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|
//! Display an interactive selector of a single value from a range of values.
//!
//! A [`Slider`] has some local [`State`].
//!
//! [`Slider`]: struct.Slider.html
//! [`State`]: struct.State.html
use std::hash::Hash;
use crate::input::{mouse, ButtonState};
use crate::{Element, Event, Hasher, Layout, Node, Point, Widget};
pub use iced_core::slider::*;
impl<'a, Message, Renderer> Widget<Message, Renderer> for Slider<'a, Message>
where
Renderer: self::Renderer,
{
fn node(&self, renderer: &Renderer) -> Node {
renderer.node(&self)
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<Message>,
) {
let mut change = || {
let bounds = layout.bounds();
if cursor_position.x <= bounds.x {
messages.push((self.on_change)(*self.range.start()));
} else if cursor_position.x >= bounds.x + bounds.width {
messages.push((self.on_change)(*self.range.end()));
} else {
let percent = (cursor_position.x - bounds.x) / bounds.width;
let value = (self.range.end() - self.range.start()) * percent
+ self.range.start();
messages.push((self.on_change)(value));
}
};
match event {
Event::Mouse(mouse::Event::Input {
button: mouse::Button::Left,
state,
}) => match state {
ButtonState::Pressed => {
if layout.bounds().contains(cursor_position) {
change();
self.state.is_dragging = true;
}
}
ButtonState::Released => {
self.state.is_dragging = false;
}
},
Event::Mouse(mouse::Event::CursorMoved { .. }) => {
if self.state.is_dragging {
change();
}
}
_ => {}
}
}
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);
}
}
/// The renderer of a [`Slider`].
///
/// Your [renderer] will need to implement this trait before being
/// able to use a [`Slider`] in your user interface.
///
/// [`Slider`]: struct.Slider.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer {
/// Creates a [`Node`] for the provided [`Radio`].
///
/// [`Node`]: ../../struct.Node.html
/// [`Radio`]: struct.Radio.html
fn node<Message>(&self, slider: &Slider<'_, Message>) -> Node;
/// Draws a [`Slider`].
///
/// It receives:
/// * the current cursor position
/// * the bounds of the [`Slider`]
/// * the local state of the [`Slider`]
/// * the range of values of the [`Slider`]
/// * the current value of the [`Slider`]
///
/// [`Slider`]: struct.Slider.html
/// [`State`]: struct.State.html
/// [`Class`]: enum.Class.html
fn draw<Message>(
&mut self,
slider: &Slider<'_, Message>,
layout: Layout<'_>,
cursor_position: Point,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Slider<'a, Message>>
for Element<'a, Message, Renderer>
where
Renderer: self::Renderer,
Message: 'static,
{
fn from(slider: Slider<'a, Message>) -> Element<'a, Message, Renderer> {
Element::new(slider)
}
}
|
