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slint/internal/compiler/passes/lower_layout.rs
Milian Wolff 0f6c3a4fd7 Use SmolStr in more places of the compiler infrastructure 
This removes a lot of allocations and speeds up the compiler step
a bit. Sadly, this patch is very invasive as it touches a lot of
files. That said, each individual hunk is pretty trivial.

For a non-trivial real-world example, the impact is significant,
we get rid of ~29% of all allocations and improve the runtime by
about 4.8% (measured until the viewer loop would start).

Before:
```
Benchmark 1: ./target/release/slint-viewer ../slint-perf/app.slint
  Time (mean ± σ):     664.2 ms ±   6.7 ms    [User: 589.2 ms, System: 74.0 ms]
  Range (min … max):   659.0 ms … 682.4 ms    10 runs

        allocations:            4886888
        temporary allocations:  857508
```

After:
```
Benchmark 1: ./target/release/slint-viewer ../slint-perf/app.slint
  Time (mean ± σ):     639.5 ms ±  17.8 ms    [User: 556.9 ms, System: 76.2 ms]
  Range (min … max):   621.4 ms … 666.5 ms    10 runs

        allocations:            3544318
        temporary allocations:  495685
```
2024-10-17 18:04:58 +02:00

814 lines
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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
//! Passe that compute the layout constraint
use lyon_path::geom::euclid::approxeq::ApproxEq;
use crate::diagnostics::BuildDiagnostics;
use crate::diagnostics::Spanned;
use crate::expression_tree::*;
use crate::langtype::ElementType;
use crate::langtype::Type;
use crate::layout::*;
use crate::object_tree::*;
use crate::typeloader::TypeLoader;
use crate::typeregister::TypeRegister;
use smol_str::format_smolstr;
use std::cell::RefCell;
use std::collections::HashSet;
use std::rc::Rc;
pub fn lower_layouts(
component: &Rc<Component>,
type_loader: &mut TypeLoader,
style_metrics: &Rc<Component>,
diag: &mut BuildDiagnostics,
) {
// lower the preferred-{width, height}: 100%;
recurse_elem_including_sub_components(component, &(), &mut |elem, _| {
if check_preferred_size_100(elem, "preferred-width", diag) {
elem.borrow_mut().default_fill_parent.0 = true;
}
if check_preferred_size_100(elem, "preferred-height", diag) {
elem.borrow_mut().default_fill_parent.1 = true;
}
let base = elem.borrow().sub_component().cloned();
if let Some(base) = base {
let base = base.root_element.borrow();
let mut elem_mut = elem.borrow_mut();
elem_mut.default_fill_parent.0 |= base.default_fill_parent.0;
elem_mut.default_fill_parent.1 |= base.default_fill_parent.1;
}
});
*component.root_constraints.borrow_mut() =
LayoutConstraints::new(&component.root_element, diag);
recurse_elem_including_sub_components(component, &(), &mut |elem, _| {
let component = elem.borrow().enclosing_component.upgrade().unwrap();
lower_element_layout(
&component,
elem,
&type_loader.global_type_registry.borrow(),
style_metrics,
diag,
);
check_no_layout_properties(elem, diag);
});
}
fn check_preferred_size_100(elem: &ElementRc, prop: &str, diag: &mut BuildDiagnostics) -> bool {
let ret = if let Some(p) = elem.borrow().bindings.get(prop) {
if p.borrow().expression.ty() == Type::Percent {
if !matches!(p.borrow().expression, Expression::NumberLiteral(val, _) if val == 100.) {
diag.push_error(
format!("{prop} must either be a length, or the literal '100%'"),
&*p.borrow(),
);
}
true
} else {
false
}
} else {
false
};
if ret {
elem.borrow_mut().bindings.remove(prop).unwrap();
return true;
}
false
}
fn lower_element_layout(
component: &Rc<Component>,
