tawasuyu/taffy

1#![allow(dead_code)]
2use slotmap::{DefaultKey, SlotMap};
3
4pub mod yg {
5    pub use ordered_float::OrderedFloat;
6    use slotmap::{DefaultKey, SlotMap};
7    pub use yoga::types::*;
8    pub use yoga::Node;
9
10    pub type YogaTree = SlotMap<DefaultKey, Node>;
11}
12mod tf {
13    pub use taffy::prelude::*;
14}
15
16pub fn new_default_style_with_children(
17    tree: &mut SlotMap<DefaultKey, yg::Node>,
18    children: Vec<DefaultKey>,
19) -> DefaultKey {
20    let mut node = yg::Node::new();
21    for (i, child) in children.into_iter().enumerate() {
22        node.insert_child(&mut tree[child], i as u32);
23    }
24    tree.insert(node)
25}
26
27pub fn new_with_children(
28    tree: &mut SlotMap<DefaultKey, yg::Node>,
29    style: &tf::Style,
30    children: Vec<DefaultKey>,
31) -> DefaultKey {
32    let mut node = yg::Node::new();
33    apply_taffy_style(&mut node, style);
34    for (i, child) in children.into_iter().enumerate() {
35        node.insert_child(&mut tree[child], i as u32);
36    }
37    tree.insert(node)
38}
39
40fn into_yg_units(dim: impl Into<tf::Dimension>) -> yg::StyleUnit {
41    match dim.into() {
42        tf::Dimension::Auto => yg::StyleUnit::Auto,
43        tf::Dimension::Points(val) => yg::StyleUnit::Point(yg::OrderedFloat(val)),
44        tf::Dimension::Percent(val) => yg::StyleUnit::Percent(yg::OrderedFloat(val)),
45    }
46}
47
48fn into_pixels(dim: impl Into<tf::Dimension>) -> f32 {
49    dim.into().into_option().unwrap_or(0.0)
50}
51
52fn items_into_align(align: Option<tf::AlignSelf>) -> yg::Align {
53    match align {
54        None => yg::Align::Auto,
55        Some(tf::AlignSelf::FlexStart) => yg::Align::FlexStart,
56        Some(tf::AlignSelf::FlexEnd) => yg::Align::FlexEnd,
57        Some(tf::AlignSelf::Center) => yg::Align::Center,
58        Some(tf::AlignSelf::Baseline) => yg::Align::Baseline,
59        Some(tf::AlignSelf::Stretch) => yg::Align::Stretch,
60        Some(tf::AlignSelf::Start) => unimplemented!(),
61        Some(tf::AlignSelf::End) => unimplemented!(),
62    }
63}
64
65fn content_into_align(align: Option<tf::AlignContent>) -> yg::Align {
66    match align {
67        None => yg::Align::Auto,
68        Some(tf::AlignContent::FlexStart) => yg::Align::FlexStart,
69        Some(tf::AlignContent::Start) => yg::Align::FlexStart,
70        Some(tf::AlignContent::FlexEnd) => yg::Align::FlexEnd,
71        Some(tf::AlignContent::End) => yg::Align::FlexEnd,
72        Some(tf::AlignContent::Center) => yg::Align::Center,
73        Some(tf::AlignContent::Stretch) => yg::Align::Stretch,
74        Some(tf::AlignContent::SpaceBetween) => yg::Align::SpaceBetween,
75        Some(tf::AlignContent::SpaceAround) => yg::Align::SpaceAround,
76        Some(tf::AlignContent::SpaceEvenly) => unimplemented!(),
77    }
78}
79
80fn content_into_justify(align: Option<tf::JustifyContent>) -> yg::Justify {
81    match align {
82        None => yg::Justify::FlexStart,
83        Some(tf::JustifyContent::FlexStart) => yg::Justify::FlexStart,
84        Some(tf::JustifyContent::Start) => yg::Justify::FlexStart,
85        Some(tf::JustifyContent::FlexEnd) => yg::Justify::FlexEnd,
86        Some(tf::JustifyContent::End) => yg::Justify::FlexEnd,
87        Some(tf::JustifyContent::Center) => yg::Justify::Center,
88        Some(tf::JustifyContent::SpaceBetween) => yg::Justify::SpaceBetween,
89        Some(tf::JustifyContent::SpaceAround) => yg::Justify::SpaceAround,
90        Some(tf::JustifyContent::Stretch) => unimplemented!(),
