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// Copyright 2016 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_FRAGMENTAINER_ITERATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_FRAGMENTAINER_ITERATOR_H_
#include "third_party/blink/renderer/core/layout/multi_column_fragmentainer_group.h"
#include "third_party/blink/renderer/platform/geometry/layout_rect.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
namespace blink {
class LayoutFlowThread;
class LayoutMultiColumnSet;
// Used to find the fragmentainers that intersect with a given portion of the
// flow thread. The portion typically corresponds to the bounds of some
// descendant layout object. The iterator walks in block direction order.
class FragmentainerIterator {
STACK_ALLOCATED();
public:
// Initialize the iterator, and move to the first fragmentainer of interest.
// The clip rectangle is optional. If it's empty, it means that no clipping
// will be performed, and that the only thing that can limit the set of
// fragmentainers to visit is |physicalBoundingBox|.
FragmentainerIterator(
const LayoutFlowThread&,
const LayoutRect& physical_bounding_box_in_flow_thread,
const LayoutRect& clip_rect_in_multicol_container = LayoutRect());
// Advance to the next fragmentainer. Not allowed to call this if atEnd() is
// true.
void Advance();
// Return true if we have walked through all relevant fragmentainers.
bool AtEnd() const { return !current_column_set_; }
// The physical translation to apply to shift the box when converting from
// flowthread to visual coordinates.
LayoutSize PaginationOffset() const;
// The logical top of the current fragmentainer in flowthread.
LayoutUnit FragmentainerLogicalTopInFlowThread() const;
// Return the physical clip rectangle of the current fragmentainer, relative
// to the flow thread.
LayoutRect ClipRectInFlowThread() const;
private:
const LayoutFlowThread& flow_thread_;
const LayoutRect clip_rect_in_multicol_container_;
const LayoutMultiColumnSet* current_column_set_;
unsigned current_fragmentainer_group_index_;
unsigned current_fragmentainer_index_;
unsigned end_fragmentainer_index_;
LayoutUnit logical_top_in_flow_thread_;
LayoutUnit logical_bottom_in_flow_thread_;
const MultiColumnFragmentainerGroup& CurrentGroup() const;
void MoveToNextFragmentainerGroup();
bool SetFragmentainersOfInterest();
void SetAtEnd() { current_column_set_ = nullptr; }
bool HasClipRect() const {
return !clip_rect_in_multicol_container_.IsEmpty();
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_FRAGMENTAINER_ITERATOR_H_
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