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slint/internal/core/layout.rs
Olivier Goffart 23962b3e25
Upgrade cbindgen and use unsafe(no_mangle) attributes (#8539) 
To be compatible with the 2024 edition, we need to wrap the
`no_mangle` attribute in `unsafe()`.

The parsing for that in cbindgen was only added in the version 0.28,
but we couldn't upgrade cbindgen before because of a regression in
cbindgen 0.27 that prevented us from upgrading.
Now that cbindgen 0.29 is released with a fix, we can prepare for the
2024 edition
2025-05-26 11:21:33 +02:00

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// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0
//! Runtime support for layouts.
// cspell:ignore coord
use crate::items::{DialogButtonRole, LayoutAlignment};
use crate::{slice::Slice, Coord, SharedVector};
use alloc::vec::Vec;
pub use crate::items::Orientation;
/// The constraint that applies to an item
// Also, the field needs to be in alphabetical order because how the generated code sort fields for struct
#[repr(C)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct LayoutInfo {
/// The maximum size for the item.
pub max: Coord,
/// The maximum size in percentage of the parent (value between 0 and 100).
pub max_percent: Coord,
/// The minimum size for this item.
pub min: Coord,
/// The minimum size in percentage of the parent (value between 0 and 100).
pub min_percent: Coord,
/// the preferred size
pub preferred: Coord,
/// the stretch factor
pub stretch: f32,
}
impl Default for LayoutInfo {
fn default() -> Self {
LayoutInfo {
min: 0 as _,
max: Coord::MAX,
min_percent: 0 as _,
max_percent: 100 as _,
preferred: 0 as _,
stretch: 0 as _,
}
}
}
impl LayoutInfo {
// Note: This "logic" is duplicated in the cpp generator's generated code for merging layout infos.
#[must_use]
pub fn merge(&self, other: &LayoutInfo) -> Self {
Self {
min: self.min.max(other.min),
max: self.max.min(other.max),
min_percent: self.min_percent.max(other.min_percent),
max_percent: self.max_percent.min(other.max_percent),
preferred: self.preferred.max(other.preferred),
stretch: self.stretch.min(other.stretch),
}
}
/// Helper function to return a preferred size which is within the min/max constraints
#[must_use]
pub fn preferred_bounded(&self) -> Coord {
self.preferred.min(self.max).max(self.min)
}
}
impl core::ops::Add for LayoutInfo {
type Output = Self;
fn add(self, rhs: Self) -> Self::Output {
self.merge(&rhs)
}
}
/// Returns the logical min and max sizes given the provided layout constraints.
pub fn min_max_size_for_layout_constraints(
constraints_horizontal: LayoutInfo,
constraints_vertical: LayoutInfo,
) -> (Option<crate::api::LogicalSize>, Option<crate::api::LogicalSize>) {
let min_width = constraints_horizontal.min.min(constraints_horizontal.max) as f32;
let min_height = constraints_vertical.min.min(constraints_vertical.max) as f32;
let max_width = constraints_horizontal.max.max(constraints_horizontal.min) as f32;
let max_height = constraints_vertical.max.max(constraints_vertical.min) as f32;
//cfg!(target_arch = "wasm32") is there because wasm32 winit don't like when max size is None:
// panicked at 'Property is read only: JsValue(NoModificationAllowedError: CSSStyleDeclaration.removeProperty: Can't remove property 'max-width' from computed style
let min_size = if min_width > 0. || min_height > 0. || cfg!(target_arch = "wasm32") {
Some(crate::api::LogicalSize::new(min_width, min_height))
} else {
None
};
let max_size = if (max_width > 0.
&& max_height > 0.
&& (max_width < i32::MAX as f32 || max_height < i32::MAX as f32))
|| cfg!(target_arch = "wasm32")
{
// maximum widget size for Qt and a workaround for the winit api not allowing partial constraints
let window_size_max = 16_777_215.;
Some(crate::api::LogicalSize::new(
max_width.min(window_size_max),
max_height.min(window_size_max),
))
} else {
None
};
(min_size, max_size)
}
/// Implement a saturating_add version for both possible value of Coord.
