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//! Show toggle controls using checkboxes.
use std::hash::Hash;
use crate::input::{mouse, ButtonState};
use crate::{layout, Element, Event, Hasher, Layout, Length, Point, Widget};
pub use iced_core::Checkbox;
impl<Message, Renderer> Widget<Message, Renderer> for Checkbox<Message>
where
Renderer: self::Renderer,
{
fn width(&self) -> Length {
Length::Fill
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
renderer.layout(&self, limits)
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<Message>,
_renderer: &Renderer,
) {
match event {
Event::Mouse(mouse::Event::Input {
button: mouse::Button::Left,
state: ButtonState::Pressed,
}) => {
let mouse_over = layout.bounds().contains(cursor_position);
if mouse_over {
messages.push((self.on_toggle)(!self.is_checked));
}
}
_ => {}
}
}
fn draw(
&self,
renderer: &mut Renderer,
layout: Layout<'_>,
cursor_position: Point,
) -> Renderer::Output {
renderer.draw(&self, layout, cursor_position)
}
fn hash_layout(&self, state: &mut Hasher) {
self.label.hash(state);
}
}
/// The renderer of a [`Checkbox`].
///
/// Your [renderer] will need to implement this trait before being
/// able to use a [`Checkbox`] in your user interface.
///
/// [`Checkbox`]: struct.Checkbox.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer {
/// Creates a [`Node`] for the provided [`Checkbox`].
///
/// [`Node`]: ../../struct.Node.html
/// [`Checkbox`]: struct.Checkbox.html
fn layout<Message>(
&self,
checkbox: &Checkbox<Message>,
limits: &layout::Limits,
) -> layout::Node;
/// Draws a [`Checkbox`].
///
/// It receives:
/// * the current cursor position
/// * the bounds of the [`Checkbox`]
/// * the bounds of the label of the [`Checkbox`]
/// * whether the [`Checkbox`] is checked or not
///
/// [`Checkbox`]: struct.Checkbox.html
fn draw<Message>(
&mut self,
checkbox: &Checkbox<Message>,
layout: Layout<'_>,
cursor_position: Point,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Checkbox<Message>>
for Element<'a, Message, Renderer>
where
Renderer: self::Renderer,
Message: 'static,
{
fn from(checkbox: Checkbox<Message>) -> Element<'a, Message, Renderer> {
Element::new(checkbox)
}
}
|
