layout/taffy/
mod.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4mod layout;
5mod stylo_taffy;
6use std::fmt;
7
8use app_units::Au;
9use malloc_size_of_derive::MallocSizeOf;
10use script::layout_dom::ServoThreadSafeLayoutNode;
11use servo_arc::Arc;
12use style::context::SharedStyleContext;
13use style::properties::ComputedValues;
14use stylo_taffy::TaffyStyloStyle;
15
16use crate::PropagatedBoxTreeData;
17use crate::cell::ArcRefCell;
18use crate::construct_modern::{ModernContainerBuilder, ModernItemKind};
19use crate::context::LayoutContext;
20use crate::dom::{LayoutBox, WeakLayoutBox};
21use crate::dom_traversal::{NodeAndStyleInfo, NonReplacedContents};
22use crate::formatting_contexts::IndependentFormattingContext;
23use crate::fragment_tree::Fragment;
24use crate::layout_box_base::LayoutBoxBase;
25use crate::positioned::{AbsolutelyPositionedBox, PositioningContext};
26
27#[derive(Debug, MallocSizeOf)]
28pub(crate) struct TaffyContainer {
29    children: Vec<ArcRefCell<TaffyItemBox>>,
30    style: Arc<ComputedValues>,
31}
32
33impl TaffyContainer {
34    pub fn construct(
35        context: &LayoutContext,
36        info: &NodeAndStyleInfo,
37        contents: NonReplacedContents,
38        propagated_data: PropagatedBoxTreeData,
39    ) -> Self {
40        let mut builder = ModernContainerBuilder::new(context, info, propagated_data);
41        contents.traverse(context, info, &mut builder);
42        let items = builder.finish();
43
44        let children = items
45            .into_iter()
46            .map(|item| {
47                let taffy_item_box = match item.kind {
48                    ModernItemKind::InFlow(independent_formatting_context) => {
49                        ArcRefCell::new(TaffyItemBox::new(TaffyItemBoxInner::InFlowBox(
50                            independent_formatting_context,
51                        )))
52                    },
53                    ModernItemKind::OutOfFlow(independent_formatting_context) => {
54                        let abs_pos_box = ArcRefCell::new(AbsolutelyPositionedBox::new(
55                            independent_formatting_context,
56                        ));
57                        ArcRefCell::new(TaffyItemBox::new(
58                            TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(abs_pos_box),
59                        ))
60                    },
61                    ModernItemKind::ReusedBox(layout_box) => match layout_box {
62                        LayoutBox::TaffyItemBox(taffy_item_box) => taffy_item_box,
63                        _ => unreachable!("Undamaged taffy level element should be associated with taffy level box"),
64                    },
65                };
66
67                item.box_slot.set(LayoutBox::TaffyItemBox(taffy_item_box.clone()));
68                taffy_item_box
69            })
70            .collect();
71
72        Self {
73            children,
74            style: info.style.clone(),
75        }
76    }
77
78    pub(crate) fn repair_style(&mut self, new_style: &Arc<ComputedValues>) {
79        self.style = new_style.clone();
80    }
81}
82
83#[derive(MallocSizeOf)]
84pub(crate) struct TaffyItemBox {
85    pub(crate) taffy_layout: taffy::Layout,
86    pub(crate) child_fragments: Vec<Fragment>,
87    pub(crate) positioning_context: PositioningContext,
88    pub(crate) style: Arc<ComputedValues>,
89    pub(crate) taffy_level_box: TaffyItemBoxInner,
90}
91
92#[expect(clippy::large_enum_variant)]
93#[derive(Debug, MallocSizeOf)]
94pub(crate) enum TaffyItemBoxInner {
95    InFlowBox(IndependentFormattingContext),
96    OutOfFlowAbsolutelyPositionedBox(ArcRefCell<AbsolutelyPositionedBox>),
97}
98
99impl fmt::Debug for TaffyItemBox {
100    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
101        f.debug_struct("TaffyItemBox")
102            .field("taffy_layout", &self.taffy_layout)
103            .field("child_fragments", &self.child_fragments.len())
104            .field("style", &self.style)
105            .field("taffy_level_box", &self.taffy_level_box)
106            .finish()
107    }
108}
109
110impl TaffyItemBox {
111    fn new(inner: TaffyItemBoxInner) -> Self {
112        let style: Arc<ComputedValues> = match &inner {
