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|
//! Show toggle controls using checkboxes.
use std::hash::Hash;
use crate::{
input::{mouse, ButtonState},
layout, row, text, Align, Clipboard, Color, Element, Event, Font, Hasher,
HorizontalAlignment, Layout, Length, Point, Rectangle, Row, Text,
VerticalAlignment, Widget,
};
/// A box that can be checked.
///
/// # Example
///
/// ```
/// # use iced_native::Checkbox;
/// #
/// pub enum Message {
/// CheckboxToggled(bool),
/// }
///
/// let is_checked = true;
///
/// Checkbox::new(is_checked, "Toggle me!", Message::CheckboxToggled);
/// ```
///
/// 
#[allow(missing_debug_implementations)]
pub struct Checkbox<Message> {
is_checked: bool,
on_toggle: Box<dyn Fn(bool) -> Message>,
label: String,
label_color: Option<Color>,
width: Length,
}
impl<Message> Checkbox<Message> {
/// Creates a new [`Checkbox`].
///
/// It expects:
/// * a boolean describing whether the [`Checkbox`] is checked or not
/// * the label of the [`Checkbox`]
/// * a function that will be called when the [`Checkbox`] is toggled. It
/// will receive the new state of the [`Checkbox`] and must produce a
/// `Message`.
///
/// [`Checkbox`]: struct.Checkbox.html
pub fn new<F>(is_checked: bool, label: &str, f: F) -> Self
where
F: 'static + Fn(bool) -> Message,
{
Checkbox {
is_checked,
on_toggle: Box::new(f),
label: String::from(label),
label_color: None,
width: Length::Fill,
}
}
/// Sets the color of the label of the [`Checkbox`].
///
/// [`Checkbox`]: struct.Checkbox.html
pub fn label_color<C: Into<Color>>(mut self, color: C) -> Self {
self.label_color = Some(color.into());
self
}
/// Sets the width of the [`Checkbox`].
///
/// [`Checkbox`]: struct.Checkbox.html
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for Checkbox<Message>
where
Renderer: self::Renderer + text::Renderer + row::Renderer,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
Length::Shrink
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let size = self::Renderer::default_size(renderer);
Row::<(), Renderer>::new()
.width(self.width)
.spacing(15)
.align_items(Align::Center)
.push(
Row::new()
.width(Length::Units(size as u16))
.height(Length::Units(size as u16)),
)
.push(Text::new(&self.label).width(self.width))
.layout(renderer, limits)
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<Message>,
_renderer: &Renderer,
_clipboard: Option<&dyn Clipboard>,
) {
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 {
let bounds = layout.bounds();
let mut children = layout.children();
let checkbox_layout = children.next().unwrap();
let label_layout = children.next().unwrap();
let checkbox_bounds = checkbox_layout.bounds();
let label = text::Renderer::draw(
renderer,
label_layout.bounds(),
&self.label,
text::Renderer::default_size(renderer),
Font::Default,
self.label_color,
HorizontalAlignment::Left,
VerticalAlignment::Center,
);
let is_mouse_over = bounds.contains(cursor_position);
self::Renderer::draw(
renderer,
checkbox_bounds,
self.is_checked,
is_mouse_over,
label,
)
}
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 {
/// Returns the default size of a [`Checkbox`].
///
/// [`Checkbox`]: struct.Checkbox.html
fn default_size(&self) -> u32;
/// Draws a [`Checkbox`].
///
/// It receives:
/// * the bounds of the [`Checkbox`]
/// * whether the [`Checkbox`] is selected or not
/// * whether the mouse is over the [`Checkbox`] or not
/// * the drawn label of the [`Checkbox`]
///
/// [`Checkbox`]: struct.Checkbox.html
fn draw(
&mut self,
bounds: Rectangle,
is_checked: bool,
is_mouse_over: bool,
label: Self::Output,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Checkbox<Message>>
for Element<'a, Message, Renderer>
where
Renderer: self::Renderer + text::Renderer + row::Renderer,
Message: 'static,
{
fn from(checkbox: Checkbox<Message>) -> Element<'a, Message, Renderer> {
Element::new(checkbox)
}
}
|
