1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158

//! Display a horizontal or vertical rule for dividing content.
use crate::core::layout;
use crate::core::mouse;
use crate::core::renderer;
use crate::core::widget::Tree;
use crate::core::{
    Border, Element, Layout, Length, Pixels, Rectangle, Size, Widget,
};

pub use crate::style::rule::{Appearance, FillMode, StyleSheet};

/// Display a horizontal or vertical rule for dividing content.
#[allow(missing_debug_implementations)]
pub struct Rule<Theme = crate::Theme>
where
    Theme: StyleSheet,
{
    width: Length,
    height: Length,
    is_horizontal: bool,
    style: Theme::Style,
}

impl<Theme> Rule<Theme>
where
    Theme: StyleSheet,
{
    /// Creates a horizontal [`Rule`] with the given height.
    pub fn horizontal(height: impl Into<Pixels>) -> Self {
        Rule {
            width: Length::Fill,
            height: Length::Fixed(height.into().0),
            is_horizontal: true,
            style: Default::default(),
        }
    }

    /// Creates a vertical [`Rule`] with the given width.
    pub fn vertical(width: impl Into<Pixels>) -> Self {
        Rule {
            width: Length::Fixed(width.into().0),
            height: Length::Fill,
            is_horizontal: false,
            style: Default::default(),
        }
    }

    /// Set the width of the rule
    /// Will not be applied if it is vertical
    pub fn width(mut self, width: impl Into<Length>) -> Self {
        if self.is_horizontal {
            self.width = width.into();
        }
        self
    }

    /// Set the height of the rule
    /// Will not be applied if it is horizontal
    pub fn height(mut self, height: impl Into<Length>) -> Self {
        if !self.is_horizontal {
            self.height = height.into();
        }
        self
    }

    /// Sets the style of the [`Rule`].
    pub fn style(mut self, style: impl Into<Theme::Style>) -> Self {
        self.style = style.into();
        self
    }
}

impl<Message, Theme, Renderer> Widget<Message, Theme, Renderer> for Rule<Theme>
where
    Renderer: crate::core::Renderer,
    Theme: StyleSheet,
{
    fn size(&self) -> Size<Length> {
        Size {
            width: self.width,
            height: self.height,
        }
    }

    fn layout(
        &self,
        _tree: &mut Tree,
        _renderer: &Renderer,
        limits: &layout::Limits,
    ) -> layout::Node {
        layout::atomic(limits, self.width, self.height)
    }

    fn draw(
        &self,
        _state: &Tree,
        renderer: &mut Renderer,
        theme: &Theme,
        _style: &renderer::Style,
        layout: Layout<'_>,
        _cursor: mouse::Cursor,
        _viewport: &Rectangle,
    ) {
        let bounds = layout.bounds();
        let style = theme.appearance(&self.style);

        let bounds = if self.is_horizontal {
            let line_y = (bounds.y + (bounds.height / 2.0)
                - (style.width as f32 / 2.0))
                .round();

            let (offset, line_width) = style.fill_mode.fill(bounds.width);
            let line_x = bounds.x + offset;

            Rectangle {
                x: line_x,
                y: line_y,
                width: line_width,
                height: style.width as f32,
            }
        } else {
            let line_x = (bounds.x + (bounds.width / 2.0)
                - (style.width as f32 / 2.0))
                .round();

            let (offset, line_height) = style.fill_mode.fill(bounds.height);
            let line_y = bounds.y + offset;

            Rectangle {
                x: line_x,
                y: line_y,
                width: style.width as f32,
                height: line_height,
            }
        };

        renderer.fill_quad(
            renderer::Quad {
                bounds,
                border: Border::with_radius(style.radius),
                ..renderer::Quad::default()
            },
            style.color,
        );
    }
}

impl<'a, Message, Theme, Renderer> From<Rule<Theme>>
    for Element<'a, Message, Theme, Renderer>
where
    Message: 'a,
    Theme: StyleSheet + 'a,
    Renderer: 'a + crate::core::Renderer,
{
    fn from(rule: Rule<Theme>) -> Element<'a, Message, Theme, Renderer> {
        Element::new(rule)
    }
}