use std::hash::Hash;
use crate::{
layout, mouse, row, text, Align, Clipboard, Element, Event, Hasher,
HorizontalAlignment, Layout, Length, Point, Rectangle, Row, Text,
VerticalAlignment, Widget,
};
#[allow(missing_debug_implementations)]
pub struct Checkbox<Message, Renderer: self::Renderer + text::Renderer> {
is_checked: bool,
on_toggle: Box<dyn Fn(bool) -> Message>,
label: String,
width: Length,
size: u16,
spacing: u16,
text_size: Option<u16>,
font: Renderer::Font,
style: Renderer::Style,
}
impl<Message, Renderer: self::Renderer + text::Renderer>
Checkbox<Message, Renderer>
{
pub fn new<F>(is_checked: bool, label: impl Into<String>, f: F) -> Self
where
F: 'static + Fn(bool) -> Message,
{
Checkbox {
is_checked,
on_toggle: Box::new(f),
label: label.into(),
width: Length::Shrink,
size: <Renderer as self::Renderer>::DEFAULT_SIZE,
spacing: Renderer::DEFAULT_SPACING,
text_size: None,
font: Renderer::Font::default(),
style: Renderer::Style::default(),
}
}
pub fn size(mut self, size: u16) -> Self {
self.size = size;
self
}
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
pub fn spacing(mut self, spacing: u16) -> Self {
self.spacing = spacing;
self
}
pub fn text_size(mut self, text_size: u16) -> Self {
self.text_size = Some(text_size);
self
}
pub fn font(mut self, font: Renderer::Font) -> Self {
self.font = font;
self
}
pub fn style(mut self, style: impl Into<Renderer::Style>) -> Self {
self.style = style.into();
self
}
}
impl<Message, Renderer> Widget<Message, Renderer>
for Checkbox<Message, Renderer>
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 {
Row::<(), Renderer>::new()
.width(self.width)
.spacing(self.spacing)
.align_items(Align::Center)
.push(
Row::new()
.width(Length::Units(self.size))
.height(Length::Units(self.size)),
)
.push(
Text::new(&self.label)
.font(self.font)
.width(self.width)
.size(self.text_size.unwrap_or(renderer.default_size())),
)
.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::ButtonPressed(mouse::Button::Left)) => {
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,
defaults: &Renderer::Defaults,
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,
defaults,
label_layout.bounds(),
&self.label,
self.text_size.unwrap_or(renderer.default_size()),
self.font,
None,
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,
&self.style,
)
}
fn hash_layout(&self, state: &mut Hasher) {
struct Marker;
std::any::TypeId::of::<Marker>().hash(state);
self.label.hash(state);
}
}
pub trait Renderer: crate::Renderer {
type Style: Default;
const DEFAULT_SIZE: u16;
const DEFAULT_SPACING: u16;
fn draw(
&mut self,
bounds: Rectangle,
is_checked: bool,
is_mouse_over: bool,
label: Self::Output,
style: &Self::Style,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Checkbox<Message, Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: 'a + self::Renderer + text::Renderer + row::Renderer,
Message: 'a,
{
fn from(
checkbox: Checkbox<Message, Renderer>,
) -> Element<'a, Message, Renderer> {
Element::new(checkbox)
}
}