/// So that adding the max value does not overflow
trait Saturating {
fn add(_: Self, _: Self) -> Self;
}
impl Saturating for i32 {
#[inline]
fn add(a: Self, b: Self) -> Self {
a.saturating_add(b)
}
}
impl Saturating for f32 {
#[inline]
fn add(a: Self, b: Self) -> Self {
a + b
}
}
mod grid_internal {
use super::*;
fn order_coord<T: PartialOrd>(a: &T, b: &T) -> core::cmp::Ordering {
a.partial_cmp(b).unwrap_or(core::cmp::Ordering::Equal)
}
#[derive(Debug, Clone)]
pub struct LayoutData {
// inputs
pub min: Coord,
pub max: Coord,
pub pref: Coord,
pub stretch: f32,
// outputs
pub pos: Coord,
pub size: Coord,
}
impl Default for LayoutData {
fn default() -> Self {
LayoutData {
min: 0 as _,
max: Coord::MAX,
pref: 0 as _,
stretch: f32::MAX,
pos: 0 as _,
size: 0 as _,
}
}
}
trait Adjust {
fn can_grow(_: &LayoutData) -> Coord;
fn to_distribute(expected_size: Coord, current_size: Coord) -> Coord;
fn distribute(_: &mut LayoutData, val: Coord);
}
struct Grow;
impl Adjust for Grow {
fn can_grow(it: &LayoutData) -> Coord {
it.max - it.size
}
fn to_distribute(expected_size: Coord, current_size: Coord) -> Coord {
expected_size - current_size
}
fn distribute(it: &mut LayoutData, val: Coord) {
it.size += val;
}
}
struct Shrink;
impl Adjust for Shrink {
fn can_grow(it: &LayoutData) -> Coord {
it.size - it.min
}
fn to_distribute(expected_size: Coord, current_size: Coord) -> Coord {
current_size - expected_size
}
fn distribute(it: &mut LayoutData, val: Coord) {
it.size -= val;
}
}
#[allow(clippy::unnecessary_cast)] // Coord
fn adjust_items<A: Adjust>(data: &mut [LayoutData], size_without_spacing: Coord) -> Option<()> {
loop {
let size_cannot_grow: Coord = data
.iter()
.filter(|it| A::can_grow(it) <= 0 as _)
.map(|it| it.size)
.fold(0 as Coord, Saturating::add);
let total_stretch: f32 =
data.iter().filter(|it| A::can_grow(it) > 0 as _).map(|it| it.stretch).sum();
let actual_stretch = |s: f32| if total_stretch <= 0. { 1. } else { s };
let max_grow = data
.iter()
.filter(|it| A::can_grow(it) > 0 as _)
.map(|it| A::can_grow(it) as f32 / actual_stretch(it.stretch))
.min_by(order_coord)?;
let current_size: Coord = data
.iter()
.filter(|it| A::can_grow(it) > 0 as _)
.map(|it| it.size)
.fold(0 as _, Saturating::add);
//let to_distribute = size_without_spacing - (size_cannot_grow + current_size);
let to_distribute =
A::to_distribute(size_without_spacing, size_cannot_grow + current_size) as f32;
if to_distribute <= 0. || max_grow <= 0. {
return Some(());
}
let grow = if total_stretch <= 0. {
to_distribute
/ (data.iter().filter(|it| A::can_grow(it) > 0 as _).count() as Coord) as f32
} else {
to_distribute / total_stretch
}
.min(max_grow);
let mut distributed = 0 as Coord;
for it in data.iter_mut().filter(|it| A::can_grow(it) > 0 as Coord) {
let val = (grow * actual_stretch(it.stretch)) as Coord;
A::distribute(it, val);
distributed += val;
}
if distributed <= 0 as Coord {
// This can happen when Coord is integer and there is less then a pixel to add to each elements
// just give the pixel to the one with the bigger stretch
if let Some(it) = data
.iter_mut()
.filter(|it| A::can_grow(it) > 0 as _)
.max_by(|a, b| actual_stretch(a.stretch).total_cmp(&b.stretch))
{
A::distribute(it, to_distribute as Coord);
}
return Some(());
}
}
}
pub fn layout_items(data: &mut [LayoutData], start_pos: Coord, size: Coord, spacing: Coord) {
let size_without_spacing = size - spacing * (data.len() - 1) as Coord;
let mut pref = 0 as Coord;
for it in data.iter_mut() {
it.size = it.pref;
pref += it.pref;
}
if size_without_spacing >= pref {
adjust_items::<Grow>(data, size_without_spacing);
} else if size_without_spacing < pref {
adjust_items::<Shrink>(data, size_without_spacing);
}
let mut pos = start_pos;
for it in data.iter_mut() {
it.pos = pos;
pos = Saturating::add(pos, Saturating::add(it.size, spacing));
}
}
#[test]
#[allow(clippy::float_cmp)] // We want bit-wise equality here
fn test_layout_items() {
let my_items = &mut [
LayoutData { min: 100., max: 200., pref: 100., stretch: 1., ..Default::default() },
