435 lines
12 KiB
Rust
435 lines
12 KiB
Rust
//! Create choices using radio buttons.
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use crate::{Theme, theme};
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use iced::border;
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use iced_core::event::{self, Event};
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use iced_core::layout;
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use iced_core::mouse;
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use iced_core::overlay;
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use iced_core::renderer;
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use iced_core::touch;
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use iced_core::widget::tree::Tree;
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use iced_core::{
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Border, Clipboard, Element, Layout, Length, Pixels, Rectangle, Shell, Size, Vector, Widget,
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};
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use iced_widget::radio as iced_radio;
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pub use iced_widget::radio::Catalog;
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pub fn radio<'a, Message: Clone, V, F>(
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label: impl Into<Element<'a, Message, Theme, crate::Renderer>>,
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value: V,
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selected: Option<V>,
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f: F,
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) -> Radio<'a, Message, crate::Renderer>
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where
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V: Eq + Copy,
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F: FnOnce(V) -> Message,
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{
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Radio::new(label, value, selected, f)
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}
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/// A circular button representing a choice.
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///
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/// # Example
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/// ```no_run
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/// # type Radio<'a, Message> =
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/// # cosmic::widget::Radio<'a, Message, cosmic::Renderer>;
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/// #
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/// # use cosmic::widget::text;
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/// # use cosmic::iced::widget::column;
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/// #[derive(Debug, Clone, Copy, PartialEq, Eq)]
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/// pub enum Choice {
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/// A,
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/// B,
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/// C,
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/// All,
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/// }
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///
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/// #[derive(Debug, Clone, Copy)]
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/// pub enum Message {
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/// RadioSelected(Choice),
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/// }
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///
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/// let selected_choice = Some(Choice::A);
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///
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/// let a = Radio::new(
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/// text::heading("A"),
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/// Choice::A,
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/// selected_choice,
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/// Message::RadioSelected,
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/// );
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///
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/// let b = Radio::new(
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/// text::heading("B"),
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/// Choice::B,
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/// selected_choice,
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/// Message::RadioSelected,
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/// );
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///
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/// let c = Radio::new(
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/// text::heading("C"),
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/// Choice::C,
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/// selected_choice,
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/// Message::RadioSelected,
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/// );
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///
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/// let all = Radio::new(
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/// column![
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/// text::heading("All"),
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/// text::body("A, B and C"),
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/// ],
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/// Choice::All,
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/// selected_choice,
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/// Message::RadioSelected
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/// );
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///
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/// let content = column![a, b, c, all];
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/// ```
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#[allow(missing_debug_implementations)]
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pub struct Radio<'a, Message, Renderer = crate::Renderer>
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where
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Renderer: iced_core::Renderer,
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{
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is_selected: bool,
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on_click: Message,
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label: Option<Element<'a, Message, Theme, Renderer>>,
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width: Length,
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size: f32,
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spacing: f32,
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}
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impl<'a, Message, Renderer> Radio<'a, Message, Renderer>
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where
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Message: Clone,
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Renderer: iced_core::Renderer,
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{
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/// The default size of a [`Radio`] button.
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pub const DEFAULT_SIZE: f32 = 16.0;
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/// Creates a new [`Radio`] button.
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///
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/// It expects:
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/// * the value related to the [`Radio`] button
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/// * the label of the [`Radio`] button
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/// * the current selected value
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/// * a function that will be called when the [`Radio`] is selected. It
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/// receives the value of the radio and must produce a `Message`.
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pub fn new<T, F, V>(label: T, value: V, selected: Option<V>, f: F) -> Self
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where
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V: Eq + Copy,
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F: FnOnce(V) -> Message,
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T: Into<Element<'a, Message, Theme, Renderer>>,
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{
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Radio {
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is_selected: Some(value) == selected,
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on_click: f(value),
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label: Some(label.into()),
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width: Length::Shrink,
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size: Self::DEFAULT_SIZE,
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spacing: theme::spacing().space_xs as f32,
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}
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}
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/// Creates a new [`Radio`] button without a label.
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///
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/// This is intended for internal use with the settings item builder,
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/// where the label comes from the settings item title instead.
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pub(crate) fn new_no_label<V, F>(value: V, selected: Option<V>, f: F) -> Self
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where
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V: Eq + Copy,
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F: FnOnce(V) -> Message,
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{
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Radio {
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is_selected: Some(value) == selected,
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on_click: f(value),
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label: None,
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width: Length::Shrink,
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size: Self::DEFAULT_SIZE,
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spacing: theme::spacing().space_xs as f32,
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}
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}
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#[must_use]
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/// Sets the size of the [`Radio`] button.
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pub fn size(mut self, size: impl Into<Pixels>) -> Self {
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self.size = size.into().0;
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self
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}
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#[must_use]
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/// Sets the width of the [`Radio`] button.
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pub fn width(mut self, width: impl Into<Length>) -> Self {
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self.width = width.into();
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self
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}
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#[must_use]
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/// Sets the spacing between the [`Radio`] button and the text.
