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

1 files changed, 323 insertions, 0 deletions

diff --git a/widget/src/checkbox.rs b/widget/src/checkbox.rs
new file mode 100644
index 00000000..6a062f94
--- /dev/null
+++ b/widget/src/checkbox.rs
@@ -0,0 +1,323 @@
+//! Show toggle controls using checkboxes.
+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, Element, Layout, Length, Pixels, Point, Rectangle,
+    Shell, Widget,
+};
+use crate::{Row, Text};
+
+pub use iced_style::checkbox::{Appearance, StyleSheet};
+
+/// The icon in a [`Checkbox`].
+#[derive(Debug, Clone, PartialEq)]
+pub struct Icon<Font> {
+    /// Font that will be used to display the `code_point`,
+    pub font: Font,
+    /// The unicode code point that will be used as the icon.
+    pub code_point: char,
+    /// Font size of the content.
+    pub size: Option<f32>,
+}
+
+/// A box that can be checked.
+///
+/// # Example
+///
+/// ```
+/// # type Checkbox<'a, Message> =
+/// #     iced_widget::Checkbox<'a, Message, iced_widget::renderer::Renderer<iced_widget::style::Theme>>;
+/// #
+/// pub enum Message {
+///     CheckboxToggled(bool),
+/// }
+///
+/// let is_checked = true;
+///
+/// Checkbox::new("Toggle me!", is_checked, Message::CheckboxToggled);
+/// ```
+///
+/// ![Checkbox drawn by `iced_wgpu`](https://github.com/iced-rs/iced/blob/7760618fb112074bc40b148944521f312152012a/docs/images/checkbox.png?raw=true)
+#[allow(missing_debug_implementations)]
+pub struct Checkbox<'a, Message, Renderer = crate::Renderer>
+where
+    Renderer: text::Renderer,
+    Renderer::Theme: StyleSheet + crate::text::StyleSheet,
+{
+    is_checked: bool,
+    on_toggle: Box<dyn Fn(bool) -> Message + 'a>,
+    label: String,
+    width: Length,
+    size: f32,
+    spacing: f32,
+    text_size: Option<f32>,
+    font: Option<Renderer::Font>,
+    icon: Icon<Renderer::Font>,
+    style: <Renderer::Theme as StyleSheet>::Style,
+}
+
+impl<'a, Message, Renderer> Checkbox<'a, Message, Renderer>
+where
+    Renderer: text::Renderer,
+    Renderer::Theme: StyleSheet + crate::text::StyleSheet,
+{
+    /// The default size of a [`Checkbox`].
+    const DEFAULT_SIZE: f32 = 20.0;
+
+    /// The default spacing of a [`Checkbox`].
+    const DEFAULT_SPACING: f32 = 15.0;
+
+    /// Creates a new [`Checkbox`].
+    ///
+    /// It expects:
+    ///   * a boolean describing whether the [`Checkbox`] is checked or not
+    ///   * the label of the [`Checkbox`]
+    ///   * a function that will be called when the [`Checkbox`] is toggled. It
+    ///     will receive the new state of the [`Checkbox`] and must produce a
+    ///     `Message`.
+    pub fn new<F>(label: impl Into<String>, is_checked: bool, f: F) -> Self
+    where
+        F: 'a + Fn(bool) -> Message,
+    {
+        Checkbox {
+            is_checked,
+            on_toggle: Box::new(f),
+            label: label.into(),
+            width: Length::Shrink,
+            size: Self::DEFAULT_SIZE,
+            spacing: Self::DEFAULT_SPACING,
+            text_size: None,
+            font: None,
+            icon: Icon {
+                font: Renderer::ICON_FONT,
+                code_point: Renderer::CHECKMARK_ICON,
+                size: None,
+            },
+            style: Default::default(),
+        }
+    }
+
+    /// Sets the size of the [`Checkbox`].
+    pub fn size(mut self, size: impl Into<Pixels>) -> Self {
+        self.size = size.into().0;
+        self
+    }
+
+    /// Sets the width of the [`Checkbox`].
+    pub fn width(mut self, width: impl Into<Length>) -> Self {
+        self.width = width.into();
+        self
+    }
+
+    /// Sets the spacing between the [`Checkbox`] 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 [`Checkbox`].
+    pub fn text_size(mut self, text_size: impl Into<Pixels>) -> Self {
+        self.text_size = Some(text_size.into().0);
+        self
+    }
+
+    /// Sets the [`Font`] of the text of the [`Checkbox`].
+    ///
+    /// [`Font`]: crate::text::Renderer::Font
+    pub fn font(mut self, font: impl Into<Renderer::Font>) -> Self {
+        self.font = Some(font.into());
+        self
+    }
+
+    /// Sets the [`Icon`] of the [`Checkbox`].
+    pub fn icon(mut self, icon: Icon<Renderer::Font>) -> Self {
+        self.icon = icon;
+        self
+    }
+
+    /// Sets the style of the [`Checkbox`].
+    pub fn style(
+        mut self,
+        style: impl Into<<Renderer::Theme as StyleSheet>::Style>,
+    ) -> Self {
+        self.style = style.into();
+        self
+    }
+}
+
+impl<'a, Message, Renderer> Widget<Message, Renderer>
+    for Checkbox<'a, Message, Renderer>
+where
+    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)
+                    .font(self.font.unwrap_or_else(|| renderer.default_font()))
+                    .width(self.width)
+                    .size(
+                        self.text_size
+                            .unwrap_or_else(|| renderer.default_size()),
+                    ),
+            )
+            .layout(renderer, limits)
+    }
+
+    fn on_event(
+        &mut self,
+        _tree: &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 { .. }) => {
+                let mouse_over = layout.bounds().contains(cursor_position);
+
+                if mouse_over {
+                    shell.publish((self.on_toggle)(!self.is_checked));
+
+                    return event::Status::Captured;
+                }
+            }
+            _ => {}
+        }
+
+        event::Status::Ignored
+    }
+
+    fn mouse_interaction(
+        &self,
+        _tree: &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,
+        _tree: &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_checked)
+        } else {
+            theme.active(&self.style, self.is_checked)
+        };
+
+        {
+            let layout = children.next().unwrap();
+            let bounds = layout.bounds();
+
+            renderer.fill_quad(
+                renderer::Quad {
+                    bounds,
+                    border_radius: custom_style.border_radius.into(),
+                    border_width: custom_style.border_width,
+                    border_color: custom_style.border_color,
+                },
+                custom_style.background,
+            );
+
+            let Icon {
+                font,
+                code_point,
+                size,
+            } = &self.icon;
+            let size = size.unwrap_or(bounds.height * 0.7);
+
+            if self.is_checked {
+                renderer.fill_text(text::Text {
+                    content: &code_point.to_string(),
+                    font: *font,
+                    size,
+                    bounds: Rectangle {
+                        x: bounds.center_x(),
+                        y: bounds.center_y(),
+                        ..bounds
+                    },
+                    color: custom_style.icon_color,
+                    horizontal_alignment: alignment::Horizontal::Center,
+                    vertical_alignment: alignment::Vertical::Center,
+                });
+            }
+        }
+
+        {
+            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<Checkbox<'a, Message, Renderer>>
+    for Element<'a, Message, Renderer>
+where
+    Message: 'a,
+    Renderer: 'a + text::Renderer,
+    Renderer::Theme: StyleSheet + crate::text::StyleSheet,
+{
+    fn from(
+        checkbox: Checkbox<'a, Message, Renderer>,
+    ) -> Element<'a, Message, Renderer> {
+        Element::new(checkbox)
+    }
+}