LayoutData { min: 50., max: 300., pref: 100., stretch: 1., ..Default::default() },
LayoutData { min: 50., max: 150., pref: 100., stretch: 1., ..Default::default() },
];
layout_items(my_items, 100., 650., 0.);
assert_eq!(my_items[0].size, 200.);
assert_eq!(my_items[1].size, 300.);
assert_eq!(my_items[2].size, 150.);
layout_items(my_items, 100., 200., 0.);
assert_eq!(my_items[0].size, 100.);
assert_eq!(my_items[1].size, 50.);
assert_eq!(my_items[2].size, 50.);
layout_items(my_items, 100., 300., 0.);
assert_eq!(my_items[0].size, 100.);
assert_eq!(my_items[1].size, 100.);
assert_eq!(my_items[2].size, 100.);
}
/// Create a vector of LayoutData for an array of GridLayoutCellData
pub fn to_layout_data(
data: &[GridLayoutCellData],
spacing: Coord,
size: Option<Coord>,
) -> Vec<LayoutData> {
let mut num = 0usize;
for cell in data {
num = num.max(cell.col_or_row as usize + cell.span.max(1) as usize);
}
if num < 1 {
return Default::default();
}
let mut layout_data =
alloc::vec![grid_internal::LayoutData { stretch: 1., ..Default::default() }; num];
let mut has_spans = false;
for cell in data {
let constraint = &cell.constraint;
let mut max = constraint.max;
if let Some(size) = size {
max = max.min(size * constraint.max_percent / 100 as Coord);
}
for c in 0..(cell.span as usize) {
let cdata = &mut layout_data[cell.col_or_row as usize + c];
cdata.max = cdata.max.min(max);
}
if cell.span == 1 {
let mut min = constraint.min;
if let Some(size) = size {
min = min.max(size * constraint.min_percent / 100 as Coord);
}
let pref = constraint.preferred.min(max).max(min);
let cdata = &mut layout_data[cell.col_or_row as usize];
cdata.min = cdata.min.max(min);
cdata.pref = cdata.pref.max(pref);
cdata.stretch = cdata.stretch.min(constraint.stretch);
} else {
has_spans = true;
}
}
if has_spans {
// Adjust minimum sizes
for cell in data.iter().filter(|cell| cell.span > 1) {
let span_data = &mut layout_data
[(cell.col_or_row as usize)..(cell.col_or_row + cell.span) as usize];
let mut min = cell.constraint.min;
if let Some(size) = size {
min = min.max(size * cell.constraint.min_percent / 100 as Coord);
}
grid_internal::layout_items(span_data, 0 as _, min, spacing);
for cdata in span_data {
if cdata.min < cdata.size {
cdata.min = cdata.size;
}
}
}
// Adjust maximum sizes
for cell in data.iter().filter(|cell| cell.span > 1) {
let span_data = &mut layout_data
[(cell.col_or_row as usize)..(cell.col_or_row + cell.span) as usize];
let mut max = cell.constraint.max;
if let Some(size) = size {
max = max.min(size * cell.constraint.max_percent / 100 as Coord);
}
grid_internal::layout_items(span_data, 0 as _, max, spacing);
for cdata in span_data {
if cdata.max > cdata.size {
cdata.max = cdata.size;
}
}
}
// Adjust preferred sizes
for cell in data.iter().filter(|cell| cell.span > 1) {
let span_data = &mut layout_data
[(cell.col_or_row as usize)..(cell.col_or_row + cell.span) as usize];
grid_internal::layout_items(span_data, 0 as _, cell.constraint.preferred, spacing);
for cdata in span_data {
cdata.pref = cdata.pref.max(cdata.size).min(cdata.max).max(cdata.min);
}
}
// Adjust stretches
for cell in data.iter().filter(|cell| cell.span > 1) {
let span_data = &mut layout_data
[(cell.col_or_row as usize)..(cell.col_or_row + cell.span) as usize];
let total_stretch: f32 = span_data.iter().map(|c| c.stretch).sum();
if total_stretch > cell.constraint.stretch {
for cdata in span_data {
cdata.stretch *= cell.constraint.stretch / total_stretch;
}
}
}
}
layout_data
}
}
#[repr(C)]
pub struct Constraint {
pub min: Coord,
pub max: Coord,
}
impl Default for Constraint {
fn default() -> Self {
Constraint { min: 0 as Coord, max: Coord::MAX }
}
}
#[repr(C)]
#[derive(Copy, Clone, Debug, Default)]
pub struct Padding {
pub begin: Coord,
pub end: Coord,
}
#[repr(C)]
#[derive(Debug)]
pub struct GridLayoutData<'a> {
pub size: Coord,
pub spacing: Coord,
pub padding: Padding,
pub cells: Slice<'a, GridLayoutCellData>,
}
#[repr(C)]
#[derive(Default, Debug)]
pub struct GridLayoutCellData {
/// col, or row.
