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use crate::debug_state::DebugState;
use std::f64::INFINITY;
use tracing::{instrument, trace, warn};
use crate::widget::prelude::*;
use crate::widget::Axis;
use crate::{Data, KeyOrValue};
pub struct SizedBox<T> {
child: Option<Box<dyn Widget<T>>>,
width: Option<KeyOrValue<f64>>,
height: Option<KeyOrValue<f64>>,
}
impl<T> SizedBox<T> {
pub fn new(child: impl Widget<T> + 'static) -> Self {
Self {
child: Some(Box::new(child)),
width: None,
height: None,
}
}
#[doc(alias = "null")]
pub fn empty() -> Self {
Self {
child: None,
width: None,
height: None,
}
}
pub fn width(mut self, width: impl Into<KeyOrValue<f64>>) -> Self {
self.width = Some(width.into());
self
}
pub fn height(mut self, height: impl Into<KeyOrValue<f64>>) -> Self {
self.height = Some(height.into());
self
}
pub fn expand(mut self) -> Self {
self.width = Some(KeyOrValue::Concrete(INFINITY));
self.height = Some(KeyOrValue::Concrete(INFINITY));
self
}
pub fn expand_width(mut self) -> Self {
self.width = Some(KeyOrValue::Concrete(INFINITY));
self
}
pub fn expand_height(mut self) -> Self {
self.height = Some(KeyOrValue::Concrete(INFINITY));
self
}
fn child_constraints(&self, bc: &BoxConstraints, env: &Env) -> BoxConstraints {
let (min_width, max_width) = match &self.width {
Some(width) => {
let width = width.resolve(env);
let w = width.clamp(bc.min().width, bc.max().width);
(w, w)
}
None => (bc.min().width, bc.max().width),
};
let (min_height, max_height) = match &self.height {
Some(height) => {
let height = height.resolve(env);
let h = height.clamp(bc.min().height, bc.max().height);
(h, h)
}
None => (bc.min().height, bc.max().height),
};
BoxConstraints::new(
Size::new(min_width, min_height),
Size::new(max_width, max_height),
)
}
#[cfg(test)]
pub(crate) fn width_and_height(&self, env: &Env) -> (Option<f64>, Option<f64>) {
(
self.width.as_ref().map(|w| w.resolve(env)),
self.height.as_ref().map(|h| h.resolve(env)),
)
}
}
impl<T: Data> Widget<T> for SizedBox<T> {
#[instrument(name = "SizedBox", level = "trace", skip(self, ctx, event, data, env))]
fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut T, env: &Env) {
if let Some(ref mut child) = self.child {
child.event(ctx, event, data, env);
}
}
#[instrument(name = "SizedBox", level = "trace", skip(self, ctx, event, data, env))]
fn lifecycle(&mut self, ctx: &mut LifeCycleCtx, event: &LifeCycle, data: &T, env: &Env) {
if let Some(ref mut child) = self.child {
child.lifecycle(ctx, event, data, env)
}
}
#[instrument(
name = "SizedBox",
level = "trace",
skip(self, ctx, old_data, data, env)
)]
fn update(&mut self, ctx: &mut UpdateCtx, old_data: &T, data: &T, env: &Env) {
if let Some(ref mut child) = self.child {
child.update(ctx, old_data, data, env);
}
}
#[instrument(name = "SizedBox", level = "trace", skip(self, ctx, bc, data, env))]
fn layout(&mut self, ctx: &mut LayoutCtx, bc: &BoxConstraints, data: &T, env: &Env) -> Size {
bc.debug_check("SizedBox");
let child_bc = self.child_constraints(bc, env);
let size = match self.child.as_mut() {
Some(child) => child.layout(ctx, &child_bc, data, env),
None => bc.constrain((
self.width
.as_ref()
.unwrap_or(&KeyOrValue::Concrete(0.0))
.resolve(env),
self.height
.as_ref()
.unwrap_or(&KeyOrValue::Concrete(0.0))
.resolve(env),
)),
};
trace!("Computed size: {}", size);
if size.width.is_infinite() {
warn!("SizedBox is returning an infinite width.");
}
if size.height.is_infinite() {
warn!("SizedBox is returning an infinite height.");
}
size
}
#[instrument(name = "SizedBox", level = "trace", skip(self, ctx, data, env))]
fn paint(&mut self, ctx: &mut PaintCtx, data: &T, env: &Env) {
if let Some(ref mut child) = self.child {
child.paint(ctx, data, env);
}
}
fn id(&self) -> Option<WidgetId> {
self.child.as_ref().and_then(|child| child.id())
}
fn debug_state(&self, data: &T) -> DebugState {
let children = if let Some(child) = &self.child {
vec![child.debug_state(data)]
} else {
vec![]
};
DebugState {
display_name: self.short_type_name().to_string(),
children,
..Default::default()
}
}
fn compute_max_intrinsic(
&mut self,
axis: Axis,
ctx: &mut LayoutCtx,
bc: &BoxConstraints,
data: &T,
env: &Env,
) -> f64 {
let kv = match axis {
Axis::Horizontal => self.width.as_ref(),
Axis::Vertical => self.height.as_ref(),
};
match (self.child.as_mut(), kv) {
(Some(c), Some(v)) => {
let v = v.resolve(env);
if v == f64::INFINITY {
c.compute_max_intrinsic(axis, ctx, bc, data, env)
} else {
v
}
}
(Some(c), None) => c.compute_max_intrinsic(axis, ctx, bc, data, env),
(None, Some(v)) => {
let v = v.resolve(env);
if v == f64::INFINITY {
warn!("SizedBox is without a child and its dim is infinite. Either give SizedBox a child or make its dim finite. ")
}
v
}
(None, None) => 0.,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{widget::Label, Key};
use test_log::test;
#[test]
fn expand() {
let env = Env::empty();
let expand = SizedBox::<()>::new(Label::new("hello!")).expand();
let bc = BoxConstraints::tight(Size::new(400., 400.)).loosen();
let child_bc = expand.child_constraints(&bc, &env);
assert_eq!(child_bc.min(), Size::new(400., 400.,));
}
#[test]
fn no_width() {
let mut env = Env::empty();
let expand = SizedBox::<()>::new(Label::new("hello!")).height(200.);
let bc = BoxConstraints::tight(Size::new(400., 400.)).loosen();
let child_bc = expand.child_constraints(&bc, &env);
assert_eq!(child_bc.min(), Size::new(0., 200.,));
assert_eq!(child_bc.max(), Size::new(400., 200.,));
const HEIGHT_KEY: Key<f64> = Key::new("test-no-width-height");
env.set(HEIGHT_KEY, 200.);
let expand = SizedBox::<()>::new(Label::new("hello!")).height(HEIGHT_KEY);
let child_bc = expand.child_constraints(&bc, &env);
assert_eq!(child_bc.min(), Size::new(0., 200.,));
assert_eq!(child_bc.max(), Size::new(400., 200.,));
}
}