elem: &ElementRc,
type_register: &TypeRegister,
style_metrics: &Rc<Component>,
diag: &mut BuildDiagnostics,
) {
let base_type = if let ElementType::Builtin(base_type) = &elem.borrow().base_type {
base_type.clone()
} else {
return;
};
match base_type.name.as_str() {
"Row" => {
// We shouldn't lower layout if we have a Row in there. Unless the Row is the root of a repeated item,
// in which case another error has been reported
assert!(
diag.has_errors()
&& Rc::ptr_eq(&component.root_element, elem)
&& component
.parent_element
.upgrade()
.map_or(false, |e| e.borrow().repeated.is_some()),
"Error should have been caught at element lookup time"
);
return;
}
"GridLayout" => lower_grid_layout(component, elem, diag, type_register),
"HorizontalLayout" => lower_box_layout(elem, diag, Orientation::Horizontal),
"VerticalLayout" => lower_box_layout(elem, diag, Orientation::Vertical),
"Dialog" => {
lower_dialog_layout(elem, style_metrics, diag);
return; // the Dialog stays in the tree as a Dialog
}
_ => return,
};
{
let mut elem = elem.borrow_mut();
let elem = &mut *elem;
let prev_base = std::mem::replace(&mut elem.base_type, type_register.empty_type());
elem.default_fill_parent = (true, true);
// Create fake properties for the layout properties
for (p, ty) in prev_base.property_list() {
if !elem.base_type.lookup_property(&p).is_valid()
&& !elem.property_declarations.contains_key(&p)
{
elem.property_declarations.insert(p, ty.into());
}
}
}
}
fn lower_grid_layout(
component: &Rc<Component>,
grid_layout_element: &ElementRc,
diag: &mut BuildDiagnostics,
type_register: &TypeRegister,
) {
let mut grid = GridLayout {
elems: Default::default(),
geometry: LayoutGeometry::new(grid_layout_element),
dialog_button_roles: None,
};
let layout_cache_prop_h =
create_new_prop(grid_layout_element, "layout-cache-h", Type::LayoutCache);
let layout_cache_prop_v =
create_new_prop(grid_layout_element, "layout-cache-v", Type::LayoutCache);
let layout_info_prop_h =
create_new_prop(grid_layout_element, "layoutinfo-h", layout_info_type());
let layout_info_prop_v =
create_new_prop(grid_layout_element, "layoutinfo-v", layout_info_type());
let mut row = 0;
let mut col = 0;
let layout_children = std::mem::take(&mut grid_layout_element.borrow_mut().children);
let mut collected_children = Vec::new();
for layout_child in layout_children {
let is_row = if let ElementType::Builtin(be) = &layout_child.borrow().base_type {
be.name == "Row"
} else {
false
};
if is_row {
if col > 0 {
row += 1;
col = 0;
}
let row_children = std::mem::take(&mut layout_child.borrow_mut().children);
for x in row_children {
grid.add_element(
&x,
(&mut row, &mut col),
&layout_cache_prop_h,
&layout_cache_prop_v,
diag,
);
col += 1;
collected_children.push(x);
}
if col > 0 {
row += 1;
col = 0;
}
if layout_child.borrow().has_popup_child {
// We need to keep that element otherwise the popup will malfunction
layout_child.borrow_mut().base_type = type_register.empty_type();
collected_children.push(layout_child);
} else {
component.optimized_elements.borrow_mut().push(layout_child);
}
} else {
grid.add_element(
&layout_child,
(&mut row, &mut col),
&layout_cache_prop_h,
&layout_cache_prop_v,
diag,
);
col += 1;
collected_children.push(layout_child);
}
}
grid_layout_element.borrow_mut().children = collected_children;
let span = grid_layout_element.borrow().to_source_location();
layout_cache_prop_h.element().borrow_mut().bindings.insert(
layout_cache_prop_h.name().into(),
BindingExpression::new_with_span(
