| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. |
| * All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef LayoutInline_h |
| #define LayoutInline_h |
| |
| #include "core/CoreExport.h" |
| #include "core/editing/Forward.h" |
| #include "core/layout/LayoutBoxModelObject.h" |
| #include "core/layout/api/LineLayoutItem.h" |
| #include "core/layout/line/InlineFlowBox.h" |
| #include "core/layout/line/LineBoxList.h" |
| |
| namespace blink { |
| |
| class LayoutBlockFlow; |
| |
| // LayoutInline is the LayoutObject associated with display: inline. |
| // This is called an "inline box" in CSS 2.1. |
| // http://www.w3.org/TR/CSS2/visuren.html#inline-boxes |
| // |
| // It is also the base class for content that behaves in similar way (like |
| // quotes and "display: ruby"). |
| // |
| // Note that LayoutInline is always 'inline-level' but other LayoutObject |
| // can be 'inline-level', which is why it's stored as a boolean on LayoutObject |
| // (see LayoutObject::isInline()). |
| // |
| // For performance and memory consumption, this class ignores some inline-boxes |
| // during line layout because they don't impact layout (they still exist and are |
| // inserted into the layout tree). An example of this is |
| // <span><span>Text</span></span> |
| // where the 2 spans have the same size as the inner text-node so they can be |
| // ignored for layout purpose, generating a single inline-box instead of 3. |
| // One downside of this optimization is that we have extra work to do when |
| // asking for bounding rects (see generateLineBoxRects). |
| // This optimization is called "culled inline" in the code. |
| // |
| // LayoutInlines are expected to be laid out by their containing |
| // LayoutBlockFlow. See LayoutBlockFlow::layoutInlineChildren. |
| // |
| // |
| // ***** CONTINUATIONS AND ANONYMOUS LAYOUTBLOCKFLOWS ***** |
| // LayoutInline enforces the following invariant: |
| // "All in-flow children of an inline box are inline." |
| // When a non-inline child is inserted, LayoutInline::addChild splits the inline |
| // and potentially enclosing inlines too. It then wraps layout objects into |
| // anonymous block-flow containers. This creates complexity in the code as: |
| // - a DOM node can have several associated LayoutObjects (we don't currently |
| // expose this information to the DOM code though). |
| // - more importantly, nodes that are parent/child in the DOM have no natural |
| // relationship anymore (see example below). |
| // In order to do a correct tree walk over this synthetic tree, a single linked |
| // list is stored called *continuation*. See splitFlow() about how it is |
| // populated during LayoutInline split. |
| // |
| // Continuations can only be a LayoutInline or an anonymous LayoutBlockFlow. |
| // That's why continuations are handled by LayoutBoxModelObject (common class |
| // between the 2). See LayoutBoxModelObject::continuation and setContinuation. |
| // |
| // Let's take the following example: |
| // <!DOCTYPE html> |
| // <b>Bold inline.<div>Bold block.</div>More bold inlines.</b> |
| // |
| // The generated layout tree is: |
| // LayoutBlockFlow {HTML} |
| // LayoutBlockFlow {BODY} |
| // LayoutBlockFlow (anonymous) |
| // LayoutInline {B} |
| // LayoutText {#text} |
| // text run: "Bold inline." |
| // LayoutBlockFlow (anonymous) |
| // LayoutBlockFlow {DIV} |
| // LayoutText {#text} |
| // text run: "Bold block." |
| // LayoutBlockFlow (anonymous) |
| // LayoutInline {B} |
| // LayoutText {#text} |
| // text run: "More bold inlines." |
| // |
| // The insertion of the <div> inside the <b> forces the latter to be split |
| // into 2 LayoutInlines and the insertion of anonymous LayoutBlockFlows. The 2 |
| // LayoutInlines are done so that we can apply the correct (bold) style to both |
| // sides of the <div>. The continuation chain starts with the first |
| // LayoutInline {B}, continues to the middle anonymous LayoutBlockFlow and |
| // finishes with the last LayoutInline {B}. |
| // |
| // Note that the middle anonymous LayoutBlockFlow duplicates the content. |
| // TODO(jchaffraix): Find out why we made the decision to always insert the |
| // anonymous LayoutBlockFlows. |
| // |
| // This section was inspired by an older article by Dave Hyatt: |
