Create `iced_widget` subcrate and re-organize the whole codebase

1 files changed, 300 insertions, 0 deletions

diff --git a/widget/src/radio.rs b/widget/src/radio.rs
new file mode 100644
index 00000000..e5c67f3d
--- /dev/null
+++ b/widget/src/radio.rs
@@ -0,0 +1,300 @@
+//! Create choices using radio buttons.
+use crate::core::alignment;
+use crate::core::event::{self, Event};
+use crate::core::layout;
+use crate::core::mouse;
+use crate::core::renderer;
+use crate::core::text;
+use crate::core::touch;
+use crate::core::widget::Tree;
+use crate::core::{
+    Alignment, Clipboard, Color, Element, Layout, Length, Pixels, Point,
+    Rectangle, Shell, Widget,
+};
+use crate::{Row, Text};
+
+pub use iced_style::radio::{Appearance, StyleSheet};
+
+/// A circular button representing a choice.
+///
+/// # Example
+/// ```
+/// # type Radio<Message> =
+/// #     iced_widget::Radio<Message, iced_widget::renderer::Renderer<iced_widget::style::Theme>>;
+/// #
+/// #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+/// pub enum Choice {
+///     A,
+///     B,
+/// }
+///
+/// #[derive(Debug, Clone, Copy)]
+/// pub enum Message {
+///     RadioSelected(Choice),
+/// }
+///
+/// let selected_choice = Some(Choice::A);
+///
+/// Radio::new(Choice::A, "This is A", selected_choice, Message::RadioSelected);
+///
+/// Radio::new(Choice::B, "This is B", selected_choice, Message::RadioSelected);
+/// ```
+///
+/// ![Radio buttons drawn by `iced_wgpu`](https://github.com/iced-rs/iced/blob/7760618fb112074bc40b148944521f312152012a/docs/images/radio.png?raw=true)
+#[allow(missing_debug_implementations)]
+pub struct Radio<Message, Renderer = crate::Renderer>
+where
+    Renderer: text::Renderer,
+    Renderer::Theme: StyleSheet,
+{
+    is_selected: bool,
+    on_click: Message,
+    label: String,
+    width: Length,
+    size: f32,
+    spacing: f32,
+    text_size: Option<f32>,
+    font: Option<Renderer::Font>,
+    style: <Renderer::Theme as StyleSheet>::Style,
+}
+
+impl<Message, Renderer> Radio<Message, Renderer>
+where
+    Message: Clone,
+    Renderer: text::Renderer,
+    Renderer::Theme: StyleSheet,
+{
+    /// The default size of a [`Radio`] button.
+    pub const DEFAULT_SIZE: f32 = 28.0;
+
+    /// The default spacing of a [`Radio`] button.
+    pub const DEFAULT_SPACING: f32 = 15.0;
+
+    /// Creates a new [`Radio`] button.
+    ///
+    /// It expects:
+    ///   * the value related to the [`Radio`] button
+    ///   * the label of the [`Radio`] button
+    ///   * the current selected value
+    ///   * a function that will be called when the [`Radio`] is selected. It
+    ///   receives the value of the radio and must produce a `Message`.
+    pub fn new<F, V>(
+        value: V,
+        label: impl Into<String>,
+        selected: Option<V>,
+        f: F,
+    ) -> Self
+    where
+        V: Eq + Copy,
+        F: FnOnce(V) -> Message,
+    {
+        Radio {
+            is_selected: Some(value) == selected,
+            on_click: f(value),
+            label: label.into(),
+            width: Length::Shrink,
+            size: Self::DEFAULT_SIZE,
+            spacing: Self::DEFAULT_SPACING, //15
+            text_size: None,
+            font: None,
+            style: Default::default(),
+        }
+    }
+
+    /// Sets the size of the [`Radio`] button.
+    pub fn size(mut self, size: impl Into<Pixels>) -> Self {
+        self.size = size.into().0;
+        self
+    }
+
+    /// Sets the width of the [`Radio`] button.
+    pub fn width(mut self, width: impl Into<Length>) -> Self {
+        self.width = width.into();
+        self
+    }
+
+    /// Sets the spacing between the [`Radio`] button and the text.
+    pub fn spacing(mut self, spacing: impl Into<Pixels>) -> Self {
+        self.spacing = spacing.into().0;
+        self
+    }
+
+    /// Sets the text size of the [`Radio`] button.
+    pub fn text_size(mut self, text_size: impl Into<Pixels>) -> Self {
+        self.text_size = Some(text_size.into().0);
+        self
+    }
+
+    /// Sets the text font of the [`Radio`] button.
