zng_app/widget/node/
extend.rsuse std::sync::Arc;
use parking_lot::Mutex;
use zng_app_proc_macros::ui_node;
use crate::widget::WidgetUpdateMode;
use super::*;
pub fn extend_widget(widget: impl UiNode, build_extension: impl FnOnce(BoxedUiNode) -> BoxedUiNode) -> impl UiNode {
let widget = Arc::new(Mutex::new(widget.boxed()));
let child = build_extension(ExtendWidgetChildNode { widget: widget.clone() }.boxed());
ExtendWidgetNode { widget, child }
}
struct ExtendWidgetChildNode {
widget: Arc<Mutex<BoxedUiNode>>,
}
#[ui_node(delegate = self.widget.lock())]
impl UiNode for ExtendWidgetChildNode {
fn is_widget(&self) -> bool {
self.widget.lock().is_widget()
}
fn with_context<R, F>(&mut self, update_mode: WidgetUpdateMode, f: F) -> Option<R>
where
F: FnOnce() -> R,
{
self.widget.lock().with_context(update_mode, f)
}
}
struct ExtendWidgetNode {
widget: Arc<Mutex<BoxedUiNode>>,
child: BoxedUiNode,
}
#[ui_node(child)]
impl UiNode for ExtendWidgetNode {
fn is_widget(&self) -> bool {
self.widget.lock().is_widget()
}
fn with_context<R, F>(&mut self, update_mode: WidgetUpdateMode, f: F) -> Option<R>
where
F: FnOnce() -> R,
{
self.widget.lock().with_context(update_mode, f)
}
}