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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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 FragmentainerIterator_h | 5 #ifndef FragmentainerIterator_h |
6 #define FragmentainerIterator_h | 6 #define FragmentainerIterator_h |
7 | 7 |
8 #include "core/layout/LayoutFlowThread.h" | 8 #include "core/layout/LayoutFlowThread.h" |
9 | 9 |
10 namespace blink { | 10 namespace blink { |
11 | 11 |
12 class MultiColumnFragmentainerGroup; | 12 class MultiColumnFragmentainerGroup; |
13 | 13 |
14 // Used to find the fragmentainers that intersect with a given portion of the | 14 // Used to find the fragmentainers that intersect with a given portion of the fl
ow thread. The |
15 // flow thread. The portion typically corresponds to the bounds of some | 15 // portion typically corresponds to the bounds of some descendant layout object.
The iterator walks |
16 // descendant layout object. The iterator walks in block direction order. | 16 // in block direction order. |
17 class FragmentainerIterator { | 17 class FragmentainerIterator { |
18 public: | 18 public: |
19 // Initialize the iterator, and move to the first fragmentainer of interest. | 19 // Initialize the iterator, and move to the first fragmentainer of interest. |
20 // The clip rectangle is optional. If it's empty, it means that no clipping | 20 // The clip rectangle is optional. If it's empty, it means that no clipping wi
ll be performed, |
21 // will be performed, and that the only thing that can limit the set of | 21 // and that the only thing that can limit the set of fragmentainers to visit i
s |
22 // fragmentainers to visit is |physicalBoundingBox|. | 22 // |physicalBoundingBox|. |
23 FragmentainerIterator( | 23 FragmentainerIterator( |
24 const LayoutFlowThread&, | 24 const LayoutFlowThread&, |
25 const LayoutRect& physicalBoundingBoxInFlowThread, | 25 const LayoutRect& physicalBoundingBoxInFlowThread, |
26 const LayoutRect& clipRectInMulticolContainer = LayoutRect()); | 26 const LayoutRect& clipRectInMulticolContainer = LayoutRect()); |
27 | 27 |
28 // Advance to the next fragmentainer. Not allowed to call this if atEnd() is | 28 // Advance to the next fragmentainer. Not allowed to call this if atEnd() is t
rue. |
29 // true. | |
30 void advance(); | 29 void advance(); |
31 | 30 |
32 // Return true if we have walked through all relevant fragmentainers. | 31 // Return true if we have walked through all relevant fragmentainers. |
33 bool atEnd() const { return !m_currentColumnSet; } | 32 bool atEnd() const { return !m_currentColumnSet; } |
34 | 33 |
35 // The physical translation to apply to shift the box when converting from | 34 // The physical translation to apply to shift the box when converting from flo
wthread to visual |
36 // flowthread to visual coordinates. | 35 // coordinates. |
37 LayoutSize paginationOffset() const; | 36 LayoutSize paginationOffset() const; |
38 | 37 |
39 // Return the physical content box of the current fragmentainer, relative to | 38 // Return the physical content box of the current fragmentainer, relative to t
he flow thread. |
40 // the flow thread. | |
41 LayoutRect fragmentainerInFlowThread() const; | 39 LayoutRect fragmentainerInFlowThread() const; |
42 | 40 |
43 // Return the physical clip rectangle of the current fragmentainer, relative | 41 // Return the physical clip rectangle of the current fragmentainer, relative t
o the flow thread. |
44 // to the flow thread. | |
45 LayoutRect clipRectInFlowThread() const; | 42 LayoutRect clipRectInFlowThread() const; |
46 | 43 |
47 private: | 44 private: |
48 const LayoutFlowThread& m_flowThread; | 45 const LayoutFlowThread& m_flowThread; |
49 const LayoutRect m_clipRectInMulticolContainer; | 46 const LayoutRect m_clipRectInMulticolContainer; |
50 | 47 |
51 const LayoutMultiColumnSet* m_currentColumnSet; | 48 const LayoutMultiColumnSet* m_currentColumnSet; |
52 unsigned m_currentFragmentainerGroupIndex; | 49 unsigned m_currentFragmentainerGroupIndex; |
53 unsigned m_currentFragmentainerIndex; | 50 unsigned m_currentFragmentainerIndex; |
54 unsigned m_endFragmentainerIndex; | 51 unsigned m_endFragmentainerIndex; |
55 | 52 |
56 LayoutUnit m_logicalTopInFlowThread; | 53 LayoutUnit m_logicalTopInFlowThread; |
57 LayoutUnit m_logicalBottomInFlowThread; | 54 LayoutUnit m_logicalBottomInFlowThread; |
58 | 55 |
59 const MultiColumnFragmentainerGroup& currentGroup() const; | 56 const MultiColumnFragmentainerGroup& currentGroup() const; |
60 void moveToNextFragmentainerGroup(); | 57 void moveToNextFragmentainerGroup(); |
61 bool setFragmentainersOfInterest(); | 58 bool setFragmentainersOfInterest(); |
62 void setAtEnd() { m_currentColumnSet = nullptr; } | 59 void setAtEnd() { m_currentColumnSet = nullptr; } |
63 bool hasClipRect() const { return !m_clipRectInMulticolContainer.isEmpty(); } | 60 bool hasClipRect() const { return !m_clipRectInMulticolContainer.isEmpty(); } |
64 }; | 61 }; |
65 | 62 |
66 } // namespace blink | 63 } // namespace blink |
67 | 64 |
68 #endif // FragmentainerIterator_h | 65 #endif // FragmentainerIterator_h |
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