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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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_INLINE_NG_LINE_TRUNCATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_INLINE_NG_LINE_TRUNCATOR_H_
#include "base/optional.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_line_box_fragment_builder.h"
#include "third_party/blink/renderer/platform/text/text_direction.h"
namespace blink {
class NGInlineLayoutStateStack;
class NGLineInfo;
// A class to truncate lines and place ellipsis, invoked by the CSS
// 'text-overflow: ellipsis' property.
// https://drafts.csswg.org/css-ui/#overflow-ellipsis
class CORE_EXPORT NGLineTruncator final {
STACK_ALLOCATED();
public:
NGLineTruncator(const NGLineInfo& line_info);
// Truncate |line_box| and place ellipsis. Returns the new inline-size of the
// |line_box|.
//
// |line_box| should be after bidi reorder, but before box fragments are
// created.
LayoutUnit TruncateLine(LayoutUnit line_width,
NGLineBoxFragmentBuilder::ChildList* line_box,
NGInlineLayoutStateStack* box_states);
LayoutUnit TruncateLineInTheMiddle(
LayoutUnit line_width,
NGLineBoxFragmentBuilder::ChildList* line_box,
NGInlineLayoutStateStack* box_states);
private:
const ComputedStyle& EllipsisStyle() const;
// Initialize four ellipsis_*_ data members.
void SetupEllipsis();
// Add a child for ellipsis next to |ellipsized_child|.
LayoutUnit PlaceEllipsisNextTo(
NGLineBoxFragmentBuilder::ChildList* line_box,
NGLineBoxFragmentBuilder::Child* ellipsized_child);
static constexpr wtf_size_t kDidNotAddChild = WTF::kNotFound;
// Add a child with truncated text of (*line_box)[source_index].
// This function returns the index of the new child.
// If the truncated text is empty, kDidNotAddChild is returned.
//
// |leave_one_character| - Force to leave at least one character regardless of
// |position|.
// |position| and |edge| - Indicate truncation point and direction.
// If |edge| is TextDirection::kLtr, the left side of
// |position| will be copied to the new child.
// Otherwise, the right side of |position| will be
// copied.
wtf_size_t AddTruncatedChild(wtf_size_t source_index,
bool leave_one_character,
LayoutUnit position,
TextDirection edge,
NGLineBoxFragmentBuilder::ChildList* line_box,
NGInlineLayoutStateStack* box_states);
bool EllipsizeChild(
LayoutUnit line_width,
LayoutUnit ellipsis_width,
bool is_first_child,
NGLineBoxFragmentBuilder::Child*,
scoped_refptr<const NGPhysicalTextFragment>* truncated_fragment);
bool TruncateChild(
LayoutUnit space_for_this_child,
bool is_first_child,
const NGLineBoxFragmentBuilder::Child& child,
scoped_refptr<const NGPhysicalTextFragment>* truncated_fragment);
void HideChild(NGLineBoxFragmentBuilder::Child* child);
scoped_refptr<const ComputedStyle> line_style_;
LayoutUnit available_width_;
TextDirection line_direction_;
// The following 3 data members are available after SetupEllipsis().
const SimpleFontData* ellipsis_font_data_;
String ellipsis_text_;
LayoutUnit ellipsis_width_;
// This data member is available between SetupEllipsis() and
// PlaceEllipsisNextTo().
scoped_refptr<ShapeResultView> ellipsis_shape_result_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_INLINE_NG_LINE_TRUNCATOR_H_
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