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use crate::debug_state::DebugState;
use crate::{
BoxConstraints, Data, Env, Event, EventCtx, LayoutCtx, LifeCycle, LifeCycleCtx, PaintCtx,
Point, Size, UpdateCtx, Widget, WidgetPod,
};
pub struct DisabledIf<T, W> {
child: WidgetPod<T, W>,
disabled_if: Box<dyn Fn(&T, &Env) -> bool>,
}
impl<T: Data, W: Widget<T>> DisabledIf<T, W> {
pub fn new(widget: W, disabled_if: impl Fn(&T, &Env) -> bool + 'static) -> Self {
DisabledIf {
child: WidgetPod::new(widget),
disabled_if: Box::new(disabled_if),
}
}
}
impl<T: Data, W: Widget<T>> Widget<T> for DisabledIf<T, W> {
fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut T, env: &Env) {
self.child.event(ctx, event, data, env);
}
fn lifecycle(&mut self, ctx: &mut LifeCycleCtx, event: &LifeCycle, data: &T, env: &Env) {
if let LifeCycle::WidgetAdded = event {
ctx.set_disabled((self.disabled_if)(data, env));
}
self.child.lifecycle(ctx, event, data, env);
}
fn update(&mut self, ctx: &mut UpdateCtx, _: &T, data: &T, env: &Env) {
ctx.set_disabled((self.disabled_if)(data, env));
self.child.update(ctx, data, env);
}
fn layout(&mut self, ctx: &mut LayoutCtx, bc: &BoxConstraints, data: &T, env: &Env) -> Size {
let size = self.child.layout(ctx, bc, data, env);
self.child.set_origin(ctx, Point::ZERO);
ctx.set_baseline_offset(self.child.baseline_offset());
size
}
fn paint(&mut self, ctx: &mut PaintCtx, data: &T, env: &Env) {
self.child.paint(ctx, data, env);
}
fn debug_state(&self, data: &T) -> DebugState {
DebugState {
display_name: self.short_type_name().to_string(),
children: vec![self.child.widget().debug_state(data)],
..Default::default()
}
}
}