8f0839e786
The idea here is to expose a set of "virtual widgets" that can be used with a `Virtual` widget and its `virtual::State`. A virtual widget is a widget that does not contain any state, but instead is a "virtual" representation of the "real" widget. The real widgets are stored in the `virtual::State`. Every time a new virtual widget tree is created during `view`, it is compared to the previous one and "real" widgets are added / removed to the `virtual::State`. Effectively, this removes the need to keep track of local widget state in the application state and allows `view` to take an immutable reference to `self`. To summarize, using this crate should allow users to remove `State` structs in their application state. Eventually, the strategy used here may be adopted generally and, as a result, all of the widgets in `iced_native` would be replaced!
52 lines
1.1 KiB
Rust
52 lines
1.1 KiB
Rust
mod button;
|
|
|
|
pub use button::Button;
|
|
|
|
use iced_native::layout::{self, Layout};
|
|
use iced_native::renderer;
|
|
use iced_native::{Hasher, Length, Point, Rectangle};
|
|
|
|
pub trait Widget<Message, Renderer> {}
|
|
|
|
pub(crate) enum Tree<Message, Renderer> {
|
|
Node {
|
|
widget: Box<dyn Widget<Message, Renderer>>,
|
|
children: Vec<Tree<Message, Renderer>>,
|
|
},
|
|
Leaf {
|
|
widget: Box<dyn Widget<Message, Renderer>>,
|
|
},
|
|
}
|
|
|
|
impl<Message, Renderer> Tree<Message, Renderer> {
|
|
pub fn width(&self) -> Length {
|
|
unimplemented! {}
|
|
}
|
|
|
|
pub fn height(&self) -> Length {
|
|
unimplemented! {}
|
|
}
|
|
|
|
pub fn hash_layout(&self, state: &mut Hasher) {
|
|
unimplemented! {}
|
|
}
|
|
|
|
pub fn layout(
|
|
&self,
|
|
renderer: &Renderer,
|
|
limits: &layout::Limits,
|
|
) -> layout::Node {
|
|
unimplemented! {}
|
|
}
|
|
|
|
pub fn draw(
|
|
&self,
|
|
renderer: &mut Renderer,
|
|
style: &renderer::Style,
|
|
layout: Layout<'_>,
|
|
cursor_position: Point,
|
|
viewport: &Rectangle,
|
|
) {
|
|
unimplemented! {}
|
|
}
|
|
}
|