pub col_or_row: u16,
/// colspan or rowspan
pub span: u16,
pub constraint: LayoutInfo,
}
/// return, an array which is of size `data.cells.len() * 2` which for each cell we give the pos, size
pub fn solve_grid_layout(data: &GridLayoutData) -> SharedVector<Coord> {
let mut layout_data =
grid_internal::to_layout_data(data.cells.as_slice(), data.spacing, Some(data.size));
if layout_data.is_empty() {
return Default::default();
}
grid_internal::layout_items(
&mut layout_data,
data.padding.begin,
data.size - (data.padding.begin + data.padding.end),
data.spacing,
);
let mut result = SharedVector::with_capacity(4 * data.cells.len());
for cell in data.cells.iter() {
let cdata = &layout_data[cell.col_or_row as usize];
result.push(cdata.pos);
result.push(if cell.span > 0 {
let first_cell = &layout_data[cell.col_or_row as usize];
let last_cell = &layout_data[cell.col_or_row as usize + cell.span as usize - 1];
last_cell.pos + last_cell.size - first_cell.pos
} else {
0 as Coord
});
}
result
}
pub fn grid_layout_info(
cells: Slice<GridLayoutCellData>,
spacing: Coord,
padding: &Padding,
) -> LayoutInfo {
let layout_data = grid_internal::to_layout_data(cells.as_slice(), spacing, None);
if layout_data.is_empty() {
return Default::default();
}
let spacing_w = spacing * (layout_data.len() - 1) as Coord + padding.begin + padding.end;
let min = layout_data.iter().map(|data| data.min).sum::<Coord>() + spacing_w;
let max = layout_data.iter().map(|data| data.max).fold(spacing_w, Saturating::add);
let preferred = layout_data.iter().map(|data| data.pref).sum::<Coord>() + spacing_w;
let stretch = layout_data.iter().map(|data| data.stretch).sum::<f32>();
LayoutInfo { min, max, min_percent: 0 as _, max_percent: 100 as _, preferred, stretch }
}
#[repr(C)]
#[derive(Debug)]
/// The BoxLayoutData is used to represent both a Horizontal and Vertical layout.
/// The width/height x/y correspond to that of a horizontal layout.
