diff options
Diffstat (limited to 'src/widget/slider.rs')
| -rw-r--r-- | src/widget/slider.rs | 241 |
1 files changed, 0 insertions, 241 deletions
diff --git a/src/widget/slider.rs b/src/widget/slider.rs deleted file mode 100644 index cdec9ec4..00000000 --- a/src/widget/slider.rs +++ /dev/null @@ -1,241 +0,0 @@ -//! 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 std::ops::RangeInclusive; - -use crate::input::{mouse, ButtonState}; -use crate::{ - Element, Event, Hasher, Layout, MouseCursor, Node, Point, Rectangle, Style, - Widget, -}; - -/// An horizontal bar and a handle that selects a single value from a range of -/// values. -/// -/// A [`Slider`] will try to fill the horizontal space of its container. -/// -/// It implements [`Widget`] when the associated `Renderer` implements the -/// [`slider::Renderer`] trait. -/// -/// [`Slider`]: struct.Slider.html -/// [`Widget`]: ../trait.Widget.html -/// [`slider::Renderer`]: trait.Renderer.html -/// -/// # Example -/// ``` -/// use iced::{slider, Slider}; -/// -/// pub enum Message { -/// SliderChanged(f32), -/// } -/// -/// let state = &mut slider::State::new(); -/// let value = 50.0; -/// -/// Slider::new(state, 0.0..=100.0, value, Message::SliderChanged); -/// ``` -/// -///  -pub struct Slider<'a, Message> { - state: &'a mut State, - range: RangeInclusive<f32>, - value: f32, - on_change: Box<dyn Fn(f32) -> Message>, - style: Style, -} - -impl<'a, Message> std::fmt::Debug for Slider<'a, Message> { - fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { - f.debug_struct("Slider") - .field("state", &self.state) - .field("range", &self.range) - .field("value", &self.value) - .field("style", &self.style) - .finish() - } -} - -impl<'a, Message> Slider<'a, Message> { - /// Creates a new [`Slider`]. - /// - /// It expects: - /// * the local [`State`] of the [`Slider`] - /// * an inclusive range of possible values - /// * the current value of the [`Slider`] - /// * a function that will be called when the [`Slider`] is dragged. - /// It receives the new value of the [`Slider`] and must produce a - /// `Message`. - /// - /// [`Slider`]: struct.Slider.html - /// [`State`]: struct.State.html - pub fn new<F>( - state: &'a mut State, - range: RangeInclusive<f32>, - value: f32, - on_change: F, - ) -> Self - where - F: 'static + Fn(f32) -> Message, - { - Slider { - state, - value: value.max(*range.start()).min(*range.end()), - range, - on_change: Box::new(on_change), - style: Style::default().min_width(100).fill_width(), - } - } - - /// Sets the width of the [`Slider`] in pixels. - /// - /// [`Slider`]: struct.Slider.html - pub fn width(mut self, width: u16) -> Self { - self.style = self.style.width(width); - self - } -} - -impl<'a, Message, Renderer> Widget<Message, Renderer> for Slider<'a, Message> -where - Renderer: self::Renderer, -{ - fn node(&self, _renderer: &Renderer) -> Node { - Node::new(self.style.height(25)) - } - - 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, - ) -> MouseCursor { - renderer.draw( - cursor_position, - layout.bounds(), - self.state, - self.range.clone(), - self.value, - ) - } - - fn hash_layout(&self, state: &mut Hasher) { - self.style.hash(state); - } -} - -/// The local state of a [`Slider`]. -/// -/// [`Slider`]: struct.Slider.html -#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)] -pub struct State { - is_dragging: bool, -} - -impl State { - /// Creates a new [`State`]. - /// - /// [`State`]: struct.State.html - pub fn new() -> State { - State::default() - } - - /// Returns whether the associated [`Slider`] is currently being dragged or - /// not. - /// - /// [`Slider`]: struct.Slider.html - pub fn is_dragging(&self) -> bool { - self.is_dragging - } -} - -/// 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 { - /// 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( - &mut self, - cursor_position: Point, - bounds: Rectangle, - state: &State, - range: RangeInclusive<f32>, - value: f32, - ) -> MouseCursor; -} - -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) - } -} |