Expression::SolveLayout(Layout::GridLayout(grid.clone()), Orientation::Horizontal),
span.clone(),
)
.into(),
);
layout_cache_prop_v.element().borrow_mut().bindings.insert(
layout_cache_prop_v.name().into(),
BindingExpression::new_with_span(
Expression::SolveLayout(Layout::GridLayout(grid.clone()), Orientation::Vertical),
span.clone(),
)
.into(),
);
layout_info_prop_h.element().borrow_mut().bindings.insert(
layout_info_prop_h.name().into(),
BindingExpression::new_with_span(
Expression::ComputeLayoutInfo(
Layout::GridLayout(grid.clone()),
Orientation::Horizontal,
),
span.clone(),
)
.into(),
);
layout_info_prop_v.element().borrow_mut().bindings.insert(
layout_info_prop_v.name().into(),
BindingExpression::new_with_span(
Expression::ComputeLayoutInfo(Layout::GridLayout(grid.clone()), Orientation::Vertical),
span,
)
.into(),
);
grid_layout_element.borrow_mut().layout_info_prop =
Some((layout_info_prop_h, layout_info_prop_v));
for d in grid_layout_element.borrow_mut().debug.iter_mut() {
d.layout = Some(Layout::GridLayout(grid.clone()));
}
}
impl GridLayout {
fn add_element(
&mut self,
item_element: &ElementRc,
(row, col): (&mut u16, &mut u16),
layout_cache_prop_h: &NamedReference,
layout_cache_prop_v: &NamedReference,
diag: &mut BuildDiagnostics,
) {
let mut get_const_value = |name: &str| {
item_element
.borrow_mut()
.bindings
.remove(name)
.and_then(|e| eval_const_expr(&e.borrow().expression, name, &*e.borrow(), diag))
};
let colspan = get_const_value("colspan").unwrap_or(1);
let rowspan = get_const_value("rowspan").unwrap_or(1);
if let Some(r) = get_const_value("row") {
*row = r;
*col = 0;
}
if let Some(c) = get_const_value("col") {
*col = c;
}
self.add_element_with_coord(
item_element,
(*row, *col),
(rowspan, colspan),
layout_cache_prop_h,
layout_cache_prop_v,
diag,
)
}
fn add_element_with_coord(
&mut self,
item_element: &ElementRc,
(row, col): (u16, u16),
(rowspan, colspan): (u16, u16),
layout_cache_prop_h: &NamedReference,
layout_cache_prop_v: &NamedReference,
diag: &mut BuildDiagnostics,
) {
let index = self.elems.len();
if let Some(layout_item) = create_layout_item(item_element, diag) {
if layout_item.repeater_index.is_some() {
diag.push_error(
"'if' or 'for' expressions are not currently supported in grid layouts"
.to_string(),
&*item_element.borrow(),
);
return;
}
let e = &layout_item.elem;
set_prop_from_cache(e, "x", layout_cache_prop_h, index * 2, &None, diag);
if !layout_item.item.constraints.fixed_width {
set_prop_from_cache(e, "width", layout_cache_prop_h, index * 2 + 1, &None, diag);
}
set_prop_from_cache(e, "y", layout_cache_prop_v, index * 2, &None, diag);
if !layout_item.item.constraints.fixed_height {
set_prop_from_cache(e, "height", layout_cache_prop_v, index * 2 + 1, &None, diag);
}
self.elems.push(GridLayoutElement {
col,
row,
colspan,
rowspan,
item: layout_item.item,
});
}
}
}
fn lower_box_layout(
layout_element: &ElementRc,
diag: &mut BuildDiagnostics,
orientation: Orientation,
) {
let mut layout = BoxLayout {
orientation,
elems: Default::default(),
geometry: LayoutGeometry::new(layout_element),
};
let layout_cache_prop = create_new_prop(layout_element, "layout-cache", Type::LayoutCache);
let layout_info_prop_v = create_new_prop(layout_element, "layoutinfo-v", layout_info_type());
let layout_info_prop_h = create_new_prop(layout_element, "layoutinfo-h", layout_info_type());
let layout_children = std::mem::take(&mut layout_element.borrow_mut().children);
let (begin_padding, end_padding) = match orientation {
Orientation::Horizontal => (&layout.geometry.padding.top, &layout.geometry.padding.bottom),
