const node = key_value.key;
const SelectionState old_state = key_value.value;
ostream << comma << node << "." << old_state;
comma = ", ";
}
ostream << "]";
return ostream;
}
std::ostream& operator<<(std::ostream& ostream,
const OldSelectedNodes& old_node) {
ostream << old_node.paint_range << ". " << old_node.selected_map;
return ostream;
}
void PrintOldSelectedNodes(const OldSelectedNodes& old_node) {
std::stringstream stream;
stream << std::endl << old_node;
LOG(INFO) << stream.str();
}
std::ostream& operator<<(
std::ostream& ostream,
const HeapHashSet<Member<const Node>>& selected_objects) {
ostream << "[";
const char* comma = "";
for (const Node* node : selected_objects) {
ostream << comma;
PrintSelectionStatus(ostream, *node);
comma = ", ";
}
ostream << "]";
return ostream;
}
std::ostream& operator<<(std::ostream& ostream,
const NewPaintRangeAndSelectedNodes& new_range) {
ostream << new_range.paint_range << ". " << new_range.selected_objects;
return ostream;
}
void PrintSelectedNodes(const NewPaintRangeAndSelectedNodes& new_range) {
std::stringstream stream;
stream << std::endl << new_range;
LOG(INFO) << stream.str();
}
void PrintSelectionStateInDocument(const FrameSelection& selection) {
class PrintVisitor {
STACK_ALLOCATED();
public:
void Visit(const Node& node) { PrintSelectionStatus(stream, node); }
std::stringstream stream;
} visitor;
VisitSelectedInclusiveDescendantsOf(selection.GetDocument(), &visitor);
LOG(INFO) << std::endl << visitor.stream.str();
}
#endif
} // namespace blink