113            TaffyItemBoxInner::InFlowBox(item) => item.style().clone(),
114            TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(absbox) => {
115                (*absbox).borrow().context.style().clone()
116            },
117        };
118
119        Self {
120            taffy_layout: Default::default(),
121            child_fragments: Vec::new(),
122            positioning_context: PositioningContext::default(),
123            style,
124            taffy_level_box: inner,
125        }
126    }
127
128    pub(crate) fn with_base<T>(&self, callback: impl FnOnce(&LayoutBoxBase) -> T) -> T {
129        match self.taffy_level_box {
130            TaffyItemBoxInner::InFlowBox(ref independent_formatting_context) => {
131                callback(&independent_formatting_context.base)
132            },
133            TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(ref positioned_box) => {
134                callback(&positioned_box.borrow().context.base)
135            },
136        }
137    }
138
139    pub(crate) fn with_base_mut<T>(&mut self, callback: impl FnOnce(&mut LayoutBoxBase) -> T) -> T {
140        match &mut self.taffy_level_box {
141            TaffyItemBoxInner::InFlowBox(independent_formatting_context) => {
142                callback(&mut independent_formatting_context.base)
143            },
144            TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(positioned_box) => {
145                callback(&mut positioned_box.borrow_mut().context.base)
146            },
147        }
148    }
149
150    pub(crate) fn repair_style(
151        &mut self,
152        context: &SharedStyleContext,
153        node: &ServoThreadSafeLayoutNode,
154        new_style: &Arc<ComputedValues>,
155    ) {
156        self.style = new_style.clone();
157        match &mut self.taffy_level_box {
158            TaffyItemBoxInner::InFlowBox(independent_formatting_context) => {
159                independent_formatting_context.repair_style(context, node, new_style)
160            },
161            TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(positioned_box) => positioned_box
162                .borrow_mut()
163                .context
164                .repair_style(context, node, new_style),
165        }
166    }
167
168    fn is_in_flow_replaced(&self) -> bool {
169        match &self.taffy_level_box {
170            TaffyItemBoxInner::InFlowBox(fc) => fc.is_replaced(),
171            TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(_) => false,
172        }
173    }
174
175    pub(crate) fn attached_to_tree(&self, layout_box: WeakLayoutBox) {
176        match &self.taffy_level_box {
177            TaffyItemBoxInner::InFlowBox(formatting_context) => {
178                formatting_context.attached_to_tree(layout_box)
179            },
180            TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(positioned_box) => positioned_box
181                .borrow_mut()
182                .context
183                .attached_to_tree(layout_box),
184        }
185    }
186}
187
188/// Details from Taffy grid layout that will be stored
189#[derive(Clone, Debug, MallocSizeOf)]
190pub(crate) struct SpecificTaffyGridInfo {
191    pub rows: SpecificTaffyGridTrackInfo,
192    pub columns: SpecificTaffyGridTrackInfo,
193}
194
195impl SpecificTaffyGridInfo {
196    fn from_detailed_grid_layout(grid_info: taffy::DetailedGridInfo) -> Self {
197        Self {
198            rows: SpecificTaffyGridTrackInfo {
199                sizes: grid_info
200                    .rows
201                    .sizes
202                    .iter()
203                    .map(|size| Au::from_f32_px(*size))
204                    .collect(),
205            },
206            columns: SpecificTaffyGridTrackInfo {
207                sizes: grid_info
208                    .columns
209                    .sizes
210                    .iter()
211                    .map(|size| Au::from_f32_px(*size))
212                    .collect(),
213            },
214        }
215    }
216}
217
218#[derive(Clone, Debug, MallocSizeOf)]
219pub(crate) struct SpecificTaffyGridTrackInfo {
220    pub sizes: Box<[Au]>,
221}
layout/taffy/mod.rs

layout/taffy/
mod.rs