Orientation::Vertical => (&layout.geometry.padding.left, &layout.geometry.padding.right),
};
let (pos, size, pad, ortho) = match orientation {
Orientation::Horizontal => ("x", "width", "y", "height"),
Orientation::Vertical => ("y", "height", "x", "width"),
};
let pad_expr = begin_padding.clone().map(Expression::PropertyReference);
let mut size_expr = Expression::PropertyReference(NamedReference::new(layout_element, ortho));
if let Some(p) = begin_padding {
size_expr = Expression::BinaryExpression {
lhs: Box::new(std::mem::take(&mut size_expr)),
rhs: Box::new(Expression::PropertyReference(p.clone())),
op: '-',
}
}
if let Some(p) = end_padding {
size_expr = Expression::BinaryExpression {
lhs: Box::new(std::mem::take(&mut size_expr)),
rhs: Box::new(Expression::PropertyReference(p.clone())),
op: '-',
}
}
for layout_child in &layout_children {
if let Some(item) = create_layout_item(layout_child, diag) {
let index = layout.elems.len() * 2;
let rep_idx = &item.repeater_index;
let (fixed_size, fixed_ortho) = match orientation {
Orientation::Horizontal => {
(item.item.constraints.fixed_width, item.item.constraints.fixed_height)
}
Orientation::Vertical => {
(item.item.constraints.fixed_height, item.item.constraints.fixed_width)
}
};
let actual_elem = &item.elem;
set_prop_from_cache(actual_elem, pos, &layout_cache_prop, index, rep_idx, diag);
if !fixed_size {
set_prop_from_cache(
actual_elem,
size,
&layout_cache_prop,
index + 1,
rep_idx,
diag,
);
}
if let Some(pad_expr) = pad_expr.clone() {
actual_elem.borrow_mut().bindings.insert(pad.into(), RefCell::new(pad_expr.into()));
}
if !fixed_ortho {
actual_elem
.borrow_mut()
.bindings
.insert(ortho.into(), RefCell::new(size_expr.clone().into()));
}
layout.elems.push(item.item);
}
}
layout_element.borrow_mut().children = layout_children;
let span = layout_element.borrow().to_source_location();
layout_cache_prop.element().borrow_mut().bindings.insert(
layout_cache_prop.name().into(),
BindingExpression::new_with_span(
Expression::SolveLayout(Layout::BoxLayout(layout.clone()), orientation),
span.clone(),
)
.into(),
);
layout_info_prop_h.element().borrow_mut().bindings.insert(
layout_info_prop_h.name().into(),
BindingExpression::new_with_span(
Expression::ComputeLayoutInfo(
Layout::BoxLayout(layout.clone()),
Orientation::Horizontal,
),
span.clone(),
)
.into(),
);
layout_info_prop_v.element().borrow_mut().bindings.insert(
layout_info_prop_v.name().into(),
BindingExpression::new_with_span(
Expression::ComputeLayoutInfo(Layout::BoxLayout(layout.clone()), Orientation::Vertical),
span,
)
.into(),
);
layout_element.borrow_mut().layout_info_prop = Some((layout_info_prop_h, layout_info_prop_v));
for d in layout_element.borrow_mut().debug.iter_mut() {
d.layout = Some(Layout::BoxLayout(layout.clone()));
}
}
fn lower_dialog_layout(
dialog_element: &ElementRc,
style_metrics: &Rc<Component>,
diag: &mut BuildDiagnostics,
) {
let mut grid = GridLayout {
elems: Default::default(),
geometry: LayoutGeometry::new(dialog_element),
dialog_button_roles: None,
};
let metrics = &style_metrics.root_element;
grid.geometry.padding.bottom.get_or_insert(NamedReference::new(metrics, "layout-padding"));
grid.geometry.padding.top.get_or_insert(NamedReference::new(metrics, "layout-padding"));
grid.geometry.padding.left.get_or_insert(NamedReference::new(metrics, "layout-padding"));
grid.geometry.padding.right.get_or_insert(NamedReference::new(metrics, "layout-padding"));
grid.geometry.spacing.horizontal.get_or_insert(NamedReference::new(metrics, "layout-spacing"));
