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|
//! Allow your users to perform actions by pressing a button.
//!
//! A [`Button`] has some local [`State`].
//!
//! [`Button`]: struct.Button.html
//! [`State`]: struct.State.html
use crate::{css, Background, Bus, Css, Element, Length, Widget};
use dodrio::bumpalo;
/// A generic widget that produces a message when pressed.
///
/// ```
/// # use iced_web::{button, Button, Text};
/// #
/// enum Message {
/// ButtonPressed,
/// }
///
/// let mut state = button::State::new();
/// let button = Button::new(&mut state, Text::new("Press me!"))
/// .on_press(Message::ButtonPressed);
/// ```
#[allow(missing_debug_implementations)]
pub struct Button<'a, Message> {
content: Element<'a, Message>,
on_press: Option<Message>,
width: Length,
min_width: u32,
padding: u16,
background: Option<Background>,
border_radius: u16,
}
impl<'a, Message> Button<'a, Message> {
/// Creates a new [`Button`] with some local [`State`] and the given
/// content.
///
/// [`Button`]: struct.Button.html
/// [`State`]: struct.State.html
pub fn new<E>(_state: &'a mut State, content: E) -> Self
where
E: Into<Element<'a, Message>>,
{
Button {
content: content.into(),
on_press: None,
width: Length::Shrink,
min_width: 0,
padding: 0,
background: None,
border_radius: 0,
}
}
/// Sets the width of the [`Button`].
///
/// [`Button`]: struct.Button.html
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
/// Sets the minimum width of the [`Button`].
///
/// [`Button`]: struct.Button.html
pub fn min_width(mut self, min_width: u32) -> Self {
self.min_width = min_width;
self
}
/// Sets the padding of the [`Button`].
///
/// [`Button`]: struct.Button.html
pub fn padding(mut self, padding: u16) -> Self {
self.padding = padding;
self
}
/// Sets the [`Background`] of the [`Button`].
///
/// [`Button`]: struct.Button.html
/// [`Background`]: ../../struct.Background.html
pub fn background<T: Into<Background>>(mut self, background: T) -> Self {
self.background = Some(background.into());
self
}
/// Sets the border radius of the [`Button`].
///
/// [`Button`]: struct.Button.html
pub fn border_radius(mut self, border_radius: u16) -> Self {
self.border_radius = border_radius;
self
}
/// Sets the message that will be produced when the [`Button`] is pressed.
///
/// [`Button`]: struct.Button.html
pub fn on_press(mut self, msg: Message) -> Self {
self.on_press = Some(msg);
self
}
}
/// The local state of a [`Button`].
///
/// [`Button`]: struct.Button.html
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct State;
impl State {
/// Creates a new [`State`].
///
/// [`State`]: struct.State.html
pub fn new() -> State {
State::default()
}
}
impl<'a, Message> Widget<Message> for Button<'a, Message>
where
Message: 'static + Clone,
{
fn node<'b>(
&self,
bump: &'b bumpalo::Bump,
bus: &Bus<Message>,
style_sheet: &mut Css<'b>,
) -> dodrio::Node<'b> {
use dodrio::builder::*;
let width = css::length(self.width);
let padding_class =
style_sheet.insert(bump, css::Rule::Padding(self.padding));
let background = match self.background {
None => String::from("none"),
Some(background) => match background {
Background::Color(color) => css::color(color),
},
};
let mut node = button(bump)
.attr(
"class",
bumpalo::format!(in bump, "{}", padding_class).into_bump_str(),
)
.attr(
"style",
bumpalo::format!(
in bump,
"background: {}; border-radius: {}px; width:{}; min-width: {}px",
background,
self.border_radius,
width,
self.min_width
)
.into_bump_str(),
)
.children(vec![self.content.node(bump, bus, style_sheet)]);
if let Some(on_press) = self.on_press.clone() {
let event_bus = bus.clone();
node = node.on("click", move |_root, _vdom, _event| {
event_bus.publish(on_press.clone());
});
}
// TODO: Complete styling
node.finish()
}
}
impl<'a, Message> From<Button<'a, Message>> for Element<'a, Message>
where
Message: 'static + Clone,
{
fn from(button: Button<'a, Message>) -> Element<'a, Message> {
Element::new(button)
}
}
|
