blob: 6f1c1c55da8f71269a57777504a1135d6a9d0b64 [file] [log] [blame]
// Copyright 2014 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 LayoutMultiColumnSpannerPlaceholder_h
#define LayoutMultiColumnSpannerPlaceholder_h
#include "core/layout/LayoutBlockFlow.h"
namespace blink {
// Placeholder layoutObject for column-span:all elements. The column-span:all
// layoutObject itself is a descendant of the flow thread, but due to its
// out-of-flow nature, we need something on the outside to take care of its
// positioning and sizing. LayoutMultiColumnSpannerPlaceholder objects are
// siblings of LayoutMultiColumnSet objects, i.e. direct children of the
// multicol container.
class LayoutMultiColumnSpannerPlaceholder final : public LayoutBox {
bool IsOfType(LayoutObjectType type) const override {
return type == kLayoutObjectLayoutMultiColumnSpannerPlaceholder ||
static LayoutMultiColumnSpannerPlaceholder* CreateAnonymous(
const ComputedStyle& parent_style,
LayoutMultiColumnFlowThread* FlowThread() const {
return ToLayoutBlockFlow(Parent())->MultiColumnFlowThread();
LayoutBox* LayoutObjectInFlowThread() const {
return layout_object_in_flow_thread_;
void MarkForLayoutIfObjectInFlowThreadNeedsLayout() {
if (!layout_object_in_flow_thread_->NeedsLayout())
// The containing block of a spanner is the multicol container (our parent
// here), but the spanner is laid out via its spanner set (us), so we need
// to make sure that we enter it.
void LayoutObjectInFlowThreadStyleDidChange(const ComputedStyle* old_style);
void UpdateMarginProperties();
const char* GetName() const override {
return "LayoutMultiColumnSpannerPlaceholder";
void InsertedIntoTree() override;
void WillBeRemovedFromTree() override;
bool NeedsPreferredWidthsRecalculation() const override;
LayoutUnit MinPreferredLogicalWidth() const override;
LayoutUnit MaxPreferredLogicalWidth() const override;
void UpdateLayout() override;
void ComputeLogicalHeight(LayoutUnit logical_height,
LayoutUnit logical_top,
LogicalExtentComputedValues&) const override;
void Paint(const PaintInfo&, const LayoutPoint& paint_offset) const override;
bool NodeAtPoint(HitTestResult&,
const HitTestLocation& location_in_container,
const LayoutPoint& accumulated_offset,
HitTestAction) override;
// The actual column-span:all layoutObject inside the flow thread.
LayoutBox* layout_object_in_flow_thread_;
} // namespace blink