grid.geometry.spacing.vertical.get_or_insert(NamedReference::new(metrics, "layout-spacing"));
let layout_cache_prop_h = create_new_prop(dialog_element, "layout-cache-h", Type::LayoutCache);
let layout_cache_prop_v = create_new_prop(dialog_element, "layout-cache-v", Type::LayoutCache);
let layout_info_prop_h = create_new_prop(dialog_element, "layoutinfo-h", layout_info_type());
let layout_info_prop_v = create_new_prop(dialog_element, "layoutinfo-v", layout_info_type());
let mut main_widget = None;
let mut button_roles = vec![];
let mut seen_buttons = HashSet::new();
let layout_children = std::mem::take(&mut dialog_element.borrow_mut().children);
for layout_child in &layout_children {
let dialog_button_role_binding =
layout_child.borrow_mut().bindings.remove("dialog-button-role");
let is_button = if let Some(role_binding) = dialog_button_role_binding {
let role_binding = role_binding.into_inner();
if let Expression::EnumerationValue(val) = &role_binding.expression {
let en = &val.enumeration;
debug_assert_eq!(en.name, "DialogButtonRole");
button_roles.push(en.values[val.value].clone());
if val.value == 0 {
diag.push_error(
"The `dialog-button-role` cannot be set explicitly to none".into(),
&role_binding,
);
}
} else {
diag.push_error(
"The `dialog-button-role` property must be known at compile-time".into(),
&role_binding,
);
}
true
} else if matches!(&layout_child.borrow().lookup_property("kind").property_type, Type::Enumeration(e) if e.name == "StandardButtonKind")
{
// layout_child is a StandardButton
match layout_child.borrow().bindings.get("kind") {
None => diag.push_error(
"The `kind` property of the StandardButton in a Dialog must be set".into(),
&*layout_child.borrow(),
),
Some(binding) => {
let binding = &*binding.borrow();
if let Expression::EnumerationValue(val) = &binding.expression {
let en = &val.enumeration;
debug_assert_eq!(en.name, "StandardButtonKind");
let kind = &en.values[val.value];
let role = match kind.as_str() {
"ok" => "accept",
"cancel" => "reject",
"apply" => "apply",
"close" => "reject",
"reset" => "reset",
"help" => "help",
"yes" => "accept",
"no" => "reject",
"abort" => "reject",
"retry" => "accept",
"ignore" => "accept",
_ => unreachable!(),
};
button_roles.push(role.into());
if !seen_buttons.insert(val.value) {
diag.push_error("Duplicated `kind`: There are two StandardButton in this Dialog with the same kind".into(), binding);
} else if Rc::ptr_eq(
dialog_element,
&dialog_element
.borrow()
.enclosing_component
.upgrade()
.unwrap()
.root_element,
) {
let clicked_ty =
layout_child.borrow().lookup_property("clicked").property_type;
if matches!(&clicked_ty, Type::Callback { .. })
&& layout_child.borrow().bindings.get("clicked").map_or(true, |c| {
matches!(c.borrow().expression, Expression::Invalid)
})
{
dialog_element
.borrow_mut()
.property_declarations
.entry(format_smolstr!("{}-clicked", kind))
.or_insert_with(|| PropertyDeclaration {
property_type: clicked_ty,
node: None,
expose_in_public_api: true,
is_alias: Some(NamedReference::new(
layout_child,
"clicked",
)),
visibility: PropertyVisibility::InOut,
pure: None,
});
}
}
} else {
diag.push_error(
"The `kind` property of the StandardButton in a Dialog must be known at compile-time"
.into(),
binding,
);
}
}
}
true
} else {
false
};
if is_button {
grid.add_element_with_coord(
layout_child,
(1, button_roles.len() as u16),
(1, 1),
&layout_cache_prop_h,
&layout_cache_prop_v,
diag,
);
} else if main_widget.is_some() {
diag.push_error(