| // https://www.webkit.org/blog/115/webcore-rendering-ii-blocks-and-inlines/ |
| class CORE_EXPORT LayoutInline : public LayoutBoxModelObject { |
| public: |
| explicit LayoutInline(Element*); |
| |
| static LayoutInline* CreateAnonymous(Document*); |
| |
| LayoutObject* FirstChild() const { |
| DCHECK_EQ(Children(), VirtualChildren()); |
| return Children()->FirstChild(); |
| } |
| LayoutObject* LastChild() const { |
| DCHECK_EQ(Children(), VirtualChildren()); |
| return Children()->LastChild(); |
| } |
| |
| // If you have a LayoutInline, use firstChild or lastChild instead. |
| void SlowFirstChild() const = delete; |
| void SlowLastChild() const = delete; |
| |
| void AddChild(LayoutObject* new_child, |
| LayoutObject* before_child = nullptr) override; |
| |
| Element* GetNode() const { |
| return ToElement(LayoutBoxModelObject::GetNode()); |
| } |
| |
| LayoutUnit MarginLeft() const final; |
| LayoutUnit MarginRight() const final; |
| LayoutUnit MarginTop() const final; |
| LayoutUnit MarginBottom() const final; |
| |
| void AbsoluteRects(Vector<IntRect>&, |
| const LayoutPoint& accumulated_offset) const final; |
| FloatRect LocalBoundingBoxRectForAccessibility() const final; |
| |
| LayoutSize OffsetFromContainer(const LayoutObject*) const final; |
| |
| LayoutRect LinesBoundingBox() const; |
| LayoutRect VisualOverflowRect() const final; |
| |
| InlineFlowBox* CreateAndAppendInlineFlowBox(); |
| |
| void DirtyLineBoxes(bool full_layout); |
| |
| LineBoxList* LineBoxes() { return &line_boxes_; } |
| const LineBoxList* LineBoxes() const { return &line_boxes_; } |
| |
| InlineFlowBox* FirstLineBox() const { return line_boxes_.FirstLineBox(); } |
| InlineFlowBox* LastLineBox() const { return line_boxes_.LastLineBox(); } |
| InlineBox* FirstLineBoxIncludingCulling() const { |
| return AlwaysCreateLineBoxes() ? FirstLineBox() |
| : CulledInlineFirstLineBox(); |
| } |
| InlineBox* LastLineBoxIncludingCulling() const { |
| return AlwaysCreateLineBoxes() ? LastLineBox() : CulledInlineLastLineBox(); |
| } |
| |
| LayoutBoxModelObject* VirtualContinuation() const final { |
| return Continuation(); |
| } |
| LayoutInline* InlineElementContinuation() const; |
| |
| LayoutSize OffsetForInFlowPositionedInline(const LayoutBox& child) const; |
| |
| void AddOutlineRects(Vector<LayoutRect>&, |
| const LayoutPoint& additional_offset, |
| IncludeBlockVisualOverflowOrNot) const final; |
| // The following methods are called from the container if it has already added |
| // outline rects for line boxes and/or children of this LayoutInline. |
| void AddOutlineRectsForChildrenAndContinuations( |
| Vector<LayoutRect>&, |
| const LayoutPoint& additional_offset, |
| IncludeBlockVisualOverflowOrNot) const; |
| void AddOutlineRectsForContinuations(Vector<LayoutRect>&, |
| const LayoutPoint& additional_offset, |
| IncludeBlockVisualOverflowOrNot) const; |
| |
| using LayoutBoxModelObject::Continuation; |
| using LayoutBoxModelObject::SetContinuation; |
| |
| bool AlwaysCreateLineBoxes() const { |
| return AlwaysCreateLineBoxesForLayoutInline(); |
| } |
| void SetAlwaysCreateLineBoxes(bool always_create_line_boxes = true) { |
| SetAlwaysCreateLineBoxesForLayoutInline(always_create_line_boxes); |
| } |
| void UpdateAlwaysCreateLineBoxes(bool full_layout); |
| |
| LayoutRect LocalCaretRect(const InlineBox*, |
| int, |
| LayoutUnit* extra_width_to_end_of_line) const final; |
| |
| bool HitTestCulledInline(HitTestResult&, |
| const HitTestLocation& location_in_container, |
| const LayoutPoint& accumulated_offset); |
| |
| LayoutPoint FirstLineBoxTopLeft() const; |
| |
| const char* GetName() const override { return "LayoutInline"; } |
| |
| LayoutRect DebugRect() const override; |
| |
| protected: |
| void WillBeDestroyed() override; |
| |
| void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override; |
| |
| void ComputeSelfHitTestRects(Vector<LayoutRect>& rects, |
| const LayoutPoint& layer_offset) const override; |
| |
| void InvalidateDisplayItemClients(PaintInvalidationReason) const override; |
| |
| void AbsoluteQuadsForSelf(Vector<FloatQuad>& quads, |
| MapCoordinatesFlags mode = 0) const override; |
| |
| private: |
| LayoutObjectChildList* VirtualChildren() final { return Children(); } |