/// For vertical layout, they are inverted
pub struct BoxLayoutData<'a> {
pub size: Coord,
pub spacing: Coord,
pub padding: Padding,
pub alignment: LayoutAlignment,
pub cells: Slice<'a, BoxLayoutCellData>,
}
#[repr(C)]
#[derive(Default, Debug, Clone)]
pub struct BoxLayoutCellData {
pub constraint: LayoutInfo,
}
/// Solve a BoxLayout
pub fn solve_box_layout(data: &BoxLayoutData, repeater_indexes: Slice<u32>) -> SharedVector<Coord> {
let mut result = SharedVector::<Coord>::default();
result.resize(data.cells.len() * 2 + repeater_indexes.len(), 0 as _);
if data.cells.is_empty() {
return result;
}
let mut layout_data: Vec<_> = data
.cells
.iter()
.map(|c| {
let min = c.constraint.min.max(c.constraint.min_percent * data.size / 100 as Coord);
let max = c.constraint.max.min(c.constraint.max_percent * data.size / 100 as Coord);
grid_internal::LayoutData {
min,
max,
pref: c.constraint.preferred.min(max).max(min),
stretch: c.constraint.stretch,
..Default::default()
}
})
.collect();
let size_without_padding = data.size - data.padding.begin - data.padding.end;
let pref_size: Coord = layout_data.iter().map(|it| it.pref).sum();
let num_spacings = (layout_data.len() - 1) as Coord;
let spacings = data.spacing * num_spacings;
let align = match data.alignment {
LayoutAlignment::Stretch => {
grid_internal::layout_items(
&mut layout_data,
data.padding.begin,
size_without_padding,
data.spacing,
);
None
}
_ if size_without_padding <= pref_size + spacings => {
grid_internal::layout_items(
&mut layout_data,
data.padding.begin,
size_without_padding,
data.spacing,
);
None
}
LayoutAlignment::Center => Some((
data.padding.begin + (size_without_padding - pref_size - spacings) / 2 as Coord,
data.spacing,
)),
LayoutAlignment::Start => Some((data.padding.begin, data.spacing)),
LayoutAlignment::End => {
Some((data.padding.begin + (size_without_padding - pref_size - spacings), data.spacing))
}
LayoutAlignment::SpaceBetween => {
Some((data.padding.begin, (size_without_padding - pref_size) / num_spacings))
}
LayoutAlignment::SpaceAround => {
let spacing = (size_without_padding - pref_size) / (num_spacings + 1 as Coord);
Some((data.padding.begin + spacing / 2 as Coord, spacing))
}
};
if let Some((mut pos, spacing)) = align {
for it in &mut layout_data {
it.pos = pos;
it.size = it.pref;
pos += spacing + it.size;
}
}
let res = result.make_mut_slice();
// The index/2 in result in which we should add the next repeated item
let mut repeat_offset =
res.len() / 2 - repeater_indexes.iter().skip(1).step_by(2).sum::<u32>() as usize;
// The index/2 in repeater_indexes
let mut next_rep = 0;
// The index/2 in result in which we should add the next non-repeated item
let mut current_offset = 0;
for (idx, layout) in layout_data.iter().enumerate() {
let o = loop {
if let Some(nr) = repeater_indexes.get(next_rep * 2) {
let nr = *nr as usize;
if nr == idx {
for o in 0..2 {
res[current_offset * 2 + o] = (repeat_offset * 2 + o) as _;
}
current_offset += 1;
}
if idx >= nr {
if idx - nr == repeater_indexes[next_rep * 2 + 1] as usize {
next_rep += 1;
continue;
}
repeat_offset += 1;
break repeat_offset - 1;
}
}
current_offset += 1;
break current_offset - 1;
};
res[o * 2] = layout.pos;
res[o * 2 + 1] = layout.size;
}
result
}
/// Return the LayoutInfo for a BoxLayout with the given cells.
pub fn box_layout_info(
cells: Slice<BoxLayoutCellData>,
spacing: Coord,
padding: &Padding,
alignment: LayoutAlignment,
) -> LayoutInfo {
let count = cells.len();
if count < 1 {
return LayoutInfo { max: 0 as _, ..LayoutInfo::default() };
};
let is_stretch = alignment == LayoutAlignment::Stretch;
let extra_w = padding.begin + padding.end + spacing * (count - 1) as Coord;
let min = cells.iter().map(|c| c.constraint.min).sum::<Coord>() + extra_w;
let max = if is_stretch {
(cells.iter().map(|c| c.constraint.max).fold(extra_w, Saturating::add)).max(min)
} else {
Coord::MAX
};
let preferred = cells.iter().map(|c| c.constraint.preferred_bounded()).sum::<Coord>() + extra_w;
let stretch = cells.iter().map(|c| c.constraint.stretch).sum::<f32>();
LayoutInfo { min, max, min_percent: 0 as _, max_percent: 100 as _, preferred, stretch }
}
pub fn box_layout_info_ortho(cells: Slice<BoxLayoutCellData>, padding: &Padding) -> LayoutInfo {
let count = cells.len();
if count < 1 {
return LayoutInfo { max: 0 as _, ..LayoutInfo::default() };
};
let extra_w = padding.begin + padding.end;
let mut fold =
cells.iter().fold(LayoutInfo { stretch: f32::MAX, ..Default::default() }, |a, b| {