+    pub fn font(mut self, font: impl Into<Renderer::Font>) -> Self {
+        self.font = Some(font.into());
+        self
+    }
+
+    /// Sets the style of the [`Radio`] button.
+    pub fn style(
+        mut self,
+        style: impl Into<<Renderer::Theme as StyleSheet>::Style>,
+    ) -> Self {
+        self.style = style.into();
+        self
+    }
+}
+
+impl<Message, Renderer> Widget<Message, Renderer> for Radio<Message, Renderer>
+where
+    Message: Clone,
+    Renderer: text::Renderer,
+    Renderer::Theme: StyleSheet + crate::text::StyleSheet,
+{
+    fn width(&self) -> Length {
+        self.width
+    }
+
+    fn height(&self) -> Length {
+        Length::Shrink
+    }
+
+    fn layout(
+        &self,
+        renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        Row::<(), Renderer>::new()
+            .width(self.width)
+            .spacing(self.spacing)
+            .align_items(Alignment::Center)
+            .push(Row::new().width(self.size).height(self.size))
+            .push(Text::new(&self.label).width(self.width).size(
+                self.text_size.unwrap_or_else(|| renderer.default_size()),
+            ))
+            .layout(renderer, limits)
+    }
+
+    fn on_event(
+        &mut self,
+        _state: &mut Tree,
+        event: Event,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _renderer: &Renderer,
+        _clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, Message>,
+    ) -> event::Status {
+        match event {
+            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
+            | Event::Touch(touch::Event::FingerPressed { .. }) => {
+                if layout.bounds().contains(cursor_position) {
+                    shell.publish(self.on_click.clone());
+
+                    return event::Status::Captured;
+                }
+            }
+            _ => {}
+        }
+
+        event::Status::Ignored
+    }
+
+    fn mouse_interaction(
+        &self,
+        _state: &Tree,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _viewport: &Rectangle,
+        _renderer: &Renderer,
+    ) -> mouse::Interaction {
+        if layout.bounds().contains(cursor_position) {
+            mouse::Interaction::Pointer
+        } else {
+            mouse::Interaction::default()
+        }
+    }
+
+    fn draw(
+        &self,
+        _state: &Tree,
+        renderer: &mut Renderer,
+        theme: &Renderer::Theme,
+        style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _viewport: &Rectangle,
+    ) {
+        let bounds = layout.bounds();
+        let is_mouse_over = bounds.contains(cursor_position);
+
+        let mut children = layout.children();
+
+        let custom_style = if is_mouse_over {
+            theme.hovered(&self.style, self.is_selected)
+        } else {
+            theme.active(&self.style, self.is_selected)
+        };
+
+        {
+            let layout = children.next().unwrap();
+            let bounds = layout.bounds();
+
+            let size = bounds.width;
+            let dot_size = size / 2.0;
+
+            renderer.fill_quad(
+                renderer::Quad {
+                    bounds,
+                    border_radius: (size / 2.0).into(),
+                    border_width: custom_style.border_width,
+                    border_color: custom_style.border_color,
+                },
+                custom_style.background,
+            );
+
+            if self.is_selected {
+                renderer.fill_quad(
+                    renderer::Quad {
+                        bounds: Rectangle {
+                            x: bounds.x + dot_size / 2.0,
+                            y: bounds.y + dot_size / 2.0,
+                            width: bounds.width - dot_size,
+                            height: bounds.height - dot_size,
+                        },
+                        border_radius: (dot_size / 2.0).into(),
+                        border_width: 0.0,
+                        border_color: Color::TRANSPARENT,
+                    },
+                    custom_style.dot_color,
+                );
+            }
+        }
+
+        {
+            let label_layout = children.next().unwrap();
+
+            crate::text::draw(
+                renderer,
+                style,
+                label_layout,
+                &self.label,
+                self.text_size,
+                self.font,
+                crate::text::Appearance {
+                    color: custom_style.text_color,
+                },
+                alignment::Horizontal::Left,
+                alignment::Vertical::Center,
+            );
+        }
+    }
+}
+
+impl<'a, Message, Renderer> From<Radio<Message, Renderer>>
+    for Element<'a, Message, Renderer>
+where
+    Message: 'a + Clone,
+    Renderer: 'a + text::Renderer,
+    Renderer::Theme: StyleSheet + crate::text::StyleSheet,
+{
+    fn from(radio: Radio<Message, Renderer>) -> Element<'a, Message, Renderer> {
+        Element::new(radio)
+    }
+}