| /* |
| * Copyright (C) 2011 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_FLEXIBLE_BOX_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_FLEXIBLE_BOX_H_ |
| |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/core/layout/layout_block.h" |
| #include "third_party/blink/renderer/core/layout/order_iterator.h" |
| |
| namespace blink { |
| |
| class FlexItem; |
| class FlexItemVectorView; |
| class FlexLayoutAlgorithm; |
| class FlexLine; |
| struct MinMaxSizes; |
| |
| class CORE_EXPORT LayoutFlexibleBox : public LayoutBlock { |
| public: |
| explicit LayoutFlexibleBox(Element*); |
| ~LayoutFlexibleBox() override; |
| |
| const char* GetName() const override { return "LayoutFlexibleBox"; } |
| |
| bool IsFlexibleBox() const final { return true; } |
| bool IsFlexibleBoxIncludingNG() const final { return true; } |
| bool IsFlexibleBoxIncludingDeprecatedAndNG() const final { return true; } |
| void UpdateBlockLayout(bool relayout_children) final; |
| |
| bool IsChildAllowed(LayoutObject* object, |
| const ComputedStyle& style) const override; |
| LayoutUnit BaselinePosition( |
| FontBaseline, |
| bool first_line, |
| LineDirectionMode, |
| LinePositionMode = kPositionOnContainingLine) const override; |
| |
| static LayoutUnit SynthesizedBaselineFromBorderBox(const LayoutBox&, |
| LineDirectionMode); |
| |
| LayoutUnit FirstLineBoxBaseline() const override; |
| LayoutUnit InlineBlockBaseline(LineDirectionMode) const override; |
| bool HasTopOverflow() const override; |
| bool HasLeftOverflow() const override; |
| |
| void PaintChildren(const PaintInfo&, |
| const PhysicalOffset& paint_offset) const final; |
| |
| bool IsHorizontalFlow() const; |
| |
| const OrderIterator& GetOrderIterator() const { return order_iterator_; } |
| |
| // These three functions are used when resolving percentages against a |
| // flex item's logical height. In flexbox, sometimes a logical height |
| // should be considered definite even though it normally shouldn't be, |
| // and these functions implement that logic. |
| bool CrossSizeIsDefiniteForPercentageResolution(const LayoutBox& child) const; |
| bool MainSizeIsDefiniteForPercentageResolution(const LayoutBox& child) const; |
| bool UseOverrideLogicalHeightForPerentageResolution( |
| const LayoutBox& child) const; |
| |
| void ClearCachedMainSizeForChild(const LayoutBox& child); |
| |
| LayoutUnit StaticMainAxisPositionForPositionedChild(const LayoutBox& child); |
| LayoutUnit StaticCrossAxisPositionForPositionedChild(const LayoutBox& child); |
| |
| LayoutUnit StaticInlinePositionForPositionedChild(const LayoutBox& child); |
| LayoutUnit StaticBlockPositionForPositionedChild(const LayoutBox& child); |
| |
| // Returns true if the position changed. In that case, the child will have to |
| // be laid out again. |
| bool SetStaticPositionForPositionedLayout(LayoutBox& child); |
| static bool SetStaticPositionForChildInFlexNGContainer(LayoutBox& child, |
| LayoutBlock* parent); |
| LayoutUnit CrossAxisContentExtent() const; |
| |
| protected: |
| MinMaxSizes ComputeIntrinsicLogicalWidths() const override; |
| |
| bool HitTestChildren(HitTestResult&, |
| const HitTestLocation&, |
| const PhysicalOffset& accumulated_offset, |
| HitTestAction) override; |
| |
| void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override; |
| void RemoveChild(LayoutObject*) override; |
| |
| private: |
| enum ChildLayoutType { kLayoutIfNeeded, kForceLayout, kNeverLayout }; |
| |
| enum class SizeDefiniteness { kDefinite, kIndefinite, kUnknown }; |
| |
| bool MainAxisIsInlineAxis(const LayoutBox& child) const; |
| bool IsColumnFlow() const; |
| bool IsLeftToRightFlow() const; |
| bool IsMultiline() const; |
| Length FlexBasisForChild(const LayoutBox& child) const; |
| LayoutUnit CrossAxisExtentForChild(const LayoutBox& child) const; |
| LayoutUnit CrossAxisUnstretchedExtentForChild(const LayoutBox& child) const; |
| LayoutUnit ChildUnstretchedLogicalHeight(const LayoutBox& child) const; |
| LayoutUnit ChildUnstretchedLogicalWidth(const LayoutBox& child) const; |
| LayoutUnit MainAxisExtentForChild(const LayoutBox& child) const; |
| LayoutUnit MainAxisContentExtentForChild(const LayoutBox& child) const; |
| LayoutUnit MainAxisContentExtentForChildIncludingScrollbar( |
| const LayoutBox& child) const; |
| LayoutUnit CrossAxisExtent() const; |
| LayoutUnit MainAxisContentExtent(LayoutUnit content_logical_height); |
| LayoutUnit ComputeMainAxisExtentForChild(const LayoutBox& child, |
| SizeType, |
