ribir_core 0.2.0-alpha.3

Ribir is a framework for building modern native/wasm cross-platform user interface applications.
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use crate::prelude::*;

/// A widget that can delay drop its child until the `delay_drop_until` field be
/// set to `true`.
///
/// This widget not effect the widget lifecycle, if the widget is dispose but
/// the `delay_drop_until` is `false`, it's not part of the widget tree anymore
/// but not drop immediately, is disposed in `logic`, but not release resource.
/// It's be isolated from the widget tree and can layout and paint normally.
///
/// Once the `delay_drop_until` field be set to `true`, the widget will be
/// dropped.
///
/// It's useful when you need run a leave animation for a widget.
#[derive(Declare, Query)]
pub struct DelayDrop {
  #[declare(builtin)]
  pub delay_drop_until: bool,
}

impl ComposeChild for DelayDrop {
  type Child = Widget;
  #[inline]
  fn compose_child(this: impl StateWriter<Value = Self>, child: Self::Child) -> impl WidgetBuilder {
    fn_widget! {
      let modifies = this.raw_modifies();
      child.attach_state_data(this, ctx!()).dirty_subscribe(modifies, ctx!())
    }
  }
}