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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef LayoutMultiColumnSpannerPlaceholder_h | 5 #ifndef LayoutMultiColumnSpannerPlaceholder_h |
6 #define LayoutMultiColumnSpannerPlaceholder_h | 6 #define LayoutMultiColumnSpannerPlaceholder_h |
7 | 7 |
8 #include "core/layout/LayoutMultiColumnFlowThread.h" | 8 #include "core/layout/LayoutMultiColumnFlowThread.h" |
9 | 9 |
10 namespace blink { | 10 namespace blink { |
11 | 11 |
12 // Placeholder layoutObject for column-span:all elements. The column-span:all la
youtObject itself is a | 12 // Placeholder layoutObject for column-span:all elements. The column-span:all la
youtObject itself is a |
13 // descendant of the flow thread, but due to its out-of-flow nature, we need som
ething on the | 13 // descendant of the flow thread, but due to its out-of-flow nature, we need som
ething on the |
14 // outside to take care of its positioning and sizing. LayoutMultiColumnSpannerP
laceholder objects | 14 // outside to take care of its positioning and sizing. LayoutMultiColumnSpannerP
laceholder objects |
15 // are siblings of LayoutMultiColumnSet objects, i.e. direct children of the mul
ticol container. | 15 // are siblings of LayoutMultiColumnSet objects, i.e. direct children of the mul
ticol container. |
16 class LayoutMultiColumnSpannerPlaceholder final : public LayoutBox { | 16 class LayoutMultiColumnSpannerPlaceholder final : public LayoutBox { |
17 public: | 17 public: |
18 virtual bool isOfType(LayoutObjectType type) const override { return type ==
LayoutObjectLayoutMultiColumnSpannerPlaceholder || LayoutBox::isOfType(type); } | 18 virtual bool isOfType(LayoutObjectType type) const override { return type ==
LayoutObjectLayoutMultiColumnSpannerPlaceholder || LayoutBox::isOfType(type); } |
19 | 19 |
20 static LayoutMultiColumnSpannerPlaceholder* createAnonymous(const ComputedSt
yle& parentStyle, LayoutBox&); | 20 static LayoutMultiColumnSpannerPlaceholder* createAnonymous(const ComputedSt
yle& parentStyle, LayoutBox&); |
21 | 21 |
22 LayoutFlowThread* flowThread() const { return toLayoutBlockFlow(parent())->m
ultiColumnFlowThread(); } | 22 LayoutMultiColumnFlowThread* flowThread() const { return toLayoutBlockFlow(p
arent())->multiColumnFlowThread(); } |
23 | 23 |
24 LayoutBox* layoutObjectInFlowThread() const { return m_layoutObjectInFlowThr
ead; } | 24 LayoutBox* layoutObjectInFlowThread() const { return m_layoutObjectInFlowThr
ead; } |
25 void markForLayoutIfObjectInFlowThreadNeedsLayout() | 25 void markForLayoutIfObjectInFlowThreadNeedsLayout() |
26 { | 26 { |
27 if (!m_layoutObjectInFlowThread->needsLayout()) | 27 if (!m_layoutObjectInFlowThread->needsLayout()) |
28 return; | 28 return; |
29 // The containing block of a spanner is the multicol container (our pare
nt here), but the | 29 // The containing block of a spanner is the multicol container (our pare
nt here), but the |
30 // spanner is laid out via its spanner set (us), so we need to make sure
that we enter it. | 30 // spanner is laid out via its spanner set (us), so we need to make sure
that we enter it. |
31 setChildNeedsLayout(MarkOnlyThis); | 31 setChildNeedsLayout(MarkOnlyThis); |
32 } | 32 } |
| 33 |
| 34 void layoutObjectInFlowThreadStyleDidChange(const ComputedStyle* oldStyle); |
33 void updateMarginProperties(); | 35 void updateMarginProperties(); |
34 | 36 |
35 virtual const char* name() const override { return "LayoutMultiColumnSpanner
Placeholder"; } | 37 virtual const char* name() const override { return "LayoutMultiColumnSpanner
Placeholder"; } |
36 | 38 |
37 protected: | 39 protected: |
38 virtual void willBeRemovedFromTree() override; | 40 virtual void willBeRemovedFromTree() override; |
39 virtual bool needsPreferredWidthsRecalculation() const override; | 41 virtual bool needsPreferredWidthsRecalculation() const override; |
40 virtual LayoutUnit minPreferredLogicalWidth() const override; | 42 virtual LayoutUnit minPreferredLogicalWidth() const override; |
41 virtual LayoutUnit maxPreferredLogicalWidth() const override; | 43 virtual LayoutUnit maxPreferredLogicalWidth() const override; |
42 virtual void layout() override; | 44 virtual void layout() override; |
43 virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logic
alTop, LogicalExtentComputedValues&) const override; | 45 virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logic
alTop, LogicalExtentComputedValues&) const override; |
44 virtual void invalidateTreeIfNeeded(PaintInvalidationState&) override; | 46 virtual void invalidateTreeIfNeeded(PaintInvalidationState&) override; |
45 virtual void paint(const PaintInfo&, const LayoutPoint& paintOffset) overrid
e; | 47 virtual void paint(const PaintInfo&, const LayoutPoint& paintOffset) overrid
e; |
46 virtual bool nodeAtPoint(HitTestResult&, const HitTestLocation& locationInCo
ntainer, const LayoutPoint& accumulatedOffset, HitTestAction) override; | 48 virtual bool nodeAtPoint(HitTestResult&, const HitTestLocation& locationInCo
ntainer, const LayoutPoint& accumulatedOffset, HitTestAction) override; |
47 | 49 |
48 private: | 50 private: |
49 LayoutMultiColumnSpannerPlaceholder(LayoutBox*); | 51 LayoutMultiColumnSpannerPlaceholder(LayoutBox*); |
50 | 52 |
51 LayoutBox* m_layoutObjectInFlowThread; // The actual column-span:all layoutO
bject inside the flow thread. | 53 LayoutBox* m_layoutObjectInFlowThread; // The actual column-span:all layoutO
bject inside the flow thread. |
52 }; | 54 }; |
53 | 55 |
54 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutMultiColumnSpannerPlaceholder, isLayoutMul
tiColumnSpannerPlaceholder()); | 56 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutMultiColumnSpannerPlaceholder, isLayoutMul
tiColumnSpannerPlaceholder()); |
55 | 57 |
56 } // namespace blink | 58 } // namespace blink |
57 | 59 |
58 #endif | 60 #endif |
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