ribir_core 0.4.0-alpha.2

A non-intrusive declarative GUI framework, to build modern native/wasm cross-platform applications.
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use crate::prelude::*;

/// Widget keep the pointer press state of its child. As a builtin widget, user
/// can call `pointer_pressed` method to get the pressed state of a widget.
#[derive(Default)]
pub struct PointerPressed {
  pointer_pressed: bool,
}

impl Declare for PointerPressed {
  type Builder = FatObj<()>;
  #[inline]
  fn declarer() -> Self::Builder { FatObj::new(()) }
}

impl PointerPressed {
  // return if its child widget is pressed.
  #[inline]
  pub fn pointer_pressed(&self) -> bool { self.pointer_pressed }
}

impl ComposeChild for PointerPressed {
  type Child = Widget;
  fn compose_child(this: impl StateWriter<Value = Self>, child: Self::Child) -> impl WidgetBuilder {
    fn_widget! {
      @ $child {
        on_pointer_down: move|_| $this.write().pointer_pressed = true,
        on_pointer_up: move |_| $this.write().pointer_pressed = false,
      }
    }
  }
}