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pub fn spacing(mut self, spacing: impl Into<Pixels>) -> Self {
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self.spacing = spacing.into().0;
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self
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}
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}
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impl<Message, Renderer> Widget<Message, Theme, Renderer> for Radio<'_, Message, Renderer>
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where
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Message: Clone,
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Renderer: iced_core::Renderer,
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{
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fn children(&self) -> Vec<Tree> {
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if let Some(label) = &self.label {
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vec![Tree::new(label)]
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} else {
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vec![]
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}
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}
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fn diff(&mut self, tree: &mut Tree) {
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if let Some(label) = &mut self.label {
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tree.diff_children(std::slice::from_mut(label));
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}
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}
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fn size(&self) -> Size<Length> {
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Size {
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width: self.width,
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height: Length::Shrink,
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}
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}
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fn layout(
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&mut self,
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tree: &mut Tree,
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renderer: &Renderer,
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limits: &layout::Limits,
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) -> layout::Node {
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if let Some(label) = &mut self.label {
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layout::next_to_each_other(
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&limits.width(self.width),
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self.spacing,
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|_| layout::Node::new(Size::new(self.size, self.size)),
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|limits| {
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label
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.as_widget_mut()
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.layout(&mut tree.children[0], renderer, limits)
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},
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)
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} else {
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layout::Node::new(Size::new(self.size, self.size))
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}
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}
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fn operate(
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&mut self,
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tree: &mut Tree,
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layout: Layout<'_>,
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renderer: &Renderer,
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operation: &mut dyn iced_core::widget::Operation<()>,
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) {
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if let Some(label) = &mut self.label {
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label.as_widget_mut().operate(
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&mut tree.children[0],
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layout.children().nth(1).unwrap(),
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renderer,
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operation,
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);
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}
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}
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fn update(
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&mut self,
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tree: &mut Tree,
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event: &Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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renderer: &Renderer,
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clipboard: &mut dyn Clipboard,
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shell: &mut Shell<'_, Message>,
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viewport: &Rectangle,
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) {
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if let Some(label) = &mut self.label {
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label.as_widget_mut().update(
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&mut tree.children[0],
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event,
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layout.children().nth(1).unwrap(),
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cursor,
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renderer,
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clipboard,
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shell,
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viewport,
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);
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}
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if !shell.is_event_captured() {
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match event {
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Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left))
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| Event::Touch(touch::Event::FingerLifted { .. }) => {
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if cursor.is_over(layout.bounds()) {
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shell.publish(self.on_click.clone());
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shell.capture_event();
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return;
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}
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}
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_ => {}
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}
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}
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}
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fn mouse_interaction(
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&self,
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tree: &Tree,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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renderer: &Renderer,
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) -> mouse::Interaction {
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let interaction = if let Some(label) = &self.label {
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label.as_widget().mouse_interaction(
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&tree.children[0],
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layout.children().nth(1).unwrap(),
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cursor,
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viewport,
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renderer,
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)
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} else {
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mouse::Interaction::default()
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};
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if interaction == mouse::Interaction::default() {
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if cursor.is_over(layout.bounds()) {
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mouse::Interaction::Pointer
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} else {
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mouse::Interaction::default()
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}
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} else {
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interaction
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}
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}
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fn draw(
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&self,
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tree: &Tree,
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renderer: &mut Renderer,
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theme: &Theme,
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style: &renderer::Style,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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) {
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let is_mouse_over = cursor.is_over(layout.bounds());
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let custom_style = if is_mouse_over {
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theme.style(
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&(),
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iced_radio::Status::Hovered {
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is_selected: self.is_selected,
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},
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)
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} else {
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theme.style(
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&(),
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iced_radio::Status::Active {
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is_selected: self.is_selected,
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},
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)
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};
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let (dot_bounds, label_layout) = if self.label.is_some() {
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let mut children = layout.children();
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let dot_bounds = children.next().unwrap().bounds();
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(dot_bounds, children.next())
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} else {
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(layout.bounds(), None)
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};
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{
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let size = dot_bounds.width;
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let dot_size = 6.0;
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renderer.fill_quad(
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renderer::Quad {
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bounds: dot_bounds,
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border: Border {
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radius: (size / 2.0).into(),
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width: custom_style.border_width,
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color: custom_style.border_color,
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},
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..renderer::Quad::default()
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},
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custom_style.background,
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);
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if self.is_selected {
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renderer.fill_quad(
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renderer::Quad {
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bounds: Rectangle {
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x: dot_bounds.x + (size - dot_size) / 2.0,
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y: dot_bounds.y + (size - dot_size) / 2.0,
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width: dot_size,
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height: dot_size,
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},
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border: border::rounded(dot_size / 2.0),
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..renderer::Quad::default()
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},
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custom_style.dot_color,
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);
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}
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}
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if let (Some(label), Some(label_layout)) = (&self.label, label_layout) {
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label.as_widget().draw(
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&tree.children[0],
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renderer,
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theme,
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style,
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label_layout,
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cursor,
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viewport,
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);
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}
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}
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fn overlay<'b>(
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&'b mut self,
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tree: &'b mut Tree,
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layout: Layout<'b>,
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renderer: &Renderer,
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viewport: &Rectangle,
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translation: Vector,
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) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
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self.label.as_mut()?.as_widget_mut().overlay(
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&mut tree.children[0],
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layout.children().nth(1).unwrap(),
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renderer,
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viewport,
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translation,
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)
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}
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fn drag_destinations(
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&self,
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state: &Tree,
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layout: Layout<'_>,
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renderer: &Renderer,
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dnd_rectangles: &mut iced_core::clipboard::DndDestinationRectangles,
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) {
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if let Some(label) = &self.label {
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label.as_widget().drag_destinations(
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&state.children[0],
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layout.children().nth(1).unwrap(),
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renderer,
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dnd_rectangles,
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);
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}
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}
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}
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impl<'a, Message, Renderer> From<Radio<'a, Message, Renderer>>
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for Element<'a, Message, Theme, Renderer>
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where
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Message: 'a + Clone,
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Renderer: 'a + iced_core::Renderer,
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{
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fn from(radio: Radio<'a, Message, Renderer>) -> Element<'a, Message, Theme, Renderer> {
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Element::new(radio)
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}
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}
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