use crate::core::alignment;
use crate::core::event::{self, Event};
use crate::core::layout;
use crate::core::mouse;
use crate::core::renderer;
use crate::core::text;
use crate::core::theme::palette;
use crate::core::touch;
use crate::core::widget;
use crate::core::widget::tree::{self, Tree};
use crate::core::{
Background, Border, Clipboard, Color, Element, Layout, Length, Pixels,
Rectangle, Shell, Size, Theme, Widget,
};
#[allow(missing_debug_implementations)]
pub struct Checkbox<
'a,
Message,
Theme = crate::Theme,
Renderer = crate::Renderer,
> where
Renderer: text::Renderer,
Theme: Catalog,
{
is_checked: bool,
on_toggle: Option<Box<dyn Fn(bool) -> Message + 'a>>,
label: String,
width: Length,
size: f32,
spacing: f32,
text_size: Option<Pixels>,
text_line_height: text::LineHeight,
text_shaping: text::Shaping,
font: Option<Renderer::Font>,
icon: Icon<Renderer::Font>,
class: Theme::Class<'a>,
}
impl<'a, Message, Theme, Renderer> Checkbox<'a, Message, Theme, Renderer>
where
Renderer: text::Renderer,
Theme: Catalog,
{
const DEFAULT_SIZE: f32 = 16.0;
const DEFAULT_SPACING: f32 = 8.0;
pub fn new(label: impl Into<String>, is_checked: bool) -> Self {
Checkbox {
is_checked,
on_toggle: None,
label: label.into(),
width: Length::Shrink,
size: Self::DEFAULT_SIZE,
spacing: Self::DEFAULT_SPACING,
text_size: None,
text_line_height: text::LineHeight::default(),
text_shaping: text::Shaping::Basic,
font: None,
icon: Icon {
font: Renderer::ICON_FONT,
code_point: Renderer::CHECKMARK_ICON,
size: None,
line_height: text::LineHeight::default(),
shaping: text::Shaping::Basic,
},
class: Theme::default(),
}
}
pub fn on_toggle<F>(mut self, f: F) -> Self
where
F: 'a + Fn(bool) -> Message,
{
self.on_toggle = Some(Box::new(f));
self
}
pub fn on_toggle_maybe<F>(mut self, f: Option<F>) -> Self
where
F: Fn(bool) -> Message + 'a,
{
self.on_toggle = f.map(|f| Box::new(f) as _);
self
}
pub fn size(mut self, size: impl Into<Pixels>) -> Self {
self.size = size.into().0;
self
}
pub fn width(mut self, width: impl Into<Length>) -> Self {
self.width = width.into();
self
}
pub fn spacing(mut self, spacing: impl Into<Pixels>) -> Self {
self.spacing = spacing.into().0;
self
}
pub fn text_size(mut self, text_size: impl Into<Pixels>) -> Self {
self.text_size = Some(text_size.into());
self
}
pub fn text_line_height(
mut self,
line_height: impl Into<text::LineHeight>,
) -> Self {
self.text_line_height = line_height.into();
self
}
pub fn text_shaping(mut self, shaping: text::Shaping) -> Self {
self.text_shaping = shaping;
self
}
pub fn font(mut self, font: impl Into<Renderer::Font>) -> Self {
self.font = Some(font.into());
self
}
pub fn icon(mut self, icon: Icon<Renderer::Font>) -> Self {
self.icon = icon;
self
}
#[must_use]
pub fn style(mut self, style: impl Fn(&Theme, Status) -> Style + 'a) -> Self
where
Theme::Class<'a>: From<StyleFn<'a, Theme>>,
{
self.class = (Box::new(style) as StyleFn<'a, Theme>).into();
self
}
#[cfg(feature = "advanced")]
#[must_use]
pub fn class(mut self, class: impl Into<Theme::Class<'a>>) -> Self {
self.class = class.into();
self
}
}
impl<'a, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
for Checkbox<'a, Message, Theme, Renderer>
where
Renderer: text::Renderer,
Theme: Catalog,
{
fn tag(&self) -> tree::Tag {
tree::Tag::of::<widget::text::State<Renderer::Paragraph>>()
}
fn state(&self) -> tree::State {
tree::State::new(widget::text::State::<Renderer::Paragraph>::default())
}
fn size(&self) -> Size<Length> {
Size {
width: self.width,
height: Length::Shrink,
}
}
fn layout(
&self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
layout::next_to_each_other(
&limits.width(self.width),
self.spacing,
|_| layout::Node::new(Size::new(self.size, self.size)),
|limits| {
let state = tree
.state
.downcast_mut::<widget::text::State<Renderer::Paragraph>>();
widget::text::layout(
state,
renderer,
limits,
self.width,
Length::Shrink,
&self.label,
self.text_line_height,
self.text_size,
self.font,
alignment::Horizontal::Left,
alignment::Vertical::Top,
self.text_shaping,
)
},
)
}
fn on_event(
&mut self,
_tree: &mut Tree,
event: Event,
layout: Layout<'_>,
cursor: mouse::Cursor,
_renderer: &Renderer,
_clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
_viewport: &Rectangle,
) -> event::Status {
match event {
Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
| Event::Touch(touch::Event::FingerPressed { .. }) => {
let mouse_over = cursor.is_over(layout.bounds());
if mouse_over {
if let Some(on_toggle) = &self.on_toggle {
shell.publish((on_toggle)(!self.is_checked));
return event::Status::Captured;
}
}
}
_ => {}
}
event::Status::Ignored
}
fn mouse_interaction(
&self,
_tree: &Tree,
layout: Layout<'_>,
cursor: mouse::Cursor,
_viewport: &Rectangle,
_renderer: &Renderer,
) -> mouse::Interaction {
if cursor.is_over(layout.bounds()) && self.on_toggle.is_some() {
mouse::Interaction::Pointer
} else {
mouse::Interaction::default()
}
}
fn draw(
&self,
tree: &Tree,
renderer: &mut Renderer,
theme: &Theme,
