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Use associated type for Message in a canvas::Program

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This commit is contained in:
Héctor Ramón Jiménez 2022-03-09 18:27:22 +07:00
parent 12c1a3f829
commit c52fd089f1
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GPG key ID: 140CC052C94F138E
7 changed files with 37 additions and 24 deletions
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15
graphics/src/widget/canvas/program.rs
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@ -8,7 +8,10 @@ use iced_native::{mouse, Rectangle};
/// application.
///
/// [`Canvas`]: crate::widget::Canvas
pub trait Program<Message> {
pub trait Program {
/// The [`Message`] produced by the [`Program`].
type Message;
/// Updates the state of the [`Program`].
///
/// When a [`Program`] is used in a [`Canvas`], the runtime will call this
@ -25,7 +28,7 @@ pub trait Program<Message> {
_event: Event,
_bounds: Rectangle,
_cursor: Cursor,
) -> (event::Status, Option<Message>) {
) -> (event::Status, Option<Self::Message>) {
(event::Status::Ignored, None)
}
@ -53,16 +56,18 @@ pub trait Program<Message> {
}
}
impl<T, Message> Program<Message> for &mut T
impl<T> Program for &mut T
where
T: Program<Message>,
T: Program,
{
type Message = T::Message;
fn update(
&mut self,
event: Event,
bounds: Rectangle,
cursor: Cursor,
) -> (event::Status, Option<Message>) {
) -> (event::Status, Option<Self::Message>) {
T::update(self, event, bounds, cursor)
}