"A Dialog can have only one child element that is not a StandardButton".into(),
&*layout_child.borrow(),
);
} else {
main_widget = Some(layout_child.clone())
}
}
dialog_element.borrow_mut().children = layout_children;
if let Some(main_widget) = main_widget {
grid.add_element_with_coord(
&main_widget,
(0, 0),
(1, button_roles.len() as u16 + 1),
&layout_cache_prop_h,
&layout_cache_prop_v,
diag,
);
} else {
diag.push_error(
"A Dialog must have a single child element that is not StandardButton".into(),
&*dialog_element.borrow(),
);
}
grid.dialog_button_roles = Some(button_roles);
let span = dialog_element.borrow().to_source_location();
layout_cache_prop_h.element().borrow_mut().bindings.insert(
layout_cache_prop_h.name().into(),
BindingExpression::new_with_span(
Expression::SolveLayout(Layout::GridLayout(grid.clone()), Orientation::Horizontal),
span.clone(),
)
.into(),
);
layout_cache_prop_v.element().borrow_mut().bindings.insert(
layout_cache_prop_v.name().into(),
BindingExpression::new_with_span(
Expression::SolveLayout(Layout::GridLayout(grid.clone()), Orientation::Vertical),
span.clone(),
)
.into(),
);
layout_info_prop_h.element().borrow_mut().bindings.insert(
layout_info_prop_h.name().into(),
BindingExpression::new_with_span(
Expression::ComputeLayoutInfo(
Layout::GridLayout(grid.clone()),
Orientation::Horizontal,
),
span.clone(),
)
.into(),
);
layout_info_prop_v.element().borrow_mut().bindings.insert(
layout_info_prop_v.name().into(),
BindingExpression::new_with_span(
Expression::ComputeLayoutInfo(Layout::GridLayout(grid.clone()), Orientation::Vertical),
span,
)
.into(),
);
dialog_element.borrow_mut().layout_info_prop = Some((layout_info_prop_h, layout_info_prop_v));
for d in dialog_element.borrow_mut().debug.iter_mut() {
d.layout = Some(Layout::GridLayout(grid.clone()));
}
}
struct CreateLayoutItemResult {
item: LayoutItem,
elem: ElementRc,
repeater_index: Option<Expression>,
}
/// Create a LayoutItem for the given `item_element` returns None is the layout is empty
fn create_layout_item(
item_element: &ElementRc,
diag: &mut BuildDiagnostics,
) -> Option<CreateLayoutItemResult> {
let fix_explicit_percent = |prop: &str, item: &ElementRc| {
if !item.borrow().bindings.get(prop).map_or(false, |b| b.borrow().ty() == Type::Percent) {
return;
}
let mut item = item.borrow_mut();
let b = item.bindings.remove(prop).unwrap();
item.bindings.insert(format_smolstr!("min-{}", prop), b.clone());
item.bindings.insert(format_smolstr!("max-{}", prop), b);
item.property_declarations.insert(
format_smolstr!("min-{}", prop),
PropertyDeclaration { property_type: Type::Percent, ..PropertyDeclaration::default() },
);
item.property_declarations.insert(
format_smolstr!("max-{}", prop),
PropertyDeclaration { property_type: Type::Percent, ..PropertyDeclaration::default() },
);
};
fix_explicit_percent("width", item_element);
fix_explicit_percent("height", item_element);
item_element.borrow_mut().child_of_layout = true;
let (repeater_index, actual_elem) = if let Some(r) = &item_element.borrow().repeated {
let rep_comp = item_element.borrow().base_type.as_component().clone();
fix_explicit_percent("width", &rep_comp.root_element);
fix_explicit_percent("height", &rep_comp.root_element);
*rep_comp.root_constraints.borrow_mut() =
LayoutConstraints::new(&rep_comp.root_element, diag);
rep_comp.root_element.borrow_mut().child_of_layout = true;
(
Some(if r.is_conditional_element {
Expression::NumberLiteral(0., Unit::None)
} else {
Expression::RepeaterIndexReference { element: Rc::downgrade(item_element) }
