kobold 0.9.1

Easy declarative web interfaces
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

/// Describes whether or not a component should be rendered after state changes.
/// For uses see:
///
/// * [`Hook::bind`](crate::stateful::Hook::bind)
/// * [`IntoState::update`](crate::stateful::IntoState::update)
pub trait ShouldRender: 'static {
    fn should_render(self) -> bool;
}

/// Closures without return type always update their view.
impl ShouldRender for () {
    fn should_render(self) -> bool {
        true
    }
}

/// An enum that implements the [`ShouldRender`](ShouldRender) trait.
/// See:
///
/// * [`Hook::bind`](crate::stateful::Hook::bind)
/// * [`IntoState::update`](crate::stateful::IntoState::update)
pub enum Then {
    /// This is a silent update
    Stop,
    /// Render the view after this update
    Render,
}

impl ShouldRender for Then {
    fn should_render(self) -> bool {
        match self {
            Then::Stop => false,
            Then::Render => true,
        }
    }
}