| const LayoutObjectChildList* VirtualChildren() const final { |
| return Children(); |
| } |
| const LayoutObjectChildList* Children() const { return &children_; } |
| LayoutObjectChildList* Children() { return &children_; } |
| |
| bool IsLayoutInline() const final { return true; } |
| |
| LayoutRect CulledInlineVisualOverflowBoundingBox() const; |
| InlineBox* CulledInlineFirstLineBox() const; |
| InlineBox* CulledInlineLastLineBox() const; |
| |
| // For visualOverflowRect() only, to get bounding box of visual overflow of |
| // line boxes. |
| LayoutRect LinesVisualOverflowBoundingBox() const; |
| |
| template <typename GeneratorContext> |
| void GenerateLineBoxRects(GeneratorContext& yield) const; |
| template <typename GeneratorContext> |
| void GenerateCulledLineBoxRects(GeneratorContext& yield, |
| const LayoutInline* container) const; |
| |
| void AddChildToContinuation(LayoutObject* new_child, |
| LayoutObject* before_child); |
| void AddChildIgnoringContinuation(LayoutObject* new_child, |
| LayoutObject* before_child = nullptr) final; |
| |
| void MoveChildrenToIgnoringContinuation(LayoutInline* to, |
| LayoutObject* start_child); |
| |
| void SplitInlines(LayoutBlockFlow* from_block, |
| LayoutBlockFlow* to_block, |
| LayoutBlockFlow* middle_block, |
| LayoutObject* before_child, |
| LayoutBoxModelObject* old_cont); |
| void SplitFlow(LayoutObject* before_child, |
| LayoutBlockFlow* new_block_box, |
| LayoutObject* new_child, |
| LayoutBoxModelObject* old_cont); |
| |
| void UpdateLayout() final { NOTREACHED(); } // Do nothing for layout() |
| |
| void Paint(const PaintInfo&, const LayoutPoint&) const final; |
| |
| bool NodeAtPoint(HitTestResult&, |
| const HitTestLocation& location_in_container, |
| const LayoutPoint& accumulated_offset, |
| HitTestAction) final; |
| |
| PaintLayerType LayerTypeRequired() const override; |
| |
| LayoutUnit OffsetLeft(const Element*) const final; |
| LayoutUnit OffsetTop(const Element*) const final; |
| LayoutUnit OffsetWidth() const final { return LinesBoundingBox().Width(); } |
| LayoutUnit OffsetHeight() const final { return LinesBoundingBox().Height(); } |
| |
| LayoutRect AbsoluteVisualRect() const override; |
| |
| // This method differs from visualOverflowRect in that it doesn't include the |
| // rects for culled inline boxes, which aren't necessary for paint |
| // invalidation. |
| LayoutRect LocalVisualRectIgnoringVisibility() const override; |
| |
| bool MapToVisualRectInAncestorSpaceInternal( |
| const LayoutBoxModelObject* ancestor, |
| TransformState&, |
| VisualRectFlags = kDefaultVisualRectFlags) const final; |
| |
| PositionWithAffinity PositionForPoint(const LayoutPoint&) final; |
| |
| IntRect BorderBoundingBox() const final { |
| IntRect bounding_box = EnclosingIntRect(LinesBoundingBox()); |
| return IntRect(0, 0, bounding_box.Width(), bounding_box.Height()); |
| } |
| |
| virtual InlineFlowBox* CreateInlineFlowBox(); // Subclassed by SVG and Ruby |
| |
| void DirtyLinesFromChangedChild(LayoutObject*, MarkingBehavior) final; |
| |
| // TODO(leviw): This should probably be an int. We don't snap equivalent lines |
| // to different heights. |
| LayoutUnit LineHeight( |
| bool first_line, |
| LineDirectionMode, |
| LinePositionMode = kPositionOnContainingLine) const final; |
| LayoutUnit BaselinePosition( |
| FontBaseline, |
| bool first_line, |
| LineDirectionMode, |
| LinePositionMode = kPositionOnContainingLine) const final; |
| |
| void ChildBecameNonInline(LayoutObject* child) final; |
| |
| void UpdateHitTestResult(HitTestResult&, const LayoutPoint&) final; |
| |
| void ImageChanged(WrappedImagePtr, |
| CanDeferInvalidation, |
| const IntRect* = nullptr) final; |
| |
| void AddAnnotatedRegions(Vector<AnnotatedRegionValue>&) final; |
| |
| void UpdateFromStyle() final; |
| |
| LayoutInline* Clone() const; |
| |
| LayoutBoxModelObject* ContinuationBefore(LayoutObject* before_child); |
| |
| LayoutObjectChildList children_; |
| // All of the line boxes created for this inline flow. For example, |
| // <i>Hello<br>world.</i> will have two <i> line boxes. |
| LineBoxList line_boxes_; |
| }; |
| |
| DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutInline, IsLayoutInline()); |
| |
| } // namespace blink |
| |
| #endif // LayoutInline_h |