defaults: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
viewport: &Rectangle,
) {
let is_mouse_over = cursor.is_over(layout.bounds());
let is_disabled = self.on_toggle.is_none();
let is_checked = self.is_checked;
let mut children = layout.children();
let status = if is_disabled {
Status::Disabled { is_checked }
} else if is_mouse_over {
Status::Hovered { is_checked }
} else {
Status::Active { is_checked }
};
let style = theme.style(&self.class, status);
{
let layout = children.next().unwrap();
let bounds = layout.bounds();
renderer.fill_quad(
renderer::Quad {
bounds,
border: style.border,
..renderer::Quad::default()
},
style.background,
);
let Icon {
font,
code_point,
size,
line_height,
shaping,
} = &self.icon;
let size = size.unwrap_or(Pixels(bounds.height * 0.7));
if self.is_checked {
renderer.fill_text(
text::Text {
content: code_point.to_string(),
font: *font,
size,
line_height: *line_height,
bounds: bounds.size(),
horizontal_alignment: alignment::Horizontal::Center,
vertical_alignment: alignment::Vertical::Center,
shaping: *shaping,
},
bounds.center(),
style.icon_color,
*viewport,
);
}
}
{
let label_layout = children.next().unwrap();
crate::text::draw(
renderer,
defaults,
label_layout,
tree.state.downcast_ref(),
crate::text::Style {
color: style.text_color,
},
viewport,
);
}
}
}
impl<'a, Message, Theme, Renderer> From<Checkbox<'a, Message, Theme, Renderer>>
for Element<'a, Message, Theme, Renderer>
where
Message: 'a,
Theme: 'a + Catalog,
Renderer: 'a + text::Renderer,
{
fn from(
checkbox: Checkbox<'a, Message, Theme, Renderer>,
) -> Element<'a, Message, Theme, Renderer> {
Element::new(checkbox)
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct Icon<Font> {
pub font: Font,
pub code_point: char,
pub size: Option<Pixels>,
pub line_height: text::LineHeight,
pub shaping: text::Shaping,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Status {
Active {
is_checked: bool,
},
Hovered {
is_checked: bool,
},
Disabled {
is_checked: bool,
},
}
#[derive(Debug, Clone, Copy)]
pub struct Style {
pub background: Background,
pub icon_color: Color,
pub border: Border,
pub text_color: Option<Color>,
}
pub trait Catalog: Sized {
type Class<'a>;
fn default<'a>() -> Self::Class<'a>;
fn style(&self, class: &Self::Class<'_>, status: Status) -> Style;
}
pub type StyleFn<'a, Theme> = Box<dyn Fn(&Theme, Status) -> Style + 'a>;
impl Catalog for Theme {
type Class<'a> = StyleFn<'a, Self>;
fn default<'a>() -> Self::Class<'a> {
Box::new(primary)
}
fn style(&self, class: &Self::Class<'_>, status: Status) -> Style {
class(self, status)
}
}
pub fn primary(theme: &Theme, status: Status) -> Style {
let palette = theme.extended_palette();
match status {
Status::Active { is_checked } => styled(
palette.primary.strong.text,
palette.background.base,
palette.primary.strong,
is_checked,
),
Status::Hovered { is_checked } => styled(
palette.primary.strong.text,
palette.background.weak,
palette.primary.base,
is_checked,
),
Status::Disabled { is_checked } => styled(
palette.primary.strong.text,
palette.background.weak,
palette.background.strong,
is_checked,
),
}
}
pub fn secondary(theme: &Theme, status: Status) -> Style {
let palette = theme.extended_palette();
match status {
Status::Active { is_checked } => styled(
palette.background.base.text,
palette.background.base,
palette.background.strong,
is_checked,
),
Status::Hovered { is_checked } => styled(
palette.background.base.text,
palette.background.weak,
palette.background.strong,
is_checked,
),
Status::Disabled { is_checked } => styled(
palette.background.strong.color,
palette.background.weak,
palette.background.weak,
is_checked,
),
}
}
pub fn success(theme: &Theme, status: Status) -> Style {
let palette = theme.extended_palette();
match status {
Status::Active { is_checked } => styled(
palette.success.base.text,
palette.background.base,
palette.success.base,
is_checked,
),
Status::Hovered { is_checked } => styled(
palette.success.base.text,
palette.background.weak,
palette.success.base,
is_checked,
),
Status::Disabled { is_checked } => styled(
palette.success.base.text,
palette.background.weak,
palette.success.weak,
is_checked,
),
}
}
pub fn danger(theme: &Theme, status: Status) -> Style {
let palette = theme.extended_palette();
match status {
Status::Active { is_checked } => styled(
palette.danger.base.text,
palette.background.base,
palette.danger.base,
is_checked,
),
Status::Hovered { is_checked } => styled(
palette.danger.base.text,
palette.background.weak,
palette.danger.base,
is_checked,
),
Status::Disabled { is_checked } => styled(
palette.danger.base.text,
palette.background.weak,
palette.danger.weak,
is_checked,
),
}
}
fn styled(
icon_color: Color,
base: palette::Pair,
accent: palette::Pair,
is_checked: bool,
) -> Style {
Style {
background: Background::Color(if is_checked {
accent.color
} else {
base.color
}),
icon_color,
border: Border {
radius: 2.0.into(),
width: 1.0,
color: accent.color,
},
text_color: None,
}
}