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use crate::*;
pub struct Canvas<F> {
func: F,
}
impl<F> View for Canvas<F>
where
F: Fn(LocalRect, &mut VGER),
{
fn print(&self, _id: ViewID, _cx: &mut Context) {
println!("canvas");
}
fn process(&self, _event: &Event, _id: ViewID, _cx: &mut Context, _vger: &mut VGER) {
}
fn draw(&self, id: ViewID, cx: &mut Context, vger: &mut VGER) {
let rect = cx.layout.entry(id).or_insert(LayoutBox::default()).rect;
vger.save();
(self.func)(rect, vger);
vger.restore();
}
fn layout(&self, id: ViewID, sz: LocalSize, cx: &mut Context, _vger: &mut VGER) -> LocalSize {
cx.layout.insert(
id,
LayoutBox {
rect: LocalRect::new(LocalPoint::zero(), sz),
offset: LocalOffset::zero(),
},
);
sz
}
fn hittest(
&self,
id: ViewID,
pt: LocalPoint,
cx: &mut Context,
_vger: &mut VGER,
) -> Option<ViewID> {
let rect = cx.layout.entry(id).or_insert(LayoutBox::default()).rect;
if rect.contains(pt) {
Some(id)
} else {
None
}
}
fn commands(&self, _id: ViewID, _cx: &mut Context, _cmds: &mut Vec<CommandInfo>) {}
fn gc(&self, _id: ViewID, _cx: &mut Context, _map: &mut StateMap) {}
fn access(
&self,
_id: ViewID,
_cx: &mut Context,
_nodes: &mut Vec<accesskit::Node>,
) -> Option<accesskit::NodeId> {
None
}
}
pub fn canvas<F: Fn(LocalRect, &mut VGER) + 'static>(f: F) -> impl View {
Canvas { func: f }
}
impl<F> private::Sealed for Canvas<F> {}