| const Length& size, |
| LayoutUnit border_and_padding) const; |
| |
| LayoutUnit ContentInsetBottom() const; |
| LayoutUnit ContentInsetRight() const; |
| LayoutUnit FlowAwareContentInsetStart() const; |
| LayoutUnit FlowAwareContentInsetEnd() const; |
| LayoutUnit FlowAwareContentInsetBefore() const; |
| LayoutUnit FlowAwareContentInsetAfter() const; |
| |
| LayoutUnit CrossAxisScrollbarExtent() const; |
| LayoutUnit CrossAxisScrollbarExtentForChild(const LayoutBox& child) const; |
| LayoutPoint FlowAwareLocationForChild(const LayoutBox& child) const; |
| bool UseChildAspectRatio(const LayoutBox& child) const; |
| LayoutUnit ComputeMainSizeFromAspectRatioUsing( |
| const LayoutBox& child, |
| const Length& cross_size_length) const; |
| void SetFlowAwareLocationForChild(LayoutBox& child, const LayoutPoint&); |
| LayoutUnit ComputeInnerFlexBaseSizeForChild( |
| LayoutBox& child, |
| LayoutUnit main_axis_border_and_padding, |
| ChildLayoutType = kLayoutIfNeeded); |
| void ResetAlignmentForChild(LayoutBox& child, LayoutUnit); |
| bool MainAxisLengthIsDefinite(const LayoutBox& child, |
| const Length& flex_basis, |
| bool add_to_cb = true) const; |
| bool CrossAxisLengthIsDefinite(const LayoutBox& child, |
| const Length& flex_basis) const; |
| bool NeedToStretchChildLogicalHeight(const LayoutBox& child) const; |
| bool ChildHasIntrinsicMainAxisSize(const FlexLayoutAlgorithm&, |
| const LayoutBox& child) const; |
| EOverflow MainAxisOverflowForChild(const LayoutBox& child) const; |
| EOverflow CrossAxisOverflowForChild(const LayoutBox& child) const; |
| void CacheChildMainSize(const LayoutBox& child); |
| bool CanAvoidLayoutForNGChild(const LayoutBox& child) const; |
| |
| void LayoutFlexItems(bool relayout_children, SubtreeLayoutScope&); |
| bool HasAutoMarginsInCrossAxis(const LayoutBox& child) const; |
| void RepositionLogicalHeightDependentFlexItems( |
| FlexLayoutAlgorithm& algorithm); |
| LayoutUnit ClientLogicalBottomAfterRepositioning(); |
| |
| LayoutUnit ComputeChildMarginValue(const Length& margin); |
| void PrepareOrderIteratorAndMargins(); |
| MinMaxSizes ComputeMinAndMaxSizesForChild( |
| const FlexLayoutAlgorithm& algorithm, |
| const LayoutBox& child, |
| LayoutUnit border_and_padding) const; |
| LayoutUnit AdjustChildSizeForAspectRatioCrossAxisMinAndMax( |
| const LayoutBox& child, |
| LayoutUnit child_size) const; |
| void ConstructAndAppendFlexItem(FlexLayoutAlgorithm* algorithm, |
| LayoutBox& child, |
| ChildLayoutType); |
| |
| bool ResolveFlexibleLengths(FlexLine*, |
| LayoutUnit initial_free_space, |
| LayoutUnit& remaining_free_space); |
| |
| void ResetAutoMarginsAndLogicalTopInCrossAxis(LayoutBox& child); |
| void SetOverrideMainAxisContentSizeForChild(FlexItem&); |
| void PrepareChildForPositionedLayout(LayoutBox& child); |
| void LayoutLineItems(FlexLine*, bool relayout_children, SubtreeLayoutScope&); |
| void ApplyLineItemsPosition(FlexLine*); |
| void LayoutColumnReverse(FlexItemVectorView&, |
| LayoutUnit cross_axis_offset, |
| LayoutUnit available_free_space); |
| void AlignFlexLines(FlexLayoutAlgorithm&); |
| void AlignChildren(FlexLayoutAlgorithm&); |
| void ApplyStretchAlignmentToChild(FlexItem& child); |
| void FlipForRightToLeftColumn(const Vector<FlexLine>& line_contexts); |
| |
| float CountIntrinsicSizeForAlgorithmChange( |
| LayoutUnit max_preferred_width, |
| LayoutBox* child, |
| float previous_max_content_flex_fraction) const; |
| |
| void MergeAnonymousFlexItems(LayoutObject* remove_child); |
| |
| // This is used to cache the preferred size for orthogonal flow children so we |
| // don't have to relayout to get it |
| HashMap<const LayoutObject*, LayoutUnit> intrinsic_size_along_main_axis_; |
| |
| // This set is used to keep track of which children we laid out in this |
| // current layout iteration. We need it because the ones in this set may |
| // need an additional layout pass for correct stretch alignment handling, as |
| // the first layout likely did not use the correct value for percentage |
| // sizing of children. |
| HashSet<const LayoutObject*> relaid_out_children_; |
| |
| mutable OrderIterator order_iterator_; |
| int number_of_in_flow_children_on_first_line_; |
| |
| // This is SizeIsUnknown outside of layoutBlock() |
| mutable SizeDefiniteness has_definite_height_; |
| bool in_layout_; |
| }; |
| |
| DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFlexibleBox, IsFlexibleBox()); |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_FLEXIBLE_BOX_H_ |