From a97401aed2a173260a4abfdb65a77975ce6c0f01 Mon Sep 17 00:00:00 2001
From: Héctor Ramón Jiménez <hector0193@gmail.com>
Date: Sat, 14 Sep 2019 19:16:06 +0200
Subject: Rethink workspace structure

---
 src/widget/checkbox.rs | 203 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100644 src/widget/checkbox.rs

(limited to 'src/widget/checkbox.rs')

diff --git a/src/widget/checkbox.rs b/src/widget/checkbox.rs
new file mode 100644
index 00000000..c60807fd
--- /dev/null
+++ b/src/widget/checkbox.rs
@@ -0,0 +1,203 @@
+//! Show toggle controls using checkboxes.
+use std::hash::Hash;
+
+use crate::input::{mouse, ButtonState};
+use crate::widget::{text, Column, Row, Text};
+use crate::{
+    Align, Element, Event, Hasher, Layout, MouseCursor, Node, Point, Rectangle,
+    Widget,
+};
+
+/// A box that can be checked, with a generic text `Color`.
+///
+/// It implements [`Widget`] when the associated `Renderer` implements the
+/// [`checkbox::Renderer`] trait.
+///
+/// [`Widget`]: ../trait.Widget.html
+/// [`checkbox::Renderer`]: trait.Renderer.html
+///
+/// # Example
+///
+/// ```
+/// use iced::Checkbox;
+///
+/// #[derive(Debug, Clone, Copy)]
+/// pub enum Color {
+///     Black,
+/// }
+///
+/// pub enum Message {
+///     CheckboxToggled(bool),
+/// }
+///
+/// let is_checked = true;
+///
+/// Checkbox::new(is_checked, "Toggle me!", Message::CheckboxToggled)
+///     .label_color(Color::Black);
+/// ```
+///
+/// ![Checkbox drawn by Coffee's renderer](https://github.com/hecrj/coffee/blob/bda9818f823dfcb8a7ad0ff4940b4d4b387b5208/images/ui/checkbox.png?raw=true)
+pub struct Checkbox<Color, Message> {
+    is_checked: bool,
+    on_toggle: Box<dyn Fn(bool) -> Message>,
+    label: String,
+    label_color: Option<Color>,
+}
+
+impl<Color, Message> std::fmt::Debug for Checkbox<Color, Message>
+where
+    Color: std::fmt::Debug,
+{
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Checkbox")
+            .field("is_checked", &self.is_checked)
+            .field("label", &self.label)
+            .field("label_color", &self.label_color)
+            .finish()
+    }
+}
+
+impl<Color, Message> Checkbox<Color, Message> {
+    /// 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`.
+    ///
+    /// [`Checkbox`]: struct.Checkbox.html
+    pub fn new<F>(is_checked: bool, label: &str, f: F) -> Self
+    where
+        F: 'static + Fn(bool) -> Message,
+    {
+        Checkbox {
+            is_checked,
+            on_toggle: Box::new(f),
+            label: String::from(label),
+            label_color: None,
+        }
+    }
+
+    /// Sets the `Color` of the label of the [`Checkbox`].
+    ///
+    /// [`Checkbox`]: struct.Checkbox.html
+    pub fn label_color(mut self, color: Color) -> Self {
+        self.label_color = Some(color);
+        self
+    }
+}
+
+impl<Color, Message, Renderer> Widget<Message, Renderer>
+    for Checkbox<Color, Message>
+where
+    Color: 'static + Copy + std::fmt::Debug,
+    Renderer: self::Renderer + text::Renderer<Color>,
+{
+    fn node(&self, renderer: &Renderer) -> Node {
+        Row::<(), Renderer>::new()
+            .spacing(15)
+            .align_items(Align::Center)
+            .push(Column::new().width(28).height(28))
+            .push(Text::new(&self.label))
+            .node(renderer)
+    }
+
+    fn on_event(
+        &mut self,
+        event: Event,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        messages: &mut Vec<Message>,
+    ) {
+        match event {
+            Event::Mouse(mouse::Event::Input {
+                button: mouse::Button::Left,
+                state: ButtonState::Pressed,
+            }) => {
+                let mouse_over = layout
+                    .children()
+                    .any(|child| child.bounds().contains(cursor_position));
+
+                if mouse_over {
+                    messages.push((self.on_toggle)(!self.is_checked));
+                }
+            }
+            _ => {}
+        }
+    }
+
+    fn draw(
+        &self,
+        renderer: &mut Renderer,
+        layout: Layout<'_>,
+        cursor_position: Point,
+    ) -> MouseCursor {
+        let children: Vec<_> = layout.children().collect();
+
+        let text_bounds = children[1].bounds();
+
+        text::Renderer::draw(
+            renderer,
+            text_bounds,
+            &self.label,
+            None,
+            self.label_color,
+            text::HorizontalAlignment::Left,
+            text::VerticalAlignment::Top,
+        );
+
+        self::Renderer::draw(
+            renderer,
+            cursor_position,
+            children[0].bounds(),
+            text_bounds,
+            self.is_checked,
+        )
+    }
+
+    fn hash_layout(&self, state: &mut Hasher) {
+        self.label.hash(state);
+    }
+}
+
+/// The renderer of a [`Checkbox`].
+///
+/// Your [renderer] will need to implement this trait before being
+/// able to use a [`Checkbox`] in your user interface.
+///
+/// [`Checkbox`]: struct.Checkbox.html
+/// [renderer]: ../../renderer/index.html
+pub trait Renderer {
+    /// Draws a [`Checkbox`].
+    ///
+    /// It receives:
+    ///   * the current cursor position
+    ///   * the bounds of the [`Checkbox`]
+    ///   * the bounds of the label of the [`Checkbox`]
+    ///   * whether the [`Checkbox`] is checked or not
+    ///
+    /// [`Checkbox`]: struct.Checkbox.html
+    fn draw(
+        &mut self,
+        cursor_position: Point,
+        bounds: Rectangle,
+        label_bounds: Rectangle,
+        is_checked: bool,
+    ) -> MouseCursor;
+}
+
+impl<'a, Color, Message, Renderer> From<Checkbox<Color, Message>>
+    for Element<'a, Message, Renderer>
+where
+    Color: 'static + Copy + std::fmt::Debug,
+    Renderer: self::Renderer + text::Renderer<Color>,
+    Message: 'static,
+{
+    fn from(
+        checkbox: Checkbox<Color, Message>,
+    ) -> Element<'a, Message, Renderer> {
+        Element::new(checkbox)
+    }
+}
-- 
cgit