a.merge(&b.constraint)
});
fold.max = fold.max.max(fold.min);
fold.preferred = fold.preferred.clamp(fold.min, fold.max);
fold.min += extra_w;
fold.max = Saturating::add(fold.max, extra_w);
fold.preferred += extra_w;
fold
}
/// Given the cells of a layout of a Dialog, re-order the button according to the platform
///
/// This function assume that the `roles` contains the roles of the button which are the first `cells`
/// It will simply change the column field of the cell
pub fn reorder_dialog_button_layout(cells: &mut [GridLayoutCellData], roles: &[DialogButtonRole]) {
fn add_buttons(
cells: &mut [GridLayoutCellData],
roles: &[DialogButtonRole],
idx: &mut u16,
role: DialogButtonRole,
) {
for (cell, r) in cells.iter_mut().zip(roles.iter()) {
if *r == role {
cell.col_or_row = *idx;
*idx += 1;
}
}
}
#[cfg(feature = "std")]
fn is_kde() -> bool {
// assume some unix check if XDG_CURRENT_DESKTOP stats with K
std::env::var("XDG_CURRENT_DESKTOP")
.ok()
.and_then(|v| v.as_bytes().first().copied())
.is_some_and(|x| x.eq_ignore_ascii_case(&b'K'))
}
#[cfg(not(feature = "std"))]
let is_kde = || true;
let mut idx = 0;
if cfg!(windows) {
add_buttons(cells, roles, &mut idx, DialogButtonRole::Reset);
idx += 1;
add_buttons(cells, roles, &mut idx, DialogButtonRole::Accept);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Action);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Reject);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Apply);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Help);
} else if cfg!(target_os = "macos") {
add_buttons(cells, roles, &mut idx, DialogButtonRole::Help);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Reset);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Apply);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Action);
idx += 1;
add_buttons(cells, roles, &mut idx, DialogButtonRole::Reject);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Accept);
} else if is_kde() {
// KDE variant
add_buttons(cells, roles, &mut idx, DialogButtonRole::Help);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Reset);
idx += 1;
add_buttons(cells, roles, &mut idx, DialogButtonRole::Action);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Accept);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Apply);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Reject);
} else {
// GNOME variant and fallback for WASM build
add_buttons(cells, roles, &mut idx, DialogButtonRole::Help);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Reset);
idx += 1;
add_buttons(cells, roles, &mut idx, DialogButtonRole::Action);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Apply);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Reject);
add_buttons(cells, roles, &mut idx, DialogButtonRole::Accept);
}
}
#[cfg(feature = "ffi")]
pub(crate) mod ffi {
#![allow(unsafe_code)]
use super::*;
#[unsafe(no_mangle)]
pub extern "C" fn slint_solve_grid_layout(
data: &GridLayoutData,
result: &mut SharedVector<Coord>,
) {
*result = super::solve_grid_layout(data)
}
#[unsafe(no_mangle)]
pub extern "C" fn slint_grid_layout_info(
cells: Slice<GridLayoutCellData>,
spacing: Coord,
padding: &Padding,
) -> LayoutInfo {
super::grid_layout_info(cells, spacing, padding)
}
#[unsafe(no_mangle)]
pub extern "C" fn slint_solve_box_layout(
data: &BoxLayoutData,
repeater_indexes: Slice<u32>,
result: &mut SharedVector<Coord>,
) {
*result = super::solve_box_layout(data, repeater_indexes)
}
#[unsafe(no_mangle)]
/// Return the LayoutInfo for a BoxLayout with the given cells.
pub extern "C" fn slint_box_layout_info(
cells: Slice<BoxLayoutCellData>,
spacing: Coord,
padding: &Padding,
alignment: LayoutAlignment,
) -> LayoutInfo {
super::box_layout_info(cells, spacing, padding, alignment)
}
#[unsafe(no_mangle)]
/// Return the LayoutInfo for a BoxLayout with the given cells.
pub extern "C" fn slint_box_layout_info_ortho(
cells: Slice<BoxLayoutCellData>,
padding: &Padding,
) -> LayoutInfo {
super::box_layout_info_ortho(cells, padding)
}
/// Calls [`reorder_dialog_button_layout`].
///
/// Safety: `cells` must be a pointer to a mutable array of cell data, the array must have at
/// least `roles.len()` elements.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn slint_reorder_dialog_button_layout(
cells: *mut GridLayoutCellData,
roles: Slice<DialogButtonRole>,
) {
reorder_dialog_button_layout(core::slice::from_raw_parts_mut(cells, roles.len()), &roles);
}
}
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