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//! Allow your users to perform actions by pressing a button.
//!
//! A [`Button`] has some local [`State`] and a [`Class`].
//!
//! [`Button`]: struct.Button.html
//! [`State`]: struct.State.html
//! [`Class`]: enum.Class.html
use crate::input::{mouse, ButtonState};
use crate::{layout, Element, Event, Hasher, Layout, Point, Widget};
use std::hash::Hash;
pub use iced_core::button::State;
pub type Button<'a, Message, Renderer> =
iced_core::Button<'a, Message, Element<'a, Message, Renderer>>;
impl<'a, Message, Renderer> Widget<Message, Renderer>
for Button<'a, Message, Renderer>
where
Renderer: self::Renderer,
Message: Clone + std::fmt::Debug,
{
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,
}) => {
if let Some(on_press) = self.on_press.clone() {
let bounds = layout.bounds();
match state {
ButtonState::Pressed => {
self.state.is_pressed =
bounds.contains(cursor_position);
}
ButtonState::Released => {
let is_clicked = self.state.is_pressed
&& bounds.contains(cursor_position);
self.state.is_pressed = false;
if is_clicked {
messages.push(on_press);
}
}
}
}
}
_ => {}
}
}
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.width.hash(state);
self.content.hash_layout(state);
}
}
/// The renderer of a [`Button`].
///
/// Your [renderer] will need to implement this trait before being
/// able to use a [`Button`] in your user interface.
///
/// [`Button`]: struct.Button.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer + Sized {
/// Creates a [`Node`] for the provided [`Button`].
///
/// [`Node`]: ../../struct.Node.html
/// [`Button`]: struct.Button.html
fn layout<Message>(
&self,
button: &Button<'_, Message, Self>,
limits: &layout::Limits,
) -> layout::Node;
/// Draws a [`Button`].
///
/// [`Button`]: struct.Button.html
fn draw<Message>(
&mut self,
button: &Button<'_, Message, Self>,
layout: Layout<'_>,
cursor_position: Point,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Button<'a, Message, Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: 'static + self::Renderer,
Message: 'static + Clone + std::fmt::Debug,
{
fn from(
button: Button<'a, Message, Renderer>,
) -> Element<'a, Message, Renderer> {
Element::new(button)
}
}
|