}),
rep_comp.root_element.clone(),
)
} else {
(None, item_element.clone())
};
let constraints = LayoutConstraints::new(&actual_elem, diag);
Some(CreateLayoutItemResult {
item: LayoutItem { element: item_element.clone(), constraints },
elem: actual_elem,
repeater_index,
})
}
fn set_prop_from_cache(
elem: &ElementRc,
prop: &str,
layout_cache_prop: &NamedReference,
index: usize,
repeater_index: &Option<Expression>,
diag: &mut BuildDiagnostics,
) {
let old = elem.borrow_mut().bindings.insert(
prop.into(),
BindingExpression::new_with_span(
Expression::LayoutCacheAccess {
layout_cache_prop: layout_cache_prop.clone(),
index,
repeater_index: repeater_index.as_ref().map(|x| Box::new(x.clone())),
},
layout_cache_prop.element().borrow().to_source_location(),
)
.into(),
);
if let Some(old) = old.map(RefCell::into_inner) {
diag.push_error(
format!("The property '{}' cannot be set for elements placed in this layout, because the layout is already setting it", prop),
&old,
);
}
}
fn eval_const_expr(
expression: &Expression,
name: &str,
span: &dyn crate::diagnostics::Spanned,
diag: &mut BuildDiagnostics,
) -> Option<u16> {
match expression {
Expression::NumberLiteral(v, Unit::None) => {
if *v < 0. || *v > u16::MAX as f64 || !v.trunc().approx_eq(v) {
diag.push_error(format!("'{}' must be a positive integer", name), span);
None
} else {
Some(*v as u16)
}
}
Expression::Cast { from, .. } => eval_const_expr(from, name, span, diag),
_ => {
diag.push_error(format!("'{}' must be an integer literal", name), span);
None
}
}
}
/// Checks that there is grid-layout specific properties left
fn check_no_layout_properties(item: &ElementRc, diag: &mut BuildDiagnostics) {
for (prop, expr) in item.borrow().bindings.iter() {
if matches!(prop.as_ref(), "col" | "row" | "colspan" | "rowspan") {
diag.push_error(format!("{} used outside of a GridLayout", prop), &*expr.borrow());
}
if matches!(prop.as_ref(), "dialog-button-role") {
diag.push_error(format!("{} used outside of a Dialog", prop), &*expr.borrow());
}
}
}
/// For fixed layout, we need to dissociate the width and the height property of the WindowItem from width and height property
/// in slint such that the width and height property are actually constants.
///
/// The Slint runtime will change the width and height property of the native WindowItem to match those of the actual
/// window, but we don't want that to happen if we have a fixed layout.
pub fn check_window_layout(component: &Rc<Component>) {
if component.root_constraints.borrow().fixed_height {
adjust_window_layout(component, "height");
}
if component.root_constraints.borrow().fixed_width {
adjust_window_layout(component, "width");
}
}
fn adjust_window_layout(component: &Rc<Component>, prop: &str) {
let new_prop = crate::layout::create_new_prop(
&component.root_element,
&format!("fixed-{prop}"),
Type::LogicalLength,
);
{
let mut root = component.root_element.borrow_mut();
if let Some(b) = root.bindings.remove(prop) {
root.bindings.insert(new_prop.name().into(), b);
};
let mut analysis = root.property_analysis.borrow_mut();
if let Some(a) = analysis.remove(prop) {
analysis.insert(new_prop.name().into(), a);
};
drop(analysis);
root.bindings.insert(
prop.into(),
RefCell::new(Expression::PropertyReference(new_prop.clone()).into()),
);
}
let old_prop = NamedReference::new(&component.root_element, prop);
crate::object_tree::visit_all_named_references(component, &mut |nr| {
if nr == &old_prop {
*nr = new_prop.clone()
}
});
}
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