91        Some(tf::JustifyContent::SpaceEvenly) => unimplemented!(),
92    }
93}
94
95pub fn apply_taffy_style(node: &mut yg::Node, style: &tf::Style) {
96    // display
97    node.set_display(match style.display {
98        tf::Display::Flex => yg::Display::Flex,
99        tf::Display::Grid => panic!("Yoga does not support CSS Grid"),
100        tf::Display::None => yg::Display::None,
101    });
102
103    // position
104    node.set_position_type(match style.position {
105        tf::Position::Relative => yg::PositionType::Relative,
106        tf::Position::Absolute => yg::PositionType::Absolute,
107    });
108    // inset
109    node.set_position(yg::Edge::Left, into_yg_units(style.inset.left));
110    node.set_position(yg::Edge::Right, into_yg_units(style.inset.right));
111    node.set_position(yg::Edge::Top, into_yg_units(style.inset.top));
112    node.set_position(yg::Edge::Bottom, into_yg_units(style.inset.bottom));
113
114    // sizes
115    node.set_width(into_yg_units(style.size.width));
116    node.set_height(into_yg_units(style.size.height));
117    node.set_min_width(into_yg_units(style.min_size.width));
118    node.set_min_height(into_yg_units(style.min_size.height));
119    node.set_max_width(into_yg_units(style.max_size.width));
120    node.set_max_height(into_yg_units(style.max_size.height));
121
122    // aspect_ratio
123    if let Some(aspect_ratio) = style.aspect_ratio {
124        node.set_aspect_ratio(aspect_ratio);
125    }
126
127    // spacing
128    node.set_padding(yg::Edge::Left, into_yg_units(style.padding.left));
129    node.set_padding(yg::Edge::Right, into_yg_units(style.padding.right));
130    node.set_padding(yg::Edge::Top, into_yg_units(style.padding.top));
131    node.set_padding(yg::Edge::Bottom, into_yg_units(style.padding.bottom));
132    node.set_margin(yg::Edge::Left, into_yg_units(style.margin.left));
133    node.set_margin(yg::Edge::Right, into_yg_units(style.margin.right));
134    node.set_margin(yg::Edge::Top, into_yg_units(style.margin.top));
135    node.set_margin(yg::Edge::Bottom, into_yg_units(style.margin.bottom));
136    node.set_border(yg::Edge::Left, into_pixels(style.border.left));
137    node.set_border(yg::Edge::Right, into_pixels(style.border.right));
138    node.set_border(yg::Edge::Top, into_pixels(style.border.top));
139    node.set_border(yg::Edge::Bottom, into_pixels(style.border.bottom));
140
141    // alignment
142    node.set_align_items(items_into_align(style.align_items));
143    node.set_align_self(items_into_align(style.align_self));
144    node.set_align_content(content_into_align(style.align_content));
145    node.set_justify_content(content_into_justify(style.justify_content));
146
147    // gap
148    node.set_column_gap(into_pixels(style.gap.width));
149    node.set_row_gap(into_pixels(style.gap.height));
150
151    // flex
152    node.set_flex_direction(match style.flex_direction {
153        tf::FlexDirection::Row => yg::FlexDirection::Row,
154        tf::FlexDirection::Column => yg::FlexDirection::Column,
155        tf::FlexDirection::RowReverse => yg::FlexDirection::RowReverse,
156        tf::FlexDirection::ColumnReverse => yg::FlexDirection::ColumnReverse,
157    });
158    node.set_flex_wrap(match style.flex_wrap {
159        tf::FlexWrap::NoWrap => yg::Wrap::NoWrap,
160        tf::FlexWrap::Wrap => yg::Wrap::Wrap,
161        tf::FlexWrap::WrapReverse => yg::Wrap::WrapReverse,
162    });
163    node.set_flex_basis(into_yg_units(style.flex_basis));
164    node.set_flex_grow(style.flex_grow);
165    node.set_flex_shrink(style.flex_shrink);
166}